2000-2010
2010 |
Erdoğan, E; Güçlüoğlu, T Space time coded cooperative communication with joint antenna and relay selection Journal Article 2010 IEEE 18th Signal Processing and Communications Applications Conference …, 2010. @article{pop00065, title = {Space time coded cooperative communication with joint antenna and relay selection}, author = {E Erdoğan and T Güçlüoğlu}, year = {2010}, date = {2010-01-01}, journal = {2010 IEEE 18th Signal Processing and Communications Applications Conference …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Gul, Ertan; Atakan, Baris; Akan, Ozgur B NanoNS: A nanoscale network simulator framework for molecular communications Journal Article Nano Communication Networks, 2010, ISSN: 18787789. @article{Gul2010, title = {NanoNS: A nanoscale network simulator framework for molecular communications}, author = {Ertan Gul and Baris Atakan and Ozgur B Akan}, doi = {10.1016/j.nancom.2010.08.003}, issn = {18787789}, year = {2010}, date = {2010-01-01}, journal = {Nano Communication Networks}, abstract = {A number of nanomachines that cooperatively communicate and share molecular information in order to achieve specific tasks is envisioned as a nanonetwork. Due to the size and capabilities of nanomachines, the traditional communication paradigms cannot be used for nanonetworks in which network nodes may be composed of just several atoms or molecules and scale on the orders of few nanometers. Instead, molecular communication is a promising solution approach for the nanoscale communication paradigm. However, molecular communication must be thoroughly investigated to realize nanoscale communication and nanonetworks for many envisioned applications such as nanoscale body area networks, and nanoscale molecular computers. In this paper, a simulation framework (NanoNS) for molecular nanonetworks is presented. The objective of the framework is to provide a simulation tool in order to create a better understanding of nanonetworks and facilitate the development of new communication techniques and the validation of theoretical results. The NanoNS framework is built on top of core components of a widely used network simulator (ns-2). It incorporates the simulation modules for various nanoscale communication paradigms based on a diffusive molecular communication channel. The details of NanoNS are discussed and some functional scenarios are defined to validate NanoNS. In addition to this, the numerical analyses of these functional scenarios and their experimental results are presented. The validation of NanoNS is shown via comparative evaluation of these experimental and numerical results. textcopyright 2010 Elsevier Ltd.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A number of nanomachines that cooperatively communicate and share molecular information in order to achieve specific tasks is envisioned as a nanonetwork. Due to the size and capabilities of nanomachines, the traditional communication paradigms cannot be used for nanonetworks in which network nodes may be composed of just several atoms or molecules and scale on the orders of few nanometers. Instead, molecular communication is a promising solution approach for the nanoscale communication paradigm. However, molecular communication must be thoroughly investigated to realize nanoscale communication and nanonetworks for many envisioned applications such as nanoscale body area networks, and nanoscale molecular computers. In this paper, a simulation framework (NanoNS) for molecular nanonetworks is presented. The objective of the framework is to provide a simulation tool in order to create a better understanding of nanonetworks and facilitate the development of new communication techniques and the validation of theoretical results. The NanoNS framework is built on top of core components of a widely used network simulator (ns-2). It incorporates the simulation modules for various nanoscale communication paradigms based on a diffusive molecular communication channel. The details of NanoNS are discussed and some functional scenarios are defined to validate NanoNS. In addition to this, the numerical analyses of these functional scenarios and their experimental results are presented. The validation of NanoNS is shown via comparative evaluation of these experimental and numerical results. textcopyright 2010 Elsevier Ltd. |
Atakan, Baris; Akan, Ozgur Carbon nanotube-based nanoscale ad hoc networks Journal Article IEEE Communications Magazine, 2010, ISSN: 01636804. @article{Atakan2010b, title = {Carbon nanotube-based nanoscale ad hoc networks}, author = {Baris Atakan and Ozgur Akan}, doi = {10.1109/MCOM.2010.5473874}, issn = {01636804}, year = {2010}, date = {2010-01-01}, journal = {IEEE Communications Magazine}, abstract = {Recent developments in nanoscale electronics allow current wireless technologies to function in nanoscale environments. Especially due to their incredible electrical and electromagnetic properties, carbon nanotubes are promising physical phenomenon that are used for the realization of a nanoscale communication paradigm. This provides a very large set of new promising applications such as collaborative disease detection with communicating in-vivo nanosensor nodes and distributed chemical attack detection with a network of nanorobots. Hence, one of the most challenging subjects for such applications becomes the realization of nanoscale ad hoc networks. In this article, we define the concept of carbon nanotube-based nanoscale ad hoc networks for future nanotechnology applications. Carbon nanotube-based nanoscale Ad hoc NETworks (CANETs) can be perceived as the down-scaled version of traditional wireless ad hoc networks without downgrading its main functionalities. The objective of this work is to introduce this novel and interdisciplinary research field and highlight major barriers toward its realization.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Recent developments in nanoscale electronics allow current wireless technologies to function in nanoscale environments. Especially due to their incredible electrical and electromagnetic properties, carbon nanotubes are promising physical phenomenon that are used for the realization of a nanoscale communication paradigm. This provides a very large set of new promising applications such as collaborative disease detection with communicating in-vivo nanosensor nodes and distributed chemical attack detection with a network of nanorobots. Hence, one of the most challenging subjects for such applications becomes the realization of nanoscale ad hoc networks. In this article, we define the concept of carbon nanotube-based nanoscale ad hoc networks for future nanotechnology applications. Carbon nanotube-based nanoscale Ad hoc NETworks (CANETs) can be perceived as the down-scaled version of traditional wireless ad hoc networks without downgrading its main functionalities. The objective of this work is to introduce this novel and interdisciplinary research field and highlight major barriers toward its realization. |
Atakan, B; Gulbahar, B; Akan, OB Immune system-inspired evolutionary opportunistic spectrum access in cognitive radio ad hoc networks Journal Article 2010 The 9th IFIP Annual Mediterranean Ad Hoc Networking Workshop (Med-Hoc …, 2010. @article{pop00021bb, title = {Immune system-inspired evolutionary opportunistic spectrum access in cognitive radio ad hoc networks}, author = {B Atakan and B Gulbahar and OB Akan}, year = {2010}, date = {2010-01-01}, journal = {2010 The 9th IFIP Annual Mediterranean Ad Hoc Networking Workshop (Med-Hoc …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Guney, A; Atakan, B; Akan, OB Mobile Ad Hoc Molecular Nanonetworks Journal Article MS thesis, Middle East Technical University, 2010. @article{pop00031b, title = {Mobile Ad Hoc Molecular Nanonetworks}, author = {A Guney and B Atakan and OB Akan}, year = {2010}, date = {2010-01-01}, journal = {MS thesis, Middle East Technical University}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yaman, Fatih A combination of shape and conductivity function reconstruction methods for an inverse boundary value problem Journal Article Wave Motion, 2010, ISSN: 01652125. @article{Yaman2010d, title = {A combination of shape and conductivity function reconstruction methods for an inverse boundary value problem}, author = {Fatih Yaman}, doi = {10.1016/j.wavemoti.2009.10.004}, issn = {01652125}, year = {2010}, date = {2010-01-01}, journal = {Wave Motion}, abstract = {In this paper, an integral equation based method for the reconstruction of two-dimensional shape of a buried sound-soft obstacle and a real valued conductivity function defined over the exterior cylinder is presented. The direct problem considered here is to compute the scattered near/far field, for given shapes, wave numbers and conductivity function in the case of a single time-harmonic acoustic plane wave insonification. The aim of the inverse problem is to find the shape of the buried sound-soft obstacle as well as the conductivity function from the knowledge of the near/far field for given shape of the homogenous outer cylinder. In order to avoid an inverse crime different Potential approaches are used to derive a system of boundary integral equations and they are evaluated by using Nyström method numerically. To get stable solutions for the first kind of integral equations Tikhonov regularization is applied. Finally, numerical results are presented out to test the applicability and the effectiveness of the method. textcopyright 2009 Elsevier B.V. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this paper, an integral equation based method for the reconstruction of two-dimensional shape of a buried sound-soft obstacle and a real valued conductivity function defined over the exterior cylinder is presented. The direct problem considered here is to compute the scattered near/far field, for given shapes, wave numbers and conductivity function in the case of a single time-harmonic acoustic plane wave insonification. The aim of the inverse problem is to find the shape of the buried sound-soft obstacle as well as the conductivity function from the knowledge of the near/far field for given shape of the homogenous outer cylinder. In order to avoid an inverse crime different Potential approaches are used to derive a system of boundary integral equations and they are evaluated by using Nyström method numerically. To get stable solutions for the first kind of integral equations Tikhonov regularization is applied. Finally, numerical results are presented out to test the applicability and the effectiveness of the method. textcopyright 2009 Elsevier B.V. All rights reserved. |
Atakan, Baris; Akan, Ozgur B Deterministic capacity of information flow in molecular nanonetworks Journal Article Nano Communication Networks, 2010, ISSN: 18787789. @article{Atakan2010ab, title = {Deterministic capacity of information flow in molecular nanonetworks}, author = {Baris Atakan and Ozgur B Akan}, doi = {10.1016/j.nancom.2010.03.003}, issn = {18787789}, year = {2010}, date = {2010-01-01}, journal = {Nano Communication Networks}, abstract = {Molecular communication enables nanomachines to exchange information with each other by emitting molecules to their surrounding environment. Molecular nanonetworks are envisioned as a number of nanomachines that are deployed in an environment to share specific molecular information such as odor, flavor, or any chemical state. In this paper, using the stochastic model of molecular reactions in biochemical systems, a realistic channel model is first introduced for molecular communication. Then, based on the realistic channel model, we introduce a deterministic capacity expression for point-to-point, broadcast, and multiple-access molecular channels. We also investigate information flow capacity in a molecular nanonetwork for the realization of efficient communication and networking techniques for frontier nanonetwork applications. The results reveal that molecular point-to-point, broadcast, and multiple-access channels are feasible with a satisfactorily high molecular communication rate, which allows molecular information flow in nanonetworks. Furthermore, the derived molecular channel model with input-dependent noise term also reveals that unlike a traditional Gaussian communication channel, achievable capacity is affected by both lower and upper bounds of the channel input in molecular communication channels. textcopyright 2010 Elsevier Ltd. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Molecular communication enables nanomachines to exchange information with each other by emitting molecules to their surrounding environment. Molecular nanonetworks are envisioned as a number of nanomachines that are deployed in an environment to share specific molecular information such as odor, flavor, or any chemical state. In this paper, using the stochastic model of molecular reactions in biochemical systems, a realistic channel model is first introduced for molecular communication. Then, based on the realistic channel model, we introduce a deterministic capacity expression for point-to-point, broadcast, and multiple-access molecular channels. We also investigate information flow capacity in a molecular nanonetwork for the realization of efficient communication and networking techniques for frontier nanonetwork applications. The results reveal that molecular point-to-point, broadcast, and multiple-access channels are feasible with a satisfactorily high molecular communication rate, which allows molecular information flow in nanonetworks. Furthermore, the derived molecular channel model with input-dependent noise term also reveals that unlike a traditional Gaussian communication channel, achievable capacity is affected by both lower and upper bounds of the channel input in molecular communication channels. textcopyright 2010 Elsevier Ltd. All rights reserved. |
Özbek, Berna; Ruyet, Didier Le Adaptive limited feedback for intercell interference cancelation in cooperative downlink multicell networks Inproceedings Proceedings of the 2010 7th International Symposium on Wireless Communication Systems, ISWCS'10, 2010, ISBN: 9781424463169. @inproceedings{Ozbek2010a, title = {Adaptive limited feedback for intercell interference cancelation in cooperative downlink multicell networks}, author = {Berna Özbek and Didier Le Ruyet}, doi = {10.1109/ISWCS.2010.5624536}, isbn = {9781424463169}, year = {2010}, date = {2010-01-01}, booktitle = {Proceedings of the 2010 7th International Symposium on Wireless Communication Systems, ISWCS'10}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Ruyet, Le D; Özbek, B Resource management techniques for OFDMA Journal Article Orthogonal Frequency Division Multiple Access Fundamentals and Applications …, 2010. @article{pop00020d, title = {Resource management techniques for OFDMA}, author = {Le D Ruyet and B Özbek}, year = {2010}, date = {2010-01-01}, journal = {Orthogonal Frequency Division Multiple Access Fundamentals and Applications …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ruyet, Didier; Özbek, Berna Resource Management Techniques for OFDMA Incollection 2010. @incollection{Ruyet2010, title = {Resource Management Techniques for OFDMA}, author = {Didier Ruyet and Berna Özbek}, doi = {10.1201/9781420088250-c5}, year = {2010}, date = {2010-01-01}, keywords = {}, pubstate = {published}, tppubtype = {incollection} } |
Yüksel, K; Wuilpart, M; Moeyaert, V; Mégret, P Novel monitoring technique for passive optical networks based on optical frequency domain reflectometry and fiber Bragg gratings Journal Article Journal of optical communications and networking, 2 (7), pp. 463–468, 2010. @article{pop00004bb, title = {Novel monitoring technique for passive optical networks based on optical frequency domain reflectometry and fiber Bragg gratings}, author = {K Yüksel and M Wuilpart and V Moeyaert and P Mégret}, year = {2010}, date = {2010-01-01}, journal = {Journal of optical communications and networking}, volume = {2}, number = {7}, pages = {463--468}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yuksel, Kivilcim; Wuilpart, Marc; Moeyaert, Véronique; Mégret, Patrice Original monitoring technique for passive optical networks combining fiber Bragg gratings and wavelength swept light source Inproceedings 2010 12th International Conference on Transparent Optical Networks, ICTON 2010, 2010, ISBN: 9781424477975. @inproceedings{Yuksel2010a, title = {Original monitoring technique for passive optical networks combining fiber Bragg gratings and wavelength swept light source}, author = {Kivilcim Yuksel and Marc Wuilpart and Véronique Moeyaert and Patrice Mégret}, doi = {10.1109/ICTON.2010.5549288}, isbn = {9781424477975}, year = {2010}, date = {2010-01-01}, booktitle = {2010 12th International Conference on Transparent Optical Networks, ICTON 2010}, abstract = {An efficient monitoring method having a very short measurement time (a few seconds) is proposed. The equal-length branches can be effectively monitored, but also the information of temperature at any place in the network can be obtained. The feasibility of this technique is experimentally demonstrated. textcopyright 2010 IEEE.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } An efficient monitoring method having a very short measurement time (a few seconds) is proposed. The equal-length branches can be effectively monitored, but also the information of temperature at any place in the network can be obtained. The feasibility of this technique is experimentally demonstrated. textcopyright 2010 IEEE. |
Yuksel, K; Wuilpart, M; Mégret, P Analysis of Multi-Reflection Crosstalk for a Quasi-Distributed Fiber Sensor Interrogated by Coherent-Optical Frequency Domain Reflectometer (C-OFDR) Journal Article Optical Sensors, JThA, 5 , 2010. @article{pop00050b, title = {Analysis of Multi-Reflection Crosstalk for a Quasi-Distributed Fiber Sensor Interrogated by Coherent-Optical Frequency Domain Reflectometer (C-OFDR)}, author = {K Yuksel and M Wuilpart and P Mégret}, year = {2010}, date = {2010-01-01}, journal = {Optical Sensors, JThA}, volume = {5}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yüksel, K; Wuilpart, M; Mégret, P Multi-reflection Crosstalk Analysis for a Quasi-distributed Fiber Sensor Combining Fibre Bragg Gratings (FBG) and Optical Frequency-domain Reflectometry (OFDR) Journal Article Proceedings of the IEEE Photonics Society Annual Workshop, 2010. @article{pop00051c, title = {Multi-reflection Crosstalk Analysis for a Quasi-distributed Fiber Sensor Combining Fibre Bragg Gratings (FBG) and Optical Frequency-domain Reflectometry (OFDR)}, author = {K Yüksel and M Wuilpart and P Mégret}, year = {2010}, date = {2010-01-01}, journal = {Proceedings of the IEEE Photonics Society Annual Workshop}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Karacali, Bilge Quasi-supervised learning for biomedical data analysis Journal Article Pattern Recognition, 2010, ISSN: 00313203. @article{Karacali2010, title = {Quasi-supervised learning for biomedical data analysis}, author = {Bilge Karacali}, doi = {10.1016/j.patcog.2010.04.024}, issn = {00313203}, year = {2010}, date = {2010-01-01}, journal = {Pattern Recognition}, abstract = {We present a novel formulation for pattern recognition in biomedical data. We adopt a binary recognition scenario where a control dataset contains samples of one class only, while a mixed dataset contains an unlabeled collection of samples from both classes. The mixed dataset samples that belong to the second class are identified by estimating posterior probabilities of samples for being in the control or the mixed datasets. Experiments on synthetic data established a better detection performance against possible alternatives. The fitness of the method in biomedical data analysis was further demonstrated on real multi-color flow cytometry and multi-channel electroencephalography data. textcopyright 2010 Elsevier Ltd. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We present a novel formulation for pattern recognition in biomedical data. We adopt a binary recognition scenario where a control dataset contains samples of one class only, while a mixed dataset contains an unlabeled collection of samples from both classes. The mixed dataset samples that belong to the second class are identified by estimating posterior probabilities of samples for being in the control or the mixed datasets. Experiments on synthetic data established a better detection performance against possible alternatives. The fitness of the method in biomedical data analysis was further demonstrated on real multi-color flow cytometry and multi-channel electroencephalography data. textcopyright 2010 Elsevier Ltd. All rights reserved. |
Karacalı, Bilge; Davatzikos, Christos Topology Preservation and Regularity in Estimated Deformation Fields Incollection 2010. @incollection{Karacal2010, title = {Topology Preservation and Regularity in Estimated Deformation Fields}, author = {Bilge Karacalı and Christos Davatzikos}, doi = {10.1007/978-3-540-45087-0_36}, year = {2010}, date = {2010-01-01}, abstract = {A general formalism to impose topology preserving regularity on a given irregular deformation field is presented. The topology preservation conditions are derived with regard to the discrete approximations to the deformation field Jacobian in a two-dimensional image registration problem. The problem of enforcing topology preservation onto a given deformation field is formulated in terms of the deformation gradients, and solved using a cyclic projections approach. The generalization of the developed algorithm leads to a deformation field regularity control by limiting the per voxel volumetric change within a prescribed interval. Extension of the topology preservation conditions onto a three-dimensional registration problem is also presented, together with a comparative analysis of the proposed algorithm with respect to a Gaussian regularizer that enforces the same topology preservation conditions.}, keywords = {}, pubstate = {published}, tppubtype = {incollection} } A general formalism to impose topology preserving regularity on a given irregular deformation field is presented. The topology preservation conditions are derived with regard to the discrete approximations to the deformation field Jacobian in a two-dimensional image registration problem. The problem of enforcing topology preservation onto a given deformation field is formulated in terms of the deformation gradients, and solved using a cyclic projections approach. The generalization of the developed algorithm leads to a deformation field regularity control by limiting the per voxel volumetric change within a prescribed interval. Extension of the topology preservation conditions onto a three-dimensional registration problem is also presented, together with a comparative analysis of the proposed algorithm with respect to a Gaussian regularizer that enforces the same topology preservation conditions. |
Gumus, Abdurrahman; Califano, Joseph P; Wan, Alwin M D; Huynh, John; Reinhart-King, Cynthia A; Malliaras, George G Control of cell migration using a conducting polymer device Journal Article Soft Matter, 2010, ISSN: 1744683X. @article{Gumus2010, title = {Control of cell migration using a conducting polymer device}, author = {Abdurrahman Gumus and Joseph P Califano and Alwin M D Wan and John Huynh and Cynthia A Reinhart-King and George G Malliaras}, doi = {10.1039/b923064e}, issn = {1744683X}, year = {2010}, date = {2010-01-01}, journal = {Soft Matter}, abstract = {Control of cell migration is receiving a great deal of attention due to its relevance to the engineering of tissues. Here we report a device that contains a conducting polymer stripe and achieves a continuum of microenvironments for cell growth under the influence of an applied bias. Marked differences are observed in the migration behaviour of bovine aortic endothelial cells (ECs) as a function of location along the polymer stripe, and a 3-fold variation is achieved in EC migration speed and directional persistence time. Moreover, the device induces directional cell migration along the conducting polymer stripe. A gradient in adsorbed fibronectin indicates that a spatial variation in cell adhesion is at play. The ability to control cell migration behaviour using external electrical stimuli highlights the potential of using conducting polymers as "active" substrates for the non-invasive control of cell behaviour. textcopyright 2010 The Royal Society of Chemistry.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Control of cell migration is receiving a great deal of attention due to its relevance to the engineering of tissues. Here we report a device that contains a conducting polymer stripe and achieves a continuum of microenvironments for cell growth under the influence of an applied bias. Marked differences are observed in the migration behaviour of bovine aortic endothelial cells (ECs) as a function of location along the polymer stripe, and a 3-fold variation is achieved in EC migration speed and directional persistence time. Moreover, the device induces directional cell migration along the conducting polymer stripe. A gradient in adsorbed fibronectin indicates that a spatial variation in cell adhesion is at play. The ability to control cell migration behaviour using external electrical stimuli highlights the potential of using conducting polymers as "active" substrates for the non-invasive control of cell behaviour. textcopyright 2010 The Royal Society of Chemistry. |
Akin, Osman; Dinleyici, Mehmet Salih An all-optical switching based on resonance breaking with a transient grating Journal Article Journal of Lightwave Technology, 2010, ISSN: 07338724. @article{Akin2010, title = {An all-optical switching based on resonance breaking with a transient grating}, author = {Osman Akin and Mehmet Salih Dinleyici}, doi = {10.1109/JLT.2010.2089599}, issn = {07338724}, year = {2010}, date = {2010-01-01}, journal = {Journal of Lightwave Technology}, abstract = {A new resonance breaking in-fiber switch as an all-optical network component is investigated and presented. A transient grating is applied to break the transverse resonance of the fundamental waveguide mode and the power coupled into the higher order propagating mode is computed using coupled mode theory (CMT). The coupling of the modes with the grating forming beams in the evanescent region of the waveguide is investigated with four wave mixing (FWM). High conversion efficiency is calculated in the case of perfect phase matching at communication wavelength 1550 nm. The conversion efficiency of the proposed structure is considered in terms of third-order nonlinear susceptibility, and the effect of design and tuning parameters are investigated for grating forming geometry and laser beam intensity, respectively.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A new resonance breaking in-fiber switch as an all-optical network component is investigated and presented. A transient grating is applied to break the transverse resonance of the fundamental waveguide mode and the power coupled into the higher order propagating mode is computed using coupled mode theory (CMT). The coupling of the modes with the grating forming beams in the evanescent region of the waveguide is investigated with four wave mixing (FWM). High conversion efficiency is calculated in the case of perfect phase matching at communication wavelength 1550 nm. The conversion efficiency of the proposed structure is considered in terms of third-order nonlinear susceptibility, and the effect of design and tuning parameters are investigated for grating forming geometry and laser beam intensity, respectively. |
Onder, Devrim; Sarioglu, Sulen; Karacali, Bilge Automated classification of cancerous textures in histology images using quasi-supervised learning algorithm Inproceedings 2010. @inproceedings{Onder2010, title = {Automated classification of cancerous textures in histology images using quasi-supervised learning algorithm}, author = {Devrim Onder and Sulen Sarioglu and Bilge Karacali}, doi = {10.1109/biyomut.2010.5479863}, year = {2010}, date = {2010-01-01}, abstract = {The aim of this work is to perform automated texture classification of histology slide images in health and cancerous conditions using quasi-supervised statistical learning method. Tissue images were acquired from histological slides of human colon and were separated into two groups in terms of normal and disease conditions. Texture feature vectors corresponding to tissue segments of each image were calculated using co-occurrence matrices. Different texture regions were determined by the quasi-supervised statistical learning method using texture features of normal and cancerous groups.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } The aim of this work is to perform automated texture classification of histology slide images in health and cancerous conditions using quasi-supervised statistical learning method. Tissue images were acquired from histological slides of human colon and were separated into two groups in terms of normal and disease conditions. Texture feature vectors corresponding to tissue segments of each image were calculated using co-occurrence matrices. Different texture regions were determined by the quasi-supervised statistical learning method using texture features of normal and cancerous groups. |
Karacali, Bilge Deformation field interpolation using rotational landmarks Inproceedings 2010. @inproceedings{Karacali2010a, title = {Deformation field interpolation using rotational landmarks}, author = {Bilge Karacali}, doi = {10.1109/biyomut.2010.5479857}, year = {2010}, date = {2010-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Cek, Emre M; Ozgoren, Murat; Savaci, Acar F Continuous time wavelet entropy of auditory evoked potentials Journal Article Computers in Biology and Medicine, 2010, ISSN: 00104825. @article{EmreCek2010, title = {Continuous time wavelet entropy of auditory evoked potentials}, author = {Emre M Cek and Murat Ozgoren and Acar F Savaci}, doi = {10.1016/j.compbiomed.2009.11.005}, issn = {00104825}, year = {2010}, date = {2010-01-01}, journal = {Computers in Biology and Medicine}, abstract = {In this paper, the continuous time wavelet entropy (CTWE) of auditory evoked potentials (AEP) has been characterized by evaluating the relative wavelet energies (RWE) in specified EEG frequency bands. Thus, the rapid variations of CTWE due to the auditory stimulation could be detected in post-stimulus time interval. This approach removes the probability of missing the information hidden in short time intervals. The discrete time and continuous time wavelet based wavelet entropy variations were compared on non-target and target AEP data. It was observed that CTWE can also be an alternative method to analyze entropy as a function of time. textcopyright 2009 Elsevier Ltd. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this paper, the continuous time wavelet entropy (CTWE) of auditory evoked potentials (AEP) has been characterized by evaluating the relative wavelet energies (RWE) in specified EEG frequency bands. Thus, the rapid variations of CTWE due to the auditory stimulation could be detected in post-stimulus time interval. This approach removes the probability of missing the information hidden in short time intervals. The discrete time and continuous time wavelet based wavelet entropy variations were compared on non-target and target AEP data. It was observed that CTWE can also be an alternative method to analyze entropy as a function of time. textcopyright 2009 Elsevier Ltd. All rights reserved. |
Akin, Osman; Dinleyici, Salih M In fiber resonance breaking mechanism Inproceedings 2010 10th Mediterranean Microwave Symposium, MMS 2010, 2010, ISBN: 9781424472437. @inproceedings{Akin2010a, title = {In fiber resonance breaking mechanism}, author = {Osman Akin and Salih M Dinleyici}, doi = {10.1109/MMW.2010.5605182}, isbn = {9781424472437}, year = {2010}, date = {2010-01-01}, booktitle = {2010 10th Mediterranean Microwave Symposium, MMS 2010}, abstract = {In this work we investigate mode resonance breaking mechanism in slab waveguide accomplished by cladding index modulation according to Kerr nonlinearity. The interaction is considered to be a Four Wave Mixing Process and Coupled Mode Theory is used to analyze the effect of cladding perturbation into propagating fundamental mode.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } In this work we investigate mode resonance breaking mechanism in slab waveguide accomplished by cladding index modulation according to Kerr nonlinearity. The interaction is considered to be a Four Wave Mixing Process and Coupled Mode Theory is used to analyze the effect of cladding perturbation into propagating fundamental mode. |
Akin, Osman; Dinleyici, Salih M In fiber resonance breaking mechanism Inproceedings 2010 10th Mediterranean Microwave Symposium, MMS 2010, 2010, ISBN: 9781424472437. @inproceedings{Akin2010ab, title = {In fiber resonance breaking mechanism}, author = {Osman Akin and Salih M Dinleyici}, doi = {10.1109/MMW.2010.5605182}, isbn = {9781424472437}, year = {2010}, date = {2010-01-01}, booktitle = {2010 10th Mediterranean Microwave Symposium, MMS 2010}, abstract = {In this work we investigate mode resonance breaking mechanism in slab waveguide accomplished by cladding index modulation according to Kerr nonlinearity. The interaction is considered to be a Four Wave Mixing Process and Coupled Mode Theory is used to analyze the effect of cladding perturbation into propagating fundamental mode.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } In this work we investigate mode resonance breaking mechanism in slab waveguide accomplished by cladding index modulation according to Kerr nonlinearity. The interaction is considered to be a Four Wave Mixing Process and Coupled Mode Theory is used to analyze the effect of cladding perturbation into propagating fundamental mode. |
Kapadia, AD; Walker, ID; Dawson, DM; Tatlicioglu, E A model-based sliding mode controller for extensible continuum robots Journal Article Proceedings of the 9th WSEAS international conference on Signal processing …, 2010. @article{pop00005cb, title = {A model-based sliding mode controller for extensible continuum robots}, author = {AD Kapadia and ID Walker and DM Dawson and E Tatlicioglu}, year = {2010}, date = {2010-01-01}, journal = {Proceedings of the 9th WSEAS international conference on Signal processing …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Salah, MH; McIntyre, ML; Dawson, DM; Wagner, JR; Tatlicioglu, E Sensing of the time-varying angular rate for MEMS Z-axis gyroscopes Journal Article Mechatronics, 20 (6), pp. 720–727, 2010. @article{pop00009d, title = {Sensing of the time-varying angular rate for MEMS Z-axis gyroscopes}, author = {MH Salah and ML McIntyre and DM Dawson and JR Wagner and E Tatlicioglu}, year = {2010}, date = {2010-01-01}, journal = {Mechatronics}, volume = {20}, number = {6}, pages = {720--727}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Iyasere, E; Tatlicioglu, E; Dawson, DM Backstepping PWM control for maximum power tracking in photovoltaic array systems Journal Article Proceedings of the 2010 American Control Conference, pp. 3561–3565, 2010. @article{pop00010jb, title = {Backstepping PWM control for maximum power tracking in photovoltaic array systems}, author = {E Iyasere and E Tatlicioglu and DM Dawson}, year = {2010}, date = {2010-01-01}, journal = {Proceedings of the 2010 American Control Conference}, pages = {3561--3565}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ozan, Ş; Gümüştekin, Ş Efficient representation of measured brdf data using lafortune model Journal Article 2010 IEEE 18th Signal Processing and Communications Applications Conference …, 2010. @article{pop00013f, title = {Efficient representation of measured brdf data using lafortune model}, author = {Ş Ozan and Ş Gümüştekin}, year = {2010}, date = {2010-01-01}, journal = {2010 IEEE 18th Signal Processing and Communications Applications Conference …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Nath, Nitendra; Tatlicioglu, Enver; Dawson, Darren M Range identification for nonlinear parameterizable paracatadioptric systems Journal Article Automatica, 2010, ISSN: 00051098. @article{Nath2010, title = {Range identification for nonlinear parameterizable paracatadioptric systems}, author = {Nitendra Nath and Enver Tatlicioglu and Darren M Dawson}, doi = {10.1016/j.automatica.2010.03.017}, issn = {00051098}, year = {2010}, date = {2010-01-01}, journal = {Automatica}, abstract = {In this paper, a new range identification technique for a calibrated paracatadioptric system mounted on a moving platform is developed to recover the range information and the three-dimensional (3D) Euclidean coordinates of a static object feature. The position of the moving platform is assumed to be measurable. To identify the unknown range, first, a function of the projected pixel coordinates is related to the unknown 3D Euclidean coordinates of an object feature. This function is nonlinearly parameterized (i.e., the unknown parameters appear nonlinearly in the parameterized model). An adaptive estimator based on a minmax algorithm is then designed to estimate the unknown 3D Euclidean coordinates of an object feature relative to a fixed reference frame which facilitates the identification of range. A Lyapunov-type stability analysis is used to show that the developed estimator provides an estimation of the unknown parameters within a desired precision. Numerical simulation results are presented to illustrate the effectiveness of the proposed range estimation technique. textcopyright 2010 Elsevier Ltd. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this paper, a new range identification technique for a calibrated paracatadioptric system mounted on a moving platform is developed to recover the range information and the three-dimensional (3D) Euclidean coordinates of a static object feature. The position of the moving platform is assumed to be measurable. To identify the unknown range, first, a function of the projected pixel coordinates is related to the unknown 3D Euclidean coordinates of an object feature. This function is nonlinearly parameterized (i.e., the unknown parameters appear nonlinearly in the parameterized model). An adaptive estimator based on a minmax algorithm is then designed to estimate the unknown 3D Euclidean coordinates of an object feature relative to a fixed reference frame which facilitates the identification of range. A Lyapunov-type stability analysis is used to show that the developed estimator provides an estimation of the unknown parameters within a desired precision. Numerical simulation results are presented to illustrate the effectiveness of the proposed range estimation technique. textcopyright 2010 Elsevier Ltd. All rights reserved. |
Zergeroglu, E; Tatlicioglu, E Observer based output feedback tracking control of robot manipulators Journal Article 2010 IEEE International Conference on Control Applications, pp. 602–607, 2010. @article{pop00031c, title = {Observer based output feedback tracking control of robot manipulators}, author = {E Zergeroglu and E Tatlicioglu}, year = {2010}, date = {2010-01-01}, journal = {2010 IEEE International Conference on Control Applications}, pages = {602--607}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Unlu, MZ; Król, A; Magri, A; Mandel, JA; Lee, W; Baum, KG; Lipson, ED; ..., Computerized method for nonrigid MR-to-PET breast-image registration Journal Article Computers in biology and medicine, 40 (1), pp. 37–53, 2010. @article{pop00002bb, title = {Computerized method for nonrigid MR-to-PET breast-image registration}, author = {MZ Unlu and A Król and A Magri and JA Mandel and W Lee and KG Baum and ED Lipson and ...}, year = {2010}, date = {2010-01-01}, journal = {Computers in biology and medicine}, volume = {40}, number = {1}, pages = {37--53}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Tatlicioglu, E Adaptive control of non-linear teleoperator systems in the presence of additive input and output disturbances Journal Article International Journal of Robotics & Automation, 25 (1), pp. 17–17, 2010. @article{pop00042c, title = {Adaptive control of non-linear teleoperator systems in the presence of additive input and output disturbances}, author = {E Tatlicioglu}, year = {2010}, date = {2010-01-01}, journal = {International Journal of Robotics & Automation}, volume = {25}, number = {1}, pages = {17--17}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Zergeroglu, Erkan; Tatlicioglu, Enver Observer based adaptive output feedback tracking control of robot manipulators Inproceedings Proceedings of the IEEE Conference on Decision and Control, 2010, ISSN: 01912216. @inproceedings{Zergeroglu2010, title = {Observer based adaptive output feedback tracking control of robot manipulators}, author = {Erkan Zergeroglu and Enver Tatlicioglu}, doi = {10.1109/CDC.2010.5716953}, issn = {01912216}, year = {2010}, date = {2010-01-01}, booktitle = {Proceedings of the IEEE Conference on Decision and Control}, abstract = {This paper presents a solution to the problem of global, output feedback, tracking control of uncertain robot manipulators. Specifically, a desired compensation adaptation law plus a nonlinear feedback term coupled to a dynamic nonlinear filter is designed to produce global asymptotic link position tracking errors while compensating for parametric uncertainty and requiring only link position measurements. Simulation results are provided to illustrate the controller performance.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } This paper presents a solution to the problem of global, output feedback, tracking control of uncertain robot manipulators. Specifically, a desired compensation adaptation law plus a nonlinear feedback term coupled to a dynamic nonlinear filter is designed to produce global asymptotic link position tracking errors while compensating for parametric uncertainty and requiring only link position measurements. Simulation results are provided to illustrate the controller performance. |
Salah, MH; Alwidyan, KM; Tatlicioglu, E; Dawson, DM Robust backstepping nonlinear control for parallel-plate micro electrostatic actuators Journal Article Proc. of the 49th IEEE Conference on Decision and Control, Atlanta, Georgia, USA, 2010. @article{pop00061b, title = {Robust backstepping nonlinear control for parallel-plate micro electrostatic actuators}, author = {MH Salah and KM Alwidyan and E Tatlicioglu and DM Dawson}, year = {2010}, date = {2010-01-01}, journal = {Proc. of the 49th IEEE Conference on Decision and Control, Atlanta, Georgia, USA}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Atakan, Baris; Akan, Ozgur B Deterministic capacity of information flow in molecular nanonetworks Journal Article Nano Communication Networks, 2010, ISSN: 18787789. @article{Atakan2010abb, title = {Deterministic capacity of information flow in molecular nanonetworks}, author = {Baris Atakan and Ozgur B Akan}, doi = {10.1016/j.nancom.2010.03.003}, issn = {18787789}, year = {2010}, date = {2010-01-01}, journal = {Nano Communication Networks}, abstract = {Molecular communication enables nanomachines to exchange information with each other by emitting molecules to their surrounding environment. Molecular nanonetworks are envisioned as a number of nanomachines that are deployed in an environment to share specific molecular information such as odor, flavor, or any chemical state. In this paper, using the stochastic model of molecular reactions in biochemical systems, a realistic channel model is first introduced for molecular communication. Then, based on the realistic channel model, we introduce a deterministic capacity expression for point-to-point, broadcast, and multiple-access molecular channels. We also investigate information flow capacity in a molecular nanonetwork for the realization of efficient communication and networking techniques for frontier nanonetwork applications. The results reveal that molecular point-to-point, broadcast, and multiple-access channels are feasible with a satisfactorily high molecular communication rate, which allows molecular information flow in nanonetworks. Furthermore, the derived molecular channel model with input-dependent noise term also reveals that unlike a traditional Gaussian communication channel, achievable capacity is affected by both lower and upper bounds of the channel input in molecular communication channels. textcopyright 2010 Elsevier Ltd. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Molecular communication enables nanomachines to exchange information with each other by emitting molecules to their surrounding environment. Molecular nanonetworks are envisioned as a number of nanomachines that are deployed in an environment to share specific molecular information such as odor, flavor, or any chemical state. In this paper, using the stochastic model of molecular reactions in biochemical systems, a realistic channel model is first introduced for molecular communication. Then, based on the realistic channel model, we introduce a deterministic capacity expression for point-to-point, broadcast, and multiple-access molecular channels. We also investigate information flow capacity in a molecular nanonetwork for the realization of efficient communication and networking techniques for frontier nanonetwork applications. The results reveal that molecular point-to-point, broadcast, and multiple-access channels are feasible with a satisfactorily high molecular communication rate, which allows molecular information flow in nanonetworks. Furthermore, the derived molecular channel model with input-dependent noise term also reveals that unlike a traditional Gaussian communication channel, achievable capacity is affected by both lower and upper bounds of the channel input in molecular communication channels. textcopyright 2010 Elsevier Ltd. All rights reserved. |
2009 |
Parlak, Zehra; Hadizadeh, Rameen; Balantekin, Mujdat; Degertekin, Levent F Controlling tip-sample interaction forces during a single tap for improved topography and mechanical property imaging of soft materials by AFM Journal Article Ultramicroscopy, 2009, ISSN: 03043991. @article{Parlak2009, title = {Controlling tip-sample interaction forces during a single tap for improved topography and mechanical property imaging of soft materials by AFM}, author = {Zehra Parlak and Rameen Hadizadeh and Mujdat Balantekin and Levent F Degertekin}, doi = {10.1016/j.ultramic.2009.04.006}, issn = {03043991}, year = {2009}, date = {2009-01-01}, journal = {Ultramicroscopy}, abstract = {We introduce a method that exploits the "active" nature of the force-sensing integrated readout and active tip (FIRAT), a recently introduced atomic force microscopy (AFM) probe, to control the interaction forces during individual tapping events in tapping mode (TM) AFM. In this method the probe tip is actively retracted if the tip-sample interaction force exceeds a user-specified force threshold during a single tap while the tip is still in contact with the surface. The active tip control (ATC) circuitry designed for this method makes it possible to control the repulsive forces and indentation into soft samples, limiting the repulsive forces during the scan while avoiding instability due to attractive forces. We demonstrate the accurate topographical imaging capability of this method on suitable samples that possess both soft and stiff features. textcopyright 2009 Elsevier B.V. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We introduce a method that exploits the "active" nature of the force-sensing integrated readout and active tip (FIRAT), a recently introduced atomic force microscopy (AFM) probe, to control the interaction forces during individual tapping events in tapping mode (TM) AFM. In this method the probe tip is actively retracted if the tip-sample interaction force exceeds a user-specified force threshold during a single tap while the tip is still in contact with the surface. The active tip control (ATC) circuitry designed for this method makes it possible to control the repulsive forces and indentation into soft samples, limiting the repulsive forces during the scan while avoiding instability due to attractive forces. We demonstrate the accurate topographical imaging capability of this method on suitable samples that possess both soft and stiff features. textcopyright 2009 Elsevier B.V. All rights reserved. |
Şişman, Alper; Zahorian, Jaime; Gürün, Gökce; Karaman, Mustafa; Balantekin, Müjdat; Deģertekin, Levent F; Hasler, Paul Evaluation of CMUT annular arrays for side-looking IVUS Inproceedings Proceedings - IEEE Ultrasonics Symposium, 2009, ISSN: 10510117. @inproceedings{Sisman2009, title = {Evaluation of CMUT annular arrays for side-looking IVUS}, author = {Alper Şişman and Jaime Zahorian and Gökce Gürün and Mustafa Karaman and Müjdat Balantekin and Levent F Deģertekin and Paul Hasler}, doi = {10.1109/ULTSYM.2009.5441564}, issn = {10510117}, year = {2009}, date = {2009-01-01}, booktitle = {Proceedings - IEEE Ultrasonics Symposium}, abstract = {Side-looking (SL) IVUS probes are extensively used for management of cardiovascular diseases. Currently SL-IVUS imaging probes use either a single rotating transducer element or solid-state arrays. Probes with single rotating piezoelectric transducer have simple front-end, but have fixed focused operation, and suffers from motion artifacts. Solid-state SL-IVUS imaging probes use piezoelectric transducer arrays and electronic beam-forming. Synthetic phased array processing of signals detected with small-sized elements in these arrays limits the SNR achievable with these probes. In this study, we explore a new SL-IVUS probe architecture employing rotating phased annular CMUT arrays. We tested and compared imaging performance of the existing and proposed probe configurations through simulated point spread functions. We also two fabricated sample annular array designs operating at 20-MHz and 50-MHz. Our experimental measurements on the 20-MHz array in oil shows 105% fractional bandwidth. The 50-MHz array with parylene coating shows approximately 40% fractional bandwidth measured in water. We also present imaging results acquired from wire-targets to test the experimental point-spread functions.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } Side-looking (SL) IVUS probes are extensively used for management of cardiovascular diseases. Currently SL-IVUS imaging probes use either a single rotating transducer element or solid-state arrays. Probes with single rotating piezoelectric transducer have simple front-end, but have fixed focused operation, and suffers from motion artifacts. Solid-state SL-IVUS imaging probes use piezoelectric transducer arrays and electronic beam-forming. Synthetic phased array processing of signals detected with small-sized elements in these arrays limits the SNR achievable with these probes. In this study, we explore a new SL-IVUS probe architecture employing rotating phased annular CMUT arrays. We tested and compared imaging performance of the existing and proposed probe configurations through simulated point spread functions. We also two fabricated sample annular array designs operating at 20-MHz and 50-MHz. Our experimental measurements on the 20-MHz array in oil shows 105% fractional bandwidth. The 50-MHz array with parylene coating shows approximately 40% fractional bandwidth measured in water. We also present imaging results acquired from wire-targets to test the experimental point-spread functions. |
Guldiken, Rasim O; Zahorian, Jaime; Balantekin, Mujdat; Karaman, Mustafa; Degertekin, Levent F 2009. @inproceedings{Guldiken2009, title = {Multiple Annular Ring Capacitive Micromachined Ultrasonic Transducer Arrays for Forward-Looking Intravascular Ultrasound Imaging Catheters}, author = {Rasim O Guldiken and Jaime Zahorian and Mujdat Balantekin and Mustafa Karaman and Levent F Degertekin}, doi = {10.1115/imece2007-42493}, year = {2009}, date = {2009-01-01}, abstract = {We investigate niultiple-annular-ring CMUT array configuration for forward-looking intravascular ultrasound (FL-IVUS) imaging. This configuration has the potential for independent optimization of each ring and uses the silicon area more effectively without any particular drawback. We designed and fabricated a sample 1mm diameter dual annular ring CMUT test array which consists of 24 transmit and 32 receive elements. For imaging experiments, we designed IC chips that contain 8 transimpedance amplifiers, a multiplexer and a buffer. The real time-pulse echo experiments obtained with designed IC electronics show 26dB Signal to Noise Ratio (SNR) from a 3.5 mm away aluminum reflector in oil. This paper presents our first efforts in obtaining real time imaging with designed IC chips which is one step before CMUT on CMOS implementation. Copyright 2007 by ASME.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } We investigate niultiple-annular-ring CMUT array configuration for forward-looking intravascular ultrasound (FL-IVUS) imaging. This configuration has the potential for independent optimization of each ring and uses the silicon area more effectively without any particular drawback. We designed and fabricated a sample 1mm diameter dual annular ring CMUT test array which consists of 24 transmit and 32 receive elements. For imaging experiments, we designed IC chips that contain 8 transimpedance amplifiers, a multiplexer and a buffer. The real time-pulse echo experiments obtained with designed IC electronics show 26dB Signal to Noise Ratio (SNR) from a 3.5 mm away aluminum reflector in oil. This paper presents our first efforts in obtaining real time imaging with designed IC chips which is one step before CMUT on CMOS implementation. Copyright 2007 by ASME. |
Basturk, Ilhan; Ozbek, Berna Performance of EM-based channel estimation for STBC-OFDM systems Inproceedings 2009. @inproceedings{Basturk2009a, title = {Performance of EM-based channel estimation for STBC-OFDM systems}, author = {Ilhan Basturk and Berna Ozbek}, doi = {10.1109/siu.2009.5136338}, year = {2009}, date = {2009-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Ozbek, Berna; Ruyet, Didier Le Transmit beamforming techniques for multicast wireless communication systems Inproceedings 2009. @inproceedings{Ozbek2009b, title = {Transmit beamforming techniques for multicast wireless communication systems}, author = {Berna Ozbek and Didier Le Ruyet}, doi = {10.1109/siu.2009.5136377}, year = {2009}, date = {2009-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Tanyer, Ilker; Ozen, Serdar; Donmez, Cemalettin; Altinkaya, Mustafa Aziz Consistency analysis of Kalman Filter for Modal Analysis of Structures Inproceedings 2009. @inproceedings{Tanyer2009, title = {Consistency analysis of Kalman Filter for Modal Analysis of Structures}, author = {Ilker Tanyer and Serdar Ozen and Cemalettin Donmez and Mustafa Aziz Altinkaya}, doi = {10.1109/siu.2009.5136464}, year = {2009}, date = {2009-01-01}, abstract = {In this paper, consistency analysis of Kalman filter for modal analysis of structural systems is made. As a future work, A fundamental modal analysis algorithm, eigensystem realization algorithm(ERA) will be used with Kalman filters together to make a modal parameter estimation for a structural system. By applying ERA to the impulse response measurements taken from the structure, a state-space representation will be written. Kalman filter will be used as a state estimator in this study and it will have a critical role on minimizing the measurement noise. Before using Kalman filter with ERA, a consistency analysis of Kalman filter is made for artificial impulse response data of the structural system.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } In this paper, consistency analysis of Kalman filter for modal analysis of structural systems is made. As a future work, A fundamental modal analysis algorithm, eigensystem realization algorithm(ERA) will be used with Kalman filters together to make a modal parameter estimation for a structural system. By applying ERA to the impulse response measurements taken from the structure, a state-space representation will be written. Kalman filter will be used as a state estimator in this study and it will have a critical role on minimizing the measurement noise. Before using Kalman filter with ERA, a consistency analysis of Kalman filter is made for artificial impulse response data of the structural system. |
Wan, Alwin M D; Brooks, Daniel J; Gumus, Abdurrahman; Fischbach, Claudia; Malliaras, George G Electrical control of cell density gradients on a conducting polymer surface Journal Article Chemical Communications, 2009, ISSN: 13597345. @article{Wan2009, title = {Electrical control of cell density gradients on a conducting polymer surface}, author = {Alwin M D Wan and Daniel J Brooks and Abdurrahman Gumus and Claudia Fischbach and George G Malliaras}, doi = {10.1039/b911130a}, issn = {13597345}, year = {2009}, date = {2009-01-01}, journal = {Chemical Communications}, abstract = {We describe a conducting polymer device that can induce electrically controlled density gradients of normal and cancerous cell lines, and hence can be used as a tool for the study of cell-cell interactions.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We describe a conducting polymer device that can induce electrically controlled density gradients of normal and cancerous cell lines, and hence can be used as a tool for the study of cell-cell interactions. |
Onder, Devrim; Karacali, Bilge Automated clustering of histology slide texture using co-occurrence based grayscale image features and manifold learning Inproceedings 2009. @inproceedings{Onder2009, title = {Automated clustering of histology slide texture using co-occurrence based grayscale image features and manifold learning}, author = {Devrim Onder and Bilge Karacali}, doi = {10.1109/biyomut.2009.5130342}, year = {2009}, date = {2009-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Tatlicioglu, Enver; Braganza, David; Burg, Timothy C; Dawson, Darren M Adaptive control of redundant robot manipulators with sub-task objectives Journal Article Robotica, 2009, ISSN: 02635747. @article{Tatlicioglu2009, title = {Adaptive control of redundant robot manipulators with sub-task objectives}, author = {Enver Tatlicioglu and David Braganza and Timothy C Burg and Darren M Dawson}, doi = {10.1017/S0263574708005274}, issn = {02635747}, year = {2009}, date = {2009-01-01}, journal = {Robotica}, abstract = {In this paper, adaptive control of kinematically redundant robot manipulators is considered. An end-effector tracking controller is designed and the manipulator's kinematic redundancy is utilized to integrate a general sub-task controller for self-motion control. The control objectives are achieved by designing a feedback linearizing controller that includes a least-squares estimation algorithm to compensate for the parametric uncertainties. Numerical simulation results are presented to show the validity of the proposed controller.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this paper, adaptive control of kinematically redundant robot manipulators is considered. An end-effector tracking controller is designed and the manipulator's kinematic redundancy is utilized to integrate a general sub-task controller for self-motion control. The control objectives are achieved by designing a feedback linearizing controller that includes a least-squares estimation algorithm to compensate for the parametric uncertainties. Numerical simulation results are presented to show the validity of the proposed controller. |
Çek, ME; Savaci, FA Stable non-Gaussian noise parameter modulation in digital communication Journal Article Electronics Letters, 45 (24), pp. 1256–1257, 2009. @article{pop00004kb, title = {Stable non-Gaussian noise parameter modulation in digital communication}, author = {ME Çek and FA Savaci}, year = {2009}, date = {2009-01-01}, journal = {Electronics Letters}, volume = {45}, number = {24}, pages = {1256--1257}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Lee, Dong Bin; Burg, Timothy C; Dawson, Darren M; Shu, Dule; Xian, Bin; Tatlicioglu, Enver Robust tracking control of an underactuated quadrotor aerial-robot based on a parametric uncertain model Inproceedings Conference Proceedings - IEEE International Conference on Systems, Man and Cybernetics, 2009, ISSN: 1062922X. @inproceedings{Lee2009, title = {Robust tracking control of an underactuated quadrotor aerial-robot based on a parametric uncertain model}, author = {Dong Bin Lee and Timothy C Burg and Darren M Dawson and Dule Shu and Bin Xian and Enver Tatlicioglu}, doi = {10.1109/ICSMC.2009.5346158}, issn = {1062922X}, year = {2009}, date = {2009-01-01}, booktitle = {Conference Proceedings - IEEE International Conference on Systems, Man and Cybernetics}, abstract = {In this paper, the tracking control of a underactuated quadrotor aerial vehicle is presented where position and yaw trajectory tracking is achieved using feedback control system. The control design is complicated by considering parametric uncertainty in the dynamic modeling of the quadrotor aerial-robot. Robust control schemes are then designed using a Lyapunov-based approach to compensate for the unknown parameters in each dynamic subsystem model. Lyapunov-type stability analysis suggests a global uniform ultimately bounded (GUUB) tracking result.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } In this paper, the tracking control of a underactuated quadrotor aerial vehicle is presented where position and yaw trajectory tracking is achieved using feedback control system. The control design is complicated by considering parametric uncertainty in the dynamic modeling of the quadrotor aerial-robot. Robust control schemes are then designed using a Lyapunov-based approach to compensate for the unknown parameters in each dynamic subsystem model. Lyapunov-type stability analysis suggests a global uniform ultimately bounded (GUUB) tracking result. |
Karakilinc, OO; Dinleyici, MS A study on nonlinear photonic crystal optical switching with χ(3)type material Journal Article 2009 IEEE 17th Signal Processing and Communications Applications Conference …, 2009. @article{pop00027d, title = {A study on nonlinear photonic crystal optical switching with χ(3)type material}, author = {OO Karakilinc and MS Dinleyici}, year = {2009}, date = {2009-01-01}, journal = {2009 IEEE 17th Signal Processing and Communications Applications Conference …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Nath, Nitendra; Tatlicioglu, Enver; Dawson, Darren M Teleoperation with kinematically redundant robot manipulators with sub-task objectives Journal Article Robotica, 2009, ISSN: 02635747. @article{Nath2009, title = {Teleoperation with kinematically redundant robot manipulators with sub-task objectives}, author = {Nitendra Nath and Enver Tatlicioglu and Darren M Dawson}, doi = {10.1017/S026357470900544X}, issn = {02635747}, year = {2009}, date = {2009-01-01}, journal = {Robotica}, abstract = {In this paper, control of nonlinear teleoperator systems where both the master and slave systems are kinematically redundant robot manipulators is addressed. The controller is developed under the assumption that the user and environmental input forces are unmeasurable. Lyapunov-based stability analysis is used to prove that the proposed controller yields asymptotic tracking results and ensures the coordination of the master and slave systems while satisfying a sub-task objective. Numerical simulation results are presented to illustrate the effectiveness of the proposed controller.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this paper, control of nonlinear teleoperator systems where both the master and slave systems are kinematically redundant robot manipulators is addressed. The controller is developed under the assumption that the user and environmental input forces are unmeasurable. Lyapunov-based stability analysis is used to prove that the proposed controller yields asymptotic tracking results and ensures the coordination of the master and slave systems while satisfying a sub-task objective. Numerical simulation results are presented to illustrate the effectiveness of the proposed controller. |
Eroǧlu, Can; Savaci, Acar F Implementation of partial synchronization of different chaotic systems by field programmable gate array Inproceedings ECCTD 2009 - European Conference on Circuit Theory and Design Conference Program, 2009, ISBN: 9781424438969. @inproceedings{Eroglu2009, title = {Implementation of partial synchronization of different chaotic systems by field programmable gate array}, author = {Can Eroǧlu and Acar F Savaci}, doi = {10.1109/ECCTD.2009.5275038}, isbn = {9781424438969}, year = {2009}, date = {2009-01-01}, booktitle = {ECCTD 2009 - European Conference on Circuit Theory and Design Conference Program}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Ozbek, Erdal M; Savaci, Acar F Classification of Turkish musical instruments Inproceedings 2009. @inproceedings{Ozbek2009d, title = {Classification of Turkish musical instruments}, author = {Erdal M Ozbek and Acar F Savaci}, doi = {10.1109/siu.2009.5136358}, year = {2009}, date = {2009-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Eroglu, C; Savaci, FA Control System for Synchronization of Generalized Chua's Circuits in FPGA Miscellaneous 2009. @misc{pop00038bb, title = {Control System for Synchronization of Generalized Chua's Circuits in FPGA}, author = {C Eroglu and FA Savaci}, year = {2009}, date = {2009-01-01}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |
Cek, Emre M; Savaci, Acar F; Ozgiren, Murat Estimation of partial directed coherence and direction of information flow with auditory evoked potentials Inproceedings 2009. @inproceedings{Cek2009, title = {Estimation of partial directed coherence and direction of information flow with auditory evoked potentials}, author = {Emre M Cek and Acar F Savaci and Murat Ozgiren}, doi = {10.1109/biyomut.2009.5130260}, year = {2009}, date = {2009-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Ozbek, Erdal M; Savaci, Acar F Fundamental frequency tracking of musical signals with correntropy Inproceedings 2009. @inproceedings{Ozbek2009abb, title = {Fundamental frequency tracking of musical signals with correntropy}, author = {Erdal M Ozbek and Acar F Savaci}, doi = {10.1109/siu.2009.5136357}, year = {2009}, date = {2009-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Iyasere, Erhun; Dawson, Darren M; Wagner, John R; Salah, Mohammed; Tatlicioglu, Enver Nonlinear robust control to maximize energy capture in a variable speed wind turbine using an induction generator Inproceedings Conference Proceedings - IEEE International Conference on Systems, Man and Cybernetics, 2009, ISSN: 1062922X. @inproceedings{Iyasere2009, title = {Nonlinear robust control to maximize energy capture in a variable speed wind turbine using an induction generator}, author = {Erhun Iyasere and Darren M Dawson and John R Wagner and Mohammed Salah and Enver Tatlicioglu}, doi = {10.1109/ICSMC.2009.5346675}, issn = {1062922X}, year = {2009}, date = {2009-01-01}, booktitle = {Conference Proceedings - IEEE International Conference on Systems, Man and Cybernetics}, abstract = {The emergence of wind turbine systems for electric power generation can help satisfy the growing global demand. This paper proposes a control strategy to maximize the wind energy captured in a variable speed wind turbine, with an internal induction generator, at low to medium wind speeds. The proposed strategy controls the tip speed ratio, via the rotor angular speed, to an optimum point at which the efficiency constant (or power coefficient) is maximal for a particular blade pitch angle and wind speed. This control method allows for aerodynamic rotor power maximization without exact wind turbine model knowledge. textcopyright2009 IEEE.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } The emergence of wind turbine systems for electric power generation can help satisfy the growing global demand. This paper proposes a control strategy to maximize the wind energy captured in a variable speed wind turbine, with an internal induction generator, at low to medium wind speeds. The proposed strategy controls the tip speed ratio, via the rotor angular speed, to an optimum point at which the efficiency constant (or power coefficient) is maximal for a particular blade pitch angle and wind speed. This control method allows for aerodynamic rotor power maximization without exact wind turbine model knowledge. textcopyright2009 IEEE. |
Ozbakis, Basak; Oguzer, Taner; Kustepeli, Alp Three-dimensional electromagnetic scattering from flat plates by using sinc-type basis functions in method of moments Inproceedings 2009 Computational Electromagnetics International Workshop, CEM 2009, 2009, ISBN: 9781424442508. @inproceedings{Ozbakis2009, title = {Three-dimensional electromagnetic scattering from flat plates by using sinc-type basis functions in method of moments}, author = {Basak Ozbakis and Taner Oguzer and Alp Kustepeli}, doi = {10.1109/CEM.2009.5228106}, isbn = {9781424442508}, year = {2009}, date = {2009-01-01}, booktitle = {2009 Computational Electromagnetics International Workshop, CEM 2009}, abstract = {Sinc functions are used in the basis and testing procedures in the conventional method of moments (MoM) formulation. But unlike conventional MoM, simple pointwise meshing is enough and no integral computation is required due to the mathematical properties of the sinc function. The simulation results of surface current densities and radar cross section for a few wavelength square flat plate are obtained by using our own codes. The results are compared with those of the rooftop basis functions. The CPU-time decreases by half of the time of the conventional method. The error that occurs from the approximated integral of the sinc function in the computation of main matrix elements is very small and decreases while the bandwidth of the sinc function increases.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } Sinc functions are used in the basis and testing procedures in the conventional method of moments (MoM) formulation. But unlike conventional MoM, simple pointwise meshing is enough and no integral computation is required due to the mathematical properties of the sinc function. The simulation results of surface current densities and radar cross section for a few wavelength square flat plate are obtained by using our own codes. The results are compared with those of the rooftop basis functions. The CPU-time decreases by half of the time of the conventional method. The error that occurs from the approximated integral of the sinc function in the computation of main matrix elements is very small and decreases while the bandwidth of the sinc function increases. |
Saynak, Ugur; Kustepeli, Alp Novel Square Spiral Antennas for Broadband Applications Journal Article Frequenz, 2009, ISSN: 21916349. @article{Saynak2009, title = {Novel Square Spiral Antennas for Broadband Applications}, author = {Ugur Saynak and Alp Kustepeli}, doi = {10.1515/FREQ.2009.63.1-2.14}, issn = {21916349}, year = {2009}, date = {2009-01-01}, journal = {Frequenz}, abstract = {An investigation of novel square spiral antennas is presented. The antennas are designed by considering the special arrangements of spiral arms. The new designs perform much better in terms of the frequency independency of the fundamental antenna parameters, when compared with the well known and widely used Archimedean spiral antenna, which makes the antennas very suitable for broadband wireless applications. Experimental results are also presented and there is a good agreement between the measured and numerical data.}, keywords = {}, pubstate = {published}, tppubtype = {article} } An investigation of novel square spiral antennas is presented. The antennas are designed by considering the special arrangements of spiral arms. The new designs perform much better in terms of the frequency independency of the fundamental antenna parameters, when compared with the well known and widely used Archimedean spiral antenna, which makes the antennas very suitable for broadband wireless applications. Experimental results are also presented and there is a good agreement between the measured and numerical data. |
Atakan, Baris; Akan, Ozgur B Single and multiple-access channel capacity in molecular nanonetworks Inproceedings Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, 2009, ISSN: 18678211. @inproceedings{Atakan2009a, title = {Single and multiple-access channel capacity in molecular nanonetworks}, author = {Baris Atakan and Ozgur B Akan}, doi = {10.1007/978-3-642-04850-0_2}, issn = {18678211}, year = {2009}, date = {2009-01-01}, booktitle = {Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering}, abstract = {Molecular communication is a new nano-scale communication paradigm that enables nanomachines to communicate with each other by emitting molecules to their surrounding environment. Nanonetworks are also envisioned to be composed of a number of nanomachines with molecular communication capability that are deployed in an environment to share specific molecular information such as odor, flavour, light, or any chemical state. In this paper, using the principles of natural ligand-receptor binding mechanisms in biology, we first derive a capacity expression for single molecular channel in which a single Transmitter Nanomachine (TN) communicates with a single Receiver Nanomachine (RN). Then, we investigate the capacity of the molecular multiple-access channel in which multiple TNs communicate with a single RN. Numerical results reveal that high molecular communication capacities can be attainable for the single and multiple-access molecular channels. Institute for Computer Science, Social-Informatics and Telecommunications Engineering 2009.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } Molecular communication is a new nano-scale communication paradigm that enables nanomachines to communicate with each other by emitting molecules to their surrounding environment. Nanonetworks are also envisioned to be composed of a number of nanomachines with molecular communication capability that are deployed in an environment to share specific molecular information such as odor, flavour, light, or any chemical state. In this paper, using the principles of natural ligand-receptor binding mechanisms in biology, we first derive a capacity expression for single molecular channel in which a single Transmitter Nanomachine (TN) communicates with a single Receiver Nanomachine (RN). Then, we investigate the capacity of the molecular multiple-access channel in which multiple TNs communicate with a single RN. Numerical results reveal that high molecular communication capacities can be attainable for the single and multiple-access molecular channels. Institute for Computer Science, Social-Informatics and Telecommunications Engineering 2009. |
Atakan, B; Akan, OB Carbon nanotube sensor networks Journal Article Proc. of IEEE Nanocom, 2009. @article{pop00015b, title = {Carbon nanotube sensor networks}, author = {B Atakan and OB Akan}, year = {2009}, date = {2009-01-01}, journal = {Proc. of IEEE Nanocom}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Atakan, B; Akan, ÖB; Tuğcu, T Bio-inspired communications in wireless sensor networks Journal Article Guide to wireless sensor networks, pp. 659–685, 2009. @article{pop00018b, title = {Bio-inspired communications in wireless sensor networks}, author = {B Atakan and ÖB Akan and T Tuğcu}, year = {2009}, date = {2009-01-01}, journal = {Guide to wireless sensor networks}, pages = {659--685}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Lee, DB; Chitrakaran, VK; Burg, TC; Dawson, DM; Xian, B; Tatlicioglu, E Integrated Control of a Remotely Operated Quadrotor UAV and Camera Unit by Fly-The-Camera Perspective Miscellaneous 2009. @misc{pop00103, title = {Integrated Control of a Remotely Operated Quadrotor UAV and Camera Unit by Fly-The-Camera Perspective}, author = {DB Lee and VK Chitrakaran and TC Burg and DM Dawson and B Xian and E Tatlicioglu}, year = {2009}, date = {2009-01-01}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |
Kress, Rainer; Yaman, Fatih; Yapar, Ali; Akduman, Ibrahim Inverse scattering for an impedance cylinder buried in a dielectric cylinder Journal Article Inverse Problems in Science and Engineering, 2009, ISSN: 17415977. @article{Kress2009, title = {Inverse scattering for an impedance cylinder buried in a dielectric cylinder}, author = {Rainer Kress and Fatih Yaman and Ali Yapar and Ibrahim Akduman}, doi = {10.1080/17415970802131760}, issn = {17415977}, year = {2009}, date = {2009-01-01}, journal = {Inverse Problems in Science and Engineering}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yaman, Fatih Location and shape reconstructions of sound-soft obstacles buried in penetrable cylinders Journal Article Inverse Problems, 2009, ISSN: 02665611. @article{Yaman2009, title = {Location and shape reconstructions of sound-soft obstacles buried in penetrable cylinders}, author = {Fatih Yaman}, doi = {10.1088/0266-5611/25/6/065005}, issn = {02665611}, year = {2009}, date = {2009-01-01}, journal = {Inverse Problems}, abstract = {In this paper, we present a method for the solution of a location and$backslash$nshape reconstruction problem related to sound-soft obstacles buried in$backslash$narbitrarily shaped penetrable cylinders in two dimensions. The direct$backslash$nproblem considered here is to obtain the scattered near/far-field in the$backslash$ncase of a single time-harmonic acoustic plane wave insonification. The$backslash$naim of the inverse problem is to find the shape as well as the location$backslash$nof the buried scatterer from the limited/full aperture measurements of$backslash$nthe scattered field via Newton iterations. Both for the direct and$backslash$ninverse scattering problems, different potential (layer) approaches are$backslash$nused to derive a system of boundary integral equations. The integral$backslash$nequations are evaluated by using Nystrom and collocation methods.$backslash$nMoreover, in order to obtain a stable solution of the first kind of$backslash$nFredholm-type integral equations Tikhonov regularization is employed. We$backslash$ntest the applicability and the effectiveness of the inversion algorithm$backslash$nalso with noisy limited far-field data and obtain satisfactory numerical$backslash$nresults as illustrated in the last section.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this paper, we present a method for the solution of a location and$backslash$nshape reconstruction problem related to sound-soft obstacles buried in$backslash$narbitrarily shaped penetrable cylinders in two dimensions. The direct$backslash$nproblem considered here is to obtain the scattered near/far-field in the$backslash$ncase of a single time-harmonic acoustic plane wave insonification. The$backslash$naim of the inverse problem is to find the shape as well as the location$backslash$nof the buried scatterer from the limited/full aperture measurements of$backslash$nthe scattered field via Newton iterations. Both for the direct and$backslash$ninverse scattering problems, different potential (layer) approaches are$backslash$nused to derive a system of boundary integral equations. The integral$backslash$nequations are evaluated by using Nystrom and collocation methods.$backslash$nMoreover, in order to obtain a stable solution of the first kind of$backslash$nFredholm-type integral equations Tikhonov regularization is employed. We$backslash$ntest the applicability and the effectiveness of the inversion algorithm$backslash$nalso with noisy limited far-field data and obtain satisfactory numerical$backslash$nresults as illustrated in the last section. |
Kress, R; Tezel, N; Yaman, F A second order Newton method for sound soft inverse obstacle scattering Journal Article Journal of Inverse and Ill-Posed Problems, 17 (2), pp. 173–185, 2009. @article{pop00003cb, title = {A second order Newton method for sound soft inverse obstacle scattering}, author = {R Kress and N Tezel and F Yaman}, year = {2009}, date = {2009-01-01}, journal = {Journal of Inverse and Ill-Posed Problems}, volume = {17}, number = {2}, pages = {173--185}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yaman, F; Şimşek, S Shape reconstruction of an inhomogeneous impedance cylinder via potential and Neural Network approach Journal Article Microwave and Optical Technology Letters, 51 (1), pp. 119–124, 2009. @article{pop00012d, title = {Shape reconstruction of an inhomogeneous impedance cylinder via potential and Neural Network approach}, author = {F Yaman and S Şimşek}, year = {2009}, date = {2009-01-01}, journal = {Microwave and Optical Technology Letters}, volume = {51}, number = {1}, pages = {119--124}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yaman, F Inverse scattering problems for the objects buried in penetrable cylinders Journal Article PhD Thesis, Istanbul Technical University, 2009. @article{pop00016b, title = {Inverse scattering problems for the objects buried in penetrable cylinders}, author = {F Yaman}, year = {2009}, date = {2009-01-01}, journal = {PhD Thesis, Istanbul Technical University}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yaman, F Geçirgen Silindirler İçerisine Gömülü Cisimler İçin Ters Saçılma Problemleri Journal Article Fen Bilimleri Enstitüsü, 2009. @article{pop00028bb, title = {Geçirgen Silindirler İçerisine Gömülü Cisimler İçin Ters Saçılma Problemleri}, author = {F Yaman}, year = {2009}, date = {2009-01-01}, journal = {Fen Bilimleri Enstitüsü}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
YAMAN, F ISTANBUL TECHNICAL UNIVERSITY 击 INSTITUTE OF SCIENCE AND TECHNOLOGY Miscellaneous 2009. @misc{pop00029bb, title = {ISTANBUL TECHNICAL UNIVERSITY 击 INSTITUTE OF SCIENCE AND TECHNOLOGY}, author = {F YAMAN}, year = {2009}, date = {2009-01-01}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |
Yuksel, Kivilcim; Wuilpart, Marc; Mégret, Patrice Analysis and suppression of nonlinear frequency modulation in an optical frequency-domain reflectometer Journal Article Optics Express, 2009. @article{Yuksel2009b, title = {Analysis and suppression of nonlinear frequency modulation in an optical frequency-domain reflectometer}, author = {Kivilcim Yuksel and Marc Wuilpart and Patrice Mégret}, doi = {10.1364/oe.17.005845}, year = {2009}, date = {2009-01-01}, journal = {Optics Express}, abstract = {A new method for monitoring the nonlinearities perturbing the optical frequency sweep in high speed tunable laser sources is presented. The swept-frequency monitoring system comprises a Mach-Zehnder interferometer and simple signal processing steps. It has been implemented in a coherent optical frequency domain reflectometer which allowed to drastically reduce the effects of nonlinear sweep, resulting to a spatial resolution enhancement of 30 times. textcopyright 2009 Optical Society of America.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A new method for monitoring the nonlinearities perturbing the optical frequency sweep in high speed tunable laser sources is presented. The swept-frequency monitoring system comprises a Mach-Zehnder interferometer and simple signal processing steps. It has been implemented in a coherent optical frequency domain reflectometer which allowed to drastically reduce the effects of nonlinear sweep, resulting to a spatial resolution enhancement of 30 times. textcopyright 2009 Optical Society of America. |
Yuksel, K; Wuilpart, M; Moeyaert, V; Mégret, P Optical frequency domain reflectometry: A review (Invited) Journal Article Transparent Optical Networks, 2009. ICTON'09. 11th International Conference …, 2009. @article{pop00003db, title = {Optical frequency domain reflectometry: A review (Invited)}, author = {K Yuksel and M Wuilpart and V Moeyaert and P Mégret}, year = {2009}, date = {2009-01-01}, journal = {Transparent Optical Networks, 2009. ICTON'09. 11th International Conference …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Özbek, Berna; Ruyet, Didier Le Reduced feedback designs for SDMA-OFDMA systems Inproceedings IEEE International Conference on Communications, 2009, ISSN: 05361486. @inproceedings{Ozbek2009abb, title = {Reduced feedback designs for SDMA-OFDMA systems}, author = {Berna Özbek and Didier Le Ruyet}, doi = {10.1109/ICC.2009.5199400}, issn = {05361486}, year = {2009}, date = {2009-01-01}, booktitle = {IEEE International Conference on Communications}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Ustok, Refik Fatih; Ozbek, Berna Spectrum sensing based on energy detection for Cognitive Radio systems with multiple antennas Inproceedings 2009. @inproceedings{Ustok2009, title = {Spectrum sensing based on energy detection for Cognitive Radio systems with multiple antennas}, author = {Refik Fatih Ustok and Berna Ozbek}, doi = {10.1109/siu.2009.5136416}, year = {2009}, date = {2009-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Özbek, Berna; Ruyet, Didier Le Adaptive resource allocation for SDMA-OFDMA systems with genetic algorithm Inproceedings Proceedings of the 2009 6th International Symposium on Wireless Communication Systems, ISWCS'09, 2009, ISBN: 9781424435845. @inproceedings{Ozbek2009c, title = {Adaptive resource allocation for SDMA-OFDMA systems with genetic algorithm}, author = {Berna Özbek and Didier Le Ruyet}, doi = {10.1109/ISWCS.2009.5285288}, isbn = {9781424435845}, year = {2009}, date = {2009-01-01}, booktitle = {Proceedings of the 2009 6th International Symposium on Wireless Communication Systems, ISWCS'09}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Baştürk, Ilhan; ÖZbek, Berna Iterative EM-based channel estimation for STBC-OFDM Inproceedings IEEE Wireless Communications and Networking Conference, WCNC, 2009, ISSN: 15253511. @inproceedings{Basturk2009b, title = {Iterative EM-based channel estimation for STBC-OFDM}, author = {Ilhan Baştürk and Berna ÖZbek}, doi = {10.1109/WCNC.2009.4917765}, issn = {15253511}, year = {2009}, date = {2009-01-01}, booktitle = {IEEE Wireless Communications and Networking Conference, WCNC}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Baştürk, Ilhan; ÖZbek, Berna Iterative EM-based channel estimation for STBC-OFDM Inproceedings IEEE Wireless Communications and Networking Conference, WCNC, 2009, ISSN: 15253511. @inproceedings{Basturk2009bb, title = {Iterative EM-based channel estimation for STBC-OFDM}, author = {Ilhan Baştürk and Berna ÖZbek}, doi = {10.1109/WCNC.2009.4917765}, issn = {15253511}, year = {2009}, date = {2009-01-01}, booktitle = {IEEE Wireless Communications and Networking Conference, WCNC}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Yüksel, K; Wuilpart, M; Mégret, P Spatial resolution enhancement in coherent optical frequency domain reflectometer by suppression of nonlinear frequency modulation Journal Article Proceedings of the IEEE Photonics Society 13th Annual Workshop, 2009. @article{pop00052b, title = {Spatial resolution enhancement in coherent optical frequency domain reflectometer by suppression of nonlinear frequency modulation}, author = {K Yüksel and M Wuilpart and P Mégret}, year = {2009}, date = {2009-01-01}, journal = {Proceedings of the IEEE Photonics Society 13th Annual Workshop}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yüksel, K; Wuilpart, M; Mégret, P Réflectométrie optique cohérente dans le domaine fréquentiel avec compensation des non-linéarités de la source Journal Article Journées Nationales d'Optique Guidée, pp. 274–276, 2009. @article{pop00053bb, title = {Réflectométrie optique cohérente dans le domaine fréquentiel avec compensation des non-linéarités de la source}, author = {K Yüksel and M Wuilpart and P Mégret}, year = {2009}, date = {2009-01-01}, journal = {Journées Nationales d'Optique Guidée}, pages = {274--276}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
2008 |
Yaman, F Numerical solution of an inverse conductive boundary value problem Journal Article Radio Science, 43 (6), pp. 1–10, 2008. @article{pop00006d, title = {Numerical solution of an inverse conductive boundary value problem}, author = {F Yaman}, year = {2008}, date = {2008-01-01}, journal = {Radio Science}, volume = {43}, number = {6}, pages = {1--10}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yaman, F Inverse scattering of an arbitrarily shaped buried scatterer with conductive boundary condition Journal Article Proceedings of the 8th World Congress on Computational Mechanics and 5th …, 2008. @article{pop00013c, title = {Inverse scattering of an arbitrarily shaped buried scatterer with conductive boundary condition}, author = {F Yaman}, year = {2008}, date = {2008-01-01}, journal = {Proceedings of the 8th World Congress on Computational Mechanics and 5th …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Özbek, B; Ruyet, Le D; Khanfir, H Performance evaluation of multicast MISO–OFDM systems Journal Article annals of telecommunications-annales des télécommunications 63 (5-6), pp. 295–305, 2008. @article{pop00012bb, title = {Performance evaluation of multicast MISO–OFDM systems}, author = {B Özbek and Le D Ruyet and H Khanfir}, year = {2008}, date = {2008-01-01}, journal = {annals of telecommunications-annales des télécommunications 63 (5-6)}, pages = {295--305}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yaman, F; Şimc̈ek, S Erratum: Neural network approach to determine nonsmooth one‐dimensional profiles in inverse scattering theory Journal Article Microwave and Optical Technology Letters, 50 (2), pp. 549–549, 2008. @article{pop00030d, title = {Erratum: Neural network approach to determine nonsmooth one‐dimensional profiles in inverse scattering theory}, author = {F Yaman and S Şimc̈ek}, year = {2008}, date = {2008-01-01}, journal = {Microwave and Optical Technology Letters}, volume = {50}, number = {2}, pages = {549--549}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yuksel, K; Moeyaert, V; Wuilpart, M; Mégret, P Optical layer monitoring in passive optical networks (PONs): A review (Invited) Journal Article Transparent Optical Networks, 2008. ICTON 2008, 2008. @article{pop00001db, title = {Optical layer monitoring in passive optical networks (PONs): A review (Invited)}, author = {K Yuksel and V Moeyaert and M Wuilpart and P Mégret}, year = {2008}, date = {2008-01-01}, journal = {Transparent Optical Networks, 2008. ICTON 2008}, publisher = {10th Anniversary …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Apaydın, MS; Conitzer, V; Donald, BR Structure-based protein NMR assignments using native structural ensembles Journal Article Journal of Biomolecular NMR, 40 (4), pp. 263–276, 2008. @article{pop00015i, title = {Structure-based protein NMR assignments using native structural ensembles}, author = {MS Apaydın and V Conitzer and BR Donald}, year = {2008}, date = {2008-01-01}, journal = {Journal of Biomolecular NMR}, volume = {40}, number = {4}, pages = {263--276}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ruyet, Didier Le; Khanfir, Hajer; Özbek, Berna Performance of semi-orthogonal user selection for multiuser MISO systems Inproceedings IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC, 2008. @inproceedings{LeRuyet2008, title = {Performance of semi-orthogonal user selection for multiuser MISO systems}, author = {Didier Le Ruyet and Hajer Khanfir and Berna Özbek}, doi = {10.1109/SPAWC.2008.4641622}, year = {2008}, date = {2008-01-01}, booktitle = {IEEE Workshop on Signal Processing Advances in Wireless Communications, SPAWC}, abstract = {For MISO multiuser downlink wireless communication system with$backslash$nprecoding at the transmission, the channel state information at$backslash$nthe transmitter can provide tremendous capacity gains. However,$backslash$nthe amount of feedback data increases with the number of users in$backslash$nthe cell and the number of transmit antennas. In this paper, we$backslash$nstudy the performance of different user selection algorithms at$backslash$nthe receiver side through the noisy uplink channel. We evaluate$backslash$nthe effect of the noisy channel on the classical norm criterion$backslash$nwith a criterion based on the orthogonality between the user$backslash$nchannels. Without cooperation between the users, we only allow$backslash$nusers that are semi-orthogonal to feedback their channel$backslash$ninformation as analog and quantized information to the base$backslash$nstation through the noisy uplink channel. We propose an algorithm$backslash$nto reduce the noise effect on the analog feedback for$backslash$nsemi-orthogonal user selection algorithm. We show that the$backslash$nsemi-orthogonal criterion with quantized feedback gives a better$backslash$nperformance compared to the norm criterion for perfect and noisy$backslash$nuplink channels.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } For MISO multiuser downlink wireless communication system with$backslash$nprecoding at the transmission, the channel state information at$backslash$nthe transmitter can provide tremendous capacity gains. However,$backslash$nthe amount of feedback data increases with the number of users in$backslash$nthe cell and the number of transmit antennas. In this paper, we$backslash$nstudy the performance of different user selection algorithms at$backslash$nthe receiver side through the noisy uplink channel. We evaluate$backslash$nthe effect of the noisy channel on the classical norm criterion$backslash$nwith a criterion based on the orthogonality between the user$backslash$nchannels. Without cooperation between the users, we only allow$backslash$nusers that are semi-orthogonal to feedback their channel$backslash$ninformation as analog and quantized information to the base$backslash$nstation through the noisy uplink channel. We propose an algorithm$backslash$nto reduce the noise effect on the analog feedback for$backslash$nsemi-orthogonal user selection algorithm. We show that the$backslash$nsemi-orthogonal criterion with quantized feedback gives a better$backslash$nperformance compared to the norm criterion for perfect and noisy$backslash$nuplink channels. |
Ozbek, Berna; Ruyet, Didier Le Sum-rate maximized adaptive subcarrier and bit allocation for multiuser OFDM systems with genetic algorithm Inproceedings 2008. @inproceedings{Ozbek2008a, title = {Sum-rate maximized adaptive subcarrier and bit allocation for multiuser OFDM systems with genetic algorithm}, author = {Berna Ozbek and Didier Le Ruyet}, doi = {10.1109/siu.2008.4632674}, year = {2008}, date = {2008-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Khanfir, Hajer; Ruyet, Didier Le; Özbek, Berna Semi-orthogonal user selection for MISO systems with quantized feedback Inproceedings 2008 International ITG Workshop on Smart Antennas, WSA 2008, 2008, ISBN: 9781424417575. @inproceedings{Khanfir2008, title = {Semi-orthogonal user selection for MISO systems with quantized feedback}, author = {Hajer Khanfir and Didier Le Ruyet and Berna Özbek}, doi = {10.1109/WSA.2008.4475554}, isbn = {9781424417575}, year = {2008}, date = {2008-01-01}, booktitle = {2008 International ITG Workshop on Smart Antennas, WSA 2008}, abstract = {For MISO multi-users downlink wireless communication system with$backslash$nprecoding at the transmission, the channel state of information at$backslash$nthe transmitter can provide tremendous capacity gains. However, the$backslash$namount of feedback data increase with the users number in the cell$backslash$nand the number of transmit antennas. In this paper, we study$backslash$ndifferent algorithms and criteria in order to significantly$backslash$nreduced the amount of feedback data. We associate the classical norm$backslash$ncriterion with a criterion based on the orthogonality between the user$backslash$nchannels. Without$backslash$ncooperation between the users, we only allow users that are$backslash$northogonal to feedback their channel information (CQI and CDI) to$backslash$nthe base station. The feedbacked CDI is quantized using a local$backslash$ngrassmanian packing . We show that the proposed combined$backslash$ncriterion with a finite feedback rate gives better performance compared$backslash$nto the norm criterion.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } For MISO multi-users downlink wireless communication system with$backslash$nprecoding at the transmission, the channel state of information at$backslash$nthe transmitter can provide tremendous capacity gains. However, the$backslash$namount of feedback data increase with the users number in the cell$backslash$nand the number of transmit antennas. In this paper, we study$backslash$ndifferent algorithms and criteria in order to significantly$backslash$nreduced the amount of feedback data. We associate the classical norm$backslash$ncriterion with a criterion based on the orthogonality between the user$backslash$nchannels. Without$backslash$ncooperation between the users, we only allow users that are$backslash$northogonal to feedback their channel information (CQI and CDI) to$backslash$nthe base station. The feedbacked CDI is quantized using a local$backslash$ngrassmanian packing . We show that the proposed combined$backslash$ncriterion with a finite feedback rate gives better performance compared$backslash$nto the norm criterion. |
Balantekin, Mujdat; Degertekin, Levent F Accurate modeling of capacitive micromachined ultrasonic transducers in pulse-echo operation Inproceedings Proceedings - IEEE Ultrasonics Symposium, 2008, ISSN: 10510117. @inproceedings{Balantekin2008, title = {Accurate modeling of capacitive micromachined ultrasonic transducers in pulse-echo operation}, author = {Mujdat Balantekin and Levent F Degertekin}, doi = {10.1109/ULTSYM.2008.0521}, issn = {10510117}, year = {2008}, date = {2008-01-01}, booktitle = {Proceedings - IEEE Ultrasonics Symposium}, abstract = {We present a large-signal model of capacitive micromachined ultrasonic transducers (CMUTs). This model combined with transmit-receive electronics is implemented in an electrical circuit simulator. We investigate optimum biasing scheme to increase output pressure and the amount of nonlinearity generated in transmit. Comparison to experiments shows that the model can be used to estimate the performance of CMUTs in pulse-echo operation.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } We present a large-signal model of capacitive micromachined ultrasonic transducers (CMUTs). This model combined with transmit-receive electronics is implemented in an electrical circuit simulator. We investigate optimum biasing scheme to increase output pressure and the amount of nonlinearity generated in transmit. Comparison to experiments shows that the model can be used to estimate the performance of CMUTs in pulse-echo operation. |
Guldiken, Rasim O; Balantekin, Mujdat; Zahorian, Jaime; Degertekin, Levent F Characterization of dual-electrode CMUTs: Demonstration of improved receive performance and pulse echo operation with dynamic membrane shaping Journal Article IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, 2008, ISSN: 08853010. @article{Guldiken2008, title = {Characterization of dual-electrode CMUTs: Demonstration of improved receive performance and pulse echo operation with dynamic membrane shaping}, author = {Rasim O Guldiken and Mujdat Balantekin and Jaime Zahorian and Levent F Degertekin}, doi = {10.1109/TUFFC.933}, issn = {08853010}, year = {2008}, date = {2008-01-01}, journal = {IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control}, abstract = {A 1-D dual-electrode CMUT array for intracardiac echocardiography (ICE) with a center frequency of 8 MHz has been designed, fabricated, and used to demonstrate the potential of dual-electrode CMUTs. Using a dual-electrode CMUT, 9 dB higher receive signal level is obtained over the 6 dB fractional bandwidth as compared with a conventional CMUT with an identical center electrode biased close to its collapse voltage. Because the same device shows a 7.4 dB increase in maximum pressure output, 16.4 dB overall improvement in transduction performance has been achieved as compared with conventional CMUT. A net peak output pressure of 1.6 MPa on the dual-electrode CMUT membrane with tone burst excitation at 12 MHz is also reported. The frequency response of the dual-electrode CMUT is similar to that of a conventional CMUT with the same membrane geometry with about 15% increase in the center frequency. Monostatic operation of dual-electrode CMUTs shows that the high performance of the transducer is applicable in typical pulse-echo imaging mode of operation. With dynamic shaping of the CMUT membrane to optimize the transmit-and-receive modes of operation separately during each pulse-echo cycle, dual-electrode CMUT is a highly competitive alternative to its piezoelectric counterparts.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A 1-D dual-electrode CMUT array for intracardiac echocardiography (ICE) with a center frequency of 8 MHz has been designed, fabricated, and used to demonstrate the potential of dual-electrode CMUTs. Using a dual-electrode CMUT, 9 dB higher receive signal level is obtained over the 6 dB fractional bandwidth as compared with a conventional CMUT with an identical center electrode biased close to its collapse voltage. Because the same device shows a 7.4 dB increase in maximum pressure output, 16.4 dB overall improvement in transduction performance has been achieved as compared with conventional CMUT. A net peak output pressure of 1.6 MPa on the dual-electrode CMUT membrane with tone burst excitation at 12 MHz is also reported. The frequency response of the dual-electrode CMUT is similar to that of a conventional CMUT with the same membrane geometry with about 15% increase in the center frequency. Monostatic operation of dual-electrode CMUTs shows that the high performance of the transducer is applicable in typical pulse-echo imaging mode of operation. With dynamic shaping of the CMUT membrane to optimize the transmit-and-receive modes of operation separately during each pulse-echo cycle, dual-electrode CMUT is a highly competitive alternative to its piezoelectric counterparts. |
Guldiken, Rasim O; Zahorian, Jaime; Balantekin, Mujdat; Degertekin, Levent F Dual-Electrode CMUT Optimization for CMUTs with Uniform and non-uniform Membranes Inproceedings Proceedings - IEEE Ultrasonics Symposium, 2008, ISSN: 10510117. @inproceedings{Guldiken2008a, title = {Dual-Electrode CMUT Optimization for CMUTs with Uniform and non-uniform Membranes}, author = {Rasim O Guldiken and Jaime Zahorian and Mujdat Balantekin and Levent F Degertekin}, doi = {10.1109/ULTSYM.2008.0518}, issn = {10510117}, year = {2008}, date = {2008-01-01}, booktitle = {Proceedings - IEEE Ultrasonics Symposium}, abstract = {In this paper, we report optimization results on dual-electrode CMUTs with uniform and non-uniform membranes. The electromechanical coupling coefficient (k2) is both simulated and experimentally measured for conventional and dual-electrode CMUTs. The electromechanical coupling coefficient (k2) of 0.82 at 90% of collapse voltage as well as 136% 3dB one-way fractional bandwidth is measured with dual-electrode CMUT with non-uniform membranes. The dual-electrode structure provides high coupling coefficient in a large DC bias range without collapsing the membrane while the large bandwidth is achieved by utilizing a non-uniform membrane. In addition, approximately 20dB increase in transduction performance is illustrated with dual electrode CMUT with non-uniform membrane as compared to conventional CMUT with uniform membrane.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } In this paper, we report optimization results on dual-electrode CMUTs with uniform and non-uniform membranes. The electromechanical coupling coefficient (k2) is both simulated and experimentally measured for conventional and dual-electrode CMUTs. The electromechanical coupling coefficient (k2) of 0.82 at 90% of collapse voltage as well as 136% 3dB one-way fractional bandwidth is measured with dual-electrode CMUT with non-uniform membranes. The dual-electrode structure provides high coupling coefficient in a large DC bias range without collapsing the membrane while the large bandwidth is achieved by utilizing a non-uniform membrane. In addition, approximately 20dB increase in transduction performance is illustrated with dual electrode CMUT with non-uniform membrane as compared to conventional CMUT with uniform membrane. |
Zahorian, Jaime; Guldiken, Rasim; Gurun, Gokce; Qureshi, Muhammad Shakeel; Balantekin, Mujdat; Hasler, Paul; Degertekin, Levent F Single chip CMUT arrays with integrated CMOS electronics: Fabrication process development and experimental results Inproceedings Proceedings - IEEE Ultrasonics Symposium, 2008, ISSN: 10510117. @inproceedings{Zahorian2008, title = {Single chip CMUT arrays with integrated CMOS electronics: Fabrication process development and experimental results}, author = {Jaime Zahorian and Rasim Guldiken and Gokce Gurun and Muhammad Shakeel Qureshi and Mujdat Balantekin and Paul Hasler and Levent F Degertekin}, doi = {10.1109/ULTSYM.2008.0095}, issn = {10510117}, year = {2008}, date = {2008-01-01}, booktitle = {Proceedings - IEEE Ultrasonics Symposium}, abstract = {One of the most important promises of capacitive micromachined ultrasonic transducer (CMUT) technology is integration with electronics. This approach maximizes transducer sensitivity by minimizing parasitic capacitances and ultimately improves the signal to noise ratio. Additionally, due to physical size limitations required for catheter based imaging devices, optimization of area occurs when the CMUTs are fabricated directly above the associated electronics. Here, we describe successful fabrication of CMUTs on custom designed CMOS electronics from a commercial IC foundry. This is achieved by modifying a low temperature micromachining process by adding one additional mask and developing a sloped wall dry etching step on isolation oxide layer for metal interconnect. Experiments show that both the CMUT and the integrated CMOS electronics are functional, resulting combination generating pulse-echo response suitable for ultrasound imaging.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } One of the most important promises of capacitive micromachined ultrasonic transducer (CMUT) technology is integration with electronics. This approach maximizes transducer sensitivity by minimizing parasitic capacitances and ultimately improves the signal to noise ratio. Additionally, due to physical size limitations required for catheter based imaging devices, optimization of area occurs when the CMUTs are fabricated directly above the associated electronics. Here, we describe successful fabrication of CMUTs on custom designed CMOS electronics from a commercial IC foundry. This is achieved by modifying a low temperature micromachining process by adding one additional mask and developing a sloped wall dry etching step on isolation oxide layer for metal interconnect. Experiments show that both the CMUT and the integrated CMOS electronics are functional, resulting combination generating pulse-echo response suitable for ultrasound imaging. |
Gurun, Gokce; Qureshi, Muhammad Shakeel; Balantekin, Mujdat; Guldiken, Rasim; Zahorian, Jaime; Peng, Sheng Yu; Basu, Arindam; Karaman, Mustafa; Hasler, Paul; Degertekin, Levent Front-end CMOS electronics for monolithic integration with CMUT arrays: Circuit design and initial experimental results Inproceedings Proceedings - IEEE Ultrasonics Symposium, 2008, ISSN: 10510117. @inproceedings{Gurun2008, title = {Front-end CMOS electronics for monolithic integration with CMUT arrays: Circuit design and initial experimental results}, author = {Gokce Gurun and Muhammad Shakeel Qureshi and Mujdat Balantekin and Rasim Guldiken and Jaime Zahorian and Sheng Yu Peng and Arindam Basu and Mustafa Karaman and Paul Hasler and Levent Degertekin}, doi = {10.1109/ULTSYM.2008.0096}, issn = {10510117}, year = {2008}, date = {2008-01-01}, booktitle = {Proceedings - IEEE Ultrasonics Symposium}, abstract = {This paper discusses design of CMOS-ASICs for monolithic integration of CMUT arrays by post-CMOS fabrication. We describe design strategies for monolithic integration and demonstrate the advantages of CMUT-on-CMOS approach. On the same wafer, separate sets of IC cells are designed to interface different types of CMUT arrays for IVUS and ICE applications. Circuit topologies include resistive feedback transimpedance amplifiers on the receiver side, along with multiplexers and buffers. Gains and bandwidths of receiving amplifiers are optimized separately to fit different array specifications such as number of elements, element size and operation bandwidth. To drive CMUTs a high voltage pulser array is designed in the same 3.3V unmodified CMOS technology by combining existing technological layers in an unconventional way. CMUT arrays are then built on top of the custom made 8" wafer containing these circuits fabricated in a 0.35 mum standard CMOS process. We present initial characterization of the CMOS electronics and pulse-echo measurements obtained post-CMOS fabricated CMUT elements.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } This paper discusses design of CMOS-ASICs for monolithic integration of CMUT arrays by post-CMOS fabrication. We describe design strategies for monolithic integration and demonstrate the advantages of CMUT-on-CMOS approach. On the same wafer, separate sets of IC cells are designed to interface different types of CMUT arrays for IVUS and ICE applications. Circuit topologies include resistive feedback transimpedance amplifiers on the receiver side, along with multiplexers and buffers. Gains and bandwidths of receiving amplifiers are optimized separately to fit different array specifications such as number of elements, element size and operation bandwidth. To drive CMUTs a high voltage pulser array is designed in the same 3.3V unmodified CMOS technology by combining existing technological layers in an unconventional way. CMUT arrays are then built on top of the custom made 8" wafer containing these circuits fabricated in a 0.35 mum standard CMOS process. We present initial characterization of the CMOS electronics and pulse-echo measurements obtained post-CMOS fabricated CMUT elements. |
Basturk, Ilhan; Ozbek, Berna Pilot-based iterative channel estimation for OFDM systems Inproceedings 2008. @inproceedings{Basturk2008, title = {Pilot-based iterative channel estimation for OFDM systems}, author = {Ilhan Basturk and Berna Ozbek}, doi = {10.1109/siu.2008.4632584}, year = {2008}, date = {2008-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Altinkaya, Mustafa A; Anarim, Emin; Sankur, Bülent Phase dependence mitigation for autocorrelation-based frequency estimation Journal Article Digital Signal Processing: A Review Journal, 2008, ISSN: 10512004. @article{Altinkaya2008, title = {Phase dependence mitigation for autocorrelation-based frequency estimation}, author = {Mustafa A Altinkaya and Emin Anarim and Bülent Sankur}, doi = {10.1016/j.dsp.2007.02.004}, issn = {10512004}, year = {2008}, date = {2008-01-01}, journal = {Digital Signal Processing: A Review Journal}, abstract = {The sinusoidal frequency estimation from short data records based on Toeplitz autocorrelation (AC) matrix estimates suffer from the dependence on the initial phases of the sinusoid(s). This effect becomes prominent when the impact of additive noise vanishes, that is at high signal-to-noise ratios (SNR). Based on both analytic derivation of the AC lag terms and simulation experiments we show that data windowing can mitigate the limitations caused by the phase dependence. Thus with proper windowing, the variance of the frequency estimate is no more eclipsed by phase dependence, but it continues to decrease linearly with increasing SNR. The study covers both the cases of a single sinusoid and two sinusoids closely spaced in the frequency with the Pisarenko frequency estimator, MUSIC and principal component autoregressive frequency estimators. The trade-offs between the spectral broadening and the achieved minimum variance level due to the data window are analyzed in detail. textcopyright 2007 Elsevier Inc. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The sinusoidal frequency estimation from short data records based on Toeplitz autocorrelation (AC) matrix estimates suffer from the dependence on the initial phases of the sinusoid(s). This effect becomes prominent when the impact of additive noise vanishes, that is at high signal-to-noise ratios (SNR). Based on both analytic derivation of the AC lag terms and simulation experiments we show that data windowing can mitigate the limitations caused by the phase dependence. Thus with proper windowing, the variance of the frequency estimate is no more eclipsed by phase dependence, but it continues to decrease linearly with increasing SNR. The study covers both the cases of a single sinusoid and two sinusoids closely spaced in the frequency with the Pisarenko frequency estimator, MUSIC and principal component autoregressive frequency estimators. The trade-offs between the spectral broadening and the achieved minimum variance level due to the data window are analyzed in detail. textcopyright 2007 Elsevier Inc. All rights reserved. |
Tatlicioglu, E; McIntyre, ML; Dawson, DM; Walker, LD Adaptive non-linear tracking control of kinematically redundant robot manipulators Journal Article International Journal of Robotics and Automation, 23 (2), pp. 98–105, 2008. @article{pop00012c, title = {Adaptive non-linear tracking control of kinematically redundant robot manipulators}, author = {E Tatlicioglu and ML McIntyre and DM Dawson and LD Walker}, year = {2008}, date = {2008-01-01}, journal = {International Journal of Robotics and Automation}, volume = {23}, number = {2}, pages = {98--105}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
F, ON Savaci Acar "The System Modelling and Circuit Implementation from Time-Frequency Domain Signal Specifications" Journal Article AEU International Journal of Electronics and Communications, 62 (8), pp. 565–575, 2008. @article{pop00019bb, title = {"The System Modelling and Circuit Implementation from Time-Frequency Domain Signal Specifications"}, author = {ON Savaci Acar F}, year = {2008}, date = {2008-01-01}, journal = {AEU International Journal of Electronics and Communications}, volume = {62}, number = {8}, pages = {565--575}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Lee, DB; Tatlicioglu, E; Burg, TC; Dawson, DM Robust output tracking control of a surface vessel Journal Article 2008 American Control Conference, pp. 544–549, 2008. @article{pop00021c, title = {Robust output tracking control of a surface vessel}, author = {DB Lee and E Tatlicioglu and TC Burg and DM Dawson}, year = {2008}, date = {2008-01-01}, journal = {2008 American Control Conference}, pages = {544--549}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Lee, Dong Bin; Tatlicioglu, Enver; Burg, Timothy C; Dawson, Darren M Adaptive output tracking control of a surface vessel Inproceedings Proceedings of the IEEE Conference on Decision and Control, 2008, ISSN: 01912216. @inproceedings{Lee2008, title = {Adaptive output tracking control of a surface vessel}, author = {Dong Bin Lee and Enver Tatlicioglu and Timothy C Burg and Darren M Dawson}, doi = {10.1109/CDC.2008.4739313}, issn = {01912216}, year = {2008}, date = {2008-01-01}, booktitle = {Proceedings of the IEEE Conference on Decision and Control}, abstract = {In this paper, the tracking control of a three degree-of-freedom marine vessel is examined. The novelty of this work is the transformation of the asymmetric inertia matrix into a symmetric, positive definite matrix. The asymmetry arises from the added mass common to practical surface vessels and creates a significant challenge for control design. The control design is further complicated by the parametric uncertainties in the dynamic model of the vessel. Two adaptive control schemes with a projection-based adaptation law are proposed: a full-state feedback controller and an output feedback controller. Both controllers are known to yield a uniformly ultimately bounded tracking result in the presence of parametric uncertainty. Numerical simulation results are shown to demonstrate the validity of the proposed controllers.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } In this paper, the tracking control of a three degree-of-freedom marine vessel is examined. The novelty of this work is the transformation of the asymmetric inertia matrix into a symmetric, positive definite matrix. The asymmetry arises from the added mass common to practical surface vessels and creates a significant challenge for control design. The control design is further complicated by the parametric uncertainties in the dynamic model of the vessel. Two adaptive control schemes with a projection-based adaptation law are proposed: a full-state feedback controller and an output feedback controller. Both controllers are known to yield a uniformly ultimately bounded tracking result in the presence of parametric uncertainty. Numerical simulation results are shown to demonstrate the validity of the proposed controllers. |
Gumustekin, Sevket; Topal, Ali; Sengoz, Burak Texture analysis on modified bitumen images using Gabor features Inproceedings 2008. @inproceedings{Gumustekin2008, title = {Texture analysis on modified bitumen images using Gabor features}, author = {Sevket Gumustekin and Ali Topal and Burak Sengoz}, doi = {10.1109/siu.2008.4632627}, year = {2008}, date = {2008-01-01}, abstract = {The bitumen which is an irreplaceable material of construction industry, especially in transportation, has become a primary field ofresearch with the improvements in material science technologies, in order to build more robust and reliable roads and buildings. It has become a standard procedure to add several types of materials into the bitumen. Testing the modified bitumen is extermely important to maintain high quality and to inspect malpractice during construction. In this work a new method is presented which is an alternative to mechanical methods. Textural properties of modified bitumen images are investigated, and it was observed that it is possible to identify what type ofmaterial is added to the bitumen at what percentage. textcopyright2008 IEEE.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } The bitumen which is an irreplaceable material of construction industry, especially in transportation, has become a primary field ofresearch with the improvements in material science technologies, in order to build more robust and reliable roads and buildings. It has become a standard procedure to add several types of materials into the bitumen. Testing the modified bitumen is extermely important to maintain high quality and to inspect malpractice during construction. In this work a new method is presented which is an alternative to mechanical methods. Textural properties of modified bitumen images are investigated, and it was observed that it is possible to identify what type ofmaterial is added to the bitumen at what percentage. textcopyright2008 IEEE. |
Kapadia, Apoorva; Tatlicioglu, Enver; Dawson, Darren M Set-point navigation of a redundant robot in uncertain environments using finite range sensors Inproceedings Proceedings of the IEEE Conference on Decision and Control, 2008, ISSN: 01912216. @inproceedings{Kapadia2008, title = {Set-point navigation of a redundant robot in uncertain environments using finite range sensors}, author = {Apoorva Kapadia and Enver Tatlicioglu and Darren M Dawson}, doi = {10.1109/CDC.2008.4739225}, issn = {01912216}, year = {2008}, date = {2008-01-01}, booktitle = {Proceedings of the IEEE Conference on Decision and Control}, abstract = {In this work, control of redundant robot manipulators in an uncertain environment is considered. The manipulator is equipped with finite range sensors to detect obstacles in its workspace. A navigation functionbased kinematic controller is proposed to ensure the regulation of the end-effector to a desired set-point while the entire manipulator simultaneously avoids the obstacle points detected by the sensors. A joint-space controller is then utilized to ensure asymptotic tracking of the desired jointspace trajectory.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } In this work, control of redundant robot manipulators in an uncertain environment is considered. The manipulator is equipped with finite range sensors to detect obstacles in its workspace. A navigation functionbased kinematic controller is proposed to ensure the regulation of the end-effector to a desired set-point while the entire manipulator simultaneously avoids the obstacle points detected by the sensors. A joint-space controller is then utilized to ensure asymptotic tracking of the desired jointspace trajectory. |
Ozbek, Erdal M; Savaci, Acar F Separation of musical instruments using correntropy Inproceedings 2008. @inproceedings{Ozbek2008b, title = {Separation of musical instruments using correntropy}, author = {Erdal M Ozbek and Acar F Savaci}, doi = {10.1109/siu.2008.4632652}, year = {2008}, date = {2008-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Ozbakis, Basak; Kustepeli, Alp The resonant behavior of the fibonacci fractal tree antennas Journal Article Microwave and Optical Technology Letters, 2008, ISSN: 08952477. @article{Ozbakis2008, title = {The resonant behavior of the fibonacci fractal tree antennas}, author = {Basak Ozbakis and Alp Kustepeli}, doi = {10.1002/mop.23299}, issn = {08952477}, year = {2008}, date = {2008-01-01}, journal = {Microwave and Optical Technology Letters}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Bechteler, Thomas F; Kustepeli, Alp; Bechteler, Sevinc A Design of coupling structures for groove guide resonators Journal Article Microwave and Optical Technology Letters, 2008, ISSN: 08952477. @article{Bechteler2008, title = {Design of coupling structures for groove guide resonators}, author = {Thomas F Bechteler and Alp Kustepeli and Sevinc A Bechteler}, doi = {10.1002/mop.23372}, issn = {08952477}, year = {2008}, date = {2008-01-01}, journal = {Microwave and Optical Technology Letters}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Atakan, Baris; Akan, Ozgur B On channel capacity and error compensation in molecular communication Inproceedings Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 2008, ISSN: 03029743. @inproceedings{Atakan2008, title = {On channel capacity and error compensation in molecular communication}, author = {Baris Atakan and Ozgur B Akan}, doi = {10.1007/978-3-540-92273-5-4}, issn = {03029743}, year = {2008}, date = {2008-01-01}, booktitle = {Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)}, abstract = {Molecular communication is a novel paradigm that uses molecules as an information carrier to enable nanomachines to communicate with each other. Controlled molecule delivery between two nanomachines is one of the most important challenges which must be addressed to enable the molecular communication. Therefore, it is essential to develop an information theoretical approach to find out communication capacity of the molecular channel. In this paper, we develop an information theoretical approach for capacity of a molecular channel between two nanomachines. Using the principles of mass action kinetics, we first introduce a molecule delivery model for the molecular communication between two nanomachines called as Transmitter Nanomachine (TN) and Receiver Nanomachine (RN). Then, we derive a closed form expression for capacity of the channel between TN and RN. Furthermore, we propose an adaptive Molecular Error Compensation (MEC) scheme for the molecular communication between TN and RN. MEC allows TN to select an appropriate molecular bit transmission probability to maximize molecular communication capacity with respect to environmental factors such as temperature and distance between nanomachines. Numerical analysis show that selecting appropriate molecular communication parameters such as concentration of emitted molecules, duration of molecule emission, and molecular bit transmission probability it can be possible to achieve high molecular communication capacity for the molecular communication channel between two nanomachines. Moreover, the numerical analysis reveals that MEC provides more than % 100 capacity improvement in the molecular communication selecting the most appropriate molecular transmission probability.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } Molecular communication is a novel paradigm that uses molecules as an information carrier to enable nanomachines to communicate with each other. Controlled molecule delivery between two nanomachines is one of the most important challenges which must be addressed to enable the molecular communication. Therefore, it is essential to develop an information theoretical approach to find out communication capacity of the molecular channel. In this paper, we develop an information theoretical approach for capacity of a molecular channel between two nanomachines. Using the principles of mass action kinetics, we first introduce a molecule delivery model for the molecular communication between two nanomachines called as Transmitter Nanomachine (TN) and Receiver Nanomachine (RN). Then, we derive a closed form expression for capacity of the channel between TN and RN. Furthermore, we propose an adaptive Molecular Error Compensation (MEC) scheme for the molecular communication between TN and RN. MEC allows TN to select an appropriate molecular bit transmission probability to maximize molecular communication capacity with respect to environmental factors such as temperature and distance between nanomachines. Numerical analysis show that selecting appropriate molecular communication parameters such as concentration of emitted molecules, duration of molecule emission, and molecular bit transmission probability it can be possible to achieve high molecular communication capacity for the molecular communication channel between two nanomachines. Moreover, the numerical analysis reveals that MEC provides more than % 100 capacity improvement in the molecular communication selecting the most appropriate molecular transmission probability. |
Atakan, B; Akan, OB On molecular multiple-access, broadcast, and relay channels in nanonetworks Journal Article Proceedings of the 3rd International Conference on Bio-Inspired Models of …, 2008. @article{pop00009c, title = {On molecular multiple-access, broadcast, and relay channels in nanonetworks}, author = {B Atakan and OB Akan}, year = {2008}, date = {2008-01-01}, journal = {Proceedings of the 3rd International Conference on Bio-Inspired Models of …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Tatlicioglu, E Control of Nonlinear Mechatronic Systems: Control and Modeling of Nonlinear Systems with Applications in Robotics Book VDM Publishing, 2008. @book{pop00104, title = {Control of Nonlinear Mechatronic Systems: Control and Modeling of Nonlinear Systems with Applications in Robotics}, author = {E Tatlicioglu}, year = {2008}, date = {2008-01-01}, publisher = {VDM Publishing}, keywords = {}, pubstate = {published}, tppubtype = {book} } |
2007 |
Yaman, F; Simçsek, S Neural network approach to determine nonsmooth one‐dimensional profiles in inverse scattering theory Journal Article Microwave and Optical Technology Letters, 49 (12), pp. 3158–3162, 2007. @article{pop00007bb, title = {Neural network approach to determine nonsmooth one‐dimensional profiles in inverse scattering theory}, author = {F Yaman and S Simçsek}, year = {2007}, date = {2007-01-01}, journal = {Microwave and Optical Technology Letters}, volume = {49}, number = {12}, pages = {3158--3162}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yuksel, K; Letheux, S; Grillet, A; Wuilpart, M; Giannone, D; Hancqe, J; ..., Centralised optical monitoring of tree-structured passive optical networks using a Raman-assisted OTDR Journal Article 2007 9th International Conference on Transparent Optical Networks, 1 , pp. 175–178, 2007. @article{pop00007c, title = {Centralised optical monitoring of tree-structured passive optical networks using a Raman-assisted OTDR}, author = {K Yuksel and S Letheux and A Grillet and M Wuilpart and D Giannone and J Hancqe and ...}, year = {2007}, date = {2007-01-01}, journal = {2007 9th International Conference on Transparent Optical Networks}, volume = {1}, pages = {175--178}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ruyet, Didier Le; Özbek, Berna Partial and analog feedback for MISO precoding systems Inproceedings IEEE International Conference on Communications, 2007, ISSN: 05361486. @inproceedings{LeRuyet2007, title = {Partial and analog feedback for MISO precoding systems}, author = {Didier Le Ruyet and Berna Özbek}, doi = {10.1109/ICC.2007.460}, issn = {05361486}, year = {2007}, date = {2007-01-01}, booktitle = {IEEE International Conference on Communications}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Wuilpart, M; Grillet, A; Yuksel, K; Gianone, D; Ravet, G; Megret, P Dynamics enhancement of OTDR-based monitoring systems for passive optical networks Journal Article Proceedings Symposium IEEE/LEOS Benelux Chapter, Brussels, pp. 167–170, 2007. @article{pop00010c, title = {Dynamics enhancement of OTDR-based monitoring systems for passive optical networks}, author = {M Wuilpart and A Grillet and K Yuksel and D Gianone and G Ravet and P Megret}, year = {2007}, date = {2007-01-01}, journal = {Proceedings Symposium IEEE/LEOS Benelux Chapter, Brussels}, pages = {167--170}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yüksel, K; Wuilpart, M; Mégret, P Optical-frequency domain reflectometry: roadmap for high-resolution distributed measurements Journal Article Proceedings of the IEEE Laser and Electro-Optics Society Symposium-Benelux …, 2007. @article{pop00011d, title = {Optical-frequency domain reflectometry: roadmap for high-resolution distributed measurements}, author = {K Yüksel and M Wuilpart and P Mégret}, year = {2007}, date = {2007-01-01}, journal = {Proceedings of the IEEE Laser and Electro-Optics Society Symposium-Benelux …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Baştürk, İ Iterative channel estimation techniques for multiple input multiple output orthogonal frequency division multiplexing systems Journal Article İzmir Institute of Technology, 2007. @article{pop00040b, title = {Iterative channel estimation techniques for multiple input multiple output orthogonal frequency division multiplexing systems}, author = {İ Baştürk}, year = {2007}, date = {2007-01-01}, journal = {İzmir Institute of Technology}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Basturk, Ilhan; Ozbek, Berna Performance of Pilot-Based EM Channel Estimation for OFDM Systems Inproceedings 2007. @inproceedings{Basturk2007, title = {Performance of Pilot-Based EM Channel Estimation for OFDM Systems}, author = {Ilhan Basturk and Berna Ozbek}, doi = {10.1109/siu.2007.4298631}, year = {2007}, date = {2007-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Ruyet, Le D; Özbek, B; Khiari, H Performance of multicast MISO–OFDM systems Journal Article Proc of 13th European wireless conference, Paris, 2007. @article{pop00071, title = {Performance of multicast MISO–OFDM systems}, author = {Le D Ruyet and B Özbek and H Khiari}, year = {2007}, date = {2007-01-01}, journal = {Proc of 13th European wireless conference, Paris}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Guldiken, Rasim O; Zahorian, Jaime; Balantekin, Mujdat; Degertekin, Levent F Design and experimental characterization of a dual-electrode CMUT array for intra-cardiac ultrasound Imaging Inproceedings Proceedings - IEEE Ultrasonics Symposium, 2007, ISSN: 10510117. @inproceedings{Guldiken2007, title = {Design and experimental characterization of a dual-electrode CMUT array for intra-cardiac ultrasound Imaging}, author = {Rasim O Guldiken and Jaime Zahorian and Mujdat Balantekin and Levent F Degertekin}, doi = {10.1109/ULTSYM.2007.113}, issn = {10510117}, year = {2007}, date = {2007-01-01}, booktitle = {Proceedings - IEEE Ultrasonics Symposium}, abstract = {A 1-D dual-electrode CMUT array for intracardiac echocardiography with a center frequency of 8 MHz has been designed and fabricated. Total transduction performance increase of 15.7dB is obtained (9dB in receive, 6.7dB in transmit) by using dual electrode configuration making CMUTs more competitive with piezoelectric transducers for a wide range of applications. This improvement is verified both with experiments and simulations. A net peak output pressure of 1.6MPa on the dual-electrode membrane with tone burst excitation at 12MHz is reported. In addition, dynamic biasing is demonstrated to increase the dual electrode CMUT performance. Finally the comparison of dual electrode and conventional CMUT is demonstrated with tissue mimicking phantom. Dual electrode CMUT showed 13dB more SNR even though the electrode size was optimized for conventional configuration.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } A 1-D dual-electrode CMUT array for intracardiac echocardiography with a center frequency of 8 MHz has been designed and fabricated. Total transduction performance increase of 15.7dB is obtained (9dB in receive, 6.7dB in transmit) by using dual electrode configuration making CMUTs more competitive with piezoelectric transducers for a wide range of applications. This improvement is verified both with experiments and simulations. A net peak output pressure of 1.6MPa on the dual-electrode membrane with tone burst excitation at 12MHz is reported. In addition, dynamic biasing is demonstrated to increase the dual electrode CMUT performance. Finally the comparison of dual electrode and conventional CMUT is demonstrated with tissue mimicking phantom. Dual electrode CMUT showed 13dB more SNR even though the electrode size was optimized for conventional configuration. |
Zahorian, Jaime; Guldiken, Rasim; Gurun, Gokce; Qureshi, Shakeel M; Balantekin, Mujdat; Degertekin, Levent F; Carlier, Stephane; Sisman, Alper; Karaman, Mustafa Annular CMUT arrays for side looking intravascular ultrasound imaging Inproceedings Proceedings - IEEE Ultrasonics Symposium, 2007, ISSN: 10510117. @inproceedings{Zahorian2007, title = {Annular CMUT arrays for side looking intravascular ultrasound imaging}, author = {Jaime Zahorian and Rasim Guldiken and Gokce Gurun and Shakeel M Qureshi and Mujdat Balantekin and Levent F Degertekin and Stephane Carlier and Alper Sisman and Mustafa Karaman}, doi = {10.1109/ULTSYM.2007.34}, issn = {10510117}, year = {2007}, date = {2007-01-01}, booktitle = {Proceedings - IEEE Ultrasonics Symposium}, abstract = {Although side looking intravascular ultrasound (SL-IVUS) imaging systems using single element piezoelectric transducers set the resolution standard in the assessment of the extent of coronary artery disease, improvements in transducer performance are needed to perform harmonic imaging and high resolution imaging of vulnerable plaque. With their small channel count, annular arrays exploiting the inherent broad bandwidth of CMUTs and electronic focusing capability of integrated electronics provide a path for desired SL-IVUS imaging catheters. In this paper, we first describe the design, low temperature fabrication of an 840$mu$m diameter, 8 element CMUT annular array. Testing of the individual elements in oil shows a uniform device behavior with 100% fractional bandwidth around 20MHz without including the effects of attenuation and diffraction. We also present linear scan imaging results obtained on wire targets in oil, tissue and tissue mimicking phantoms using both unfocused and dynamically focused transducers. The results for axial and lateral resolution are in agreement predicted by the simulations and show the feasibility of this approach for high resolution SL-IVUS imaging. textcopyright 2007 IEEE.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } Although side looking intravascular ultrasound (SL-IVUS) imaging systems using single element piezoelectric transducers set the resolution standard in the assessment of the extent of coronary artery disease, improvements in transducer performance are needed to perform harmonic imaging and high resolution imaging of vulnerable plaque. With their small channel count, annular arrays exploiting the inherent broad bandwidth of CMUTs and electronic focusing capability of integrated electronics provide a path for desired SL-IVUS imaging catheters. In this paper, we first describe the design, low temperature fabrication of an 840$mu$m diameter, 8 element CMUT annular array. Testing of the individual elements in oil shows a uniform device behavior with 100% fractional bandwidth around 20MHz without including the effects of attenuation and diffraction. We also present linear scan imaging results obtained on wire targets in oil, tissue and tissue mimicking phantoms using both unfocused and dynamically focused transducers. The results for axial and lateral resolution are in agreement predicted by the simulations and show the feasibility of this approach for high resolution SL-IVUS imaging. textcopyright 2007 IEEE. |
Ruyet, Le D; Ozbek, B; Khanfir, H Etude des performances des systemes de communication MISO avec voie de retour Journal Article 21° Colloque GRETSI, Troyes, FRA, 11-14 septembre, 2007 , 2007. @article{pop00098, title = {Etude des performances des systemes de communication MISO avec voie de retour}, author = {Le D Ruyet and B Ozbek and H Khanfir}, year = {2007}, date = {2007-01-01}, journal = {21° Colloque GRETSI, Troyes, FRA, 11-14 septembre}, volume = {2007}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Karacali, Bilge; Tözeren, Aydin Automated detection of regions of interest for tissue microarray experiments: An image texture analysis Journal Article BMC Medical Imaging, 2007, ISSN: 14712342. @article{Karacali2007, title = {Automated detection of regions of interest for tissue microarray experiments: An image texture analysis}, author = {Bilge Karacali and Aydin Tözeren}, doi = {10.1186/1471-2342-7-2}, issn = {14712342}, year = {2007}, date = {2007-01-01}, journal = {BMC Medical Imaging}, abstract = {BACKGROUND: Recent research with tissue microarrays led to a rapid progress toward quantifying the expressions of large sets of biomarkers in normal and diseased tissue. However, standard procedures for sampling tissue for molecular profiling have not yet been established. METHODS: This study presents a high throughput analysis of texture heterogeneity on breast tissue images for the purpose of identifying regions of interest in the tissue for molecular profiling via tissue microarray technology. Image texture of breast histology slides was described in terms of three parameters: the percentage of area occupied in an image block by chromatin (B), percentage occupied by stroma-like regions (P), and a statistical heterogeneity index H commonly used in image analysis. Texture parameters were defined and computed for each of the thousands of image blocks in our dataset using both the gray scale and color segmentation. The image blocks were then classified into three categories using the texture feature parameters in a novel statistical learning algorithm. These categories are as follows: image blocks specific to normal breast tissue, blocks specific to cancerous tissue, and those image blocks that are non-specific to normal and disease states. RESULTS: Gray scale and color segmentation techniques led to identification of same regions in histology slides as cancer-specific. Moreover the image blocks identified as cancer-specific belonged to those cell crowded regions in whole section image slides that were marked by two pathologists as regions of interest for further histological studies. CONCLUSION: These results indicate the high efficiency of our automated method for identifying pathologic regions of interest on histology slides. Automation of critical region identification will help minimize the inter-rater variability among different raters (pathologists) as hundreds of tumors that are used to develop an array have typically been evaluated (graded) by different pathologists. The region of interest information gathered from the whole section images will guide the excision of tissue for constructing tissue microarrays and for high throughput profiling of global gene expression.}, keywords = {}, pubstate = {published}, tppubtype = {article} } BACKGROUND: Recent research with tissue microarrays led to a rapid progress toward quantifying the expressions of large sets of biomarkers in normal and diseased tissue. However, standard procedures for sampling tissue for molecular profiling have not yet been established. METHODS: This study presents a high throughput analysis of texture heterogeneity on breast tissue images for the purpose of identifying regions of interest in the tissue for molecular profiling via tissue microarray technology. Image texture of breast histology slides was described in terms of three parameters: the percentage of area occupied in an image block by chromatin (B), percentage occupied by stroma-like regions (P), and a statistical heterogeneity index H commonly used in image analysis. Texture parameters were defined and computed for each of the thousands of image blocks in our dataset using both the gray scale and color segmentation. The image blocks were then classified into three categories using the texture feature parameters in a novel statistical learning algorithm. These categories are as follows: image blocks specific to normal breast tissue, blocks specific to cancerous tissue, and those image blocks that are non-specific to normal and disease states. RESULTS: Gray scale and color segmentation techniques led to identification of same regions in histology slides as cancer-specific. Moreover the image blocks identified as cancer-specific belonged to those cell crowded regions in whole section image slides that were marked by two pathologists as regions of interest for further histological studies. CONCLUSION: These results indicate the high efficiency of our automated method for identifying pathologic regions of interest on histology slides. Automation of critical region identification will help minimize the inter-rater variability among different raters (pathologists) as hundreds of tumors that are used to develop an array have typically been evaluated (graded) by different pathologists. The region of interest information gathered from the whole section images will guide the excision of tissue for constructing tissue microarrays and for high throughput profiling of global gene expression. |
Karacali, Bilge Information theoretic deformable registration using local image information Journal Article International Journal of Computer Vision, 2007, ISSN: 09205691. @article{Karacali2007a, title = {Information theoretic deformable registration using local image information}, author = {Bilge Karacali}, doi = {10.1007/s11263-006-8704-0}, issn = {09205691}, year = {2007}, date = {2007-01-01}, journal = {International Journal of Computer Vision}, abstract = {We present a deformable registration algorithm for multi-modality images based on information theoretic similarity measures at the scale of individual image voxels. We derive analytical expressions for the mutual information, the joint entropy, and the sum of marginal entropies of two images over a small neighborhood in terms of image gradients. Using these expressions, we formulate image registration algorithms maximizing local similarity over the whole image domain in an energy minimization framework. This strategy produces highly elastic image alignment as the registration is driven by voxel similarities between the images, the algorithms are easily implementable using the closed-form expressions for the derivative of the optimization function with respect to the deformation, and avoid estimation of joint and marginal probability densities governing the image intensities essential to conventional information theoretic image registration methods.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We present a deformable registration algorithm for multi-modality images based on information theoretic similarity measures at the scale of individual image voxels. We derive analytical expressions for the mutual information, the joint entropy, and the sum of marginal entropies of two images over a small neighborhood in terms of image gradients. Using these expressions, we formulate image registration algorithms maximizing local similarity over the whole image domain in an energy minimization framework. This strategy produces highly elastic image alignment as the registration is driven by voxel similarities between the images, the algorithms are easily implementable using the closed-form expressions for the derivative of the optimization function with respect to the deformation, and avoid estimation of joint and marginal probability densities governing the image intensities essential to conventional information theoretic image registration methods. |
Karacali, Bilge; Vamvakidou, Alexandra P; Tözeren, Aydin Automated recognition of cell phenotypes in histology images based on membrane- and nuclei-targeting biomarkers. Journal Article BMC medical imaging, 2007, ISSN: 14712342. @article{Karacali2007b, title = {Automated recognition of cell phenotypes in histology images based on membrane- and nuclei-targeting biomarkers.}, author = {Bilge Karacali and Alexandra P Vamvakidou and Aydin Tözeren}, doi = {10.1186/1471-2342-7-7}, issn = {14712342}, year = {2007}, date = {2007-01-01}, journal = {BMC medical imaging}, abstract = {BACKGROUND: Three-dimensional in vitro culture of cancer cells are used to predict the effects of prospective anti-cancer drugs in vivo. In this study, we present an automated image analysis protocol for detailed morphological protein marker profiling of tumoroid cross section images.$backslash$n$backslash$nMETHODS: Histologic cross sections of breast tumoroids developed in co-culture suspensions of breast cancer cell lines, stained for E-cadherin and progesterone receptor, were digitized and pixels in these images were classified into five categories using k-means clustering. Automated segmentation was used to identify image regions composed of cells expressing a given biomarker. Synthesized images were created to check the accuracy of the image processing system.$backslash$n$backslash$nRESULTS: Accuracy of automated segmentation was over 95% in identifying regions of interest in synthesized images. Image analysis of adjacent histology slides stained, respectively, for Ecad and PR, accurately predicted regions of different cell phenotypes. Image analysis of tumoroid cross sections from different tumoroids obtained under the same co-culture conditions indicated the variation of cellular composition from one tumoroid to another. Variations in the compositions of cross sections obtained from the same tumoroid were established by parallel analysis of Ecad and PR-stained cross section images.$backslash$n$backslash$nCONCLUSION: Proposed image analysis methods offer standardized high throughput profiling of molecular anatomy of tumoroids based on both membrane and nuclei markers that is suitable to rapid large scale investigations of anti-cancer compounds for drug development.}, keywords = {}, pubstate = {published}, tppubtype = {article} } BACKGROUND: Three-dimensional in vitro culture of cancer cells are used to predict the effects of prospective anti-cancer drugs in vivo. In this study, we present an automated image analysis protocol for detailed morphological protein marker profiling of tumoroid cross section images.$backslash$n$backslash$nMETHODS: Histologic cross sections of breast tumoroids developed in co-culture suspensions of breast cancer cell lines, stained for E-cadherin and progesterone receptor, were digitized and pixels in these images were classified into five categories using k-means clustering. Automated segmentation was used to identify image regions composed of cells expressing a given biomarker. Synthesized images were created to check the accuracy of the image processing system.$backslash$n$backslash$nRESULTS: Accuracy of automated segmentation was over 95% in identifying regions of interest in synthesized images. Image analysis of adjacent histology slides stained, respectively, for Ecad and PR, accurately predicted regions of different cell phenotypes. Image analysis of tumoroid cross sections from different tumoroids obtained under the same co-culture conditions indicated the variation of cellular composition from one tumoroid to another. Variations in the compositions of cross sections obtained from the same tumoroid were established by parallel analysis of Ecad and PR-stained cross section images.$backslash$n$backslash$nCONCLUSION: Proposed image analysis methods offer standardized high throughput profiling of molecular anatomy of tumoroids based on both membrane and nuclei markers that is suitable to rapid large scale investigations of anti-cancer compounds for drug development. |
Gormley, Michael; Dampier, William; Ertel, Adam; Karacali, Bilge; Tozeren, Aydin Prediction potential of candidate biomarker sets identified and validated on gene expression data from multiple datasets Journal Article BMC Bioinformatics, 2007, ISSN: 14712105. @article{Gormley2007, title = {Prediction potential of candidate biomarker sets identified and validated on gene expression data from multiple datasets}, author = {Michael Gormley and William Dampier and Adam Ertel and Bilge Karacali and Aydin Tozeren}, doi = {10.1186/1471-2105-8-415}, issn = {14712105}, year = {2007}, date = {2007-01-01}, journal = {BMC Bioinformatics}, abstract = {Background: Independently derived expression profiles of the same biological condition often have few genes in common. In this study, we created populations of expression profiles from publicly available microarray datasets of cancer (breast, lymphoma and renal) samples linked to clinical information with an iterative machine learning algorithm. ROC curves were used to assess the prediction error of each profile for classification. We compared the prediction error of profiles correlated with molecular phenotype against profiles correlated with relapse-free status. Prediction error of profiles identified with supervised univariate feature selection algorithms were compared to profiles selected randomly from a) all genes on the microarray platform and b) a list of known disease-related genes (a priori selection). We also determined the relevance of expression profiles on test arrays from independent datasets, measured on either the same or different microarray platforms. Results: Highly discriminative expression profiles were produced on both simulated gene expression data and expression data from breast cancer and lymphoma datasets on the basis of ER and BCL-6 expression, respectively. Use of relapse -free status to identify profiles for prognosis prediction resulted in poorly discriminative decision rules. Supervised feature selection resulted in more accurate classifications than random or a priori selection, however, the difference in prediction error decreased as the number of features increased. These results held when decision rules were applied across-datasets to samples profiled on the same microarray platform. Conclusion: Our results show that many gene sets predict molecular phenotypes accurately. Given this, expression profiles identified using different training datasets should be expected to show little agreement. In addition, we demonstrate the difficulty in predicting relapse directly from microarray data using supervised machine learning approaches. These findings are relevant to the use of molecular profiling for the identification of candidate biomarker panels. textcopyright 2007 Gormley et al; licensee BioMed Central Ltd.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Background: Independently derived expression profiles of the same biological condition often have few genes in common. In this study, we created populations of expression profiles from publicly available microarray datasets of cancer (breast, lymphoma and renal) samples linked to clinical information with an iterative machine learning algorithm. ROC curves were used to assess the prediction error of each profile for classification. We compared the prediction error of profiles correlated with molecular phenotype against profiles correlated with relapse-free status. Prediction error of profiles identified with supervised univariate feature selection algorithms were compared to profiles selected randomly from a) all genes on the microarray platform and b) a list of known disease-related genes (a priori selection). We also determined the relevance of expression profiles on test arrays from independent datasets, measured on either the same or different microarray platforms. Results: Highly discriminative expression profiles were produced on both simulated gene expression data and expression data from breast cancer and lymphoma datasets on the basis of ER and BCL-6 expression, respectively. Use of relapse -free status to identify profiles for prognosis prediction resulted in poorly discriminative decision rules. Supervised feature selection resulted in more accurate classifications than random or a priori selection, however, the difference in prediction error decreased as the number of features increased. These results held when decision rules were applied across-datasets to samples profiled on the same microarray platform. Conclusion: Our results show that many gene sets predict molecular phenotypes accurately. Given this, expression profiles identified using different training datasets should be expected to show little agreement. In addition, we demonstrate the difficulty in predicting relapse directly from microarray data using supervised machine learning approaches. These findings are relevant to the use of molecular profiling for the identification of candidate biomarker panels. textcopyright 2007 Gormley et al; licensee BioMed Central Ltd. |
Dinleyici, MS; Akin, O Moiré effect analysis in LCD Backlight Modules Journal Article 2007 IEEE 15th Signal Processing and Communications Applications, pp. 1–4, 2007. @article{pop00011e, title = {Moiré effect analysis in LCD Backlight Modules}, author = {MS Dinleyici and O Akin}, year = {2007}, date = {2007-01-01}, journal = {2007 IEEE 15th Signal Processing and Communications Applications}, pages = {1--4}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Tatlicioglu, E; Walker, ID; Dawson, DM Dynamic modelling for planar extensible continuum robot manipulators Journal Article Proceedings 2007 IEEE International Conference on Robotics and Automation …, 2007. @article{pop00001cb, title = {Dynamic modelling for planar extensible continuum robot manipulators}, author = {E Tatlicioglu and ID Walker and DM Dawson}, year = {2007}, date = {2007-01-01}, journal = {Proceedings 2007 IEEE International Conference on Robotics and Automation …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Tatlicioglu, Enver; Walker, Ian D; Dawson, Darren M New dynamic models for planar extensible continuum robot manipulators Inproceedings IEEE International Conference on Intelligent Robots and Systems, 2007, ISBN: 1424409128. @inproceedings{Tatlicioglu2007, title = {New dynamic models for planar extensible continuum robot manipulators}, author = {Enver Tatlicioglu and Ian D Walker and Darren M Dawson}, doi = {10.1109/IROS.2007.4399334}, isbn = {1424409128}, year = {2007}, date = {2007-01-01}, booktitle = {IEEE International Conference on Intelligent Robots and Systems}, abstract = {In this paper, the dynamic model for planar continuum manipulators that was presented in our previous work is extended to include new terms reflecting the effects of potential energy. First the gravitational potential energy of the manipulator is derived. Then, the elastic potential energy of the manipulator is derived for both bending and extension. Finally, the effects of the total potential energy are included in the dynamic model. Numerical simulation results are presented for a planar 3-section extensible continuum robot manipulator. The results show a much stronger match to physical continuum robots than with previously available models.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } In this paper, the dynamic model for planar continuum manipulators that was presented in our previous work is extended to include new terms reflecting the effects of potential energy. First the gravitational potential energy of the manipulator is derived. Then, the elastic potential energy of the manipulator is derived for both bending and extension. Finally, the effects of the total potential energy are included in the dynamic model. Numerical simulation results are presented for a planar 3-section extensible continuum robot manipulator. The results show a much stronger match to physical continuum robots than with previously available models. |
Şimşek, G An approach to summarize video data in compressed domain Journal Article Izmir Institute of Technology, 2007. @article{pop00005f, title = {An approach to summarize video data in compressed domain}, author = {G Şimşek}, year = {2007}, date = {2007-01-01}, journal = {Izmir Institute of Technology}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ozbek, ME; Savaci, FA Music instrument classification using generalized Gaussian density modeling Journal Article 2007 IEEE 15th Signal Processing and Communications Applications, pp. 1–4, 2007. @article{pop00023bb, title = {Music instrument classification using generalized Gaussian density modeling}, author = {ME Ozbek and FA Savaci}, year = {2007}, date = {2007-01-01}, journal = {2007 IEEE 15th Signal Processing and Communications Applications}, pages = {1--4}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Tatlicioglu, E; Xian, B; Dawson, DM; Burg, T Adaptive control of flat mimo nonlinear systems with additive disturbance Journal Article 2007 American Control Conference, pp. 1197–1202, 2007. @article{pop00024c, title = {Adaptive control of flat mimo nonlinear systems with additive disturbance}, author = {E Tatlicioglu and B Xian and DM Dawson and T Burg}, year = {2007}, date = {2007-01-01}, journal = {2007 American Control Conference}, pages = {1197--1202}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Tatlicioglu, Enver; Dawson, Darren M; Xian, Bin Adaptive visual servo regulation control for camera-in-hand configuration with a fixed-camera extension Inproceedings Proceedings of the IEEE Conference on Decision and Control, 2007, ISSN: 01912216. @inproceedings{Tatlicioglu2007b, title = {Adaptive visual servo regulation control for camera-in-hand configuration with a fixed-camera extension}, author = {Enver Tatlicioglu and Darren M Dawson and Bin Xian}, doi = {10.1109/CDC.2007.4434761}, issn = {01912216}, year = {2007}, date = {2007-01-01}, booktitle = {Proceedings of the IEEE Conference on Decision and Control}, abstract = {In this paper, image-based regulation control of a robot manipulator with an uncalibrated vision system is discussed. To compensate for the unknown camera calibration parameters, a novel prediction error formulation is presented. To achieve the control objectives, a Lyapunov-based adaptive control strategy is employed. The control development for the camera-in-hand problem is presented in detail and a fixed-camera problem is included as an extension.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } In this paper, image-based regulation control of a robot manipulator with an uncalibrated vision system is discussed. To compensate for the unknown camera calibration parameters, a novel prediction error formulation is presented. To achieve the control objectives, a Lyapunov-based adaptive control strategy is employed. The control development for the camera-in-hand problem is presented in detail and a fixed-camera problem is included as an extension. |
Tatlicioglu, Enver Control of nonlinear mechatronic systems PhD Thesis 2007, ISBN: 9780549149811. @phdthesis{Tatlicioglu2007a, title = {Control of nonlinear mechatronic systems}, author = {Enver Tatlicioglu}, isbn = {9780549149811}, year = {2007}, date = {2007-01-01}, booktitle = {ProQuest Dissertations and Theses}, abstract = {This dissertation is divided into four self-contained chapters. In Chapter 1, an adaptive nonlinear tracking controller for kinematically redundant robot manipulators is presented. Past research efforts have focused on the end-effector tracking control of redundant robots because of their increased dexterity over their non-redundant counterparts. This work utilizes an adaptive full-state feedback quaternion based controller developed in 1] and focuses on the design of a general sub-task controller. This sub-task controller does not affect the position and orientation tracking control objectives, but instead projects a preference on the configuration of the manipulator based on sub-task objectives such as the following: singularity avoidance, joint limit avoidance, bounding the impact forces, and bounding the potential energy. In Chapter 2, two controllers are developed for nonlinear haptic and teleoperator systems for coordination of the master and slave systems. The first controller is proven to yield a semi-global asymptotic result in the presence of parametric uncertainty in the master and the slave dynamic models provided the user and the environmental input forces are measurable. The second controller yields a global asymptotic result despite unmeasurable user and environmental input forces provided the dynamic models of the master and slave systems are known. These controllers rely on a transformation and a flexible target system to allow the master system's impedance to be easily adjusted so that it matches a desired target system. This work also offers a structure to encode a velocity field assist mechanism to provide the user help in controlling the slave system in completing a pre-defined contour following task. For each controller, Lyapunov-based techniques are used to prove that both controllers provide passive coordination of the haptic/teleoperator system when the velocity field assist mechanism is disabled. When the velocity field assist mechanism is enabled, the analysis proves the coordination of the haptic/teleoperator system. Simulation results are presented for both controllers. In Chapter 3, two controllers are developed for flat multi-input/multi-output nonlinear systems. First, a robust adaptive controller is proposed and proven to yield semi-global asymptotic tracking in the presence of additive disturbances and parametric uncertainty. In addition to guaranteeing an asymptotic output tracking result, it is also proven that the parameter estimate vector is driven to a constant vector. In the second part of the chapter, a learning controller is designed and proven to yield a semi-global asymptotic tracking result in the presence of additive disturbances where the desired trajectory is periodic. A continuous nonlinear integral feedback component is utilized in the design of both controllers and Lyapunov-based techniques are used to guarantee that the tracking error is asymptotically driven to zero. Numerical simulation results are presented for both controllers. In Chapter 4, a new dynamic model for continuum robot manipulators is derived. The dynamic model is developed based on the geometric model of extensible continuum robot manipulators with no torsional effects. The development presented in this chapter is an extension of the dynamic model proposed in 2] (by Mochiyama and Suzuki) to include a class of extensible continuum robot manipulators. First, the kinetic energy of a slice of the continuum robot is evaluated. Next, the total kinetic energy of the manipulator is obtained by utilizing a limit operation (i.e., sum of the kinetic energy of all the slices). Then, the gravitational potential energy of the manipulator is derived. Next, the elastic potential energy of the manipulator is derived for both bending and extension. Finally, the dynamic model of a planar 3-section extensible continuum robot manipulator is derived by utilizing the Lagrange representation. Numerical simulation results are presented for a planar 3-section extensible continuum robot manipulator.}, keywords = {}, pubstate = {published}, tppubtype = {phdthesis} } This dissertation is divided into four self-contained chapters. In Chapter 1, an adaptive nonlinear tracking controller for kinematically redundant robot manipulators is presented. Past research efforts have focused on the end-effector tracking control of redundant robots because of their increased dexterity over their non-redundant counterparts. This work utilizes an adaptive full-state feedback quaternion based controller developed in 1] and focuses on the design of a general sub-task controller. This sub-task controller does not affect the position and orientation tracking control objectives, but instead projects a preference on the configuration of the manipulator based on sub-task objectives such as the following: singularity avoidance, joint limit avoidance, bounding the impact forces, and bounding the potential energy. In Chapter 2, two controllers are developed for nonlinear haptic and teleoperator systems for coordination of the master and slave systems. The first controller is proven to yield a semi-global asymptotic result in the presence of parametric uncertainty in the master and the slave dynamic models provided the user and the environmental input forces are measurable. The second controller yields a global asymptotic result despite unmeasurable user and environmental input forces provided the dynamic models of the master and slave systems are known. These controllers rely on a transformation and a flexible target system to allow the master system's impedance to be easily adjusted so that it matches a desired target system. This work also offers a structure to encode a velocity field assist mechanism to provide the user help in controlling the slave system in completing a pre-defined contour following task. For each controller, Lyapunov-based techniques are used to prove that both controllers provide passive coordination of the haptic/teleoperator system when the velocity field assist mechanism is disabled. When the velocity field assist mechanism is enabled, the analysis proves the coordination of the haptic/teleoperator system. Simulation results are presented for both controllers. In Chapter 3, two controllers are developed for flat multi-input/multi-output nonlinear systems. First, a robust adaptive controller is proposed and proven to yield semi-global asymptotic tracking in the presence of additive disturbances and parametric uncertainty. In addition to guaranteeing an asymptotic output tracking result, it is also proven that the parameter estimate vector is driven to a constant vector. In the second part of the chapter, a learning controller is designed and proven to yield a semi-global asymptotic tracking result in the presence of additive disturbances where the desired trajectory is periodic. A continuous nonlinear integral feedback component is utilized in the design of both controllers and Lyapunov-based techniques are used to guarantee that the tracking error is asymptotically driven to zero. Numerical simulation results are presented for both controllers. In Chapter 4, a new dynamic model for continuum robot manipulators is derived. The dynamic model is developed based on the geometric model of extensible continuum robot manipulators with no torsional effects. The development presented in this chapter is an extension of the dynamic model proposed in 2] (by Mochiyama and Suzuki) to include a class of extensible continuum robot manipulators. First, the kinetic energy of a slice of the continuum robot is evaluated. Next, the total kinetic energy of the manipulator is obtained by utilizing a limit operation (i.e., sum of the kinetic energy of all the slices). Then, the gravitational potential energy of the manipulator is derived. Next, the elastic potential energy of the manipulator is derived for both bending and extension. Finally, the dynamic model of a planar 3-section extensible continuum robot manipulator is derived by utilizing the Lagrange representation. Numerical simulation results are presented for a planar 3-section extensible continuum robot manipulator. |
Simsek, Gokhan; Gumustekin, Sevket An Approach to Detect Scene Cuts in H264/AVC Coded Video Inproceedings 2007. @inproceedings{Simsek2007, title = {An Approach to Detect Scene Cuts in H264/AVC Coded Video}, author = {Gokhan Simsek and Sevket Gumustekin}, doi = {10.1109/siu.2007.4298710}, year = {2007}, date = {2007-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Ozkurt, N; Savaci, FA Extraction of signal component using wavelet ridges Journal Article 2007 IEEE 15th Signal Processing and Communications Applications, pp. 1–4, 2007. @article{pop00039bb, title = {Extraction of signal component using wavelet ridges}, author = {N Ozkurt and FA Savaci}, year = {2007}, date = {2007-01-01}, journal = {2007 IEEE 15th Signal Processing and Communications Applications}, pages = {1--4}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Magri, A; Krol, A; Unlu, M; Lipson, E; Mandel, J; McGraw, W; Lee, W; Coman, I; ..., Nonrigid registration of dynamic breast F-18-FDG PET/CT images using deformable FEM model and CT image warping Journal Article Medical Imaging, 65120D-65120D, 11 , 2007. @article{pop00011f, title = {Nonrigid registration of dynamic breast F-18-FDG PET/CT images using deformable FEM model and CT image warping}, author = {A Magri and A Krol and M Unlu and E Lipson and J Mandel and W McGraw and W Lee and I Coman and ...}, year = {2007}, date = {2007-01-01}, journal = {Medical Imaging, 65120D-65120D}, volume = {11}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
MAGRI, A; KROL, A; UNLU, M; LIPSON, E; MANDEL, J; MCGRAW, W; LEE, W; ..., Nonrigid registration of dynamic-breast F-18-FDG PET Journal Article Progress in biomedical optics and imaging, 8 (31), 2007. @article{pop00017e, title = {Nonrigid registration of dynamic-breast F-18-FDG PET}, author = {A MAGRI and A KROL and M UNLU and E LIPSON and J MANDEL and W MCGRAW and W LEE and ...}, year = {2007}, date = {2007-01-01}, journal = {Progress in biomedical optics and imaging}, volume = {8}, number = {31}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Saynak, Ugur; Kustepeli, Alp A novel square-spiral strip antenna Inproceedings INICA 2007 International Conference on Antennas - Proceedings, 2007, ISBN: 9783000216435. @inproceedings{Saynak2007, title = {A novel square-spiral strip antenna}, author = {Ugur Saynak and Alp Kustepeli}, doi = {10.1109/INICA.2007.4353961}, isbn = {9783000216435}, year = {2007}, date = {2007-01-01}, booktitle = {INICA 2007 International Conference on Antennas - Proceedings}, abstract = {A square-spiral strip antenna is designed considering the procedure used to obtain log-periodic antennas. Simulation results of the new design are compared with those of the well known and widely used Archimedean spiral antenna in terms of the frequency dependency. The effect of dielectric substrate used to support the antennas is also investigated.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } A square-spiral strip antenna is designed considering the procedure used to obtain log-periodic antennas. Simulation results of the new design are compared with those of the well known and widely used Archimedean spiral antenna in terms of the frequency dependency. The effect of dielectric substrate used to support the antennas is also investigated. |
Atakan, B; Akan, OB An information theoretical approach for molecular communication Journal Article 2007 2nd Bio-Inspired Models of Network, Information and Computing Systems …, 2007. @article{pop00003bb, title = {An information theoretical approach for molecular communication}, author = {B Atakan and OB Akan}, year = {2007}, date = {2007-01-01}, journal = {2007 2nd Bio-Inspired Models of Network, Information and Computing Systems …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Atakan, B; Akan, OB Biologically-inspired spectrum sharing in cognitive radio networks Journal Article 2007 IEEE Wireless Communications and Networking Conference, pp. 43–48, 2007. @article{pop00005bb, title = {Biologically-inspired spectrum sharing in cognitive radio networks}, author = {B Atakan and OB Akan}, year = {2007}, date = {2007-01-01}, journal = {2007 IEEE Wireless Communications and Networking Conference}, pages = {43--48}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Atakan, Bariş; Akan, Özgür B Immune system-based energy efficient and reliable communication in wireless sensor networks Journal Article Studies in Computational Intelligence, 2007, ISSN: 1860949X. @article{Atakan2007b, title = {Immune system-based energy efficient and reliable communication in wireless sensor networks}, author = {Bariş Atakan and Özgür B Akan}, doi = {10.1007/978-3-540-72693-7_10}, issn = {1860949X}, year = {2007}, date = {2007-01-01}, journal = {Studies in Computational Intelligence}, abstract = {Wireless sensor networks (WSNs) are event-based systems that rely on the collective effort of densely deployed sensor nodes. Due to the dense deployment, since sensor observations are spatially correlated with respect to location of sensor nodes, it may not be necessary for every sensor node to transmit its data. Therefore, due to the resource constraints of sensor nodes, it is imperative to select the minimum number of sensor nodes to transmit the data to the sink. Furthermore, to achieve the application-specific distortion bound at the sink, it is also of great significance to determine the appropriate sampling frequency of sensor nodes to minimize energy consumption. In order to address these needs, the Distributed Node and Rate Selection (DNRS) algorithm which is based on the principles of natural immune system is developed. Based on the B-cell stimulation in immune system, DNRS selects the most appropriate sensor nodes that send samples of the observed event, i.e., designated nodes. The aim of the designated node selection is to meet the event signal reconstruction distortion constraint at the sink node with the minimum number of sensor nodes. DNRS enables each sensor node to distributively decide whether it is a designated node or not. In addition, to exploit the temporal correlation in the event data DNRS regulates the sampling frequency rate of each sensor node while meeting the application-specific delay bound at the sink. Based on the immune network principles, DNRS distributively selects the appropriate sampling frequencies of sensor nodes according to the congestion in the forward path and the event signal reconstruction distortion periodically calculated at the sink by Adaptive LMS Filter. Performance evaluation shows that DNRS provides the minimum number of designated nodes to reliably reconstruct the event signal and it regulates the sampling frequency of designated nodes to exploit the temporal correlation in the event signal with significant energy saving.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Wireless sensor networks (WSNs) are event-based systems that rely on the collective effort of densely deployed sensor nodes. Due to the dense deployment, since sensor observations are spatially correlated with respect to location of sensor nodes, it may not be necessary for every sensor node to transmit its data. Therefore, due to the resource constraints of sensor nodes, it is imperative to select the minimum number of sensor nodes to transmit the data to the sink. Furthermore, to achieve the application-specific distortion bound at the sink, it is also of great significance to determine the appropriate sampling frequency of sensor nodes to minimize energy consumption. In order to address these needs, the Distributed Node and Rate Selection (DNRS) algorithm which is based on the principles of natural immune system is developed. Based on the B-cell stimulation in immune system, DNRS selects the most appropriate sensor nodes that send samples of the observed event, i.e., designated nodes. The aim of the designated node selection is to meet the event signal reconstruction distortion constraint at the sink node with the minimum number of sensor nodes. DNRS enables each sensor node to distributively decide whether it is a designated node or not. In addition, to exploit the temporal correlation in the event data DNRS regulates the sampling frequency rate of each sensor node while meeting the application-specific delay bound at the sink. Based on the immune network principles, DNRS distributively selects the appropriate sampling frequencies of sensor nodes according to the congestion in the forward path and the event signal reconstruction distortion periodically calculated at the sink by Adaptive LMS Filter. Performance evaluation shows that DNRS provides the minimum number of designated nodes to reliably reconstruct the event signal and it regulates the sampling frequency of designated nodes to exploit the temporal correlation in the event signal with significant energy saving. |
Atakan, B; Akan, ÖB On event signal reconstruction in wireless sensor networks Journal Article International Conference on Research in Networking, pp. 558–569, 2007. @article{pop00020c, title = {On event signal reconstruction in wireless sensor networks}, author = {B Atakan and ÖB Akan}, year = {2007}, date = {2007-01-01}, journal = {International Conference on Research in Networking}, pages = {558--569}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
2006 |
Kahraman, Metin; Gümüştekin, Şevket Matching aerial coastline images with map data using dynamic programming Inproceedings European Signal Processing Conference, 2006, ISSN: 22195491. @inproceedings{Kahraman2006, title = {Matching aerial coastline images with map data using dynamic programming}, author = {Metin Kahraman and Şevket Gümüştekin}, issn = {22195491}, year = {2006}, date = {2006-01-01}, booktitle = {European Signal Processing Conference}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Günel, Serkan; Savaci, Acar F Determination of the stationary state densities of the stochastic nonlinear dynamical systems Journal Article International Journal of Engineering Science, 2006, ISSN: 00207225. @article{Gunel2006, title = {Determination of the stationary state densities of the stochastic nonlinear dynamical systems}, author = {Serkan Günel and Acar F Savaci}, doi = {10.1016/j.ijengsci.2006.06.012}, issn = {00207225}, year = {2006}, date = {2006-01-01}, journal = {International Journal of Engineering Science}, abstract = {The stationary state probability densities appear not only in the study of dynamical systems with random vector fields, but also in the deterministic dynamical systems exhibiting chaotic behavior when the uncertainties in the initial conditions are represented with the probability densities. But since it is very hard problem to determine these densities, in this paper the new efficient method to obtain an approximate solution of Fokker-Planck-Kolmogorov equation which arises in the determination of the stationary state probability densities has been given by representing the densities with compactly supported functions. With specific choice of the compactly supported functions as piecewise multivariable polynomials which are supported on the ellipsoidal regions, the parameters to be calculated for determining the densities can be considerably decreased compared to Multi-Gaussian Closure scheme, in which the stationary densities are assumed to be the weighted average of the Gaussian densities. The main motivation to choose the compactly supported functions is that, in the chaotic dynamics the states are trapped in a specific compact subspace of the state space. The stationary state densities of two basic examples commonly considered in the literature have been estimated using the Parzen's estimator, and the densities obtained using the newly proposed method have been compared with these estimated densities and the densities obtained with the Multi-Gaussian Closure scheme. The results indicate that the presented compactly supported piecewise polynomial scheme can be successful compared to Multi-Gaussian scheme, when the system is highly nonlinear. textcopyright 2006 Elsevier Ltd. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } The stationary state probability densities appear not only in the study of dynamical systems with random vector fields, but also in the deterministic dynamical systems exhibiting chaotic behavior when the uncertainties in the initial conditions are represented with the probability densities. But since it is very hard problem to determine these densities, in this paper the new efficient method to obtain an approximate solution of Fokker-Planck-Kolmogorov equation which arises in the determination of the stationary state probability densities has been given by representing the densities with compactly supported functions. With specific choice of the compactly supported functions as piecewise multivariable polynomials which are supported on the ellipsoidal regions, the parameters to be calculated for determining the densities can be considerably decreased compared to Multi-Gaussian Closure scheme, in which the stationary densities are assumed to be the weighted average of the Gaussian densities. The main motivation to choose the compactly supported functions is that, in the chaotic dynamics the states are trapped in a specific compact subspace of the state space. The stationary state densities of two basic examples commonly considered in the literature have been estimated using the Parzen's estimator, and the densities obtained using the newly proposed method have been compared with these estimated densities and the densities obtained with the Multi-Gaussian Closure scheme. The results indicate that the presented compactly supported piecewise polynomial scheme can be successful compared to Multi-Gaussian scheme, when the system is highly nonlinear. textcopyright 2006 Elsevier Ltd. All rights reserved. |
Savacı, FA Artificial Intelligence and Neural Networks Miscellaneous 2006. @misc{pop00030eb, title = {Artificial Intelligence and Neural Networks}, author = {FA Savacı}, year = {2006}, date = {2006-01-01}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |
McIntyre, M; Dixon, W; Dawson, D; Tatlicioglu, E Passive coordination of nonlinear bilateral teleoperated manipulators Journal Article Robotica, 24 (4), pp. 463–476, 2006. @article{pop00033bb, title = {Passive coordination of nonlinear bilateral teleoperated manipulators}, author = {M McIntyre and W Dixon and D Dawson and E Tatlicioglu}, year = {2006}, date = {2006-01-01}, journal = {Robotica}, volume = {24}, number = {4}, pages = {463--476}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Krol, A; Unlu, MZ; Baum, KG; Mandel, JA; Lee, W; Coman, IL; Lipson, ED; ..., MRI/PET nonrigid breast-image registration using skin fiducial markers Journal Article Physica Medica, 21 , pp. 39–43, 2006. @article{pop00001gb, title = {MRI/PET nonrigid breast-image registration using skin fiducial markers}, author = {A Krol and MZ Unlu and KG Baum and JA Mandel and W Lee and IL Coman and ED Lipson and ...}, year = {2006}, date = {2006-01-01}, journal = {Physica Medica}, volume = {21}, pages = {39--43}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Krol, A; Unlu, MZ; Magri, A; Lipson, E; Coman, IL; Mandel, JA; Baum, KG; ..., Iterative finite element deformable model for nonrigid coregistration of multimodal breast images Journal Article 3rd IEEE International Symposium on Biomedical Imaging: Nano to Macro, 2006 …, 2006. @article{pop00003g, title = {Iterative finite element deformable model for nonrigid coregistration of multimodal breast images}, author = {A Krol and MZ Unlu and A Magri and E Lipson and IL Coman and JA Mandel and KG Baum and ...}, year = {2006}, date = {2006-01-01}, journal = {3rd IEEE International Symposium on Biomedical Imaging: Nano to Macro, 2006 …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Baum, KG; Helguera, M; Hornak, JP; Kerekes, JP; Montag, ED; Unlu, MZ; ..., Techniques for fusion of multimodal images: Application to breast imaging Journal Article 2006 International Conference on Image Processing, pp. 2521–2524, 2006. @article{pop00004eb, title = {Techniques for fusion of multimodal images: Application to breast imaging}, author = {KG Baum and M Helguera and JP Hornak and JP Kerekes and ED Montag and MZ Unlu and ...}, year = {2006}, date = {2006-01-01}, journal = {2006 International Conference on Image Processing}, pages = {2521--2524}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Krol, A; Magri, A; Unlu, M; Feiglin, D; Lipson, E; Mandel, J; Tillapaugh-Fay, G; ..., Motion correction via nonrigid coregistration of dynamic MR mammography series Journal Article Medical Imaging 2006: Image Processing, 6144 , pp. 614439–614439, 2006. @article{pop00012e, title = {Motion correction via nonrigid coregistration of dynamic MR mammography series}, author = {A Krol and A Magri and M Unlu and D Feiglin and E Lipson and J Mandel and G Tillapaugh-Fay and ...}, year = {2006}, date = {2006-01-01}, journal = {Medical Imaging 2006: Image Processing}, volume = {6144}, pages = {614439--614439}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Krol, A; Magri, A; Unlu, M; Feiglin, D; Lipson, E; Mandel, J; Tillapaugh-Fay, G; ..., Motion correction via nonrigid coregistration of dynamic MR mammography series Journal Article Medical Imaging, 614439-, pp. 614439–7, 2006. @article{pop00013g, title = {Motion correction via nonrigid coregistration of dynamic MR mammography series}, author = {A Krol and A Magri and M Unlu and D Feiglin and E Lipson and J Mandel and G Tillapaugh-Fay and ...}, year = {2006}, date = {2006-01-01}, journal = {Medical Imaging, 614439-}, pages = {614439--7}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Unlu, MZ Iterative deformable finite element model for nonrigid 3D PET/MRI breast image registration Miscellaneous 2006. @misc{pop00014g, title = {Iterative deformable finite element model for nonrigid 3D PET/MRI breast image registration}, author = {MZ Unlu}, year = {2006}, date = {2006-01-01}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |
Krol, A; Unlu, MZ; Magri, A; Feiglin, DH; Lipson, ED; Coman, IL; Mandel, JA; ..., Accurate PET/CT/MRI breast image fusion for improved breast cancer detection Journal Article EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 33, S190-S, 190 , 2006. @article{pop00018h, title = {Accurate PET/CT/MRI breast image fusion for improved breast cancer detection}, author = {A Krol and MZ Unlu and A Magri and DH Feiglin and ED Lipson and IL Coman and JA Mandel and ...}, year = {2006}, date = {2006-01-01}, journal = {EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 33, S190-S}, volume = {190}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
serkan gunel,; acar f savaci, determination of stationary state densities of nonlinear stochastic dynamical systems Journal Article international journal of engineering science, 2006. @article{pop00051cb, title = {determination of stationary state densities of nonlinear stochastic dynamical systems}, author = {serkan gunel and acar f savaci}, year = {2006}, date = {2006-01-01}, journal = {international journal of engineering science}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Magri, A; Krol, A; Unlu, MZ; Feiglin, DH; Lipson, ED; Mandel, JA; Lee, W; ..., Advanced dynamic F-18-FDG PET/CT breast cancer imaging Journal Article EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 33, S252-S, 252 , 2006. @article{pop00019j, title = {Advanced dynamic F-18-FDG PET/CT breast cancer imaging}, author = {A Magri and A Krol and MZ Unlu and DH Feiglin and ED Lipson and JA Mandel and W Lee and ...}, year = {2006}, date = {2006-01-01}, journal = {EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 33, S252-S}, volume = {252}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Unlu, MZ; Krol, A; Magri, A; Feiglin, DH; Mandel, JA; Lipson, ED; Coman, IL; ..., Iterative deformable FEM model for nonrigid PET/MRI breast image coregistration Journal Article Medical Imaging 2006: Image Processing, 6144 , pp. 614435–614435, 2006. @article{pop00020h, title = {Iterative deformable FEM model for nonrigid PET/MRI breast image coregistration}, author = {MZ Unlu and A Krol and A Magri and DH Feiglin and JA Mandel and ED Lipson and IL Coman and ...}, year = {2006}, date = {2006-01-01}, journal = {Medical Imaging 2006: Image Processing}, volume = {6144}, pages = {614435--614435}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Unlu, MZ; Krol, A; Magri, A; Feiglin, DH; Mandel, JA; Lipson, ED; Coman, IL; ..., Iterative deformable FEM model for nonrigid PET/MRI breast image coregistration Journal Article Medical Imaging 2006: Image Processing, 6144 , pp. 614435–614435, 2006. @article{pop00021g, title = {Iterative deformable FEM model for nonrigid PET/MRI breast image coregistration}, author = {MZ Unlu and A Krol and A Magri and DH Feiglin and JA Mandel and ED Lipson and IL Coman and ...}, year = {2006}, date = {2006-01-01}, journal = {Medical Imaging 2006: Image Processing}, volume = {6144}, pages = {614435--614435}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
UNLU, MZ; KROL, A; MAGRI, A; FEIGLIN, DH; MANDEL, JA; LIPSON, ED; ..., Iterative deformable FEM model for nonrigid PET Journal Article Progress in biomedical optics and imaging, 7 (30), 2006. @article{pop00022f, title = {Iterative deformable FEM model for nonrigid PET}, author = {MZ UNLU and A KROL and A MAGRI and DH FEIGLIN and JA MANDEL and ED LIPSON and ...}, year = {2006}, date = {2006-01-01}, journal = {Progress in biomedical optics and imaging}, volume = {7}, number = {30}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Atakan, Bariş; Akan, Özgür B Immune system based distributed node and rate selection in wireless sensor networks Inproceedings 2006 1st Bio-Inspired Models of Network, Information and Computing Systems, BIONETICS, 2006, ISBN: 1424404630. @inproceedings{Atakan2006, title = {Immune system based distributed node and rate selection in wireless sensor networks}, author = {Bariş Atakan and Özgür B Akan}, doi = {10.1109/BIMNICS.2006.361806}, isbn = {1424404630}, year = {2006}, date = {2006-01-01}, booktitle = {2006 1st Bio-Inspired Models of Network, Information and Computing Systems, BIONETICS}, abstract = {Wireless sensor networks (WSNs) are event-based systems that rely on the collective effort of dense deployed sensor nodes. Due to the dense deployment, since sensor observations are spatially correlated with respect to spatial location of sensor nodes, it may not be necessary for every sensor node to transmit its data. Therefore, due to the resource constraints of sensor nodes it is needed to select the minimum number of sensor nodes to transmit the data to the sink. Furthermore, to achieve the application-specific distortion bound at the sink it is also imperative to select the appropriate reporting frequency of sensor nodes to achieve the minimum energy consumption. In order to address these needs, we propose the new Distributed Node and Rate Selection (DNRS) method which is based on the principles of natural immune system. Based on the B-cell stimulation in immune system, DNRS selects the most appropriate sensor nodes that send samples of the observed event, are referred to as designated nodes. The aim of the designated node selection is to meet the event estimation distortion constraint at the sink node with the minimum number of sensor nodes. DNRS enables each sensor node to distributively decide whether it is a designated node or not. In addition, to exploit the temporal correlation in the event data DNRS regulates the reporting frequency rate of each sensor node while meeting the application-specific delay bound at the sink. Based on the immune network principles, DNRS distributively selects the appropriate reporting frequencies of sensor nodes according to the congestion in the forward path and the event estimation distortion periodically calculated at the sink by Adaptive LMS Filter. Performance evaluation shows that DNRS provides the minimum number of designated nodes to reliably detect the event properties and it regulates the reporting frequency of designated nodes to exploit the temporal correlation in the event data whereby it provides the significant energy saving.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } Wireless sensor networks (WSNs) are event-based systems that rely on the collective effort of dense deployed sensor nodes. Due to the dense deployment, since sensor observations are spatially correlated with respect to spatial location of sensor nodes, it may not be necessary for every sensor node to transmit its data. Therefore, due to the resource constraints of sensor nodes it is needed to select the minimum number of sensor nodes to transmit the data to the sink. Furthermore, to achieve the application-specific distortion bound at the sink it is also imperative to select the appropriate reporting frequency of sensor nodes to achieve the minimum energy consumption. In order to address these needs, we propose the new Distributed Node and Rate Selection (DNRS) method which is based on the principles of natural immune system. Based on the B-cell stimulation in immune system, DNRS selects the most appropriate sensor nodes that send samples of the observed event, are referred to as designated nodes. The aim of the designated node selection is to meet the event estimation distortion constraint at the sink node with the minimum number of sensor nodes. DNRS enables each sensor node to distributively decide whether it is a designated node or not. In addition, to exploit the temporal correlation in the event data DNRS regulates the reporting frequency rate of each sensor node while meeting the application-specific delay bound at the sink. Based on the immune network principles, DNRS distributively selects the appropriate reporting frequencies of sensor nodes according to the congestion in the forward path and the event estimation distortion periodically calculated at the sink by Adaptive LMS Filter. Performance evaluation shows that DNRS provides the minimum number of designated nodes to reliably detect the event properties and it regulates the reporting frequency of designated nodes to exploit the temporal correlation in the event data whereby it provides the significant energy saving. |
Özbek, Berna; Ruyet, Didier Le; Khiari, Hajer Adaptive resource allocation for multicast OFDM systems with multiple transmit antennas Inproceedings IEEE International Conference on Communications, 2006, ISSN: 05361486. @inproceedings{Ozbek2006, title = {Adaptive resource allocation for multicast OFDM systems with multiple transmit antennas}, author = {Berna Özbek and Didier Le Ruyet and Hajer Khiari}, doi = {10.1109/ICC.2006.255332}, issn = {05361486}, year = {2006}, date = {2006-01-01}, booktitle = {IEEE International Conference on Communications}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Yaman, F; Yapar, A One-Dimensional Profile Inversion of a Planar Layer Bounded by an Inhomogeneous Impedance Boundary Journal Article Proceedings of XIth International Seminar/Workshop on Direct and Inverse …, 2006. @article{pop00014cb, title = {One-Dimensional Profile Inversion of a Planar Layer Bounded by an Inhomogeneous Impedance Boundary}, author = {F Yaman and A Yapar}, year = {2006}, date = {2006-01-01}, journal = {Proceedings of XIth International Seminar/Workshop on Direct and Inverse …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ozbek, B; Ruyet, Le D Low complexity ZF receiver for orthogonal SFBC-OFDM in broadband wireless channels Journal Article Electronics Letters, 42 (8), pp. 479–481, 2006. @article{pop00022d, title = {Low complexity ZF receiver for orthogonal SFBC-OFDM in broadband wireless channels}, author = {B Ozbek and Le D Ruyet}, year = {2006}, date = {2006-01-01}, journal = {Electronics Letters}, volume = {42}, number = {8}, pages = {479--481}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Guldiken, Rasim; Zahorian, Jaime; Balantekin, Mujdat; Degertekin, Levent F; Tekeş, Coşkun; Sişman, Alper; Karaman, Mustafa Dual-annular-ring CMUT array for forward-looking IVUS imaging Inproceedings Proceedings - IEEE Ultrasonics Symposium, 2006, ISSN: 10510117. @inproceedings{Guldiken2006, title = {Dual-annular-ring CMUT array for forward-looking IVUS imaging}, author = {Rasim Guldiken and Jaime Zahorian and Mujdat Balantekin and Levent F Degertekin and Coşkun Tekeş and Alper Sişman and Mustafa Karaman}, doi = {10.1109/ULTSYM.2006.187}, issn = {10510117}, year = {2006}, date = {2006-01-01}, booktitle = {Proceedings - IEEE Ultrasonics Symposium}, abstract = {We investigate a dual-annular-ring CMUT array configuration for forward-looking intravascular ultrasound (FL-IVUS) imaging. The array consists of separate, concentric transmit and receive ring arrays built on the same silicon substrate. This configuration has the potential for independent optimization of each array and uses the silicon area more effectively without any particular drawback. We designed and fabricated a 1 mm diameter test array which consists of 24 transmit and 32 receive elements. We investigated synthetic phased array beamforming with a non-redundant subset of transmit-receive element pairs of the dual-annular-ring array. For imaging experiments, we designed and constructed a programmable FPGA-based data acquisition and phased array beamforming system. Pulse-echo measurements along with imaging simulations suggest that dual-ring-annular array should provide performance suitable for real-time FL-IVUS applications}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } We investigate a dual-annular-ring CMUT array configuration for forward-looking intravascular ultrasound (FL-IVUS) imaging. The array consists of separate, concentric transmit and receive ring arrays built on the same silicon substrate. This configuration has the potential for independent optimization of each array and uses the silicon area more effectively without any particular drawback. We designed and fabricated a 1 mm diameter test array which consists of 24 transmit and 32 receive elements. We investigated synthetic phased array beamforming with a non-redundant subset of transmit-receive element pairs of the dual-annular-ring array. For imaging experiments, we designed and constructed a programmable FPGA-based data acquisition and phased array beamforming system. Pulse-echo measurements along with imaging simulations suggest that dual-ring-annular array should provide performance suitable for real-time FL-IVUS applications |
Karacali, Bilge; Davatzikos, Christos Simulation of tissue atrophy using a topology preserving transformation model Journal Article IEEE Transactions on Medical Imaging, 2006, ISSN: 02780062. @article{Karacali2006, title = {Simulation of tissue atrophy using a topology preserving transformation model}, author = {Bilge Karacali and Christos Davatzikos}, doi = {10.1109/TMI.2006.873221}, issn = {02780062}, year = {2006}, date = {2006-01-01}, journal = {IEEE Transactions on Medical Imaging}, abstract = {We propose a method to simulate atrophy and other similar volumetric change effects on medical images. Given a desired level of atrophy, we find a dense warping deformation that produces the corresponding levels of volumetric loss on the labeled tissue using an energy minimization strategy. Simulated results on a real brain image indicate that the method generates realistic images of tissue loss. The method does not make assumptions regarding the mechanics of tissue deformation, and provides a framework where a pre-specified pattern of atrophy can readily be simulated. Furthermore, it provides exact correspondences between images prior and posterior to the atrophy that can be used to evaluate provisional image registration and atrophy quantification algorithms.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We propose a method to simulate atrophy and other similar volumetric change effects on medical images. Given a desired level of atrophy, we find a dense warping deformation that produces the corresponding levels of volumetric loss on the labeled tissue using an energy minimization strategy. Simulated results on a real brain image indicate that the method generates realistic images of tissue loss. The method does not make assumptions regarding the mechanics of tissue deformation, and provides a framework where a pre-specified pattern of atrophy can readily be simulated. Furthermore, it provides exact correspondences between images prior and posterior to the atrophy that can be used to evaluate provisional image registration and atrophy quantification algorithms. |
Xue, Zhong; Shen, Dinggang; Karacali, Bilge; Stern, Joshua; Rottenberg, David; Davatzikos, Christos Simulating deformations of MR brain images for validation of atlas-based segmentation and registration algorithms Journal Article NeuroImage, 2006, ISSN: 10538119. @article{Xue2006, title = {Simulating deformations of MR brain images for validation of atlas-based segmentation and registration algorithms}, author = {Zhong Xue and Dinggang Shen and Bilge Karacali and Joshua Stern and David Rottenberg and Christos Davatzikos}, doi = {10.1016/j.neuroimage.2006.08.007}, issn = {10538119}, year = {2006}, date = {2006-01-01}, journal = {NeuroImage}, abstract = {Simulated deformations and images can act as the gold standard for evaluating various template-based image segmentation and registration algorithms. Traditional deformable simulation methods, such as the use of analytic deformation fields or the displacement of landmarks followed by some form of interpolation, are often unable to construct rich (complex) and/or realistic deformations of anatomical organs. This paper presents new methods aiming to automatically simulate realistic inter- and intra-individual deformations. The paper first describes a statistical approach to capturing inter-individual variability of high-deformation fields from a number of examples (training samples). In this approach, Wavelet-Packet Transform (WPT) of the training deformations and their Jacobians, in conjunction with a Markov random field (MRF) spatial regularization, are used to capture both coarse and fine characteristics of the training deformations in a statistical fashion. Simulated deformations can then be constructed by randomly sampling the resultant statistical distribution in an unconstrained or a landmark-constrained fashion. The paper also describes a model for generating tissue atrophy or growth in order to simulate intra-individual brain deformations. Several sets of simulated deformation fields and respective images are generated, which can be used in the future for systematic and extensive validation studies of automated atlas-based segmentation and deformable registration methods. The code and simulated data are available through our Web site. textcopyright 2006 Elsevier Inc. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Simulated deformations and images can act as the gold standard for evaluating various template-based image segmentation and registration algorithms. Traditional deformable simulation methods, such as the use of analytic deformation fields or the displacement of landmarks followed by some form of interpolation, are often unable to construct rich (complex) and/or realistic deformations of anatomical organs. This paper presents new methods aiming to automatically simulate realistic inter- and intra-individual deformations. The paper first describes a statistical approach to capturing inter-individual variability of high-deformation fields from a number of examples (training samples). In this approach, Wavelet-Packet Transform (WPT) of the training deformations and their Jacobians, in conjunction with a Markov random field (MRF) spatial regularization, are used to capture both coarse and fine characteristics of the training deformations in a statistical fashion. Simulated deformations can then be constructed by randomly sampling the resultant statistical distribution in an unconstrained or a landmark-constrained fashion. The paper also describes a model for generating tissue atrophy or growth in order to simulate intra-individual brain deformations. Several sets of simulated deformation fields and respective images are generated, which can be used in the future for systematic and extensive validation studies of automated atlas-based segmentation and deformable registration methods. The code and simulated data are available through our Web site. textcopyright 2006 Elsevier Inc. All rights reserved. |
Altinkaya, Mustafa A; Anarim, Emin; Sankur, B??lent Phase noise mitigation in the autocorrelation estimates with data windowing: The case of two close sinusoids Inproceedings European Signal Processing Conference, 2006, ISSN: 22195491. @inproceedings{Altinkaya2006, title = {Phase noise mitigation in the autocorrelation estimates with data windowing: The case of two close sinusoids}, author = {Mustafa A Altinkaya and Emin Anarim and B??lent Sankur}, issn = {22195491}, year = {2006}, date = {2006-01-01}, booktitle = {European Signal Processing Conference}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Makrogiannis, Sokratis; Verma, Ragini; Karacali, Bilge; Davatzikos, Christos A joint transformation and residual image descriptor for morphometric image analysis using an equivalence class formulation Inproceedings Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition, 2006, ISSN: 10636919. @inproceedings{Makrogiannis2006, title = {A joint transformation and residual image descriptor for morphometric image analysis using an equivalence class formulation}, author = {Sokratis Makrogiannis and Ragini Verma and Bilge Karacali and Christos Davatzikos}, doi = {10.1109/CVPRW.2006.17}, issn = {10636919}, year = {2006}, date = {2006-01-01}, booktitle = {Proceedings of the IEEE Computer Society Conference on Computer Vision and Pattern Recognition}, abstract = {Existing computational anatomy methodologies for morphometric analysis of medical images are often based solely on the shape transformation, typically being a diffeomorphism, that warps these images to a common template or vice versa. However, anatomical differences as well as changes induced by pathology, prevent the warping transformation from producing an exact correspondence. The residual image captures information that is not reflected by the diffeomorphism, and therefore allows us to maintain the entire morphological profile for analysis. In this paper we present a morphological descriptor which combines the warping transformation with the residual image in an equivalence class formulation, to characterize morphology of anatomical structures. Equivalence classes are formed by pairs of transformation and residual, for different levels of smoothness of the warping transformation. These pairs belong to the same equivalence class, since they jointly reconstruct the exact same morphology. Moreover, pattern classification methods are trained on the entire equivalence class, instead of a single pair, in order to become more robust to a variety of factors that affect the warping transformation, including the anatomy being measured. This joint descriptor is evaluated by statistical testing and estimation of class separation by classification, initially for 2-D synthetic images with simulated atrophy and subsequently for a volumetric dataset consisting of schizophrenia patients and healthy controls. Results of class separation indicate that this joint descriptor produces generally better and more robust class separation than using each of the components separately.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } Existing computational anatomy methodologies for morphometric analysis of medical images are often based solely on the shape transformation, typically being a diffeomorphism, that warps these images to a common template or vice versa. However, anatomical differences as well as changes induced by pathology, prevent the warping transformation from producing an exact correspondence. The residual image captures information that is not reflected by the diffeomorphism, and therefore allows us to maintain the entire morphological profile for analysis. In this paper we present a morphological descriptor which combines the warping transformation with the residual image in an equivalence class formulation, to characterize morphology of anatomical structures. Equivalence classes are formed by pairs of transformation and residual, for different levels of smoothness of the warping transformation. These pairs belong to the same equivalence class, since they jointly reconstruct the exact same morphology. Moreover, pattern classification methods are trained on the entire equivalence class, instead of a single pair, in order to become more robust to a variety of factors that affect the warping transformation, including the anatomy being measured. This joint descriptor is evaluated by statistical testing and estimation of class separation by classification, initially for 2-D synthetic images with simulated atrophy and subsequently for a volumetric dataset consisting of schizophrenia patients and healthy controls. Results of class separation indicate that this joint descriptor produces generally better and more robust class separation than using each of the components separately. |
Mocan, Bora; Dinleyici, Mehmet Salih A novel all-optical routing architecture for optical packet switched networks Journal Article Photonic Network Communications, 2006, ISSN: 1387974X. @article{Mocan2006, title = {A novel all-optical routing architecture for optical packet switched networks}, author = {Bora Mocan and Mehmet Salih Dinleyici}, doi = {10.1007/s11107-006-5325-z}, issn = {1387974X}, year = {2006}, date = {2006-01-01}, journal = {Photonic Network Communications}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Savaci, FA; Günel, S Harmonic balance analysis of the generalized chua's circuit Journal Article International Journal of Bifurcation and Chaos, 16 (8), pp. 2325–2332, 2006. @article{pop00005m, title = {Harmonic balance analysis of the generalized chua's circuit}, author = {FA Savaci and S Günel}, year = {2006}, date = {2006-01-01}, journal = {International Journal of Bifurcation and Chaos}, volume = {16}, number = {8}, pages = {2325--2332}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Özkurt, N; Savaci, FA Reconstruction of nonstationary signals along the wavelet ridges Journal Article International Journal of Bifurcation and Chaos, 16 (1), pp. 191–198, 2006. @article{pop00008bb, title = {Reconstruction of nonstationary signals along the wavelet ridges}, author = {N Özkurt and FA Savaci}, year = {2006}, date = {2006-01-01}, journal = {International Journal of Bifurcation and Chaos}, volume = {16}, number = {1}, pages = {191--198}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Özkurt, Nalan; Savaci, Acar F The implementation of nonlinear dynamical systems with wavelet network Journal Article AEU - International Journal of Electronics and Communications, 2006, ISSN: 16180399. @article{Ozkurt2006, title = {The implementation of nonlinear dynamical systems with wavelet network}, author = {Nalan Özkurt and Acar F Savaci}, doi = {10.1016/j.aeue.2005.05.006}, issn = {16180399}, year = {2006}, date = {2006-01-01}, journal = {AEU - International Journal of Electronics and Communications}, abstract = {A dynamic wavelet network circuit implementation for modelling the nonlinear dynamical networks has been proposed in this study. The dynamical wavelet network includes static wavelet network with Mexican hat wavelet function, the voltage-controlled switches and capacitors. The circuit simulations have been done in Spice for the period-1 limit cycle, the spiral and double scroll attractors of the Chua's circuit. textcopyright 2005 Elsevier GmbH. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A dynamic wavelet network circuit implementation for modelling the nonlinear dynamical networks has been proposed in this study. The dynamical wavelet network includes static wavelet network with Mexican hat wavelet function, the voltage-controlled switches and capacitors. The circuit simulations have been done in Spice for the period-1 limit cycle, the spiral and double scroll attractors of the Chua's circuit. textcopyright 2005 Elsevier GmbH. All rights reserved. |
Kahraman, M; Gumustekin, S Detecting coastlines from aerial images Journal Article 2006 IEEE 14th Signal Processing and Communications Applications, 2006. @article{pop00008fb, title = {Detecting coastlines from aerial images}, author = {M Kahraman and S Gumustekin}, year = {2006}, date = {2006-01-01}, journal = {2006 IEEE 14th Signal Processing and Communications Applications}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Tatlicioglu, E; McIntyre, M; Dawson, D; Burg, T Coordination control for haptic and teleoperator systems Journal Article Proceedings of the 45th IEEE Conference on Decision and Control, pp. 2937–2942, 2006. @article{pop00019d, title = {Coordination control for haptic and teleoperator systems}, author = {E Tatlicioglu and M McIntyre and D Dawson and T Burg}, year = {2006}, date = {2006-01-01}, journal = {Proceedings of the 45th IEEE Conference on Decision and Control}, pages = {2937--2942}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ozan, Şükrü; Gümüştekin, Şevket A case study on logging visual activities: Chess game Inproceedings Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 2006, ISSN: 16113349. @inproceedings{Ozan2006, title = {A case study on logging visual activities: Chess game}, author = {Şükrü Ozan and Şevket Gümüştekin}, doi = {10.1007/11803089_1}, issn = {16113349}, year = {2006}, date = {2006-01-01}, booktitle = {Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)}, abstract = {Automatically recognizing and analyzing visual activities in complex environments is a challenging and open-ended problem. In this study this task is performed in a chess game scenario where the rules, actions and the environment are well defined. The purpose here is to detect and observe a FIDE (Federation International des Echecs) compatible chess board, generating a log file of the moves made by human players. A series of basic image processing operations have been applied to perform the desired task. The first step of automatically detecting a chess board is followed by locating the positions of the pieces. After the initial setup is established every move made by a player is automatically detected and verified. Intel (R) Open Source Computer Vision Library (OpenCV) is used in the current software implementation.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } Automatically recognizing and analyzing visual activities in complex environments is a challenging and open-ended problem. In this study this task is performed in a chess game scenario where the rules, actions and the environment are well defined. The purpose here is to detect and observe a FIDE (Federation International des Echecs) compatible chess board, generating a log file of the moves made by human players. A series of basic image processing operations have been applied to perform the desired task. The first step of automatically detecting a chess board is followed by locating the positions of the pieces. After the initial setup is established every move made by a player is automatically detected and verified. Intel (R) Open Source Computer Vision Library (OpenCV) is used in the current software implementation. |
2005 |
Ozbek, Berna; Ruyet, Le D Pilot-symbol-aided iterative channel estimation for OFDM-based systems Journal Article Electronics and Communications, 2005, ISBN: 1604238216. @article{Ozbek2005, title = {Pilot-symbol-aided iterative channel estimation for OFDM-based systems}, author = {Berna Ozbek and Le D Ruyet}, isbn = {1604238216}, year = {2005}, date = {2005-01-01}, journal = {Electronics and Communications}, abstract = {In this paper, we propose a pilot-symbol-aided iterative chan- nel estimation for coded OFDM-based systems. We use the symbol APP provided by the channel decoder to form groups of virtual pilots. According to their reliabilities, we com- bine these groups to improve the channel estimation. We also compare}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this paper, we propose a pilot-symbol-aided iterative chan- nel estimation for coded OFDM-based systems. We use the symbol APP provided by the channel decoder to form groups of virtual pilots. According to their reliabilities, we com- bine these groups to improve the channel estimation. We also compare |
Özbek, Berna; Yilmaz, Reyat The adaptive channel estimation for STBC-OFDM systems Journal Article Istanbul University - Journal of Electrical and Electronics Engineering, 2005, ISSN: 13030914. @article{Ozbek2005a, title = {The adaptive channel estimation for STBC-OFDM systems}, author = {Berna Özbek and Reyat Yilmaz}, issn = {13030914}, year = {2005}, date = {2005-01-01}, journal = {Istanbul University - Journal of Electrical and Electronics Engineering}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ruyet, Le D; Ozbek, B Systèmes MIMO et codage spatio-temporel Journal Article Revue de l’électricité et de l’électronique,, (4), 2005. @article{pop00015cb, title = {Systèmes MIMO et codage spatio-temporel}, author = {Le D Ruyet and B Ozbek}, year = {2005}, date = {2005-01-01}, journal = {Revue de l’électricité et de l’électronique,}, number = {4}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yuksel, K; Dupont, S; Hamoir, D; Froidure, JC FTTx automated test solution: requirements and experimental implementation Journal Article Electronics Letters, 41 (9), pp. 546–547, 2005. @article{pop00008c, title = {FTTx automated test solution: requirements and experimental implementation}, author = {K Yuksel and S Dupont and D Hamoir and JC Froidure}, year = {2005}, date = {2005-01-01}, journal = {Electronics Letters}, volume = {41}, number = {9}, pages = {546--547}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ozbek, B; Ruyet, Le D Performance and complexity analysis of suboptimal MIMO detectors Journal Article Vehicular technology conference, 2005. VTC 2005-Spring. 2005 IEEE 61st 2 …, 2005. @article{pop00049bb, title = {Performance and complexity analysis of suboptimal MIMO detectors}, author = {B Ozbek and Le D Ruyet}, year = {2005}, date = {2005-01-01}, journal = {Vehicular technology conference, 2005. VTC 2005-Spring. 2005 IEEE 61st 2 …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Dupont, Samuel S; Foucart, F; Hamoir, D; Robette, L; Yuksel, K Device and method for real-time optical network monitoring Journal Article EP Patent EP1578039 A, 1 , 2005. @article{pop00054c, title = {Device and method for real-time optical network monitoring}, author = {Samuel S Dupont and F Foucart and D Hamoir and L Robette and K Yuksel}, year = {2005}, date = {2005-01-01}, journal = {EP Patent EP1578039 A}, volume = {1}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Guldiken, Rasim O; Balantekin, Mujdat; Degertekin, Levent F Analysis and design of dual-electrode CMUTs Inproceedings Proceedings - IEEE Ultrasonics Symposium, 2005, ISSN: 10510117. @inproceedings{Guldiken2005, title = {Analysis and design of dual-electrode CMUTs}, author = {Rasim O Guldiken and Mujdat Balantekin and Levent F Degertekin}, doi = {10.1109/ULTSYM.2005.1602919}, issn = {10510117}, year = {2005}, date = {2005-01-01}, booktitle = {Proceedings - IEEE Ultrasonics Symposium}, abstract = {Dual-electrode CMUTs are analyzed using analytical and finite element methods. The analysis results that show improved transmit and receive performance are verified by experiments. We conducted experiments to investigate the effect of side electrode biasing on both the magnitude and the frequency spectrum of the received signals. To show the potential of dual-electrode CMUT for imaging applications, pulse-echo experiments are done by applying dynamic biasing to the side electrodes. The dual electrode configuration eliminates the need for transmit-receive switching or protection circuitry, while significantly improving the CMUT performance. We also present a dual-electrode CMUT membrane design with slots between side and center electrodes which may increase the overall device performance by 10.7 dB. 2005 IEEE.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } Dual-electrode CMUTs are analyzed using analytical and finite element methods. The analysis results that show improved transmit and receive performance are verified by experiments. We conducted experiments to investigate the effect of side electrode biasing on both the magnitude and the frequency spectrum of the received signals. To show the potential of dual-electrode CMUT for imaging applications, pulse-echo experiments are done by applying dynamic biasing to the side electrodes. The dual electrode configuration eliminates the need for transmit-receive switching or protection circuitry, while significantly improving the CMUT performance. We also present a dual-electrode CMUT membrane design with slots between side and center electrodes which may increase the overall device performance by 10.7 dB. 2005 IEEE. |
Altınkaya, MA; Anarım, E; Sankur, B Removal of the phase noise in the autocorrelation estimates with data windowing Journal Article 2005 13th European Signal Processing Conference, pp. 1–4, 2005. @article{pop00018f, title = {Removal of the phase noise in the autocorrelation estimates with data windowing}, author = {MA Altınkaya and E Anarım and B Sankur}, year = {2005}, date = {2005-01-01}, journal = {2005 13th European Signal Processing Conference}, pages = {1--4}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Xue, Zhong; Shen, Dinggang; Karacali, Bilge; Davatzikos, Christos Statistical representation and simulation of high-dimensional deformations: Application to synthesizing brain deformations Inproceedings Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 2005, ISSN: 03029743. @inproceedings{Xue2005, title = {Statistical representation and simulation of high-dimensional deformations: Application to synthesizing brain deformations}, author = {Zhong Xue and Dinggang Shen and Bilge Karacali and Christos Davatzikos}, doi = {10.1007/11566489_62}, issn = {03029743}, year = {2005}, date = {2005-01-01}, booktitle = {Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)}, abstract = {This paper proposes an approach to effectively representing the statistics of high-dimensional deformations, when relatively few training samples are available, and conventional methods, like PCA, fail due to insufficient training. Based on previous work on scale-space decomposition of deformation fields, herein we represent the space of "valid deformations" as the intersection of three subspaces: one that satisfies constraints on deformations themselves, one that satisfies constraints on Jacobian determinants of deformations, and one that represents smooth deformations via a Markov Random Field (MRF). The first two are extensions of PCA-based statistical shape models. They are based on a wavelet packet basis decomposition that allows for more accurate estimation of the covariance structure of deformation or Jacobian fields, and they are used jointly due to their complementary strengths and limitations. The third is a nested MRF regularization aiming at eliminating potential discontinuities introduced by assumptions in the statistical models. A randomly sampled deformation field is projected onto the space of valid deformations via iterative projections on each of these subspaces until convergence, i.e. all three constraints are met. A deformation field simulator uses this process to generate random samples of deformation fields that are not only realistic but also representative of the full range of anatomical variability. These simulated deformations can be used for validation of deformable registration methods. Other potential uses of this approach include representation of shape priors in statistical shape models as well as various estimation and hypothesis testing paradigms in the general fields of computational anatomy and pattern recognition.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } This paper proposes an approach to effectively representing the statistics of high-dimensional deformations, when relatively few training samples are available, and conventional methods, like PCA, fail due to insufficient training. Based on previous work on scale-space decomposition of deformation fields, herein we represent the space of "valid deformations" as the intersection of three subspaces: one that satisfies constraints on deformations themselves, one that satisfies constraints on Jacobian determinants of deformations, and one that represents smooth deformations via a Markov Random Field (MRF). The first two are extensions of PCA-based statistical shape models. They are based on a wavelet packet basis decomposition that allows for more accurate estimation of the covariance structure of deformation or Jacobian fields, and they are used jointly due to their complementary strengths and limitations. The third is a nested MRF regularization aiming at eliminating potential discontinuities introduced by assumptions in the statistical models. A randomly sampled deformation field is projected onto the space of valid deformations via iterative projections on each of these subspaces until convergence, i.e. all three constraints are met. A deformation field simulator uses this process to generate random samples of deformation fields that are not only realistic but also representative of the full range of anatomical variability. These simulated deformations can be used for validation of deformable registration methods. Other potential uses of this approach include representation of shape priors in statistical shape models as well as various estimation and hypothesis testing paradigms in the general fields of computational anatomy and pattern recognition. |
Akın, O All optical switching via diffraction grating formed by interference of Gaussian beams Journal Article Izmir Institute of Technology, 2005. @article{pop00006f, title = {All optical switching via diffraction grating formed by interference of Gaussian beams}, author = {O Akın}, year = {2005}, date = {2005-01-01}, journal = {Izmir Institute of Technology}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ozkurt, N; Savaci, FA Determination of wavelet ridges of nonstationary signals by singular value decomposition Journal Article IEEE Transactions on Circuits and Systems II: Express Briefs, 52 (8), pp. 480–485, 2005. @article{pop00003p, title = {Determination of wavelet ridges of nonstationary signals by singular value decomposition}, author = {N Ozkurt and FA Savaci}, year = {2005}, date = {2005-01-01}, journal = {IEEE Transactions on Circuits and Systems II: Express Briefs}, volume = {52}, number = {8}, pages = {480--485}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Gunel, S; Savaci, FA Approximate stationary density of the nonlinear dynamical systems excited with white noise Journal Article 2005 IEEE International Symposium on Circuits and Systems, pp. 4899–4902, 2005. @article{pop00013fb, title = {Approximate stationary density of the nonlinear dynamical systems excited with white noise}, author = {S Gunel and FA Savaci}, year = {2005}, date = {2005-01-01}, journal = {2005 IEEE International Symposium on Circuits and Systems}, pages = {4899--4902}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Tatlicioglu, E; McIntyre, M; Dawson, D; Walker, I Adaptive nonlinear tracking control of kinematically redundant robot manipulators with sub-task extensions Journal Article Proceedings of the 44th IEEE Conference on Decision and Control, pp. 4373–4378, 2005. @article{pop00013b, title = {Adaptive nonlinear tracking control of kinematically redundant robot manipulators with sub-task extensions}, author = {E Tatlicioglu and M McIntyre and D Dawson and I Walker}, year = {2005}, date = {2005-01-01}, journal = {Proceedings of the 44th IEEE Conference on Decision and Control}, pages = {4373--4378}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Özkurt, Nalan; Savaci, Acar F; Gündüzalp, Mustafa The circuit realization of Mexican Hat wavelet function Journal Article AEU - International Journal of Electronics and Communications, 2005, ISSN: 16180399. @article{Ozkurt2005a, title = {The circuit realization of Mexican Hat wavelet function}, author = {Nalan Özkurt and Acar F Savaci and Mustafa Gündüzalp}, doi = {10.1016/j.aeue.2004.11.023}, issn = {16180399}, year = {2005}, date = {2005-01-01}, journal = {AEU - International Journal of Electronics and Communications}, abstract = {A wavelet network circuit implementation for Mexican Hat mother wavelet has been proposed for nonlinear function approximation which can also be used for the realization of the algebraic nonlinear components. The Mexican Hat mother wavelet function has been implemented with discrete circuit components and it has been observed that the experimental waveform obtained from the realized circuit is approximately same as the Spice simulation of the original function. The circuit simulations of exemplar functions implemented in Spice are also given. textcopyright 2004 Elsevier GmbH. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A wavelet network circuit implementation for Mexican Hat mother wavelet has been proposed for nonlinear function approximation which can also be used for the realization of the algebraic nonlinear components. The Mexican Hat mother wavelet function has been implemented with discrete circuit components and it has been observed that the experimental waveform obtained from the realized circuit is approximately same as the Spice simulation of the original function. The circuit simulations of exemplar functions implemented in Spice are also given. textcopyright 2004 Elsevier GmbH. All rights reserved. |
Kahraman, M Automatic matching of aerial coastline images with map data Journal Article Izmir Institute of Technology, 2005. @article{pop00015g, title = {Automatic matching of aerial coastline images with map data}, author = {M Kahraman}, year = {2005}, date = {2005-01-01}, journal = {Izmir Institute of Technology}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Gunel, S; Savaci, F Existence of the state probability densities of the Chua’s circuit Journal Article Nonlinear Dynamics of Electronic Systems (NDES)(Postdam, Germany, 2005), pp. 1–6, 2005. @article{pop00040db, title = {Existence of the state probability densities of the Chua’s circuit}, author = {S Gunel and F Savaci}, year = {2005}, date = {2005-01-01}, journal = {Nonlinear Dynamics of Electronic Systems (NDES)(Postdam, Germany, 2005)}, pages = {1--6}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Unlu, MZ; Krol, A; Coman, IL; Mandel, JA; Baum, KG; Lee, W; Lipson, ED; ..., Deformable model for 3D intramodal nonrigid breast image registration with fiducial skin markers Journal Article Medical Imaging, pp. 1528–1534, 2005. @article{pop00008g, title = {Deformable model for 3D intramodal nonrigid breast image registration with fiducial skin markers}, author = {MZ Unlu and A Krol and IL Coman and JA Mandel and KG Baum and W Lee and ED Lipson and ...}, year = {2005}, date = {2005-01-01}, journal = {Medical Imaging}, pages = {1528--1534}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Krol, A; Feiglin, DH; Unlu, MZ; Mandel, JA; Magri, A; Lee, W; Coman, IL; ..., New Approach to F-18-FDG PET Dynamic Data Acquisition and Analysis for Breast Cancer Imaging Journal Article EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 32, S150-S, 150 , 2005. @article{pop00023g, title = {New Approach to F-18-FDG PET Dynamic Data Acquisition and Analysis for Breast Cancer Imaging}, author = {A Krol and DH Feiglin and MZ Unlu and JA Mandel and A Magri and W Lee and IL Coman and ...}, year = {2005}, date = {2005-01-01}, journal = {EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 32, S150-S}, volume = {150}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Unlu, MZ; Krol, A; Feiglin, DH; Mandel, JA; Lee, W; Coman, IL; Lipson, ED Fusion of F-18-FDG PET and MR Mammography via Nonrigid Breast-Image Registration Journal Article EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 32, S77-S, 77 , 2005. @article{pop00024g, title = {Fusion of F-18-FDG PET and MR Mammography via Nonrigid Breast-Image Registration}, author = {MZ Unlu and A Krol and DH Feiglin and JA Mandel and W Lee and IL Coman and ED Lipson}, year = {2005}, date = {2005-01-01}, journal = {EUROPEAN JOURNAL OF NUCLEAR MEDICINE AND MOLECULAR IMAGING 32, S77-S}, volume = {77}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Atakan, B; Erkmen, AM; Erkmen, I 3-D grasping during serpentine motion with a snake-like robot Journal Article MIDDLE EAST TECHNICAL UNIVERSITY, 2005. @article{pop00019c, title = {3-D grasping during serpentine motion with a snake-like robot}, author = {B Atakan and AM Erkmen and I Erkmen}, year = {2005}, date = {2005-01-01}, journal = {MIDDLE EAST TECHNICAL UNIVERSITY}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
2004 |
Ruyet, Le D; Bertozzi, T; Ozbek, B Breadth first algorithms for APP detectors over MIMO channels Journal Article Communications, 2004 IEEE International Conference on, 2 , pp. 926–930, 2004. @article{pop00001bb, title = {Breadth first algorithms for APP detectors over MIMO channels}, author = {Le D Ruyet and T Bertozzi and B Ozbek}, year = {2004}, date = {2004-01-01}, journal = {Communications, 2004 IEEE International Conference on}, volume = {2}, pages = {926--930}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Apaydın, MS; Brutlag, DL; Guestrin, C; Hsu, D; Latombe, JC Stochastic conformational roadmaps for computing ensemble properties of molecular motion Journal Article Algorithmic Foundations of Robotics V, pp. 131–147, 2004. @article{pop00018i, title = {Stochastic conformational roadmaps for computing ensemble properties of molecular motion}, author = {MS Apaydın and DL Brutlag and C Guestrin and D Hsu and JC Latombe}, year = {2004}, date = {2004-01-01}, journal = {Algorithmic Foundations of Robotics V}, pages = {131--147}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yuksel, K; Dupont, S; Robette, L; Hamoir, D; Froidure, JC OTDR-based fault surveillance method for tree-structured passive optical networks Journal Article Int. Symp, 2004. @article{pop00013d, title = {OTDR-based fault surveillance method for tree-structured passive optical networks}, author = {K Yuksel and S Dupont and L Robette and D Hamoir and JC Froidure}, year = {2004}, date = {2004-01-01}, journal = {Int. Symp}, publisher = {on Services and Local Access, ISSLS}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ozbek, B; Ruyet, Le D Performance analysis of coded SFBC-OFDM systems with four transmit antennas Journal Article 9th International OFDM-Workshop, Sept., 2004 , 2004. @article{pop00072, title = {Performance analysis of coded SFBC-OFDM systems with four transmit antennas}, author = {B Ozbek and Le D Ruyet}, year = {2004}, date = {2004-01-01}, journal = {9th International OFDM-Workshop, Sept.}, volume = {2004}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Karacali, Bilge; Davatzikos, Christos Estimating topology preserving and smooth displacement fields Journal Article IEEE Transactions on Medical Imaging, 2004, ISSN: 02780062. @article{Karacali2004, title = {Estimating topology preserving and smooth displacement fields}, author = {Bilge Karacali and Christos Davatzikos}, doi = {10.1109/TMI.2004.827963}, issn = {02780062}, year = {2004}, date = {2004-01-01}, journal = {IEEE Transactions on Medical Imaging}, abstract = {We propose a method for enforcing topology preservation and smoothness onto a given displacement field. We first analyze the conditions for topology preservation on two- and three-dimensional displacement fields over a discrete rectangular grid. We then pose the problem of finding the closest topology preserving displacement field in terms of its complete set of gradients, which we later solve using a cyclic projections framework. Adaptive smoothing of a displacement field is then formulated as an extension of topology preservation, via constraints imposed on the Jacobian of the displacement field. The simulation results indicate that this technique is a fast and reliable method to estimate a topology preserving displacement field from a noisy observation that does not necessarily preserve topology. They also show that the proposed smoothing method can render morphometric analysis methods that are based on displacement field of shape transformations more robust to noise without removing important morphologic characteristics.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We propose a method for enforcing topology preservation and smoothness onto a given displacement field. We first analyze the conditions for topology preservation on two- and three-dimensional displacement fields over a discrete rectangular grid. We then pose the problem of finding the closest topology preserving displacement field in terms of its complete set of gradients, which we later solve using a cyclic projections framework. Adaptive smoothing of a displacement field is then formulated as an extension of topology preservation, via constraints imposed on the Jacobian of the displacement field. The simulation results indicate that this technique is a fast and reliable method to estimate a topology preserving displacement field from a noisy observation that does not necessarily preserve topology. They also show that the proposed smoothing method can render morphometric analysis methods that are based on displacement field of shape transformations more robust to noise without removing important morphologic characteristics. |
Lao, Zhiqiang; Shen, Dinggang; Xue, Zhong; Karacali, Bilge; Resnick, Susan M; Davatzikos, Christos Morphological classification of brains via high-dimensional shape transformations and machine learning methods Journal Article NeuroImage, 2004, ISSN: 10538119. @article{Lao2004, title = {Morphological classification of brains via high-dimensional shape transformations and machine learning methods}, author = {Zhiqiang Lao and Dinggang Shen and Zhong Xue and Bilge Karacali and Susan M Resnick and Christos Davatzikos}, doi = {10.1016/j.neuroimage.2003.09.027}, issn = {10538119}, year = {2004}, date = {2004-01-01}, journal = {NeuroImage}, abstract = {A high-dimensional shape transformation posed in a mass-preserving framework is used as a morphological signature of a brain image. Population differences with complex spatial patterns are then determined by applying a nonlinear support vector machine (SVM) pattern classification method to the morphological signatures. Significant reduction of the dimensionality of the morphological signatures is achieved via wavelet decomposition and feature reduction methods. Applying the method to MR images with simulated atrophy shows that the method can correctly detect subtle and spatially complex atrophy, even when the simulated atrophy represents only a 5% variation from the original image. Applying this method to actual MR images shows that brains can be correctly determined to be male or female with a successful classification rate of 97%, using the leave-one-out method. This proposed method also shows a high classification rate for old adults' age classification, even under difficult test scenarios. The main characteristic of the proposed methodology is that, by applying multivariate pattern classification methods, it can detect subtle and spatially complex patterns of morphological group differences which are often not detectable by voxel-based morphometric methods, because these methods analyze morphological measurements voxel-by-voxel and do not consider the entirety of the data simultaneously. textcopyright 2003 Elsevier Inc. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } A high-dimensional shape transformation posed in a mass-preserving framework is used as a morphological signature of a brain image. Population differences with complex spatial patterns are then determined by applying a nonlinear support vector machine (SVM) pattern classification method to the morphological signatures. Significant reduction of the dimensionality of the morphological signatures is achieved via wavelet decomposition and feature reduction methods. Applying the method to MR images with simulated atrophy shows that the method can correctly detect subtle and spatially complex atrophy, even when the simulated atrophy represents only a 5% variation from the original image. Applying this method to actual MR images shows that brains can be correctly determined to be male or female with a successful classification rate of 97%, using the leave-one-out method. This proposed method also shows a high classification rate for old adults' age classification, even under difficult test scenarios. The main characteristic of the proposed methodology is that, by applying multivariate pattern classification methods, it can detect subtle and spatially complex patterns of morphological group differences which are often not detectable by voxel-based morphometric methods, because these methods analyze morphological measurements voxel-by-voxel and do not consider the entirety of the data simultaneously. textcopyright 2003 Elsevier Inc. All rights reserved. |
Altinkaya, MA Effects of the autocorrelation matrix generation method on the model-based sinusoidal parameter estimators Journal Article Proceedings of the IEEE 12th Signal Processing and Communications …, 2004. @article{pop00019g, title = {Effects of the autocorrelation matrix generation method on the model-based sinusoidal parameter estimators}, author = {MA Altinkaya}, year = {2004}, date = {2004-01-01}, journal = {Proceedings of the IEEE 12th Signal Processing and Communications …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Kalkan, C; Altinkaya, MA Pearson system-based blind source separation for estimating non-Gaussian fading channels in CDMA communication Journal Article Proceedings of the IEEE 12th Signal Processing and Communications …, 2004. @article{pop00029c, title = {Pearson system-based blind source separation for estimating non-Gaussian fading channels in CDMA communication}, author = {C Kalkan and MA Altinkaya}, year = {2004}, date = {2004-01-01}, journal = {Proceedings of the IEEE 12th Signal Processing and Communications …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Kalkan, O Independent component analysis applications in CDMA systems Journal Article Izmir Institute of Technology, 2004. @article{pop00030f, title = {Independent component analysis applications in CDMA systems}, author = {O Kalkan}, year = {2004}, date = {2004-01-01}, journal = {Izmir Institute of Technology}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Karatay, O; Dinleyici, Salih M Low-cost free-space optical communication system design Inproceedings 2004. @inproceedings{Karatay2004, title = {Low-cost free-space optical communication system design}, author = {O Karatay and Salih M Dinleyici}, doi = {10.1109/siu.2004.1338627}, year = {2004}, date = {2004-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Dinleyici, MS; Akin, O 3-D switching fabric node design Journal Article IASTED Communications Systems and Networks, Spain, 2004. @article{pop00013e, title = {3-D switching fabric node design}, author = {MS Dinleyici and O Akin}, year = {2004}, date = {2004-01-01}, journal = {IASTED Communications Systems and Networks, Spain}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Karatay, O An alternative approach to free space optical communication link Journal Article Izmir Institute of Technology, 2004. @article{pop00014f, title = {An alternative approach to free space optical communication link}, author = {O Karatay}, year = {2004}, date = {2004-01-01}, journal = {Izmir Institute of Technology}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Uyar, E; Gümüştekin, Ş; Ozan, Ş; Çetin, L A computer controlled vision oriented robot manipulator for chess game Journal Article Proc. of Workshop on Research and Education in Control and Signal Processing …, 2004. @article{pop00016d, title = {A computer controlled vision oriented robot manipulator for chess game}, author = {E Uyar and Ş Gümüştekin and Ş Ozan and L Çetin}, year = {2004}, date = {2004-01-01}, journal = {Proc. of Workshop on Research and Education in Control and Signal Processing …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Ozkurt, N; Savaci, FA Signal synthesis using wavelet ridges Journal Article Proceedings of the IEEE 12th Signal Processing and Communications …, 2004. @article{pop00031cb, title = {Signal synthesis using wavelet ridges}, author = {N Ozkurt and FA Savaci}, year = {2004}, date = {2004-01-01}, journal = {Proceedings of the IEEE 12th Signal Processing and Communications …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Coman, I; Krol, A; Feiglin, D; Lipson, E; Mandel, J; Baum, K; Unlu, M; Li, W Intermodality nonrigid breast-image registration Journal Article 2004 2nd IEEE International Symposium on Biomedical Imaging: Nano to Macro …, 2004. @article{pop00006g, title = {Intermodality nonrigid breast-image registration}, author = {I Coman and A Krol and D Feiglin and E Lipson and J Mandel and K Baum and M Unlu and W Li}, year = {2004}, date = {2004-01-01}, journal = {2004 2nd IEEE International Symposium on Biomedical Imaging: Nano to Macro …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Çek, ME; Savacı, FA Rank kestirim yöntemi kullanarak SVD tabanlı gürültü filtreleme Journal Article IEEE, 2004. @article{pop00041bb, title = {Rank kestirim yöntemi kullanarak SVD tabanlı gürültü filtreleme}, author = {ME Çek and FA Savacı}, year = {2004}, date = {2004-01-01}, journal = {IEEE}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Cek, ME; Savaci, FA SVD based noise reduction using rank estimation method Journal Article Proceedings of the IEEE 12th Signal Processing and Communications …, 2004. @article{pop00052bb, title = {SVD based noise reduction using rank estimation method}, author = {ME Cek and FA Savaci}, year = {2004}, date = {2004-01-01}, journal = {Proceedings of the IEEE 12th Signal Processing and Communications …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
2003 |
Özbek, B; Ruyet, Le D; Bellanger, M On space-frequency block codes for unequal channels Journal Article Proc. 2nd COST 273 Workshop Broadband Wireless Local Access, 2003. @article{pop00014b, title = {On space-frequency block codes for unequal channels}, author = {B Özbek and Le D Ruyet and M Bellanger}, year = {2003}, date = {2003-01-01}, journal = {Proc. 2nd COST 273 Workshop Broadband Wireless Local Access}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Yüksel, K; Robette, L; Moeyaert, V; Froidure, JC OTDR-based monitoring method for passive optical networks Journal Article Proceedings of the Network & Optical Communications, pp. 255–261, 2003. @article{pop00015d, title = {OTDR-based monitoring method for passive optical networks}, author = {K Yüksel and L Robette and V Moeyaert and JC Froidure}, year = {2003}, date = {2003-01-01}, journal = {Proceedings of the Network & Optical Communications}, pages = {255--261}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Robette, L; Yuksel, K; Moeyaert, V; Hamoir, D La maintenace de réseau optique passif sur base de la technologie de la réflectométrie optique dans le domaine temporel Journal Article 22ème Journée Nationale d'Optique Guidée, pp. 351–353, 2003. @article{pop00055b, title = {La maintenace de réseau optique passif sur base de la technologie de la réflectométrie optique dans le domaine temporel}, author = {L Robette and K Yuksel and V Moeyaert and D Hamoir}, year = {2003}, date = {2003-01-01}, journal = {22ème Journée Nationale d'Optique Guidée}, pages = {351--353}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
OZBEK, B; Ruyet, Le D; Bellanger, M Non-orthogonal space-time block coding design for 3 transmit antennas Journal Article 19° Colloque sur le traitement du signal et des images, FRA, 2003 , 2003. @article{pop00099, title = {Non-orthogonal space-time block coding design for 3 transmit antennas}, author = {B OZBEK and Le D Ruyet and M Bellanger}, year = {2003}, date = {2003-01-01}, journal = {19° Colloque sur le traitement du signal et des images, FRA}, volume = {2003}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Karacali, Bilge; Snyder, Wesley Reconstructing discontinuous surfaces from a given gradient field using partial integrability Journal Article Computer Vision and Image Understanding, 2003, ISSN: 10773142. @article{Karacali2003, title = {Reconstructing discontinuous surfaces from a given gradient field using partial integrability}, author = {Bilge Karacali and Wesley Snyder}, doi = {10.1016/S1077-3142(03)00095-X}, issn = {10773142}, year = {2003}, date = {2003-01-01}, journal = {Computer Vision and Image Understanding}, abstract = {This paper describes an adaptive surface reconstruction method from a given gradient field that allows discontinuities in the solution. We first formalize a vector space projection technique to reconstruct a surface with a uniformly integrable gradient field that corresponds to the minimum norm solution in the gradient space over discrete imaging settings. Next, we generalize this technique to reconstruct minimum norm solution surfaces with partially integrable gradient fields, where partial integrability is characterized adaptively from the given gradient field using multi-scale gradient space expansions. The simulations on synthesized and real data using block processing techniques indicate that the proposed method provides fast and reliable surface reconstruction through accurate characterization of embedded partial integrability in a given gradient field. textcopyright 2003 Elsevier Inc. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper describes an adaptive surface reconstruction method from a given gradient field that allows discontinuities in the solution. We first formalize a vector space projection technique to reconstruct a surface with a uniformly integrable gradient field that corresponds to the minimum norm solution in the gradient space over discrete imaging settings. Next, we generalize this technique to reconstruct minimum norm solution surfaces with partially integrable gradient fields, where partial integrability is characterized adaptively from the given gradient field using multi-scale gradient space expansions. The simulations on synthesized and real data using block processing techniques indicate that the proposed method provides fast and reliable surface reconstruction through accurate characterization of embedded partial integrability in a given gradient field. textcopyright 2003 Elsevier Inc. All rights reserved. |
Karacali, Bilge; Krim, Hamid Fast minimization of structural risk by nearest neighbor rule Journal Article IEEE Transactions on Neural Networks, 2003, ISSN: 10459227. @article{Karacali2003a, title = {Fast minimization of structural risk by nearest neighbor rule}, author = {Bilge Karacali and Hamid Krim}, doi = {10.1109/TNN.2002.804315}, issn = {10459227}, year = {2003}, date = {2003-01-01}, journal = {IEEE Transactions on Neural Networks}, abstract = {In this paper, we present a novel nearest neighbor rule-based implementation of the structural risk minimization principle to address a generic classification problem. We propose a fast reference set thinning algorithm on the training data set similar to a support vector machine (SVM) approach. We then show that the nearest neighbor rule based on the reduced set implements the structural risk minimization principle, in a manner which does not involve selection of a convenient feature space. Simulation results on real data indicate that this method significantly reduces the computational cost of the conventional SVMs, and achieves a nearly comparable test error performance.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In this paper, we present a novel nearest neighbor rule-based implementation of the structural risk minimization principle to address a generic classification problem. We propose a fast reference set thinning algorithm on the training data set similar to a support vector machine (SVM) approach. We then show that the nearest neighbor rule based on the reduced set implements the structural risk minimization principle, in a manner which does not involve selection of a convenient feature space. Simulation results on real data indicate that this method significantly reduces the computational cost of the conventional SVMs, and achieves a nearly comparable test error performance. |
Dinleyici, Salih M An experimental work on optical component based on D-fiber/slab evanescent coupling structure Journal Article Optical and Quantum Electronics, 2003, ISSN: 03068919. @article{Dinleyici2003, title = {An experimental work on optical component based on D-fiber/slab evanescent coupling structure}, author = {Salih M Dinleyici}, doi = {10.1023/A:1021856108817}, issn = {03068919}, year = {2003}, date = {2003-01-01}, journal = {Optical and Quantum Electronics}, abstract = {Fiber/slab coupler structure has been exploited as a passive in-line optical fiber component for functions of filtering, intensity modulating and switching by many researchers. In this work a device based on the elliptic core D-fiber and polymer slab waveguide is proposed and its fabrication is experimentally investigated. The device is constructed by placing the polymer slab on the top of the flat side of the D-fiber, and then they are tested for transmission characteristics and polarization preserving properties for various configurations. The geometrical uniformity of the device is examined under Scanning Electron Microscope for the purpose of device performance evaluation. Potential usage of this device as an all-optical switch is also discussed at the end.}, keywords = {}, pubstate = {published}, tppubtype = {article} } Fiber/slab coupler structure has been exploited as a passive in-line optical fiber component for functions of filtering, intensity modulating and switching by many researchers. In this work a device based on the elliptic core D-fiber and polymer slab waveguide is proposed and its fabrication is experimentally investigated. The device is constructed by placing the polymer slab on the top of the flat side of the D-fiber, and then they are tested for transmission characteristics and polarization preserving properties for various configurations. The geometrical uniformity of the device is examined under Scanning Electron Microscope for the purpose of device performance evaluation. Potential usage of this device as an all-optical switch is also discussed at the end. |
Hamza, Ben A; Krim, Hamid; Karacali, Bilge Structural risk minimization using nearest neighbor rule Inproceedings Proceedings - IEEE International Conference on Multimedia and Expo, 2003, ISSN: 1945788X. @inproceedings{Hamza2003, title = {Structural risk minimization using nearest neighbor rule}, author = {Ben A Hamza and Hamid Krim and Bilge Karacali}, doi = {10.1109/ICME.2003.1221046}, issn = {1945788X}, year = {2003}, date = {2003-01-01}, booktitle = {Proceedings - IEEE International Conference on Multimedia and Expo}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Karacali, Bilge; Krim, Hamid A; Schick, Irvin C textlesstitletextgreaterWavelet-based methods in Global Positioning System signal trackingtextless/titletextgreater Inproceedings Wavelet Applications VII, 2003. @inproceedings{Karacali2003b, title = {textlesstitletextgreaterWavelet-based methods in Global Positioning System signal trackingtextless/titletextgreater}, author = {Bilge Karacali and Hamid A Krim and Irvin C Schick}, doi = {10.1117/12.381675}, year = {2003}, date = {2003-01-01}, booktitle = {Wavelet Applications VII}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Savaci, FA; Yalçin, ME; Güzeliş, C Steady-state analysis of nonlinearly coupled Chua's circuits with periodic input Journal Article International Journal of Bifurcation and Chaos, 13 (11), pp. 3395–3407, 2003. @article{pop00009bb, title = {Steady-state analysis of nonlinearly coupled Chua's circuits with periodic input}, author = {FA Savaci and ME Yalçin and C Güzeliş}, year = {2003}, date = {2003-01-01}, journal = {International Journal of Bifurcation and Chaos}, volume = {13}, number = {11}, pages = {3395--3407}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Savaci, Acar F; Goknar, I C Fault analysis and parameter identification in linear circuits in terms of topological matrices Inproceedings 2003. @inproceedings{AcarSavaci2003, title = {Fault analysis and parameter identification in linear circuits in terms of topological matrices}, author = {Acar F Savaci and I C Goknar}, doi = {10.1109/iscas.1988.15077}, year = {2003}, date = {2003-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
2002 |
Apaydın, MS; Guestrin, CE; Varma, C; Brutlag, DL; Latombe, JC Stochastic roadmap simulation for the study of ligand-protein interactions Journal Article Bioinformatics 18 (suppl_2), S18-S, 26 , 2002. @article{pop00020i, title = {Stochastic roadmap simulation for the study of ligand-protein interactions}, author = {MS Apaydın and CE Guestrin and C Varma and DL Brutlag and JC Latombe}, year = {2002}, date = {2002-01-01}, journal = {Bioinformatics 18 (suppl_2), S18-S}, volume = {26}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Balantekin, Mujdat; Atalar, A Simulations of switching vibrating cantilever in atomic force microscopy Journal Article Applied Surface Science, 2002, ISSN: 01694332. @article{Balantekin2002, title = {Simulations of switching vibrating cantilever in atomic force microscopy}, author = {Mujdat Balantekin and A Atalar}, doi = {10.1016/S0169-4332(02)01083-8}, issn = {01694332}, year = {2002}, date = {2002-01-01}, journal = {Applied Surface Science}, abstract = {We analyze the steady state tip sample interaction in atomic force microscopy by using an electrical circuit simulator. The phase shift between the cantilever excitation and tip, and the amplitude versus distance curves are obtained with sample stiffness as a parameter. The height shifts and hysteresis in amplitude and phase curves are observed as a result of the influence of the force between the tip and the sample. The damping and switching mechanisms are explained using the force traces obtained from simulations. The oscillation amplitude dependence of operating mode is inspected. We find that improper selection of the free tip oscillation amplitude is the cause of operating state transitions. textcopyright 2002 Elsevier Science B.V. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } We analyze the steady state tip sample interaction in atomic force microscopy by using an electrical circuit simulator. The phase shift between the cantilever excitation and tip, and the amplitude versus distance curves are obtained with sample stiffness as a parameter. The height shifts and hysteresis in amplitude and phase curves are observed as a result of the influence of the force between the tip and the sample. The damping and switching mechanisms are explained using the force traces obtained from simulations. The oscillation amplitude dependence of operating mode is inspected. We find that improper selection of the free tip oscillation amplitude is the cause of operating state transitions. textcopyright 2002 Elsevier Science B.V. All rights reserved. |
Altinkaya, Mustafa A; Delic, Hakan; Sankur, Bülent; Anarim, Emin Subspace-based frequency estimation of sinusoidal signals in alpha-stable noise Journal Article Signal Processing, 2002, ISSN: 01651684. @article{Altinkaya2002, title = {Subspace-based frequency estimation of sinusoidal signals in alpha-stable noise}, author = {Mustafa A Altinkaya and Hakan Delic and Bülent Sankur and Emin Anarim}, doi = {10.1016/S0165-1684(02)00313-4}, issn = {01651684}, year = {2002}, date = {2002-01-01}, journal = {Signal Processing}, abstract = {In the frequency estimation of sinusoidal signals observed in impulsive noise environments, techniques based on Gaussian noise assumption are unsuccessful. One possible way to find better estimates is to model the noise as an alpha-stable process and to use the fractional lower order statistics (FLOS) of the data to estimate the signal parameters. In this work, we propose a FLOS-based statistical average, the generalized covariation coefficient (GCC). The GCCs of multiple sinusoids for unity moment order in S$alpha$S noise attain the same form as the covariance expressions of multiple sinusoids in white Gaussian noise. The subspace-based frequency estimators FLOS-multiple signal classification (MUSIC) and FLOS-Bartlett are applied to the GCC matrix of the data. On the other hand, we show that the multiple sinusoids in S$alpha$S noise can also be modeled as a stable autoregressive moving average process approximated by a higher order stable autoregressive (AR) process. Using the GCCs of the data, we obtain FLOS versions of Tufts-Kumaresan (TK) and minimum norm (MN) estimators, which are based on the AR model. The simulation results show that techniques employing lower order statistics are superior to their second-order statistics (SOS)-based counterparts, especially when the noise exhibits a strong impulsive attitude. Among the estimators, FLOS-MUSIC shows a robust performance. It behaves comparably to MUSIC in non-impulsive noise environments, and both in impulsive and non-impulsive high-resolution scenarios. Furthermore, it offers a significant advantage at relatively high levels of impulsive noise contamination for distantly located sinusoidal frequencies. textcopyright 2002 Elsevier Science B.V. All rights reserved.}, keywords = {}, pubstate = {published}, tppubtype = {article} } In the frequency estimation of sinusoidal signals observed in impulsive noise environments, techniques based on Gaussian noise assumption are unsuccessful. One possible way to find better estimates is to model the noise as an alpha-stable process and to use the fractional lower order statistics (FLOS) of the data to estimate the signal parameters. In this work, we propose a FLOS-based statistical average, the generalized covariation coefficient (GCC). The GCCs of multiple sinusoids for unity moment order in S$alpha$S noise attain the same form as the covariance expressions of multiple sinusoids in white Gaussian noise. The subspace-based frequency estimators FLOS-multiple signal classification (MUSIC) and FLOS-Bartlett are applied to the GCC matrix of the data. On the other hand, we show that the multiple sinusoids in S$alpha$S noise can also be modeled as a stable autoregressive moving average process approximated by a higher order stable autoregressive (AR) process. Using the GCCs of the data, we obtain FLOS versions of Tufts-Kumaresan (TK) and minimum norm (MN) estimators, which are based on the AR model. The simulation results show that techniques employing lower order statistics are superior to their second-order statistics (SOS)-based counterparts, especially when the noise exhibits a strong impulsive attitude. Among the estimators, FLOS-MUSIC shows a robust performance. It behaves comparably to MUSIC in non-impulsive noise environments, and both in impulsive and non-impulsive high-resolution scenarios. Furthermore, it offers a significant advantage at relatively high levels of impulsive noise contamination for distantly located sinusoidal frequencies. textcopyright 2002 Elsevier Science B.V. All rights reserved. |
Karacali, Bilge; Snyder, Wesley Automatic target detection using multispectral imaging Inproceedings Proceedings - Applied Imagery Pattern Recognition Workshop, 2002, ISSN: 21642516. @inproceedings{Karacali2002, title = {Automatic target detection using multispectral imaging}, author = {Bilge Karacali and Wesley Snyder}, doi = {10.1109/AIPR.2002.1182255}, issn = {21642516}, year = {2002}, date = {2002-01-01}, booktitle = {Proceedings - Applied Imagery Pattern Recognition Workshop}, abstract = {We propose using multispectral imaging for on-the-fly target detection and classification instead of hyperspectral imaging. We initially pose the target detection problem as a classification problem with classes identified as target and clutter. The classification data consists of multispectral observations of the region of interest, focusing on visual and infrared wavelengths. We then solve this classification problem using nearest neighbor rule, support vector machines, and maximum likelihood classification. Simulation results on real data indicate that information from a multispectral sensor can offer better performance than both single band and hyperspectral sensors, also showing that costly hyperspectral analysis performance can be attained onboard a small airborne platform such as a smart missile using cost-effective multispectral sensors.}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } We propose using multispectral imaging for on-the-fly target detection and classification instead of hyperspectral imaging. We initially pose the target detection problem as a classification problem with classes identified as target and clutter. The classification data consists of multispectral observations of the region of interest, focusing on visual and infrared wavelengths. We then solve this classification problem using nearest neighbor rule, support vector machines, and maximum likelihood classification. Simulation results on real data indicate that information from a multispectral sensor can offer better performance than both single band and hyperspectral sensors, also showing that costly hyperspectral analysis performance can be attained onboard a small airborne platform such as a smart missile using cost-effective multispectral sensors. |
Altınkaya, MA; Deliç, H; Sankur, B; Anarım, E; Swami, A; Sadler, BM; Gini, F; ..., Special Section on Signal Processing with Heavy-tailed Models Journal Article Signal Processing, 82 (12), 2002. @article{pop00031d, title = {Special Section on Signal Processing with Heavy-tailed Models}, author = {MA Altınkaya and H Deliç and B Sankur and E Anarım and A Swami and BM Sadler and F Gini and ...}, year = {2002}, date = {2002-01-01}, journal = {Signal Processing}, volume = {82}, number = {12}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Oruç, Ö Differential and coherent detection schemes for space-time block codes Journal Article Izmir Institute of Technology, 2002. @article{pop00032c, title = {Differential and coherent detection schemes for space-time block codes}, author = {Ö Oruç}, year = {2002}, date = {2002-01-01}, journal = {Izmir Institute of Technology}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Taban, A Space-time coding for CDMA-based wireless communication systems Journal Article Izmir Institute of Technology, 2002. @article{pop00033d, title = {Space-time coding for CDMA-based wireless communication systems}, author = {A Taban}, year = {2002}, date = {2002-01-01}, journal = {Izmir Institute of Technology}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Dinleyici, MS All-optical switching based on grating written photorefractive slab/fiber waveguide coupler Journal Article Proceedings of LFNM 2002. 4th International Workshop on Laser and Fiber …, 2002. @article{pop00028d, title = {All-optical switching based on grating written photorefractive slab/fiber waveguide coupler}, author = {MS Dinleyici}, year = {2002}, date = {2002-01-01}, journal = {Proceedings of LFNM 2002. 4th International Workshop on Laser and Fiber …}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Özkurt, Nalan; Savaci, Acar F; Gündüzalp, Mustafa The circuit implementation of a wavelet function approximator Journal Article Analog Integrated Circuits and Signal Processing, 2002, ISSN: 09251030. @article{Ozkurt2002, title = {The circuit implementation of a wavelet function approximator}, author = {Nalan Özkurt and Acar F Savaci and Mustafa Gündüzalp}, doi = {10.1023/A:1019582227344}, issn = {09251030}, year = {2002}, date = {2002-01-01}, journal = {Analog Integrated Circuits and Signal Processing}, abstract = {This paper describes the analog synthesis of a wavelet function approximator using sigmoidal mother wavelet.Any finite energy multivariate function can be approximated by this analog circuit using the multiresolution approximation property of thewavelet decomposition.Theapproximator circuit includes bipolar junction transistors, operational amplifiers and linear passive circuit elements}, keywords = {}, pubstate = {published}, tppubtype = {article} } This paper describes the analog synthesis of a wavelet function approximator using sigmoidal mother wavelet.Any finite energy multivariate function can be approximated by this analog circuit using the multiresolution approximation property of thewavelet decomposition.Theapproximator circuit includes bipolar junction transistors, operational amplifiers and linear passive circuit elements |
Mocan, B A novel method of routing in all-optical packet switched networks Journal Article Izmir Institute of Technology, 2002. @article{pop00029d, title = {A novel method of routing in all-optical packet switched networks}, author = {B Mocan}, year = {2002}, date = {2002-01-01}, journal = {Izmir Institute of Technology}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Arik, S; Kilinc, A; Savaci, Acar F Global asymptotic stability of discrete-time cellular neural networks Inproceedings 2002. @inproceedings{Arik2002, title = {Global asymptotic stability of discrete-time cellular neural networks}, author = {S Arik and A Kilinc and Acar F Savaci}, doi = {10.1109/cnna.1998.685329}, year = {2002}, date = {2002-01-01}, keywords = {}, pubstate = {published}, tppubtype = {inproceedings} } |
Özkurt, N; Savacı, FA; Gündüzalp, M Bir Dalgacık İşlev Yaklaşım Devresi Gerçekleme Önerisi Journal Article SIU, 2002. @article{pop00042db, title = {Bir Dalgacık İşlev Yaklaşım Devresi Gerçekleme Önerisi}, author = {N Özkurt and FA Savacı and M Gündüzalp}, year = {2002}, date = {2002-01-01}, journal = {SIU}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
2001 |
Özbek, ME Optical routing in packet switched networks Journal Article Izmir Institute of Technology, 2001. @article{pop00010e, title = {Optical routing in packet switched networks}, author = {ME Özbek}, year = {2001}, date = {2001-01-01}, journal = {Izmir Institute of Technology}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Özkurt, N; Savacı, F Wavelet analysis of the generalized Chua’s circuit Journal Article Proc. 9th Workshop on Nonlinear Dynamics of Electronic Systems, 2001 , pp. 227–230, 2001. @article{pop00020bb, title = {Wavelet analysis of the generalized Chua’s circuit}, author = {N Özkurt and F Savacı}, year = {2001}, date = {2001-01-01}, journal = {Proc. 9th Workshop on Nonlinear Dynamics of Electronic Systems}, volume = {2001}, pages = {227--230}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
2000 |
Dinleyici, MS Device Length Requirement in Slab Fiber Evanescent Coupler Journal Article Fiber & Integrated Optics, 19 (1), pp. 87–95, 2000. @article{pop00015f, title = {Device Length Requirement in Slab Fiber Evanescent Coupler}, author = {MS Dinleyici}, year = {2000}, date = {2000-01-01}, journal = {Fiber & Integrated Optics}, volume = {19}, number = {1}, pages = {87--95}, keywords = {}, pubstate = {published}, tppubtype = {article} } |
Gumustekin, S New methods for the construction of panoramic and plenoptic images with computer vision applications. Miscellaneous 2000. @misc{pop00009eb, title = {New methods for the construction of panoramic and plenoptic images with computer vision applications.}, author = {S Gumustekin}, year = {2000}, date = {2000-01-01}, keywords = {}, pubstate = {published}, tppubtype = {misc} } |
Kustepeli, Alp; Martin, Anthony Q On the Splitting Parameter in the Ewald Method Journal Article IEEE Microwave and Guided Wave Letters, 2000, ISSN: 10518207. @article{Kustepeli2000, title = {On the Splitting Parameter in the Ewald Method}, author = {Alp Kustepeli and Anthony Q Martin}, doi = {10.1109/75.850366}, issn = {10518207}, year = {2000}, date = {2000-01-01}, journal = {IEEE Microwave and Guided Wave Letters}, keywords = {}, pubstate = {published}, tppubtype = {article} } |