Pub Date : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130254
Umit Aydin, Y. Serinağaoğlu
At this study the main motivation is to solve inverse problem of ECG with Kalman filter. In order to obtain feasible solutions determination of the state transition matrix (STM) correctly is vital. In literature the STM is usually found by using the test data itself which is not a realistic scenario. The major goal of this study is to determine STM without using test data. For that purpose a two stage method is suggested. At the first step the probability density function (pdf) is calculated using training sets and then this pdf is used to find Bayes-MAP solution which uses only spatial information. At the second step, the Bayes-MAP solution is used to find STM and later on, that STM is used in Kalman filter to obtain final results. It is seen that the results obtained with this method are better then normal Bayes-MAP results and the errors are within acceptable limits. So it is concluded that the usage of Bayes-MAP solutions in STM determination is a serious alternative for STM estimation.
{"title":"Estimation of state transition matrix in the Kalman filter based inverse ECG solution with the help of training sets","authors":"Umit Aydin, Y. Serinağaoğlu","doi":"10.1109/BIYOMUT.2009.5130254","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130254","url":null,"abstract":"At this study the main motivation is to solve inverse problem of ECG with Kalman filter. In order to obtain feasible solutions determination of the state transition matrix (STM) correctly is vital. In literature the STM is usually found by using the test data itself which is not a realistic scenario. The major goal of this study is to determine STM without using test data. For that purpose a two stage method is suggested. At the first step the probability density function (pdf) is calculated using training sets and then this pdf is used to find Bayes-MAP solution which uses only spatial information. At the second step, the Bayes-MAP solution is used to find STM and later on, that STM is used in Kalman filter to obtain final results. It is seen that the results obtained with this method are better then normal Bayes-MAP results and the errors are within acceptable limits. So it is concluded that the usage of Bayes-MAP solutions in STM determination is a serious alternative for STM estimation.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122480544","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130311
H. Dogan, O. Dicle, C. Guzelis
Prior to the liver transplantation and tumor resection operations, the extraction of the vessel system which specifies the segments of the liver, from the Computed Tomography Angiography (CTA) images is an important organ segmentation task. In this paper, the computer experiment results on the application of the Hessian based vessel filter for the extraction of the liver vessels and the labeling of the main vessels are presented.
{"title":"Extraction of the liver vessels from the abdomen CTA images by Hessian-based vessel filter","authors":"H. Dogan, O. Dicle, C. Guzelis","doi":"10.1109/BIYOMUT.2009.5130311","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130311","url":null,"abstract":"Prior to the liver transplantation and tumor resection operations, the extraction of the vessel system which specifies the segments of the liver, from the Computed Tomography Angiography (CTA) images is an important organ segmentation task. In this paper, the computer experiment results on the application of the Hessian based vessel filter for the extraction of the liver vessels and the labeling of the main vessels are presented.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121751311","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130256
S. Gune, K. Polat, M. Dursun, Ş. Yosunkaya
Sleep staging has an important role in determining sleep disorders such as sleepiness, human fatigue etc. Sleep staging is generally done according to Rechtschaffen and Kales standard (RKS) using EEG signal obtained from PSG signals taken from patient subjects who come with any sleep disorders. Sleep stages are generally divided into three stages including awake, REM and N-REM (stage 1, stage 2, and stage 3). In this study, time domain features of EEG, EOG of right and left eyes, and chin EMG signals belonging to sleep stages were investigated and correlation between these time domain features and sleep stages was calculated. The used time domain features are mean value, standard deviation, peak value, skewness, kurtosis, and shape factor belonging to EEG, EOG of right and left eyes, and chin EMG signals. In experimental studies, PSG recordings of 3 subjects were taken and average recording time of 6.22 h, total recording time was 18.67 h. When investigated correlation coefficients, it is seen that skewness feature in time domain features of EEG signal, standard deviation feature in time domain features of EOG signals belonging to right and left eyes, and mean value feature in time domain features of chin EMG signal were more correlated with sleep stages than other features. Consequently, a feature vector can be constituted combining features determined from time domain features of EEG, EOG belonging to right and left eyes, and chin EMG signals. This obtained feature vector can be easily used in distinguishing sleep stages.
{"title":"Examining the relevance with sleep stages of time domain features of EEG, EOG, and chin EMG signals","authors":"S. Gune, K. Polat, M. Dursun, Ş. Yosunkaya","doi":"10.1109/BIYOMUT.2009.5130256","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130256","url":null,"abstract":"Sleep staging has an important role in determining sleep disorders such as sleepiness, human fatigue etc. Sleep staging is generally done according to Rechtschaffen and Kales standard (RKS) using EEG signal obtained from PSG signals taken from patient subjects who come with any sleep disorders. Sleep stages are generally divided into three stages including awake, REM and N-REM (stage 1, stage 2, and stage 3). In this study, time domain features of EEG, EOG of right and left eyes, and chin EMG signals belonging to sleep stages were investigated and correlation between these time domain features and sleep stages was calculated. The used time domain features are mean value, standard deviation, peak value, skewness, kurtosis, and shape factor belonging to EEG, EOG of right and left eyes, and chin EMG signals. In experimental studies, PSG recordings of 3 subjects were taken and average recording time of 6.22 h, total recording time was 18.67 h. When investigated correlation coefficients, it is seen that skewness feature in time domain features of EEG signal, standard deviation feature in time domain features of EOG signals belonging to right and left eyes, and mean value feature in time domain features of chin EMG signal were more correlated with sleep stages than other features. Consequently, a feature vector can be constituted combining features determined from time domain features of EEG, EOG belonging to right and left eyes, and chin EMG signals. This obtained feature vector can be easily used in distinguishing sleep stages.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"267 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133760914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130268
G. Yilmaz, E. Bayraktar, H. Kulah
Since fabrication of microchips by MEMS technology has emerged, microchips that can interact with biological samples like virus, bacteria, DNA has been developed. Considering the advantages such as cost, dimension and compatibility with IC fabrication, these chips have found specific application areas. Microfluids and microfluidics constitute one of the major research areas of this emerging field, BioMEMS. Micro mixers have become an important component of BioMEMS which are designed for microfluidics applications. Fluids demonstrate two types of flow regime, laminar and turbulent. Turbulent flow is more advantageous than laminar flow when mixing is considered. Creating turbulent flow within microchannels, commonly used in BioMEMS devices, is a challenging task as scaling into the micro domain causes fluids to mix solely by diffusion. This study presents a method for mixing in micro environment based on chaotic advection. The proposed micro mixer makes use of the turbulent flow induced by bubbles which are created by thermal actuation based on joule heating principle on gold electrodes.
{"title":"Design and fabrication of a chaotic mixer for BioMEMS applications","authors":"G. Yilmaz, E. Bayraktar, H. Kulah","doi":"10.1109/BIYOMUT.2009.5130268","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130268","url":null,"abstract":"Since fabrication of microchips by MEMS technology has emerged, microchips that can interact with biological samples like virus, bacteria, DNA has been developed. Considering the advantages such as cost, dimension and compatibility with IC fabrication, these chips have found specific application areas. Microfluids and microfluidics constitute one of the major research areas of this emerging field, BioMEMS. Micro mixers have become an important component of BioMEMS which are designed for microfluidics applications. Fluids demonstrate two types of flow regime, laminar and turbulent. Turbulent flow is more advantageous than laminar flow when mixing is considered. Creating turbulent flow within microchannels, commonly used in BioMEMS devices, is a challenging task as scaling into the micro domain causes fluids to mix solely by diffusion. This study presents a method for mixing in micro environment based on chaotic advection. The proposed micro mixer makes use of the turbulent flow induced by bubbles which are created by thermal actuation based on joule heating principle on gold electrodes.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134346703","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130313
Tuba Durmaz, S. Erkut, Dilek Cokeliler
In recent years, fibers are used for improving mechanical strength of acrylic-based resin which used for construction of protheses frequently. Improvement of the fiber- matrix interfase is a very important approach at redevelopment of mechanical properties. In this study, glass fibers are modified by radiofrequency (RF) plasma technique with using different monomers. Silane based monomer glisitoxypropyltrimethiloxysilane and amine based ethylenediamine (EDA)are polimerized on the glass fibers in plasma environment for application of two different approaches (hydrophobic/hydrophobic). Surface modification application is optimized with increasing power and exposure time parameters, which are used for low vacuum RF glow discharge. The change of surface properties for glass fibers are characterized by measurement of static contact angle and bending strain of fiber-acrylic composites are measured with 3 point bending device. While the cost of bending strain of the composites, which is prepared by virgin glass fibers, is 127.9±9 MPa, the maximum mechanical strength has been obtained at amine based plasma polymerization technique (150.2±4 MPa). The mechanical strenght is improved according to the working parameters that are used in silane based plasma polymerisation technique (141.2±7 MPa, power: 40W, Exposure Time: 30 min) It's proved with contact angle measurement that gaining less hydrofobic property to the surface is an appropriate approach.
{"title":"Improvement of mechanical performances by plasma polymerisation technique for composite biomaterials","authors":"Tuba Durmaz, S. Erkut, Dilek Cokeliler","doi":"10.1109/BIYOMUT.2009.5130313","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130313","url":null,"abstract":"In recent years, fibers are used for improving mechanical strength of acrylic-based resin which used for construction of protheses frequently. Improvement of the fiber- matrix interfase is a very important approach at redevelopment of mechanical properties. In this study, glass fibers are modified by radiofrequency (RF) plasma technique with using different monomers. Silane based monomer glisitoxypropyltrimethiloxysilane and amine based ethylenediamine (EDA)are polimerized on the glass fibers in plasma environment for application of two different approaches (hydrophobic/hydrophobic). Surface modification application is optimized with increasing power and exposure time parameters, which are used for low vacuum RF glow discharge. The change of surface properties for glass fibers are characterized by measurement of static contact angle and bending strain of fiber-acrylic composites are measured with 3 point bending device. While the cost of bending strain of the composites, which is prepared by virgin glass fibers, is 127.9±9 MPa, the maximum mechanical strength has been obtained at amine based plasma polymerization technique (150.2±4 MPa). The mechanical strenght is improved according to the working parameters that are used in silane based plasma polymerisation technique (141.2±7 MPa, power: 40W, Exposure Time: 30 min) It's proved with contact angle measurement that gaining less hydrofobic property to the surface is an appropriate approach.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133375520","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130365
Mustafa Doğan, Okan Karatay, Dilek Cokeliler, I. Kocum
Various methods for fabricating nanoscale polymeric fibers are investigated at large, e.g. tissue engineering . Electrospinning is the most versatile process among them. Materials such as polymer, composites and metal nanofibres have been fabricated with electrospinning techniques. It is important that many parameters and post, pre-processes should be investigated thoroughly to be able to optimize the method. Characteristics of the electrostatic field, and polymer solution constitute the main design criteria. The proposed experimental setup has been implemented with newly designed high voltage power suply which can be adjusted resiliently in frequency and power amplitude.
{"title":"Design and Implementation of Electrospinning System","authors":"Mustafa Doğan, Okan Karatay, Dilek Cokeliler, I. Kocum","doi":"10.1109/BIYOMUT.2009.5130365","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130365","url":null,"abstract":"Various methods for fabricating nanoscale polymeric fibers are investigated at large, e.g. tissue engineering . Electrospinning is the most versatile process among them. Materials such as polymer, composites and metal nanofibres have been fabricated with electrospinning techniques. It is important that many parameters and post, pre-processes should be investigated thoroughly to be able to optimize the method. Characteristics of the electrostatic field, and polymer solution constitute the main design criteria. The proposed experimental setup has been implemented with newly designed high voltage power suply which can be adjusted resiliently in frequency and power amplitude.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134069884","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130356
Gözde Ulutagay, E. Nasibov
In this study, FCM (Fuzzy c-Means) and FN-DBSCAN (Fuzzy Neighborhood DBSCAN) based algorithms are handled in order to use clustering methods in the determination of the stage values of BIS series data. The FN-DBSCAN algorithm is advantageous in such a way that it integrates the speed of the well-known DBSCAN (Density Based Spatial Clustering of Applications with Noise) and the robustness of the NRFJP (Noise-Robust Fuzzy Joint Points) algorithms. Such a property provides an advantage also in the detection of stable interval epochs. As a result of the computational experiments, we can conclude that FN-DBSCAN-based algorithm gives more realistic results than the FCM-based algorithm to recognize the stable duration intervals and the BIS stages in the measurement series.
{"title":"Detection of BIS stage levels via fuzzy clustering approach","authors":"Gözde Ulutagay, E. Nasibov","doi":"10.1109/BIYOMUT.2009.5130356","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130356","url":null,"abstract":"In this study, FCM (Fuzzy c-Means) and FN-DBSCAN (Fuzzy Neighborhood DBSCAN) based algorithms are handled in order to use clustering methods in the determination of the stage values of BIS series data. The FN-DBSCAN algorithm is advantageous in such a way that it integrates the speed of the well-known DBSCAN (Density Based Spatial Clustering of Applications with Noise) and the robustness of the NRFJP (Noise-Robust Fuzzy Joint Points) algorithms. Such a property provides an advantage also in the detection of stable interval epochs. As a result of the computational experiments, we can conclude that FN-DBSCAN-based algorithm gives more realistic results than the FCM-based algorithm to recognize the stable duration intervals and the BIS stages in the measurement series.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125403418","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130382
T. Endogan, A. Kiziltay, N. Hasirci
Bone cements are used in orthopaedic surgery and dentistry, and the commonly used commercial ones are prepared from poly (methylmethacrylate) (PMMA). In orthopaedic surgery bone cements are used as filling agents for the treatment of damaged tissues and they are used to stabilize the prosthesis by providing the mechanical interlock between bone and metal during the use of metal prothesis and to provide the homogeneous distribution of applied load. In this study, bone cements compositions were prepared by using two different PMMA (microspheres prepared by suspension polymerization and ground and sieved PMMA particles). Compositions were prepared by addition of hydroxyapatite (HA) as inorganic load carrying substance, and barium sulphate (BaSO4) as opacifier. To increase biocompatibility of the prepared bone cements, natural polymer chitosan was added. It was observed that addition of chitosan had a positive effect on mechanical properties.
{"title":"Preparation and characterization of chitosan containing acrylic bone cement formulations","authors":"T. Endogan, A. Kiziltay, N. Hasirci","doi":"10.1109/BIYOMUT.2009.5130382","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130382","url":null,"abstract":"Bone cements are used in orthopaedic surgery and dentistry, and the commonly used commercial ones are prepared from poly (methylmethacrylate) (PMMA). In orthopaedic surgery bone cements are used as filling agents for the treatment of damaged tissues and they are used to stabilize the prosthesis by providing the mechanical interlock between bone and metal during the use of metal prothesis and to provide the homogeneous distribution of applied load. In this study, bone cements compositions were prepared by using two different PMMA (microspheres prepared by suspension polymerization and ground and sieved PMMA particles). Compositions were prepared by addition of hydroxyapatite (HA) as inorganic load carrying substance, and barium sulphate (BaSO4) as opacifier. To increase biocompatibility of the prepared bone cements, natural polymer chitosan was added. It was observed that addition of chitosan had a positive effect on mechanical properties.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132195322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130386
M. Ozgoren, O. Bayazit, Ugras Erdogan, A. Oniz
Dichotic Listening (DL) paradigm which indicates the brain asymmetry behaviorally is a non-invasive neurocognitive method. Phonetic combinations are used in this method. During the DL paradigm, recently developed system is able to mark the time point on the continuous electroencephalography (EEG) at which the DL stimulus is applied to the person in real time. By applying this new method, DL paradigm, we can evaluate the event related potentials of each ear advantages. Also we can elucidate how auditory system processes the knowledge. In this preliminary study, the main aim was to apply the standardized “Low Resolution Electromagnetic Tomography“ (sLORETA) method to EEG data of DL paradigm. Secondly, sLORETA was applied to different ear advantage (heteronymous and homonymous) event related potentials (ERPs) as a new approach. The preliminary results indicate that for the heteronymous condition the activation found in the superior temporal gyrus in the early stages, moves to central frontal gyrus in the late stages. The differences between the conditions of heteronymous and homonymous arise in frontal activation in the late stages. These findings which indicate the spatial-temporal resolution of the brain's dynamic processing can be beneficial for the clinical applications.
{"title":"EEG and sLORETA: The Dichotic Listening test preliminary results","authors":"M. Ozgoren, O. Bayazit, Ugras Erdogan, A. Oniz","doi":"10.1109/BIYOMUT.2009.5130386","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130386","url":null,"abstract":"Dichotic Listening (DL) paradigm which indicates the brain asymmetry behaviorally is a non-invasive neurocognitive method. Phonetic combinations are used in this method. During the DL paradigm, recently developed system is able to mark the time point on the continuous electroencephalography (EEG) at which the DL stimulus is applied to the person in real time. By applying this new method, DL paradigm, we can evaluate the event related potentials of each ear advantages. Also we can elucidate how auditory system processes the knowledge. In this preliminary study, the main aim was to apply the standardized “Low Resolution Electromagnetic Tomography“ (sLORETA) method to EEG data of DL paradigm. Secondly, sLORETA was applied to different ear advantage (heteronymous and homonymous) event related potentials (ERPs) as a new approach. The preliminary results indicate that for the heteronymous condition the activation found in the superior temporal gyrus in the early stages, moves to central frontal gyrus in the late stages. The differences between the conditions of heteronymous and homonymous arise in frontal activation in the late stages. These findings which indicate the spatial-temporal resolution of the brain's dynamic processing can be beneficial for the clinical applications.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132290451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2009-05-20DOI: 10.1109/BIYOMUT.2009.5130343
Firat Dogan, M. S. Çelebi
The soft tissues are considered as complex materials which are difficult to be modeled due to their nonlinear geometric and material properties, their multilayer structures, large displacements, anisotropic, nonhomogenous and viscoelastic material properties. This study focuses on the error minimization and converge problem in predicting the non-unique material parameters of quasi-linear (QLV) integral form by Fung [5] which is used in modeling viscoelastic material properties of soft tissues. The solution is improved by using refined nonlinear optimization method.
{"title":"Estimation of quasi-linear viscoelastic material parameters using nonlinear optimization method","authors":"Firat Dogan, M. S. Çelebi","doi":"10.1109/BIYOMUT.2009.5130343","DOIUrl":"https://doi.org/10.1109/BIYOMUT.2009.5130343","url":null,"abstract":"The soft tissues are considered as complex materials which are difficult to be modeled due to their nonlinear geometric and material properties, their multilayer structures, large displacements, anisotropic, nonhomogenous and viscoelastic material properties. This study focuses on the error minimization and converge problem in predicting the non-unique material parameters of quasi-linear (QLV) integral form by Fung [5] which is used in modeling viscoelastic material properties of soft tissues. The solution is improved by using refined nonlinear optimization method.","PeriodicalId":119026,"journal":{"name":"2009 14th National Biomedical Engineering Meeting","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133403096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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