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Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference最新文献

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Use of ventilator driven forced oscillations for characterizing human respiratory mechanics at low frequencies 使用呼吸机驱动的强迫振荡来表征低频的人体呼吸力学
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154586
David W. Kaczka, K. Yang, G. Barnas, K. Lutchen
{"title":"Use of ventilator driven forced oscillations for characterizing human respiratory mechanics at low frequencies","authors":"David W. Kaczka, K. Yang, G. Barnas, K. Lutchen","doi":"10.1109/NEBC.1991.154586","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154586","url":null,"abstract":"Frequency domain and offline and online time domain techniques are compared to estimate respiratory mechanical properties using standard ventilator waveforms at low frequencies. Both methods are shown to yield consistent parameter estimates for a simple series RC model and pure sine wave input. However, they could not accurately predict frequency dependence of respiratory resistance from 0 to 1 Hz when using a step flow waveform. This behavior is traced to signal-to-noise limitations and nonlinearities.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127236167","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}
引用次数: 0
Two and three-dimensional motion models for the left-ventricular wall 左室壁二维和三维运动模型
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154642
Amir A. Amini, R. Owen, P. Anandan, J S Duncan
{"title":"Two and three-dimensional motion models for the left-ventricular wall","authors":"Amir A. Amini, R. Owen, P. Anandan, J S Duncan","doi":"10.1109/NEBC.1991.154642","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154642","url":null,"abstract":"The authors present a unified framework for visual motion tracking of nonrigid objects with specific applications to the left ventricular endocardial wall motion. The theory is based on differential geometry and considers both two-dimensional contours and three-dimensional surfaces and in each case uses an elastic model of the object with constraints on the types of motion allowed for tracking the movement. The basic theme in both two- and three-dimensional analysis is to match shape properties in consecutive time instances and deduce quantitative information about the motion of the wall.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133308691","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}
引用次数: 0
Effects of heat and pressure on surface light reflectance at 660 and 880 nm 热和压力对660和880 nm表面光反射率的影响
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154618
J. Abrahams, S. Bhattacharyya, L. Ostrander, W. Cui
{"title":"Effects of heat and pressure on surface light reflectance at 660 and 880 nm","authors":"J. Abrahams, S. Bhattacharyya, L. Ostrander, W. Cui","doi":"10.1109/NEBC.1991.154618","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154618","url":null,"abstract":"Presented is an analysis of changes in reflectance at the tissue surface resulting from heat-induced hyperemia and from applied pressure at the skin surface. Optical reflectance measurements are at wavelengths of 660 nm (red) and 880 nm (infrared). Human subject data consist of in vivo measurements from the calf of the leg. An index is calculated which is a logarithm of the ratio of reflected light intensity before and after stimulus application at each wavelength. The slope of the index curve, plotted as a function of source-detector separation, is related to the expected depth dependent physiological changes, in tissue blood fractional volume and tissue blood oxygen saturation.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114074044","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}
引用次数: 1
Harmonic analysis of binaural interaction potentials 双耳相互作用势的谐波分析
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154556
M. Psaltikidou, R. Gaumond
{"title":"Harmonic analysis of binaural interaction potentials","authors":"M. Psaltikidou, R. Gaumond","doi":"10.1109/NEBC.1991.154556","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154556","url":null,"abstract":"A general response model is proposed which suggests that low frequency tones in masking noise may be a useful test stimulus to differentiate between binaural interaction (BI) responses from various superior olivary complex cell types. The model consists of an element acting on input signals from the cochlear nucleus (CN). For each element the output consists of spontaneous rate (SR), weights A and B (positive for excitation, negative for inhibition) and C (positive for facilitation, negative for occlusion). The response of this model to the application of an acoustic stimulus consisting of a single tone plus an additive background noise to produce input stimuli is considered. It is shown that the magnitude of the 2nd harmonic in the response, according to the model, is proportional to the degree of facilitation or occlusion.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124066122","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}
引用次数: 0
Computer simulation of electrophoretic separation process 电泳分离过程的计算机模拟
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154593
S. Lee, G. Dulikravich, B. Kosović
{"title":"Computer simulation of electrophoretic separation process","authors":"S. Lee, G. Dulikravich, B. Kosović","doi":"10.1109/NEBC.1991.154593","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154593","url":null,"abstract":"A mathematical model for three-dimensional laminar steady flow of an incompressible viscous neutrally charged carrier fluid mixed with an electrically charged fluid is presented. All magnetic fields are neglected. Thermally induced buoyancy is incorporated via Boussinesq approximation while including Joule heating effects. Numerical results demonstrate the detrimental effects of numerical dissipation on the accuracy of the solution. Bending of a stream of charged particles under the influence of an electric field and an electrohydrodynamic instability are demonstrated.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"47 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128700194","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}
引用次数: 0
Design of a system for binaural hearing experimentation 双耳听力实验系统的设计
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154611
H. Ibrahim, S. Isabelle
{"title":"Design of a system for binaural hearing experimentation","authors":"H. Ibrahim, S. Isabelle","doi":"10.1109/NEBC.1991.154611","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154611","url":null,"abstract":"The development is described of a PC-based system for stimulus generation, recording, storing, and presentation for use in the execution of binaural hearing experiments. The system uses a multitasking polyFORTH language/operating system and incorporates a Texas Instruments TMS320C25 digital signal processor board in the IBM-PC/AT. The software design permits playing of arbitrary waveform length (currently limited by DOS memory), using a minimum amount of digital signal processing memory, and independence from a particular hardware configuration. The multitasking nature of polyFORTH allows for the easy connection of a second terminal to interact with the subject.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"181 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116906115","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}
引用次数: 0
Chaotic statistics of biomedical time series 生物医学时间序列的混沌统计
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154567
D. T. Kaplan
{"title":"Chaotic statistics of biomedical time series","authors":"D. T. Kaplan","doi":"10.1109/NEBC.1991.154567","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154567","url":null,"abstract":"New statistical techniques are reviewed that have been developed specifically for the analysis of chaotic systems. These techniques involve new concepts that are largely unrelated to those developed for the analysis of linear systems. Three such techniques are discussed: dimension, entropy, and Lyapunov exponents. All three techniques have a common starting point: embedding the time series. It is shown that artifacts of the chaotic statistical techniques-unimportant aspects of the time series (such as their finite length)-have unintended consequences in the statistical results. There are two widely (but not universally) applicable techniques that can help: randomized time series as controls, and coarsely approximate methods.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116094815","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}
引用次数: 2
A new method to represent and compute the 3-dimensional anatomy of fibrodendritic layers in the inferior colliculus 一种表示和计算下丘纤维树突层三维解剖结构的新方法
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154607
S. Ahghari, D. Oliver
{"title":"A new method to represent and compute the 3-dimensional anatomy of fibrodendritic layers in the inferior colliculus","authors":"S. Ahghari, D. Oliver","doi":"10.1109/NEBC.1991.154607","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154607","url":null,"abstract":"A method of graphically reconstructing and mathematically determining the three-dimensional orientation of the layered neurons in the inferior colliculus (IC) is introduced. A series of images is taken with a confocal microscope at discrete steps. These images are processed by an algorithm that emphasizes the closely spaced, layered dendrites within the central nucleus of the IC. The core of this approach lies in applying a combination of gradient (directional), median, and low-pass filters to extract contours of the lamina. The bit-mapped images are converted to vector lists, and the objects in a single layer are selected for linear regression analysis. A surface model that represents the layer is created by connecting the regression lines from each section. The spatial orientation of the surface is calculated as the vector cross product from each polygon in the surface. The average of all the normal vectors is taken to represent the orientation of the neural layer in 3-D space.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125060849","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}
引用次数: 0
Detection of EEG transients by changes in dimensional complexity 基于维复杂度变化的脑电瞬态检测
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154569
R. H. Simon, J. Arle
{"title":"Detection of EEG transients by changes in dimensional complexity","authors":"R. H. Simon, J. Arle","doi":"10.1109/NEBC.1991.154569","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154569","url":null,"abstract":"Summary form only given. A simple box accounting algorithm is applied to measure the fractal dimension of electroencephalography (EEG). Artificial transients of varying EEG characteristics are embedded. The change is noted in the fractal dimension within a window that is passed along the entire time series. Three embedded evoked potential spikes 100 ms apart buried anywhere in the time series are detected. Their presence is reflected in a significant change of a fractal dimension from 1.70 to 1.76. Both the power spectra and the autocorrelation functions of the same recordings were studied and no difference between the intervals that contain the transient and those which do not was observed.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"262 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121888740","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}
引用次数: 1
Effect of variance reduction techniques on Monte Carlo simulated energy spectra 方差约简技术对蒙特卡罗模拟能谱的影响
Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference Pub Date : 1991-04-04 DOI: 10.1109/NEBC.1991.154597
C. R. Harrell, I. Zubal
{"title":"Effect of variance reduction techniques on Monte Carlo simulated energy spectra","authors":"C. R. Harrell, I. Zubal","doi":"10.1109/NEBC.1991.154597","DOIUrl":"https://doi.org/10.1109/NEBC.1991.154597","url":null,"abstract":"Variance reduction techniques are applied to a Monte Carlo program in order to reduce the time required to compute a given number of gamma events in the detector. Energy spectra are generated and compared using brute force and two forced detection variance reduction techniques. The spectra demonstrate that the variance reduction does not significantly bias the character of the emerging gamma ray energy spectra. The mean error between the three simulated energy spectra is less than 5%. The agreement between the three spectra allows a level of confidence in the faster Monte Carlo variance reduction calculations that could not be achieved by merely comparing images calculated at the camera surface.<<ETX>>","PeriodicalId":434209,"journal":{"name":"Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference","volume":"1021 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1991-04-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121714942","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}
引用次数: 2
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