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Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference

4-5 April 1991

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Displaying Results 1 - 25 of 112
  • Establishing constitutive relationships for soft biological tissues

    Publication Year: 1991
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (58 KB)

    Summary form only given. An algorithm is presented by which stress-strain relationships, or constitutive equations, for various soft tissues may be developed, and some of the pitfalls affecting the process are discussed. These concepts are illustrated using the lung as an example. Four elements are required for analysis of the deformation of a body: (1) the geometry of the body in question, (2) a ... View full abstract»

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  • Detection of EEG transients by changes in dimensional complexity

    Publication Year: 1991
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (31 KB)

    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 ... View full abstract»

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  • Evaluating the validity of the Oxylog in adults at rest and during exercise

    Publication Year: 1991, Page(s):147 - 148
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (163 KB)

    The reliability of a portable oxygen consumption meter (Oxylog) before its clinical utilization is determined by comparing simultaneously collected data from an Oxylog and a Medical Graphics 2001 metabolic cart during rest and bicycle ergometer exercise in normal adults. The results indicate differences in oxygen consumption and inspiratory ventilation values between the two systems. It is propose... View full abstract»

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  • Proceedings of the 1991 IEEE Seventeenth Annual Northeast Bioengineering Conference (Cat. No.91CH2997-5)

    Publication Year: 1991
    Request permission for commercial reuse | PDF file iconPDF (12 KB)
    Freely Available from IEEE
  • Mechanism of the voltage-induced conductance change in the Na channel

    Publication Year: 1991, Page(s):169 - 174
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    A mechanism proposed for the voltage-dependent sodium channel postulates solid-state Na+ conduction through the polypeptide structure. Ion conduction is assumed to be state solid-state, through the protein subunits of the channel, rather than aqueous, through a hypothetical pore. The channel conformational change is taken to be a phase transition, with the closed state ferroelectric and... View full abstract»

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  • Simulations of cell-target encounter incorporating chemotaxis effects: single and multiple cell-target simulations in two dimensions

    Publication Year: 1991, Page(s):167 - 168
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (96 KB)

    Computer simulations of particle-target encounter in which there is a biased motion of the particles toward their targets are applied to the immune system. The authors' earlier continuum models for encounter rates and dynamics have shown that a small degree of directedness in the cell's motion can provide a substantial decrease in the encounter time. Encounter can be considered the rate-limiting s... View full abstract»

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  • Harmonic analysis of binaural interaction potentials

    Publication Year: 1991, Page(s):11 - 12
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    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... View full abstract»

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  • Scanning acoustic microscopy and human femoral bone remodelling

    Publication Year: 1991, Page(s):165 - 166
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    An experiment was conducted to evaluate and analyze the acoustic properties of the cortical, diaphyseal bone of the human femur. The analysis not only included a regional analysis, but also an analysis of the three circumferential zones of the bone, the periosteal, middle, and endosteal zones. Differences between individual pairs as well as the transition of properties between the periosteal and e... View full abstract»

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  • A Hall-effect magnetic field detector

    Publication Year: 1991, Page(s):255 - 256
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    An accurate low-cost field detector was designed to measure the magnitude of magnetic flux density generated by 60 Hz AC. The Hall effect magnetic field detector was designed as an exposure assessment instrument that can provide the information needed to accurately conduct these epidemiologic studies. Though fields generated by high voltage transmission lines seem to be the focus of much public co... View full abstract»

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  • Use of a discrete electro-oculographic control system with and without oscillatory motion of the head

    Publication Year: 1991, Page(s):129 - 130
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (148 KB)

    The effectiveness of the discrete electrooculographic control system (DECS) and various methods of its use are studied. This device utilizes the dipole present in the eye to emulate a standard computer input device. Initial tests of the DECS system parameters show that this device may be useful as an input device for persons with some degree of uncontrollable vibration when resting or moving. Thou... View full abstract»

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  • Unsupervised learning in constrained linear networks

    Publication Year: 1991, Page(s):9 - 10
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    Constrained linear architectures which learn in unsupervised mode according to Hebb's rule to minimize the output energy are analyzed. Under which conditions such networks act as decorrelating (square-root) filters is investigated. An algorithm is proposed which is almost optimum since the inputs of each filter (which are also the outputs of the net) become more and more decorrelated as the algori... View full abstract»

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  • Preliminary investigations with a new indentation type tonometer

    Publication Year: 1991, Page(s):247 - 248
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (116 KB)

    A new type of tonometer is being developed and tested at the University of New Hampshire (UNH) that will allow not only ocular tonometric recordings but a vast variety of tonometric measurements. The UNH tonometer (UNHT) set in the ocular mode to measure intraocular pressure (IOP) in humans was tested against a Goldmann applanation tonometer. Eyes were simulated with balloons filled with saline an... View full abstract»

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  • A comparative study of rowing biomechanics

    Publication Year: 1991, Page(s):271 - 272
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    The author describes an instrumentation package that has been developed to collect data for the study of rowing biomechanics. Currently, this system is interfaced with a Concept II rowing ergometer. The system acquires and analyzes handle and footstretcher kinetics as well as handle, limb segment and seat kinetics. Given these measurements, a biomechanical model of ergometer rowing can be develope... View full abstract»

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  • Modeling neurite outgrowth on laminin in vitro

    Publication Year: 1991, Page(s):163 - 164
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    Experimental parameters were measured and incorporated into a mathematical model to describe axonal outgrowth on the extracellular matrix molecule, laminin, in vitro. To elucidate the role of laminin and other basement membrane components in axonal growth and guidance, a systematic analysis of the effects of these various molecules on outgrowth characteristics such as the rate and direction of gro... View full abstract»

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  • Auditory image processing in a virtual acoustic environment

    Publication Year: 1991, Page(s):119 - 120
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB)

    A system is described that simulates free-field source at different locations through headphones, and experiments that make use of that system are discussed. The system makes use of commercially available components and incorporates automatic compensation for head motion. It also allows an interactive mode in which the subject modifies the simulated acoustic environment by changing her/his hand po... View full abstract»

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  • Two and three-dimensional motion models for the left-ventricular wall

    Publication Year: 1991, Page(s):193 - 194
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    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... View full abstract»

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  • An artificial neural network for studying binaural sound localization

    Publication Year: 1991, Page(s):1 - 2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    A three-layer neural network is used to solve the problem of extracting relative azimuth and elevation positional information from signals detected by two directional receivers that are spatially separate. This is analogous to the ability of owls to localize the position of sound sources based solely on the properties of the signals reaching the two ears. Although the network implemented does not ... View full abstract»

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  • Phase plane analysis of post extra-systolic potentiation

    Publication Year: 1991, Page(s):181 - 182
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    Improved cardiac function after a spontaneous extrasystole in an anesthetized mongrel dog preparation was analyzed based on left ventricular pressure measurement only. Experiments were performed on open-chest anesthetized dogs. Left ventricular pressure (LVP) was measured with a Millar type catheter-tip pressure transducer inserted through an isolated femoral artery and advanced to the left ventri... View full abstract»

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  • An investigative study of membrane-based biosensors

    Publication Year: 1991, Page(s):253 - 254
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    A system for incorporating naturally occurring membrane-based biological recognition elements into surface structures has been investigated. Alkylsilane molecules were covalently bound to the surface of a silicon/silicon dioxide (Si/SiO2) electrode as one half of a bilayer membrane mimetic structure. Detergent dialysis was then used to reconstitute lipids and proteins into the other hal... View full abstract»

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  • Estimating human hearing thresholds using potentials that follow sinusoidally amplitude modulated (SAM) tones

    Publication Year: 1991, Page(s):125 - 126
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    Binaural sinusoidally amplitude modulated (SAM) tones were used to evoke potentials from the scalp that followed the modulation envelope. It is examined whether this amplitude-modulation following response (AMFR), with modulation frequencies near 40 Hz, can be used to estimate frequency-specific hearing thresholds by two methods: (1) decreasing sound intensity until the AMFR could no longer be evo... View full abstract»

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  • Neural network classification of EEG data generated through use of the audio oddball paradigm

    Publication Year: 1991, Page(s):7 - 8
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    Single trial electrical brain evoked potentials were recorded using two different audio stimuli with unequal probabilities of occurrence. A modified self-organizing Kohonen neural network was used to organize the responses. The output of the network formed a topological map of the various component responses which included both changes in the evoked potential waveforms and the performance reaction... View full abstract»

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  • Noninvasive sensor arrays: separate evaluation of inputs for adaptive noise reduction

    Publication Year: 1991, Page(s):243 - 244
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    An algorithm is described which optimally reduces additive noise from a biological signal, given one primary input and multiple reference inputs, by the method of least squares. The algorithm separately compares two parallel cost functions for each reference input, in gain space, as a means of updating the global weight vector. At the global minimum of the cost function, optimal noise reduction is... View full abstract»

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  • Extracting knowledge from case databases

    Publication Year: 1991, Page(s):267 - 268
    Cited by:  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    The FGP machine is a software architecture that uses similarity-based reminding to make the domain knowledge contained in the data explicit, and then brings that knowledge to bear on information retrieval and machine learning tasks. The FGP machine's goal is to use the cases themselves to drive the system. The system should reason on the basis of specific cases and groups of cases, and should ther... View full abstract»

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  • Chaotic statistics of biomedical time series

    Publication Year: 1991, Page(s):33 - 34
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    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 ... View full abstract»

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  • An alternative mobility aid for the blind: the `ultrasonic cane'

    Publication Year: 1991, Page(s):158 - 159
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    A design of a small portable electronic cane utilizing Polaroid's Ultrasonic Ranging Unit intended to supplement or replace the traditional long cane is presented. A prototype was fitted in a flashlight-like enclosure made of a PVC tube with an external battery pack as power supply and an ear-plug, for the audible output. Preliminary testing of the prototype with two blind individuals shows that s... View full abstract»

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