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Biomedical Engineering, IEEE Transactions on

Issue 6 • Date Nov. 1971

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Displaying Results 1 - 19 of 19
  • Table of contents

    Page(s): c1
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  • IEEE Engineering in Medicine and Biology Group

    Page(s): c2
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  • A New Approach to Prosthetic Control: EEG Motor Signal Tracking With an Adaptively Designed Phase-Locked Loop

    Page(s): 389 - 398
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    The feasibility of using brain waves to control an externally powered prosthetic device for amputees was investigated. Two subjects were studied; one normal and one with a right hand disarticulation. Each subject, otherwise at rest, performed the protocol of voluntarily, repetitively opening and closing his hand. The normal accomplished this, while the amputee attempted to use her missing limb as if it were present. The time between opening and the next closing, and between closing and the next opening, was approximately 2 s. Simultaneously with this procedure, electroencephglograms (EEGs) were recorded from scalp electrodes presumably overlying the motor cortex on the left side, and an electromyogram (EMG) was taken from right forearm surface electrodes. The EEG and EMG were recorded on a polygraph and on magnetic tape. The latter recording was later sampled at 128 samples/s and quantized to 210 levels. View full abstract»

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  • The Analysis of Respiratory Sinus Arrhythmia Using Spectral Analysis and Digital Filtering

    Page(s): 399 - 409
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    Respiratory sinus arrhythmia is the phenomenon by which respiration modulates heart rate in normal humans and in many animals. This investigation was divided into the following three categories: 1) the development of a mathematical model relating respiration to those variations that it causes in heart rate; 2) the use of digital filtering techniques to attenuate fluctuations in heart rate which are due to respiration; and 3) the development of methods that use only heart rate to get information about respiration. View full abstract»

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  • Transthoracic Ventricular Defibrillation in the Dog with Truncated and Untruncated Exponential Stimuli

    Page(s): 410 - 415
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    From 10 560 transthoracic fibrillation-defibrillation episodes in large anesthetized dogs, the effectiveness of 88 types of untruncated and truncated exponential waveforms in reversing ventricular fibrillation was evaluated. The study involved waveforms which could be generated with stored energy levels (in the simple capacitor-switch sense) of 60, 90, 120, and 180 J and initial current levels of 10, 20, 30, 40, 60, 80, and 100 A. The 10-A waveforms were untruncated or truncated at final current values of 5, 7.5, and 9 A. The 20-, 30-, and 40-A waveforms were untruncated or truncated at 5, 10, and 15 A. The 60-, 80-, and l00-A waveforms were untruncated or truncated at the 15-A level. View full abstract»

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  • Laser Doppler Measurements of Localized Pulsatile Fluid Velocity

    Page(s): 416 - 420
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    An optical Doppler velocimeter utilizing optical heterodyning techniques was used to measure radial velocity profiles of pulsatile flow in a cardiovascular circulation model. The light source was a single-mode frequency-stabilized He-Ne CW laser (6328 Å, 0.1 mW). The laser beam was focused to a 30-¿m in diameter spot in the flow stream. Polystyrene spheres 0.73 ¿m in diameter, suspended in distilled water, were used as light scatterers. The optical signal beam contained Doppler-shifted scattered light. The reference beam was split from the source beam in one configuration; in a second configuration an acoustical frequency modulator was installed in the reference beam pathway as part of a directional flow measurement system. The circulation model consisted of an artificial heart, a Windkessel model, a peripheral resistance, a capillary model, a reservoir, and an optical glass window section. The flow test section was positioned by a three-dimensional finely adjustable holder. From 10 to 34 point measurements were obtained to plot one velocity profile, which covered 95 percent of the tube diameter. View full abstract»

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  • An Electromagnetic System for Studying the Responses of Aquatic Organisms to Weak Electric and Magnetic Fields

    Page(s): 421 - 424
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    Recent evidence suggests use of electric and magnetic cues as orientational aids to long-distance migration by fishes. A simple laboratory apparatus is described which accurately reproduces the electromagnetic fields an aquatic organism might naturally experience. View full abstract»

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  • Phase Lock for Correlation Detection of a Periodic Pulse

    Page(s): 424 - 426
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    The detection of the presence of a periodic pulse with uncertain pulse rate and low duty cycle is a common biotelemetry problem. Modern phase-lock and correlation techniques have provided more efficient means of making the presence decision than that provided by energy detection methods. A local signal is cross correlated with the input in a phase-locked loop (PLL) to provide phase reference. Upon lock, a local duplicate signal is generated and correlated with the input. A decision threshold operates on the correlator output. The PLL with filter F(s) = (s+a)/s and three appropriate nonlinearities are analyzed for acquisition time and maximum frequency error that will lock. View full abstract»

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  • An Automatic Curve Follower for Use with Physiological Recorders

    Page(s): 426 - 428
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    The addition of an optional feedback loop to a previously described automatic analog curve reader, which was originally designed for reconversion of EEG ink recordings to electrical form, permits operation of the curve reader as a true line follower, often a more appropriate method for reconversion of polygraphic ink recordings having gradual to moderate slopes. View full abstract»

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  • Patient Electrode Isolation Adapter

    Page(s): 428 - 430
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    Safety has rapidly become a major issue in the hospital environment. Electronic equipment, particularly monitoring apparatus, has modernized clinical procedures, but constitutes a potential danger to patients. A simple isolation adapter is described which can eliminate the shock hazards of existing equipment by breaking the electrical connection between electrode and monitor. Integral current-limiting circuitry protects against component failure within the coupler. View full abstract»

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  • A Novel High-Performance Preamplifier for Biological Applications

    Page(s): 430
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    A high-performance differential preamplifier is described which combines high input impedance, controlled gain, low input noise, and high common-mode rejection. View full abstract»

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  • Improved Buffer Amplifier for Incorporation Within a Biopotential Electrode

    Page(s): 430 - 431
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    An amplifier for an active electrode is described which requires only a two-conductor connecting cable, is current limiting for patient safety, and has essentially unity voltage gain. In addition, the output impedance is lower and the input impedance has more adjustment latitude than is possible with a conventional source follower. View full abstract»

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  • Letters to the Editor

    Page(s): 432
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  • Abstracts of dissertations

    Page(s): 433 - 440
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  • Keyword Abstracts

    Page(s): 441 - 442
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  • Author index

    Page(s): 442a - 442c
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  • Index Subject

    Page(s): 442c - 442f
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  • IEEE Transactions on Bio-Medical Engineering Statement of Editorial Policy

    Page(s): 442-g
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  • Institutional listings

    Page(s): 442h
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Aims & Scope

IEEE Transactions on Biomedical Engineering contains basic and applied papers dealing with biomedical engineering. Papers range from engineering development in methods and techniques with biomedical applications to experimental and clinical investigations with engineering contributions.

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Meet Our Editors

Editor-in-Chief
Bin He
Department of Biomedical Engineering