Japanese journal of medical electronics and biological engineering
Online ISSN : 2185-5498
Print ISSN : 0021-3292
ISSN-L : 0021-3292
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Volume 9, Issue 6
Displaying 1-10 of 10 articles from this issue
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  • Image Processing
    Mikio TAKAGI
    1971 Volume 9 Issue 6 Pages 389-396
    Published: December 30, 1971
    Released on J-STAGE: March 09, 2011
    DOIhttps://doi.org/10.11239/jsmbe1963.9.389
    JOURNAL FREE ACCESS
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  • Automatic Control of Respiration by an Optimally Controlled Respirator
    Yoshinori MITAMURA, Tomohisa MIKAMI, Hiromi SUGAWARA, Chiyoshi YOSHIMO ...
    1971 Volume 9 Issue 6 Pages 397-405
    Published: December 30, 1971
    Released on J-STAGE: March 09, 2011
    DOIhttps://doi.org/10.11239/jsmbe1963.9.397
    JOURNAL FREE ACCESS
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    An optimally controlled respirator was developed so as to maintain arterial PCO2 constant. It has three main features : 1) ventilation is controlled by the patient's metabolic rate from continuously measured CO2 output, 2) physiologic dead space approximated as a linear function of tidal volume is used to estimate alveolar ventilation, and 3) respiratory rate is computed to minimize ventilatory work.
    The control system of the respirator was designed, subject to the analytical results of the ventilatory response of the man-respirator system obtained with a digital computer.
    Anesthetized dogs were ventilated by the respirator for periods exceeding 24 hours. Arterial PCO2 and PO2, were maintained within permissible ranges.
    The respirator was applied to dogs when the metabolic rate was changed by intravenous CO2 loading. Arterial PCO2 returned to the original level within 10 minutes after the CO2 loading began. Following initial CO2 loading, the arterial PCO2 was observed to exceed the normal range for about three minutes. After the CO2 loading stopped, arterial PCO2 decreased slightly and then increased to the same level as before CO2 loading.
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  • Some Properties of the Density Modulated Poisson Pulse Trains
    Yasuyuki ISO, Torao YANARU, Yasuo NAKAYAMA
    1971 Volume 9 Issue 6 Pages 406-412
    Published: December 30, 1971
    Released on J-STAGE: March 09, 2011
    DOIhttps://doi.org/10.11239/jsmbe1963.9.406
    JOURNAL FREE ACCESS
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    Mathematical expressions are derived for the probability density functions (pdf's) of the pulse intervals of the Poisson pulse trains which are density modulated by two kinds, of modulating signals, i. e., periodic signals and random telegraph signals. The pdf's are calculated and illustrated in both cases for several parameter values of the modulating signals.
    In the case of a periodic modulating signal, the pdf is represented as the product of a periodic function and an exponential function, while, when the modulating signal is a random telegraph signal, the pdf is represented as the sum of two exponential functions.
    Poisson pulse trains which are density modulated by a kind of continuous random signal with the known property are generated by the computer simulation method. The pulse interval histograms, the serial correlation coefficients (scc's) of pulse counts, and the scc's of pulse intervals are calculated and illustrated for several sets of parameter values of modulation signals.
    One of the scc's of pulse counts is compared with the autocorrelation function of the corresponding modulating signal, and it is shown that the former can be used as the estimate of the latter.
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  • Characteristics of the Air Cavities of Phonocardiographic Microphone and Effects of Vibration and Room Noise
    Nobuo SUZUMURA, Kazuo IKEGAYA
    1971 Volume 9 Issue 6 Pages 413-419
    Published: December 30, 1971
    Released on J-STAGE: March 09, 2011
    DOIhttps://doi.org/10.11239/jsmbe1963.9.413
    JOURNAL FREE ACCESS
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    Several problems on the phonocardiographic microphones are investigated. A tentatively made condenser microphone used for phonocardiography is discussed briefly at first. Then, the characteristics of several types of air cavity of phonocardiographic microphone are discussed rather in detail by calculating their acoustic fields and measuring them with a probe tube microphone. Two sorts of microphones, condenser and moving coil, are considered in these calculations.
    Next, the vibration sensitivity of the phonocardiographic microphone is discussed. Its measured values are compared with theoretical ones. A few dBs of differences appear in some frequencies, but the tendencies of two curves are in good agreement. The sensitivity of the microphone to the room noise is investigated finally. The ways how the room noise reaches the microphone are also discussed.
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  • [title in Japanese]
    [in Japanese]
    1971 Volume 9 Issue 6 Pages 420-425
    Published: December 30, 1971
    Released on J-STAGE: March 09, 2011
    DOIhttps://doi.org/10.11239/jsmbe1963.9.420
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese], [in Japanese]
    1971 Volume 9 Issue 6 Pages 426-431
    Published: December 30, 1971
    Released on J-STAGE: March 09, 2011
    DOIhttps://doi.org/10.11239/jsmbe1963.9.426
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1971 Volume 9 Issue 6 Pages 432-433
    Published: December 30, 1971
    Released on J-STAGE: March 09, 2011
    DOIhttps://doi.org/10.11239/jsmbe1963.9.432
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    [in Japanese]
    1971 Volume 9 Issue 6 Pages 434-435
    Published: December 30, 1971
    Released on J-STAGE: March 09, 2011
    DOIhttps://doi.org/10.11239/jsmbe1963.9.434
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1971 Volume 9 Issue 6 Pages 436-439
    Published: December 30, 1971
    Released on J-STAGE: March 09, 2011
    DOIhttps://doi.org/10.11239/jsmbe1963.9.436
    JOURNAL FREE ACCESS
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  • [title in Japanese]
    1971 Volume 9 Issue 6 Pages 441-442
    Published: December 30, 1971
    Released on J-STAGE: March 09, 2011
    DOIhttps://doi.org/10.11239/jsmbe1963.9.441
    JOURNAL FREE ACCESS
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