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Volume 2, Issue 2
Displaying 1-12 of 12 articles from this issue
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[in Japanese]1964 Volume 2 Issue 2 Pages 71-72
Published: April 01, 1964
Released on J-STAGE: March 09, 2011
JOURNAL FREE ACCESSDownload PDF (260K) -
Hiroshi KANAI1964 Volume 2 Issue 2 Pages 73-80
Published: April 01, 1964
Released on J-STAGE: March 09, 2011
JOURNAL FREE ACCESSElectromagnetic blood flowmeters are the most suitable for the continuous recording of the blood flow and the waveform measurement of the phasic blood flow.
Many reports on the electromagnetic blood flowmeter have been published, but many problems yet remain unsolved.
Important problems are as follows :
1) Drift of the zero line.
2) Effect of the conductivity of arterial walls.
3) Change of sensitivity according to liquid properties.
4) Accuracy of the measurement of phasic flow pattern.
5) Noise due to the leading electrode.
In this paper the cause of these problems chiefly about implantable electromagnetic blood flowmeters are described and the errors due to these ploblems are estimated.View full abstractDownload PDF (1275K) -
Kenkichi SUHARA, Masao SAITO, Kenji IKEDA1964 Volume 2 Issue 2 Pages 81-90
Published: April 01, 1964
Released on J-STAGE: March 09, 2011
JOURNAL FREE ACCESSThis paper reviews the present state of arts for analyzing brain waves mostly from engineering point of view. The standpoints in the analysis of brain waves are categorized into three possible ones; namely, (1) reducing enormaous quantity of EEG data in order to reveal the necessary informations, (2) recovering informations buried in EEG-waveforms which are not directly observable in their original forms, and (3) searching for the key to reveal some aspects of the mechanism of the brain functions.
The methods of analysis are also categorized into three groups; namely, (1) estimation of the probabilistic behavior of the generator of the brain waves, (2) estimation of the impulse response of the system, and (3) comparison of the behavior of the system with the assumed model.
Typical examples of the methods and instrumentations of the EEG analysis techniques are reviewed to some detail.View full abstractDownload PDF (2238K) -
Akira WATANABE1964 Volume 2 Issue 2 Pages 91-96
Published: April 01, 1964
Released on J-STAGE: March 09, 2011
JOURNAL FREE ACCESSFrom the standpoint of medical electronics, self-organizing systems have two important aspects. First, it is closely related to nervous system and such researches as the theory of thought processes and “perceptron” are based on the hypothetical anatomy and physiology of nervous system. Secondly, it is sometimes desirable to adopt the idea of self-organization in designing information processing machines suchas an ECG pattern recognizer and an automatic diagnosis machine, because, if they are self-organizing, they can develop themselves into the more efficient ones, the more data are collected. In the latter case, the actual functions of nervous system need not be exactly simulated, but it is better to choose the most suitable self-organizing method according to the structure of the machine. In this survey, however, emphasis is placed on the application of nervous self-organization. The Caianiello's theory of thought processes and one of its special applications, “perceptron” which is a model of visual perception and pattern recognition are explained in detail.View full abstractDownload PDF (1058K) -
Tadayuki MATSUO1964 Volume 2 Issue 2 Pages 97-104
Published: April 01, 1964
Released on J-STAGE: August 16, 2011
JOURNAL FREE ACCESSThe results of trials made of a fabricated A. C. type electromagnetic blood flowmeter are presented in this paper.
First the author investigated the problems of the electromagnetic flowmeter arising from the principle, electrodes and electronic circuits.
Secondly, based on these considerations, a highly sensitive blood flowmeter using 1000 c/s sinusoidal magnetic field was made. It was mainly aimed at applying externally for human bodies. In particular, much attention has been paid in its design in order to enable to measure low velocity blood flows during heart operation by using an artificial heart.
Expeimental results showed that it was very easy to measure such an extremely low average flows as (2-3) ×10 cc/min employing a tube of 3 mm in inner diameter.View full abstractDownload PDF (1157K) -
Tsuneo TOMITA, Akimichi KANEKO1964 Volume 2 Issue 2 Pages 105-110
Published: April 01, 1964
Released on J-STAGE: March 09, 2011
JOURNAL FREE ACCESSIn the study of electrical properties of the cell membrane, several kinds of microelectrode arrangements have been used to observe the effect of extrinsic current on the membrane potential. When the cell under study was invisible, however, the only choice was to use either a single pipet for both current and recording, or a double-barrelled microelectrode : one barrel for current, and the other for recording. A problem in either common or separate case is the difficulty of eliminating the effect of resistive coupling between the current and recording systems.
The pencil-type coaxial microelectrode, which was primarily designed for simultaneous intra- and extracellular recording, was remodelled to overcome this difficulty by making its outer pipet small enough (0. 5μ at the tip) to penetrate into a single cell together with the inner pipet which was made less than 0. 1μ at the tip. The resistive coupling was negligible when the inner pipet protruded by a few microns out of the tip of the outer pipet. Because of the fineness of the electrode, it proves difficult to adjust the tip distance between both pipets visually under a microscope, but this could be done electrically. An example of application of this type of microelectrode to the fish retina is described.View full abstractDownload PDF (1202K) -
Kensuke SATO1964 Volume 2 Issue 2 Pages 111-120
Published: April 01, 1964
Released on J-STAGE: March 09, 2011
JOURNAL FREE ACCESSIt was verified that some fundamental concepts in neurophysiology are equivalent and/or analogous to those in the theory of servomechanism. Starting from these common base, linear and nonlinear stochastic processes to describe the masspotential activity in the brain neighbouring to the leading electrodes were obtained. They are also equivalent to those for describing the behaviour of servosystems. Here, the response of masspotential system in the brain elicited by such unit impulses as a single one, double one, triple one and so on are essentially important, because they repressent the brain “activity”, which is an extention of the “excitability” in physiology and analogous to the “proportional gain” of a servosystem.View full abstractDownload PDF (1405K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1964 Volume 2 Issue 2 Pages 121-123
Published: April 01, 1964
Released on J-STAGE: March 09, 2011
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[in Japanese]1964 Volume 2 Issue 2 Pages 124-127
Published: April 01, 1964
Released on J-STAGE: March 09, 2011
JOURNAL FREE ACCESSDownload PDF (915K) -
[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...1964 Volume 2 Issue 2 Pages 128-130
Published: April 01, 1964
Released on J-STAGE: March 09, 2011
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1964 Volume 2 Issue 2 Pages 131-134
Published: April 01, 1964
Released on J-STAGE: March 09, 2011
JOURNAL FREE ACCESSDownload PDF (853K) -
1964 Volume 2 Issue 2 Pages 146-148
Published: April 01, 1964
Released on J-STAGE: March 09, 2011
JOURNAL FREE ACCESSDownload PDF (538K)
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