著者

大河原 章

出版者

一般社団法人 日本生体医工学会

雑誌

医用電子と生体工学 (ISSN:00213292)

巻号頁・発行日

vol.21, no.1, pp.2-8, 1983-02-28 (Released:2011-10-14)

参考文献数

3

被引用文献数

1

著者

上野 照剛

出版者

一般社団法人 日本生体医工学会

雑誌

BME (ISSN:09137556)

巻号頁・発行日

vol.2, no.10, pp.643-650, 1988

被引用文献数

2

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MRI, SQUIDによる生体磁気計測および磁気の生体作用に関する研究領域はバイオマグネティックスと呼ばれ, この新しい境界領域の進展には各方面からの関心が寄せられている. ここでは, バイオマグネティックスの最近の動向を概観し, 今後の展望を述べる.

著者

松永 是

出版者

一般社団法人 日本生体医工学会

雑誌

BME (ISSN:09137556)

巻号頁・発行日

vol.3, no.11, pp.40-46, 1989-11-10 (Released:2011-09-21)

参考文献数

7

出版者

一般社団法人 日本生体医工学会

雑誌

医用電子と生体工学 (ISSN:00213292)

巻号頁・発行日

vol.30, no.Supplement, pp.157-163, 1992-05-01 (Released:2011-10-14)

著者

南谷 晴之 萩田 紀博

出版者

一般社団法人 日本生体医工学会

雑誌

医用電子と生体工学 (ISSN:00213292)

巻号頁・発行日

vol.18, no.4, pp.256-263, 1980-08-30 (Released:2011-03-09)

参考文献数

31

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In this study, a neural network model is proposed to obtain -the numerical description of pain mechanisms. The model simulates peripheral receptors, afferent L- and S-fibers and the receptive cells of the spinal cord area Adaptation effect and conduction velocity of each fiber are considered in the model. The activities of peripheral and spinal cord neural cells are represented by the Wilson-Cowan's differential equation, considering the ongoing activity of neurons. Pain and touch sensibilities are estimated by the firing activities of lamina V (Transmission, T) cells and lamina IV cells, respectively.The results of model simulation have been obtained for single square-wave pulse and periodic pulse sequences applied on peripheral receptors. The duration of initial bursts of T and IV cells, which occur soon after the beginning of stimulation, depends on the stimulus intensity and approaches a plateau with increasing intensity. In case the stimulus intensity is increased above the threshold of S-fibers, secondary burst of T cells appears about 50 msec after the stimulation, which is equivalent to the conduction time of S-fibers from the periphery towards the spinal cord cells. High-frequency and high-intensity stimulation gives the typical firing patterns of pain modality, represented by the high secondary burst of T cells which continues during the stimulation. From the results of periodic pulse stimulation, the so-called pain and absolute threshold characteristics have been obtained and have been compared with the results of cutaneous electrical stimulation. Both results are shown by quite a similar relationship between stimulus pulse frequency and stimulus intensity and their characteristics are given by the power function's law of frequency and intensity.The proposed neural network model mimics the pain modality very well, and the results of simulation are in good agreement with some of physiological and experimental results.

著者

山越 憲一 戸川 達男 神谷 瞭 藤井 禎三 土屋 喜一

出版者

一般社団法人 日本生体医工学会

雑誌

医用電子と生体工学 (ISSN:00213292)

巻号頁・発行日

vol.14, no.4, pp.296-302, 1976-08-30 (Released:2011-03-09)

参考文献数

9

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From the point of the optimal theory, the relationship between the branching structure and the mechanical characteristics of a tree was analysed in reference with such parameters as circum-ference, weight, bending moment, branch length and-branching angle, The study was based on a hypothesis that the optimal structure of a tree agrees the minimum energy loss.The total energy loss is the sum of the energy required for the construction which is proportional to the wood' volume of the branches and the energy consumption for supporting the weight of the branches and leaves which is equal to the elastic. strain energy. Results derived theoretically from the hypothesis are as follows : 1) The Maximum bending stress at each branching point is constant.2) The relation between the circurmference (C) at some point and the bending moment (T) acting on the branch is, T∝C3. 3) The relation between the weight (W) of all the parts of the tree peripheral to some branching point and C is, W∝C2.5. 4) The relation between T and W is, W∝T5/6. 5) The relatlon between the branch length (l) and C is, l2 ∝C. 6) When C0, C1, C2 are the circumferences of the mother and daughter branches and θ1, θ2 are their branching angles, the following optimal conditions for a dichotomy are derived;C02.5= C12.5+C22.5 and C13/ sinθ2=C23/ sinθ1.These relations were examined, by measuring the varying size of branches, 76-286 in all, on seven different kinds of trees, and the very good agreements between the theoreiical and actual relations were confirmed.

著者

勝部 幸輝

出版者

一般社団法人 日本生体医工学会

雑誌

BME (ISSN:09137556)

巻号頁・発行日

vol.5, no.2, pp.36-44, 1991-02-10 (Released:2011-09-21)

参考文献数

23

出版者

一般社団法人 日本生体医工学会

雑誌

医用電子と生体工学 (ISSN:00213292)

巻号頁・発行日

vol.38, no.Supplement, pp.236-240, 2000-05-17 (Released:2011-10-14)

著者

戸川 達男

出版者

一般社団法人 日本生体医工学会

雑誌

BME (ISSN:09137556)

巻号頁・発行日

vol.2, no.3, pp.156-160, 1988-03-10 (Released:2011-09-21)

参考文献数

15

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臨床検温は水銀体温計によって確立され今日に至っているが, 電子体温計をはじめ, いろいろな体温計測機器が臨床に導入されるようになり, 検温の方法が変わりつつある. しかし, 多くの体温計測機器は完成度が低く, 問題が多い. 検温法の見直しとともに, 完成度の高い機器の開発が望まれる.

著者

福島 邦彦

出版者

一般社団法人 日本生体医工学会

雑誌

医用電子と生体工学 (ISSN:00213292)

巻号頁・発行日

vol.19, no.5, pp.319-330, 1981-09-30 (Released:2011-07-05)

参考文献数

59

著者

山家 智之 仁田 新一 吉澤 誠

出版者

一般社団法人 日本生体医工学会

雑誌

BME (ISSN:09137556)

巻号頁・発行日

vol.10, no.4, pp.43-52, 1996-04-10 (Released:2011-09-21)

参考文献数

38

著者

北城 圭一 山本 義春 宮下 充正

出版者

一般社団法人 日本生体医工学会

雑誌

BME (ISSN:09137556)

巻号頁・発行日

vol.12, no.7, pp.40-48, 1998-07-10 (Released:2011-09-21)

参考文献数

36

被引用文献数

1

著者

安藤 譲二 是永 理佐 山本 希美子 神谷 瞭

出版者

一般社団法人 日本生体医工学会

雑誌

BME (ISSN:09137556)

巻号頁・発行日

vol.14, no.8, pp.11-16, 2000-08-10 (Released:2011-12-05)

参考文献数

32

出版者

一般社団法人 日本生体医工学会

雑誌

医用電子と生体工学 (ISSN:00213292)

巻号頁・発行日

vol.34, no.Supplement, pp.396-402, 1996-05-16 (Released:2011-10-14)

著者

榊原 洋一

出版者

一般社団法人 日本生体医工学会

雑誌

BME (ISSN:09137556)

巻号頁・発行日

vol.12, no.7, pp.3-11, 1998-07-10 (Released:2011-09-21)

参考文献数

19

著者

安井 稔

出版者

一般社団法人 日本生体医工学会

雑誌

BME (ISSN:09137556)

巻号頁・発行日

vol.1, no.10, pp.784-789, 1987-10-10 (Released:2011-09-21)

参考文献数

5

著者

酒本 勝之 金子 和真 江崎 光裕 藤井 麻美子 金井 寛 浅野 次義

出版者

一般社団法人 日本生体医工学会

雑誌

医用電子と生体工学 (ISSN:00213292)

巻号頁・発行日

vol.33, no.3, pp.184-191, 1995 (Released:2011-10-14)

参考文献数

14

被引用文献数

2

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A new method (BIM) by bioelectrical impedance for the estimation of human whole body or local part fat volume is described. This method is based upon that the resistivity of adipose tissue is much greater than that of fat-free mass of which frequency characteristics shows β dispersion phenomenon. It is well known that the admittance locus of fat-free mass provides the semicircle. Because the impedance value of trunk is only 10 or 20% of the whole body impedance (Zall) between arm and leg used by the commercialized impedance fat meter, if the fat volume in the trunk increase, the estimation error in the fat volume estimated from Zall would increase. Therefore, instead of Zall, BIM adopts the impedances measured at 5 local parts which are antebrachium, brachium, trunk, femoral part and cruralis. We measured the impedance of each parts for the frequency range from 3kHz to 300kHz and calculate the admittance locus in order to obtain the conductance at much lower frequency (Ge) and much higher frequency (Ginf) than β dispersion frequency. Arms, trunk and legs are represented by parallel models which are cone shape and consists of fat layer and fat-free mass layer. And then we calculate the equivalent conductivity σ of parallel models from Ge or Ginf. From σ, fat volumes of local parts which are arm, trunk and leg and whole body are estimated. When we estimate the fat volume of trunk, in order to take into consideration the adipose tissue which distributes around organs in trunk like liver, stomach, and etc., the weighting function K which is statistically given is multiplied to the equivalent conductivity of trunk. The reference fat volume can be measured by hydrometry. We can conclude that (1) the impedance at the trunk must be measured to consider the fat volume in the trunk, (2) Ge or Ginf must be used instead of impedance at about 50kHz to estimate the fat volume, and (3) correlation coefficients between the whole fat volume measured by hydrometry and that by BIM with Ge and Ginf are about 0.77 and 0.94, respectively.

著者

岩田 欧介 田村 正徳 杉浦 正俊 中村 友彦

出版者

一般社団法人 日本生体医工学会

雑誌

BME (ISSN:09137556)

巻号頁・発行日

vol.12, no.7, pp.69-78, 1998-07-10 (Released:2011-09-21)

参考文献数

47

著者

滝沢 耕一

出版者

一般社団法人 日本生体医工学会

雑誌

BME (ISSN:09137556)

巻号頁・発行日

vol.1, no.11, pp.836-839, 1987-11-10 (Released:2011-09-21)

参考文献数

8

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酵素電極法は, 臨床化学検査の高速化, 微量化のためには有効な手段であり, とくに, ベッドサイド型の検査装置に組み込まれて, 酵素電極の特性が生かされている. 最近の動向として, FETを用いた酵素FETセンサが開発され, 用途の拡大が期待されている.

著者

小枝 達也

出版者

一般社団法人 日本生体医工学会

雑誌

BME (ISSN:09137556)

巻号頁・発行日

vol.12, no.7, pp.89-94, 1998-07-10 (Released:2011-09-21)

参考文献数

15