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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Biomedical Engineering Research
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Journal DOI :
The Korea Society of Medical and Biological Engineering
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Volume & Issues
Volume 2, Issue 2 - Dec 1981
Volume 2, Issue 1 - Jun 1981
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A Study on the Origin of Spontaneous Firing
Journal of Biomedical Engineering Research, volume 2, issue 1, 1981, Pages 3~14
A theoretical investigation of the origin of the spontaneous firing in the squid axon was done with a mathmatical computer modelling based on the Hodgkin-Huxley equation. It is strongly believed that the existence of calcium ions in the membrane is essential to cause firing. The results of the computer simulation of the modelling indicate that the sites of calcium ions in the membrane might be near the potassium channel and the leakage channel plays an important role in the firing. The orientation of the future research project was suggested. And also, a theoretical investigation of the origin of the firing in the propagating action potential was done in the same way.
A Theoretical Study of Ultrasound Scattering by Blood
Journal of Biomedical Engineering Research, volume 2, issue 1, 1981, Pages 15~20
In this study, the scattering of ultrasound by blood is theoretically studied. At first, the Chernow equation which represents acoustic propagation inside the region of inhomogenieties is modified to be fitted for blood. Then, scattering amplitude and scattering Cross-section at the far-field region are obtained from this equation. In this case, hemotocrit is assumed to be less than 26 per cent, and the red blood cell is modeled as independent scatterer. This study also develops a practical approximation for the backscattering of periodic sinewave bursts by a volume of randomly distributed scatterers, i.e., whole red blood cells. This expression for the received backscattering ultrasound pressure after the n-th burst of narrowband transducer is obtained from an ideal continuous wave transducer's response.
Characteristics of Corrective Saccadic Eye Movement with E.O.G.
Journal of Biomedical Engineering Research, volume 2, issue 1, 1981, Pages 21~30
In this study, measuring eye movements with E.O.G. to targets beyond 20
from fixation point, results are as follows. (1) When the eyes turn toward targets of more than 20
eccentricity, the first saccadic eye movement falls short of the target. The presence of image of the target off the fovea(visual error signal) subsequent to such an undershoot elicits, after short interval, corrective saccadic eye movements(usually one) which place the image of the target on the fovea. (2) There are different programming modes at retina for eye movement to targets within and beyond 20
from the fixation point. (3) Saccadic system, preparing the direction and amplitude of eye movement completes the corrective saccadic eye movements. (4) Distribution of latency and intersaccadic interval(I.S.I.)are frequently multi modal, with a seperation between modes of 25[msec]. (5) There are two types of saccadic eye movements for the double-step targets. This fact suggests that the visual information is sampled stochastically. (6) The new model of saccadic system including the dissociation of visual functions dependent on retinal eccentricity is required.
Equivalent Circuit Model of Glucose Kinetics
Yun, Jang-H. ; Kim, Min-Chong ;
Journal of Biomedical Engineering Research, volume 2, issue 1, 1981, Pages 31~38
The objective of the present study was to develop an equivalent circuit model of glucose kinetics including the hepatic glucose balance functions which were neglected in the previous compartmental models. Using this circuit model, the insulin resistivity parameter and hepatic glucose sensitivity parameter were estimated in optimal fitting of the model based data of glucose and insulin concentration to the reported clinical intravenous glucose tolerance test(IVGTT) data in normal and diabetic subjects. The addition of the hepatic function in the model has improved the overall performance of the simulation. Also, the computed tissue insulin resistivity and the hepatic glucose sensitivity are shown to be significant in distinguishin four clinical groups of normal and diabetic groups.
A Study on the Phase Identification of Dental Amalgams
Journal of Biomedical Engineering Research, volume 2, issue 1, 1981, Pages 39~46
Microstructural phases of the dental amalgams have been studied by optical microscope, scanning electron microprobe and X-ray diffractometer. r1 (
) phase and r2 (
) phase are found on conventional compositioned alloys. On high copper single compositioned alloy, rl (
) phase and V (
) phase are found but brittle r2 (
Realization of the Dynamic Control System for the Neural Network Analysis of the Cerebellum
Journal of Biomedical Engineering Research, volume 2, issue 1, 1981, Pages 47~54
This paper deals with a new approach to the modelling of neural interactions in the cerebellar cortex to construct a general purpose electronic simulation model. Since physiological data show that cerebellar neural activity changes in an approximately pulse manner in response to pulse stimulation, the differences in timing between excitation and inhibition of cerebellar cells will be treated as pure time delays and the transfer functions of the cells will be presented by pure gains. The parameters to be discussed in this paper are the coupling coefficients between a cell and its several inputs, the magnitude of a coupling coefficient which is presented as a measure of how much influnce a particular has on its target cell. And also this paper has been proposed that the cerrbellum engaged in improving the overall performance of the motor control system, i.e., the cerebellum is a compensator.
Precision DC Amplifier Design using Semiconductor Chopper
Journal of Biomedical Engineering Research, volume 2, issue 1, 1981, Pages 55~64
The important parameters of DC amplifier, which is widely use4 for the medical and engineering fields, are input offset voltage and temperature drift. Chopping amplifier reduces approximately 10% the parameters changing than monolithic operational amplifier. In this study, a chopping amplifier with semiconductor chopper is designed and tested, this chopper is realized by CMOS analog switch and timing circuits. The test results approve that designed amplifier is suitable for precision instrument DC amplifier.
Determining Control Body Dimensions
Journal of Biomedical Engineering Research, volume 2, issue 1, 1981, Pages 65~76
Human body structure can be considered as a complex of many elements such as head, chest, arm, leg and etc. As the correct classification of human body is basic for the design of all the materials used by mankind and since we cannot consider all the elements simultaneously, there is a need of extracting a Sew elements which can be "most" representative of all those elements. This paper describes the procedure of determining those representative body dimensions utilizing the data obtained from a national project carried out in 1976. Also the relationship of the above determined body dimensions to the other commonly reference body dimensions are given in linear forms.ear forms.