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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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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 Microcomputer-based EEG Spike Detection System
Journal of Biomedical Engineering Research, volume 2, issue 2, 1981, Pages 83~88
A method of detecting abnormal spikes occuring in the EEG of subjects suffering from epilepsy is studied. The detection scheme is to take the first derivative of EEG and to determine if it exceed some threshold value. This study is focused on the digital signal processing for detecting abnormal spikes using microcomputer.
A Numerical Study on the Blood Flow through a Disc Type Heart Valve
Journal of Biomedical Engineering Research, volume 2, issue 2, 1981, Pages 89~102
The recirculating flows which occur in the prosthetic heart valve have been known to cause several diseases in the human body. And the recent studies show that the shear stress at the wall of the artery is also very important factor in the formation of thrombus. And many studies knave been devoted in obtaining more information about the blood flow through the prosthetic heart valve. In this Paper, the steady axisymmetric flow through the Disc-Type Heart Valve is studied by using the numerical method. The geometry of the Disc-Type Heart Valve is simplified, and the flow is assumed to be steady axisymmetric flow. The vorticity transport equation derived from the Wavier-Stoke's equation is used as the governing equation, and the explicit finite difference method is used to obtain the steady state solution. The results for several Reynolds numbers show that the recirculating flow becomes large as the Remolds number increases. Furthermore, it can be shown that the magnitudes of the vorticity and the stresses are also increased with the Reynolds number, but there is only a little change in their configurations of distribution and in their positions of maximum values.
The Reaction Time and Accuracy of Saccade Eye Movement Using Random Signal
Journal of Biomedical Engineering Research, volume 2, issue 2, 1981, Pages 103~108
In this paper, the reaction time and the accuracy of saccade eye movement are measured by using random pulse and periodic pulse, random pulse step and periodic pulse step through the subject utilizing the infra-red method.
Digital Subtraction Technique for Intravenous X-ray Image System
Journal of Biomedical Engineering Research, volume 2, issue 2, 1981, Pages 109~116
The objective of this research is to develop the hardware and software systenls of the digital intravenous angiographic system. The system will be used in clinical diagnosis of cardiovascular and cerebrovascular diseases. By utilizing computer image processing technique and digital subtraction method, the system can decrease the patient's harzard and expenses in performing intravenous angiography, as compared with conventional angiograms of the arterial injection.
A Study on the Development of Patient Monitoring System
Journal of Biomedical Engineering Research, volume 2, issue 2, 1981, Pages 117~126
Patient monitoring system, which is one of widly used medical electronic equipment in clinics, is developed. This prototype bedside monitor is considered that can measure electrocardiograph, photoplethysmograph, heart rate, respiratory, body temperature, and etc. Some clinical tests are performed and considered with its usefulness for patient monitoring items.
Information Processing Characteristic for Changes in Impulse Patterns in the Neuron Pool
Kim, Yong-Man ; Lee, Kyung-Joong ; Lee, Myung-Ho ;
Journal of Biomedical Engineering Research, volume 2, issue 2, 1981, Pages 127~140
This paper describes the mechanism of information processing in the nervous system through neuron pool model which is consisted of six single neural models. In the neuron pool model, summation characteristic of stimulus satisfies those of real nervous system and output impulse rate increases linearly to the input stimulus. Occlusion phenomena of the neuron pool model is approached to those of real nervous system and also if the threshold potential within sutlirninal fringe is increased, facilitation phenomena appreared. Therefore, the results of this study suggest that we can construct large neuron pool with many single neural models and verify the mechanism of information processing in the wide part of nervous system.
Effects of Refraction of Ultrasonic Beam on B-mode Tomograms
Journal of Biomedical Engineering Research, volume 2, issue 2, 1981, Pages 141~144
This paper descirbes about effects of refraction of ultrasonic beam on B-mode tomogram. Both compution based on Snell's law and the experiments performed using B-mode scanner and schlieren optical method are discussed on a circular phantom immersed in water. In these results, if the discrepancy of sound velocity is more than 0. 6%, the distortion of the B-mode image becomes conspicuous and a target beyound the phantom may disappear or displayed as two targets depending on the velocity of the phantom.
Predictive Characteristics of the Oculomotor System to the Periodic Signal
Journal of Biomedical Engineering Research, volume 2, issue 2, 1981, Pages 145~150
In this paper, we measured the tracking response time of horizontal eye movement to the target moving according to the square waveform to investigate the predictive characteristics of the human oculomotor system. And in the experiment we used the square waves with an amplitude of 5 degree and frequencies o.1, 0.2, 0.4, 0.6, 0.8, 1.0, and 1.2 Hz. Random occurrences of the human eye movement reponse time were analyzed using a finite Markov chain process and we found the results as follows. From both the experimental and theoretical results, we found the trend showing that Predictive characteristics moved from the transient state to the steady state.
A Modified Hodgkin-Huxley Model
Journal of Biomedical Engineering Research, volume 2, issue 2, 1981, Pages 151~158
A modification of the Hodgkin-Huxley equations was done with the changes of the binding sitea for the sodium and potassium channels. The computer simulation results agree well with the currant experiments. Thus, the contradictory problems that Suh had indicated previously can be solved. And also, the results show that the sodium and potassium channels play an important role in the firing and the leakage channel does not.