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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 5, Issue 2 - Dec 1984
Volume 5, Issue 1 - Jun 1984
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Treatment of the Herniated Nucleus Pulposus Syndrome by Chemonucleolysis with Chymopapain
Dabezies, Eugene J. ;
Journal of Biomedical Engineering Research, volume 5, issue 2, 1984, Pages 111~120
A new restoration method of chest X-ray image (dual project filter) was proposed to improve SNR (signal to noise ratio) characteristics. In this method, a priori information of system and anatomical structure and statistics of projected object are used in the design of filter. Dual projection filter varies its parameters, adapting to the local regions of chest(lungregion, mediasternum, subdiaphragm) and the structure of chest (bone, tissue, blood vessel, bronchia). The performance of Dual Projection Filter was 0.1-0.2dB better than Dual Sensor Wiener Filter, which was used for initial estimate of Dual Porjection Filter.
Recent Advancement in Renal Replacement Therapy
Ota, Kazuo ;
Journal of Biomedical Engineering Research, volume 5, issue 2, 1984, Pages 121~126
A new approach to texture classification for quantitative ultrasound liver diagnosis using run difference matrix was developed. The run difference matrix comprised the gray level difference along with a distances. From this run difference matrix, we defined several vectors and parameters such as DOD, DGD, DAD vector, SHP, SMO, SMG, LDE, LDEL etc.Each parameter values calculated in fatty, cirrhotic, normal and chronic hepatitic liver images were plotted in a plane and we found that RDM method was more sensitive to small structural changes than the conventional run length method and showed improved classification ability between the diseases.
Physical and Engineering Aspects of Hyperthermia
Saito, Masao ;
Journal of Biomedical Engineering Research, volume 5, issue 2, 1984, Pages 127~132
This paper proposes the method that evoked potentials stimulated by object colors are analyzed and examined on the phenomemon of color sensory. The method which is used to estimate the signal is time-varying. filtering (TVF).At the results of experiment which used object colors, it is shown that color sensory times of red are within the range of 0.0~0.25[sec], those of yellow are within the range of 0.25~0.55[sec], and those of blue are within the range of 0.55~O.75[sec]; they are inclined to sequence in accending order as red, yellow, and blue.
Estimation of Proportional Control Signal from EMG
Choi, Kwang-Hyeon ; Byun, Youn-Shik ; Park, Sang-Hui ;
Journal of Biomedical Engineering Research, volume 5, issue 2, 1984, Pages 133~142
The EMG signal can be considered as a signal source that expresses the intention of man because it is a electrical signal generated when the man contracts muscles. For proportional control of prostheses, the control signal proportional to the mousle contraction level must be estimated. Typically a foul-wave rectifier and low-pass filter are used to estimate the proportional control signal from the EMG signal. In this paper, it is proposed to use a logarithmic transformation and a linear minimum mean square error estimator. A logarithmic transformation maps the myoelectric signal into an additive control signal-plus-noise domain and the Kalman filter is used to estimate the control signal as a linear minimum mean square error estimator. The performance of this estimator is verified by the computer simulation and the estimator is applied to the EMG obtained from the biceps brachii muscle of normal subjects.
The Study on Electromagnetic Stimulator for Healing of Ununited Fracture
Gun-Ki Lee ; Han ;
Journal of Biomedical Engineering Research, volume 5, issue 2, 1984, Pages 143~148
AB-type block copolymers of poly(r-benzyl L-glutamate) (PBLG, a segment) and polyoxypropylene (POP, Bsegment) were synthesized and they were reacted with polyoxypropylene bis(6-aminohexyl) (POE) to enhance the hydrophilicity of the polymers. The degree of swelling of the POE-crosslinked block copolymers (CPB -2) was higher than that of the block dopolymers (PB). The amount of 5-fluorouracil re-leased from CPB-2 block copolymers was greater than that from the PB block copolymers when they were incubated In the same period. These results indicate that the amount of 5-fluerouracil released from the matrices is proportional to the hydrophilicity of the polymers. Observing polymer surfaces by scanning electron microscope, pores (diameter, 0.5-1.5
m) were appeared on the surface of CPB-2
Design of the Digital X-ray System using Photo-diode Arrays
Journal of Biomedical Engineering Research, volume 5, issue 2, 1984, Pages 149~154
A digital X-ray system was designed using photo-diode arrays. This system consists of the following five sub-units; (1) slit and driving system (2) X-ray detection system (3) data-conversion system (4) computer (5) image display system. Using this system, one can obtain scatter-free, high contrast, digitally formatted, high quality image, as compared with the conventional film-based X-ray system.
A Study on the Patient Data Back-up System
Journal of Biomedical Engineering Research, volume 5, issue 2, 1984, Pages 155~160
In this paper, the patient data back-up system for medical and engineering field was designed. The system consists of 8-bit microprocessor, cassette recorder and data acquisition & control logic. To Inake data reduction, a Marked CORTES Algorythm which can be easily reconstructed was also designed in real time mode. In results, a Marked CORTES Algorythm produced about 35% data reduction rate and reconstructed good original data that are suitable Medician's reading.
Two-dimensional Model Analysis on Cochlear Basilar Membrane Motion
Yu, Seon-Guk ; Baek, Seung-Hwa ; Park, Sang-Hui ;
Journal of Biomedical Engineering Research, volume 5, issue 2, 1984, Pages 161~166
In this paper, we describe an effective technique for computing the steady-state motion in a two-dimensional cochlear model. With the cochlear fluid assumed incompressible and invisid, the problem reduces to solving an integral equation for a region with yielding boundary. Using the conformal mapping, Jacobian elliptic function and hyperbolic function, a pair of second-order differential equation is derived. What we will show in this paper is that by appropriately transforming integral equation, the same computation can be performed with comparable accuracy in a short time.
A Study Left Ventricular Volume Change Measurement using Nuclear Stethoscope
Min, Byeong-Gu ; Kim, Yeong-Ho ; Go, Chang-Sun ;
Journal of Biomedical Engineering Research, volume 5, issue 2, 1984, Pages 167~172
In the present study, we developed a nuclear stethoscope interfaced with a personal computer (APPLE- II) and evaluated it's performances as compared with the gamma camera. This single-probe, ECG-gated system has been used for displaying the left ventricular time-activity curves, the peak ejection time and its rate, the peak filling time and its rate, and the R-R interval distribution. The radioactivity was measured at every 10msec around the ventricular region, where the activity curves shows the maximal peak to peak variations. The background activity was measured around the lung area showing its counts approximately 50% of the end-diastolic count with minimal variations. The average time-activity curves of 100 beats were used for analysis in the equilibrium study after intravenous injection of 15-20mCi of Tc. The ejection fractions measured by the nuclear stethoscope(Y) were compared with those measured by gamma camera(X) in 47 patients with various heart diseases. The correlation coefficient between two measurements was 0.766 with a relation of Y=1.04 x-8.48. Also, the high reproducibility was obtained for the same patient. Also, the high reproducibility was obtained for the same patient. From this study, we conclude that this device is useful for continuous monitoring in the intensive care unit, as it is portable, compact, and inexpensive.
A Digital Filter for the Qrs Complex Detection Based-on Microcomputer
Journal of Biomedical Engineering Research, volume 5, issue 2, 1984, Pages 173~182
This paper represents a algorithm which improves the some drawbacks in the past methods for detecting QRS Complex waves. This proposed algorithm is very useful to detect correctly QRS Complex not only in a normal ECG, but in the abnormal ECG such as contaminating the noise with high amplitude, the existence of sharp T wave, and abrupt stepwise fluctuation of the base line.