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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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Development of Real-time Two-dimensional Doppler Echocardiography and its Clinical Significance
Omoto, Ryozp ;
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 1~4
Balancing left/right cardiac output is essential for the automatic control of total artificial hearts(TAH). A fuzzy logic-based control method is presented. We use left atrial pressure(LAP) and right atrial pressure(RAP) as indicators for left/right balancing. The fuzzy controller has four input variables which are measured LAP and RAP and their gradients. Desired variations in left cardiac output(LCO) and right cardiac output(RCO) are calculated to keep LAP and RAP within the Physiological limits. Computer simulations were performed to adjust fuzzy membership functions for variables and verify this control method. Results from simulations showed that LAP and RAP returned to the physiological limits while AoP and PAP stayed within the physiological limits.
Basic Aspects of Signal Processing in Ultrasonic Imaging
Saito, Masao ;
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 5~8
As the ensemble averaged dz/dt signal during exercise gets smoothed, it is difficult to find the distinctive marks for estimation of stroke volume. The cross correlation function was made use of estmating these marks for automatic calculation by computer from the ensemble averaged dz/dt signal. LVET(Left Ventricular Ejection Time) and stroke volume were estimated based on the calculated parameters from the characteristic points. LVET, stroke volume calculated by hand, by the ensemble average and the cross correlation were compared for accuracy validation.
Asymptotic Expressions for One Dimensional Model of Hemodiafiltration
Chang, Ho-Nam ; Park, Joong-Kon ;
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 9~14
The asymptotic solution using the Tailor series has been given explicit form for the solute concentration and overall solute removal in hemodiafilter using one dimensional model. The numerical solutions have been calculated within 0.001% error by the Romberg integration method. Compared with the numerical solutions, the oneterm asymptotic solutions were found to be within 3% error for the condition > 3.0 and three-terms asymtotic solutions were required for the condition >0.7 where denotes measure of convection over diffusional transport and a the ratio of blood flow rate over dialysate flow rate.
Development of Respiration Monitor using Impedance Pneumograph
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 15~18
In this paper we developed a respiration monitor by an impedane pneumography. This technique, measuring the electrical impedance change of the lungs due to breath, provides the accurate data for the respiration trend and rates. To measure the small impedance difference we designed a special current source which was considered the electrical safety and the interference with the ECG signal.
Analysis on the Velocity Characteristics of the Basilliar Membrane Motion in Cochlea
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 19~24
In this study, the general characteristics, and theories of cochlear concerning with hearing are examined. Also the digital method is studied in order to analyze with microcomputer on the model equation of basiliar membrane in the cochlear derived from 3-dimensional rectangular block model which is studied by Boer. The method is illustrated for the amplitude characteristics of basiliar momtrane wave velocity. The results obtained are as follows; 1. In the magnitude characteristics, the velocity gradually increases from the stapes, shows the maximum magnitude, and then rapidly decreases to the Helicotrema. 2. The characteristics of 3-dimensional model is located between 1-and 2- dimensional models in the velocity characteristics coefficients, magnitude characteristics, and the pattern of 2-dimensional model shoves the different features from the 1-dimensional and 3-dimensional rectangular block model. 3. In the 3-dimensional rectangular block model, the characteristics of the waveform and the maximum resonant point are same whether Z(X) is linear or nonlinear.
Limited View Diffraction Tomography by Inversion of Scattered Data
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 25~32
In this paper a new "limited view frequency correlation algorithm" for diffraction topography is proposed. In this algorithm the problem of limited view sampling is solved by spectrum of spatial frequencies of refractive index. This algorithm is very important in a view of reduction of scanning time and improvement of considerably higher image quality object reconstruction.struction.
A Study of the Factors of Synchronization Model on Myocardial Cell Rhythms
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 33~38
Biological rhythms are very important phenomena to generate, grow a living thing. However, the origin of rhythms are not disclosed completely until now. Eack myocardial cell has a natural rhythm of itself, and synchronization is happened when two cells are come in contact with each other. In this research, a simple synchronization model has been proposed and studied, refering to the physiological model. The changes of the synchronization rhythms in experimental results are compared with that of the model.
Estimation of Ultrasound Attenuation Coefficient by Homomorphic Deconvolution Method
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 39~46
In order to improve the performance of ultrasonic diagnostic equipment, it is important to development the signal processing considering the ultrasonic properties of biological medium and propagation mechanism in tissue. Attenuation coefficient is not only important factor to analyze propagation properties, but also it is significant to estimate it in view of tissue characterization, so we show one of the method to estimate attenuation coefficient of biological tissue and the results of estimation.
A Study on the Fluid Flow by Change of Pressure & Flow in the Collapsible Tube
Kim, Jong-Eok ; Lee, Han-Yeong ; Hong, Gi-Bae ;
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 47~54
In order to research the flow in the thin wall compliant tube, this present study is attempt to measure the cross sectional area according to change of external pressure and flow by ultrasonic method different from willy used impedance technique for flow analysis about one dimensional Steads flow. The experimental results are as follows. 1) Measurement of cross sectional area ratio by ultrasonic method by comparison with experimental results of impedance technique & theoretical results were well consent. 2) Pressure difference of upstream and down stream is alwap's maximum range at 0.4 <
<0.5, and have no connection with changing external pressure. 3) when the external pressure is fixed and resistance is varied, Self excited oscillation occurs in the region at 0.5 <
<0.6, and oscillation disappear almost at R2>=1.2
Ultrasonic Tissue Characterization by Digital Spectrum Analysis Technique
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 55~62
A digital spectrum analysis technique was used to estimate the tissue characteristic parameters (transmission velocity and attenuation coefficient) in the phantom study and the human liver's ultrasound scanning. The soft tissue equivalent phantom was made with the combination materials of agar, water, powdered graphite, and n-propyl alcohol. In the human study, twenty five normal subjects and three patients with liver diseases were studied using the ultrasonic reflection signals and the spectrum analysis method The following results were obtained; 1. The soft tissue-equivalent materical could be produced with various acoustic parameters by changing the composition amount of the powdered graphite and n-propyl alcohol. 2. Attenuation coefficients of normal human liver tissue were estimated to be 0. 36 dB/cm MHz
0.11. In patients with liver disese, tile attenuation coefficients were shown to be different from the above normal values.
A Study on the Microcomputer Based Infusion Pump
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 63~68
The Infusion pump that is widely used in hospital has been designed. This system consists of microcomputer system, stepping motor control part and mechanical part for syringe driving. It has 450mmHg maximum pressure and
0.5% accuracy, and and especially keep the accent on the electrical and functional safety.
Implementation of the Automatic White Blood Cell Differential Counting System
Lee, Seung-U ; Kim, Baek-Seop ; Park, Song-Bae ;
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 69~76
An automatic white blood cell differential counting system was developed, which consists of feature extractor, main control computer, auto focus and search part and data acquisition part. This system is used as a clinical instrument whose purpose is to classify white blood cell images. It may also be used for other binary image processing.
Development of Ultrasound B-scanner(I)-System and Analog Part-
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 77~84
A prototype of a linear real-time ultrasound B-scanner has been developed which has an axial resolution of 1-2mm and lateral resolution of 2-3mm. In the actual hardware and software implementations of the B-scanner, the following features were emphasized; (1) a dynamic focusing to improve resolution; (2) signal processing to obtain low noise image; (3) various functions for the user's convenience' (4) simplification of the system by an extensive use of recently developed LSI's; (5) development of a prototype at the level of a commercial product. This paper reports the experimental results of the overall system and the design approach of the analog part. The work on the digital part of the B-scanner is reported in part (II) seperately
Development of Ultrasound B-scanner(II)-Digital Scan Converter-
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 85~92
A new architecture of the Digital Scan Converter (DSC) for the linear-scan ultrasound medical imaging systems is proposed and its hardware implementation is reported. While the conventional DSC merely displays the acquisited data and does nor allow access to the frame memory, it is possible, in the new system, to access to the frame memory for further imaging processing so as to obtain useful information for medical diagnosis. Image processing can be performed either by a special pupose processor, or by VAX 11/780. The system is made to operate asyncronously to increase the frame rate with tags assigned to the data. The proposed DSC was designed to be used without much modification for the sector scan system as well.
A Study on the Compressed Code for Biological Signal
Hong, Seung-Hong ; Son, Chang-Il ; Min, Hong-Gi ;
Journal of Biomedical Engineering Research, volume 5, issue 1, 1984, Pages 93~102
In this paper, the real-time compressed code generation method for the biological signal data, especially for the Electrocardiogram, is studied. For this purpose, variable length code is introduced. And from this code, we get a exactly the same reconstructed signal data as the original. Experimental results show that this program reduces the data rate by a factor of about 8, and codes the result in a form convenient for analysis.