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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 8, Issue 2 - Dec 1987
Volume 8, Issue 1 - Jun 1987
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Fetal ECG Extraction using Digital Signal Processing
Journal of Biomedical Engineering Research, volume 8, issue 1, 1987, Pages 1~6
In this study, we described the result of computer simulation which is real time extraction of FECG and FHR using adaptive digital signal processing. And we designed 2 channel cassette interface circuit to save FECG signal.
Ultrasonic Mobility Aids for the Blind using Time Scaling Method
Journal of Biomedical Engineering Research, volume 8, issue 1, 1987, Pages 7~12
In this paper, we proposed the time scaling method for the ultrasonic aids for the blind. This system is simplified by using the analog delay line(BBD) for the time scaling of echo signals and the experimental results show the propsed method is superior to the conventional frequency mapping method.
Swelling and Thermal Properties of Crosslinked Poly(2-Hydroxyethyl Methacrylate) Hydrogels
Seong, Yong-Gil ; Nam, Gi-Ho ; Kim, Gye-Yong ;
Journal of Biomedical Engineering Research, volume 8, issue 1, 1987, Pages 13~28
Crosslinked poly(2-hydroxyethylmethacrylate) has been prepared by polymerizing 2-hydroxyethyl methacrylate(HEMA) with crosslinkers such as ehyleng glycol dime- thacrylate(EGDMA), tetraethylene glycol dimethacrylate(TEGDMA), tetraethylene glycol diacrylate(TEGDA), divinyl benzene(DVB), and N, N-methylenebisacry- lamide(MAB) in the presence of initiator
-azobisisobutyronitrile at 60。C, The synthesized copolymers were identified by FT-lR spectrophotomether. The swelling properties of the crosslinked copolymers in various solvents such as water, methanol, ethanol, n-propanol, and n-butanol were investigated at different temperatures. The thermal properties of the crosslinked coplymers were also measured by differential scanning calorimetry(DSC) and thermogravimetry(TG)
Copolymerization of 2-Hydroxyethyl Methacrylate with Functional Silane Monomers
Sung, Yong-Kiel ; Lee, Chang-Gyu ; Jung, Il-Nam ;
Journal of Biomedical Engineering Research, volume 8, issue 1, 1987, Pages 29~40
2-Hydroxyethyl methacrylate(HEMA) was copolymerized with allyltrimethylsilane- (ATMS) and allylt.imethoxysilane(ATMOS) at 70。C in N, N'dimethylformamide- (DMV) using
'-azobisisobutyronitrile(AIBN). The compositions of unreacted monomers were determined by gas chromatographic analysis. The monomer reactivity ratios were determined by Fireman-Ross, Helen-Tiidus and intersection methods. The average values are as follows : $$r_1(HEMA) : 6.62
0.07, r_2(ATMS) : 0.07
0.01 for HEMA-ATMS system.$$ $$r_l(HEMA) : 4.09
0.14, r_2(ATMOS) : 0.06
0.01 for HEMA-ATMOS toys tem.$$ The lower rl(HEMA) In the HEMA-ATMOS system as compared to HEMA ATMS system may be contributed to higher relative reactivity of ATMOS toward the poly(HEMA) radical. The compositions of synthesized copolymers were determined from silicon con tents estimated gravimetrically. The thermal stabilities of the copolymers were investigated by thermogravimetry(TG). The enthalpic changes associated with the endothermic transition were evaluated by differential scanning calorimetry(DSC). The swelling properties of the copolymers in water were also investigated.
A Study on the Correction of Beam Pattern for the Ultrasonic Attenuation Coefficient Estimation
Kim, Gi-Uk ; Choe, Heung-Ho ; Hong, Seung-Hong ;
Journal of Biomedical Engineering Research, volume 8, issue 1, 1987, Pages 41~48
In estimating the freguency-dependent attenuation coefficient, we analyzed the range-dependent ultrasonic beam and proposed the method of calculating the experimental equation of beam pattern in order to reduce the error on the influence of beam pattern. These experimental equations are divided into the spectral centroid and the spec ural standard deviation slope according to axial propagation length. These are repnesented by the first-order equation in the near field of the beam and the second- order eqLlatlon In the far field. In order to prove the validity of this method, the attenuation coefficients of the non-corrected ease and the corrected case are compared. Using the reflected signal from acryle plate, the attenuation coefficients were estimated by the spectral shift method ann the spectral difference method. The result shows attenuation coeffi talents after correction are better than attenuation coefficients before correction. And this method can be applied In vivo measurement.
A Design of Locomotion System of a Mobile Robot for the Blind Guidance
Kim, Byung-Soo ; Chang, Won-Suk ; Hong, Seung-Hong ;
Journal of Biomedical Engineering Research, volume 8, issue 1, 1987, Pages 49~56
This paper designed LOCOMOTION SYSTEM of a mobile robot for the blind guidance and LOCOMOTION COMMAND SYSTEM that gave the moving path to the locomotion system. This system analyzed COMMAND and calculated the speed and direction of the robot. And during locomotion it measured wheel's rotation number for the position and speed control. Also, this system was considered about the 110 interface with host computer and the locomotion method for the blind. In the locomotion experiment the standard speed of robot was 0.4m/sec and the locomotion error was below 5%
A Thoracic Model using Three-dimensional Finite Element Method
Deok-Won Kim ;
Journal of Biomedical Engineering Research, volume 8, issue 1, 1987, Pages 57~62
A three-dimensional thoracic model was constructed using 8-node trilinear hexahedron elements. A three-dimensional steady-state finite element code was developed using FORTRAN. Its output consists of potential at each node. current In each element, and total current In each layer in the z-direction. The thoracic model was Implemented to calculate basal impedance(Zo) In Impedance CardiograPhy Generalized Laplace's equation was solved with Dirlchlet(constant potentials) and homogeneous Neumann(no flux) boundary conditions. It was found that the con structed thoracic model was reasonable since the calculated potential differences between the adjacent electrodes and basal impedance were about the same as the measured ones.
Thermal Distribution and Development of RF Hyperthermia for Cancer Treatment
Journal of Biomedical Engineering Research, volume 8, issue 1, 1987, Pages 63~68
The biological effects for the use of hypertherinla to treat malignant tumors has been well studied and encouraging clinical results have been reported. However, the engineering and technical aspects of hyperthermia for the deepseated tumors has not been satisfactory. We have developed the FF capacitive hyperthermia device(GHT RF8)by cooporation with Yonsei Cancer Center and Green Cross Medical Equipment Corporation. It was composed with 8.10 MHz RF generator, capacitive electrode, matching system, cooling system, temperature measuring thermocouples and control PC computer. We have measured the temperature and thermal distribution in agar phantom, animals and human tumors.
A Study on Power Spectral Estimation of Background EEG with Pisarenko Harmonic Decomposition
Jeong, Myeong-Jin ; Hwang, Su-Yong ; Choe, Gap-Seok ;
Journal of Biomedical Engineering Research, volume 8, issue 1, 1987, Pages 69~74
The power spectrum of background EEG is estimated by the Plsarenko Harmonic Decomposition with the stochastic process whlch consists of the nonhamonic sinus Bid and the white nosie. The estimation results are examined and compared with the results from the maximum entropy spectral extimation, and the optimal order of this from the maximum entropy spectral extimation, and the optimal order of this model can be determined from the eigen value's fluctuation of autocorrelation of background EEG. From the comparing results, this method is possible to estimate the power spectrum of background EEG.
A Study on the Development of CW(Continuous-Wave)Doppler System for measuring Bi-directional Blood Flow Information
Journal of Biomedical Engineering Research, volume 8, issue 1, 1987, Pages 75~80
With the conventional CW Doppler velocity meter, bl-directional velocities cannot be separated. The new CW Doppler system uses quadrature detection and phase rotation to produce simultaneous independent audio and velocity signals for forward and reverse blood flow direction, is fabricated. Specially, this system shows that phase rotation method for flow direction separation provides easy and satisfactory feature. From in vivo blood flow measurement, we can easily differentiate typical artery flow from vein flow, and measure both velocity characteristics qualitatively.
Extraction and Shape Description of Feature Region on Ocular Fundus Fluorescein Angiogram
Go, Chang-Rim ; Ha, Yeong-Ho ; Kim, Su-Jung ;
Journal of Biomedical Engineering Research, volume 8, issue 1, 1987, Pages 81~86
An image feature extraction method for the low contrast fluoresceln angiogram in dlabetes was studied. To obtain effective image segmentation, an adaptive local difference image is generated and relaxation process are applied to this difference Image. By the use of distance transformed data with segmented image, shape and location of feature regions were obtained. It was shown that the location and shape descriptions of Impaired blood vessel networks and retinal regions are can he utilized for the diagnosis of diabetes and other disease.
Synthesis and Characterization of Artificial Skin based on Polypeptides
Kim, Seon-Jeong ; Min, Dong-Seon ; Kim, Gye-Yong ;
Journal of Biomedical Engineering Research, volume 8, issue 1, 1987, Pages 87~92
In order to evaluate the artificial skin for burn would covering materials, copoly(N. carbobenzoxy-L-Iysine-L-leucine)s were prepared by Ipolymerization of N - carbobenzoxy-L- I sine anhydride and L-leucine anhydride in homogeneous solvents using triethylamine as an initiator. The synthetic polypeptides and the oxter type polyurethane(PV)of medical grade were used as the sheet type membranes were prepared ; monolayer membrances were composed of only the polypeptides, bilayer membranes and blend membranes were controlled by composition of the polypeptides and PU. Test of the swelling degree, mechanical tensile strength, elongation, oxygen permeability, water-vapor loss and In vitro degradation treated by pretense TV of samples of artificial skin were measured by adequate methods so as to mechanical, physincal characterization and biodegradation. As a result, all the values of samples were found to be similar to desired value of skin which was nature. The Artificial skin based on polypeptides can be considered as ideal burn wound covering materials.