Go to the main menu
Skip to content
Go to bottom
REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Biomedical Engineering Research
Journal Basic Information
Journal DOI :
The Korea Society of Medical and Biological Engineering
Editor in Chief :
Volume & Issues
Volume 21, Issue 6 - Dec 2000
Volume 21, Issue 5 - Oct 2000
Volume 21, Issue 4 - Aug 2000
Volume 21, Issue 3 - Jun 2000
Volume 21, Issue 3 - Jun 2000
Volume 21, Issue 2 - Apr 2000
Volume 21, Issue 1 - 00 2000
Selecting the target year
다차샘플링을 이용한 초음파 영상 시스템의 인체실험
나병균 ; 안영복 ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 1~1
The most important factor in embodying the digital beamforming technology is finding a sampling method that has negligible detection error and can be implemented with simple hardware. Particularly. since an identical sampling circuit is used in each element of the transducer array it is very important to reduce an amount of the hardware of the necessary sampling circuit. The second-order sampling method has been proposed as the most appropriate smapling methed for embodying a digital beamforming technology because of its simple implementation. But its application for a wide-bandwidth signal which is usually in a ultrasonic scanner results in a large error when detecting an envelope. We have proposed the multi-order sampling method for reducing beamforming error in the conventional second-order sampling method. In this paper, the performances of the multi-order sampling method are compared with one of the second-order sampling method using experimental data corrected on human body. The results show that the multi-order sampling method, especially fifth, seventh-order sampling methods. has a much better performance than the second-order sampling method in beamforming of ultrasonic imaging system.
척추 생검 모의 실험기에서 볼륨 렌더링된 영상 내 바늘 움직임 도시기법
김근호 ; 나종범 ; 박현욱 ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 9~9
Spine biopsy is an accurate diagnostic tool to detect spine tumor. The purpose of this project is to develop a spine-biopsy training simulation system which will provide a realistic visual and force feedback information to the user during training. In this paper, we represent a combination method of a volume-rendered image and a surface-rendered needle image using Z-Buffer. Since there are many critical organs not to be damaged near spine, the spine biopsy operation includes complicated and detail procedures. Therefore, the skilled training of operation is required before medical doctors operate the patients directly. In the current spine biopsy operation the medical doctor observes 2D CT slices and then he observes the objective place that the disease ares is expected and the path that a needle enters in 2D plane. We have developed the visual feedback system to combine the needle image with 3D volume rendered image in order to visualize the needle motion in a real time.
한국사람의 시체를 이용한 심장의 3차원 가상해부 풀그림
정민석 ; 김민구 ; 박승규 ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 17~17
Three-dimensional (3D) structure of the heart should be understood for accurate diagnosis and treatment of heart diseases. Two-dimensional (2D) tools (e.g. anatomy books) or traditional 3D tools (e.g. plastic models) are not sufficient for understanding 3D structure of the heart. The heart of a cadaver may not always be available for dissection when it is needed. To overcome this problem, virtual dissection programs of the heart have been made. However, most programs include radiographs that do not reveal true color and have limited resolution. Moreover, it is necessary to make a virtual dissection program of each race and ethnic group. Thus, we attempted to make a 3D virtual dissection program of the heart using a Korean cadaver in order to help medical students and doctors better undertand 3D structure of the heart. Heart was extracted from a Korean male cadaver. The heart was embedded with gelatin solution and serially-sectioned with 1 mmthichness using a meat slicer 153 sectioned specimens were imputted into the computer using a scanner (500×400 resolution true color). 2D imges of the heart were aligned on the alignment progrm which was composed using IDL language. In 2D images the heart components were manually segmented. 3D image of the heart were reconsturcted through the volume-based rendering of 2D images. With 3D image as the main feature the virtual dissection program of the heart was composed using IDL language. Various virtual dissection functions such as sectioning a heart at free angles to show its plane, identifying the heart components represented in the sectioned plane, and rotating the selected heart components at free angles, were established. This 3D virtual dissection program of the heart made of Korean cadaver is helpful in better understanding 3D location and shape of the heart components: it is expected to be used through CD-title or Internet as an educational tool for medical students and doctors.
뉴로-퍼지를 이용한 움직임·호흡률 적응형 페이스메이커 알고리즘
신재우 ; 윤정한 ; 윤영로 ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 23~23
Former fuzzy-pacemaker algorithms could combine inputs from sensors effectively, but it has been in difficulties for the implementation because of complex calculation and limitation of memory. In this paper, pacemaker algorithm which controlled heart rate adaptively by motion and respiratory rate was proposed. Consequently the inferred heart rate by using neuro-fuzzy method was more accurate than by using normal fuzzy table look-up method and applicability to a real pacemaker system was achieved by reduced mapping of neuro-fuzzy consequential table, which was accomplished to operations to wish with a shift operator and 1K memory bytes.
뇌자도 측정을 위한 40채널 SQUID 시스템 개발
이용호 ; 김진목 ; 권혁찬 ; 박용기 ; 박종철 ; 이동훈 ; 안창범 ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 31~31
A low-noise 40-channel superconducting quantum interference device (SQUID) system was developed for measuring neuromagnetic fields. The main features of the system are use of a double relaxation oscillation SQUID(DROS) a second generation SQUID and a planar gradiometer for measuring magnetic field components tangential to the head surface. The DROSs with high flux-to-voltage transfers enabled direct readout of the SQUID output by room-temperture preamplifier and simple flux-locked loop circuits could be used for SQUID operation. The pickup coil is an integrated first-order planar gradiometer with a baseline of 40mm. The average noise level of the 40 channels is around 1.2 fT/cm/√Hz at 100Hz. corresponding to a field noise of 5fT/√Hz at 100 Hz. operated inside a magnetically shielded room. The SQUID insert was designed to have low thermal load minimizing the loss of liquid helium. The signal processing software provides digital filtering spectral analysis and isofield mapping. The 40-channel system was applied to measure auditory-evoked neuromagnetic fields.
신경망을 이용한 호흡근육 활동신호의 경계점 추정
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 39~39
Analysis of respiratory electromyographic(EMG) singnals in the study of respiratory control requires the detection of a burat activity from background and the determination of boundaries(onset and cessation points) of the burst activity. This paper focuses on the boundary estimation of respiratory ENG signals using neural networks. In most EMG signals, transitional signal patterns between the burst activity and the background are so diverse that it is hard to define clearly the real boundary. In this paper, all probable boundaries between the burst activity and the background are selected, and then estimated probabilities using neural networks are attributed to them. The final boundary for a given burst activity is the boundary estimate with the maximum a posteriori probability. The experimental results show that the proposed neural network based method for boundary determination is reliable and useful when compared to boundaries chosen by experts on the same EMG singnals.
플로프로필렌/폴리디메틸실록산 복합막과 폴리프로필렌 다동막의 혈액적합성
이삼철 ; 김기범 ; 김민호 ; 정경락 ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 47~47
This paper investigated a new technique for minimizing membrane fouling. We have newly fabricated polypro-pylene(PP)/polydimethylsiloxane(PDMS) membranes which combined PP membrane, a microporous support layer with PDMS. The gas permeability of each PP/PDMS membrane was almost constant before and after the whole blood test by Lee-White method while PP membrane was significantly reduced. The surface of PP membranes were clogged after the blood test. while that of PP/PDMS membrane was not greatly changed. The amount of platelet adhesion on the PP/PDMS membranes was smaller than that on the PP membrane therefore serum leakage of the PP/PDMS membrane was significantly reduced.
Bone Plate용 Ti합금과 알루미나에 Coating된 항균성 Hydroxyapatite의 생체적합성 연구
김택남 ; 김윤종 ; 임혁준 ; 황득수 ; 김정우 ; 이해영 ; 김종옥 ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 55~55
The hydroxyapatite which is well known as its biocompatibility with human had tissue was made by wet chemical process. HAp coating on Ti-6Al-4V and alumina was performed by IBAD for the development of new bone plate. The silver impregnation using 10, 20, 100ppm of AgNO₃solution was done in HAp of Ti-6Al-4V and alumina in order to substitute the Ca in HAp by Ag ion. The antimicrobial effects and biocompatibility of Ag-HAp coated Ti-6Al-4V coated Ti-6Al-4V and alumins were evaluated by incubation with bacteria such as E. coil(DH5a). P. aeruginosa. S. epidermidis. The very antimicrobial effect was observed in 20ppm AgNO₃treated Ti-6Al-4V and 100ppm AgNO₃treated alumina. However, the biocompatibility with macrophage and osteoblast was only observed in 10ppm AgNO₃impregnated in Ti-6Al-4V and alumina. In order to investigate the antimicrobial mechanism of Ag ions in bacteria transmission electron microscope(TEM) study of the Ag-HAp treated E. coli was performed. The cell wall and cytoplasm was destroyed in Ag-HAp treated E. coli and the black spot was observed inside the bacteria. Fortunately, the Ag ions was detected in black spot inside E. coli using energy dispersive spectroscopy(EDS). Thus, it can be concluded that the Ag ions destroy effectively the E. coli and it showd the antimicrobial effects.
백내장에서 상분리 현상
조창호 ; 성승훈 ; 정웅희 ; 이상수 ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 65~65
Phase separation phenomenon was studied in the cold cataract of lens from fetus through the light scattering. The coexistence curve was determined as a function of water concentration. The phase separation temperature was observed to increase near the center of nucleus. The increase of salt concentration caused an increase of the phase separation temperature. Ginseng saponin and vitamin-E lowered the phase separation temperature 1.3℃ and 3.5℃ respectively.
전력관리기능을 가진 볼륨제어방식의 마취기용 인공호흡기의 구현
이종수 ; 김영길 ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 71~71
The nesthesia ventilator, is used to general anesthesia for a surgical operation, must guarantee safety of the patient on power failure. This paper introduce several method to reduce power consumption during the system desing level and implement a anesthesia ventilator using volume control. The anesthesia ventilator prepare for hazard component and unstable power supply. Also it need the power management to increase operating time by maximized power efficiency for the surgical to spent long time. The implemented system have more increased operting time then old system during battery operation and acquire the battery charger to prevent overcharging, the reduction of charging time and deveral function by centralization.
채승표 ; 이정우 ; 장우영 ; 송병섭 ; 김명남 ; 김시열 ; 조진호 ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 77~77
ERG signal represents responses of the each layer of retina for the visual stimulus and accumulatd responses of retina according to visual signal processing. By investigating the reaction types of each wave of ERG. the various kinds of information needed for the diagnosis and concerning the signal processing mechanisms occurring on the retina layer and linear summation of them with the Shah's Computer Retina model which is one of the most reliable retina model recently developed. The generated ERG was compared with the typical ERG and showed the very close similarity. And by changing the parameters of the retina model, the diagnostic investigation was performed with the variation of the ERG waveform.
핵심감압술에 의한 초기 대퇴골두 무혈성 과사증 치료시 괴사영역의 위치와 천공방향의 변화에 따른 생체역학적 분석
임도형 ; 이성재 ; 김정성 ; 신정욱 ; 김용식 ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 87~87
The purpose of this study was to evaluate a hypothesis that small changes in the core placement direction during the surgical management for the early osteonecrosis of the femoral head (ONFH) could affect its surgical outcome. For this the three dimensional finite element models were constructed to simulate relevant surgical situations with changing core placement and necrotic regions of the femoral head. Stress transfer behaviors due to surgery were investigated by calculating the volumetric percentage within the necrotic region of the femoral head utilizing finite element method (FEM). Results indicated that the posterior core placement was more effective than the corresponding anterior or central placement regardless of necrotic region or surgical methods. The difference in efctiveness ws quite similar in different surgical methods. Particularly, the maximum percent reduction of malignant stress levels with the posterior core placement was greater by 2.5 to 12 times than those with the anterior placement for the stress level of beyond 11MPa and 5-11 MPa, respectively. In conclusion, our study suggests that the structural reinforcement can be most effective when the core is placed as posteriorly as possible regardless of surgical methods or necrotic distributions as long as the core is kept within the necrotic region.
전방십자인대의 In vivo 변형률 측정
차희상 ; 이상훈 ; 유석주 ; 차은종 ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 95~95
Many devices and methods have been developed to measure the anterior cruciate ligament laxity of the knee joint but there were any intra-inter observer errors due to their indirect methods measuring ACL laxity by tibial displacement against the femur. During arthroscopic examination surgeons can probe, feel and grossly determine its laxity, but although a complete ACL tear can be diagnosed by probing, the apparently intact but partially injured ligament is more difficult to evaluate. So we developed an instrument that could measure the strain of the ACL in vivo, and evaluated its feasibility in comparison with conventional diagnostic methods. According to their laxity all ACLs were classified and measured in three groups, normal, slight lax, and severe lax(ACL rupture)group. The results were that strains in each groups were different significantly and the measurements of this instrument was not different significantly in comparison with conventioal diagnostic methods. It means that the approaches can be used to diagnose the ACL's tear more easily and less invasively. Moreover, it would be useful in studying the biomechanical properties of knee.
A Study on the Delaunay Triangulation Reconstruction using the Modified EVS
Gwon, Ui Cheol ; Kim, Dong Yun ; Sin, Dong Gyu ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 225~225
Evaluation of Image Quality in Super-resolution image Guide for Ultrathin Endoscope
Lee, Bong Su ; Choe, Won Yeong ; O, Chang Hyeon ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 233~233
3D Medical Image Segmentation Using Region-Growing Based Tracking
Go, Seon Yeong ; Lee, Jae Yeon ; Im, Jeong Eun ; Na, Jong Beom ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 239~239
Efficient Compression of MR Images Using Fractal Coding in Wavelet Transfrom Domain
Kim, Hyeon-Sun ; Bae, Seong-Ho ; Yun, Ok-Gyeong ; Kim, Jan-Hwan ; Park, Cheol-Hyeon ; Lee, Seong-Gi ; Park, Gil-Heum ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 247~247
A FSK Radio-teltmetry System for Monitoring Vital Signs in UHF Band
Lee, Hun Gyu ; Park, Dong Cheol ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 255~255
Wall Shear Stress Distribution in the Abdominal Aortic Bifurcation : Influence of wall Motion, Impedance phase Angle, and non-Newtonian fluid
Choe, Ju-Hwan ; Lee, Jong-Seon ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 261~261
Electrochemical Behavior and Morphology of Anodic Titanium Oxide Films
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 273~273
Design of Femoral Tunnel Entrance to Operate Notchplasty
Jeong, Gu Yeon ; Han, Jeong Su ; Kim, Gyeong Tae ; Lee, Tae Hui ; An, Jae Yong ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 279~279
Age-related Gometric Effects on the Human Lumbar Spineby the Finite Element Method
Kim, Yong ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 285~285
The Mechanical Sensitivity at Interfaces between Bone and Interbody cage of Lumbar Spine Segments
Kim, Yong ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 295~295
A Syudy on the Quantitative Evaluation of Spasticity Implementing Pendulum Test
Lee, Yeong Sin ; Im, Hyeon Gyun ; Jo, Gang Hui ; Kim, Bong Ok ; Chae, Jin Mok ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 303~303
The Evaluation of Artificial Lung Using Bliid Substitutes
Lee, Sam Cheol ; Kim, Gi Beom ; Hong, Seong Chul ; Kim, Min Ho ; Jeong, Gyeong Rak ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 311~311
Computerized Multiple 15-hue tests for Quantifying Color Vision Acuity
Choe, Min Ju ; Go, Seong Taek ; Hong, Seong Cheol ;
Journal of Biomedical Engineering Research, volume 21, issue 1, 2000, Pages 321~321