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혈청 HBV bDNA 음성이나 간기능검사 이상을 보인 만성 B형 간염 환자들의 임상상
김상진 ( S. J. Kim ),박중원 ( J. Park ),김진희 ( J. H. Kim ),홍요한 ( Y. H. Hong ),정혜령 ( H. R. Jung ),김형준 ( H. J. Kim ),도재혁 ( J. H. Do ),유병철 ( B. C. Yoo ),박실무 ( S. M. Park ) 대한소화기학회 2002 대한소화기학회 춘계학술대회 Vol.2002 No.-
<목적> B형 간염바이러스(HBV)의 증식이 억제되면 만성 B형 간염의 활동성은 감소되며 이러한 이유에서 라미뷰딘과 같은 항바이러스제들을 치료제로 사용하고 있다. 그러나 HBV의 혈중 농도는 낮으나 간기능검사 이상을 보이는 만성 B형 간염 환자들이 상당수 있어 그 원인 규명이 필요한 실정이다. 이에 연구자들은 혈청 HBV branched DNA(bDNA) 음성인 만성 B형 간염 환자들을 대상으로 간 기능검사 이상과 관련될 수 있는 임상적 원인들을 조사하
채널별 음장분포 분석을 통한 진단용 초음파 어레이 프로브의 평가방법에 관한 연구
유병철,최흥호,노시철,민해기,권장우,Yoo, B.C.,Choi, H.H.,Noh, S.C.,Min, H.K.,Kwon, J.W. 대한의용생체공학회 2006 의공학회지 Vol.27 No.5
The acoustic field analysis method is the superior calibration method for rectifying the ultrasonic probe sensitivity. This method also can be applied to evaluate the probe performance in clinical fields without numerical analysis and precise measurements. In this paper, we propose the method of acoustic field pattern analysis with probe channel division for the evaluation of diagnostic ultrasound probe characterization. In order to verify our purpose, we performed a set of experiments. We measured the acoustic-field pattern of the three inferiority probes by channel division to evaluate an acoustic field distribution and impulse response characteristics. By comparing the results of acoustic field measurement method with that of conventional method such as impulse response and live image test for linear array probes, it is demonstrated that the ultrasound field measurement method is more effective then conventional method in detection of defective elements.
[論文] 4氣筒 4사이클 스파크 點火機關의 性能 및 排氣組成 豫測에 關한 硏究
유병철(B.C.Yoo),최영돈(Y.D.Choi),이병해(B.H.Lee),윤건식(K.S.Yoon) 한국자동차공학회 1988 오토저널 Vol.10 No.4
In this study, the computer program was developed to predict the engine performances and exhaust emissions of a 4-cylinder 4-stroke cycle spark ignition engine including intake and exhaust system.<br/> The simulation models applied to each process were as follows. For the combustion process, two zone model which requires only one empirical constant was applied, and for the gas exchange process, the method of characteristics that allows the calculations of the time variation and spatial variation of properties along the pipes was used. Constant pressure perfect mixing model was applied to take into account of the interaction at manifold branchs. To predict exhaust emissions, twelve chemical species were considered to be present in combustion products. These species were calculated through equilibrium thermodynamics and kinetic theory.<br/> The empirical constants reduced to least number as possible were determined through the comparison with the experimental indicator diagram of one particular operating condition and these constants were applied to other operating conditions.<br/> The predicted performances and emissions were compared with the experimental results over the wide range of operating conditions.
유병철(B. C. Yoo),이건상(K. S. Lee) 한국정밀공학회 2005 한국정밀공학회 학술발표대회 논문집 Vol.2005 No.10월
Today recycling has been one of the most important issues in industry as it is required to save the limited amount of natural resources and to keep the environment green. In spite of many efforts to increase recycling rate in industry, however, the practical solutions are very limited. The difficulties are caused by the existence of many parts made of diverse materials and their inevitably complicated assembly structures to satisfy different needs. This paper represents a study on the disassembly sequence generator system for parts recycling. With disassembly costs and revenues, the optimum disassembly sequence can be found with a linear programming.