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이병채(BC Lee),김동성(DS Kim),권병일(BI Kwon) 대한산부인과학회 1964 Obstetrics & Gynecology Science Vol.7 No.1
1. 재탈 40주의 여성 신생아둔부기형종의 1예를 조직학적 검색과 아울러 보고함. 2. 종양에 의하여 분만장애를 가져와 술자의 강력견인과 종유의 파열로서 태아만출을 완료하였다. 3. 분만장애로 분만제2기가 약 9시간이나 경과하였으나 인접장기의 손상은 없었으며 아무런 후유증이 없었다. A case of teratoma on gluteal region of female infant is reported, and a brief review on the literature is made.
이병채,황선철,이명호,Lee, Byung-Chae,Hwang, Seon-Cheol,Lee, Myoung-Ho 대한의용생체공학회 1990 의공학회지 Vol.11 No.1
In this paper, fast Fourier transform and fast Walsh transform algorithm are studied for ECG data compression. ECG data-12 bit samples digitized at 480 samples-are segmented into QRS complexes and 50 intervals by di%ital derivative filter, which used for detection of QS width and difrerenre compressed in Fourler or welsh domain. And also the existing techniques for data compression-TP, MTP, CORTES, AZTEC, MCORTES, which have not been evaluated with a common measurement of goodness, were processed to get absolute terms of values in the same condition.
좌굴을 고려한 적층 복합재 구조의 강건 최적설계에 관한 연구
이병채,이정준,정도현,Lee, Byeong-Chae,Lee, Jeong-Jun,Jeong, Do-Hyeon 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.9
A robust optimization procedure is applied to determine the design of the laminated composite plates with buckling constraints. In order to investigate the variation effect to the whole performance of a structure, both design variables and system parameters are assumed as random variables about their nominal values. The robust optimization method has advantages that the mean value and the variation of the performance function are controlled simultaneously and the second order sensitivity information is not required. Considering the information of uncertainty, robust optima for the buckling load of the laminated composite plates with cut-out is obtained. The robustness of the structures is compared to that of the deterministic optimization using scaling factors.
이병채(Byung-Chae Lee),유선국(Sun-Kook Yoo),김혜진(Hye-Jin Kim) 대한전자공학회 2013 전자공학회논문지 Vol.50 No.11
집중에 관한 뇌파 해석은 인간의 인지 이해에 기본적인 요소이다. 본 연구에서는 시각자극에 대한 뇌의 집중, 비집중 상태의 차이특성을 비선형 분석하였다. 적은 샘플 데이터와 시간에 따른 변화특성을 해석하기 위하여 반복 정량 분석 법을 사용하였으며, 자극에 동기된 유발 전위의 반복궤적, 색상 반복 궤적을 도식화하였으며, 비선형 특징 파라미터들의 평균특징과 시변특성을 추출하였다. 집중-비집중 도식과 파라미터 쌍은 위상공간 변환의 차원과 시간 지연을 결정하기 위한 정보를 제공하였으며, 집중 시의 뇌가 비집중 시의 뇌보다 복잡하다는 특징을 보였으며, 자극에 동기된 유발전위는 평균적 의미에서 동일 반응을 보이나 국부적으로는 환경과 상태에 따라 변화하였다. 본 실험을 통하여 시각자극에 대한 집중과 비집중 시 뇌의 비선형 현상을 해석하기 위한 가능성을 확인하였다. The analysis of electroencephalographic signal associated with the attention is essential for the understanding of human cognition. In this paper, the characteristic differences between the attention and inattention status in the brain were inspected by nonlinear analysis. The recurrence quantification analysis was applied to the relatively small number of samples of evoked potential having time varying characteristics, where the recurrence plot (RP), the color recurrence plot (CRP), and mean and time-sequential trend parameters were extracted. The dimension and the time delay in phase transformation can be determined by the paired set of extracted parameters. It is observed from RP, CRP, and parameters that the brain dynamics in attention is more complex than that in the inattention, as well as the synchronized brain response is stable in the mean sense but locally time varying. It is feasible that the non-linear analysis method can be useful for the analysis of complex brain dynamics associated during visual attentional task.
덮개 함수를 이용한 제한 조건 누적 최적화 기법에 관한 연구
이병채,이정준,Lee, Byeong-Chae,Lee, Jeong-Jun 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.4
Automated design of large structures requires efficient and accurate optimization algorithms because of a large number of design variables and design constraints. The objective of this study is to examine the characteristics of the Kreisselmeier -Steinhauser envelope function and to investigate va tidily of accumulating constraint functions into a small number of constraint functions or even into a single constraint function. The commercial package DOT is adopted as a local optimizer. The optimum results using the envelope function are compared with those of the conventional method for a number of numerical examples and the differences between them are shown to be negligible.
[論文] 비선형 회전 스프링 요소를 갖는 공간 프레임의 구조의 비선형 해석에 관한 연구
이병채(B.C.Lee),박문식(M.S.Park) 한국자동차공학회 1990 오토저널 Vol.12 No.2
Three dimensional frame structures with such nonlinearities as large displacements, medium rotations, plastic hinges and local defects are efficiently analyzed by introducing the nonlinear rotational spring. Formulations are based on the incremental updated Lagrangian descriptions and the virtual work principle. Axial displacement and twisted angle in beam elements are interpolated linearly, while bending displacements are approximated by the Hermite polynomials. The modified arc length method is used as a solution method. The moment - angle of rotation relationship obtained analytically or experimentally can be easily incorporated into the solution procedure. Several examples tested show that the present method can be used efficiently in analyzing nonlinear frame structures with plastic hinges or