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[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
주병현(B. H. Joo),남기원(K. W. Nam),이병채(B. C. Lee ) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
We evaluate the durability of vehicle chassis component under dynamic loadings. Since the fatigue analysis of vehicle component is based on the dynamic load history it must be done by dynamic analysis. But in case the vehicle component has natural frequencies much larger than reversing frequencies of load history, we can get small analysis errors by applying quasi-static analysis. So it is inefficient that we apply to the dynamic analysis for all the vehicle components. In this research, we discuss the quasi-static analysis method which is appropriate for the fatigue analysis. And in case we can only perform the fatigue analysis based on dynamic analysis, we introduce more efficient method in the analysis time and hard disk storage.
매핑 알고리즘을 이용한 2.5차원 입체에 대한 육면체 요소망 자동 생성
최철현(C. H. Choi),채수원(S. W. Chae),권기연(K. Y. Kwon),이병채(B. C. Lee) 한국정밀공학회 2006 한국정밀공학회 학술발표대회 논문집 Vol.2006 No.5월
This paper proposes a hexahedral mesh generation scheme based on mapping approach and improves the drawback of sweeping algorithm. In order to improve the drawback, the algorithm in this paper generates hexahedral meshes by three dimensional element mapping first. Then hexahedral meshes are equivalent to geometry of the volume by mapping and smoothing. Sample meshes are constructed to demonstrate the mesh generating capability of the proposed algorithm.
이정준(J. J. Lee),주병현(B. H. Joo),이병채(B. C. Lee) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Generally, in case the natural frequency of vehicle components is larger than the reversing frequency of load history, we can obtain the analysis results with small errors. But in case of having the low natural frequency, we must avoidably carry out the dynamic analysis, and it requires much time and storage. Specially executing the fatigue analysis for vehicle components requires more time. To this end, it is not easy that we accomplish the optimization considering fatigue for the vehicle component based on the dynamic analysis. In this research we introduce an efficient method which performs the fatigue analysis based on the dynamic analysis. Finally as making the response surface we optimize the vehicle component under dynamic fatigue.
감성 완구 제작을 위한 아동들의 감성 분석 시스템 개발에 관한 연구
정기삼 ( K. S. Jung ),이병채 ( B. C. Lee ),하은호 ( E. H. Ha ),김동윤 ( D. Y. Kim ),김동선 ( D. S. Kim ) 한국감성과학회 2001 추계학술대회 Vol.2001 No.-
5∼7세 어린이 12명을 대상으로 생체 신호를 수집하여 기존의 생체 신호 처리 방법으로 감성을 추출하고 그 결과의 문제점을 보인다. 문제점들을 해결하기 위하여 Mental Stress를 측정하는 RRV, RPIAD 알고리듬을 적용하고 감성 완구에 적용 가능성 및 방법을 보인다. 이를 상품화할 수 있는 Affective Wearable 하드웨어를 설계하며 제안된 알고리즘과 하드웨어를 시험하고 검증하기 위한 Test Bed를 구성한다.
황토, 갯벌 및 머드의 중금속 흡착율에 관한 실험적 연구
이인숙(l.S.Lee),이미영(M.Y.Lee),이택중(T.J.Lee),김현정(H.J.Kim),이병창(B.C.Lee),정명상(M.S.Jeong),방은옥(E.O.Bang),송현실(H.S.Song),황혜경(H.K.Hwang),이중호(J.H.Lee),조영채(Y.C.Cho) 대한환경위생공학회 2004 대한환경위생공학회지 Vol.19 No.2
Yellow loess, Tidal plat sediment, and mud are known to be high in adsorption though they have great distinction according to the ratio of clay minerals content and their kinds. Thus one of the samples for this study can be obtained by drying of Yellow loess, Tidal plat sediment, and the mud which is semifinished products that are from the progress of heat treatment and making homogeneity which can be found everywhere in our country. Another sample can be prepared by reducing pollutants with the adsorbent and by burning heavy metals of their own. With the samples, noxious heavy metals such as Pb, Cd, and essential trace elements such as Cu, Fe, Mn by each concentration is tested for adsorption according to pH, the kinds of adsorbents and the amount of injection. With the help of these steps, this study shows that the adsorbents, which are green, reducing the additional pollution and low in price, can be found. It also shows that the optimal condition for removing pollutants can be found and the basic materials for treating water can be offered. The results were as follows;<br/> Yellow loess shows the rates of adsorption by more than 50% and Tidal plat sediment and Mud show it by more than 90%. Thus Tidal plat sediment and Mud are higher than Yellow loess the rates of adsorption.<br/> The pH should be treated in natural condition because the rates of adsorption of Pb, Cd, Cu, Mn excepting Fe in mud is higher in pH 7 than in pH 3 of Yellow loess, Tidal plat sediment, and Mud.<br/> The drying adsorbents are good to use because the rates of adsorption of heavy metals has tendency to be higher in the drying method than in the burning method.<br/> It is considered that the more the amount of the injection of the adsorbent is , the higher the rates of adsorption is, and one gram is reasonable for the amount of the injection of Tidal plat sediment and mud.<br/> Yellow loess is suitable for the treatment of the water that includes low concentration of heavy metals because it has the lower rate of adsorption as the concentration of noxious heavy metals is higher.<br/> It is thought that Tidal plat sediment and Mud is proper for the treatment of the water that includes high concentration of heavy metals because the rates of adsorption has not been changed as the concentration of heavy metals increases.