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배철,김병수,Bae, C.,Kim, B.S. 대한영상의학회 1977 대한영상의학회지 Vol.13 No.1
There were a number of factors which influenced bone maturation and recently, the patterns and sequence of the times of ossifications were not similar with previous reports. So the author studied statistically the bone age of total 1092 children, by the roentgenograms of wrist, elbow, and foot, who had visited B.N.U. Hospital during 5 years dating from March, 1971 to March, 1976. The results obtained are summarized as follows: 1. The numbers of children, aged from 5 to 8 years old, were 853(80.2%) among total 1092 cases. The ratio between male and female children was about 1 : 1. 2. Some variations were observed in the time of appearance of each carpal bone in these age groups, but constantly visualized bones were capitate, hamate, triangular bones. 3. As compared with previous reports in Korea, 3-4 months were shortened at the view points of carpal bone ossification. But still noted delayed visualization as compared with that of American children more than one year. 4. The ag difference between chronological and bone age became pronounced as growing old in this age groups. 5. The sex difference of the time of appearance of ossification centers was less pronounced as compared with previous reports.
Predictor-Corrector를 활용한 외부 유동장 격자 생생 기법
김병수(B. S. Kim) 한국전산유체공학회 1997 한국전산유체공학회지 Vol.2 No.1
In this paper a new structured grid generation technique is introduced. This new technique utilizes predictor-corrector approach, and is a marching scheme in the global sense as the hyperbolic scheme is. In the predictor step, one layer of grid cells is obtained by using Modified Advancing Front Method which generates a collection of quadrilateral cells simultaneously. In the corrector step, the layer of grid cells that is calculated in the predictor step is adjusted by solving Laplace equations to prevent grid lines from skewing and overlapping in highly curved configurations. It is shown that the resultant algorithm, named a MAP scheme, which combines the Modified Advancing Front Method as a Predictor with an elliptic scheme as a corrector can be used to generate globally smooth and locally near-orthogonal grids for external flow fields even for highly curved configurations. Examples of grid generations for external flow fields about several configurations by use of the present approach are given, and its applicability and flexibility have been demonstrated and discussed.
종속 사이클을 갖는 복수 변수들의 자료 종속성 제거에 관한 연구
김병수(B S. Kim),박두순(D.S. Park),백두권(D K. Baik),황종선(C.S. Hwang) 한국정보과학회 1990 한국정보과학회 학술발표논문집 Vol.17 No.2
본 논문에서는 많은 내재된 병렬성을 가지고 있는 순자 프로그램을 병렬 처리 시스템에서 수행 가능한 병렬 처리 형태로 변환하는 기법들을 제시하였다. 기존의 cycle shrinking 기법[3]은 increment factor를 이용하여 단일 변수에 대한 병렬성 성능의 향상을 꾀하였으나, 여기에서는 종속 사이클을 가지는 단일 변수에 대해서는 기존의 cycle shrinking 방법보다 효율적인 방법을 제시하였고, 일반적인 n 개의 변수들에 대해서는 병렬성을 추출하는 "dependence removing"이라는 프로그램 재구조화 기법을 제시하였다.
구름마찰접촉하중 시Polyethylene tibia 요소의 표면균열 복합전파 거동에 관한 연구
김병수(B.S. Kim),문병영(B.Y. Moon) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Pitting wear is a dominant form of polyethylene surface damage in total knee replacements, and may<br/> originate from surface cracks that propagate under repeated tribological contact. In this study, stress intensity<br/> factors, I K and II K , were calculated for a surface crack in a polyethylene . CoCr . bone system under the<br/> rolling and/or sliding contact pressures. Crack length and load location were considered in determination of<br/> probable crack propagation mechanisms and fracture modes. Positive I K values were obtained for shorter<br/> cracks in rolling contact and for all crack lengths when the sliding load was apart from the crack. II K was<br/> the greatest when the load was directly adjacent to the crack (g/a=..1). Sliding friction caused a substantial<br/> increase of both max<br/> I K and max<br/> II K . The effective Mode I stress intensity factors, eff K , were the greatest at<br/> g/a=..1, showing the significance of high shear stresses generated by loads adjacent to surface cracks. Such<br/> behavior of eff K suggests mechanisms for surface pitting by which surface cracks may propagate along their<br/> original plane under repeated rolling or sliding contact.