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신뢰성지수를 고려한 합성 뼈대구조물의 최적설계에 관한 연구
정영채,김종길,Jung, Young Chae,Kim, Jong Gil 한국강구조학회 2003 韓國鋼構造學會 論文集 Vol.15 No.4
본 연구의 목적은 H형강 단면과 콘크리트의 합성단면으로 구성된 보와 기둥의 합성 뼈대구조물에 대해 신뢰성지수를 고려한 최적 단면을 설계할 수 있는 알고리즘을 개발하는데 있다. 합성 뼈대구조물의 최적화 문제는 단면 치수를 설계변수로 취하고 목적함수와 제약조건을 형성한다. 목적함수는 구조물의 총 경비로 형성하고, 제약조건식은 단면응력과 허용응력의 신뢰성지수를 고려하여 유도한다. 합성 뼈대구조물의 단문을 최적화하는 알고리즘은 수정 Newton-Raphson 탐사법을 사용하는 SUMT기법을 사용한다. 본 연구에서 개발된 최적화 알고리즘은 1층 1경간 합성 뼈대구조물과 5층 1경간 합성 뼈대구조물의 수치예에 신뢰성지수(${\beta}=3.0$, ${\beta}=0.0$)를 고려한 합성 뼈대구조물 설계의 실용화를 위하여 적용된다. 제안된 알고리즘의 최적화 가능성과 적용성 그리고 수렴성 등을 살펴보기 위하여 수치결과들을 비교 분석한다. The purpose of this study is to develop an algorithm, which can be designed the optimal sections of the composite framed structures constituted with the beams and the columns consisted of H type of steel section and concrete considering the reliability index. The optimized problem or the composite framed structures is formulated with the objective function and the constraints taking the section sizes as the design variables. The objective functions are constituted by the total costs of constructions. Also, the constraints are derived by considering the reliability index of section stress and allowable stress. The algorithm optimized the section of the composite framed structures utilizes the SUMT method using the modified Newton-Raphson direction method. The optimizing algorithm developed in this study is applied to the numerical examples with respecting a one-bay, one-story composite framed structure and a one-bay five-story one for the practical utilization of design on the composite framed structures using the reliability indices$({\beta})$ three and zero. In addition, their numerical results are compared and analyzed to examine the possibility of optimization the applicability, and the convergence this algorithm.
하수체척출 흰쥐에 있어서 성Hormone 의 투여가 갑상선에 미치는 영향
정영채,이규승,김관영 ( Y . C . Chung,K . S . Lee,K . Y . Kim ) 한국축산학회 1974 한국축산학회지 Vol.16 No.2
The study was made to investigate whether there would be any direct relationship between. sexual gland and thyroid gland without the control mechanism from the hypophysis. After the administration of sex hormone to the albino rats (hexosterol to female and testosterone propionate to male), weights of thyroid glances, the uptake rate of radioactive iodine-131 (^(131)I) and histological changes were measured from the 1st day to 56th day cf the experimental period. The results obtained were as fo[lows; 1. For the weight changes cf thyroid gland, it shoved a similar changes between the hypophysectomized group and the sex hormone treated-hypophysectomized group. There were no sexual differences among the groups. However, the weights of thyroid gland for the treatment groups mere decreased as the time passed as compared to the control group, and the differences were highly significant at the 7th day and there on. 2. For the uptake rates of radioisotope-^(131)I the changes were similar between both sexes, but were decreased rapidly as time passed. The differences were significant at the first day and highly significant at the 7th day and there on for the hypophysectomized group. The changes for the sex hormone treated-hypophysectomized group were also similar to the hypophysectomized group. 3. In the histological changes of the thyroid gland, there mere no sexual differences among the groups. However, there were similar changes in both hypophysectomized groups and sex hormone treated-hypophysectomized group, showing slight squamous sign in follicular epithelial cells at the 7th day, but considerable degree of squamousl sign accompained with pyknosis of the cell and irregular enlargement of the follicles at the 14th day following the treatment. At the 28th day, it seemed that the degeneration was much progressed, and at the 43nd and 56th day, it showed karyorrhectic sign of follicular epithelial roils and therefore the loss of secretory function, histologically. 4. Since there were no differences in weight changes of thyroid gland, the uptake rates of radioisotope-^(131)I and histological change between the hypophysectomized and sex hormone treated-hypophysectomized groups, it would appear that there were no direct relationship between the sexual gland and the Thyroid gland. but the involvement of hypophysis might be necessary for the control mechanism.