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혼합조정법(混合調整法)에 의한 평면(平面) 트러스 구조물(構造物)의 형상최적화(形狀最適化)에 관한 연구(硏究)
이규원,임정환,Lee, Gyu Won,Lim, Jeong Whan 대한토목학회 1991 대한토목학회논문집 Vol.11 No.1
본(本) 연구(硏究)에서는 트러스 구조물(構造物)의 형상(形狀)을 최적화(最適化)하기 위해서 혼합조정법(混合調整法)을 사용하였다. 첫째 단계(段階)에서는 Goal조정법(調整法)에 의해서 트러스 구조물(構造物)을 분할(分割)하여 최적화(最適化)를 실시함으로서 설계변수(設計變數) 및 제약조건(制約條件)식의 수(數)를 크게 줄일 수 있었다. 둘째 단계(段階)에서는 분할(分割)된 구조물(構造物)을 Model조정법(調整法)에 의해서 성질이 다른 설계변수(設計變數)를 분할(分割)하여 최적화(最適化)를 실시하므로서 효율적으로 해를 구하였다. 변위제약(變位制約)을 고려한 분할최적화(分割最適化)는 제약조건(制約條件)이 부분구조(部分構造)마다 독립(獨立)되어 있지 않기 때문에 Goal조정법(調整法)으로는 부분구조(部分構造)에 변위제약(變位制約)을 고려하기가 어려운 점이 있다. 따라서 본(本) 연구(硏究)에서는 변위제약(變位制約)만 고려한 전체문제(全體問題)에서 부분문제(部分問題)에 대한 변위분담율(變位分擔率)을 정하여 부분구조(部分構造)에 대한 최적화(最適化)를 실시하였다. 동일한 설계조건하(設計條件下)에서 트러스의 기하학적형상(幾何學的形狀)을 고정(固定)시키고 단면(斷面)만을 최적화(最適化)한 경우 보다 본(本) 연구(硏究)의 알고리즘에 의하여 트러스의 형상(形狀)까지도 최적화(最適化)한 경우 목적함수(目的函數)를 상당(相當)히 감소(減少)시킬 수 있었으며, 설계변수(設計變數) 및 제약조건식(制約條件式)의 수(數)를 크게 줄일 수 있었으므로 본(本) 연구(硏究)에 의한 트러스 구조물(構造物)의 형상최적화(形狀最適化)는 트러스 구조물(構造物)의 경제적(經濟的)인 설계(設計)에 도움을 줄 수 있을 것으로 사료(思料)된다. In this study, Mixed coordination method was selected to optimize the shape of the truss structures which takes multi-loading condition, allowable stress, buckling stress, displacement constraints into consideration. The structure was devided into substructures by Goal coordination method and the substructures were optimized by model coordination method which used two-level technique. Therefore the number of design variables and constrints can be decreased considerable. Under the condition of the same disign, the weight of truss structures can be decreased more considerable by means of optimizing even the shape of truss than by means of optimizing the section of truss while fixing geometrical configuration of it, even though there might be a little difference according to the early geomatrical shape of the truss and the design condition. Thus, the shape optimization of truss structures which utilize the results of this study can be helpful to the economical design of truss structures.
林貞煥,宋明燮,金在慶,金炳業,權五範 大邱敎育大學校 科學敎育硏究所 1987 과학·수학교육연구 Vol.11 No.-
Two subjects, Science teaching method and Study of the subject matters, are established to let students have the ability to teach the elementary science. It is an overwthelming view that Science teaching method course are merely divided into the above-mentioned two subjects by the elevation from the junior college to the senior one. But the authors discussed this theme on the junior college to the senior one. But the authors discussed this theme on the viewpoint that Study of the subject matters, newly established, is the result reflecting the significance of the elevation, not just the division of Science teaching method course inaugurated in the junior college period. The subject matters in the elementary school should include the fundamental concepts to attain the goal of the subject. That is, the subject matters should include the learning contents with the educational significance. Therefore, Study of the subject matters is defined as studying what these contents may signify educationally. From these points of view, Study of the subject matters is: 1) the study intended for the subject matters of the elementary school. That is ① what the fundamental concepts are, ② how they are related each other, ③ what their educational significance is. 2) to study the educational significance of the other subject contents. 3) a study for establishing the pertinent goal and selecting the subject matters to attain this goal when the educational conditions, such as the actual state and environment of children, are given. The authors discussed about article 1) in this paper.
林秉龍,林正換 군산대학교 1993 群山水産專門大學 硏究報告 Vol.28 No.1
This study is concerned with the minimum cost design of reinforced concrete retaining wall using strength design method. The constrained optimization problem is formulated in terms of seven design variables and sixteen constraints, with the material and construction cost as the objective function. The solution is derived by a feasible direction method using ADS. It is shown that the design variables are satisfied with all constraints and the design process are automatically treated by computer. Therefore, the minimum cost algorithm developed may be recommended to achieve the minimum cost design of reinforced concrete retaining wall.
分割技法에 의한 不靜定트러스 構造物의 最適設計에 關한 硏究
李奎遠,林正煥,房基成 전북대학교 공업기술연구소 1990 工學硏究 Vol.21 No.-
This study is concerned with optimum design of indeterminate truss structres by decompositive method. Decompositive optimization was selected to optimize the truss structures which take multi-loading conditions, allowable and buckling stress constraints into consideration. Tha algorithm of this study is made up of section optimization using feasible direction method. This optimization algorithm is introduced so that it can achive a structural optimization carring out simulatainously the analysis and the design of structures. So the ADS that is a fortran program for solution of nonlinear constrained optimization problems is applied to solve this problem There it can be concluded as follows: The optimization of truss structure which utiluzes the results of this study can be helpful to the economical design of truss structure.
幾何的計劃法에 依한 鐵筋콘크리트 橋의 最適設計에 關한 硏究
李奎遠,任正煥,柳熙仲 전북대학교 공업기술연구소 1987 工學硏究 Vol.18 No.-
This study is concerned with the optimum proportioning of reinforced concrete section for the minimum cost design of reinforced concrete structures using working stress design theory. This study is specifically intended to propose a formulation and solution method in order to obtain the optimum steel ratio and the optimum sizing of R.C. section such as the rectangular beam, slab, and T-beam section for the preliminary design of the R.C. slab system. The design constraints are the moment constraints, code constraints of minimum steel ratio and minimum depth of section and deflection. The minimum cost of design is obtained by considering the cost of steel, concrete, formworks and the cost of increasing the building height. the optimization is achived by using Geometric Programing Method.