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多制約條件을 考慮한 P.C. 뼈대 構造物의 最適設計에 關한 硏究
李奎遠,李在永,盧旻來 전북대학교 공업기술연구소 1988 工學硏究 Vol.19 No.-
This study is on the optimum design of P.C. framed structures. A generalized for mulation for the optimum design of the P.C. framed structures under the combined beams and columns multi-constraints is presented as a SUMT programming problem using elastic analysis. The optimization of P.C. framed structures with multi-constraints is achieved by transforming the nonlinear programming problem with multi-constraints into SUMT, and solving SUMT utilizing the modified Newton-Raphson method. The objective functions are formulated as the cost function including the costs of steel, concrete and formworks for the minimum construction cost. The constraint equation are derived through considering of stress constraints, depth of neutral axis, sectional sizes, minimum steel ratio, and deflection constraints. The design problem is the allocation of member sizes from a catalog of commercially available sections in such a way as to minimized the prestressing force and the cost of a structure within the working stress constraints and deflection constraints. The algorithm adopted in this study is numerically tested for P.C. framed structures and compared with the result of the other algorithm to examine its applicability and stability. And, this optimization algorithm is introduced so that it can achieve as structural optimization carrying out simultaniously the analysis and the design of structure. 2bays-2stories of P.C. framed structure is selected as the structural model in order to examine the justification of this algorithm, and this algorithm is executed for the optimization of these selected structures and is investigated its applicability, convergency and tendency of optimization.
NMR study of distinct phase transitional behaviors in (CnH2n+1NH3)2SnCl6
이규원,이철의,최진영,김준 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.1
Phase transitions in bis-(n-CnH2n+1NH3)2SnCl6, where the hydrocarbon part is analogous to lipid membrane, were investigated by means of 200-MHz 1H nuclear magnetic resonance. As a result, critical uctuations and molecular dynamics associated with the phase transitions, an orderdisorder and a conformational phase transition, were distinguished in a wide temperature range. The critical dynamics, observed in the long-chain compounds but not in the short-chain compounds by laboratory frame spin-lattice relaxation measurements, is discussed in view of the chain length dependence of molecular dynamics.
Magnetic Moment in Proton-Irradiated Graphite
이규원,이철의,김인묵,Young-Ho Lee 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
In an attempt to understand the origin of the magnetic moment in proton-irradiated graphite,we have studied the proton irradiation effect in highly oriented pyrolytic graphite (HOPG). A lowdose irradiation induced Curie paramagnetism in HOPG, and the magnetic moment per irradiated proton was estimated to be 2.4μB.
李奎遠,李在永,盧旻來 전북대학교 공업기술연구소 1988 工學硏究 Vol.19 No.-
This is study on the optimum design of the box girder bridge using SUMT Method. The results of this study have been obtained by SUMT using Modified Newton-Raphson Method. SUMT using the Modified Newton-Raphson Method is considered as one of the most efficient and widely used optimization techniques in the structural optimization. The objective function is formulated as the total area of the structures. This study is devoted to the selection of the size of the cross section so that the area for the box girder bridge may be optimized. A computer programming is developed for the implementation of the above formulation. The summary of the results of this study is as follows. 1. It was to certify that the optimum algorithm of SUMT using the Modified Newton-Raphson Method had been reached to the optimum solution without oscillation to any box girder bridge. 2. The optimum solution of the algorithm which had applied to several box girder bridges in this study converged very rapidly within one iteration in most cases. 3. The applied algorithm will have a wide range of application to the box girder bridges because of the stable and efficient convergence.