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최덕기,김창수,Choi, Deok-Kee,Kim, Chang-Soo 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.9
This paper addresses method which can be used for analyzing thermal stresses of a functionally graded material(FGM) using semi-analytical approach. FGM is a nonhomogeneous material whose composition changes continuously from a metal surface to a ceramic surface. An infinite one dimensional FGM plate is considered. The temperature distribution in the FGM is obtained by approximate Green's function solution. To expedite the convergence of the solutions, alternative Green's function solution is derived and shows good agreement with results from finite difference method. Thermal stresses are calculated using temperature distribution of the plate.
최덕기,김창수,Choi, Deok-Kee,Kim, Chang-Soo 대한기계학회 1998 大韓機械學會論文集A Vol.22 No.1
This paper addresses a method which can be used for analyzing thermal stresses of a functionally graded material(FGM) using semi-analytical approach. FGM is a nonhomogeneous material whose composition is changed continuously from a metal surface to a ceramic surface. An infinite one dimensional FGM plate is considered. The temperature distribution in the FGM is obtained by approximate Green's function solution. To expedite the convergence of the solutions, alternative Green's function solution is derived and shows good agreement with results from finite difference method. Thermal stresses are calculated using temperature distribution of the plate.
최덕기 대한의용생체공학회 2016 Biomedical Engineering Letters (BMEL) Vol.6 No.3
Purpose To illustrate a systematic procedure for mechanicalcharacterization or mechanical behavior of biological tissueswith a semi-empirical method based on mathematical models. Methods The method is composed of a series of procedures:construction of cell elements on the specimen, imageprocessing, continuum mechanics, hyperelasticity and so on. An element used in the method, which is similar to finiteelement methods, is defined by placing markers on thespecimen. The change of the locations of the element duringa motion is monitored to calculate the displacement for stressestimation owing to external impacts or forces. Results The validity of the method for mechanicalcharacterization or mechanical behavior of biological tissuesis shown through material test simulations with mathematicalmodels, resulting in good agreement overall. Conclusions A general review of mathematical modeling ofbiological tissues is served and a semi-empirical method,which makes good use of both finite element methods andmathematical models based on the phenomenologicalmodeling technique, is introduced to assess the stress-strainresponses of biological tissues subjected mechanical loadings.
분자 동역학 방식을 사용한 전역 최적화 기법에 관한 연구
최덕기,김재윤,Choi, Deok-Kee,Kim, Jae-Yoon 대한기계학회 1999 大韓機械學會論文集A Vol.23 No.7
This paper addresses a novel optimization technique based on molecular dynamics simulation which has been utilized for physical model simulation at various disciplines. In this study, objective functions are considered to be potential functions, which depict molecular interactions. Comparisons of typical optimization method such as the steepest descent and the present method for several test functions are made. The present method shows applicability and stability in finding a global optimum.