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동시 경화 제작기법을 적용한 이종 수지 복합재의 열적/기계적 특성에 관한 실험적 연구
윤진영,최지덕,박철용,김영규,Yoon, Jin-Young,Choi, Jiduck,Park, Cheolyong,Kim, Younggyu 한국군사과학기술학회 2020 한국군사과학기술학회지 Vol.23 No.5
Individual curing process of each layer in two resin composites can be caused the separation between two layers. In this study, co-curing process for two resin composites is suggested to improve the inter-layer bonding. Glass fiber reinforced composites with phenolic and epoxy resins were manufactured by co-curing process, and several types of glass/phenolic composites were considered to confirm the application on two resin composites. Experiments for smoke resistance, scratch resistance and flexural strength were carried out to verify requirements corresponding to thermal and mechanical environments. It was validated that two resin composites with phenolic resin impregnated prepreg exhibits good thermal and mechanical characteristics, and it can serve as highly effective composite structures in aerospace and many industry areas.
반복법을 통한 병렬 유한요소 해석 시 로드 밸런싱 성능 향상
이창성(Chang Sung Lee),최지덕(Ji Duck Choi),김승조(Seung Jo Kim) 한국항공우주학회 2004 韓國航空宇宙學會誌 Vol.32 No.2
본 연구에서는 유한요소 구조해석의 로드밸런싱에 활용될 수 있는 그래프 분할 기법을 이용한 I-WEVM기법을 제안하였다 유한요소 메쉬 데이터를 그래프 구조로 변환하는 기법인 I-WEVM기법은 초기 영역분할 결과에서 전체 경계면의 절점 수와 경계면 절점 수의 최대값과 최소값의 차이가 줄어들도록 꼭지점 가중치를 변경하면서 반복적으로 영역 분할을 수행하여 보다 더 우수한 영역분할 결과를 얻는 방법이다. 다양한 구조해석 예제를 통해서 WEVM, WEM 기법과의 비교를 통해 병렬처리 시의 성능향상을 검증하였으며, 영역별 요구 메모리량, 배정도 실수 데이터 통신량 등도 살펴보았다. In this work, a new mesh-partitioning scheme, I-WEVM(Iterative Weighted Edge and Vertex Method) which can be utilized for the load balancing of parallel finite element analysis was proposed. I-WEVM is a kind of graph-mapping scheme for converting a finite element mesh to a graph structure. In I-WEVM, the mesh-partitioning process was conducted iteratively until the total number of boundary nodes and the difference of the maximum and minimum number of boundary nodes were decreased simultaneously. The required memory size distributions and parallel performances were investigated to compare I-WEVM with WEVM and WEM(Weighted Edge Method) through the several numerical examples. And the floating-point operations and the total communication of double-precision variables were also checked up.
REALIZATION OF INTERNET PARALLEL SUPERCOMPUTING FOR LARGE-SCALE STRUCTRAL ANALYSIS
Kim, Seung Jo,Lee, Chang Sung,Ha, Byung Un,Choi, Ji Duck,Cho, Jin Yeon,Kim, Jeong Ho 서울대학교 항공우주신기술연구소 2001 항공우주신기술연구소 연구보고 Vol.2 No.2
In this work, Internet Supercomputing methodology is introduced and the concept is materialized for large-scale finite element analysis. The primary resources of Internet Supercomputing are numerous idling PCs connected by Internet with no regards to their locations. Under the above concept, virtual supercomputing system InterSup I is constructed and tested. To establish the InterSup I system, 64 PC nodes, which are located in several places and connected by Internet, are conscripted, and the finite element code, IPSAP(Internet Parallel Structural Analysis Program) based on parallel multifrontal solver is developed for solving structural analysis problems. And mesh-partitioner based on graph-partitioning algorithms with WVEM(Weight Vertex and Edge Method) proposed in this work also developed. By the establish InterSup I system, analysis of finite element structural model having around 10 million DOFs are solved and the elapse time is 28,194 sec. From these results, it is confirmed that the proposed Internet Supercomputing methodology has a great promise and potential as a next-generation.