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비선형 유한요소해석 프로그램을 이용한 차체 구조물의 동강성 및 정강성 해석
김성현(Sunghyun Kim),김형일(Hyungil Kim),변형배(Hyungbai Byun),김동석(Dongseok Kim),이용훈(Yonghoon Lee),김일환(Ilhwan Kim),허승진(Seung Jin Heo),임홍재(Hong Jae Yim) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this study, dynamic stiffness analysis and static stiffness analysis were conducted by using nonlinear finite element analysis program and linear finite element analysis respectively to compare the results and to confirm reliability about results of nonlinear finite element analysis program. First, dynamic stiffness analysis has been performed on side out panel, crash box, sub-frame and BIW(Body In White) that has been connected with front bumper, rear bumper and sub-frame. Second, static stiffness analysis has been conducted on crash box and hood that has been modeled with spot weld elements and rigid body elements. Consequently, differences of dynamic and static stiffness analysis results through nonlinear finite element analysis program and linear finite element analysis were below 6 % but difference was more than 6 % as to dynamic stiffness of BIW.
김성현(Sunghyun Kim),임현기(Hyunki Lim),박준용(Junyong Park),최창원(Changwon Choi),이준환(Joonhwan Yi) 대한전자공학회 2015 대한전자공학회 학술대회 Vol.2015 No.11
The hardware device with DMA(direct memory access) function has been increased in embedded systems. Therefore, importance of synchronization has increased between the cache memory and main memory. To synchronize between the cache and main memory, we uses cache flush. So in this paper, we propose the cache which has selective cache flush that can perform cache flush not only whole region of memory but also the region set by processor. In the experiments, overall performance is improved about 1.2 times compared to the case original cache flush.
분산전원시스템에 적합한 에너지 저장장치의 급속충전에 관한 연구
김성현(Kim Sunghyun),안상용(Sang Yong An),안창덕(Chang Doeuk An),윤영삼(Young Sam Yoon) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
본 논문에서는 분산전원시스템의 에너지 저장장치로 널리 사용되는 Lead-Acid 배터리에 대한 특성을 나타내었다. 기존의 정전류-정전압 충전과 Step-Down 정전류 충전의 비교 실험을 통해 Step-Down 정전류 충전 시 가스발생을 최소화하고 급속충전이 가능함을 나타내었다.