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저속 전기 자동차용 Steer-By-Wire 시스템 개발
박기두(Kidoo Park),김만호(Manho Kim),이경창(Kyungchang Lee),이석(Suk LEE) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
X-By-wire system is representative of new developed Idea in chassis of automotive vehicle. It is necessary for X-By-wire system to guarantee safety to vehicles in order to be applied. Safety in a system is achieved if a state transition to a failure state does not happen and the system operate within designed behavior after occurring fault In order to accomplish this safety, a system must be fault tolerant. Generally, if a system is fault tolerant, the system has redundant modules. In this paper, Steer-By-Wire system which is most representative system of X-By-Wire will be analyzed about fault cases and fault tree will be presented. On the basis of these results, probability of failure will be calculated at redundancy. In addition to, redundant algorithm will be showed and the system performance will be evaluated to prevent occurring transition to failure state.
목감천 복원설계를 위한 비정상성을 고려한 설계홍수량의 산정
이길성,오진호,박기두,성장현,Lee, Kil Seong,Oh, Jin-Ho,Park, Kidoo,Sung, Jang-Hyun 대한토목학회 2013 대한토목학회논문집 Vol.33 No.4
Lee et al. (2011)이 제시한 목감천 유역의 하천복원 설계절차에 근거하여 수리구조물의 설계와 관련 있는 설계홍수량을 산정에 있어 비정상성을 고려하여 산정하였다. 본 연구의 목적은 목감천 유역에서 비정상성을 고려한 새로운 설계홍수량을 제안하기 위함이다. 설계홍수량 산정방법인 설계-호우단위도법과 직접 홍수빈도해석법을 적용하였으며, 각각의 방법에 사용되는 빈도분석은 NCAR (National Center for Atmospheric Research)에서 개발된 extRemes 모형을 통하여 비정상성을 고려하였다. 직접 홍수빈도해석의 방법은 유량으로부터 직접 빈도해석을 수행한다는 점에서 신뢰성이 기대되지만, 설계-호우단위도법보다 다소 과소 추정되었다. 따라서 가장 크게 산정된 설계호우-단위도법의 100년 빈도 설계홍수량을 목감천 유역의 설계홍수량으로 결정하였다. The design flow considering nonstationarity is estimated to determine the design flood related to hydraulic structure quantitatively based on the design process for stream restoration in the Mokgamcheon watershed proposed by Lee et al. (2011). The purpose of this research is to suggest new ways that the design flood was calculated considering nonstationarity at the Mokgamcheon watershed. Storm-unit hydrograph method to calculate design flood and direct frequency analysis were applied and nonstationarity was considered for the frequency analysis through extRemes toolkit developed at NCAR (National Center for Atmospheric Research). Although the method of direct flood frequency analysis due to dealing with flowrates directly has a more reliable than strom-unit hydrograph method, as a result, the method of direct flood frequency analysis underestimated the design flood than strom-unit hydrograph method due to the characteristics of the flow data. Therefore, the flood of storm-unit hydrograph method (100 years frequency) was determined as the design flood in the Mokgamcheon watershed.
저속 전기 자동차용 Steer-By-Wire 테스트 시스템 개발
임창휘(Changhwy Lim),박기두(Kidoo Park),김만호(Manho Kim),이경창(Kyungchang Lee),이석(Suk Lee) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
X-By-Wire system is representative of new developed idea in chassis of automotive vehicle. It is necessary for X-By-Wire system to guarantee safety to vehicles in order to be applied. Safety in a system is achieved if a state transition to a failure state does not happen and the system operate within designed behavior after occurring fault In order to accomplish this safety, a system must be fault tolerant. Generally, if a system is fault tolerant, the system has redundant modules. In this paper, Steer-By-Wire system which is most representative system of X-By-Wire will be analyzed about fault cases and fault tree wiII be presented. On the basis of these results, probability of failure wiII be calculated at redundancy. In addition to, redundant algorithm will be showed and the system performance will be evaluated to prevent occurring transition to failure state.