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하부 구성품의 신뢰도 특성을 고려한 복합 시스템의 최적 예방정비 주기 산출
이연호(Youn-ho Le),이익도(Ik-Do Lee),이동우(Dong-Woo Lee),손기홍(Ki-Hong Sohn) 대한산업공학회 2011 대한산업공학회지 Vol.37 No.4
Generally, the life-cycle cost of complex systems composed of several sub systems or equipments such as train, aircraft, weapon systems is spent much more during operation and maintenance phase than development phase. The maintenance cost for maintaining the availability and extending the life span of systems comprise a large proportion of systems operation cost. The cycle of preventive maintenance affects operation and maintenance cost a lot. In this study, we introduce a way minimizing life-cycle cost of systems by calculating more reliable preventive maintenance period than the results of previous study, using systems reliability data considered the reliability and failure effect ratio of sub-systems or components. We can solve the preventive maintenance period problem, known as NP-Hard, as quick as possible by using modified genetic algorithm than using other models introduced in previous study.
베이지안 기법을 적용한 일회성 장비의 경제적 시험 수량 연구
이연호(Youn Ho Lee),이계신(Kye Shin Lee),이학재(Hak Jae Lee),김상문(Sang Moon Kim),문기성(Ki Sung Moon) 한국신뢰성학회 2014 신뢰성응용연구 Vol.14 No.3
This paper discusses the application of Bayesian techniques with test data on similar products for performing the Economical Reliability Test of new one-shot device. Using the test data on similar products, reliability test required lower sample size currently being spent in order to demonstrate a target reliability with a specified confidence level. Furthermore, lower sample size reduces cost, time and various resources on reliability test. In this paper, we use similarity as calculating weight of similar products and analyze similarity between new and similar product for comparison of the essential function.
중복설계 및 예방정비를 고려한 수리가능 k-out-of-n 시스템 신뢰도 최적화 전략
이연호(Youn-ho Lee),정광균(Kwang-kyun Jung),윤태동(Tae-dong Yoon),권기상(Ki-sang Kwon) 대한산업공학회 2014 대한산업공학회지 Vol.40 No.1
The configuration such as series, parallel and k-out-of-n of a repairable system directly affects its reliability. The maintenance strategy can also affect the overall performance of the system. The objective of this work is to investigate the possible trade-off between the configuration of a repairable k-out-of-n system and its maintenance strategy. The redundancy is considered to be the design decision variables, whereas the preventive maintenance period is considered to be the maintenance decision variables. The optimization model is used to minimize the overall life cycle cost associated with the system, considering constraint on reliability. Finally, genetic algorithm is used to find the optimal values for the decision variables. The result is compared with optimal values for considering redundancy and maintenance respectively.
이계신,이연호,조용석,김효창,김상문,Lee, Kye-Shin,Lee, Youn-Ho,Cho, Yong-Seok,Kim, Hyo-Chang,Kim, Sang-Moon 한국시뮬레이션학회 2011 한국시뮬레이션학회 논문지 Vol.20 No.4
장시간 저장 후 짧은 시간 동안 운용되는 특성을 갖는 보증 유도탄은 지속적인 신뢰도 저하를 개선하기 위해 주기적인 검사정책을 사용한다. 본 연구에서는 유도탄의 저장 신뢰도 유지를 위해 주기적 검사 개념을 기초로 검사장비의 불완전성에 따라 유도탄 구성품을 정비계단에 맞추어 분류하고, 검사 시 발생하는 손상확률과 정비과정의 불완전성에 의해 손상되는 확률을 고려하여 최적의 검사주기 산출과정을 제시한 기존 연구를 검토한다. 또한 검토된 기존 연구를 바탕으로 주기검사 과정에서 유도탄이 손상되는 확률과 유도탄의 운용 형태 및 정비 형태를 고려한 제약사항을 포함하는 시뮬레이션 모델을 설정하고, 시뮬레이션 전용 패키지를 활용하여 분석함으로써 실제 운용 환경에서 최적의 보증유도탄 검사주기, 주기검사소, 정비창을 설정함으로써 유사 유도탄체계에서 활용이 가능한 시뮬레이션모델을 제안한다. Certified Missile Round Concepts that is one-shot device use the periodic inspection policy to improve the continuously deteriorated reliability. In this paper, we suggest dormant reliability prediction model by simulation with real operational environment. The suggested prediction model is based on optimal inspection period decision model and additionally considers various constraints; moving, inspection or repair service time. The simulation results show the constraints affect dormant reliability and missile availability. Lastly, we suggest building up a depot to resolve the above problems by the suggested simulation model.