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박동현,김동현,문형일,신하용,Park, Donghyun,Kim, Donghyun,Moon, Hyungil,Shin, Hayong 대한산업공학회 2016 대한산업공학회지 Vol.42 No.2
We propose a new approach to the stochastic version of Lanchester model. Commonly used approach to stochastic Lanchester model is through the Markov-chain method. The Markov-chain approach, however, is not appropriate to high dimensional heterogeneous force case because of large computational cost. In this paper, we propose an approximation method of stochastic Lanchester model. By matching the first and the second moments, the distribution of each unit strength can be approximated with multivariate normal distribution. We evaluate an approximation of discrete Markov-chain model by measuring Kullback-Leibler divergence. We confirmed high accuracy of approximation method, and also the accuracy and low computational cost are maintained under high dimensional heterogeneous force case.
자동차용 휠 베어링 시일의 설계를 위한 시일 립 변형해석
김헌영(Heonyoung Kim),문형일(Hyungil Moon),이창완(Changwan Lee),임종순(Jongsoon Lim),박지헌(Jihun Park),김영태(Youngtae Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Designing technology of bearing seal is closely connected with the efficiency and durability of whole bearing. So, if the efficiency of bearing seal is estimated and this estimation is used to the design, then we can produce the bearing seal that have better efficiency and durability The efficiency of bearing seal is strongly dependent on the shape of bearing seal lip. So if the designing factors of seal lip are determined, then optimized design of bearing seal can be conducted more efficiently. This study describes all the matters required for analysis using F.E.M. which is one of the methods for finding optimized design factors. The contents has been made up with the emphasis on seal lip modeling method and analysis process.