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Failure Rate Model of External Environment Maintenance for a System under Severe Environment  

Park, J.H. (Department of Industrial Engineering, Seoul National University)
Shin, Y.J. (National Information and Credit Evaluation, Inc.)
Lee, S.C. (Division of Industrial Systems Engineering, ERI, Gyeongsang National University)
Lie, C.H. (Department of Industrial Engineering, Seoul National University)
Publication Information
Journal of Korean Institute of Industrial Engineers / v.36, no.1, 2010 , pp. 69-77 More about this Journal
Abstract
The failure rate model of External Environment Maintenance(EEM) for a system under severe environment is investigated. EEM, which is recently introduced concept, is a maintenance activity controlling external environment factors that potentially cause system failure such as cleaning equipment, controlling temperature (humidity) and removing dust inside of electronic appliances. EEM can not have any influence on the inherent failure rate of a system but reduce the severity of the external environment causing failure since it deals with only external environment factors. Therefore, we propose two failure rate models to express the improvement effect of EEM: The intensity reduction model and age reduction model. The intensity and age reduction models of EEM are developed assuming the quality of improvement effect is proportioned to an extra intensity or age respectively. The validation of proposed failure rate models is performed in order of data generation, parameter estimation and test for goodness-of-fit.
Keywords
Failure rate; Maintenance; External Environment Maintenance(EEM); Intensity Reduction; Age reduction;
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