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서순근(Sun Keun Seo),조호성(Ho Sung Cho) 대한설비관리학회 1996 대한설비관리학회지 Vol.1 No.1
N/A This paper is intended to be a comprehensive exposition for design of accelerated life tests(ALT's) for exponential lifetime distribution. Optimum ALT plans to minimize the asymptotic variance of maximum likelihood estimator of the logarithmic transformed
지수수명분포하에서 가변 스트레스 가속수명시험계획의 설계
조호성,서순근 대한설비관리학회 1998 대한설비관리학회지 Vol.3 No.1
This paper concerned with design of the time-varying stress accelerated life tests(ALTs). Accelerated life test plans are developed on the assumptions of exponential lifetime distribution, simple linear stress-parameter relationship, type I censoring and the cumulative exposure model for the effect of changing stresses as the following, i) the optimal progressive stress plans using two linear increasing rates with stress loading from a given condition including use stress level, ii) the optimal hybrid stress plans using one linear increasing rate with stress censoring, iii) the practical progressive stress plans using two linear increasing rate with stress censoring. Optimization criterion adopted is to minimize the asymptotic variance of the maximum likelihood estimator for the log mean lifetime at the use condition. The sensitivity analysis is also illustrate with a numerical example.