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지수수명분포에 대한 가속수명시험 샘플링검사방식의 설계: 제II종 관측중단의 경우
전영록,Chun, Young Rok 한국품질경영학회 1995 품질경영학회지 Vol.23 No.4
This paper considers the design of life test sampling plans based on Type II censored accelerated life tests. The lifetime distribution of products is assumed to be exponential. An estimator of acceleration factor between use condition stress and an accelerated level of stress higher than use condition stress is assumed to be known. The critical value for lot acceptance and the number of failure before censoring which satisfy the producer's and consumer's risk requirements are determined. The properties of the proposed life test sampling plans are investigated.
전영록 ( Young Rok Chun ),김경환 ( Kyung Hwan Kim ) 대한설비관리학회 2002 대한설비관리학회지 Vol.7 No.4
N/A This study considers design of reliability acceptance sampling plan (R4SP) for m life qualification at selected confidence level. The lifetime distribution of product is assumed to be Weibull with known shape parameter. MIL - STD - 690 C and KS C 6032 standards offer acceptance number and total testing time to decide failure rate level of product for exponential lifetime distribution. For given number of test items and acceptance number, testing time to decide mean life level of product at selected confidence level is derived. The levels of mean life and tables of testing time for given mean life level are suggested.
평균 출검 고장률을 고려한 고장률 시험방법에 대한 연구
전영록 ( Young Rok Chun ) 대한설비관리학회 2002 대한설비관리학회지 Vol.7 No.3
N/A This study considers design of reliability acceptance sampling plan (RASP) for failure rate qualification at selected confidence level. The lifetime distribution of product is assumed to be exponential. MIL - STD - 690 C and KS C 6032 standards provide this procedure. These standard offer acceptance number and total testing time to decide failure rate level of product. But selection method of acceptance number is not presenting. Average outgoing failure rate (AOFR) which is long-term average of failure rate of accepted product is very important in side of reliability assurance of products. Formula for computing AOFR is derived and a method of design a RASP which satisfies AOFR`s limit requirement is proposed. Additionally, a selection method of acceptance number considering total testing cost and reliability assurance cost at the same time is also suggested.