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Zero Defective 품질보증을 위한 선별시험 설계
권영일 청주대학교 산업과학연구소 2000 産業科學硏究 Vol.18 No.1
Reliability screening procedures guaranteeing zero defective outgoing quality are developed. We consider a situation where defective products have short lifetimes and non-defective ones never fail during the technological life of the products. Sequential screening procedures are developed which guarantee with high confidence that the number of remaining defective products is zero when the screening test is terminated. Numerical examples are provided.
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AISI 316 스테인리스강의 크리프-피로 상호작용시 수명예측에 관한 연구
권영일,김범준,임병수 成均館大學校 科學技術硏究所 2000 論文集 Vol.51 No.2
The effect of tensile hold time on the creep-fatigue interaction in AISI 316 stainless steel was investigated. To study the fatigue characteristics of the material, strain controlled low cycle fatigue(LCF) tests were carried out under the continuous triangular waveshape with three different total strain ranges of 1.0%, 1.5%, and 2.0%. To study the creep-fatigue interaction, 5 min., 10 min., and 30 min. of tensile hold times were applied to the continuous triangular waveshape with the same three total strain ranges. The creep-fatigue life was found to be the longest when the 5 min. tensile hold time was applied and was the shortest when the 30 min. tensile hold time was applied. The cause for the shortest creep-fatigue life under the 30 min. tensile hold time is believed to be the effect of the increased creep damage per cycle as the hold time increases. Under the total strain range of 1%, significant reduction in life was observed as the tensile hold time was increased compared to the result of 2% total strain range. The theoretical prediction obtained by the Modified Coffin-Manson method and the experimental results of creep-fatigue life were found to be in resonable agreement with each other.
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권영일 청주대학교 2016 産業科學硏究 Vol.33 No.2
Economic maintenance policies for repairable systems subject to performance deterioration are proposed. A cost model including repair and replacement costs and the earning loss due to deterioration is developed for repairable systems with Power Law non-homogeneous Poisson process. Optimal replacement policies that minimize average cost of maintaining system are derived and numerical examples are provided to illustrate the use of the proposed maintenance policies.
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권영일 청주대학교 2012 産業科學硏究 Vol.30 No.1
Reliability allocation is one of the important activities in the design and development of a system or product and an effective reliability allocation method is needed to allocate system level reliability requirements into subsystem or component level. In this paper, a new reliability allocation method for mechanical equipment is proposed. The new method comprises typical reliability allocation criteria in the literature and provide a comprehensive reliability allocation method appropriate for mechanical equipment. A reliability allocation example for excavator is provided for illustrating the allocation process of the proposed method.
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권영일,한인수 청주대학교 산업과학연구소 2005 産業科學硏究 Vol.22 No.3
In this paper, accelerated life testing(ALT) method and procedures for a are developed and applied to assess the reliability of the product. Relay is a device that can open and close the electric circuit electrically and is used for protecting and controlling the load. In this study, an accelerated life test method for predicting the mechanical life of a relay is developed using the relationship between stresses, failure mechanism and life characteristics of products. Using the ALT method, we performed life tests and analyzed the tests results. The proposed method and procedures may de extended and applied to testing similar kinds of products to reduce test times and costs of the tests remarkably.
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권영일,김태수 청주대학교 산업과학연구소 1997 産業科學硏究 Vol.15 No.-
In this paper, characteristics and properties of the international quality management standard (ISO 9000) and environmental management standard (ISO 14000) are examined. Expected benefits from gaming ISO 9000 and ISO 14000 certifications are evaluated and some problems in operating both the quality and environmental systems in enterprises are investigated. An integration of the two management systems in an organization is also discussed.
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권영일 청주대학교 산업과학연구소 2001 産業科學硏究 Vol.19 No.1
Conducting reliability qualification tests for some mechanical or automobile parts is extremely expensive due to the high prices of the sample items used on tests and the high operating costs of performing the reliability tests. One of the practical approaches that can reduce the sample sizes and testing durations of reliability qualification tests is to use the no-failure acceptance criterion. In this paper, reliability qualification test plans with no-failure acceptance criterion are suggested for exponential, Weibull, and log-normal lifetime distributions Some numerical examples are given.
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권영일 청주대학교 2004 産業科學硏究 Vol.22 No.1
A reliability qualification test method for assessing useful lifetimes of parts or materials is developed. We consider a situation where the performance of an item degrades as time goes by and the failure of an item is defined as the point at which the performance of the item reaches a pre-specified value. The reliability qualification test procedure and a numerical example are provided to illustrate the use of the developed reliability qualification test and procedure.
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권영일,송인철 청주대학교 산업과학연구소 1991 産業科學硏究 Vol.9 No.-
Optimal heat treatment method on gear and gear shaft material are considered. Some experiments are planned, performed and analyzed to decide the optimal heat treatment conditions. Two schemes for heat treatments are suggested considering ecomomical aspects of the heat treatment methods.
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Limited Failure Population에 대한 베이지안 샘플링검사방식 설계
권영일 청주대학교 산업과학연구소 2002 産業科學硏究 Vol.20 No.1
A Bayesian acceptance sampling plan for limited failure populations is developed. We consider a situation where defective products have short lifetimes and non-defective ones never fail during the technological life of the products. An acceptance criterion which guarantees the outgoing quality of accepted products is derived using the prior information on the quality of lots submitted for inspection. Numerical examples are provided.
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