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Randon Threshold를 가진 부품의 정기 검사하에서 최적 교환 정책
공명복 울산대학교 1990 연구논문집 Vol.21 No.1
부품은 시감에 따라 연속적으로 마모되어 마모가 Rendom Threshold를 능가하면 고장을 일으킨다. 부품은 정기적으로 행하는 검사 시점에서 어떤 마모 수준을 넘으면 예방 교환된다. 고장나면 즉시 교환된다. 단위 시간당 평균 비용을 최소화하는 최적 교환 수준을 유도하였다. 고장 밀도 함수가 Logarithmically Convex Density인 경우 예방 교환을 하지 않는 것이 최적 정책이다. An item fails when it wears continuously on time beyond a random threshold. The item is preventively replaced if the wear at periodic inspections exceeds a certain wear level. Upon failure, it is replaced immediately. The optimal wear level for preventive replacement which minimiges the long-run average cost per unit of time is derived. In case of logarithmically convex density of failure, no preventive replacement policy is optimal.
공명복 울산대학교 1985 연구논문집 Vol.16 No.2
본 논문은 체계의 고장이 시간에 대하여 연속적으로 누적되는 체계의 상태에 의존하여 발생하는 경우 정기검사에 의한 예방정비모형을 제시하고 있다. 체계의 사용연한이 무한한 경우 재생이론을 적용함으로써 단위사용시간당 평균비용을 최소화하는 최적교체수준을 구하였다. This paper deals with a periodic inspection preventive maintenance model for the systems whose failures are dependent only on their states accumulated continuously in time. The optimal replacement level which high minimizes the expected cost per unit time for an infinite time span is obtained by the applications of Renewal Theory.
원자력 발전소 디지털 원자로 보호시스템의 설계에 대한 안전성 평가
공명복,이상용 대한산업공학회 2010 산업공학 Vol.23 No.1
Digital reactor protection system which consists of many identical modules, is fault- tolerant to provide high safety. The modules themselves including DSP(digital signal processing) card are also fault-tolerant in nature. This paper assesses the safety for being-designed digital reactor protection system of 2-out-of-4 G structure with lockout. Some interesting design alternatives are compared. Fault tree analysis for assessing system safety is performed by Relex software. The selected reactor protection system fully satisfies EPRIURD stipulation of mean failure time of 50 years.
디지털 원자로 보호시스템에 대한 신뢰도 및 가용도 평가
공명복 ( Myung Bock Kong ),이상용 ( Sang Yong Lee ) 한국경영공학회 2011 한국경영공학회지 Vol.16 No.3
Reactor protection system(RPS) is an important safety-related facility. RPS shutdowns a nuclear reactor as well as actuates engineered safety features to prevent the release of radioactive materials when nuclear reactor is in an abnormal condition. RPS has a feature of redundant design to meet high reliability. However, the failure of the RPS itself has to stop the reactor for safety so that it causes forced outage of the nuclear power plant. Forced outage incurs economic loss not to produce electricity. Therefore, the failure of RPS should be repaired soon. Thus, the availability analysis for RPS is required to decide regarding the repair of it. The paper evaluates the reliability and availability for the designed digital RPS. Reliability block diagram(RBD) analysis of Relex software is used to calculate them.
디지털 원자로 보호시스템의 공통원인고장 분석에 관한 사례연구
공명복(Myung-Bock Kong),이상용(Sang-Yong Lee) 대한산업공학회 2012 산업공학 Vol.25 No.4
Reactor protection system to keep nuclear safety and operational economy of plants requires high reliability. Such a high reliability of the system can be achieved through the redundant design of components. However, common cause failures of components reduce the benefits of redundant design. Thus, the common cause failure analysis, to accurately calculate the reliability of the reactor protection system, is carried out using alpha-factor model. Analysis results to 24 operating months are that 1) the system reliability satisfies the reliability goal of EPRI-URD and 2) the common cause failure contributes 90% of the system unreliability. The uncertainty analysis using alpha factor parameters of 0.05 and 0.95 quantile values shows significantly large difference in the system unreliability.
An Optimal Inspection and Preventive Replacment Policy
Gong, Moung-Bock 울산대학교 1984 연구논문집 Vol.15 No.1
본 논문은 고장을 검사에 의해서만 탐지할 수 있는 준비태세 시스템의 새로운 정비정책을 제시하고 있다. 정책은 고장을 발견즉시 교체하거나 예방정비로서 시간 x??에 교체하는 것이다. This paper presents a new maintenance policy for a preparedness system in which a failure is detected by inspection only. The policy treated is that replace upon detection of failure or at time x?? as a preventive maintenance.