• Title/Summary/Keyword: preventive policy

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수리 가능한 시스템에서의 최적 예방 보전 정책 (Optimal Preventive Maintenance Policy for a Repairable System)

  • Ji Hwan Cha;Jong Tae Jung;Jae Joo Kim
    • 품질경영학회지
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    • 제29권2호
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    • pp.46-53
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    • 2001
  • In this paper, a preventive maintenance(PM) policy for a repairable system is considered. The failure rate model proposed by Park et at.(2000) is generalized by assuming that after each PM not only the PM slows down the degradation process of the system but also reduces down the system failure rate by a certain fixed amount. Long-run expected cost rate of the PM policy is derived and the properties of joint solution of the optimal PM period and optimal number of PM which minimizes the expected cost rate are obtained. Numerical examples for the case of a Weibull-type failure rate are given.

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Block 대체정책에 관한 연구

  • 배문식
    • ETRI Journal
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    • 제6권3호
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    • pp.17-20
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    • 1984
  • A block replacement policy using items with different reliability is discussed. We devide system unit failure modes into two modes and use less reliable unit when operating unit fails near the planned preventive replacement time. In this policy, item A has two failure modes. Mode-1 failure is removed by minimal repair, mode-2 failure by replacement. If mode-2 failure of item A happens in (0,T- $\delta$). failure item A is replaced by new item A. If mode-2 failure of item A happens in(T-$\delta$,T), failure item A is replaced by new item B. Item B should be cheaper and less durable than item A. Under this policy, we determine the preventive replacement interval T and the interval $\delta$ of item B replacement which minimize the cost rate per unit time.

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일반 수리 모형에서의 최적 예방 보전 정책에 관한 연구 : ($\theta$, m) 보전 정책 (An Optimal Preventive Maintenance Policy with General Repair : ($\theta$, m)) Maintenance Policy)

  • 황정윤;박유진
    • 산업경영시스템학회지
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    • 제32권4호
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    • pp.9-16
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    • 2009
  • 본 논문에서는 시스템 연령(年齡)에 의해 보전 활동의 효과를 설명하는 일반 수리(修理) 개념을 이용한 최적 보전(保全) 정책에 대한 연구를 수행하였다. 본 논문에서는 주기적인 일반 수리와 고장 시 최소 수리가 적용되는 최적 보전 정책을 고려하였다. 따라서 일반 수리에 따른 보전 정책의 비용 함수를 도출하였고 최적 보전 정책을 도출하는 알고리즘을 제시하였고 예제를 통해 알고리즘의 성능을 분석하였다. 이 연구를 통해 시스템을 운영하는데 있어서 어느 수준의 보전 정책을 적용하며 어느 정도의 기간 동안 시스템을 유지할 것인지에 대안을 제공할 수 있을 것이다.

한방의료 관련 산업의 국민경제적 기여도 및 파급효과 (Input-Output Structure and Economic Effects of Oriental Medicine Industry in Korea)

  • 김진현;임병묵
    • 대한예방한의학회지
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    • 제8권1호
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    • pp.163-186
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    • 2004
  • The purpose of this parer is to identify the input-output structure of oriental medicine and its alternative medicine industries in an inter-industry context and to estimate its forward and backward effects on macroeconomic variables such as production, employment and price level. Input-output tables released by The Bank of Korea were used as data in this research and inter-industry analysis was adopted as research methodology. The industry takes less share of production, price and trade in a Korean economy, compared with other industry. However, the industry's capability of creating value added is estimated to be well above that of other industry and that of making new employments is as more than 4 times as other industries. This result gives us policy implications that the government should enhance its subsidy policy and economic (tax) incentives for oriental medicine and its related alternative medicine industries.

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