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An Optimal Inspection and Replacement Policy

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2 Author(s)
Mine, Hisashi ; Department of Applied Mathematics and Physics//Faculty of Engineering//Kyoto University//Kyoto 606, JAPAN ; Kawai, Hajime

An optimal inspection and replacement policy is discussed for a unit which assumes any one of several Markov states. The policy evaluation function is the s-expected cost-per-unit-time over an infinite time span. The problem is formulated as a semi-Markov decision process with a modified policy-improvement routine. Some properties of the optimal policy are discussed, for example, the control limit rule holds and the inspection time interval becomes shorter as degradation progresses.

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Reliability, IEEE Transactions on  (Volume:R-24 ,  Issue: 5 )