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Discrete Block Replacement Policies under Random Use Durations  

Yoo Young Kwan (한라대학교 경영학부)
Publication Information
Journal of Korean Society for Quality Management / v.32, no.3, 2004 , pp. 62-67 More about this Journal
Abstract
This paper presents and compares two block replacement policies under random use durations. The units are put in service altogether and then idle for some time. The time durations during which units are put in service are random variables. Two block replacement policies, called N-policy and T-policy, are presented. Under N-policy, units are replaced altogether after the Nth use. Under T-policy, units are replaced altogether at the end of the use after cumulative use time T elapses. The failures during use durations are replaced by new ones individually. The cost rate expressions under the policies are derived for exponential use durations. Numerical examples are presented to compare the performances of the two policies.
Keywords
Block Replacement; Failure Replacement; Random Use Duration;
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