Discrete Block Replacement Policies under Random Use Durations

Yoo Young Kwan,

Journal of Korean Society for Quality Management > Volume 32(3); 2004 > Article

Journal of Korean Society for Quality Management 2004;32(3): 62-.

확률적인 사용시간하의 이산적 일제교체정책

유영관

한라대학교 경영학부

Discrete Block Replacement Policies under Random Use Durations

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.

Key Words: Block Replacement;Failure Replacement;Random Use Duration;