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Journals and Conferences
This paper investigates a stochastic model for a software error detection process in which the growth curve of the number of detected software errors for the observed data is S-shaped. The software… (More)
This paper extends an optimal software release problem to both cost and reliability requirements. The optimum software release time is determined both by minimizing a total average software cost and… (More)
The s-shaped growth curves of detected software errors can be observed in software testing. The delayed s-shaped and inflection s-shaped software reliability growth models based on a nonhomogeneous… (More)
The discrete Weibull distribution is defined to correspond with the Weibull distribution in continuous time. A few properties of the discrete Weibull distribution are discussed.
This paper discusses the ordering policies, in which a delivered spare is put into inventory until a prespecified time if an original unit is still operating. Under certain conditions there exists a… (More)
An age replacement problem is considered taking account of costs for stock and system down. The stochastic behavior of this model is analyzed and the optimum age replacement policies are discussed.
An ordering policy allows a spare, delivered after a constant lead time, to be put into inventory. Under certain conditions there exists a finite and unique ordering policy maximizing the cost… (More)
We consider a generalized ordering policy in which, prior to failure, we order a spare unit which can be delivered after a constant lead time. We are interested in the optimal ordering policy which… (More)
We consider a simple but interesting ordering policy and discuss the ordering policy which minimizes the s-expected cost rate.
We discuss two models of 2-unit standby redundant systems with imperfect switchover. In Model I the switch assumes up and down states repeatedly, independently of the behavior of the main unit. We… (More)