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Optimal PM policy following the expiration of k0-RRW †
Journal of the Korean Data & Information Science Society 2020;31:41-9
Published online January 31, 2020;
© 2020 Korean Data and Information Science Society.

Ki Mun Jung1

1Division of Mathematics and Applied Statistics, Kyungsung University
Correspondence to: Professor, Division of Mathematics and Applied Statistics, Kyungsung University, Busan, 48434, Korea. E-mail:
This research was supported by Kyungsung University Research Grants in 2018.
Received October 28, 2019; Revised December 16, 2019; Accepted December 17, 2019.
This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
Jung (2018a) suggest the k0-renewing replacement warranty (k0-RRW) of a repairable system. This paper proposes the PM model following the expiration of k0-renewing replacement warranty and then the optimal PM policy from the user’s point of view is determined. As a criterion of optimality, we utilize the expected cost rate per unit time during the life cycle. That is, we determine the optimal PM period and the optimal PM number by minimizing the expected cost rate per unit time from the user’s perspective. Finally, the numerical examples are presented for illustrative purpose.
Keywords : Expected cost rate per unit time, k0-renewing replacement warranty, optimal PM period, optimal PM number, PM model.