This paper considers the model of a k-out-of-n:G system with non-identical components which are subject to both forced and planned outages. For the forced outages, it assumes that there are the independent and common-cause outage events causing component failures. Then, the objective is to derive the upper and lower bounds on the mean operating time between system failures in the ample-server model. In addition, the mean system failure times are also considered. [In Korean.]
