The problem is to determine the optimal replacementpolicy ( N , T )? such that the long-run expected cost per unit time is minimized.
利用几何过程，以系统大修次数N和大修时间间隔T为更换策略，选择最优策略（ N ， T）使系统经长期运行单位时间的期望费用最小。
2
Based on the present models of planned replacement, this paper studies on the problem of replacementpolicy with repairable units and limited spares.
在现有的计划更换模型的基础上，研究了一种备件有限及部件可修的更换策略问题。
3
An optimal replacementpolicy for series repairable system is studied assuming that the component after repair is not "as good as new" by using the geometric process model.