本文中，我們將採用Yeh Lam(2007)冪過程(power process)模型及成本模型來探討維修保養的問題。在單一構面的情形下，我們利用與Yeh Lam(2007)不同角度來推論最佳策略的存在性。在此角度下，可簡單低推論到雙構面的情形。

In this paper, we will introduce a power process model by Yeh Lam(2007) and a cost model to discuss the preventive maintenance problem. In the one-dimensional policy, we use different perspective from Yeh Lam(2007) to infer the existence of the best policy. In this perspective, we can simply inference to two-dimensional policy.

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