近年虽然不乏测度银行信用风险方面的研究，但都只限于考虑风险最低的单目标模型。

Recently, many models are adopted to measure the credit risk. However, these models usually ignore the optimization of portfolio.

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本文讨论了系统的最优维修策略问题，考虑到题目中所涉及的变量大多为随机变量，我们建立了单目标的期望值模型。

Optimal maintenance policy problem in a system is discussed and analysed in this paper. Due to the random variable concerned, one objective mathematical model of expectation value is developed.

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在假定单个目标均匀分布的基础上，运用离散的方法研究并建立单发子母弹对集群目标射击的效率评定模型。

Based on the assumption of uniform distribution of single target, the fire efficiency assessment model of single cluster ammunition attacking group targets was set with discrete method.

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