利用概率分析和随机模型的密度演化方法，导出了系统的一些新的可靠性指标和最优检测策略。
The new system reliability indices and the optimal inspection policy are obtained by using probability analysis and the density evolution method in stochastic.
采用在广义随机空间内计算各机构可靠指标，然后利用PNET法计算结构体系可靠度，计算简便，精度也满足要求。
It is suggested that the reliability index of each individual mechanism be calculated in generalized stochastic space, and then structural system reliability be calculated in terms of PNET.
并利用随机微分方程和偏微分方程之间的关系，对股票投资风险进行了估计，得到关于风险指标的动态轨线。
By using the relation between the stochastic, differential equations and the PDEs, we estimate the risk of investing stocks, and obtain the dynamic traces 'of risk functions.
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