The mathematical expected value of potential leakage length can be taken as the optimization criterion of valve position when leakage points don't distribute equally along the pipeline. 当泄漏点沿管道不均匀分布时,可以采用潜漏长度的数学期望值作为阀门位置优化准则。
This paper discusses the unreliability of "Expected Monetary Value" criterion in risk decision, analyses the nature of utility curves and the attitudes to risk, and points out the problems in the application of utility theory. 本文陈述了人们对风险决策中期望收益准则的疑虑,分析了效用曲线的性质和对风险态度的关系,指出了效用理论在运用中的问题。