为了得到目标函数的等价形式，首先导出期望完工时间的一个表达式。

First drives an expression of expected completion time in order to get the equivalent form of the objective function.

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研究具有链式约束的单机随机排序问题，目标函数为加权总完工时间的数学期望。

This paper discusses the stochastic scheduling on a single machine to minimize total weighted completion time subject to precedence constraints of chains.

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