The port tugboat operation scheduling is a kind of parallel machines scheduling problem with special process constraint.

港口的拖轮调度过程是一类带特殊工艺约束的并行多机调度问题。

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The adaptive punishment strategy that is used to process constraint conditions is designed to apply the combined optimizing algorithm.

为了便于应用本文的混合优化算法对约束优化问题进行求解，设计了一种处理约束条件的自适应惩罚策略。

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It can take one of two forms — either having a single constraint to process or a list of constraints to process.

它采用两种形式之一——要么用单一约束进行处理，要么用一系列约束进行处理。

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And so, one constraint is the process be done reversibly.

一种约束,就是过程是可逆的。

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So far no bill has bounced between the Houses more than 15 times, but one constraint on the process might be finding a different ink to signify the exchange of amendments.

BBC: That most mysterious of Westminster rituals