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中文摘要：
基于对卸船机调度特征的描述，建立了以最小化卸载作业完成时间为目标的卸船机调度优化模型，设计了混合遗传算法组件以获得问题近似最优解，通过松弛原问题中的难约束，推导了松弛问题的下界并作为原问题的下界．同时，对具有不同规模的问题进行实例计算与分析．结果表明，所设计的混合遗传算法能够在可接受的计算时间内获得合理的解．
英文摘要：
Based on the description of scheduling characteristics of ship unloaders, a scheduling optimization model was formulated to minimize the time for unloading operation. The components of a hybrid genetic algorithm were designed to obtain its near optimal solutions. By relaxing the complex constraints of the original problem, a lower bound for the relaxed problem was introduced to be a lower bound for the original problem. Moreover, computational experiments were conducted on instances of different sizes. The computational results show that the developed hybrid genetic algorithm can obtain reasonable solutions within an acceptable computational time.
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