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An integer linear program to combine container handling and yard crane deployment

机译:结合容器处理和堆场起重机部署的整数线性程序

摘要

The number of containers handled by container terminals has increased significantly over the last fifty years and has stimulated researchers to improve storage yard operations. Container handling and crane deployment are two major yard operations that can impact the performance of a whole container terminal. This thesis establishes an Integer Linear Program (ILP) to combine container handling and yard crane deployment for Rubber Tired Gantry Cranes (RTG). Using real world data, we test the ILP for two different yard sizes. We find the resulting ILPs difficult to solve directly. In order to decrease the computation time, we apply a cascade method that solves the problem as a sequence of restricted subproblems. Each subproblem is restricted to a sequence of containers and the output of each subproblem provides an input to the next subproblem. This method provides better solutions than the solution that we get by solving the problem directly. The cascade method also decreases the computation time significantly. The results demonstrate the ability to combine container handling and yard crane deployment in a single model and they verify that the cascade method works well with the ILP.
机译:在过去的五十年中,集装箱码头处理的集装箱数量大大增加,并刺激了研究人员改善仓储场的运作。集装箱装卸和起重机吊装是两个主要的堆场操作,可能会影响整个集装箱码头的性能。本文建立了一个整数线性程序(ILP),将集装箱搬运和轮胎式龙门起重机(RTG)的堆场起重机布置相结合。使用现实世界的数据,我们测试了两种不同码数大小的ILP。我们发现生成的ILP很难直接解决。为了减少计算时间,我们应用了级联方法,将其作为一系列受限子问题来解决。每个子问题仅限于一系列容器,每个子问题的输出为下一个子问题提供输入。与直接解决问题所获得的解决方案相比,此方法提供了更好的解决方案。级联方法还大大减少了计算时间。结果证明了在单个模型中将集装箱处理和堆场起重机部署相结合的能力,并且他们验证了级联方法与ILP一起可以很好地工作。

著录项

  • 作者

    Akel Kamil.;

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  • 年度 2007
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