排序方式: 共有36条查询结果,搜索用时 203 毫秒
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分析集装箱空箱调运的发展近况,建立数学规划模型,通过数值计算,将不确定问题转化为确定问题。经过算例仿真,利用LINGO软件对所建模型进行求解。得出箱种代用下的最优空箱调运方案,运用该方案可以花费最少的空箱调运费用,从而验证模型的可行性与实用性。 相似文献
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文章对危险货物集装箱开箱检查的具体做法进行了探讨,并针对开箱检查发现的问题提出了对危险货物集装箱运输安全监督管理的建议。 相似文献
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This paper develops a mathematical program with equilibrium constraints (MPEC) model for the intermodal hub-and-spoke network design (IHSND) problem with multiple stakeholders and multi-type containers. The model incorporates a parametric variational inequality (VI) that formulates the user equilibrium (UE) behavior of intermodal operators in route choice for any given network design decision of the network planner. The model also uses a cost function that is capable of reflecting the transition from scale economies to scale diseconomies in distinct flow regimes for carriers or hub operators, and a disutility function integrating actual transportation charges and congestion impacts for intermodal operators. To solve the MPEC model, a hybrid genetic algorithm (HGA) embedded with a diagonalization method for solving the parametric VI is proposed. Finally, the comparative analysis of the HGA and an exhaustive enumeration algorithm indicates a good performance of the HGA in terms of computational time and solution quality. The HGA is also applied to solve a large-scale problem to show the applicability of the proposed model and algorithm. 相似文献
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海运集装箱空箱调运使集装箱班轮公司支付了高额的成本.针对目前的现实情况,从降低集装箱空箱调运过程中成本的角度,对海运集装箱空箱调运问题进行优化,使用线性规划的方法,对集装箱空箱调运过程中空箱的进出港、中转构建模型,结合所构建的模型,给出相关的算例,根据给定的数据计算出结果验证了所构建模型的合理性. 相似文献
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Lijun Zhao 《Maritime Policy and Management》2013,40(6):748-762
ABSTRACTSince the 1920s, seaborne cargo liability regimes have introduced a small number of mandatory rules into international carriage of goods by sea, through the Hague–Visby Rules, to restrict freedom of contract. These rules worked within a limited scope to offset imperfect competition in the shipping markets. However, the recent Hamburg and Rotterdam Rules attempted to extend this scope of seaborne cargo liability regime, which seems to be more extensive than is desirable. This article compares and examines the shipping sub-sectors’ environment and maritime economics over the past century up to date. The new business patterns of the shipping sub-sectors, the rising influence of developing countries, and the containerisation are creating new shipping environments for this area of law. Compared with previous decades, imperfect competition is only found in a smaller number of areas within the shipping markets nowadays. This article argues that only a limited scope of application is needed for international seaborne cargo liability regime. Thus, these new economic and political realities call for innovative modifications to the recent rules regarding the scope of application, and future regime should refocus international uniformity on a limited scope. 相似文献
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冷藏集装箱迅速发展成为国际贸易中的一种重要运输手段,但是,由于船舶冷藏集装箱随船运行在海上,所处环境差,所以制冷系统的故障经常发生且十分复杂,在此共模拟了四种故障,列出了各故障与原因之间的对应关系并建立了故障诊断范例集. 相似文献