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沿海运输权指一国国内沿海从事运输贸易的权利。考虑沿海捎带下,对轴辐式网络进行优化分析,得到无容量限制的单分配多枢纽中位问题的0-1整数规划模型。算例选择由亚欧航线上由中国和西北欧的共计36个港口组成的班轮海运网络。模拟结果表明,东西向和双向航线中,最优枢纽港个数随着规模经济系数的不同有差别,枢纽港个数设置为6或7个网络运输总成本达到最小;枢纽港选择与非枢纽港分配受沿海运输权影响,若允许外轮捎带,将使香港港和釜山港丧失大部分中转业务。
Coastal transport rights refer to the right of a country to engage in transport trade along its coast. Considering coastal incidentals, we optimize the hub-and-spoke network to get the 0-1 integer programming model of single-distribution multi-hub neutral problem with no capacity limitation. The example selects the liner shipping network consisting of a total of 36 ports on China-Europe and North-Western Europe on the Asia-Europe route. The simulation results show that in the east-west route and the two-way route, the number of the optimal hub ports varies with the economies of scale, and the total transportation cost with the number of hub ports set to 6 or 7 reaches the minimum. The allocation of ports is affected by the right of coastal transportation. If the outer rounds are allowed to be piggy-backed, most of the transit operations will be lost in Hong Kong and Busan Ports.