基于多层复杂网络的物流枢纽城市多尺度分析及发育评价

多层网络(Multilayer Network)是国际研究领域正在兴起的概念，着眼于以不同准则叠加聚合的互补性网络的系统特征和影响力.以全球物流枢纽城市为研究对象，在构建海运、空运、物流企业组织及国际贸易网络的基础上，借助Gephi分析工具，试图从网络结构特性及节点物流运行能力揭示多层物流网络的复杂性特征，实现网络聚合并运用t-SNE与聚类算法，评估城市发育水平并探索其空间分布规律.结果表明：物流网络表现出显著的小世界及无标度特性；呈现以“欧洲西部-亚洲东部及南部-亚洲西部-北美洲东部”为核心的菱形空间结构；其分布具有明显的层级性，不同等级城市分布具有空间异质性.

Multi-scale Analysis and Development Evaluation of Logistics Hub Cities Based on Multi-layer Complex Networks

One of the most challenging issues of contemporary complex network research is to understand the structure of the multilayer network better. It is focused on the feature and influence of complex system converged by different scales. A framework is developed for linking the data of different networks, such as the maritime network, air freight network, organization network of logistics enterprises and international trade network. The primary purpose of this study is to analyze the structural complexity of the logistics network by indicators of network structure and the influence of the nodes using the method of Gephi. And further, the multilayer network is converged by the link overlap to evaluate what kind of the developing phase based on the algorithm of t-SNE and k-means. ArcGIS is applied to visualize the spatial distribution of the different groups of the logistics hub cities. The analysis highlights that the structure of the logistics network features small world property and scale- free. Besides, the backbone of the logistics network is diamond- shaped and distributed by five significant areas (Western Europe, Eastern and Southern Asia, Western Asia, Eastern North America). Moreover, the network of logistics hub is hierarchical, and the urban at different levels show remarkable spatial heterogeneity.