Interfacility Interaction in Models of Hub and Spoke Networks
研究了运输服务中枢纽与辐条网络里设施选址的相互依赖关系，通过分析不同模型在相似位置选择枢纽时的解行为，发现采用凹成本函数的模型会促进流量整合并产生整数设施解。
Providers of transportation services may reduce their average unit costs by bundling flows and channeling them between hubs (also known as concentrators or routers). The resulting facility locations are interdependent because of the flows between them. This paper analyzes mathematical models of hub systems in an effort to enhance understanding of the optimal location of interactive facilities. The paper examines the behavior of solutions to several alternative models that require the location of a hub at either of two similar locations. A model employing a concave cost function favors the assembly of flows, penalizes fractional facility locations, and produces local minima that have integer facilities.