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A study on some urban bus transport networks

机译:一些城市公交运输网络的研究

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In this paper, we present the empirical investigation results on the urban bus transport networks (BTNs) of four major cities in China. In BTN, nodes are bus stops. Two nodes are connected by all edge when the stops are serviced by a common bus route. The empirical results show that the degree distributions of BTNs take exponential function forms. Other two statistical properties of BTNs are also considered, and they are suggested as the distributions of so-called "the number of stops in a bus route" (represented by S) and "the number of bus routes a stop joins" (by R). The distributions of R also show exponential function forms, while the distributions of S follow asymmetric, unimodal functions. To explain these empirical results and attempt to simulate a possible evolution process of BTN, we introduce a model by which the analytic and numerical result obtained agrees well with the empirical facts. Finally, we also discuss some other possible evolution cases, where the degree distribution shows a power law or an interpolation between the power law and the exponential decay. (c) 2006 Elsevier B.V. All rights reserved.
机译:在本文中,我们提出了对中国四个主要城市的城市公交运输网络(BTN)的实证研究结果。在BTN中,节点是公交车站。当通过公共巴士路线服务于车站时,所有边缘将两个节点连接起来。实验结果表明,BTN的度分布呈指数函数形式。还考虑了BTN的其他两个统计属性,它们被建议为所谓的“公交路线中的站点数”(用S表示)和“公交站点所连接的公交路线数”(用R表示)的分布。 )。 R的分布也显示指数函数形式,而S的分布遵循非对称单峰函数。为了解释这些经验结果并尝试模拟BTN可能的演化过程,我们引入了一个模型,通过该模型所获得的解析和数值结果与经验事实非常吻合。最后,我们还讨论了其他一些可能的演化情况,其中度数分布显示幂律或幂律与指数衰减之间的插值。 (c)2006 Elsevier B.V.保留所有权利。

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