Research on the Evolution Mechanisms of Urban Public Traffic Based on Complex Network
|School||Shandong Normal University|
|Course||Computer Software and Theory|
|Keywords||Complex Networks Bus Transportation Networks Evolvement Organization Mechanism Programming|
Complex networks is the emerging research in recent years, it is the abstract from large number of real complex systems, the theory is widely used in various areas of society. As an open complex system, the city public transport have the structural properties of complex networks. In this paper, we set up a bus station network model and a bus transfer network model based on the Space L ’ method and Space P method, based on the Jinan City bus datas and use the complex network theory as a guide and use Matlab as modeling tools.We also calculate the basic statistics of the two models,for example,the Average Path Length,the Clustering Coefficient and the degree distribution.Analysis the statistical properties of Jinan public transport network from the aspacts of quantitative and qualitative. Empirical studies have shown that the distribution of Jinan public transport network are scale-free network with the degree distribution follow power-law, and the degree distribution of bus transfer network has a exponential distribution, is a small-world network which have large Clustering Coefficient and small Average Path Length.The evolution and development of public transport system is subject to urban spatial structure ,city planning and economy benifit, is a constantly changing network.. Abstractly, the nodes and edges of public transport network are always changing. The topology have a great impact to the functions fo network and dynamics. Based on the actual datas of Jinan public transport network,we set up a growth algorithm with the degree distribution obey Poisson distribution combine the theory of complex network , and based on this algorithm, we constract a local merit-based public transport network model. In setting the relevant parameters to generate a virtual model of the transit network..The simulation results anastomose with the actual characteristics of the bus network topology, confirmed that this model can be better reflected the public transport network formation and evolution mechanisms represented by Jinan City. The formation of urban public transport systems, development, and the evolution of public transportation systems are the common elements of the role of internal and external results. Of urban public transport development organization mechanism analysis shows that the development of urban public transport system not only depends on the self-organizing mechanism, but also depend on the impact of organizational mechanisms, are impacted by self-organizing and outside-organizing.The qulity of the public transport network structure affect the transport efficiency of the whole public transport system. Different sites have different roles in the public transit network. Through different nodes deletion strategy we analysis the varies of the number of PTN change、the node betweeness as well as the largest transit network connectivity. The public transport network has a strong robustness to draw on the random fault, and delete a specific node will cause paralysis of the network shows that specific node has an import role in public transportation network. Through the bus network structure analysis,we give the optimization recommendations to the existing public transportation network and get the planning strategy of PTN fit on our country.