Chin. Phys. Lett.  2008, Vol. 25 Issue (5): 1912-1915    DOI:
Original Articles |
A Non-Stationary Poisson Model for the Scaling of Urban Traffic Fluctuations
CHEN Yu-Dong;LI Li;ZHANG Yi;JIN Xue-Xiang
Tsinghua National Laboratory for Information Science and Technology (TNList), Department of Automation, Tsinghua University, Beijing 100084
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CHEN Yu-Dong, LI Li, ZHANG Yi et al  2008 Chin. Phys. Lett. 25 1912-1915
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Abstract We investigate the traffic flow volume data on the time dependent activity of Beijing's urban road network. The couplings between the average flux and the fluctuations on individual links are shown to follow certain scaling laws and yield a wide variety of scaling exponents between 1/2 and 1. To quantitatively explain this interesting phenomenon, a non-stationary Poisson arriving model is proposed. The scaling property is interpreted as the result of the time-variation of the arriving rate of flux over the network, which nicely explicates the effect of aggregation windows, and provides a concise model for the dependence of scaling exponent on the external/internal force ratio.
Keywords: 89.75.-k      89.75.Da      05.40.-a     
Received: 16 November 2007      Published: 29 April 2008
PACS:  89.75.-k (Complex systems)  
  89.75.Da (Systems obeying scaling laws)  
  05.40.-a (Fluctuation phenomena, random processes, noise, and Brownian motion)  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2008/V25/I5/01912
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CHEN Yu-Dong
LI Li
ZHANG Yi
JIN Xue-Xiang
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