@article{ref1,
title="Origin of the scaling law in human mobility: Hierarchy of traffic systems",
journal="Physical review E: Statistical, nonlinear, and soft matter physics",
year="2011",
author="Han, Xiao-Pu and Hao, Qiang and Wang, Bing-Hong and Zhou, Tao",
volume="83",
number="3 Pt 2",
pages="036117-036117",
abstract="Uncovering the mechanism leading to the scaling law in human trajectories is of fundamental importance in understanding many spatiotemporal phenomena. We propose a hierarchical geographical model to mimic the real traffic system, upon which a random walker will generate a power-law-like travel displacement distribution with tunable exponent, and display a scaling behavior in the probability density of having traveled a certain distance at a certain time. The simulation results, analytical results, and empirical observations reported in D. Brockmann et al. [Nature (London) 439, 462 (2006)] agree very well with each other.<p /> <p>Language: en</p>",
language="en",
issn="1539-3755",
doi="",
url="http://dx.doi.org/"
}