发表机构
Korea Institute of Energy Technology; Hanyang University(韩国能源技术研究院; 汉阳大学)
机构由 AI 辅助整理,请以论文原文为准。AI 中文总结
本研究通过密度依赖的迁出迁入活动解释城际平均流的人口规模标度,并利用条件高斯平均产生带高斯截断的中间幂律,以刻画城际净流重尾分布,同时提出生成方差分布的随机模型。
AI 中文摘要
我们展示了不同城市间县域的迁移如何同时解释平均城际流的人口规模标度以及城际净流分布的重尾特性。密度依赖的迁出和迁入活动决定了平均流如何随出发地和目的地城市的人口规模变化。我们假设县域对净流服从高斯分布,其标准差与它们的平均方向流成正比。在县域对净流之间相关性固定的条件下,它们的和是高斯分布。将这一条件高斯密度对相关性分布进行平均,可以产生带有高斯截断的中间幂律。我们还提出了一个随机模型,用于生成该混合中所使用的方差分布。
英文摘要
We show how migration between counties in different cities can explain both the population scaling of mean intercity flows and heavy-tailed intercity net-flow distributions. Density-dependent departure and arrival activities determine how mean flows scale with the populations of the origin and destination cities. We assume Gaussian county-pair net flows with standard deviations proportional to their mean directional flows. At a fixed correlation between county-pair net flows, their sum is Gaussian. Averaging this conditional Gaussian density over the correlation distribution can produce an intermediate power law with a Gaussian cutoff. We also present a stochastic model that generates the variance distribution used in this mixture.
Comments9 pages; 1 figures;