下载网络的波动
Fluctuation of the download network
摘要：
本文给出了几年前我们基于张的Encophysics网页研究的下载网络涨落的标度行为。在下载速率的色散$σ$和平均通量$<f>$之间存在幂律缩放，即$σ\sim < f> ^ α$。波动指数$α$既不是1/2，也不是1，这在以前的出版物中被称为两个通用波动类，而是随着下载数据被累积的时间窗口而从1/2变化到1。波动指数的交叉行为可以通过小规模系统的外部驱动波动模型或认为拥塞是起源的网络交通模型来定性地理解。
英文摘要：
The scaling behavior of fluctuation for a download network which we have investigated a few years ago based upon Zhang's Encophysics web page has been presented. A power law scaling, namely $σ\sim < f> ^ α$ exists between the dispersion $σ$ and average flux $<f>$ of the download rates. The fluctuation exponent $α$ is neither 1/2 nor 1 which was claimed as two universal fluctuation classes in previous publication, instead it varies from 1/2 to 1 with the time window in which the download data were accumulated. The crossover behavior of fluctuation exponents can be qualitatively understood by the external driving fluctuation model for a small-size system or a network traffic model which suggests congestion as the origin.
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