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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 $��\sim < f> ^ ��$ exists between the dispersion $��$ and average flux $$ of the download rates. The fluctuation exponent $��$ 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.
4 pages, 4 figures
Nuclear Theory (nucl-th), Physics - Physics and Society, Nuclear Theory, Statistical Mechanics (cond-mat.stat-mech), Physics - Data Analysis, Statistics and Probability, FOS: Physical sciences, Physics and Society (physics.soc-ph), Condensed Matter - Statistical Mechanics, Data Analysis, Statistics and Probability (physics.data-an)
Nuclear Theory (nucl-th), Physics - Physics and Society, Nuclear Theory, Statistical Mechanics (cond-mat.stat-mech), Physics - Data Analysis, Statistics and Probability, FOS: Physical sciences, Physics and Society (physics.soc-ph), Condensed Matter - Statistical Mechanics, Data Analysis, Statistics and Probability (physics.data-an)
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