然而近年来研究发现网络流量具有自相似性，传统的基于泊松分布的流量模型已不能很好地表述这一特征。
Recently much research shows that many kinds of network traffics are self-similar, which can't be described accurately by traditional traffic models based on Poisson distribution.
对自相似流量模型下的排队分析方法目前还很不成熟。
The queuing analysis with self similar traffic is not complete until now.
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