Universal features of correlated bursty behaviour.

Universal features of correlated bursty behaviour.
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DOI:
10.1038/srep00397
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发表时间:
2012
期刊:
影响因子:
4.6
通讯作者:
Kertesz, Janos
Kertesz, Janos
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Karsai, Marton;Kaski, Kimmo;Barabasi, Albert-Laszlo;Kertesz, Janos

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不均匀的时间过程,如人类通信中出现的那些,神经元尖峰序列,地震信号,包括高活动的突发间隔与长时间的低活动周期交替。在最近的研究中,这种突发行为的特点是一个厚尾事件间的时间分布,而时间相关性的自相关函数测量。然而,这些特征函数不能完全表征时间相关的异质行为。在这里,我们表明,在突发期间的事件的数量的分布作为一个很好的指标的依赖关系,导致普遍观察幂律分布的广泛的一类现象。我们发现,这些完全不同的系统中的相关性通常可以通过记忆效应来解释,并通过一个简单的唯象模型来描述,该模型显示出与真实的系统定性相似的时间行为。
Inhomogeneous temporal processes, like those appearing in human communications, neuron spike trains, and seismic signals, consist of high-activity bursty intervals alternating with long low-activity periods. In recent studies such bursty behavior has been characterized by a fat-tailed inter-event time distribution, while temporal correlations were measured by the autocorrelation function. However, these characteristic functions are not capable to fully characterize temporally correlated heterogenous behavior. Here we show that the distribution of the number of events in a bursty period serves as a good indicator of the dependencies, leading to the universal observation of power-law distribution for a broad class of phenomena. We find that the correlations in these quite different systems can be commonly interpreted by memory effects and described by a simple phenomenological model, which displays temporal behavior qualitatively similar to that in real systems.
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