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Statistical Property and Model for the Inter-Event Time of Terrorism Attacks 被引量:6
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作者 ZHU Jun-Fang HAN Xiao-Pu WANG Bing-Hong 《Chinese Physics Letters》 SCIE CAS CSCD 2010年第6期273-276,共4页
The inter-event time of terrorism attack events is investigated by empirical data and model analysis. Empirical evidence shows that it follows a scale-free property. In order to understand the dynamic mechanism of suc... The inter-event time of terrorism attack events is investigated by empirical data and model analysis. Empirical evidence shows that it follows a scale-free property. In order to understand the dynamic mechanism of such a statistical feature, an opinion dynamic model with a memory effect is proposed on a two-dimensional lattice network. The model mainly highlights the role of individual social conformity and self-affirmation psychology. An attack event occurs when the order parameter indicating the strength of public opposition opinion is smaller than a critical value. Ultimately, the model can reproduce the same statistical property as the empirical data and gives a good understanding for the possible dynamic mechanism of terrorism attacks. 展开更多
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Scaling Behaviour and Memory in Heart Rate of Healthy Human
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作者 蔡世民 彭虎 +3 位作者 杨会杰 周涛 周佩玲 汪秉宏 《Chinese Physics Letters》 SCIE CAS CSCD 2007年第10期3002-3005,共4页
We investigate a set of complex heart rate time series from healthy human in different behaviour states with the detrended fluctuation analysis and diffusion entropy (DE) method. It is proposed that the scaling prop... We investigate a set of complex heart rate time series from healthy human in different behaviour states with the detrended fluctuation analysis and diffusion entropy (DE) method. It is proposed that the scaling properties are influenced by behaviour states. The memory detected by DE exhibits an approximately same pattern after a detrending procedure. Both of them demonstrate the long-range strong correlations in heart rate. These findings may be helpful to understand the underlying dynamical evolution process in the heart rate control system, as well as to model the cardiac dynamic process. 展开更多
关键词 TIME-SERIES DIFFUSION SEQUENCES DYNAMICS
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