Université de Fribourg

Role of activity in human dynamics

Zhou, Tao ; Kiet, H. A. T. ; Kim, B. J. ; Wang, B.-H. ; Holme, P.

In: Europhysics Letters, 2008, vol. 82, no. 2, p. 28002

The human society is a very complex system; still, there are several non-trivial, general features. One type of them is the presence of power-law–distributed quantities in temporal statistics. In this letter, we focus on the origin of power laws in rating of movies. We present a systematic empirical exploration of the time between two consecutive ratings of movies (the interevent time). At an...

Université de Fribourg

A limited resource model of fault-tolerant capability against cascading failure of complex network

Li, P. ; Wang, B.-H. ; Sun, H. ; Gao, P. ; Zhou, Tao

In: The European Physical Journal B, 2008, vol. 62, no. 1, p. 101-104

We propose a novel capacity model for complex networks against cascading failure. In this model, vertices with both higher loads and larger degrees should be paid more extra capacities, i.e. the allocation of extra capacity on vertex i will be proportional to ki γ , where ki is the degree of vertex i and γ > 0 is a free parameter. We have applied this model...