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Chinese Physics Letters 2005年第5期22卷 1072-1075页

作者：周涛汪秉宏 nonlinearsciencecenteranddepartmentofmodernphysics UniversityofScienceandTechnologyofChinaHeifei230026

An alternative model about cascading occurrences caused by perturbation is established to search the mechanism because catastrophes in networks occur. We investigate the avalanche dynamics of our model on two-dimensional Euclidean lattices and scale-free networks and find that the avalanche dynamic behaviour is sensitive to the topological structure of networks. The simulation results show that the catastrophes occur much more frequently in scale-free networks than those in Euclidean lattices, and the greatest catastrophe in scale-free networks is much more serious than that in Euclidean lattices. Furthermore, we have studied how to reduce the catastrophes' degree, and have schemed out an effective strategy, called the targeted safeguard strategy for scale-free networks.

关键词： Disasters

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Networks Emerging from the Competition of Pullulation and Decrepitude

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Chinese Physics Letters 2005年第5期22卷 1285-1288页

作者：蒋品群汪秉宏周涛金颖滴傅忠谦周佩玲罗晓曙 nonlinearsciencecenteranddepartmentofmodernphysics UniversityofScienceandTechnologyofChinaHefei230026 DepartmentofElectronicScienceandTechnology UniversityofScienceandTechnologyofChinaHefei230026 CollegeofPhysicsandInformationEngineering GuangxiNormalUniversityGuilin541004

In real-world network evolution, the aging effect is universal. We propose a microscopic model for aging networks, which suggests that the activity of a vertex is the result of the competition of two factors: pullulation and decrepitude. By incorporating the pullulation factor into previous models of aging networks, both the global and individual aging effect curves in our model are single peaked, which agrees with the empirical data well. This model can generate networks with scale-free degree distribution, large clustering coefficient and small average distance when the decrepitude intensity is small and the network size not very large. The results of our model show that pullulation may be one of the most important factors affecting the structure and function of aging networks and should not be neglected at all.

关键词： SMALL-WORLD NETWORKS COMPLEX NETWORKS DYNAMICS

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Strategy Uniform Crossover Adaptation Evolution in a Minority Game

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Chinese Physics Letters 2003年第10期20卷 1659-1661页

作者：杨伟松汪秉宏全宏俊胡进锟 nonlinearsciencecenteranddepartmentofmodernphysics UniversityofScienceandTechnologyofChinaHefei230026 DepartmentofAppliedPhysics SouthChinaUniversityofTechnologyGuanzhou510641 InstituteofPhysics AcaxlemiaSinicaNankangTaipei11529

We propose and study a new adaptation minority game for understanding of the complex dynamical behaviour characterized by agent interactions competing limited resource in many natural and social systems. Intelligent agents may modify a part of strategies held by them periodically, depending on the strategy performances. In the new model, the strategies will be updated according to uniform-crossover variation process inspired by genetic evolution algorithm in biology. The performances of the agents in the new model are calculated for different parameter conditions. It has been found that the new system may evolve via the strategy uniform crossover adaptation mechanism into a frozen equilibrium state in which the performance of the system may reach the best limit, implying the strongest cooperation among agents and the most effective utilization of the social resources.

关键词：复杂系统模拟遗传算法对策论一致交叉策略更新动力学系统

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