Search Results - subject:"Extremal dynamics"

Improved extremal optimization for the asymmetric traveling salesman problem

Chen, Yu-Wang; Zhu, Yao-Jia; Yang, Gen-Ke; Lu, Yong-Zai - In: Physica A: Statistical Mechanics and its Applications 390 (2011) 23, pp. 4459-4465

problem (ATSP). At each update step, the IEO algorithm proceeds through two main steps: extremal dynamics and cooperative …

Persistent link: https://www.econbiz.de/10010591284

Optimization with extremal dynamics for the traveling salesman problem

Chen, Yu-Wang; Lu, Yong-Zai; Chen, Peng - In: Physica A: Statistical Mechanics and its Applications 385 (2007) 1, pp. 115-123

method with extremal dynamics. It is built up with the traveling salesman problem (TSP) being a typical NP-complete problem …. As self-organized critical processes of extremal dynamics, the optimization dynamics successively updates the states of …

Persistent link: https://www.econbiz.de/10010873862

The co-evolutionary dynamics of directed network of spin market agents

Horváth, Denis; Kuscsik, Zoltán; Gmitra, Martin - In: Physica A: Statistical Mechanics and its Applications 369 (2006) 2, pp. 780-788

The spin market model [S. Bornholdt, Int. J. Mod. Phys. C 12 (2001) 667] is generalized by employing co-evolutionary principles, where strategies of the interacting and competitive traders are represented by local and global couplings between the nodes of dynamic directed stochastic network. The...

Persistent link: https://www.econbiz.de/10011064289

On singular probability densities generated by extremal dynamics

Garcia, Guilherme J.M.; Dickman, Ronald - In: Physica A: Statistical Mechanics and its Applications 332 (2004) C, pp. 318-336

Extremal dynamics is the mechanism that drives the Bak-Sneppen model into a (self-organized) critical state, marked by … consequence of extremal dynamics. Furthermore we show that the extremal barrier xi always belongs to the ‘prohibited’ interval, in …

Persistent link: https://www.econbiz.de/10011062623

Asymmetric dynamics and critical behavior in the Bak–Sneppen model

Garcia, Guilherme J.M.; Dickman, Ronald - In: Physica A: Statistical Mechanics and its Applications 342 (2004) 3, pp. 516-528

extremal dynamics. …

Persistent link: https://www.econbiz.de/10010874555

Wealth redistribution in our small world

Iglesias, J.R.; Gonçalves, S.; Pianegonda, S.; Vega, J.L. - In: Physica A: Statistical Mechanics and its Applications 327 (2003) 1, pp. 12-17

We present a simplified model for the exploitation of resources by interacting agents, in an economy with small-world properties. It is shown that Gaussian distributions of wealth, with some cutoff at a poverty line are present for all values of the parameters, while the frequency of maxima and...

Persistent link: https://www.econbiz.de/10010589224

Wealth redistribution with conservative exchanges

Pianegonda, S; Iglesias, J.R; Abramson, G; Vega, J.L - In: Physica A: Statistical Mechanics and its Applications 322 (2003) C, pp. 667-675

random fraction of the available resources. An extremal dynamics ensures that the poorest agent has a chance to change its …

Persistent link: https://www.econbiz.de/10010590196