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***** To join INSNA, visit http://www.insna.org ***** Barry Wellman _______________________________________________________________________ S.D. Clark Professor of Sociology, FRSC NetLab Director Department of Sociology 725 Spadina Avenue, Room 388 University of Toronto Toronto Canada M5S 2J4 twitter:barrywellman http://www.chass.utoronto.ca/~wellman fax:+1-416-978-3963 Updating history: http://chass.utoronto.ca/oldnew/cybertimes.php _______________________________________________________________________ Promotion of cooperation induced by nonuniform payoff allocation in spatial public goods game , Eur. Phys. J. B Abstract: A nonuniform payoff allocation mechanism is proposed for spatial public goods games where individuals are nodes on a scale-free network. Each individual is assigned a weight kiα, where ki is the degree of individual i and α is an adjustable parameter that controls the degree of diversity in individuals' profits. During the evolution progress, the allocation of payoff on individual i is assumed to be proportional to its weight. Individuals synchronously update their strategies according to the stochastic rule with a fixed noise level. It is found that there exists an optimal value of Î ± which yields the highest level of cooperation. Other pertinent quantities, including the payoff and the probability of finding a node playing as cooperator versus the degree, are also investigated computationally and analytically. Our results suggest that a suitable degree of diversity among individuals can promote the emergence of cooperation. * [18] Promotion of cooperation induced by nonuniform payoff allocation in spatial public goods game, D. Peng, H.-X. Yang, W.-X. Wang, G. R. Chen and B.-H. Wang, 2010/01/15, DOI: 10.1140/epjb/e2010-00008-7, Eur. Phys. J. B [18] http://dx.doi.org/10.1140/epjb/e2010-00008-7 _________________________________________________________________ Optimal Synchronization in Space , arXiv Excerpt: In this Rapid Communication we investigate spatially constrained networks that realize optimal synchronization properties. After arguing that spatial constraints can be imposed by limiting the amount of `wire' available to connect nodes distributed in space, we use numerical optimization methods to construct networks that realize different trade-offs between optimal synchronization and spatial constraints. * [19] Optimal Synchronization in Space, Markus Brede, 2010/01/, arXiv:1001.4921 [19] http://arXiv.org/abs/1001.4921 _____________________________________________________________________ SOCNET is a service of INSNA, the professional association for social network researchers (http://www.insna.org). To unsubscribe, send an email message to [log in to unmask] containing the line UNSUBSCRIBE SOCNET in the body of the message.