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HG Schuster

Publications and source records attributed to HG Schuster.

18 recordsLinked to original sources
PubMed2000

1/f(alpha) noise from self-organized critical models with uniform driving

Using the well-known Olami-Feder-Christensen model as our paradigm, we show how to modify uniform driven self-organized critical models to generate 1/f(alpha) noise. This model can reproduce all the main features of 1/f(alpha) noise: (1) alpha is close to one and does not depend on the dimension of the system. (2) The 1/f(alpha) behavior is found for very low frequencies. (3) The spatial correlations do not obey a power law. That proves that spatially extended systems based on activation-deactivation processes do not have to be point-driven to produce 1/f(alpha) noise. The essential ingredient is a local memory of the activation-deactivation process.

Journal Article↗
PubMed1998

Extending the Iterated Prisoner's Dilemma without Synchrony.

In biology altruistic behaviour of selfish individuals often can be modelled by the iterated Prisoner's Dilemma game (PD). If the opponents are caught repeatedly in this dilemma reciprocity may lead to cooperative strategies adopted by the individuals. In this article we present results from numerical simulations of the infinitely iterated stochastic alternating PD. First we investigate influences of the memory size on strategies in the alternating two player PD. We show that Firm but Fair is a strong strategy hardly affected by memory size and different values of the temptation to defect. Second we discuss successful strategies in the alternating N player N step memory PD. In this situation we focus on the stability of cooperative strategies and compare the results to experiments of predator inspection by sticklebacks carried out by Milinski and co-workers.Copyright 1998 Academic Press Limited

Journal Article↗