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Adaptation, Noise, and Self-Organizing Systems papers — page 2

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Models of Extinction: A Review
We review recent work aimed at modeling species extinction over geological time. We discuss a number of models which, rather than dealing with the direct causes of particular extinction events,…
M. E. J. Newman, R. G. PalmerAug 6, 1999
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A Complete Enumeration and Classification of Two-Locus Disease Models
There are 512 two-locus, two-allele, two-phenotype, fully-penetrant disease models. Using the permutation between two alleles, between two loci, and between being affected and unaffected, one model…
Wentian Li, Jens ReichAug 5, 1999
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Phase Transition in Random Networks with Multiple States
The critical boundaries separating ordered from chaotic behavior in randomly wired S-state networks are calculated. These networks are a natural generalization of random Boolean nets and are proposed…
Ricard V. Sole, Bartolo Luque, Stuart KauffmanJul 23, 1999
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Scaling in a Multispecies Network Model Ecosystem
A new model ecosystem consisting of many interacting species is introduced. The species are connected through a random matrix with a given connectivity. It is shown that the system is organized close…
Ricard V. Sole, David Alonso, Alan McKaneJul 23, 1999
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Autoregressive model of 1/f noise
An analytically solvable model is proposed exhibiting 1/f spectrum in any desirably wide range of frequency (but excluding the point f=0). The model consists of pulses whose recurrence times obey an…
B. KaulakysJul 23, 1999
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Resource Sharing and Coevolution in Evolving Cellular Automata
Evolving one-dimensional cellular automata (CAs) with genetic algorithms has provided insight into how improved performance on a task requiring global coordination emerges when only local…
Justin Werfel, Melanie Mitchell, James P. CrutchfieldJul 23, 1999
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Nondecay probability of a metastable state: almost exact analytical description in wide range of noise intensity
This paper presents a complete description of noise-induced decay of a metastable state in a wide range of noise intensity. Recurrent formulas of exact moments of decay time valid for arbitrary noise…
Svetlana P. Nikitenkova, Andrey L. PankratovJul 21, 1999
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Functional Dynamics I : Articulation Process
The articulation process of dynamical networks is studied with a functional map, a minimal model for the dynamic change of relationships through iteration. The model is a dynamical system of a…
N. Kataoka, K. KanekoJul 20, 1999
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Functional Dynamics II : Syntactic Structure
Functional dynamics, introduced in a previous paper, is analyzed, focusing on the formation of a hierarchical rule to determine the dynamics of the functional value. To study the periodic (or…
N. Kataoka, K. KanekoJul 20, 1999
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A dynamical model of non regulated markets
The main focus of this work is to understand the dynamics of non regulated markets. The present model can describe the dynamics of any market where the pricing is based on supply and demand. It will…
Andreas SchaaleJul 15, 1999
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Strategy Selection in the Minority Game
We investigate the dynamics of the choice of an active strategy in the minority game. A history distribution is introduced as an analytical tool to study the asymmetry between the two choices offered…
R. D'Hulst, G. J. RodgersJul 14, 1999
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Metastable Evolutionary Dynamics: Crossing Fitness Barriers or Escaping via Neutral Paths?
We analytically study the dynamics of evolving populations that exhibit metastability on the level of phenotype or fitness. In constant selective environments, such metastable behavior is caused by…
Erik van Nimwegen, James P. CrutchfieldJul 2, 1999
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Lyapunov Exponents in Random Boolean Networks
A new order parameter approximation to Random Boolean Networks (RBN) is introduced, based on the concept of Boolean derivative. A statistical argument involving an annealed approximation is used,…
Bartolo Luque, Ricard V. SoleJun 30, 1999
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Model of self-replicating cell capable of self-maintenance
We construct a simple model of a proto-cell that simulates a stochastic dynamics of abstract chemicals on a two-dimensional lattice. We assume that chemicals catalyze their reproduction through…
Naoaki Ono, Takashi IkegamiJun 25, 1999
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Noise-induced breakdown of coherent collective motion in swarms
We consider swarms formed by populations of self-propelled particles with attractive long-range interactions. These swarms represent multistable dynamical systems and can be found either in coherent…
A. S. Mikhailov, D. H. ZanetteJun 7, 1999
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An Exactly Soluble Hierarchical Clustering Model: Inverse Cascades, Self-Similarity, and Scaling
We show how clustering as a general hierarchical dynamical process proceeds via a sequence of inverse cascades to produce self-similar scaling, as an intermediate asymptotic, which then truncates at…
A. Gabrielov, W. I. Newman, D. L. TurcotteJun 4, 1999
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Minimum Energy Information Fusion in Sensor Networks
In this paper we consider how to organize the sharing of information in a distributed network of sensors and data processors so as to provide explanations for sensor readings with minimal expenditure…
George ChaplineJun 3, 1999
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Evolution in Minority Games II. Games with Variable Strategy Spaces
We continue our study of evolution in minority games by examining games in which agents with poorly performing strategies can trade in their strategies for new ones from a different strategy space.…
Yi Li, Rick Riolo, Robert SavitMay 28, 1999
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Globally coupled bistable elements as a model of group decision making
A simple mathematical model is proposed to study the effect of the average trend of a population on the opinion of each individual, when a group decision has to be made by voting. It is shown that if…
Damian H. ZanetteMay 18, 1999
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Noise-induced memory in extended excitable systems
We describe a form of memory exhibited by extended excitable systems driven by stochastic fluctuations. Under such conditions, the system self-organizes into a state characterized by power-law…
Dante R. Chialvo, Guillermo A. Cecchi, Marcelo O. MagnascoMay 4, 1999
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Extremal Coupled Map Lattices
We propose a model for co-evolving ecosystems that takes into account two levels of description of an organism, for instance genotype and phenotype. Performance at the macroscopic level forces…
Guillermo Abramson, Jose Luis VegaApr 30, 1999
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Lattice three-species models of the spatial spread of rabies among foxes
Lattice models describing the spatial spread of rabies among foxes are studied. In these models, the fox population is divided into three-species: susceptible, infected or incubating, and infectious…
A. Benyoussef, N. Boccara, H. Chakib et al.Apr 20, 1999
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A Mathematical Model with Modified Logistic Approach for Singly-Peaked Population Processes
When a small number of individuals of organism of single species is confined in a closed space with limited amount of indispensable resources, their breading may start initially under suitable…
Ryoitiro Huzimura, Toyoki MatsuyamaApr 19, 1999
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Evolution dynamics in terraced NK landscapes
We study populations of agents evolving in fitness landscapes constructed according to the rules of a modified NK model with a tunable amount of neutral paths. In the `punctuated equilibrium'…
Paolo Sibani, Andreas PedersenApr 16, 1999
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Three sided complex adaptative systems
We introduce two three sided adaptative systems as toy models to mimic the exchange of commodities between buyers and sellers. These models are simple extensions of the minority game, exhibiting…
R. D'hulst, G. J. RodgersApr 12, 1999
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