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Adaptation, Noise, and Self-Organizing Systems papers

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Amplifying Phenomenal Information: Toward a Fundamental Theory of Consciousness
Fundamental approaches bypass the problem of getting consciousness from non-conscious components by positing that consciousness is a universal primitive. For example, the double aspect theory of…
L. GaboraOct 30, 2002
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Cumulant Dynamics of a Population under Multiplicative Selection, Mutation and Drift
We revisit the classical population genetics model of a population evolving under multiplicative selection, mutation and drift. The number of beneficial alleles in a multi-locus system can be…
Magnus Rattray, Jonathan L. ShapiroJun 5, 2001
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A microsimulation of traders activity in the stock market: the role of heterogeneity, agents' interactions and trade frictions
We propose a model with heterogeneous interacting traders which can explain some of the stylized facts of stock market returns. In the model synchronization effects, which generate large fluctuations…
Giulia IoriJul 25, 2000
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Number-conserving cellular automaton rules
A necessary and sufficient condition for a one-dimensional q-state n-input cellular automaton rule to be number-conserving is established. Two different forms of simpler and more visual…
Nino Boccara, Henryk FuksMay 17, 2000
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The Importance of Being Discrete - Life Always Wins on the Surface
Many systems in chemistry, biology, finance and social sciences present emerging features which are not easy to guess from the elementary interactions of their microscopic individual components. In…
Nadav M. Shnerb, Yoram Louzoun, Eldad Bettelheim et al.Dec 29, 1999
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Fitness versus Longevity in Age-Structured Population Dynamics
We examine the dynamics of an age-structured population model in which the life expectancy of an offspring may be mutated with respect to that of the parent. While the total population of the system…
W. Hwang, P. L. Krapivsky, S. RednerDec 16, 1999
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Democracy versus Dictatorship in Self-Organized Models of Financial Markets
Models to mimic the transmission of information in financial markets are introduced. As an attempt to generate the demand process, we distinguish between dictatorship associations, where groups of…
R. d'Hulst, G. J. RodgersDec 15, 1999
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Physicists attempt to scale the ivory towers of finance
Physicists have recently begun doing research in finance, and even though this movement is less than five years old, interesting and useful contributions have already emerged. This article reviews…
J. Doyne FarmerDec 10, 1999
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Frontiers of finance: Evolution and efficient markets
In this review article we explore several recent advances in the quantitative modeling of financial markets. We begin with the Efficient Markets Hypothesis and describe how this controversial idea…
J. Doyne Farmer, Andrew W. LoDec 8, 1999
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Modelling Collective Opinion Formation by Means of Active Brownian Particles
The concept of active Brownian particles is used to model a collective opinion formation process. It is assumed that individuals in community create a two-component communication field that…
Frank Schweitzer, Janusz HolystNov 25, 1999
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Modelling Migration and Economic Agglomeration with Active Brownian Particles
We propose a stochastic dynamic model of migration and economic aggregation in a system of employed (immobile) and unemployed (mobile) agents which respond to local wage gradients. Dependent on the…
Frank SchweitzerNov 24, 1999
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Criticality and Punctuated Equilibrium in a Spin System Model of a Financial Market
We describe a financial market model which shows a non-equilibrium phase transition. Near the transition punctuated equilibrium behaviour is seen, with avalanches occuring on all scales. This scaling…
A. Ponzi, Y. AizawaNov 19, 1999
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Mathematical description of the heat transfer in living tissue (Part II)
In the present monograph we formulate a simple model for heat transfer in living tissue with self - regulation. The initial point of the model is the governing equations describing heat transfer in…
I. A. Lubashevsky, V. V. GafiychukNov 1, 1999
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Mathematical description of the heat transfer in living tissue (Part I)
In the present monograph we formulate a simple model for heat transfer in living tissue with self - regulation. The initial point of the model is the governing equations describing heat transfer in…
I. A. Lubashevsky, V. V. GafiychukNov 1, 1999
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Simple models of evolution and extinction
This article gives a brief introduction to the mathematical modeling of large-scale biological evolution and extinction. We give three examples of simple models in this field: the coevolutionary…
M. E. J. NewmanOct 18, 1999
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A Simple Model of the Evolution of Simple Models of Evolution
In the spirit of the many recent simple models of evolution inspired by statistical physics, we put forward a simple model of the evolution of such models. Like its objects of study, it is (one…
Cosma Rohilla Shalizi, William A. TozierOct 15, 1999
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Fractal Analysis for Social Systems
This is a brief introduction to fractals, multifractals and wavelets in an accessible way, in order that the founding ideas of those strange and intriguing newcomers to science as fractals may be…
C. M. ArizmendiOct 14, 1999
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Self-Organized Criticality: Self-Organized Complexity? The Disorder and ``Simple Complexity'' of Power Law Distributions
The disorder and a simple convex measure of complexity are studied for rank ordered power law distributions, indicative of criticality, in the case where the total number of ranks is large. It is…
J. S. ShinerSep 22, 1999
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Performance of data networks with random links
We investigate simplified models of computer data networks and examine how the introduction of additional random links influences the performance of these net works. In general, the impact of…
Henryk Fuks, Anna T. LawniczakSep 21, 1999
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Beyond Hebb: Exclusive-OR and Biological Learning
A learning algorithm for multilayer neural networks based on biologically plausible mechanisms is studied. Motivated by findings in experimental neurobiology, we consider synaptic averaging in the…
Konstantin Klemm, Stefan Bornholdt, Heinz Georg SchusterSep 15, 1999
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Measuring Mutual Information in Random Boolean Networks
During the last few years an area of active research in the field of complex systems is that of their information storing and processing abilities. Common opinion has it that the most interesting…
Bartolo Luque, Antonio FerreraSep 3, 1999
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Analysis of the optimality principles responsible for vascular network architectonics
The equivalence of two optimality principles leading to Murray's law has been discussed. The first approach is based on minimization of biological work needed for maintaining the blood flow…
I. A. Lubashevsky, V. V. GafiychukSep 1, 1999
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Social Percolation
We introduce the simplest model which relates the emergence of collective social/economic phenomena to the existence of a (possibly self-organized) percolation transition. We suggest a series of…
Sorin Solomon, Gerard WeisbuchAug 28, 1999
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Statistical measures of complexity for strongly interacting systems
In recent studies, new measures of complexity for nonlinear systems have been proposed based on probabilistic grounds, as the LMC measure (Phys. Lett. A 209 (1995) 321) or the SDL measure…
Ricard V. Sole, Bartolo LuqueAug 27, 1999
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Colective Effects from Induced Behaviour
We present a solvable model for describing quantitatively situations where the individual behaviour of agents in a group "percolates" to collective behaviour of the group as a whole as a…
I. -O. Stamatescu, T. T. WuAug 24, 1999
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