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Adaptation, Noise, and Self-Organizing Systems papers — page 6

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Evolution and extinction dynamics in rugged fitness landscapes
Macroevolution is considered as a problem of stochastic dynamics in a system with many competing agents. Evolutionary events (speciations and extinctions) are triggered by fitness records found by…
Paolo Sibani, Michael Brandt, Preben AlstroemOct 6, 1997
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The Measure of Compositional Heterogeneity in DNA Sequences Is Related to Measures of Complexity
This commentary discusses a recently proposed measure of heterogeneity of DNA sequences and compares with the measures of complexity.
Wentian LiOct 1, 1997
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Analysis, Synthesis, and Estimation of Fractal-Rate Stochastic Point Processes
Fractal and fractal-rate stochastic point processes (FSPPs and FRSPPs) provide useful models for describing a broad range of diverse phenomena, including electron transport in amorphous…
Stefan Thurner, Steven B. Lowen, Markus C. Feurstein et al.Sep 30, 1997
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Conservation laws in coupled multiplicative random arrays lead to 1/f noise
We consider the dynamic evolution of a coupled array of N multiplicative random variables. The magnitude of each is constrained by a lower bound w0 and their sum is conserved. Analytical calculation…
Stefan Thurner, Markus C. Feurstein, Malvin C. TeichSep 30, 1997
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Coevolution of membranes and channels: A possible step in the origin of life
We propose a scenario for the origin of life based on the coevolution of lipid bilayer vesicles and protein channels.
Saint Clair Cemin, Lee SmolinSep 27, 1997
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Classifying Rational Densities Using Two One-Dimensional Cellular Automata
Given a (finite) string of zeros and ones, we report a way to determine if the number of ones is less than, greater than, or equal to a prescribed number by applying two sets of cellular automaton…
H. F. Chau, K. K. Yan, K. Y. Wan et al.Sep 9, 1997
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Search for an unitary mortality law through a theoretical model for biological ageing
In this work we check the occurrence of the Azbel assumption of mortality within the framework of a bit string model for biological ageing. We reproduced the observed feature of linear correspondence…
A. Racco, M. Argollo de Menezes, T. J. P. PennaSep 4, 1997
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Theoretical approach to biological aging
We present a model for biological aging that considers the number of individuals whose (inherited) genetic charge determines the maximum age for death: each individual may die before that age due to…
R. M. C. de Almeida, S. Moss de Oliveira, T. J. P. PennaSep 3, 1997
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High-Speed Network Traffic Management Analysis and Optimization: Models and Methods
The main steps of automatic control methodology include the hierarchical representation of management system and the formal definitions of input variables, object and goal of control of each…
V. Zaborovski, S. Yegorov, Y. Podgurski et al.Aug 20, 1997
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Emergence of Cooperation and Organization in an Evolutionary Game
A binary game is introduced and analysed. N players have to choose one of the two sides independently and those on the minority side win. Players uses a finite set of ad hoc strategies to make their…
Damien Challet, Yi-Cheng ZhangAug 19, 1997
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Dynamics controlled by additive noise
Analysis is presented of a system whose dynamics are dramatically simplified by tiny amounts of additive noise. The dynamics divide naturally into two phases. In the slower phase, trajectories are…
G. D. LytheAug 11, 1997
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Symmetry Breaking and Adaptation: Evidence from a Toy Model of a Virus
We argue that the phenomenon of symmetry breaking in genetics can enhance the adaptability of a species to changes in the environment. In the case of a virus, the claim is that the codon bias in the…
J. Mora, C. Stephens, H. WaelbroeckAug 6, 1997
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Codon Bias and Mutability in HIV Sequences
A survey of the patterns of synonymous codon preferences in the HIV env gene reveals a relation between the codon bias and the mutability requirements in different regions in the protein. At…
H. WaelbroeckAug 6, 1997
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Self-Adaptation in Evolving Systems
A theoretical and experimental analysis is made of the effects of self-adaptation in a simple evolving system. Specifically, we consider the effects of coding the mutation and crossover probabilities…
C. Stephens, I. Garcia, J. Mora et al.Aug 6, 1997
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Emergence of Algorithmic Languages in Genetic Systems
In genetic systems there is a non-trivial interface between the sequence of symbols which constitutes the chromosome, or ``genotype'', and the products which this sequence encodes --- the…
O. Angeles, C. Stephens, H. WaelbroeckAug 6, 1997
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A noise-controlled dynamic bifurcation
We consider a slow passage through a point of loss of stability. If the passage is sufficiently slow, the dynamics are controlled by additive random disturbances, even if they are extremely small. We…
G. D. LytheJul 31, 1997
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Noise and dynamic transitions
A parabolic stochastic PDE is studied analytically and numerically, when a bifurcation parameter is slowly increased through its critical value. The aim is to understand the effect of noise on…
G. D. LytheJul 31, 1997
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Learning from Mistakes
A simple model of self-organised learning with no classical (Hebbian) reinforcement is presented. Synaptic connections involved in mistakes are depressed. The model operates at a highly adaptive,…
Dante R. Chialvo, Per BakJul 28, 1997
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Coherence and clustering in ensembles of neural networks
Large ensembles of globally coupled chaotic neural networks undergo a transition to complete synchronization for high coupling intensities. The onset of this fully coherent behavior is preceded by a…
D. H. Zanette, A. S. MikhailovJul 22, 1997
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Condensation in Globally Coupled Populations of Chaotic Dynamical Systems
The condensation transition, leading to complete mutual synchronization in large populations of globally coupled chaotic Roessler oscillators, is investigated. Statistical properties of this…
D. H. Zanette, A. S. MikhailovJul 22, 1997
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Stochastic calculus: application to dynamic bifurcations and threshold crossings
For the dynamic pitchfork bifurcation in the presence of white noise, the statistics of the last time at zero are calculated as a function of the noise level and the rate of change of the parameter.…
Kalvis M. Jansons, G. D. LytheJul 16, 1997
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Random Neighbor Theory of the Olami-Feder-Christensen Earthquake Model
We derive the exact equations of motion for the random neighbor version of the Olami-Feder-Christensen earthquake model in the infinite-size limit. We solve them numerically, and compare with…
Hans-Martin Broeker, Peter GrassbergerJul 11, 1997
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Noise and slow-fast dynamics in a three-wave resonance problem
Recent research on the dynamics of certain fluid dynamical instabilities shows that when there is a slow invariant manifold subject to fast timescale instability the dynamics are extremely sensitive…
G. D. Lythe, M. R. E. ProctorJun 29, 1997
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Domain formation in transitions with noise and time-dependent bifurcation parameter
The characteristic size for spatial structure, that emerges when the bifurcation parameter in model partial differential equations is slowly increased through its critical value, depends…
G. D. LytheJun 26, 1997
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The Bak-Chen-Tang Forest Fire Model Revisited
We reconsider a model introduced by Bak, Chen, and Tang (Phys. Rev. A 38, 364 (1988)) as a supposedly self-organized critical model for forest fires. We verify again that the model is not critical in…
Hans-Martin Bröker, Peter GrassbergerJun 23, 1997
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