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Adaptation, Noise, and Self-Organizing Systems papers — page 10

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Pattern Formation and Functionality in Swarm Models
We explore a simplified class of models we call swarms, which are inspired by the collective behavior of social insects. We perform a mean-field stability analysis and perform numerical simulations…
Erik M. Rauch, Mark M. Millonas, Dante R. ChialvoJul 18, 1995
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The Instability of Markets
Recent developments in the global liberalization of equity and currency markets, coupled to advances in trading technologies, are making markets increasingly interdependent. This increased fluidity…
Tad Hogg, Bernardo A. Huberman, Michael YoussefmirJul 13, 1995
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Word Processors with Line-Wrap: Cascading, Self-Organized Criticality, Random Walks, Diffusion, Predictability
We examine the line-wrap feature of text processors and show that adding characters to previously formatted lines leads to the cascading of words to subsequent lines and forms a state of…
Wolfgang Bauer, Scott PrattJul 7, 1995
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Chromosome mapping: radiation hybrid data and stochastic spin models
This work approaches human chromosome mapping by developing algorithms for ordering markers associated with radiation hybrid data. Motivated by recent work of Boehnke et al. [1], we formulate the…
C. T. Falk, H. FalkJul 6, 1995
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Self-Organization in Models of Populations with Two-Parent Reproduction on a Rugged Fitness Landscape
The two-parent reproduction model of Derrida and Peliti is simulated on a rugged fitness landscape. Fixed fitness values for each possible genotype are assigned randomly, with all fit individuals…
Jan FinjordJun 26, 1995
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Kolmogorov turbulence in a random-force-driven Burgers equation
The dynamics of velocity fluctuations, governed by the one-dimensional Burgers equation, driven by a white-in-time random force with the spatial spectrum |f(k)|2-1, is…
Alexei Chekhlov, Victor YakhotJun 23, 1995
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How birds fly together: Long-range order in a two-dimensional dynamical XY model
We propose a non-equilibrium continuum dynamical model for the collective motion of large groups of biological organisms (e.g., flocks of birds, slime molds, etc.) Our model becomes highly…
Yuhai Tu, John TonerJun 8, 1995
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Ground State Structure in a Highly Disordered Spin Glass Model
We propose a new Ising spin glass model on Zd of Edwards-Anderson type, but with highly disordered coupling magnitudes, in which a greedy algorithm for producing ground states is exact. We find…
C. M. Newman, D. L. SteinMay 31, 1995
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Hydrodynamic effects in density waves of granular flows
Granular flows in a narrow pipe are studied numerically by the model taking account of hydrodynamic effects of fluid surrounding particles. In the simulations density waves are observed over the wide…
Kengo IchikiMay 29, 1995
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Exact Results for Spatio-Temporal Correlations in a Self-Organized Critical Model of Punctuated Equilibrium
We introduce a self-organized critical model of punctuated equilibrium with many internal degrees of freedom (M) per site. We find exact solutions for M→ ∞ of cascade equations…
Stefan Boettcher, Maya PaczuskiMay 28, 1995
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Evolutionary Dynamics and Optimization: Neutral Networks as Model-Landscapes for RNA Secondary-Structure Folding-Landscapes
We view the folding of RNA-sequences as a map that assigns a pattern of base pairings to each sequence, known as secondary structure. These preimages can be constructed as random graphs (i.e. the…
Christian V. Forst, Christian Reidys, Jacqueline WeberMay 26, 1995
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A Statistical Approach to Vehicular Traffic
A two--dimensional cellular automaton is introduced to model the flow and jamming of vehicular traffic in cities. Each site of the automaton represents a crossing where a finite number of cars can…
Jan Freund, Thorsten PöschelMay 21, 1995
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The Distributed Genetic Algorithm Revisited
This paper extends previous work done by Tanese on the distributed genetic algorithm (DGA). Tanese found that the DGA outperformed the canonical serial genetic algorithm (CGA) on a class of…
Theodore C. BeldingMay 4, 1995
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Hierarchical Crossover and Probability Landscapes of Genetic Operators
The time evolution of a simple model for crossover is discussed. A variant of this model with an improved exploration behavior in phase space is derived as a subset of standard one- and multi-point…
Stefan Bornholdt, Heinz Georg SchusterApr 28, 1995
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Hydrodynamic Description of Granular Convection
We present a hydrodynamic model that captures the essence of granular dynamics in a vibrating bed. We carry out the linear stability analysis and uncover the instability mechanism that leads to the…
Hisao Hayakawa, Su Yue, Daniel C. HongApr 21, 1995
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Numerical investigation of surface level instability due to tube in vibrating bed of powder
Surface level instability when tube is injected into vibrating bed of powder, which was originally found in experiments, is investigated numerically. We find that thicker (thiner) tube makes surface…
Yasushi Maeno, Dr. Y-h. TaguchiApr 17, 1995
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Elements of a Theory of Simulation
Unlike computation or the numerical analysis of differential equations, simulation does not have a well established conceptual and mathematical foundation. Simulation is an arguable unique union of…
Steen Rasmussen, Christopher BarrettApr 10, 1995
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Evolution of Cooperation, Differentiation, Complexity, and Diversity in an Iterated Three-person Game
A non-zero-sum 3-person coalition game is presented, to study the evolution of complexity and diversity in cooperation, where the population dynamics of players with strategies is given according to…
Eizo Akiyama, Kunihiko KanekoApr 10, 1995
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A Theory of Differentiation with Dynamic Clustering
A novel theory for cell differentiation is proposed, based on simulations with interacting artificial cells which have metabolic networks within, and divide into two when the final product is…
Kunihiko Kaneko, Tetsuya YomoApr 4, 1995
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Abundance Distributions in Artificial Life and Stochastic Models: "Age and Area" revisited
Using an artificial system of self-replicating strings, we show a correlation between the age of a genotype and its abundance that reflects a punctuated rather than gradual picture of evolution, as…
C. Adami, C. T. Brown, M. HaggertyMar 29, 1995
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Strong Ordering by Non-uniformity of Thresholds in a Coupled Map Lattice
The coupled map lattice by Olami et al. [Phys. Rev. Lett. 68, 1244 (1992)] is ``doped'' by letting just one site have a threshold, T* max, bigger than the others.…
Frode Torvund, Jan FroylandMar 29, 1995
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Comment on "Linguistic Features of Noncoding DNA Sequences"
In a recent Physical Review Letter, Mantegna et. al., report that certain statistical signatures of natural language can be found in non-coding DNA sequences. In this comment we show that random…
N. E. Israeloff, M. Kagalenko, K. ChanMar 18, 1995
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Self-Organized Critical Models Without Local Particle Conservation Laws On Superlattices
We consider simple examples of self-organized critical systems on one-dimensional superlattices without local particle conservation laws. The set of all recurrence states are also found in these…
H. F. ChauMar 7, 1995
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Clustered Volatility in Multiagent Dynamics
Large distributed multiagent systems are characterized by vast numbers of agents trying to gain access to limited resources in an unpredictable environment. Agents in these system continuously switch…
Michael Youssefmir, Bernardo HubermanMar 1, 1995
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Traffic at the Edge of Chaos
We use a very simple description of human driving behavior to simulate traffic. The regime of maximum vehicle flow in a closed system shows near-critical behavior, and as a result a sharp decrease of…
Nagel K, Rasmussen SFeb 15, 1995
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