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Manipulation with heterogeneity within a species population formulated as an inverse problem

Horváth, D.; Brutovsky, B.; Kočišová, J.; Šprinc, S. - In: Physica A: Statistical Mechanics and its Applications 389 (2010) 21, pp. 5028-5036

within the frame of evolutionary optimization theory. As the causal relation between the heterogeneity and dynamics of …

Persistent link: https://www.econbiz.de/10011063135

Inverse problem for multivariate time series using dynamical latent variables

Zamparo, M.; Stramaglia, S.; Banavar, J.R.; Maritan, A. - In: Physica A: Statistical Mechanics and its Applications 391 (2012) 11, pp. 3159-3169

Factor analysis is a well known statistical method to describe the variability among observed variables in terms of a smaller number of unobserved latent variables called factors. While dealing with multivariate time series, the temporal correlation structure of data may be modeled by including...

Persistent link: https://www.econbiz.de/10010589010

Optimization of highway networks and traffic forecasting

Schadschneider, Andreas; Knospe, Wolfgang; Santen, Ludger; … - In: Physica A: Statistical Mechanics and its Applications 346 (2005) 1, pp. 165-173

also discuss an analysis of the highway network in Germany to identify bottlenecks and possible optimization strategies. …

Persistent link: https://www.econbiz.de/10010871670

Optimal traffic networks topology: A complex networks perspective

Wu, Jian-Jun; Gao, Zi-You; Sun, Hui-jun - In: Physica A: Statistical Mechanics and its Applications 387 (2008) 4, pp. 1025-1032

We investigate and analyse an optimal traffic network structure for resisting traffic congestion with different volumes of traffic. For this aim, we introduce a cost function and user-equilibrium assignment (UE) which ensures the flow balance on traffic systems. Our finding is that an optimal...

Persistent link: https://www.econbiz.de/10010871687

The Hamming distance in the minority game

D'hulst, R; Rodgers, G.J - In: Physica A: Statistical Mechanics and its Applications 270 (1999) 3, pp. 514-525

We investigate different versions of the minority game, a toy model for agents buying and selling a commodity. The Hamming distance between the strategies used by agents to make decisions is introduced as an analytical tool to determine several properties of these models. The success rate of the...

Persistent link: https://www.econbiz.de/10010664807

Search-space smoothing for combinatorial optimization problems

Schneider, Johannes; Dankesreiter, Markus; Fettes, Werner; … - In: Physica A: Statistical Mechanics and its Applications 243 (1997) 1, pp. 77-112

Commonly there are two types of local search approaches known to treat combinatorial optimization problems with very …

Persistent link: https://www.econbiz.de/10011062527

The efficiency of individual optimization in the conditions of competitive growth

Kočišová, J.; Horváth, D.; Brutovský, B. - In: Physica A: Statistical Mechanics and its Applications 388 (2009) 17, pp. 3585-3592

agent’s individual optimization process. Steady-state simulations yield phase diagrams with the high and low competition … anomaly in the optimization efficiency. …

Persistent link: https://www.econbiz.de/10011063365

Hysteretic optimization for the traveling salesman problem

Pál, Károly F. - In: Physica A: Statistical Mechanics and its Applications 329 (2003) 1, pp. 287-297

Hysteretic optimization is a recently proposed heuristic optimization method inspired by the demagnetization of … optimization problems works reasonably well for the traveling salesman problem. We propose an improvement for the general scheme. …

Persistent link: https://www.econbiz.de/10011064040

Hysteretic optimization for the Sherrington–Kirkpatrick spin glass

Pál, Károly F. - In: Physica A: Statistical Mechanics and its Applications 367 (2006) C, pp. 261-268

Hysteretic optimization is a heuristic optimization method based on the observation that magnetic samples are driven … optimization is very good for finding ground states of Sherrington–Kirkpatrick spin glass systems. With this method it is possible … way we estimate error rates may be useful for some other optimization methods as well. Our results show that both the …

Persistent link: https://www.econbiz.de/10011064197

Optimizing partitions of percolating graphs

Boettcher, Stefan - In: Physica A: Statistical Mechanics and its Applications 266 (1999) 1, pp. 100-103

The partitioning of random graphs is investigated numerically using “simulated annealing” and “extremal optimization …”. While generally in an NP-hard problem, it is shown that the optimization of the graph partitions is particularly difficult … “simulated annealing” is found to diverge in the thermodynamic limit. On the other hand, “extremal optimization”, a new general …

Persistent link: https://www.econbiz.de/10011064489