Skip to main content

Research Repository

Advanced Search

All Outputs (147)

Experimental validation of binary collisions between wave fragments in the photosensitive Belousov–Zhabotinsky reaction (2009)
Journal Article
Toth, R., Stone, C., Adamatzky, A., de Lacy Costello, B., & Bull, L. (2009). Experimental validation of binary collisions between wave fragments in the photosensitive Belousov–Zhabotinsky reaction. Chaos, Solitons and Fractals, 41(4), 1605-1615. https://doi.org/10.1016/j.chaos.2008.07.001

Using the examples of an excitable chemical system (the Belousov–Zhabotinsky medium) and plasmodium of Physarum polycephalum we show that universal computation in a geometrically unconstrained medium is only possible when resources (excitability or c... Read More about Experimental validation of binary collisions between wave fragments in the photosensitive Belousov–Zhabotinsky reaction.

Experimental validation of binary collisions between wave fragments in the photosensitive Belousov-Zhabotinsky reaction (2009)
Journal Article
Toth, R., Stone, C., Adamatzky, A., de Lacy Costello, B., & Bull, L. (2009). Experimental validation of binary collisions between wave fragments in the photosensitive Belousov-Zhabotinsky reaction. Chaos, Solitons and Fractals, 41(4), 1605-1615. https://doi.org/10.1016/j.chaos.2008.07.001

We present experimental verification of wave fragment collisions in the sub-excitable Belousov-Zhabotinsky medium observed previously in simulation [Adamatzky A, De Lacy Costello B. Binary collisions between wave fragments in a sub-excitable Belousov... Read More about Experimental validation of binary collisions between wave fragments in the photosensitive Belousov-Zhabotinsky reaction.

Evolution of cellular automata with memory: The Density Classification Task (2009)
Journal Article
Stone, C., & Bull, L. (2009). Evolution of cellular automata with memory: The Density Classification Task. BioSystems, 97(2), 108-116. https://doi.org/10.1016/j.biosystems.2009.05.001

The Density Classification Task is a well known test problem for two-state discrete dynamical systems. For many years researchers have used a variety of evolutionary computation approaches to evolve solutions to this problem. In this paper, we invest... Read More about Evolution of cellular automata with memory: The Density Classification Task.

On dynamical genetic programming: Random boolean networks in learning classifier systems (2009)
Journal Article
Bull, L., & Preen, R. (2009). On dynamical genetic programming: Random boolean networks in learning classifier systems. Lecture Notes in Artificial Intelligence, 5481 LNCS, 37-48. https://doi.org/10.1007/978-3-642-01181-8_4

Many representations have been presented to enable the effective evolution of computer programs. Turing was perhaps the first to present a general scheme by which to achieve this end. Significantly, Turing proposed a form of discrete dynamical system... Read More about On dynamical genetic programming: Random boolean networks in learning classifier systems.

Spiral formation and degeneration in heterogeneous excitable media (2009)
Journal Article
Toth, R., De Lacy Costello, B., Stone, C., Masere, J., Adamatzky, A., & Bull, L. (2009). Spiral formation and degeneration in heterogeneous excitable media. Physical Review E, 79(3), 035101(R) (4 pages). https://doi.org/10.1103/PhysRevE.79.035101

Spontaneous spiral formation occurs when an excitation wave is input to a heterogeneous network of low- and high-light-intensity cells projected onto a light-sensitive Belousov-Zhabotinsky reaction. The range of network conditions where spirals form... Read More about Spiral formation and degeneration in heterogeneous excitable media.

Implementation of glider guns in the light-sensitive Belousov-Zhabotinsky medium (2009)
Journal Article
De Lacy Costello, B., Toth, R., Stone, C., Adamatzky, A., & Bull, L. (2009). Implementation of glider guns in the light-sensitive Belousov-Zhabotinsky medium. Physical Review E, 79(2), 026114. https://doi.org/10.1103/PhysRevE.79.026114

In cellular automata models a glider gun is an oscillating pattern of nonquiescent states that periodically emits traveling localizations (gliders). The glider streams can be combined to construct functionally complete systems of logical gates and th... Read More about Implementation of glider guns in the light-sensitive Belousov-Zhabotinsky medium.

On minimally coupled boolean networks (2009)
Journal Article
Alonso-Sanz, R., & Bull, L. (2009). On minimally coupled boolean networks. International Journal of Bifurcation and Chaos, 19(04), 1401-1414. https://doi.org/10.1142/S0218127409023743

Traditional Boolean networks consist of nodes within a single network, each updating synchronously, although asynchronous versions have also been presented. In this paper the dynamics of two, mutually coupled traditional networks are investigated. In... Read More about On minimally coupled boolean networks.

Configuring ZCS for continuous-valued single-step Boolean problems (2009)
Journal Article
Stone, C., & Bull, L. (2009). Configuring ZCS for continuous-valued single-step Boolean problems. Analysis, 2(3), 19

In this paper we investigate the performance and operation of a Learning Classifier System on problems with real-valued states and a Boolean action space. Specifically, we study aspects of the algorithm and parameter set of the simple strength-based... Read More about Configuring ZCS for continuous-valued single-step Boolean problems.

Phase clustering in globally coupled photochemical oscillators (2008)
Journal Article
Taylor, A. F., Kapetanopoulos, P., Whitaker, B. J., Toth, R., Bull, L., & Tinsley, M. R. (2008). Phase clustering in globally coupled photochemical oscillators. European Physical Journal - Special Topics, 165(1), 137-149. https://doi.org/10.1140/epjst/e2008-00857-9

We experimentally investigate the formation of clusters in a population of globally coupled photochemical oscillators. The system consists of catalytic micro-particles in Belousov-Zhabotinsky solution and the coupling exploits the excitatory properti... Read More about Phase clustering in globally coupled photochemical oscillators.

Dynamic control and information processing in the Belousov-Zhabotinsky reaction using a coevolutionary algorithm (2008)
Journal Article
Toth, R., Stone, C., Adamatzky, A., De Lacy Costello, B., & Bull, L. (2008). Dynamic control and information processing in the Belousov-Zhabotinsky reaction using a coevolutionary algorithm. Journal of Chemical Physics, 129(18), 184708. https://doi.org/10.1063/1.2932252

We propose that the behavior of nonlinear media can be controlled dynamically through coevolutionary systems. In this study, a light-sensitive subexcitable Belousov-Zhabotinsky reaction is controlled using a heterogeneous cellular automaton. A checke... Read More about Dynamic control and information processing in the Belousov-Zhabotinsky reaction using a coevolutionary algorithm.

Learning classifier systems in data mining: An introduction (2008)
Journal Article
Bernadó-Mansilla, E., Bull, L., & Holmes, J. (2008). Learning classifier systems in data mining: An introduction. Studies in Computational Intelligence, 125, 1-15. https://doi.org/10.1007/978-3-540-78979-6_1

This chapter provides an introduction to Learning Classifier Systems before reviewing a number of historical uses in data mining. An overview of the rest of the volume is then presented. © 2008 Springer-Verlag Berlin Heidelberg.

Foreign exchange trading using a learning classifier system (2008)
Journal Article
Stone, C., & Bull, L. (2008). Foreign exchange trading using a learning classifier system. Studies in Computational Intelligence, 125, 169-189. https://doi.org/10.1007/978-3-540-78979-6_8

We apply a simple Learning Classifier System to a foreign exchange trading problem. The performance of the Learning Classifier System is compared to that of a Genetic Programming approach from the literature. The simple Learning Classifier System is... Read More about Foreign exchange trading using a learning classifier system.