Reaction-diffusion navigation robot control: From chemical to VLSI analogic processors (2004)
Journal Article
Rodríguez-Vázquez, A., De Lacy Costello, B., Carmona-Galán, R., Arena, P., Adamatzky, A., Basile, A., …Frasca, M. (2004). Reaction-diffusion navigation robot control: From chemical to VLSI analogic processors. IEEE Transactions on Circuits and Systems I: Regular Papers, 51(5), 926-938. https://doi.org/10.1109/TCSI.2004.827654

We introduce a new methodology and experimental implementations for real-time wave-based robot navigation in a complex, dynamically changing environment. The main idea behind the approach is to consider the robot arena as an excitable medium, in whic... Read More about Reaction-diffusion navigation robot control: From chemical to VLSI analogic processors.

Prediction calculation in accuracy-based neural learning classifier systems (2004)
Report
O'Hara, T., & Bull, L. (2004). Prediction calculation in accuracy-based neural learning classifier systems

Voronoi diagrams generated by regressing edges of precipitation fronts (2004)
Journal Article
Hantz, P., de Lacy Costello, B., & Ratcliffe, N. M. (2004). Voronoi diagrams generated by regressing edges of precipitation fronts. Journal of Chemical Physics, 120(5), 2413-2416. https://doi.org/10.1063/1.1635358

The Voronoi diagram generated by regression edges of precipitation fronts was analyzed. In the reaction-diffusion system, one of the reagents penetrates into a gel by diffusion and forms a precipitate with the other reagent homogenized in the gel. It... Read More about Voronoi diagrams generated by regressing edges of precipitation fronts.

The formation of voronoi diagrams in chemical and physical systems: Experimental findings and theoretical models (2004)
Journal Article
Purwins, H. G., de Lacy Costello, B., Ratcliffe, N. M., Adamatzky, A., Zanin, A. L., & Liehr, A. W. (2004). The formation of voronoi diagrams in chemical and physical systems: Experimental findings and theoretical models. International Journal of Bifurcation and Chaos, 14(7), 2187-2210. https://doi.org/10.1142/S021812740401059X

The work discusses the formation of Voronoi diagrams in spatially extended nonlinear systems taking experimental and theoretical results into account. Concerning experimental systems a number of chemical systems used previously as prototype chemical... Read More about The formation of voronoi diagrams in chemical and physical systems: Experimental findings and theoretical models.

Finite time extinction in nonlinear diffusion equations (2004)
Journal Article
Beardmore, R. E., Peplow, A. T., & Laister, R. (2004). Finite time extinction in nonlinear diffusion equations. Applied Mathematics Letters, 17(5), 561-567. https://doi.org/10.1016/S0893-9659%2804%2990126-7

We consider a class of degenerate diffusion equations where the nonlinearity is assumed to be singular (non-Lipschitz) at zero. It is shown that solutions with compactly supported initial data become identically zero in finite time. Such extinction f... Read More about Finite time extinction in nonlinear diffusion equations.

Sequential and continuum bifurcations in degenerate elliptic equations (2004)
Journal Article
Beardmore, R. E., & Laister, R. (2004). Sequential and continuum bifurcations in degenerate elliptic equations. Proceedings of the American Mathematical Society, 132(01), 165-174. https://doi.org/10.1090/S0002-9939-03-06979-X

We examine the bifurcations to positive and sign-changing solutions of degenerate elliptic equations. In the problems we study, which do not represent Fredholm operators, we show that there is a critical parameter value at which an infinity of bifurc... Read More about Sequential and continuum bifurcations in degenerate elliptic equations.

Applications of learning classifier systems (2004)
Book
Bull, L. (2004). Applications of learning classifier systems. Springer

Learning classifier systems: A brief introduction (2004)
Book Chapter
Bull, L. (2004). Learning classifier systems: A brief introduction. In L. Bull (Ed.), Applications of Learning Classifier Systems (1-12). Springer Berlin/Heidelberg. https://doi.org/10.1007/978-3-540-39925-4_1

A simple payoff-based learning classifier system (2004)
Journal Article
Bull, L. (2004). A simple payoff-based learning classifier system

Towards distributed adaptive control for road traffic junction signals using learning classifier systems (2004)
Book Chapter
Bull, L., Sha’Aban, J., Tomlinson, A., Addison, J. D., & Heydecker, B. G. (2004). Towards distributed adaptive control for road traffic junction signals using learning classifier systems. In L. Bull (Ed.), Applications of Learning Classifier Systems (276-299). Springer Berlin/Heidelberg. https://doi.org/10.1007/978-3-540-39925-4_12

Fuzzy XCS: An accuracy-based fuzzy classifier system (2004)
Journal Article
Casillas, J., Carse, B., & Bull, L. (2004). Fuzzy XCS: An accuracy-based fuzzy classifier system

Using genetic programming for feature creation with a genetic algorithm feature selector (2004)
Journal Article
Smith, M. G., & Bull, L. (2004). Using genetic programming for feature creation with a genetic algorithm feature selector. Lecture Notes in Artificial Intelligence, 3242, 1163-1171. https://doi.org/10.1007/978-3-540-30217-9_117

The use of machine learning techniques to automatically analyse data for information is becoming increasingly widespread. In this paper we primarily examine the use of Genetic Programming and a Genetic Algorithm to preprocess data before it is classi... Read More about Using genetic programming for feature creation with a genetic algorithm feature selector.

Applying XCSR to Design-Oriented Environments (2004)
Report
Wyatt, D., Bull, L., & Parmee, I. C. (2004). Applying XCSR to Design-Oriented Environments

Building compact rulesets for describing continuous-valued problem spaces using a learning classifier system (2004)
Book Chapter
Wyatt, D., Bull, L., & Parmee, I. (2004). Building compact rulesets for describing continuous-valued problem spaces using a learning classifier system. In I. Parmee (Ed.), Adaptive Computing in Design and Manufacture VI (235-248). Springer

Trajectories of a DAE near a pseudo-equilibrium (2004)
Journal Article
Beardmore, R. E., Laister, R., & Peplow, A. (2004). Trajectories of a DAE near a pseudo-equilibrium. Nonlinearity, 17(1), 253-279. https://doi.org/10.1088/0951-7715/17/1/015

We consider a class of differential-algebraic equations (DAEs) defined by analytic nonlinearities and study its singular solutions. The main assumption used is that the linearization of the DAE represents a Kronecker index-2 matrix pencil and that th... Read More about Trajectories of a DAE near a pseudo-equilibrium.

Nodes: An environment for simulating self-replicating machines (2004)
Book Chapter
Stevens, W. (2004). Nodes: An environment for simulating self-replicating machines. In J. B. Pollack, M. Bedau, P. Husbands, T. Ikegami, & R. A. Watson (Eds.), Proceedings of the Ninth International Conference on the Simulation and Synthesis of Living Systems (39-44). MIT Press

A simulation framework is described in which a collection of particles moving in continuous two-dimensional space can be put together to build machines. A self replicating machine has been designed in this environment. It is proposed that an env... Read More about Nodes: An environment for simulating self-replicating machines.

The synthesis of novel 3-substituted pyrrole monomers possessing chiral side groups: A study of their chemical polymerisation and the assessment of their chiral discrimination properties (2003)
Journal Article
de Lacy Costello, B., Ratcliffe, N. M., & Sivanand, P. S. (2003). The synthesis of novel 3-substituted pyrrole monomers possessing chiral side groups: A study of their chemical polymerisation and the assessment of their chiral discrimination properties. Synthetic Metals, 139(1), 43-55. https://doi.org/10.1016/S0379-6779%2802%2901247-X

Novel 3-substituted pyrrole monomers possessing chiral side groups were synthesised. These compounds were successfully polymerised with ferric salts and the polymer materials fabricated into sensors. The sensors were found to elicit differential chan... Read More about The synthesis of novel 3-substituted pyrrole monomers possessing chiral side groups: A study of their chemical polymerisation and the assessment of their chiral discrimination properties.

Experimental reaction-diffusion chemical processors for robot path planning (2003)
Journal Article
Adamatzky, A., de Lacy Costello, B., Ratcliffe, N. M., & Melhuish, C. (2003). Experimental reaction-diffusion chemical processors for robot path planning. Journal of Intelligent and Robotic Systems, 37(3), 233-249. https://doi.org/10.1023/A%3A1025414424756

In this paper we discuss the experimental implementation of a chemical reaction-diffusion processor for robot motion planning in terms of finding the shortest collision-free path for a robot moving in an arena with obstacles. These reaction-diffusion... Read More about Experimental reaction-diffusion chemical processors for robot path planning.

Thick film organic vapour sensors based on binary mixtures of metal oxides (2003)
Journal Article
Ewen, R. J., de Lacy Costello, B., Ratcliffe, N. M., & Sivanand, P. S. (2003). Thick film organic vapour sensors based on binary mixtures of metal oxides. Sensors and Actuators B: Chemical, 92(1-2), 159-166. https://doi.org/10.1016/S0925-4005%2803%2900258-2

Previously, composite sensors incorporating differing proportions of tin dioxide and zinc oxide were reported which exhibited high sensitivity to a range of organic vapours under dry conditions (0% relative humidity, RH). Most importantly, the compos... Read More about Thick film organic vapour sensors based on binary mixtures of metal oxides.

A neural learning classifier system with self-adaptive constructivism (2003)
Presentation / Conference
Bull, L., & Hurst, J. (2003, June). A neural learning classifier system with self-adaptive constructivism. Paper presented at The 2003 Congress on Evolutionary Computation