Filamentary extension of the mem-con theory of memristance and its application to titanium dioxide sol-gel memristors (2012)
Working Paper
Gale, E., de Lacy Costello, B., & Adamatzky, A. Filamentary extension of the mem-con theory of memristance and its application to titanium dioxide sol-gel memristors. Bristol

Titanium dioxide sol-gel memristors have two different modes of operation, believed to be dependent on whether there is bulk memristance, i.e. memristance throughout the whole volume or filamentary memristance, i.e. memristance caused by the connecti... Read More about Filamentary extension of the mem-con theory of memristance and its application to titanium dioxide sol-gel memristors.

The effect of electrode size on memristor properties: an experimental and theoretical study (2012)
Working Paper
Gale, E., de Lacy Costello, B., & Adamatzky, A. The effect of electrode size on memristor properties: an experimental and theoretical study. Bristol

The width of the electrodes is not included in the current phenomenological models of memristance, but is included in the memory-conservation (mem-con) theory of memristance. An experimental study of the effect of changing the top electrode width was... Read More about The effect of electrode size on memristor properties: an experimental and theoretical study.

Evolution of supershapes for the generation of three-dimensional designs (2012)
Journal Article
Preen, R. J., & Bull, L. (2012). Evolution of supershapes for the generation of three-dimensional designs

This paper explores the evolution of three-dimensional objects with a simple generative encoding, known as the Superformula. Evolving three-dimensional objects has long been of interest in a wide array of disciplines, from engineering (e.g., robotics... Read More about Evolution of supershapes for the generation of three-dimensional designs.

Cartesian genetic programming for memristive logic circuits (2012)
Journal Article
Howard, G. D., Bull, L., & Adamatzky, A. (2012). Cartesian genetic programming for memristive logic circuits. Lecture Notes in Artificial Intelligence, 7244 LNCS, 37-48. https://doi.org/10.1007/978-3-642-29139-5_4

In this paper memristive logic circuits are evolved using Cartesian Genetic Programming. Graphs comprised of implication logic (IMP) nodes are compared to more ubiquitous NAND circuitry on a number of logic circuit problems and a robotic control task... Read More about Cartesian genetic programming for memristive logic circuits.

Using genetical and cultural search to design unorganised machines (2012)
Journal Article
Bull, L. (2012). Using genetical and cultural search to design unorganised machines. Evolutionary Intelligence, 5(1), 23-33. https://doi.org/10.1007/s12065-011-0061-4

In 1948 Turing presented a general representation scheme by which to achieve artificial intelligence-his unorganised machines. Significantly, these were a form of discrete dynamical system and yet dynamical representations remain almost unexplored wi... Read More about Using genetical and cultural search to design unorganised machines.

Emergence of self-organized amoeboid movement in a multi-agent approximation of Physarum polycephalum (2012)
Journal Article
Jones, J., & Adamatzky, A. (2012). Emergence of self-organized amoeboid movement in a multi-agent approximation of Physarum polycephalum. Bioinspiration and Biomimetics, 7(1), 016009. https://doi.org/10.1088/1748-3182/7/1/016009

The giant single-celled slime mould Physarum polycephalum exhibits complex morphological adaptation and amoeboid movement as it forages for food and may be seen as a minimal example of complex robotic behaviour. Swarm computation has previously been... Read More about Emergence of self-organized amoeboid movement in a multi-agent approximation of Physarum polycephalum.

On natural genetic engineering: structural dynamism in random boolean networks (2012)
Journal Article
Bull, L. (2012). On natural genetic engineering: structural dynamism in random boolean networks

This short paper presents an abstract, tunable model of genomic structural change within the cell lifecycle and explores its use with simulated evolution. A well-known Boolean model of genetic regulatory networks is extended to include changes in nod... Read More about On natural genetic engineering: structural dynamism in random boolean networks.

Evolving boolean networks with structural dynamism (2012)
Journal Article
Bull, L. (2012). Evolving boolean networks with structural dynamism. Artificial Life, 18(4), 385-397. https://doi.org/10.1162/ARTL_a_00073

This short article presents an abstract, tunable model of genomic structural change within the cell life cycle and explores its use with simulated evolution. A well-known Boolean model of genetic regulatory networks is extended to include changes in... Read More about Evolving boolean networks with structural dynamism.

A simple computational cell: Coupling boolean gene and protein networks (2012)
Journal Article
Bull, L. (2012). A simple computational cell: Coupling boolean gene and protein networks. Artificial Life, 18(2), 223-236

This article presents an abstract, tunable model containing two of the principal information-processing features of cells and explores its use with simulated evolution. The random Boolean model of genetic regulatory networks is extended to include a... Read More about A simple computational cell: Coupling boolean gene and protein networks.

Towards physarum engines (2012)
Journal Article
Tsuda, S., Jones, J., & Adamatzky, A. (2012). Towards physarum engines. Applied Bionics and Biomechanics, 9(3), 221-240. https://doi.org/10.3233/ABB-2012-0059

The slime mould Physarum polycephalum is a suitable candidate organism for soft-matter robotics because it exhibits controllable transport, movement and guidance behaviour. Physarum may be considered as a smart computing and actuating material since... Read More about Towards physarum engines.

Towards an intelligent distributed conveyor (2012)
Journal Article
Georgilas, I., Adamatzky, A., & Melhuish, C. (2012). Towards an intelligent distributed conveyor. Lecture Notes in Artificial Intelligence, 7429, 457-458

Manipulation, orientation and handling of components, subparts and finished products is an essential element of any industrial process, which attracts substantial portion of resources and infrastructure. A classic manipulation, e.g. robot arms, is no... Read More about Towards an intelligent distributed conveyor.

Computing with liquid crystal fingers: Models of geometric and logical computation (2011)
Journal Article
Younger, D., Matranga, M. A., Kitson, S., Adamatzky, A., & de Lacy Costello, B. (2011). Computing with liquid crystal fingers: Models of geometric and logical computation. Physical Review E, 84(6), https://doi.org/10.1103/PhysRevE.84.061702

When a voltage is applied across a thin layer of cholesteric liquid crystal, fingers of cholesteric alignment can form and propagate in the layer. In computer simulation, based on experimental laboratory results, we demonstrate that these cholesteric... Read More about Computing with liquid crystal fingers: Models of geometric and logical computation.

Influences on the formation and evolution of Physarum polycephalum inspired emergent transport networks (2011)
Journal Article
Jones, J. (2011). Influences on the formation and evolution of Physarum polycephalum inspired emergent transport networks. Natural Computing, 10(4), 1345-1369. https://doi.org/10.1007/s11047-010-9223-z

Biology and computing (2011)
Presentation / Conference
Gale, E. (2011, November). Biology and computing. Presented at Faculty Research Colloquium, University of the West of England, Bristol, UK

Memristors, the recently discovered 4th fundamental circuit element, have been used as models for biological components, such as neurons. It may be that neurons are memristors, rather than just conveniently modeled by them. This presentation covers r... Read More about Biology and computing.

On computing in fine-grained compartmentalised Belousov-Zhabotinsky medium (2011)
Journal Article
Adamatzky, A., Holley, J., Bull, L., & De Lacy Costello, B. (2011). On computing in fine-grained compartmentalised Belousov-Zhabotinsky medium. Chaos, Solitons and Fractals, 44(10), 779-790. https://doi.org/10.1016/j.chaos.2011.03.010

We introduce results of computer experiments on information processing in a hexagonal array of vesicles filled with Belousov-Zhabotinsky (BZ) solution in a sub-excitable mode. We represent values of Boolean variables by excitation wave-fragments and... Read More about On computing in fine-grained compartmentalised Belousov-Zhabotinsky medium.

Problemáticas en las búsquedas de información por internet con fines académicos / Issues searching Internet information for academic purposes (2011)
Presentation / Conference
Sánchez Moreno, A. D. L. P., & Martinez, G. J. (2011, September). Problemáticas en las búsquedas de información por internet con fines académicos / Issues searching Internet information for academic purposes. Paper presented at I Congreso Internacional De Educación Universitaria Y Prácticas Educativas Innovadoras, Instituto Politécnico Nacional, Mexico

En el presente artículo se analizan parte de las problemáticas que existen cuando se realizan búsquedas de fuentes de información en internet con fines escolares y académicos; particularmente, nos enfocamos a las dificultades que presentan los estud... Read More about Problemáticas en las búsquedas de información por internet con fines académicos / Issues searching Internet information for academic purposes.

Towards a mapping of modern AIS and LCS (2011)
Journal Article
Bull, L. (2011). Towards a mapping of modern AIS and LCS. Lecture Notes in Artificial Intelligence, 6825 LNCS, 371-382. https://doi.org/10.1007/978-3-642-22371-6_32

For many years correlations between aspects of Artificial Immune Systems (AIS) and Learning Classifier Systems (LCS) have been highlighted. However, neither field appears to have benefitted from such work not least since the differences between the t... Read More about Towards a mapping of modern AIS and LCS.

Vesicle computers: Approximating a Voronoi diagram using Voronoi automata (2011)
Journal Article
Adamatzky, A., De Lacy Costello, B., Holley, J., Gorecki, J., & Bull, L. (2011). Vesicle computers: Approximating a Voronoi diagram using Voronoi automata. Chaos, Solitons and Fractals, 44(7), 480-489. https://doi.org/10.1016/j.chaos.2011.01.016

Irregular arrangements of vesicles filled with excitable and precipitating chemical systems are imitated by Voronoi automata - finite-state machines defined on a planar Voronoi diagram. Every Voronoi cell takes four states: resting, excited, refracto... Read More about Vesicle computers: Approximating a Voronoi diagram using Voronoi automata.

Aluminium electrodes effect the operation of titanium oxide sol-gel memristors (2011)
Working Paper
Gale, E., Pearson, D., Kitson, S., Adamatzky, A., & de Lacy Costello, B. Aluminium electrodes effect the operation of titanium oxide sol-gel memristors. Bristol

By a comparison between memristors made with aluminium and gold electrodes, this letter demonstrates that aluminium electrodes are an essential component of the TiO$_2$ sol-gel flexible memristor . Both slow varying `analogue' and sudden switching `d... Read More about Aluminium electrodes effect the operation of titanium oxide sol-gel memristors.

The missing magnetic flux in the HP memristor found (2011)
Working Paper
Gale, E. The missing magnetic flux in the HP memristor found. Bristol

Ever since real-world two terminal memristor devices were created, detractors have derided them as not `true' Chua memristors because there is no magnetic flux in the system. This report shows that the flux is present and equal to the magnetic flux o... Read More about The missing magnetic flux in the HP memristor found.