Stephen Dignum

Research Student (PhD)

University of Essex, Colchester, CO4 3SQ, United Kingdom

Supervisor: Professor Riccardo Poli

Research Interests:

Artificial Intelligence, Knowledge Representation, Search, Evolutionary Computation, Genetic Programming

Conference Papers:

Riccardo Poli, William B. Langdon, and Stephen Dignum. On the limiting distribution of program sizes in tree-based genetic programming. In Marc Ebner, Michael O’Neill, Anik´o Ek´art, Leonardo Vanneschi, and Anna Isabel Esparcia-Alc´azar, editors, Proceedings of the 10th European Conference on Genetic Programming, volume 4445 of Lecture Notes in Computer Science, pages 193–204, Valencia, Spain, 11 – 13 April 2007. Springer. Winner of Best Paper Award.

Stephen Dignum and Riccardo Poli. Generalisation of the limiting distribution of program sizes in tree-based genetic programming and analysis of its effects on Bloat. In Dirk Thierens, Hans-Georg Beyer, Josh Bongard, Jurgen Branke, John Andrew Clark, Dave Cliff, Clare Bates Congdon, Kalyanmoy Deb, Benjamin Doerr, Tim Kovacs, Sanjeev Kumar, Julian F. Miller, Jason Moore, Frank Neumann, Martin Pelikan, Riccardo Poli, Kumara Sastry, Kenneth Owen Stanley, Thomas Stutzle, Richard A Watson, and Ingo Wegener, editors, GECCO ’07: Proceedings of the 9^th Annual Conference on Genetic and Evolutionary Computation, volume 2, pages 1588–1595, London, 7-11 July 2007. ACM Press. Nominated for Best Paper in Track.

Stephen Dignum and Riccardo Poli. Operator Equalisation and Bloat Free GP. In Michael O’Neill, Leonardo Vanneschi, Steven Gustafson, Anna Isabel Esparcia-Alc´azar, Ivanoe De Falco, Antonio Della Cioppa, Ernesto Tarantino, editors, Proceedings of the 11th European Conference on Genetic Programming, volume 4971 of Lecture Notes in Computer Science, pages 110-121, Naples, Italy, 26 – 28 March 2008. Springer. Nominated for Best Paper.

Stephen Dignum and Riccardo Poli. Crossover, Sampling, Bloat and the Harmful Effects of Size Limits. In Michael O’Neill, Leonardo Vanneschi, Steven Gustafson, Anna Isabel Esparcia-Alc´azar, Ivanoe De Falco, Antonio Della Cioppa, Ernesto Tarantino, editors, Proceedings of the 11th European Conference on Genetic Programming, volume 4971 of Lecture Notes in Computer Science, pages 158-169, Naples, Italy, 26 – 28 March 2008. Springer.

Edgar Galv´an-L´opez, Stephen Dignum, and Riccardo Poli. The Effects of Constant Neutrality on Performance and Problem Hardness in GP. In Michael O’Neill, Leonardo Vanneschi, Steven Gustafson, Anna Isabel Esparcia-Alc´azar, Ivanoe De Falco, Antonio Della Cioppa, Ernesto Tarantino, editors, Proceedings of the 11th European Conference on Genetic Programming, volume 4971 of Lecture Notes in Computer Science, pages 312-324, Naples, Italy, 26 – 28 March 2008. Springer.

Stephen Dignum and Riccardo Poli. Sub-Tree Swapping Crossover, Allele Diffusion and GP Convergence. In G. Rudolph, editor, Proceedings of the 10th International Conference on Parallel Problem Solving from Nature, volume 5199 of Lecture Notes in Computer Science, pages 368-377, Dortmund, Germany, 13 – 17 September 2008. Springer.

Workshop Papers:

Stephen Dignum. An Analysis of Genetic Programming Operator Bias regarding the Sampling of Program Size with Potential Applications. EvoPhD 2008, Naples, Italy, March 27^th, Chairs: Jano Van Hemert, Mario Giacobini, Cecilia Di Chio. Winner of Best Paper Award.

Academic Qualifications:

MSc (Distinction) Computer Science (Artificial Intelligence and Agents), University of Essex

BSc Hons (2:1) Computing and Informatics, University of Plymouth