Non-Hierarchichal Network Evolutionary System

April 5, 2010

NoHNES at Evostar Istanbul

Filed under: Congress — Tags: , , , — jjmerelo @ 6:37 pm

A substantial portion of the NoHNES teem will be in Istanbul attending the EvoStar 2010 conference. Paco Fernández, Daniel Lombraña, Anna Esparcia, Antonio Mora and myself will be there presenting two papers and one poster. My own presentation on an evolutionary MasterMind is already online, and the rest will be here shortly.
So, NoHNES will be at Evostar for the third time in a row (I talked about the first one in my other blog)


March 4, 2010

Project presentation at the IT Projects Day

Filed under: Congress, Event, Papers — Tags: , , , — jjmerelo @ 7:05 pm

Tomorrow lots of people in suits will be heading to Boadilla del Monte, in Madrid, to present their projects in a seminar in which project principal investigators will be talking about them. I am still thinking about the suit, but will be there to present this summary of our groups’ work. It’s been two quite productive years (and a half), but we have only twenty minutes to present them using this slide deck

Feel free to ask about or request any paper you see mentioned there. Most refer to ongoing research, anyways.

December 30, 2009

PhD thesis defense: “Modelling and simulation of laser dynamics with cellular automata on parallel and distributed computers”

On December 14, 2009, the NoHNES Project member José Luis Guisado Lizar successfully defended his PhD thesis, with the “Doctor Europaeus” mention, at the  Condensed Matter Physics Department of the Universidad de Sevilla. The thesis advisors were Dr. Francisco Jiménez Morales, from the Universidad de Sevilla, and Dr. Francisco Fernández de Vega, from the Universidad de Extremadura.

PhD thesis defense of José Luis Guisado.

The thesis Committee was comprised of Dr. Antonio Córdoba Zurita (Universidad de Sevilla), Dr. Marco Tomassini (Université de Lausanne, Suiza), Dr. Alfons Hoekstra (Universiteit van Amsterdam, Holanda), Dr. Juan Julián Merelo Guervós (Universidad de Granada) and Dr. Fernando Díaz del Río (Universidad de Sevilla).

The thesis introduces a new model for laser dynamics based on a bio-inspired cellular automata algorithm, and also analyses how to implement it efficiently on parallel and distributed computers.

Abstract: This thesis presents interdisciplinary research carried out in the areas of physics and computer science. We introduce a new model based on cellular automata (CA) to describe laser dynamics, which is an alternative to the standard description based on differential equations. We also study how to take advantage of the intrinsic parallel nature of CA to carry out high performance computational simulations with that model on parallel and distributed computers.

CA are a class of fully discrete, spatially-distributed dynamical systems characterized by local interaction and synchronous parallel dynamical evolution. Our CA-based model reproduces the main laser dynamics phenomenology. It reinforces the vision of laser as a complex system, since the macroscopic properties of the laser system emerge with this model as a cooperative phenomenon from elementary components that interact locally under simple rules. This model represents a new methodological approach for laser modelling, which can be advantageous in cases in which the differential equations are difficult or impossible to integrate, or not entirely applicable because the usual approximations are not valid. It also opens the door to new more detailed CA-based models that could capture more features of laser behaviour.

We investigate how to parallelize the model efficiently. A parallel implementation has been developed using the message passing paradigm. Its performance and scalability have been analysed for the two most usual kinds of platforms for this kind of applications: dedicated clusters, and heterogeneous non-dedicated clusters including a dynamic load balancing strategy. In the latter case a very flexible modular approach has been employed in which the model is executed on top of a dynamic load balancing tool. The results confirm that, in spite of potential difficulties, it is feasible to execute large, fine-grained simulations with CA-based models—including the laser model described—on the most usual types of cluster computing platforms with a good efficiency and scalability.

PhD thesis presentation slides.

More information:

Contact: jlguisado ‘at’ us ‘dot’ es

October 15, 2009

JICAN 2009 – Workshop on Computational Intelligence Applied to Business and Industry

On November 5 and 6 the Instituto Tecnologico de Informatica, Universidad Politecnica de Valencia, Spain organises JICAN 2009, the Workshop on Computational Intelligence Applied to Business.

This is a unique 2-day workshop exclusively devoted to real-world applications of CI, with the support of the Spanish Chapter of IEEE-Computational Intelligence Society.

The purpose of the workshop is twofold: on the one hand, to introduce this technology to companies in any area; on the other, to show actual fields of application to researchers in academia.
We are privileged to count on the participation of world leading experts in Computational Intelligence, who will present the latest developments in CI with a special focus on how it is used in real world business and industry applications (specifically in videogames, logistics, social networks, planning and scheduling…)..

The workshop is aimed at:

  • Companies: Project managers or directors (technical and non technical) who, as part of their work, face complex problems related to optimisation, prediction and decision making.
  • Academia: Researchers and students interested in the practical application of Computational Intelligence.

The languages of the Workshop are English and Spanish. Two-way simultaneous translation will be provided to those who require it.

See full programme here

July 20, 2009

Presentation of our work on modeling pheromone dispensers at GECCO workshop on Symbolic Regression and Modeling

Our paper “Multiobjective Genetic Programming Approach for a Smooth Modeling of the Release Kinetics of a Pheromone Dispenser” was presented at the workshop on Symbolic Regression and Modeling, part of the Genetic and Evolutionary Computation Conference, GECCO, held in Montreal, Canada, from July 8th ot 12th, 2009.

Here’s the abstract:
The accurate modeling of the release kinetics of pheromone dispensers is a matter or great importance for ensuring that the dispenser field-life covers the right period of the pest and for optimizing the layout of dispensers in the treated area.
A new experimental dispenser has been recently designed by researchers at the Instituto Agroforestal del Mediterraneo – Centro de Ecologia Quimica Agricola (CEQA) of the Universidad Politecnica de Valencia (Spain). The most challenging problem for the modeling of the release kinetics of this dispensers is the dificulty in obtaining experimental measurements for building the model. The procedure for obtaining these data is very costly, both time and money wise, therefore the available data across the whole season are scarce. In prior work we demonstrated the utility of using Genetic Programming (GP) for this particular problem. However, the models evolved by the GP algorithm tend to have discontinuities in those time ranges where there are not available measurements. In this work we propose the use of a multiobjective Genetic Programming for modeling the performance of the CEQA dispenser. We take two approaches, involving two and nine objectives respectively. In the first one, one of the objectives of the GP algorithm deals with how well the model fits the experimental data, while the second objective measures how “smooth” the model behaviour is. In the second approach we have as many objectives as data points and the aim is to predict each point separately using the remaining ones. The results obtained endorse the utility of this approach for those modeling problems characterized by the lack of experimental data.

May 25, 2009

Seminario “La IA en la adquisición y uso del conocimiento médico: Patrones Asistenciales”

Filed under: Computational Intelligence techniques, Real-world applications — anaismartinezg @ 3:34 pm

El Jueves 21 de Mayo de 2009 se celebró el seminario “La IA en la adquisición y uso del conocimiento médico: Patrones Asistenciales” en la ETSI Informática de la UNED. El seminario presentaba el proyecto HYGIA (TIN2006-15453), el cual integra el trabajo conjunto desarrollado por las universidades de Santiago de Compostela, Jaume I y Rovira i Virgili, y del Hospital Clínico de Barcelona en el ámbito de la utilización de técnicas de análisis automático de textos, ingeniería del conocimiento y aprendizaje automático inductivo para la generación de patrones asistenciales. Estos patrones formalizan el conocimiento terapéutico de una o varias enfermedades y son capaces de ser interpretados por sistemas informáticos de soporte a la toma de decisiones en medicina. En esta ponencia se presentó el trabajo y los resultados obtenidos en el análisis automático de textos médicos y en el aprendizaje inductivo de patrones a partir de las bases de datos hospitalarias.
La web oficial del proyecto es:

May 19, 2009

Presentation of the multikulti algorithm at CEC09

The Congress of Evolutionary Computation is one of the bigger and more prestigious conferences on, you guessed it, EC. Here are the slides for the talk Lourdes Araújo and myself will be presenting tomorrow.

The paper is available under request, but I guess it will be available shortly from IEEExplore. Here’s the abstract

Migration policies in distributed evolutionary algorithms are bound to have, as much as any other evolutionary operator, an impact on the overall performance. However, they have not been an active area of research until recently, and this research has concentrated on the migration rate. In this paper we compare different migration policies, including our proposed ‘multikulti’ methods, which choose the individuals that are going to be sent to other nodes based on the principle of ‘multiculturalism’: the individual sent should be as different as possible to the receiving population (represented in several possible ways). We have checked this policy on two discrete optimization problems for different number of nodes, and found that, in average or in median, multikulti policies outperform others like sending the best or a random individual; however, their advantage changes with the number of nodes involved and the difficulty of the problem. The success of this kind of policies will be explained via the measurement of entropies, which are known to have an impact in the performance of the evolutionary algorithm.

April 27, 2009

NoHNES presence at EvoStar 2009 in Tübingen

Filed under: Congress — annaesparcia @ 10:33 am

NoHNES members Anna Esparcia and Ken Sharman attended EvoStar 2009, the premier European event on Evolutionary Computation. Anna served as co-chair of EvoNUM (the 2nd European Workshop on Bio-inspired algorithms for continuous parameter optimisation) and EvoGAMES (the 1st European Workshop on Bio-inspired Algorithms in Games).

See some pictures here.


  • The tandem Ekart-Esparcia, so sucessful as chairs of EvoNUM, was also voted to chair EuroGP 2010, with Sara Silva as Publications Chair.
  • The 2010 edition of EvoStar will be held in Istanbul, Turkey, on April 7th to the 9th, with Sima Uyar as Local chair .
  • The EvoWorkshops will from now on be known as EvoApplications: The European Conference of Applications of Evolutionary Computing

April 24, 2009

Our work on modeling pheromone dispensers at EvoNUM 2009

Our work on modeling pheromone dispensers for sexual confusion in agricluture was presented by Anna Esparcia in the 2nd European workshop on Bio-inspired algorithms for continuous parameter optimisation, EvoNUM 2009, which is part of EvoStar 2009, the premier European event on Evolutionary Computation.

Although the presentation was scheduled at the ungodly hour of 10:30, the comments were higly favourable. As in the previous occasion where we have presented this work, the application was received with great interest, partly because computer scientists are in general unaware of where their food comes from.
However, unlike in MAEB 2009, this time we did not get what has become a memorable comment: “Us people from Madrid only go to the country to check that cows are in fact not purple”.

March 13, 2009

The Evolutionary Computation Congress Cycle

Filed under: Congress — jjmerelo @ 4:37 pm

There are three main EC conferences in the yearly calendar: GECCO, Genetic and Evolutionary Computation Conference, which takes place usually around July in far away places like Canada and London and is organized by the ACM, CEC, Congress on Evolutionary Computation, which also travels around the world but never gets close to Spain, takes place by the end of May/beginning of June, and then Evostar, which is mainly an European event, held in cozy places to an enthusiastic audience.
I’ve never been in CEC, just once in GECCO , and several times in Evostar. From a strictly personal point of view, Evostar is probably the best, but scientifically GECCO is tops, with 5-6 reviewers per paper, a very strong scientif committee, and usually quite interesting keynotes. Papers accepted in GECCO’s main tracks do undergo a reviewing process stronger than many conferences.
All this introduction is meant to say that our project will be this year in all the conferences in the cycle. We’ll be presenting a paper on CEQA at Evostar, our multikulti algorithm at CEC, and another paper on multikulti and a joint work with Christian Gagné at GECCO, as we recently knew yesterday.
So, if you’re attending any of these EC conferences this year, there will be somebody from this project. See you there!

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