Research Interests	Starting from Machine Learning and Data Mining I moved on to Multiagent Learning, Recommender Systems and Technologies for Knowledge Management Support, which in turn drew my attention to online knowledge sharing communities, then to how small networks structures arise from interaction between agents and, more recently, to the cultural aspects of knowledge sharing, socialization, the structure of virtual and real societies, innovation patterns and so on.
Research Projects	GridCat: the i2CAT Grid Platform of I2cat i2CAT: the Internet2 Project in Catalonia Laboranova, A Collaboration Environment for Strategic Innovation
Publications	2006 Pujol, J.M., Flache, A., Delgado, J. and Sangüesa, R. "How can Social Networks ever become Complex? Modeling the Emergence of Complex Networks from Local Social Exchanges". Journal of Artificial Societies and Social Simulation 8(4) (2005). Eduard Grasa, Sergi Figuerola, Joaquim Recio, Albert López, Marc de Palol, Lluis Ribes, Vicente Díaz, Ramon Sangüesa, Gabriel Junyent, Michel Savoie: Video transcoding in a Grid network with User Controlled LightPaths. Future Generation Comp. Syst. 22(8): 920-928 (2006) 2005 Pujol, J.M., Delgado, J., Sangüesa, R., and Flache, A. "The Role of Clustering on the Emergence of Efficient Social Conventions". Proceedings of the 19th International Joint Conference on Artificial Intelligence, IJCAI-05, (Edinburgh, Scotland), July 2005, pp 965-970, ISBN: 0-938075-93-4. 2004 J.M., Flache, A., Delgado, J. and Sangüesa, R. "The Emergence of Complex Networks through Local Optimization". In Proceedings of the XVI European Conference on Artificial Intelligence ECAI-04 (López de Mántaras,R. and Saitta,L. eds.,Valencia, Spain), pp. 48 - 52, IOS Press 2004.  Isaac Chao, Ramon Sangüesa and Oscar Ardaiz. Grid Resource Management using Software Agents. ERCIM News No. 59, October 2004 Isaac Chao, Ramon Sangüesa, Oscar Ardaiz: Design, Implementation, and Evaluation of a Resource Management Multiagent System for a Multimedia Processing Grid. OTM Workshops 2004: 187-197. Oscar Ardaiz, Kana Sanjeevan, Ramon Sangüesa: A 3-tier Grid Architecture and Interactive Applications Framework for Community Grids. International Conference on Computational Science 2004: 67-74 Pujol, J.M., Flache, A., Delgado, J. and Sangüesa, R. "The Emergence of Complex Exchange Networks". Accepted at the 24th International Sunbelt Social Network Conference (Portoroz, Slovenia), May 2004. 2003 Delgado, J., Pujol, J.M. and Sangüesa, R. "Emergence of Coordination in Scale-Free Networks". To appear in Web Intelligence and Agent Systems Journal (2003). Pujol, J.M., Sangüesa, R. and Delgado, J. "A Ranking Algorithm Based on Graph Topology to Generate Reputation or Relevance". In Web Intelligence (Ning Zhong, Jiming Liu, and Yiyu Yao eds.), ch 18, pp 382-395, Springer Verlag (2003), ISBN: 3-540-44384-3.  Pujol, J.M., Sangüesa, R. and Bermúdez, J. "Porqpine: A Distributed and Collaborative Search Engine". Poster at the The Twelfth International World Wide Web Conference WWW2003, Budapest, Hungary (2003). Pujol, J.M., Sangüesa, R. and Bermúdez, J. "Porqpine: A Peer-to-Peer Search Engine". Technical Report LSI-03-6-R., Universitat Politècnica de Catalunya (2003). 2002 Sangüesa, R. and Pujol, J.M. "NetExpert: Agent-based Expertise Location by Means of Social and Knowledge Networks." In Knowledge Management and Organizational Memories (Rose Dieng-Kuntz and Nada Matta, eds), ch 14, pp. 159-168, Kluwer Academic Publishers (2002). ISBN: 0-7923-7659-5. Pujol, J.M., Sangüesa, R. and Delgado, J. "Extracting Reputation in Multi Agent System by means of Social Network Topology". Proceedings of the First International Joint Conference on Autonomous Agents and Multi-Agent Systems AAMAS-02. Vol. 1, pp 467-474. Bologna, Italy (2002). Pujol, J.M., Sangüesa, R. and Delgado J. "Distributed and Adaptable Ranking Algorithm for Reputation and Relevance Extraction". Proceedings of the 5th Catalan Conference on Artificial Intelligence CCIA-02, pp 205-213, Castelló de la Plana, Spain, (2002).  2001 Sangüesa, R. and Pujol, J.M. "NetExpert: A multiagent system for expertise location". Internation Joint Conference on Artificial Intelligence (IJCAI) Workshop on Organizational Memories and Knowledge Management, pp. 85-93 ,Seattle, USA (2001)  Pujol, J.M., Sangüesa, R. "Reputation Measures based on Social Networks metrics for Multi Agents Systems". Proceedings of the 4th Catalan Conference on Artificial Intelligence CCIA-01, pp 205-213, Barcelona, Spain (2001). Previous work on Causal Network Learning and Recommender Agents Learning causal possibilistic networks from data PhD Thesis, Department of Software, Technical University of Catalonia (please request a copy by e-mail). R. Sangüesa, U. Cortés.Learning causal networks from data. a survey and a new algorithm for recovering possibilistic causal networks. AiCommunications,Vol 10,No. 1, March 1997, pages. 31-6. R. Sangüesa, U. Cortés and A. Gisolfi,A Parallel Algorithm for Building Possibilistic Causal Networks, International Journal of Approximate Reasoning, special issue on Algebraic models, MV-Algebras for Fuzzy Logic and Fuzzy Reasoning. R.Sangüesa and U. Cortés, Possibilistic Conditional independence: a similarity-based measure ant its application to causal network learning,International Journal of Approximate Reasoning. R. Sangüesa and J.CabósExperimentacion con metodos hibridos de aprendizaje de redes bayesianas,. Congreso Iberoamericano de Inteligencia Artificial, IBERAMIA-92, pages 310-319, Cholula, Puebla, Mexico.(zipped PS, 40 K). R.Sangüesa and U. Cortés Possibilistic Conditional Dependency, Similarity and Information Measures: an application to causal network recovery. Fuzzy Theory and Technologies, FTT'97, North Carolina, March 1997.(zipped PostScript, 44 K). Dependency discovery with POSSCAUSE: an Application to Waste Water Treatment Plants. (Zipped PostScript, 55 K). Proceedings of the first international Conference on The Practical Application of Knowledge Discovery and Data Mining (PADD97), London, April 1997, pages 199-214. Experiments with Domain Knowledge in Knowledge discovery. Proceedings of the first international Conference on The Practical Application of Knowledge Discovery and Data Mining (PADD97), London, April 1997, pages 65-78. Biasing Induction with Previous Knowledge for Knowledge Acquisition in Imprecise Domains. (Mario Martin, Ramón Sanguesa and Ulises Cortés). In Proceedings of the Eleventh International Workshop on Expert Systems & Their Applications (Avignon'91), Avignon, France Knowledge Acquisition Combining Analytical and Empirical Techniques. (Mario Martin, Ramón Sanguesa and Ulises Cortés). In Proceedings of the Eight International Workshop on Machine Learning (ML91). Editors: L.A. Birbaum, G.C. Collins. Published by Morgan-Kauffman. [Illinois (USA), 1991]. A New Approach to Knowledge Acquisition: Integrating Analytical and Empirical Techniques. (Mario Martin, Ramón Sanguesa). Proceedings of the ICYCS'91. [Beijing (China), 1991].LINNEO: A Knowledge Acquisition Tool (Angels Hernández, Mario Martin, Ramón Sanguesa and Ulises Cortés). Proceedings of the 2nd Paneuropean Simposium on Applied Informatic. [Salerno (Italia), 1990]. R.Sangüesa, U. Cortés, M. Nicolás, S.Saxon "Webprofile or agents the other way round" (WebAg.ps.Z,PostScript, compressed) R.Sangüesa,J. Vázquez, A. Vázquez "ACE: mixing cognitive and social filtering" ( LSI-Dept. Technical Report).   R. Sangüesa, and U. Cortés, The Bayesian Agent: a probabilistic agent for working under uncertainty. Vim Project Winter Workshop, November 1997, Ravello, Italy. (gzipped Postscript file)