Contact: Via Augusta, 177 08021, Barcelona. Spain jmps AT  tid DOT es solso AT Twitter

Biography

Researcher at the Internet Lab of Telefonica Research.

From 2006 to 2008 I was a post-doc at the Department of Epidemiology and the Center for the Study of Complex Systems at the University of Michigan.

Prior to that I was a member of the Knowledge Engineering and Learning Group (KEMLg) group in the Software Department (LSI) at the Technical University of Catalonia (Universitat Politècnica de Catalunya UPC). 

I obtained a PhD on Computer Science and Artificial Intelligence at the Technical University of Catalonia in 2006.  My PhD dissertation "Structure in Artificial Societies" was advised by Dr. Ramon Sangüesa and Dr. Jordi Delgado.

During my PhD I did an internship at the Interuniversity Center for Social Science Theory and Methodology (ICS) at the University of Groningen (RUG) as well as at the Information Dynamics Lab at Hewlett-Packard Labs.

In 2001 I earned a MSc in Computer Science at the Barcelona School of Informatics (FIB).

What's new

• Our paper "The Little Engine(s) that Could: Scaling Online Social Networks" made it to SIGCOMM 2010.
• Coorganizing the Social Mobile Web Workshop at the IEEE Social Computing Conference
• Porqpine is on alpha but alive. You're welcome to try it out and see how collaborative systems, social networks and p2p can be used to build a full-fledged search engine from scratch
• PC at SIGIR 2010
• PC at IDAR / SIGMOD 2010
• PC at CERI 2010

Research Interests:

• Social Networks
• Dynamics in networks (epidemics, diffusion, search, trust and reputation) 
• Collaborative systems (search, tagging, filtering, voting mechanisms)
• Unsupervised data-mining and clustering
• Open distributed systems (Multi-agent systems, Web services, p2p, on-line communities)

Recent Publications:

• Pujol, J.M., Erramilli, V., Siganos G., Yang, X., Laoutaris, N., Chhabra, P. and Rodriguez P. "The Little Engine(s) that Could: Scaling Online Social Networks", ACM/SIGCOMM 2010 [email for draft]

• Amatriain, X., Pujol, J.M. and Church, K. "Being Social: Research in Context-aware and Personalized Information Access @ Telefonica", SIGIR 2010 Industry Track.

• Pujol, J.M., Siganos, G., Erramilli, V. and Rodriguez, P. "Scaling Online Social Networks without Pains", Workshop on Networking Meets Databases (NetDB) in cooperation with SOSP 2009. [PDF]

• Pujol, J.M., Eisenberg, J.E., Haas, C.N. and Koopman, J.S."The Effect of Ongoing Exposure Dynamics in Dose Response Relationships", in PLOS Computational Biology 2009. [Online] 

• Amatriain, X., Lathia, N., Pujol, J.M., Kwak, H. and Oliver, N. "The Wisdom of the Few: A Collaborative Filtering Approach Based on Expert Opinions from the Web", Proceedings of SIGIR 2009. [PDF]

• Pujol, J.M. and Rodriguez, P. "Towards Distributed Social Search Engines", in WWW 2009 Developers Track. [Online]

• Amatriain, X. Jaimes, A. Oliver, N. and Pujol, J.M. "Data Mining Methods for Recommender Systems". in "Recommender Systems Handbook". Kantor, Ricci, Rokach, Shapira (Eds). Springer. 2009. (In press)

• Amatriain, X. Pujol, J.M, and Oliver, N. "I like It... I like It Not: Measuring Users Ratings Noise in Recommender Systems", Proceedings of UMAP 2009. [PDF]

• Pujol, J.M., Lopez-Toledo, A. and Rodriguez, P. "Fair Routing in Delay Tolerant Networks". Proceedings of the IEEE/INFOCOM 2009. [PDF]

• Siganos, G., Pujol, J.M. and Rodriguez, P. "Monitoring the Bittorrent Monitors: A bird's eye view". Proceedings of the Passive Active Measurement conference PAM 2009. [PDF]

All Publications