Georgios Chalkiadakis' Home Page

Visiting Researcher. I completed my PhD at the Department of Computer Science, University of Toronto, under the supervision of Professor Craig Boutilier ,
and from December 2006 to January 2011 I was a Research Fellow at the IAM Group here at ECS, working under the supervision of Professor Nick Jennings.

I am now an Assistant Professor at the Technical University of Crete (Dept. of Electronic and Computer Engineering).
Here is a link to my new homepage.

PhD Thesis: A Bayesian Approach to Multiagent Reinforcement Learning and Coalition Formation under Uncertainty, University of Toronto, 2007.

Interests: (sequential) decision making under uncertainty; multiagent systems; reinforcement learning in multi-agent systems; coalition formation

I have moved to the Department of Electronic and Computer Engineering, Technical University of Crete, Chania, Greece, where I am a member of the Intelligent Systems Laboratory.
Here is a link to my new homepage.

Publications

A. Journal publications

Georgios Chalkiadakis and Craig Boutilier: Sequentially Optimal Repeated Coalition Formation under Uncertainty". Journal of Autonomous Agents and Multi-Agent Systems (JAAMAS). Published online first, 5 November 2010. The final publication is available at www.springerlink.com.
Georgios Chalkiadakis, Edith Elkind, Evangelos Markakis, Maria Polukarov and Nicholas R. Jennings: "Cooperative Games with Overlapping Coalitions". Journal of Artificial Intelligence Research (JAIR), vol. 39, pages 179-216, September 2010.

B. Conference publications

Georgios Chalkiadakis, Valentin Robu, Ramachandra Kota, Alex Rogers and Nicholas R. Jennings: "Cooperatives of Distributed Energy Resources for Efficient Virtual Power Plants". In Proc. of the 10th Int. Conf. on Autonomous Agents and Multiagent Systems (AAMAS-2011), Taipei, Taiwan, May 2011 (to appear).
Georgios Chalkiadakis, Edith Elkind and Nicholas R. Jennings: "Simple Coalitional Games with Beliefs". In Proc. of the 21st International Joint Conference on Artificial Intelligence (IJCAI-09), pages 85-90, Pasadena, California, July 2009.
Georgios Chalkiadakis, Edith Elkind, Maria Polukarov and Nicholas R. Jennings: "The Price of Democracy in Coalition Formation". In Proc. of the 8th Int. Conf. on Autonomous Agents and Multiagent Systems (AAMAS-2009), pages 401-408, Budapest, Hungary, May 2009.
Georgios Chalkiadakis, Edith Elkind, Evangelos Markakis and Nicholas R. Jennings: "Overlapping Coalition Formation". In Proc. of the 4th International Workshop on Internet and Network Economics WINE-2008, pages 307-321, Shanghai, China, December 2008. You can retrieve the paper, or view the abstract .
- A preliminary version of this paper also appeared in CTN-2008 (the 13th Coalition Theory Network workshop - no published proceedings).
- An extended abstract/discussion on this work also appeared in ACM SIGecom Exchanges, volume 8, issue 1 (July 2009), under the title "Stability of Overlapping Coalitions" (with E. Elkind, E. Markakis, M. Polukarov and N. R. Jennings).
Edith Elkind, Georgios Chalkiadakis and Nicholas R. Jennings: "Coalition Structures in Weighted Voting Games". In Proc. of the 18th European Conference on Artificial Intelligence (ECAI-2008), pages 393-397, Patras, Greece, July 2008. Best Paper Award Finalist.
- A version of this paper also appeared in COMSOC-2008 (the 2nd International Workshop on Computational Social Choice - no published proceedings).
Georgios Chalkiadakis and Craig Boutilier: "Sequential Decision Making in Repeated Coalition Formation under Uncertainty". In Proc. of the 7th Int. Conf. on Autonomous Agents and Multiagent Systems (AAMAS-2008), pages 347-354, Estoril, Portugal, May 2008.
W.T. Luke Teacy, Georgios Chalkiadakis, Alex Rogers and Nicholas R. Jennings: "Sequential Decision Making with Untrustworthy Service Providers". In Proc. of the 7th Int. Conf. on Autonomous Agents and Multiagent Systems (AAMAS-2008), pages 755-762, Estoril, Portugal, May 2008.
Georgios Chalkiadakis, Evangelos Markakis and Craig Boutilier: "Coalition Formation under Uncertainty: Bargaining Equilibria and the Bayesian Core Stability Concept". In Proc. of the 6th Int. Conf. on Autonomous Agents and Multiagent Systems (AAMAS-2007), pages 400-407, Honolulu, USA, May 2007. You can retrieve the paper here.
Georgios Chalkiadakis and Craig Boutilier: "Coalitional Bargaining with Agent Type Uncertainty". IJCAI-07. You can retrieve the paper here.
Georgios Chalkiadakis and Craig Boutilier: "Bayesian Reinforcement Learning for Coalition Formation Under Uncertainty". AAMAS 2004 Honorable Mention, Best Student Paper Award Finalist.You can view the abstract or you can retrieve the paper.
Georgios Chalkiadakis and Craig Boutilier: "Coordination in Multiagent Reinforcement Learning: A Bayesian Approach". AAMAS 2003 You can view the abstract or you can retrieve the paper. [Note: It is mistakenly mentioned/implied in the originally published paper (the version in this site is a corrected version) that the agents observe the rewards of others. This was not the case, nor was this observability assumption anywhere used or needed in our analysis. ]

Theses and Technical Reports

Georgios Chalkiadakis: "A Bayesian Approach to Multiagent Reinforcement Learning and Coalition Formation under Uncertainty". PhD Thesis, Department of Computer Science, University of Toronto, 2007.
Georgios Ch. Chalkiadakis: "An Agent-Based Architecture for the Conduction of Voting" , Master of Science Thesis, Computer Science Department, University of Crete, 1999 (The document is in greek.)
Georgios Chalkiadakis: "Multiagent Reinforcement Learning: Stochastic Games With Multiple Learning Players", PhD Qualifying Depth Oral Report, Department of Computer Science, University of Toronto, 2003.
D. Katehakis, G. Chalkiadakis, M. Tsiknakis, S. Orphanoudakis: "A Distributed, Agent-Based Architecture for the Acquisition, Management, Archiving and Display of Real-Time Monitoring Data in the Intensive Care Unit" (pdf) and (ps.gz) , FORTH-ICS/TR-261, October 1999.

Events

I am a member of the organizing committee of the AAMAS-2010 Workshop on Multi-agent Sequential Decision-Making in Uncertain Domains (MSDM-2010) Check out the call for papers and the submission procedure!
Tutorial: "Cooperative Games in Multi-Agent Systems" (with Michael Wooldridge and Edith Elkind). Instantiations of this tutorial have been/will be presented during AAMAS-2009, AAMAS-2010, and AAAI-2010.

I am the organizer of the Sequential Decision Making Reading Group here at ECS.

E-mail: gehalkatecedottucdotgr

Mailing Address:

School of Electronics and Computer Science
Building 32, Level 4 (IAM Group),
University of Southampton
Southampton
SO17 1BJ
United Kingdom

Tel. / Fax:
+44 (0) 23 8059 3270 / +44 (0) 23 8059 2865