Henry Tirri, Ph.D.

Research Fellow, Nokia Research Center

I am also a Professor of Computer Science (University of Helsinki), and an Adjunct Professor of Computational Engineering (Helsinki University of Technology).

Contact information:

Nokia Research Center, P.O. Box 407

B-Course

Nokia Group, FIN-00045, Finland

Phone: +358 50 4860372

Research interests

My general research interests are related to intelligence in machines. As reasoning under uncertainty is one central aspect of intelligent behavior, the last 15 years I have been interested in fundamental questions related to building models from data, and performing (predictive) inference from such models (related to "data analysis"). In this broad area my main focus is on probabilistic and information-theoretic approaches, both the theoretical properties and multidisciplinary applications. Some of the results of the research (with CoSCo research group) have been implemented in B-Course data analysis service. Recently I have been particularly interested in applying these modeling methods for information retrieval including Internet search engines, collaborative behavior in e-learning environments and wireless sensor networks. In general I am interested in adaptive systems, and related notions of the above topics, such as context-awareness, community-based computing and data analysis for future networks in general.

Recent and current Conference involvement:

• SAINT 2005, AISTATS 2005, ICCBR 2005, SME'05, ICETE 2005, AWeSOMe'05, MDM'06, UAI'06, WI'05

Current Editorial Board involvement:

• International Journal of Mobile Communications,Web Intelligence and Agent Systems, International Journal of Neural Systems

What's new? (Last updated, September 17 2005)

• Keynote talk "Quest for True Ubicomp: large-scale wireless sensor networks with high-power mobile nodes" at SenSys'05
• Keynote talk "Challenges of large-scale heterogeneous wireless sensor networks" at DMSN'05
• Keynote talk "What Do People Really Do - on the power of Reality Mining for e-learning" at EDEN 2005 Annual Conference
• J. Perkiö, V. Tuulos, W. Buntine, H. Tirri, Multi-Faceted Information Retrieval System for Large Scale Email Archives. To appear in Proceedings of the IEEE/WIC/ACM Conference on Web Intelligence (WI 2005)
• P.Nokelainen, M.Miettinen, J.Kurhila, P.Floréen, H.Tirri, A Shared Document-Based Annotation Tool to Support Learner-Centered Collaborative Learning. British Journal of Educational Technology, Vol. 36, No. 5, 757-770.
• M. Miettinen, J. Kurhila, P. Nokelainen, H. Tirri, Supporting Open-Ended Discourse with Transparent Groupware. To appear in International Journal of Web Based Communities.
• M.Miettinen, P.Nokelainen, J.Kurhila, T.Silander, H.Tirri, EDUFORM - A Tool for Creating Adaptive Questionnaires. International Journal on E-Learning, Vol. 4 (2005), No. 3, 365-373.
• M. Miettinen, J. Kurhila, H. Tirri, On the Prospects of Intelligent Collaborative E-learning Systems. Pp. 483-490 in the Proceedings of the 12th International Conference on Artificial Intelligence in Education. IOS Press
• Keynote talk "Challenges of large-scale high power wireless sensor networks" at EMNETS II
• T.Roos, H.Wettig, P.Grünwald, P.Myllymäki, H.Tirri, On Discriminative Bayesian Network Classifiers and Logistic Regression. To appear in Machine Learning.
• M.Miettinen, J.Kurhila, P.Nokelainen, H.Tirri, OurWeb - Transparent Groupware for Online Communities. Pp. 53-61 in the Proceedings of the IADIS International Conference on Web-Based Communities 2005. Algarve, Portugal, February 2005.
• T.Roos, P.Myllymäki, H.Tirri, On the Behavior of MDL Denoising. In Proceedings of the 10th International Workshop on Artificial Intelligence and Statistics (AISTATS). Barbados, January 2005.
• N. Zhong, H. Tirri, Y. Yao, L. Zhou (eds.), Proceedings of the IEEE/WIC/ACM International Conference on Web Intelligence (Beijing, China, September 2004). IEEE, 2004.
• V. Tuulos, H. Tirri, Combining Topic Models and Social Networks for Chat Data Mining. Proceedings of the IEEE/WIC/ACM Conference on Web Intelligence (WI'04) (Beijing, China, September 2004), 206-213.
• W. Buntine, J. Löfström, J. Perkiö, S. Perttu, V. Poroshin, T. Silander, H. Tirri, A. Tuominen, V. Tuulos, A Scalable Topic-Based Open Source Search Engine. Proceedings of the IEEE/WIC/ACM Conference on Web Intelligence (WI'04) (Beijing, China, September 2004), 228-234.
• Keynote talk "Fundamental Challenges of Next Generation Information Retrieval" at ICETE 2004
• Keynote talk "Networked: the new science of collaborative giftedness" at ECHA 2004
• P.Kontkanen, P.Myllymäki, T.Roos, H.Tirri, K.Valtonen, H.Wettig, Topics in Probabilistic Location Estimation in Wireless Networks. Invited talk at the 15th IEEE Symposium on Personal, Indoor and Mobile Radio Communications, Barcelona, Spain. IEEE Press, 2004.
• P.Kontkanen, P.Myllymäki, T.Roos, H.Tirri, K.Valtonen, H.Wettig, Probabilistic Methods for Location Estimation in Wireless Networks. Chapter 11 in Emerging Location Aware Broadband Wireless Adhoc Networks, edited by R.Ganesh, S.Kota, K.Pahlavan and R.Agustí. Kluwer Academic Publishers, 2004.
• P.Kontkanen, P.Myllymäki, W.Buntine, J.Rissanen, H.Tirri, An MDL Framework for Data Clustering. In Advances in Minimum Description Length: Theory and Applications, edited by P. Grünwald, I.J. Myung and M. Pitt. The MIT Press, 2004.
• ALVIS project (2004-2006)

Some past life

• Visiting scholar, University of Texas at Austin and consultant, Microelectronics and Technology Corporation MCC; database transaction processing, functional languages and parallel processing (1985-86)
• Visiting scientist, AT & T Bell Laboratories; neural networks stuff in machine vision (1988)
• Visiting Associate Professor, Purdue University; research on distributed, object-oriented databases, neural networks, probabilistic modeling (1990-92)
• Project manager, ESPRIT projects VITAL and TRANSCOOP; software engineering for knowledge bases, in particular representation transformations and transactional workflows (1992-1997)
• Visiting scientist, NASA Ames Research Center; Bayesian modeling (1998)
• Professor, University of Helsinki, Director of the Intelligent Systems Lab and CoSCo research group; Bayesian and information-theoretic modeling, intelligent learning environments (1998-)
• co-founder of Ekahau Inc.; award-winning technology for positioning - Ekahau in news (2000-)
• Visiting professor, Stanford University; positioning of mobile devices, ad hoc networks (2001-2003)
• Visiting scholar, University of California, Berkeley; information retrieval and search engines (2003-2004)

Full biography (outdated ... I am working on it) >>