Panayiotis Tsaparas

PhD Researcher
HIIT, Basic Research Unit

Address:
Department of Computer Science
P.O. Box 68 (Gustaf Hällströmin katu 2b)
FIN-00014, University of Helsinki
Finland.

Phone: +358 9 191 51257
Fax: +358 9 191 51120
e-mail: lastname@cs.helsinki.fi

Welcome...Tervetuloa...Καλώς ήρθατε...

I received my B.Sc. degree from University of Crete, Heraklion, Greece, in September 1995.
I received my Ph.D. degree from University of Toronto, in September 2003, working under the supervision of Allan Borodin.
I was a Post-doctoral Fellow in University of Helsinki, working with Heikki Mannila, from February 2004, to September 2006.

Since September 2006 I have moved to Microsoft, Search Labs, working as an Applied Scientist Researcher.


Click here for a look at my CV.

Research Interests

• Models and algorithms for the Web

• Data mining, clustering, clustering and rank aggregation.

• Social Networks

Teaching

Winter 2006: Models and Algorithms for Complex Networks

Spring 2005: Information Networks

Spring 2005: Study group on spectral methods

Publications

Submitted for publication

• A. Gionis, H. Mannila, P. Tsaparas, Clustering Aggregation. Sumbitted to ACM Transactions on Knowledge Discovery from Data (TKDD).
• P. Tsaparas, Using Non-Linear Dynamical Systems for Web Searching and Ranking (journal version). Submitted for publication
• P. Tsaparas, Stability in Generalized Adversarial Queueing Theory, Submitted for publication.

Journal Papers

• P. Tsaparas, L. Marino-Ramirez, O. Bodenreider, E. V. Koonin, and I. K. Jordan Global similarity and local divergence in human and mouse gene co-expression networks , BMC Evolutionary Biology 2006, 6:70 .

• A. Borodin, J. S. Rosenthal, G. O. Roberts, P. Tsaparas, Link Analysis Ranking: Algorithms, Theory and Experimets , ACM Transactions on Internet Technologies (TOIT), Vol 5, No 1, February 2005.

Papers in refereed conferences

• T. Mielikäinen, E. Terzi, P. Tsaparas, Aggregating Time Partitions, KDD, Philadelphia, 2006.
• A. Gionis, H. Mannila, T. Mielikäinen, P. Tsaparas, Assessing data mining results via swap randomization, KDD, Philadelphia, 2006. (Best paper award runner-up)
• E. Terzi, P. Tsaparas, Efficient algorithms for sequence segmentation, SIAM Conference on Data Mining (SDM), 2006.
  
• S. Papadimitriou, A. Gionis, P. Tsaparas, A. Väisänen, H. Mannila, C. Faloutsos, Parameter-Free Spatial Data Mining Using MDL, 5th International Conference on Data Mining (ICDM) 2005
• F. Afrati, G. Das, A. Gionis, H. Mannila, T. Mielikäinen, P. Tsaparas, Mining chains of relations, 5th International Conference on Data Mining (ICDM) 2005
• A. Gionis, A. Hinnenburg, S. Papadimitriou, P. Tsaparas. Dimension Induced Clustering. KDD, Chicago, 2005
• D. Donato, S. Millozzi, S. Leonardi, P. Tsaparas. Mining the Inner Structure of the Web Graph. WebDB workshop, Baltimore, 2005
• D. Donato, S. Leonardi, P. Tsaparas. Stability and Similarity of Link Analysis Ranking Algorithms.  ICALP, Lisbon, Portugal, 2005.
• A. Gionis, H. Mannila, P.Tsaparas, Clustering Aggregation, ICDE, Japan, Tokyo, 2005
• P. Tsaparas, Using Non-Linear Dynamical Systems for Web Searching and Ranking , Principles of Database Systems (PODS), Paris, 2004
• P. Andritsos, R. J. Miller, P. Tsaparas, Information-Theoretic Tools for Mining Database Structure from Large Data Sets , SIGMOD, Paris, 2004
• P. Andritsos, P. Tsaparas, R. J. Miller, K. C. Sevcik. LIMBO: Scalable Clustering of Categorical Data , 9th International Conference on Extending DataBase Technology (EDBT), Heraklion, Greece, 2004.
• P. Tsaparas, T. Palpanas, Y. Kotidis, N. Koudas, D. Srivastava. Ranked Join Indices, ICDE, Bangalore, India, March 2003.
• P. Raghavan, P. Tsaparas, Mining Significant Associations in Large Scale Text Corpora, International Conference on Data Mining (ICDM), Maebashi Japan, December 2002.
• A. Borodin, J. S. Rosenthal, G. O. Roberts, P. Tsaparas, Finding Authorities and Hubs From Link Structures on the World Wide Web (extended version), 10th World Wide Web Conference, Hong Kong, 2001.

Technical Reports

• G. Giakkoupis, A. Gionis, E. Terzi, P. Tsaparas, Models and algorithms for network immunization. Technical Report C-2005-75, Department of Computer Science, University of Helsinki, 2005.
• P. Tsaparas, Nearest Neighbor Search in Multidimensional Spaces, Technical Report 319-02, Department of Computer Science, University of Toronto, 1999.

Theses

• P. Tsaparas, Link Analysis Ranking , Ph.D. Thesis, Department of Computer Science, University of Toronto, 2004.
• P. Tsaparas, Stability in Adversarial Queueing Theory, M.Sc Thesis, Department of Computer Science, University of Toronto, 1997.
• P. Tsaparas, Modeling of Inter-Media Synchronization Algorithms in Multimedia Applications , B.Sc. Thesis, University of Crete, 1995.