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[About Kjetil Nørvåg] [Travel photos] [Research Interests] [Publications] [CV]


CURRICULUM VITAE

Name: Kjetil Nørvåg
Phone: +47 73 59 67 55
Fax: +47 73 59 44 66
Citizenship: Norwegian
Email: Kjetil dot Norvag at idi.ntnu.no
URL: http://www.idi.ntnu.no/~noervaag/

CURRENT OCCUPATION

Professor in the Department of Computer and Information Science, Norwegian University of Science and Technology (NTNU).

EDUCATION

PROFESSIONAL EXPERIENCE

RESEARCH INTERESTS

Big Data, distributed and parallel database systems, query processing, temporal information retrieval and text mining.

EXTERNAL GRANTS

As a Principal Investigator:

As a project member: As participant: PUBLICATIONS

Journal Papers

  1. Orestis Gkorgkas, Akrivi Vlachou, Christos Doulkeridis, and Kjetil Nørvåg, Exploratory product search using top-k join queries, Information Systems, Vol. 64, March, pages 75-92, 2017.

  2. Christos Doulkeridis and Kjetil Nørvåg, A Survey of Large-Scale Analytical Query Processing in MapReduce, VLDB Journal, Vol. 23, No. 3, pages 355-380, June 2014.

  3. Kostas Stefanidis, Eirini Ntoutsi, Mihalis Petropoulos, Kjetil Nørvåg, and Hans-Peter Kriegel, A Framework for Modeling, Computing and Presenting Time-aware Recommendations, Transactions on Large-Scale Data- and Knowledge-Centered Systems, Vol. 10, pages 146-172, 2013.

  4. Akrivi Vlachou, Christos Doulkeridis, and Kjetil Nørvåg, Distributed Top-k Query Processing by Exploiting Skyline Summaries, Distributed and Parallel Databases, Vol. 30, No. 3, August 2012.

  5. Akrivi Vlachou, Christos Doulkeridis, Yannis Kotidis, and Kjetil Nørvåg, Monochromatic and Bichromatic Reverse Top-k Queries, IEEE Transactions on Knowledge and Data Engineering, Vol. 23, No. 8, August 2011.

  6. Robert Neumayer, Christos Doulkeridis, and Kjetil Nørvåg, Hybrid Approach for Estimating Document Frequencies in Unstructured P2P Networks, Information Systems, Vol. 36, No. 3, May 2011.

  7. Jon Olav Hauglid, Norvald H. Ryeng, and Kjetil Nørvåg, DYFRAM: Dynamic Fragmentation and Replica Management in Distributed Database Systems, Distributed and Parallel Databases, Vol. 23, No. 2-3, December 2010.

  8. Christos Doulkeridis, Akrivi Vlachou, Kjetil Nørvåg, Yannis Kotidis, and Michalis Vazirgiannis, Efficient Search based on Content Similarity over Self-Organizing P2P Networks, Journal on Peer-to-Peer Networking and Applications, Vol 3, No. 1, pages 67-79, March 2010.

  9. Kjetil Nørvåg, Eirik Eide, and Odin Standal, Query Planning in the PORDaS P2P Database System, JDIM, Vol 6, No. 4, pages 307-314, August 2008.

  10. Christos Doulkeridis, Vassilis Zafeiris, Kjetil Nørvåg, Michalis Vazirgiannis, and Emmanouel Giakoumakis, Context-based Caching and Routing for P2P Web Service Discovery, Distributed and Parallel Databases, Vol 21, No. 1 pages 59-84, Springer Science, February 2007.

  11. Christos Doulkeridis, Kjetil Nørvåg, and Michalis Vazirgiannis, DESENT: Decentralized and distributed semantic overlay generation in P2P networks, IEEE Journal on Selected Areas in Communications, Vol. 25, No. 1, pages 25-34, IEEE January 2007.

  12. Kjetil Nørvåg, Granularity Reduction in Temporal Document Databases. Information Systems, Vol 31, No. 2, pages 134-147, Elsevier Science, April 2006.

  13. Kjetil Nørvåg, The Design, Implementation, and Performance of the V2 Temporal Document Database System, Journal of Information and Software Technology, Vol. 46, No. 9, pages 557-574, Elsevier Science, July 2004.

  14. Kjetil Nørvåg, The Vagabond Approach to Logging and Recovery in Transaction-Time Temporal Object Database Systems, IEEE Transactions on Knowledge and Data Engineering, Vol. 16, No. 4, pages 504-518, IEEE, April 2004.

  15. Kjetil Nørvåg, Buffer Performance Modeling In the Context of Unclustered Index Accesses with Non-Uniform Access Pattern, Information Sciences, Vol. 167, No. 1-4, pages 239-262, Elsevier Science, December 2004.

  16. Kjetil Nørvåg, Supporting Temporal Text-Containment Queries in Temporal Document Databases, Data and Knowledge Engineering Journal, Vol. 49, No. 1, pages 105-125, Elsevier Science, April 2004.

  17. Kjetil Nørvåg, A Study of Object Declustering Strategies in Parallel Temporal Object Database Systems, Information Sciences, Vol. 146, No. 1-4, pages 1-27, Elsevier Science, October 2002.

  18. Kjetil Nørvåg, Signature Caching in Parallel Object Database Systems, Journal of Information and Software Technology, Vol. 44, No. 6, pages 331-341, Elsevier Science, April 2002.

  19. Kjetil Nørvåg, Fine-Granularity Signature Caching in Object Database Systems, Data and Knowledge Engineering Journal, Vol. 38, No. 2, pages 101-119, Elsevier Science, August 2001.

  20. Kjetil Nørvåg, Issues in Transaction-Time Temporal Object Database Systems, Journal of Database Management, Vol. 12, No. 4, pages 40-51, Oct-Dec 2001.

Books

  1. Nattiya Kanhabua, Roi Blanco, and Kjetil Nørvåg, Temporal Information Retrieval, Foundations and Trends in Information Retrieval, Now Publishers, 2015.

  2. Chee Yong Chan, Jiaheng Lu, Kjetil Nørvåg, Egemen Tanin (Eds.), Workshops Proceedings of the 29th IEEE International Conference on Data Engineering, ICDE 2013, Brisbane, Australia, April 8-12, 2013. IEEE Computer Society, 2013.

  3. Akrivi Vlachou, Christos Doulkeridis, Kjetil Nørvåg, and Yannis Kotidis, Peer-to-Peer Query Processing over Multidimensional Data, Springer, 2012.

Book Chapters

  1. Jon Olav Hauglid, Norvald H. Ryeng, and Kjetil Nørvåg, The DASCOSA-DB Grid Database System, Grid and Cloud Database Management (Springer), August 2011.

  2. Christos Doulkeridis, Akrivi Vlachou, Kjetil Nørvåg, and Michalis Vazirgiannis, Distributed semantic overlay networks, Handbook of Peer-to-Peer Networking, Springer, January 2010.

  3. Kjetil Nørvåg, Query Operators in Temporal XML Databases, in L. C. Rivero, J. H. Doorn, V. E. Ferraggine (Eds.), Encyclopedia of Database Technologies and Applications, 2005.

  4. Kjetil Nørvåg and Kjell Bratbergsengen, Optimal Object Descriptor Caching in Temporal Object Database Systems, In K. Tanaka , S. Ghandeharizadeh, and Y. Kambayashi (Eds.), Information Organization and Databases, pages 235-248, Kluwer Academic Publishers, November 2000.

International Conferences

  1. Jan R. Benetka, Krisztian Balog and Kjetil Nørvåg, Towards Building a Knowledge Base of Monetary Transactions from a News Collection, Proceedings of JCDL'2017, Toronto, Canada, June 2017.

  2. Jan R. Benetka, Krisztian Balog and Kjetil Nørvåg, Anticipating Information Needs Based on Check-in Activity, Proceedings of WSDM'2017, Cambridge, UK, February 2017.

  3. Mei Saouk, Christos Doulkeridis, Akrivi Vlachou, and Kjetil Nørvåg, Efficient Processing of Top-k Joins in MapReduce, Proceedings of IEEE BigData 2016, Washington D.C.,USA, December 2016.

  4. Tomasz Kusmierczyk and Kjetil Nørvåg, Online Food Recipe Title Semantics: Combining Nutrient Facts and Topics, Proceeedings of CIKM'2016, Indianapolis, USA, October 2016.

  5. Tomasz Kusmierczyk, Christoph Trattner, and Kjetil Nørvåg, Understanding and Predicting Online Food Recipe Production Patterns, Proceeedings of Hypertext'2016, Halifax, Canada, July 2016.

  6. Sean Chester, Orestis Gkorgkas, and Kjetil Nørvåg, Top-k Dominating Queries, in Parallel, in Memory, Proceedings of EDBT'2016, Bordeaux, France, March 2016.

  7. Santiago Larrain, Christoph Trattner, Denis Parra, Eduardo Graells-Garrido, and Kjetil Nørvåg, Good Times Bad Times: A Study on Recency Effects in Collaborative Filtering for Social Tagging, Proceedings of the 9th ACM Conference on Recommender Systems (RecSys 2015), Vienna, Austria, September 2015.

  8. Orestis Gkorgkas, Akrivi Vlachou, Christos Doulkeridis, and Kjetil Nørvåg, Maximizing Influence of Spatio-Textual Objects Based on Keyword Selection, Proceedings of SSTD'2015, Seoul, South Korea, August 2015.

  9. Tomasz Kusmierczyk, Christoph Trattner, and Kjetil Nørvåg, Temporality in Online Food Recipe Consumption and Production (poster), Proceedings of WWW'2015, Firenze, Italy, May 2015.

  10. Tomasz Kusmierczyk, Christoph Trattner, and Kjetil Nørvåg, Temporal Patterns in Online Food Innovation, Proceedings of TempWeb'2015 (WWW Companion Volume), Firenze, Italy, May 2015.

  11. Tomasz Kusmierczyk and Kjetil Nørvåg, Mining Correlations on Massive Bursty Time Series Collections, Proceedings of DASFAA'2015, Hanoi, Vietnam, April 2015.

  12. Jan Rybak, Krisztian Balog, and Kjetil Nørvåg, IR Game: How well do you know information retrieval papers?, Proceedings of GamifIR'15 (co-located with ECIR'2015), Vienna, Austria, March 2015.

  13. Orestis Gkorgkas, Akrivi Vlachou, Christos Doulkeridis, and Kjetil Nørvåg, Finding the Most Diverse Products using Preference Queries, Proceedings of EDBT'2015, Brussels, Belgium, March 2015.

  14. Dimitrios Kotsakos, Theodoros Lappas, Dimitrios Kotzias, Dimitrios Gunopulos, Nattiya Kanhabua, and Kjetil Nørvåg, A Burstiness-aware Approach for Document Dating, Proceedings of SIGIR'2014, Gold Coast, Australia, July 2014.

  15. Jan Rybak, Krisztian Balog, and Kjetil Nørvåg, ExperTime: Tracking Expertise over Time (demo), Proceedings of SIGIR'2014, Gold Coast, Australia, July 2014.

  16. Orestis Gkorgkas, Akrivi Vlachou, Christos Doulkeridis, and Kjetil Nørvåg, Efficient Processing of Exploratory Top-k Joins, Proceedings of SSDBM'2014, Aalborg, Denmark, July 2014.

  17. Stian Liknes, Akrivi Vlachou, Christos Doulkeridis, and Kjetil Nørvåg, APSkyline: Improved Skyline Computation for Multicore Architectures, Proceedings of DASFAA'2014, Bali, Indonesia, April 2014.

  18. Jan Rybak, Krisztian Balog, and Kjetil Nørvåg, Temporal Expertise Profiling, Proceedings of ECIR'2014, Amsterdam, The Netherlands, April 2014.

  19. Orestis Gkorgkas, Kostas Stefanidis, and Kjetil Nørvåg, A Framework for Grouping and Summarizing Keyword Search Results, Proceedings of ADBIS'2013, Genova, Italy, September 2013.

  20. Marek Ciglan, Michal Laclavik, and Kjetil Nørvåg, On Community Detection in Real-World Networks and the Importance of Degree Assortativity, Proceedings of KDD'2013, Chicago, USA, August 2013.

  21. Orestis Gkorgkas, Akrivi Vlachou, Christos Doulkeridis, and Kjetil Nørvåg, Discovering Influential Data Objects over Time, Proceedings of SSTD'2013, Munich, Germany, August 2013.

  22. Akrivi Vlachou, Christos Doulkeridis, Kjetil Nørvåg, and Yannis Kotidis, Branch-and-Bound Algorithm for Reverse Top-k Queries, Proceedings of SIGMOD'2013, New York, USA, June 2013.

  23. Krisztian Balog, Naimdjon Takhirov, Heri Ramampiaro, and Kjetil Nørvåg, Multi-step Classification Approaches to Cumulative Citation Recommendation, Proceedings of Open research Areas in Information Retrieval (OAIR'2013), Lisbon, Portugal, May 2013.

  24. Krisztian Balog, Heri Ramampiaro, and Kjetil Nørvåg, KBAAA: A Web-based Toolkit for the Assessment and Analysis of Knowledge Base Acceleration Systems (demo paper), Proceedings of Open research Areas in Information Retrieval (OAIR'2013), Lisbon, Portugal, May 2013.

  25. George Tsatsaronis, Iraklis Varlamis, Nattiya Kanhabua, and Kjetil Nørvåg, Temporal Classifiers for Predicting the Expansion of Medical Subject Headings, Proceedings of CICLing'2013, Samos, Greece, March 2013.

  26. Eivind Bjørkelund, Thomas H. Burnett, and Kjetil Nørvåg, A Study of Opinion Mining and Visualization of Hotel Reviews, Proceedings of iiWAS'2012, Bali, Indonesia, December 2012.

  27. George Tsatsaronis, Iraklis Varlamis, and Kjetil Nørvåg, SemaFor: Semantic Document Indexing using Semantic Forests, Proceedings of CIKM'2012, Maui, Hawaii, USA, October 2012.

  28. Nattiya Kanhabua and Kjetil Nørvåg, Learning to Rank Search Results for Time-Sensitive Queries (poster), Proceedings of CIKM'2012, Maui, Hawaii, USA, October 2012.

  29. Nattiya Kanhabua and Kjetil Nørvåg, Estimating Query Difficulty for News Prediction Retrieval (poster), Proceedings of CIKM'2012, Maui, Hawaii, USA, October 2012.

  30. Krisztian Balog and Kjetil Nørvåg, On the Use of Semantic Knowledge Bases for Temporally-aware Entity Retrieval, Proceedings of ESAIR'2012 (co-located with CIKM'2012), Maui, Hawaii, USA, October 2012.

  31. Krisztian Balog, Robert Neumayer, and Kjetil Nørvåg, Collection Ranking and Selection for Federated Entity Search, Proceedings of SPIRE'2012, Cartagena, Colombia, October 2012.

  32. Irini Ntoutsi, Kostas Stefanidis, Kjetil Nørvåg, and Hans-Peter Kriegel, Fast Group Recommendations by Applying User Clustering, Proceedings of ER'2012, Firenze, Italy, October 2012.

  33. Kostas Stefanidis, Nafiseh Shabib, Kjetil Nørvåg, and John Krogstie, Contextual Recommendations for Groups, Proceedings of NoCoDA 2012 (co-located with ER'2012), Firenze, Italy, October 2012.

  34. Kostas Stefanidis, Irini Ntoutsi, Kjetil Nørvåg, and Hans-Peter Kriegel, A Framework for Time-aware Recommendations, Proceedings of DEXA'2012, Vienna, Austria, September 2012.

  35. Robert Neumayer, Krisztian Balog and Kjetil, Nørvåg, Ranking Distributed Knowledge Repositories, Proceedings of TPDL'2012, Paphos, Cyprus, September 2012.

  36. Christos Doulkeridis and Kjetil Nørvåg, On Saying "Enough Already!" in MapReduce, Proceedings of 1st International Workshop on Cloud Intelligence (Cloud-I 2012, co-located with VLDB'2012), Istanbul, Turkey, August 2012.

  37. Nattiya Kanhabua, Klaus Berberich, and Kjetil Nørvåg, Learning to Select a Time-aware Ranking Model (poster), Proceedings of SIGIR'2012, Portland, Oregon, USA, August 2012.

  38. Marek Ciglan, Kjetil Nørvåg and Ladislav Hluchy, The SemSets Model for Ad-hoc Semantic List Search, Proceedings of WWW'2012, Lyon, France, April 2012.

  39. Christos Doulkeridis, Akrivi Vlachou, Kjetil Nørvåg, Yannis Kotidis, and Neoklis Polyzotis, Processing of Rank Joins in Highly Distributed Systems, Proceedings of ICDE'2012, Washington, DC USA, April 2012.

  40. Robert Neumayer, Krisztian Balog, and Kjetil Nørvåg, On the Modeling of Entities for Ad-hoc Entity Search in the Web of Data, Proceedings of ECIR'2012, Barcelona, Spain, April 2012.

  41. Robert Neumayer, Krisztian Balog, and Kjetil Nørvåg, When Simple is (more than) Good Enough: Effective Semantic Search with (almost) no Semantics (poster), Proceedings of ECIR'2012, Barcelona, Spain, April 2012.

  42. Irene Ntoutsi, Kostas Stefanidis, Kjetil Nørvåg, and Hans-Peter Kriegel, gRecs: A Group Recommendation System based on User Clustering (demo paper), Proceedings of DASFAA'2012, Busan, South Korea, April 2012.

  43. João Batista da Rocha Junior and Kjetil Nørvåg, Top-k Spatial Keyword Queries on Road Networks, Proceedings of EDBT'2012, Berlin, Germany, March 2012.

  44. George Tsatsaronis, Matthias Reimann, Iraklis Varlamis, Orestis Gkorgkas, Kjetil Nørvåg, Efficient Community Detection Using Power Graph Analysis, Proceedings of the 9th International Workshop on Large-Scale and Distributed Systems for Information Retrieval (LSDS-IR'11, in conjunction with CIKM'2011), Glasgow, Scotland, UK, October 2011.

  45. João Batista da Rocha Junior, Akrivi Vlachou, Christos Doulkeridis, and Kjetil Nørvåg, Efficient Processing of Top-k Spatial Preference Queries, Proceedings of the VLDB Endowment (PVLDB), Vol. 4, No. 2, September 2011.

  46. George Tsatsaronis, Iraklis Varlamis, Sunna Torge, Matthias Reimann, Kjetil Nørvåg, Michael Schroeder, and Matthias Zschunke, How to Become a Group Leader? or Modelling Author Types based on Graph Mining, Proceedings of TPDL'2011, Berlin, Germany, September 2011.

  47. Robert Neumayer, George Tsatsaronis, and Kjetil Nørvåg, TRUMIT: A Tool to Support Large-Scale Mining of Text Association Rules (demo paper), Proceedings of ECML PKDD'2011, Athens, Greece, September 2011.

  48. João Batista da Rocha Junior, Orestis Gkorgkas, Simon Jonassen, and Kjetil Nørvåg, Efficient Processing of Top-k Spatial Keyword Queries, Proceedings of SSTD'2011, Minneapolis, USA, August 2011.

  49. Nattiya Kanhabua and Kjetil Nørvåg, A Comparison of Temporal Ranking Methods (poster), Proceedings of SIGIR'2011, Beijing, China, July 2011.

  50. Nattiya Kanhabua and Kjetil Nørvåg, Time-based Query Performance Predictors (poster), Proceedings of SIGIR'2011, Beijing, China, July 2011.

  51. Akrivi Vlachou, Christos Doulkeridis, and Kjetil Nørvåg, Monitoring Reverse Top-k Queries Over Mobile Devices, Proceedings of MobiDE'2011, Athens, Greece, June 2011.

  52. Robert Neumayer and Kjetil Nørvåg, Evaluation of Feature Combination Approaches for Text Categorisation, Proceedings of ISMIS'2011, Warsaw, Poland, June 2011.

  53. Norvald H. Ryeng, Akrivi Vlachou, Christos Doulkeridis, and Kjetil Nørvåg, Efficient Distributed Top-k Query Processing with Caching, Proceedings of DASFAA'2011, Hong Kong,China, April 2011.

  54. Robert Neumayer, Rudolf Mayer, and Kjetil Nørvåg, Combination of Feature Selection Methods for Text Categorisation, Proceedings of ECIR'2011, Dublin, Ireland, April 2011.

  55. Krisztian Balog, Marek Ciglan, Robert Neumayer, Wei Wei, and Kjetil Nørvåg, NTNU at SemSearch 2011, 4th International Semantic Search Workshop (SEMSEARCH'11), WWW 2011 conference, April 2011.

  56. João Batista da Rocha Junior, Akrivi Vlachou, Christos Doulkeridis, and Kjetil Nørvåg, Efficient Execution Plans for Distributed Skyline Query Processing, Proceedings of EDBT'2011, Uppsala, Sweden, March 2011.

  57. Norvald H. Ryeng, Jon Olav Hauglid, and Kjetil Nørvåg, Site-Autonomous Distributed Semantic Caching, Proceedings of ACM SAC'2011, Taichung, Taiwan, March 2011.

  58. Xiangliang Zhang, Wei Wang, Kjetil Nørvåg, and Michele Sebag, K-AP: Generating Specified K Clusters by Efficient Affinity Propagation, Proceedings of IEEE International Conference on Data Mining (ICDM'2010), Sydney, Australia, December 2010.

  59. Marek Ciglan and Kjetil Nørvåg, Fast detection of size-constrained communities in large networks, Proceedings of WISE'2010, Hong Kong, China, December 2010.

  60. Christos Doulkeridis, Akrivi Vlachou, Kjetil Nørvåg, Yannis Kotidis, and Michalis Vazirgiannis, On the Selectivity of Multidimensional Routing Indices, Proceedings of CIKM'2010, Toronto, Canada, October 2010.

  61. Marek Ciglan and Kjetil Nørvåg, WikiPop - Personalized Event Detection System Based on Wikipedia Page View Statistics (demo paper), Proceedings of CIKM'2010, Toronto, Canada, October 2010.

  62. Akrivi Vlachou, Christos Doulkeridis, Kjetil Nørvåg, and Yannis Kotidis, Identifying the Most Influential Data Objects with Reverse Top-k Queries, Proceedings of VLDB'2010, Singapore, September 2010.

  63. Nattiya Kanhabua and Kjetil Nørvåg, Determining Time of Queries for Re-ranking Search Results, Proceedings of ECDL'2010, Glasgow, Scotland, UK, September 2010.

  64. Nattiya Kanhabua and Kjetil Nørvåg, QUEST: Query Expansion using Synonyms over Time (demo paper), Proceedings of ECML PKDD'2010, Barcelona, Spain September 2010.

  65. George Tsatsaronis, Iraklis Varlamis, and Kjetil Nørvåg, SemanticRank: Ranking Keywords and Sentences Using Semantic Graphs, Proceedings of COLING'2010, Beijing, China, August 2010.

  66. Nattiya Kanhabua and Kjetil Nørvåg, Exploiting Time-based Synonyms in Searching Document Archives, Proceedings of JCDL'2010, Brisbane, Australia, June 2010.

  67. Christian Bøhn and Kjetil Nørvåg, Extracting Named Entities and Synonyms from Wikipedia, Proceedings of the 24th IEEE International Conference on Advanced Information Networking and Applications (AINA'2010), Perth, Australia, May 2010.

  68. Marek Ciglan, Etienne Rivière, and Kjetil Nørvåg, Learning to find interesting connections in Wikipedia, Proceedings of the 12th International Asia-Pacific Web Conference (APWeb'2010), Busan, Korea, April 2010.

  69. Marek Ciglan and Kjetil Nørvåg, SGDB - Simple graph database optimized for activation spreading computation, Proceedings of GDM'2010 (in conjunction with DASFAA'2010), Tsukuba, Japan, April 2010.

  70. Akrivi Vlachou, Christos Doulkeridis, Yannis Kotidis, and Kjetil Nørvåg, Reverse Top-k Queries, Proceedings of ICDE'2010, Los Angeles, USA, March 2010.

  71. George Tsatsaronis, Iraklis Varlamis, and Kjetil Nørvåg, An Experimental Study on Unsupervised Graph-based Word Sense Disambiguation, Proceedings of CICLing'2010, Iasi, Romania, March 2010.

  72. Christos Doulkeridis, Akrivi Vlachou, Kjetil Nørvåg, Yannis Kotidis, and Michalis Vazirgiannis, Multidimensional Routing Indices for Efficient Distributed Query Processing, Proceedings of CIKM'2009, Hong Kong, China, November 2009.

  73. George Tsatsaronis, Iraklis Varlamis, Sofia Stamou, Kjetil Nørvåg, and Michalis Vazirgiannis, Semantic Relatedness Hits Bibliographic Data, Proceedings of 11th ACM International Workshop on Web Information and Data Management (WIDM), Hong Kong, China, November 2009.

  74. Robert Neumayer, Christos Doulkeridis, and Kjetil Nørvåg, Aggregation of Document Frequencies in Unstructured P2P Networks, Proceedings of WISE'2009, Poznan, Poland, October 2009.

  75. João Batista da Rocha Junior, Akrivi Vlachou, Christos Doulkeridis, and Kjetil Nørvåg, AGiDS: A Grid-based Strategy for Distributed Skyline Query Processing, Proceedings of Globe'2009, Linz, Austria, September 2009.

  76. Nattiya Kanhabua and Kjetil Nørvåg, Using Temporal Language Models for Document Dating (demo paper), Proceedings of ECML PKDD'2009, Bled, Slovenia, September 2009.

  77. George Tsatsaronis, Iraklis Varlamis, Michalis Vazirgiannis, and Kjetil Nørvåg, Omiotis: A Thesaurus-based Measure of Text Relatedness (demo paper), Proceedings of ECML PKDD'2009, Bled, Slovenia, September 2009.

  78. Akrivi Vlachou and Kjetil Nørvåg, Bandwidth-constrained Distributed Skyline Computation, Proceedings of the 8th International ACM Workshop on Data Engineering for Wireless and Mobile Access (ACM MobiDE'2009, in conjunction with SIGMOD'2009), Providence, USA, June 2009.

  79. Jon Olav Hauglid, Kjetil Nørvåg, and Norvald H. Ryeng, Efficient and Robust Database Support for Data-Intensive Applications in Dynamic Environments, Proceedings of ICDE'2009, Shanghai, China April 2009.

  80. Kjetil Nørvåg and Ole Kristian Fivelstad, Semantic-Based Temporal Text-Rule Mining, Proceedings of the 10th International Conference on Intelligent Text Processing and Computational Linguistics (CICLing 2009), Mexico City, Mexico, March 2009.

  81. Jon Olav Hauglid and Kjetil Nørvåg, PROQID: Partial restarts of queries in distributed databases, Proceedings of CIKM'2008, Napa Valley, USA, November 2008.

  82. Norvald H. Ryeng and Kjetil Nørvåg, RIPPNET: Efficient Range Indexing in Peer-to-Peer Networks, Proceedings of ICDIM'2008, London, U.K., November 2008.

  83. Christos Doulkeridis, Kjetil Nørvåg, and Michalis Vazirgiannis, Peer-to-Peer Similarity Search over Widely Distributed Document Collections, Proceedings of the 6th Workshop on Large-Scale Distributed Systems for Information Retrieval (LSDS-IR'08, in conjunction with CIKM'2008), Napa Valley, USA, October 2008.

  84. Nattiya Kanhabua and Kjetil Nørvåg, Improving Temporal Language Models For Determining Time of Non-Timestamped Documents, Proceedings of the 12th European Conference on Research and Advanced Technology for Digital Libraries 2008 (ECDL'2008), Aarhus, Denmark, September 2008.

  85. Norvald H. Ryeng and Kjetil Nørvåg, Robust Aggregation in Peer-to-Peer Database Systems, Proceedings of IDEAS'2008, Coimbra, Portugal, September 2008.

  86. Akrivi Vlachou, Christos Doulkeridis, Kjetil Nørvåg, and Michalis Vazirgiannis, On Efficient Top-k Query Processing in Highly Distributed Environments, Proceedings of ACM SIGMOD'2008, Vancouver, Canada, June 2008.

  87. Christos Doulkeridis, Kjetil Nørvåg, and Michalis Vazirgiannis, Schema-Assisted Peer Selection for XML Querying in Unstructured P2P Systems, Proceedings of the Seventh International ACM Workshop on Data Engineering for Wireless and Mobile Access (MobiDE'2008, in conjunction with SIGMOD'2008), Vancouver, Canada, June 2008.

  88. Akrivi Vlachou, Christos Doulkeridis, Kjetil Nørvåg, and Michalis Vazirgiannis, Skyline-based Peer-to-Peer Top-k Query Processing, Proceedings of 24th IEEE International Conference on Data Engineering (ICDE'08), Cancun, Mexico, April 2008.

  89. Kjetil Nørvåg, Eirik Eide, and Odin Hole Standal, Query Planning in P2P Database Systems, Proceedings of IEEE International Conference on Digital Information Management (ICDIM 2007), Lyon, France, October 2007.

  90. Norvald H. Ryeng and Kjetil Nørvåg, Accuracy of Aggregation in Peer-to-Peer DBMSs, Proceedings of the 5th International Workshop on Databases, Information Systems and Peer-to-Peer Computing (DBISP2P 2007, in conjunction with VLDB'2007), September 2007.

  91. Christos Doulkeridis, Kjetil Nørvåg, and Michalis Vazirgiannis, Scalable Semantic Overlay Generation for P2P-Based Digital Libraries, Proceedings of the 10th European Conference on Digital Libraries (ECDL'2006), Alicante, Spain, September 2006.

  92. Christos Doulkeridis, Kjetil Nørvåg, and Michalis Vazirgiannis, Schema Caching for Improved XML Query Processing in P2P Systems, Proceedings of the 6th IEEE International Conference on Peer to Peer Computing, Cambridge, UK, September 2006.

  93. Kjetil Nørvåg, Trond Øivind Eriksen, and Kjell-Inge Skogstad, Mining Association Rules in Temporal Document Collections, Proceedings the 16th International Symposium on Methodologies for Intelligent Systems (ISMIS'2006), Bari, Italy, September 2006.

  94. Kjetil Nørvåg, DASCOSA: Database Support for Computational Science Applications, Proceedings of the 3rd International Workshop on Grid and Peer-to-Peer Computing Impacts on Large Scale Heterogeneous Distributed Database Systems (GLOBE'06), Krakow, Poland, September 2006.

  95. Kjetil Nørvåg, Christos Doulkeridis, and Michalis Vazirgiannis, Taxonomy Caching: A Scalable Low-Cost Mechanism for Indexing Remote Contents in Peer-to-Peer Systems, Proceedings of IEEE International Conference on Pervasive Services 2006 (ICPS06), Lyon, France, June 2006.

  96. Kjetil Nørvåg and Albert Overskeid Nybø, DyST: Dynamic and Scalable Temporal Text Indexing, Proceedings of the 13th International Symposium on Temporal Representation and Reasoning (TIME'2006), Budapest, Hungary, June 2006.

  97. Kjetil Nørvåg and Albert Overskeid Nybø, Creating synthetic temporal document collections for Web Archive Benchmarking, Proceedings of the 4th Atlantic Web Intelligence Conference (AWIC'2006), Beer-Sheva, Israel, June 2006.

  98. Christos Doulkeridis, Kjetil Nørvåg, and Michalis Vazirgiannis, The SOWES Approach to P2P Web Search using Semantic Overlays, Proceedings of the 15th World Wide Web Conference World Wide Web, Edinburgh, Scotland, UK, May 2006.

  99. Michalis Vazirgiannis, Kjetil Nørvåg, and Christos Doulkeridis, Peer-to-Peer Clustering for Semantic Overlay Network Generation, Proceedings of the Sixth International Workshop on Pattern Recognition in Information Systems (PRIS-2006, co-located with ICEIS 2006), Paphos, Cyprus, May 2006.

  100. Kjetil Nørvåg and Randi Øyri, News Item Extraction for Text Mining in Web Newspapers, Proceedings of International Workshop on Challenges in Web Information Retrieval and Integration (in conjunction with ICDE'2005), Tokyo, Japan, IEEE Computer Society April 2005.

  101. Kjetil Nørvåg and Albert Overskeid Nybø, Improving space-efficiency in temporal text-indexing, Proceedings of the 10th International Conference on Database Systems for Advanced Applications (DASFAA 2005), Beijing, China, Springer Verlag April 2005.

  102. Albrecht Schmidt and Kjetil Nørvåg, XML Database Application Development through a Stepwise Refinement Prototyping Process, Proceedings of ICEIS'2004, pages 370-375 (Vol 1), April 2004.

  103. Efstratios Valavanis, Christopher Ververidis, Michalis Vazirgiannis, George C. Polyzos, and Kjetil Nørvåg, MobiShare: Sharing Context-Dependent Data & Services from Mobile Sources, Proceedings of the 2003 IEEE/WIC International Conference on Web Intelligence (WI 2003), pages 263-270, Halifax, Canada, IEEE Computer Society October 2003.

  104. Kjetil Nørvåg, Space-Efficient Support for Temporal Text Indexing in a Document Archive Context, Proceedings of the 7th European Conference on Digital Libraries (ECDL'2003), pages 511-522, Trondheim, Norway, Springer Verlag August 2003.

  105. Kjetil Nørvåg, V2: A Database Approach to Temporal Document Management, Proceedings of the 7th International Database Engineering and Applications Symposium (IDEAS'2003), pages 212-223, Hong Kong, China, IEEE Computer Society July 2003.

  106. Kjetil Nørvåg, Marit Limstrand, and Lene Myklebust, TeXOR: Temporal XML Database on an Object-Relational Database System, Proceedings of Perspectives of System Informatics (PSI'03), Novosibirsk, Russia, July 2003. Revised version later published in post-conference proceedings by Springer Verlag (Lecture Notes in Computer Science; Vol 2890, pages 520-530).

  107. Kjetil Nørvåg, The V2 Temporal Document Database System, Poster Proceedings of the Twelfth International World Wide Web Conference (WWW2003), Budapest, Hungary, May 2003.

  108. Kjetil Nørvåg, Temporal XML Data Warehouses: Challenges and Solutions, Proceedings of Workshop on Knowledge Foraging for Dynamic Networking of Communities and Economies, Shiraz, Iran, October 2002.

  109. Kjetil Nørvåg, Algorithms for Temporal Query Operators in XML Databases, Proceedings of XML-Based Data Management Workshop (XMLDM) (in conjunction with EDBT'2002), pages 36-47, Prague, Czech Republic, March 2002. Revised version later published in post-conference proceedings by Springer Verlag (Lecture Notes in Computer Science; Vol 2490, pages 169-183).

  110. Kjetil Nørvåg, Temporal Query Operators in XML Databases, Proceedings of the 2002 ACM Symposium on Applied Computing (SAC'2002), pages 402-406, Madrid, Spain, ACM March 2002.

  111. Kjetil Nørvåg, Object and Log Management in Temporal Log-Only Object Database Systems, Advances in Databases and Information Systems (Proceedings of ADBIS'2001), pages 210-224, , Lithuania. Springer Verlag (Lecture Notes in Computer Science; Vol 2151) 2001.

  112. Kjetil Nørvåg, A Comparative Study of Log-Only and In-Place Update Based Temporal Object Database Systems, Proceedings of the Ninth ACM Conference on Information and Knowledge Management (ACM CIKM'2000), pages 496-503, Washington D.C., USA, ACM November 2000.

  113. Kjetil Nørvåg, The Vagabond Temporal OID Index: An Index Structure for OID Indexing in Temporal Object Database Systems, Proceedings of the 2000 International Database Engineering and Applications Symposium (IDEAS), pages 158-166, Yokohama, Japan, IEEE Computer Society September 2000.

  114. Kjetil Nørvåg, Design Issues in Transaction-Time Temporal Object Database Systems, Current Issues in Databases and Information Systems (Proceedings of ADBIS-DASFAA 2000), pages 371-378, Prague, Czech Republic. Springer Verlag (Lecture Notes in Computer Science; Vol 1884) 2000.

  115. Kjetil Nørvåg, Main-Memory Management in Temporal Object Database Systems, Current Issues in Databases and Information Systems (Proceedings of ADBIS-DASFAA 2000), pages 362-370, Prague, Czech Republic. Springer Verlag (Lecture Notes in Computer Science; Vol 1884) 2000.

  116. Kjetil Nørvåg, A Performance Evaluation of Log-Only Temporal Object Database Systems, Proceedings of the 12th International Conference on Scientific and Statistical Database Management, SSDBM 2000, Berlin, Germany, IEEE Computer Society July 2000.

  117. Kjetil Nørvåg, An Approach to High-Performance Scalable Temporal Object Storage, Proceedings of the Workshop on High Performance Object Databases (HiPOD'2000), Cardiff, UK, July 2000.

  118. Kjetil Nørvåg, The Persistent Cache: Improving OID Indexing in Temporal Object-Oriented Database Systems, Proceedings of the 25th International Conference on Very Large Databases (VLDB'99), pages 66-77, Edinburgh, Scotland, UK, 1999.

  119. Kjetil Nørvåg, Efficient Use of Signatures in Object-Oriented Database Systems, Proceedings of Advances in Databases and Information Systems (ADBIS'99), pages 367-381, Maribor, Slovenia. Springer Verlag (Lecture Notes in Computer Science; Vol 1691) 1999.

  120. Kjetil Nørvåg and Kjell Bratbergsengen, Optimizing OID Indexing Cost in Temporal Object-Oriented Database Systems, Proceedings of FODO'98, The 5th International Conference on Foundations of Data Organization, pages 137-146, Kobe, Japan, 1998.

  121. Kjetil Nørvåg and Kjell Bratbergsengen, An Analytical Study of Object Identifier Indexing, Proceedings of DEXA'98, 9th International Conference on Database and Expert Systems Applications, pages 38-49, Vienna, Austria. Springer (Lecture Notes in Computer Science; Vol 1460) 1998.

  122. Kjetil Nørvåg and Kjell Bratbergsengen, Write Optimized Object-Oriented Database Systems, Proceedings of the XVII International Conference of the Chilean Computer Science Society, SCCC'97, pages 164-173, Valparaiso, Chile. IEEE Computer Society 1997.

  123. Kjetil Nørvåg and Kjell Bratbergsengen, Log-Only Temporal Object Storage, Proceedings of the 8th International Workshop on Database and Expert Systems Applications, DEXA'97, pages 728-733, Toulouse, France. IEEE Computer Society 1997.

  124. Kjetil Nørvåg, Olav Sandstå, and Kjell Bratbergsengen, Concurrency Control in Distributed Object-Oriented Database Systems, Proceedings of ADBIS'97, pages 9-17, St.-Petersburg, Russia, 1997. Later also published in Advances in Databases and Information Systems, Electronic Workshops in Computing (eWiC), Springer-Verlag.

  125. Kjell Bratbergsengen and Kjetil Nørvåg, Improved and Optimized Partitioning Techniques in Database Query Processing, Proceedings of BNCOD15, pages 69-83, London, United Kingdom. Springer Verlag (Lecture Notes in Computer Science; Vol 1271), 1997.

  126. Kjetil Nørvåg and Olav Sandstå, Concurrency Control in Distributed Page-Server Systems, Proceedings of 3rd International Symposium on Programming and Systems, pages 44-56, Alger, Algerie, 1997.

  127. Kjetil Nørvåg and Kjell Bratbergsengen, Aggregate and Grouping Functions in Object-Oriented Databases, Proceedings of the XVI International Conference of the Chilean Computer Science Society, SCCC'96, pages 67-76, Valdivia, Chile, 1996.

  128. Kjetil Nørvåg, Neurocomputer Taxonomies, Proceedings of the World Congress on Neural Networks 1994, pages 596-600 (Vol. II), San Diego, 1994

National Conferences

  1. Mei Saouk, Christos Doulkeridis, Akrivi Vlachou, and Kjetil Nørvåg, Efficient Processing of Top-k Joins in MapReduce, Proceedings of HDMS'2017, Athens, Greece, August 2017.

  2. Orestis Gkorgkas, Akrivi Vlachou, Christos Doulkeridis and Kjetil Nørvåg, Maximizing Influence of Spatio-Textual Objects Based on Keyword Selection, Proceedings of HDMS'2016, Athens, Greece, July 2016.

  3. Orestis Gkorgkas, Akrivi Vlachou, Christos Doulkeridis, Kjetil Nørvåg, Finding the Most Diverse Products using Preference Queries, Proceedings of HDMS'2015, Athens, Greece, July 2015.

  4. Akrivi Vlachou, Christos Doulkeridis, Kjetil Nørvåg, and Yannis Kotidis, Branch-and-Bound Algorithm for Reverse Top-k Queries, Proceedings of HDMS'2014, Athens, Greece, July 2014.

  5. João Batista da Rocha Junior, Akrivi Vlachou, Christos Doulkeridis and Kjetil Nørvåg, Efficient Algorithms for Top-k Spatial Preference Queries, Proceedings of HDMS'2012, Chania, Greece, June 2012.

  6. Robert Neumayer, Krisztian Balog, Marek Ciglan, Wei Wei and Kjetil Nørvåg, Semantic Search for Entities in Structured Web Data: NTNU at the Yahoo Semantic Search Challenge 2011, Proceedings of Norsk Informatikkonferanse, Tromsø, Norway, November 2011.

  7. Marek Ciglan and Kjetil Nørvåg, Anotacia ad-hoc dopytov pre semanticke vyhladavanie zoznamov entit, Proceedings of 6th Workshop on Intelligent and Knowledge oriented Technologies (WIKT'2011), Herlany, Slovakia, November 2011.

  8. Akrivi Vlachou, Christos Doulkeridis, Kjetil Nørvåg and Yannis Kotidis, Using Reverse Top-k Queries for Identifying the Most Influential Data Objects, Proceedings of HDMS'2011, Athens, Greece, July 2011

  9. Akrivi Vlachou, Christos Doulkeridis, Yannis Kotidis and Kjetil Nørvåg Efficient Algorithms for Reverse Top-k Queries, Proceedings of HDMS'2010, Agia Napa, Cyprus, July 2010

  10. Akrivi Vlachou, Christos Doulkeridis, Kjetil Nørvåg, and Michalis Vazirgiannis, Efficient Processing of Top-k Queries in P2P Networks, Proceedings of the 7th Hellenic Data Management Symposium (HDMS'08), Heraklion, Greece, July 2008

  11. Kjetil Nørvåg, Christos Doulkeridis, and Michalis Vazirgiannis, The SOWES Approach to P2P Web Search using Semantic Overlays, Proceedings of the 5th Hellenic Data Management Symposium (HDMS'06), Thessaloniki, Greece, September 2006

  12. Kjetil Nørvåg, Reducing the Cost of Perfect Match Accesses in Object Database Systems, Proceedings of Norsk Informatikkonferanse, Tromsø, Norway, November 2001.

  13. Kjetil Nørvåg, The Vagabond Parallel Temporal Object-Oriented Database System: Versatile Support for Future Applications, Proceedings of Norsk Informatikkonferanse, pages 175-186, Trondheim, Norway, 1999.

  14. Kjell Bratbergsengen and Kjetil Nørvåg, Optimizing Hash Partitioning in Relational Algebra, Proceedings of Norsk Informatikkonferanse 1996, Alta, Norway, November 1996.

Thesis

  • Kjetil Nørvåg, Vagabond: The Design and Analysis of a Temporal Object Database Management System, Dr.ing. thesis, Norwegian University of Science and Technology, August 2000. (abstract, postscript, gzip'ed postscript,pdf)

  • Unrefereed Papers and Technical Reports Containing Additional Unpublished Material

  • Kjetil Nørvåg et al., Computer Systems: Position Paper for InfoSam2020, Proceedings of The Information Society of 2020 -an exercise in planning for the future (InfoSam2020), Trondheim, Norway, April 2004.

  • Kjetil Nørvåg, An Introduction to Fault-Tolerant Systems, Technical Report IDI-6/99, March 1999.

  • STUDENTS ADVISED

    PhD Students

    M.Sc. Students

    SCIENTIFIC SERVICE

    Service

    Program Commitees

    ACTIVITIES

    LECTURING EXPERIENCE

    In addition, I also give PhD courses (run as seminars) on the following topics: LANGUAGES

    Fluent in English, written and oral. Have a very good understanding of other Scandinavian languages.

    HOBBIES AND INTERESTS

    Traveling (have currently visited over over 70 countries and 25 Greek islands), photography, music, literature, Latin American history and politics, Greece.