Publications of Alexandros Ntoulas

Journal Publications

• Rapid Detection of Local Communities in Graph Streams.
  P. Liakos, K. Papakonstantinopoulou, A. Ntoulas, A. Delis.
  Accepted for publication, to appear in IEEE Transactions of Knowledge and Data Engineering (TKDE), August 2020.

• Uncovering Local Hierarchical Overlapping Communities at Scale.
  P. Liakos, A. Ntoulas, and A. Delis.
  In IEEE Transactions on Big Data, September 2019.

• Focused Crawling for the Hidden Web.
  P. Liakos, A. Ntoulas, A. Labrinidis, A. Delis.
  World Wide Web Journal (WWWJ), vol 19, no 4, pages 605–631, February 2016.

• Organizing User Search Histories.
  H. Hwang, H. Lauw, L. Getoor, A. Ntoulas.
  IEEE Transactions on Knowledge and Data Engineering (TKDE), vol 24, no 5, pages 912-925, 2012.

• Homophily in the Digital World: A LiveJournal Case Study.
  H. Lauw, J. Shafer, R. Agrawal, A. Ntoulas.
  IEEE Internet Computing, vol 14, no 2, pages 15-23, April 2010.

• Search Personalization through Query and Page Topical Analysis.
  S. Stamou, A. Ntoulas.
  User Modeling and User-Adapted Interaction (UMAI) Journal, vol. 18, no 5, pages 5-33, December 2008.

• Modeling and Managing Content Changes in Text Databases.
  P. Ipeirotis, A. Ntoulas, J. Cho, and L. Gravano.
  ACM Transactions on Database Systems (TODS), vol. 32, no. 3, pages 1-35, September 2007.

• The Infocious Web Search Engine: Improving Web Searching through Linguistic Analysis.
  A. Ntoulas, G. Chao, J. Cho.
  Journal of Digital Information Management (JDIM), vol. 5, no. 5, pages 277-291, October 2007.

Conference Publications

• DiCeS: Detecting Communities in Network Streams Over the Cloud.
  P. Liakos, K. Papakonstantinopoulou, A. Ntoulas, and A. Delis.
  In Proceedings of the IEEE CLOUD Conference, 2019, Milan, Italy.
  (20% accepted).

• CoEuS: Community Detection via Seed-set Expansion on Graph Streams.
  P. Liakos, A. Ntoulas, A. Delis.
  Proceedings of the IEEE Big Data Conference, 2017, Boston, MA.
  (16% accepted).

• Rhea: Adaptively Sampling Authoritative Content from Social Activity Streams.
  P. Liakos, A. Ntoulas, A. Delis.
  Proceedings of the IEEE Big Data Conference, 2017, Boston, MA.
  (16% accepted).

• Scalable Link Community Detection: A Local Dispersion-aware Approach.
  P. Liakos, A. Ntoulas, A. Delis.
  Proceedings of the IEEE Big Data Conference, 2016, Washington, DC.
  (18% accepted).

• Efficient Online Novelty Detection in News Streams.
  M. Karkali, F. Rousseau, A. Ntoulas, M. Vazirgiannis.
  In Proceedings of the International Conference on Web Information System Engineering, 2013, Nanjing, China.
  (18% accepted).

• SocWeb: Efficient Monitoring of Social Network Activities.
  F. Psallidas, A. Ntoulas, A. Delis.
  In Proceedings of the International Conference on Web Information System Engineering, 2013, Nanjing, China.
  (18% accepted).

• Topic Sensitive Hidden-Web Crawling.
  P. Liakos, A. Ntoulas.
  In Proceedings of the International Conference on Web Information System Engineering, 2012, Paphos, Cyprus.
  (18% accepted).

• PocketWeb: Instant Web browsing for mobile devices.
  D. Lymberopoulos, O. Riva, K. Strauss, A. Mittal, A. Ntoulas.
  In Proceedings of the International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS), 2012, London, UK.
  (21% accepted).

• Selecting a comprehensive set of reviews.
  P. Tsaparas, A. Ntoulas, E. Terzi.
  In Proceedings of the International Conference of Knowledge Discovery and Data Mining (KDD), 2011, San Diego, CA.
  (17% accepted).

• Indexing Strategies for graceful degradation of search quality.
  S. Ding, S. Gollapudi, S. Ieong, K. Kenthapadi, A. Ntoulas.
  In Proceedings of the ACM International Information Retrieval (SIGIR) Conference, 2011, Beijing, China.
  (19% accepted).

• Efficient Query Rewrite for Structured Web Queries
  S. Gollapudi, S. Ieong, A. Ntoulas, S. Paparizos
  In Proceedings of the International Conference on Information and Knowledge Management (CIKM), 2011, Glasgow, UK.
  (12% accepted).

• Exploiting Social Context for Review Quality Prediction.
  Y. Lu, P. Tsaparas, A. Ntoulas, L. Polanyi.
  In Proceedings of the World Wide Web (WWW) Conference, 2010, Raleigh, NC.
  (12% accepted)

• Releasing Search Queries and Clicks Privately.
  A. Korolova, K. Kenthapadi, N. Mishra, A. Ntoulas.
  In Proceedings of the World Wide Web (WWW) Conference, 2009, Madrid, Spain.
  Runner-up for Best Paper Award (11% accepted)

• Answering Web Queries using Structured Data Sources.
  S. Paparizos, A. Ntoulas, J. Shafer, R. Agrawal.
  In Proceedings of the SIGMOD Conference, 2009, Providence, RI.
  

• Answering Bounded Continuous Search Queries in the World Wide Web.
  D. Kukulenz, A. Ntoulas.
  In Proceedings of the World Wide Web (WWW) Conference, 2007, Banff, Canada.
  (15% accepted)

• Pruning Policies for Two-Tiered Inverted Index with Correctness Guarantee.
  A. Ntoulas, J. Cho.
  In Proceedings of the ACM International Information Retrieval (SIGIR) Conference, 2007, Amsterdam, Netherlads.
  (17% accepted)

• Detecting Spam Web Pages through Content Analysis.
  A. Ntoulas, M. Najork, M. Manasse, D. Fetterly.
  In Proceedings of the World Wide Web (WWW) Conference, 2006, Edinburgh, Scotland.
  (11% accepted)

• Classifying Web Data in Directory Structures.
  S. Stamou, A. Ntoulas, V. Krikos, P. Kokosis, D. Christodoulakis.
  In Proceedings of the 8th Asia Pacific Web Conference (APWeb), January 16-18, Harbin, China, LNCS 3841, Springer-Verlag, pp. 238-249, 2006.
  (14% accepted)

• Modeling and Managing Content Changes in Text Databases.
  P. Ipeirotis, A. Ntoulas, J. Cho, L. Gravano.
  In Proceedings of the IEEE International Conference on Data Engineering (ICDE), 2005, Tokyo, Japan.
  Best Paper Award (13% accepted)

• The Infocious Web Search Engine: Improving Web Searching through Linguistic Analysis.
  A. Ntoulas, G. Chao, J. Cho.
  In Proceedings of the World Wide Web (WWW) Conference, 2005, Chiba, Japan.
  (20% accepted)

• Downloading Textual Hidden Web Content through Keyword Queries.
  A. Ntoulas, P. Zerfos, J. Cho.
  In Proceedings of the Joint Conference on Digital Libraries (JCDL), 2005, Denver, CO.
  (31% accepted)

• A study on the evolution of the Web.
  A. Ntoulas, J. Cho, H. K. Cho, H. Cho, Y.J. Cho.
  In Proceedings of the US - Korea Conference on Science, Technology, & Entrepreneurship (UKC), 2005, Irvine, CA.

• Web Directory Construction using Lexical Chains.
  S. Stamou, V. Krikos, P. Kokosis, A. Ntoulas, D. Christodoulakis.
  In Proceedings of the International Conference on Applications of Natural Language to Databases (NLDB), 2005, Alicante, Spain.
  (32% accepted)

• What's New on the Web? The Evolution of the Web from a Search Engine Perspective.
  A. Ntoulas, J. Cho, C. Olston.
  In Proceedings of the World Wide Web (WWW) Conference, 2004, New York, NY.
  (14% accepted)

• Effective Change Detection using Sampling.
  J. Cho, A. Ntoulas.
  In Proceedings of the International Conference on Very Large Databases (VLDB), 2002, Hong Kong, China.
  (16% accepted)

• Expanding EuroWordNet with Domain-Specific Terminology Using Common Lexical Resources: Vocabulary Completeness and Coverage Issues.
  S. Stamou, A. Ntoulas, M. Kyriakopoulou, D. Christodoulakis.
  In Proceedings of the 1st Global Wordnet Conference (GWC), 2002, Mysore, India.

• EUROTERM: Extending the EuroWordNet with Domain-Specific Terminology Using an Expand Model Approach.
  S. Stamou, A. Ntoulas, J. Hoppenbrouwers, M. Saiz-Noeda, D. Christodoulakis.
  In Proceedings of the 1st Global Wordnet Conference (GWC), 2002, Mysore, India.

• Understanding Search Engines: Requirements for Explaining Search Results.
  A. Ntoulas, S. Stamou, M. Tzagarakis, D. Christodoulakis.
  In Proceedings of the 1st Panhellenic Conference with International Participation in Human Computer Interaction (PCHCI), 2001, Patras, Greece.

• Viewing Web Search Engines as Corpus Query Systems.
  A. Ntoulas, S. Stamou, M. Tzagarakis, I. Tsakou, D. Christodoulakis.
  In Proceedings of the 6th Conference in Computational Lexicography and Corpus. Research (COMPLEX), Mason Hall, University of Birmingham, June 28-30, Birmingham, UK, 2001.

• Athena: A user-friendly computer tool for the construction and management of language exercises.
  A. Ntoulas, N. Arvanitakis, A. Iordanidou.
  National Conference School Knowledge and Teaching in Primary Education, 2001, Ioannina, Greece.

• Use of a Morphosyntactic Lexicon for the Implementation of the Greek Wordnet.
  A. Ntoulas, S. Stamou, I. Tsakou, C. Tsalidis, M. Tzagarakis, A. Vagelatos.
  In Proceedings of the 2nd International Conference on Natural Language Processing (NLP), 2000, Patras, Greece.

Workshop Publications

• Rank-aware crawling of Hidden-Web sites.
  G. Valkanas, A. Ntoulas, G. Gunopulos.
  In Proceedings of the SIGMOD 2011 International Workshop on the Web and Databases, Athens, Greece.

• Estimating the Quality of Postings in the Real-time Web
  H. Lauw, A. Ntoulas, K. Kenthapadi.
  WSDM 2010 Workshop on Search in Social Media (SSM 2010), New York, NY.

• DirectoryRank: Ordering Pages in Web Directories.
  V. Krikos, S. Stamou, A. Ntoulas, P. Kokosis, D. Christodoulakis.
  In Proceedings of the 7th ACM International Workshop on Web Information and Data Management (WIDM05), Bremen, Germany, 2005.
  (27% accepted)

• Using a WWW Search Engine to Evaluate Normalization Performance for a Highly Inflectional Language.
  A. Ntoulas, S. Stamou, M. Tzagarakis.
  In Proceedings of the ACL/EACL Student Research Workshop, July 6-11, Toulouse, France, 2001.
  (27% accepted)

• A Modular Architecture for the Storage and Management of Heterogeneous Lexical Information.
  D. Assimakopoulos, I. Koutsoubos, M. Miatidis, I. Tsakou, A. Ntoulas, S. Stamou, D. Christodoulakis.
  In Proceedings of the Computational Lexicography Workshop (COMLEX), 2000, Patras, Greece.

Book Chapters

• Web Search.
  A. Ntoulas, M. Vazirgiannis.
  Special Volume prepared by the Hellenic Artificial Intelligence Society, 2008.
• TODE: An Ontology-Based Model for the Dynamic Population of Web Directories.
  S. Stamou, A. Ntoulas, D. Christodoulakis.
  Data Mining with Ontologies: Implementations, Findings and Frameworks. Published by the Idea Group Inc., 2007.

Patents

• Server-to-server integration of tracking events.
  Granted 09/01/2020. US Patent No. 10,764,382.

• Automated tuning of computer-implemented games.
  Granted 08/04/2020. US Patent No. 10,729,979.

• Adjusting object adaptive modification or game level difficulty and physical gestures through level definition files.
  Granted 02/18/2020. US Patent No. 10,561,944.

• Automated game modification based on playing style.
  Granted 02/11/2020. US Patent No. 10,556,182.

• Dynamic virtual environment customization based on user behavior clustering.
  Granted 06/11/2019. US Patent No. 10,315,116.

• Automated tuning of computer-implemented games.
  Granted 10/23/2018. US Patent No. 10,105,603.

• Relaxation for structured queries.
  Granted 10/13/2015. US Patent No. 9,158,813.

• Assessing the quality of user reviews.
  Granted 3/24/2015. US Patent No. 8,990,124.

• Answering web queries using structured data sources.
  Granted 9/9/2014. US Patent No. 8,832,133.

• Synopsis of a search log that respects user privacy.
  Granted 12/3/2013. US Patent No. 8,601,024.

• Indexing for limited search server availability.
  Granted 6/4/2013. US Patent No. 8,458,130.

• Grammar Compression.
  Granted 5/21/2013. US Patent No. 8,447,736.

• Grammar Compression.
  Granted 9/27/2011. US Patent No. 8,027,957.

• Using content analysis to detect spam web pages.
  Granted 6/14/2011. US Patent No. 7,962,510.

• Method and Apparatus for Retrieving and Indexing Hidden Web Pages.
  Granted 3/23/2010. US Patent No. 7,685,112.

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• antoulas -*at*- di.uoa.gr
• +30 210 727 5325
• Office: A45
  Department of Informatics
  and Telecommunications
  University of Athens
  GR15703, Athens, Greece