Matthias Hagen

Bauhaus-Universität Weimar
Bauhausstraße 11 · Room 207
99423 Weimar, Germany

Email: matthias.hagen[at]uni-weimar.de
Phone: +49 (0)3643 - 58 3746

Short Curriculum Vitae

Matthias Hagen is Juniorprofessor at the Bauhaus-Universität Weimar and head of the junior research group "Big Data Analytics." His current research interests include information retrieval and web search (e.g., query formulation, query segmentation, log analysis, search sessions and missions), Big Data, crowdsourcing, and text reuse.

Professional background: Matthias Hagen studied computer science at the Friedrich-Schiller-Universität Jena (FSU). After completing his diploma thesis in June 2004 he joined the research group of Prof. Martin Mundhenk at FSU and worked on algorithmic and computational complexity problems concerning the equivalence test of monotone Boolean formulas and transversal hypergraph generation. In February 2007 Matthias Hagen also joined the research group Programming Languages / Methodologies of Prof. Claudia Fohry at the University of Kassel. There he worked on the optimization of the wiring harness in cars together with specialists from Volkswagen, Continental, and Sumitomo within the OBA project. In November 2008, Matthias Hagen defended his PhD thesis on "Algorithmic and Computational Complexity Issues of MONET" at FSU and moved to the working group Web Technology and Information Systems at the Bauhaus-Universität Weimar. There he was head of the junior research group "Intelligentes Lernen" (intelligent learning) fundet by the BMBF.

Since November 2013, Matthias Hagen is Juniorprofessor for "Big Data Analytics" and head of a respective junior research group funded by the BMBF in the InnoProfile-Transfer program. The group is focusing on retrieval, mining and visualization in the context of big data.

Publications

Johannes Kiesel, Florian Kneist, Milad Alshomary, Benno Stein, Matthias Hagen, Martin Potthast. Reproducible Web Corpora: Interactive Archiving with Automatic Quality Assessment. Journal of Data and Information Quality, 2018. [bib]
Martin Potthast, Tim Gollub, Kristof Komlossy, Sebastian Schuster, Matti Wiegmann, Erika Patricia Garces Fernandez, Matthias Hagen and Benno Stein. Crowdsourcing a Large Corpus of Clickbait on Twitter. In Proceedings of the 27th International Conference on Computational Linguistics (COLING 2018) (to appear) , August 2018. The COLING 2018 Organizing Committee. [bib]
Johannes Kiesel, Arjen P. de Vries, Matthias Hagen, Benno Stein, Martin Potthast. WASP: Web Archiving and Search Personalized. In Proceedings of the 1st Conference on the Design of Experimental Search & Information REtrieval Systems (DESIRES 2018), August 2018. CEUR-WS.org. [paper] [bib]
Wei-Fan Chen, Matthias Hagen, Benno Stein, Martin Potthast. A User Study on Snippet Generation: Text Reuse vs. Paraphrases. In The 41st International ACM SIGIR Conference on Research & Development in Information Retrieval, New York, NY, USA, 2018. ACM. [paper] [bib] [poster]
Johannes Kiesel, Arefeh Bahrami, Benno Stein, Avishek Anand, and Matthias Hagen. Toward Voice Query Clarification. In Proceedings of the 41st International ACM SIGIR Conference on Research and Development in Information Retrieval, July 2018. ACM. [paper] [bib]
Khalid Al-Khatib, Henning Wachsmuth, Kevin Lang, Jakob Herpel, Matthias Hagen, and Benno Stein. Modeling Deliberative Argumentation Strategies on Wikipedia. In Proceedings of 56th Annual Meeting of the Association for Computational Linguistics (ACL 18) (to appear) , July 2018. Association for Computational Linguistics. [paper] [bib]
Janek Bevendorff, Benno Stein, Matthias Hagen, and Martin Potthast. Elastic ChatNoir: Search Engine for the ClueWeb and the Common Crawl. In Advances in Information Retrieval. 40th European Conference on IR Research (ECIR 18), Lecture Notes in Computer Science, Berlin Heidelberg New York, March 2018. Springer. [paper] [bib]
Martin Potthast, Wei-Fan Chen, Matthias Hagen, and Benno Stein. A Plan for Ancillary Copyright: Original Snippets. In Dyaa Albakour et al, editors, Proceedings of the Second International Workshop on Recent Trends in News Information Retrieval (NewsIR 18) co-located with 40th European Conference on Information Retrieval (ECIR 18) volume 2079 of CEUR Workshop Proceedings, pages 3-5, March 2018. CEUR-WS.org. ISSN 1613-0073. [publisher] [paper] [bib] [slides] [poster]
Shahbaz Syed, Tim Gollub, Marcel Gohsen, Nikolay Kolyada, Benno Stein, and Matthias Hagen. Cross-Reading News. In Dyaa Albakour et al, editors, Proceedings of the Second International Workshop on Recent Trends in News Information Retrieval (NewsIR 18) co-located with 40th European Conference on Information Retrieval (ECIR 18) volume 2079 of CEUR Workshop Proceedings, pages 24-26, March 2018. CEUR-WS.org. ISSN 1613-0073. [publisher] [paper] [bib]
Matthias Hagen, Martin Potthast, Payam Adineh, Ehsan Fatehifar, and Benno Stein. Source Retrieval for Web-Scale Text Reuse Detection. In Ee-Peng Lim et al, editors, Proceedings of the 26th ACM International Conference on Information and Knowledge Management (CIKM 17), pages 2091-2094, November 2017. ACM. [doi] [paper] [bib]
Matthias Hagen, Yamen Ajjour, Johannes Kiesel, Payam Adineh, and Benno Stein. Webis at TREC 2017: Open Search and Core Tracks. In Ellen M. Voorhees and Lori P. Buckland, editors, 26th International Text Retrieval Conference (TREC 17), NIST Special Publication, November 2017. National Institute of Standards and Technology (NIST). [publisher] [paper] [bib]
Matthias Hagen and Benno Stein. Encyclopedia of Social Network Analysis and Mining (ESNAM). Chapter Weblog Analysis, pages 1-9 Springer. 2017 [doi] [paper] [bib]
Matthias Hagen, Martin Potthast, and Benno Stein. Overview of the Author Obfuscation Task at PAN 2017: Safety Evaluation Revisited. In Linda Cappellato, Nicola Ferro, Lorraine Goeuriot, and Thomad Mandl, editors, Working Notes Papers of the CLEF 2017 Evaluation Labs volume 1866 of CEUR Workshop Proceedings, September 2017. CLEF and CEUR-WS.org. ISSN 1613-0073. [publisher] [paper] [bib]
Khalid Al-Khatib, Henning Wachsmuth, Matthias Hagen, and Benno Stein. Patterns of Argumentation Strategies across Topics. In Proceedings of the 2017 Conference on Empirical Methods in Natural Language Processing (EMNLP 17), pages 1362-1368, September 2017. Association for Computational Linguistics. [publisher] [paper] [bib]
Matthias Hagen, Johannes Kiesel, Milad Alshomary, and Benno Stein. Webis at the CLEF 2017 Dynamic Search Lab. In Linda Cappellato, Nicola Ferro, Lorraine Goeuriot, and Thomad Mandl, editors, Working Notes Papers of the CLEF 2017 Evaluation Labs volume 1866 of CEUR Workshop Proceedings, September 2017. CLEF and CEUR-WS.org. ISSN 1613-0073. [publisher] [paper] [bib]
Matthias Hagen, Martin Potthast, Marcel Gohsen, Anja Rathgeber, and Benno Stein. A Large-Scale Query Spelling Correction Corpus. In Noriko Kando et al, editors, 40th International ACM Conference on Research and Development in Information Retrieval (SIGIR 17), pages 1261-1264, August 2017. ACM. ISBN 978-1-4503-5022-8. [doi] [paper] [corpus] [bib] [poster]
Astrid Frey, Matthias Hagen, and Benno Stein. Anomalieerkennung im Bereich Industrie 4.0. Industrie 4.0 Management, 33 (4) : 53-56, 2017. [bib]
Johannes Kiesel, Martin Potthast, Matthias Hagen, and Benno Stein. Spatio-temporal Analysis of Reverted Wikipedia Edits. In Proceedings of the Eleventh International AAAI Conference on Web and Social Media (ICWSM 17), May 2017. [publisher] [paper] [bib] [code]
Khalid Al-Khatib, Henning Wachsmuth, Johannes Kiesel, Matthias Hagen, and Benno Stein. A News Editorial Corpus for Mining Argumentation Strategies. In Proceedings of the 26th International Conference on Computational Linguistics (COLING 16), pages 3433-3443, December 2016. [publisher] [paper] [corpus] [bib] [code] [poster]
Matthias Hagen, Maximilian Michel, and Benno Stein. Simulating Ideal and Average Users. In Proceedings of the 12th Asia Information Retrieval Societies Conference (AIRS 16), November 2016. [paper] [bib]
Tim Gollub, Matthias Busse, Benno Stein, and Matthias Hagen. Keyqueries for Clustering and Labeling. In Proceedings of the 12th Asia Information Retrieval Societies Conference (AIRS 16), November 2016. [paper] [bib]
Matthias Hagen, Johannes Kiesel, Payam Adineh, Masoud Alahyari, Ehsan Fatehifar, Arefeh Bahrami, Pia Fichtl, and Benno Stein. Webis at TREC 2016: Tasks, Total Recall, and Open Search Tracks. In Ellen M. Voorhees and Lori P. Buckland, editors, 25th International Text Retrieval Conference (TREC 16), NIST Special Publication, November 2016. National Institute of Standards and Technology (NIST). [publisher] [paper] [bib]
Matthias Hagen, Michael Völske, Steve Göring, and Benno Stein. Axiomatic Result Re-Ranking. In Proceedings of the 25th ACM International Conference on Information and Knowledge Management (CIKM 16), October 2016. ACM. [paper] [bib] [slides]
Martin Potthast, Matthias Hagen, and Benno Stein. Author Obfuscation: Attacking the State of the Art in Authorship Verification. In Working Notes Papers of the CLEF 2016 Evaluation Labs volume 1609 of CEUR Workshop Proceedings, September 2016. CLEF and CEUR-WS.org. ISSN 1613-0073. [publisher] [paper] [bib] [slides]
Khalid Al-Khatib, Henning Wachsmuth, Matthias Hagen, Jonas Köhler, and Benno Stein. Cross-Domain Mining of Argumentative Text through Distant Supervision. In 15th Conference of the North American Chapter of the Association for Computational Linguistics: Human Language Technologies (NAACL 16), pages 1395-1404, June 2016. Association for Computational Linguistics. [doi] [paper] [bib]
Matthias Hagen, Martin Potthast, Michael Völske, Jakob Gomoll, and Benno Stein. How Writers Search: Analyzing the Search and Writing Logs of Non-fictional Essays. In Diane Kelly et al, editors, Proceedings of the 1st ACM SIGIR Conference on Human Information Interaction and Retrieval (CHIIR 16), pages 193-202, March 2016. ACM. [doi] [paper] [bib] [slides]
Martin Potthast, Sebastian Köpsel, Benno Stein, and Matthias Hagen. Clickbait Detection. In Nicola Ferro et al, editors, Advances in Information Retrieval. 38th European Conference on IR Research (ECIR 16) volume 9626 of Lecture Notes in Computer Science, pages 810-817, Berlin Heidelberg New York, March 2016. Springer. [doi] [paper] [bib] [slides] [poster]
Matthias Hagen, Anna Beyer, Tim Gollub, Kristof Komlossy, and Benno Stein. Supporting Scholarly Search with Keyqueries. In Nicola Ferro et al, editors, Advances in Information Retrieval. 38th European Conference on IR Research (ECIR 16) volume 9626 of Lecture Notes in Computer Science, pages 507-520, Berlin Heidelberg New York, March 2016. Springer. [doi] [paper] [bib] [slides]
Martin Potthast, Sarah Braun, Tolga Buz, Fabian Duffhauss, Florian Friedrich, Jörg Marvin Gülzow, Jakob Köhler, Winfried Lötzsch, Fabian Müller, Maike Elisa Müller, Robert Paßmann, Bernhard Reinke, Lucas Rettenmeier, Thomas Rometsch, Timo Sommer, Michael Träger, Sebastian Wilhelm, Benno Stein, Efstathios Stamatatos, and Matthias Hagen. Who Wrote the Web? Revisiting Influential Author Identification Research Applicable to Information Retrieval. In Nicola Ferro et al, editors, Advances in Information Retrieval. 38th European Conference on IR Research (ECIR 16) volume 9626 of Lecture Notes in Computer Science, pages 393-407, Berlin Heidelberg New York, March 2016. Springer. [doi] [paper] [bib] [slides]
Matthias Hagen and Benno Stein. Big Data and IR. Datenbank-Spektrum. Springer, March 2016. ISSN 1618-2162. [doi] [bib]
Matthias Hagen, Steve Göring, Magdalena Keil, Olaoluwa Anifowose, Amir Othman, and Benno Stein. Webis at TREC 2015: Tasks and Total Recall Tracks. In Ellen M. Voorhees and Lori P. Buckland, editors, 24th International Text Retrieval Conference (TREC 15), NIST Special Publication, November 2015. National Institute of Standards and Technology (NIST). [publisher] [paper] [bib]
Michael Völske, Pavel Braslavski, Matthias Hagen, Galina Lezina, and Benno Stein. What Users Ask a Search Engine: Analyzing One Billion Russian Question Queries. In Proceedings of the 24th ACM International Conference on Information and Knowledge Management (CIKM 15), pages 1571-1580, October 2015. ACM. ISBN 978-1-4503-3794-6. [doi] [paper] [bib] [slides]
Matthias Hagen, Martin Potthast, and Benno Stein. Source Retrieval for Plagiarism Detection from Large Web Corpora: Recent Approaches. In Working Notes Papers of the CLEF 2015 Evaluation Labs, CEUR Workshop Proceedings, September 2015. CLEF and CEUR-WS.org. ISSN 1613-0073. [publisher] [paper] [bib]
Matthias Hagen, Martin Potthast, Michel Büchner, and Benno Stein. Webis: An Ensemble for Twitter Sentiment Detection. In Proceedings of the 9th International Workshop on Semantic Evaluation (SemEval 15), pages 582-589, June 2015. Association for Computational Linguistics. [publisher] [paper] [bib] [code]
Matthias Hagen, Maximilian Michel, and Benno Stein. What Was the Query? Automatically Generating Queries for Document Sets with Applications in Cluster Labeling. In Proceedings of the 19th International Conference on Applications of Natural Language to Information Systems (NLDB 15) volume 9103 of Lecture Notes in Computer Science, pages 124-133, Berlin Heidelberg New York, June 2015. Springer. [doi] [paper] [bib]
Johannes Kiesel, Khalid Al-Khatib, Matthias Hagen, and Benno Stein. A Shared Task on Argumentation Mining in Newspaper Editorials. In Proceedings of the 2nd Workshop on Argumentation Mining, pages 35-38, Denver, Colorado, June 2015. Association for Computational Linguistics. [publisher] [paper] [bib]
Matthias Hagen, Martin Potthast, Michel Büchner, and Benno Stein. Twitter Sentiment Detection via Ensemble Classification Using Averaged Confidence Scores. In Advances in Information Retrieval. 37th European Conference on IR Research (ECIR 15) volume 9022 of Lecture Notes in Computer Science, pages 513-525, Berlin Heidelberg New York, March 2015. Springer. [doi] [paper] [bib] [code] [slides]
Matthias Hagen, Daniel Wägner, and Benno Stein. A Corpus of Realistic Known-Item Topics with Associated Web Pages in the ClueWeb09. In Advances in Information Retrieval. 37th European Conference on IR Research (ECIR 15) volume 9022 of Lecture Notes in Computer Science, pages 741-754, Berlin Heidelberg New York, March 2015. Springer. [doi] [paper] [bib] [slides]
Matthias Hagen, Steve Göring, Maximilian Michel, Georg Müller, and Benno Stein. Webis at TREC 2014: Web, Session, and Contextual Suggestion Tracks. In Ellen M. Voorhees and Lori P. Buckland, editors, 23nd International Text Retrieval Conference (TREC 14), NIST Special Publication, November 2014. National Institute of Standards and Technology (NIST). [publisher] [paper] [bib]
Matthias Hagen and Benno Stein. Encyclopedia of Social Network Analysis and Mining (ESNAM). Chapter Weblog Analysis, pages 2355-2362 Springer. 2014 [doi] [paper] [bib]
Tim Gollub, Michael Völske, Matthias Hagen, and Benno Stein. Dynamic Taxonomy Composition via Keyqueries. In Proceedings of the 14th ACM/IEEE-CS Joint Conference on Digital Libraries (JCDL 14), pages 39-48, September 2014. ACM/IEEE. ISBN 978-1-4799-5569-5. [publisher] [paper] [bib]
Matthias Hagen and Christiane Glimm. Supporting More-Like-This Information Needs: Finding Similar Web Content in Different Scenarios. In Information Access Evaluation meets Multilinguality, Multimodality, and Visualization. 5th International Conference of the CLEF Initiative (CLEF 14), pages 50-61, 2014. [doi] [paper] [bib]
Michael Völske, Tim Gollub, Matthias Hagen, and Benno Stein. A Keyquery-Based Classification System for CORE. In Laurence Lannom, editors, 3rd International Workshop on Mining Scientific Publications (WOSP 2014) volume 20 of, September 2014. Corporation for National Research Initiatives (CNRI). ISSN 1082-9873. [doi] [paper] [bib]
Martin Potthast, Matthias Hagen, Anna Beyer, Matthias Busse, Martin Tippmann, Paolo Rosso, and Benno Stein. Overview of the 6th International Competition on Plagiarism Detection. In Linda Cappellato, Nicola Ferro, Martin Halvey, and Wessel Kraaij, editors, Working Notes Papers of the CLEF 2014 Evaluation Labs, CEUR Workshop Proceedings, September 2014. CLEF and CEUR-WS.org. ISSN 1613-0073. [publisher] [paper] [bib] [slides]
Benno Stein, Matthias Hagen, and Christof Bräutigam. Generating Acrostics via Paraphrasing and Heuristic Search. In Junichi Tsujii and Jan Hajic, editors, 25th International Conference on Computational Linguistics (COLING 14), pages 2018-2029, August 2014. Association for Computational Linguistics. [paper] [bib]
Martin Potthast, Matthias Hagen, Anna Beyer, and Benno Stein. Improving Cloze Test Performance of Language Learners Using Web N-Grams. In Junichi Tsujii and Jan Hajic, editors, 25th International Conference on Computational Linguistics (COLING 14), pages 962-973, August 2014. Association for Computational Linguistics. [paper] [bib]
Khaled M. Elbassioni, Matthias Hagen, and Imran Rauf. A Lower Bound for the HBC Transversal Hypergraph Generation. Fundamenta Informaticae, 130 (4) : 409-414, 2013. [article] [bib]
Matthias Hagen, Michael Völske, Jakob Gomoll, Marie Bornemann, Lene Ganschow, Florian Kneist, Abdul Hamid Sabri, and Benno Stein. Webis at TREC 2013 Sessions and Web Track. In Ellen M. Voorhees and Lori P. Buckland, editors, 22nd International Text Retrieval Conference (TREC 13), NIST Special Publication, November 2013. National Institute of Standards and Technology (NIST). [publisher] [paper] [bib]
Martin Potthast, Tim Gollub, Matthias Hagen, Martin Tippmann, Johannes Kiesel, Paolo Rosso, Efstathios Stamatatos, and Benno Stein. Overview of the 5th International Competition on Plagiarism Detection. In Pamela Forner, Roberto Navigli, and Dan Tufis, editors, Working Notes Papers of the CLEF 2013 Evaluation Labs, September 2013. ISBN 978-88-904810-3-1. ISSN 2038-4963. [publisher] [paper] [bib] [slides]
Martin Potthast, Matthias Hagen, Michael Völske, and Benno Stein. Exploratory Search Missions for TREC Topics. In Max L. Wilson et al, editors, 3rd European Workshop on Human-Computer Interaction and Information Retrieval (EuroHCIR 2013), pages 11-14, August 2013. CEUR-WS.org. ISSN 1613-0073. [publisher] [paper] [bib]
Martin Potthast, Matthias Hagen, Michael Völske, and Benno Stein. Crowdsourcing Interaction Logs to Understand Text Reuse from the Web. In Pascale Fung and Massimo Poesio, editors, Proceedings of the 51st Annual Meeting of the Association for Computational Linguistics (ACL 13), pages 1212-1221, August 2013. Association for Computational Linguistics. [publisher] [paper] [bib] [slides]
Tim Gollub, Matthias Hagen, Maximilian Michel, and Benno Stein. From Keywords to Keyqueries: Content Descriptors for the Web. In Cathal Gurrin et al, editors, 36th International ACM Conference on Research and Development in Information Retrieval (SIGIR 13), pages 981-984, July 2013. ACM. [doi] [paper] [bib]
Matthias Hagen, Jakob Gomoll, Anna Beyer, and Benno Stein. From Search Session Detection to Search Mission Detection. In 10th International Conference Open Research Areas in Information Retrieval (OAIR 13), pages 85-92, May 2013. ACM. [publisher] [paper] [bib] [slides]
Matthias Hagen, Martin Potthast, Matthias Busse, Jakob Gomoll, Jannis Harder, and Benno Stein. Webis at the TREC 2012 Sessions Track. In Ellen M. Voorhees and Lori P. Buckland, editors, 21st International Text Retrieval Conference (TREC 12), NIST Special Publication, November 2012. National Institute of Standards and Technology (NIST). [publisher] [paper] [bib] [slides]
Matthias Hagen, Martin Potthast, Anna Beyer, and Benno Stein. Towards Optimum Query Segmentation: In Doubt Without. In Xuewen Chen, Guy Lebanon, Haixun Wang, and Mohammed J. Zaki, editors, 21st ACM International Conference on Information and Knowledge Management (CIKM 12), pages 1015-1024, October 2012. ACM. ISBN 978-1-4503-1156-4. [doi] [paper] [bib] [slides]
Martin Potthast, Tim Gollub, Matthias Hagen, Jan Graßegger, Johannes Kiesel, Maximilian Michel, Arnd Oberländer, Martin Tippmann, Alberto Barrón-Cedeño, Parth Gupta, Paolo Rosso, and Benno Stein. Overview of the 4th International Competition on Plagiarism Detection. In Pamela Forner, Jussi Karlgren, and Christa Womser-Hacker, editors, Working Notes Papers of the CLEF 2012 Evaluation Labs, September 2012. ISBN 978-88-904810-3-1. ISSN 2038-4963. [publisher] [paper] [bib] [slides]
Claudia Hauff, Matthias Hagen, Anna Beyer, and Benno Stein. Towards Realistic Known-Item Topics for the ClueWeb. In Jaap Kamps et al, editors, 4th Information Interaction in Context Symposium (IIiX 12), pages 274-277, August 2012. ACM. ISBN 978-1-4503-1282-0. [doi] [paper] [bib]
Martin Potthast, Matthias Hagen, Benno Stein, Jan Graßegger, Maximilian Michel, Martin Tippmann, and Clement Welsch. ChatNoir: A Search Engine for the ClueWeb09 Corpus. In Bill Hersh, Jamie Callan, Yoelle Maarek, and Mark Sanderson, editors, 35th International ACM Conference on Research and Development in Information Retrieval (SIGIR 12), pages 1004, August 2012. ACM. ISBN 978-1-4503-1472-5. [doi] [paper] [bib]
Andre Schmidt, Michael Rzanny, Astrid Schmidt, Matthias Hagen, Eileen Schütze, and Erika Kothe. GC content-independent amino acid patterns in Bacteria and Archaea. Journal of Basic Microbiology, 52 (2) : 195-205, 2012. [bib]
Matthias Hagen, Jakob Gomoll, and Benno Stein. Improved Cascade for Search Mission Detection. In Ben Carterette, Evangelos Kanoulas, Paul D. Clough, and Mark Sanderson, editors, ECIR 12 Workshop on Information Retrieval over Query Sessions (SIR 12), April 2012. [publisher] [paper] [bib] [slides]
Matthias Hagen, Jan Graßegger, Maximilian Michel, and Benno Stein. Webis at the TREC 2011 Sessions Track. In Ellen M. Voorhees and Lori P. Buckland, editors, 20th International Text Retrieval Conference (TREC 11), November 2011. National Institute of Standards and Technology (NIST). [paper] [bib]
Matthias Hagen and Benno Stein. Candidate Document Retrieval for Web-Scale Text Reuse Detection. In 18th International Symposium on String Processing and Information Retrieval (SPIRE 11) volume 7024 of Lecture Notes in Computer Science, pages 356-367, Berlin Heidelberg New York, October 2011. Springer. [doi] [paper] [bib] [slides]
Matthias Hagen, Benno Stein, and Tino Rüb. Query Session Detection as a Cascade. In Bettina Berendt et al, editors, 20th ACM International Conference on Information and Knowledge Management (CIKM 11), pages 147-152, October 2011. ACM. ISBN 978-1-4503-0717-8. [doi] [paper] [bib] [slides]
Matthias Hagen and Benno Stein. Applying the User-over-Ranking Hypothesis to Query Formulation. In Advances in Information Retrieval Theory. 3rd International Conference on the Theory of Information Retrieval (ICTIR 11) volume 6931 of Lecture Notes in Computer Science, pages 225-237, Berlin Heidelberg New York, September 2011. Springer. [doi] [paper] [bib] [slides]
Benno Stein and Matthias Hagen. Introducing the User-over-Ranking Hypothesis. In Advances in Information Retrieval. 33rd European Conference on IR Research (ECIR 11) volume 6611 of Lecture Notes in Computer Science, pages 503-509, Berlin Heidelberg New York, April 2011. Springer. [doi] [paper] [bib] [slides]
Matthias Hagen, Benno Stein, and Tino Rüb. Query Session Detection as a Cascade. In Ben Carterette, Paul D. Clough, Evangelos Kanoulas, and Mark Sanderson, editors, ECIR 11 Workshop on Information Retrieval over Query Sessions (SIR 11), April 2011. [publisher] [paper] [bib] [slides]
Matthias Hagen, Martin Potthast, Benno Stein, and Christof Bräutigam. Query Segmentation Revisited. In Sadagopan Srinivasan et al, editors, 20th International Conference on World Wide Web (WWW 11), pages 97-106, March 2011. ACM. [doi] [paper] [bib] [slides]
Andre Schmidt, Matthias Hagen, Eileen Schütze, Astrid Schmidt, and Erika Kothe. In silico prediction of potential metallothioneins and metallohistins in actinobacteria. Journal of Basic Microbiology, 50 (6) : 562-569, 2010. [bib]
Matthias Hagen, Benno Stein, and Michael Völske. Webis at the TREC 2010 Sessions Track. In Ellen M. Voorhees and Lori P. Buckland, editors, 19th International Text Retrieval Conference (TREC 10), November 2010. National Institute of Standards and Technology (NIST). [paper] [bib]
Matthias Hagen and Benno Stein. Search Strategies for Keyword-based Queries. In A Min Tjoa and Roland Wagner, editors, 7th International Workshop on Text-Based Information Retrieval (TIR 10) at DEXA, pages 37-41, September 2010. IEEE. ISBN 978-0-7695-4174-7. [doi] [paper] [bib]
Matthias Hagen and Benno Stein. Capacity-Constrained Query Formulation. In Mounia Lalmas et al, editors, Research and Advanced Technology for Digital Libraries. 14th European Conference on Digital Libraries (ECDL 10) volume 6273 of Lecture Notes in Computer Science, pages 384-388, Berlin Heidelberg New York, September 2010. Springer. ISBN 978-3-642-15463-8. [doi] [paper] [bib]
Benno Stein and Matthias Hagen. Making the Most of a Web Search Session. In IEEE/WIC/ACM International Conference on Web Intelligence and Intelligent Agent Technology (WI-IAT 10), pages 90-97, Los Alamitos, California, August 2010. IEEE. ISBN 978-0-7695-4191-4. [doi] [paper] [bib]
Matthias Hagen, Martin Potthast, Benno Stein, and Christof Bräutigam. The Power of Naïve Query Segmentation. In Fabio Crestani et al, editors, 33rd International ACM Conference on Research and Development in Information Retrieval (SIGIR 10), pages 797-798, July 2010. ACM. ISBN 978-1-4503-0153-4. [doi] [paper] [bib] [poster]
Eric Berberich, Matthias Hagen, Benjamin Hiller, and Hannes Moser. Experiments. In Matthias Müller-Hannemann and Stefan Schirra, editors, Algorithm Engineering: Bridging the Gap between Algorithm Theory and Practice [outcome of a Dagstuhl Seminar] volume 5971 of Lecture Notes in Computer Science, pages 325-388, 2010. Springer. ISBN 978-3-642-14865-1. [doi] [bib]
Matthias Hagen. Lower bounds for three algorithms for transversal hypergraph generation. Discrete Applied Mathematics, 157 (7) : 1460-1469, 2009. [article] [bib]
Matthias Hagen, Peter Horatschek, and Martin Mundhenk. Experimental comparison of the two Fredman-Khachiyan-algorithms. In Irene Finocchi and John Hershberger, editors, Proceedings of the Workshop on Algorithm Engineering and Experiments, ALENEX 2009, New York, New York, USA, January 3, 2009, pages 154-161, 2009. SIAM. [paper] [bib]
Matthias Hagen. Algorithmic and Computational Complexity Issues of MONET. Dissertation, Institut für Informatik, Friedrich-Schiller-Universität Jena, December 2008. [paper] [bib]
Judy Goldsmith, Matthias Hagen, and Martin Mundhenk. Complexity of DNF minimization and isomorphism testing for monotone formulas. Information and Computation, 206 (6) : 760-775, 2008. [article] [bib]
Khaled M. Elbassioni, Matthias Hagen, and Imran Rauf. Some Fixed-Parameter Tractable Classes of Hypergraph Duality and Related Problems. In Martin Grohe and Rolf Niedermeier, editors, Parameterized and Exact Computation, Third International Workshop, IWPEC 2008, Victoria, Canada, May 14-16, 2008. Proceedings volume 5018 of Lecture Notes in Computer Science, pages 91-102, 2008. Springer. ISBN 978-3-540-79722-7. [paper] [bib]
Matthias Hagen. On the fixed-parameter tractability of the equivalence test of monotone normal forms. Information Processing Letters, 103 (4) : 163-167, 2007. [article] [bib]
Matthias Hagen. Lower Bounds for Three Algorithms for the Transversal Hypergraph Generation. In Andreas Brandstädt, Dieter Kratsch, and Haiko Müller, editors, Graph-Theoretic Concepts in Computer Science, 33rd International Workshop, WG 2007, Dornburg, Germany, June 21-23, 2007. Revised Papers volume 4769 of Lecture Notes in Computer Science, pages 316-327, 2007. Springer. ISBN 978-3-540-74838-0. [paper] [bib]
Matthias Hagen. Logarithmic Space Instances of Monotone Normal Form Equivalence Testing. (Reports on Computer Science 06-10), Institut für Informatik, Friedrich-Schiller-Universität Jena, June 2006. [paper] [bib]
Judy Goldsmith, Matthias Hagen, and Martin Mundhenk. Complexity of DNF and Isomorphism of Monotone Formulas. In Joanna Jedrzejowicz and Andrzej Szepietowski, editors, Mathematical Foundations of Computer Science 2005, 30th International Symposium, MFCS 2005, Gdansk, Poland, August 29 - September 2, 2005, Proceedings volume 3618 of Lecture Notes in Computer Science, pages 410-421, 2005. Springer. ISBN 3-540-28702-7. [paper] [bib]