Prof. Dr. Christian Wartena

Expo Plaza 12
30539 Hannover
Raum: 2E.4.24
Tel: +49 511 9296 2594
E-Mail: christian.wartena@hs-hannover.de

Lehrgebiete
– Sprach- und Wissensverarbeitung

Arbeitsgebiete
– Lexikalische Semantik

Aktivitäten und Gremien
• Studiengangskoordinator Informationsmanagement
• Mitglied im Fakultätsrat (2013-2017)
• Mitglied in der Studienkommission der Abteilung IK (seit 2015)
• Vorsitzender der Berufungskommisssion K160 (Informationretrieval und Digitale Bibliothek)

Veröffentlichungen
Josi, Frieda, and Christian Wartena. “Structural Analysis of Contract Renewals.” In Proceedings of the CIKM 2018 Workshops, Vol. 2482. Torino: CEUR-WS, 2019. http://ceur-ws.org/Vol-2482/paper31.pdf. Cite
Wartena, Christian. “A Probabilistic Morphology Model for German Lemmatization.” Erlangen, 2019. Cite
Wartena, Christian, Uwe Sander, and Christiane Patzelt. “Sentiment Independent Topic Detection in Rated Hospital Reviews.” In Proceedings of the 13th International Conference on Computational Semantics - Short Papers, 59–64, 2019. https://aclweb.org/anthology/papers/W/W19/W19-0509/. Cite
Josi, Frieda, Christian Wartena, and Ulrich Heid. “Detecting Paraphrases of Standard Clause Titles in Insurance Contracts.” In RELATIONS - Workshop on Meaning Relations between Phrases and Sentences. Gothenburg, Sweden: Association for Computational Linguistics, 2019. https://www.aclweb.org/anthology/W19-0803. Cite
Charbonnier, Jean, and Christian Wartena. “Predicting Word Concreteness and Imagery.” In Proceedings of the 13th International Conference on Computational Semantics - Long Papers, 176–187. Gothenburg, Sweden: Association for Computational Linguistics, 2019. https://www.aclweb.org/anthology/W19-0415. Cite
Franke-Meyer, Michael, and Christian Wartena. “Knowledge Organization for Digital Humanities.” In Knowledge Organization for Digital Humanities -  Proceedings of the 15th Conference on Knowledge Organization (WissOrg’17). Berlin: FU Berlin, 2018. https://refubium.fu-berlin.de/handle/fub188/20535. Cite
Josi, Frieda, Christian Wartena, and Jean Charbonnier. “Text-Based Annotation of Scientific Images Using Wikimedia Categories.” In Database and Expert Systems Applications, edited by Mourad Elloumi, Michael Granitzer, Abdelkader Hameurlain, Christin Seifert, Benno Stein, A Min Tjoa, and Roland Wagner, 243–253. Cham: Springer International Publishing, 2018. Cite
Sohmen, Lucia, Jean Charbonnier, Ina Blümel, Christian Wartena, and Lambert Heller. “Figures in Scientific Open Access Publications.” In Digital Libraries for Open Knowledge, edited by Eva Méndez, Fabio Crestani, Cristina Ribeiro, Gabriel David, and João Correia Lopes, 220–226. Cham: Springer International Publishing, 2018. Cite
Charbonnier, Jean, and Christian Wartena. “Using Word Embeddings for Unsupervised Acronym Disambiguation.” In Proceedings of the 27th International Conference on Computational Linguistics, 2610–2619. Santa Fe, New Mexico, USA: Association for Computational Linguistics, 2018. http://aclweb.org/anthology/C18-1221. Cite
Laser, Hans, Felix Struckmann, Svetlana Gerbel, Iyas Hamwi, Michael Heuser, and Christian Wartena. “Development of a Web-Based Platform for Information Extraction and Full-Text Mining of Medical Findings of Acute Myeloid Leukemia (AML).” In GMDS. Osnabrück, 2018. https://doi.org/https://dx.doi.org/10.3205/18gmds159. Cite
Laser, Hans, Felix Struckmann, Yannik Wissner, Norman Schönfeld, Svetlana Gerbel, and Christian Wartena. “(Semi) Automatic Annotation and Anonymization of Medical Text Documents for Secondary Use.” Osnabrück, 2018. https://doi.org/https://dx.doi.org/10.3205/18gmds127. Cite
Charbonnier, Jean, Lucia Sohmen, John Rothman, Birte Rohden, and Christian Wartena. “NOA: A Search Engine for Reusable Scientific Images Beyond the Life Sciences.” In Advances in Information Retrieval, edited by Gabriella Pasi, Benjamin Piwowarski, Leif Azzopardi, and Allan Hanbury, 797–800. Springer International Publishing, 2018. Cite
Wartena, Christian, and Hans Peter Ederberg. “Clustering of German Place Names.” Debrecen, 2018. Cite
Aga, Rosa Tsegaye, Christian Wartena, Otto Lange, and Nelleke Aders. “Automatic Identification of Synonym Relations in the Dutch Parliament’s Thesaurus.” Archives of Data Science, Series A., 2017. Cite
Wartena, Christian, and Michael Franke-Maier. “Automatic Assignment of LCSH.” In European Conference on Data Analysis, 2017. Cite
Lüschow, Andreas, and Christian Wartena. “Classifying Medical Literature Using K-Nearest-Neighbours Algorithm.” In Networked Knowledge Organization Systems Workshop (NKOS 2017), 2017. Cite
Wartena, Christian, and Hans Peter Ederberg. “Clustering von deutschen Ortsnamen (Clustering of German Place Names).” In XXVI Internatiinal Conference of Onomastic Sciences. Debrecen, 2017. Cite
Babik, Wieslaw, Peter Ohly, Christian Wartena, and Karsten Weber. “Theorie, Semantik und Organisation von Wissen. Einige Vorbemerkungen.” In Theorie, Semantik und Organisation von Wissen. Würzburg: Ergon, 2017. Cite
Blümel, Ina, Simone Cartellieri, Lambert Heller, and Christian Wartena. “Discovery and Efficient Reuse of Technology Pictures Using Wikimedia Infrastructures.” In International Science 2.0 Conference, 2016. Cite
Aga, Rosa Tsegaye, and Christian Wartena. “CogALex-V Shared Task: HsH-Supervised–Supervised Similarity Learning Using Entry Wise Product of Context Vectors.” COLING 2016, 2016, 114. Cite
Aga, Rosa Tsegaye, Christian Wartena, Lucas Drumond, and Lars Schmidt-Thieme. “Learning Thesaurus Relations from Distributional Features.” In Tenth International Conference on Language Resources and Evaluation (LREC 2016), 2016. Cite
Aga, Rosa Tsegaye, Lucas Drumond, Christian Wartena, and Lars Schmidt-Thieme. “Integrating Distributional and Lexical Information for Semantic Classification of Words Using MRMF.” In COLING 2016, the 26th International Conference on Computational Linguistics, 2708–2717, 2016. Cite
Mayr, Philipp, Douglas Tudhope, Koraljka Golub, Christian Wartena, and De Luca, Ernesto William. “Editorial for the 15th European Networked Knowledge Organization Systems Workshop (NKOS 2016).” In Networked Knowledge Organization Systems Workshop (NKOS 2016), 1–6, 2016. Cite
Aga, Rosa Tsegaye, Christian Wartena, and Michael Franke-Maier. “Automatic Recognition and Disambiguation of Library of Congress Subject Headings.” In Research and Advanced Technology for Digital Libraries: 20th International Conference on Theory and Practice of Digital Libraries, TPDL 2016, Hannover, Germany, September 5–9, 2016, Proceedings, edited by Norbert Fuhr, László Kovács, Thomas Risse, and Wolfgang Nejdl, 442–446. Springer International Publishing, 2016. Cite
Garcia-Alsina, Montserrat, Christian Wartena, and Sönke Lieberam-Schmidt. “Challenges to Construct Regional Knowledge Maps for Territories’ Sustainable Development.” In Knowledge Discovery, Knowledge Engineering and Knowledge Management, edited by Ana Fred, Jan L.G. Dietz, Kecheng Liu, and Joaquim Filipe, 454:387–399. Communications in Computer and Information Science. Springer Berlin Heidelberg, 2015. https://doi.org/10.1007/978-3-662-46549-3‗. Cite
Wartena, Christian. “Semantische Textanalyse in Der Medizin: Grundlagen Und State of the Art.” Forum Der Medizin_Dokumentation Und Medizin_Informatik 17, no. 2 (2015): 56–60. Cite
Wartena, Christian, and Montserrat Garcia-Alsina. “Keyword Extraction from Company Websites for the Development of Regional Knowledge Maps.” In Knowledge Discovery, Knowledge Engineering and Knowledge Management, edited by Ana Fred, Jan L.G. Dietz, Kecheng Liu, and Joaquim Filipe, 454:96–111. Communications in Computer and Information Science. Springer Berlin Heidelberg, 2015. https://doi.org/10.1007/978-3-662-46549-3‗. Cite
Wartena, Christian. “On the Effect of Word Frequency on Distributional Similarity.” In Proceedings of the 12th Edition of the Konvens Conference, Hildesheim, Germany, October 8-10, 2014, edited by Josef Ruppenhofer and Gertrud Faa\s s, 1–10. Universitätsbibliothek Hildesheim, 2014. Cite
Mader, Christian, and Christian Wartena. “Supporting Web Vocabulary Development by Automated Quality Assessment: Results of a Case Study in a Teaching Context.” In 2nd Workshop on Human-Semantic Web Interaction (HSWI’14), 2014. http://hswi.referata.com/w/images/Hswi2014‗ paper‗ 4.pdf. Cite
Wartena, Christian, and Montserrat Garcia-Alsina. Keyword Extraction from Company Websites for the Development of Regional Knowledge Maps. International Conference on Territorial Intelligence: Information and Knowledge Management for the Development of Territories. Barcelona, 2013. Cite
Garcia-Alsina, Montserrat, Christian Wartena, and Sönke Lieberam-Schmidt. “Regional Knowledge Maps: Potentials and Challenges.” In Fifth International Conference on Knowledge Management and Information Sharing (KMIS 2013), 514–519. Portugal, 2013. http://www.scitepress.org/DigitalLibrary/Link.aspx?doi=10.5220/0004627105140519. Cite
Garcia-Alsina, Montserrat, Christian Wartena, and Eva Ortoll. “Methodology to Construct Regional Knowledge Maps to Territory’s Sustainable Development.” In Methodology to Construct Regional Knowledge Maps to Territory’s Sustainable Development. Barcelona, 2013. https://congress.uoc.edu/rdi2013/paper/paper/view/id/323. Cite
Wartena, Christian. “Segmentation Strategies for Passage Retrieval from Internet Video Using Speech Transcripts.” Journal of Digital Information Management 11, no. 6 (2013): 400–408. Cite
Wartena, Christian. “HsH: Estimating Semantic Similarity of Words and Short Phrases with Frequency Normalized Distance Measures.” In Proceedings of the 6th International Workshop on Semantic Evaluation (SemEval 2013), Atlanta, Georgia, USA, 2013. Cite
Wartena, Christian. “Distributional Similarity of Words with Different Frequencies.” In Proceedings of the 13th Dutch-Belgian Workshop on Information Retrieval, 2013. Cite
Wartena, Christian, and Montserrat Garcia Alsina. “Challenges and Potentials for Keyword Extraction from Company Websites for the Development of Regional Knowledge Maps.” In Proceedings of the International Conference on Knowledge Discovery and Information Retrieval and the International Conference on Knowledge Management and Information Sharing (IC3K 2013), 241–48, 2013. https://doi.org/10.5220/0004660002410248. Cite
Wartena, Christian. “Comparing Segmentation Strategies for Efficient Video Passage Retrieval.” In 2012 10th International Workshop on Content-Based Multimedia Indexing (CBMI). Piscataway, NJ: IEEE, 2012. https://doi.org/10.1109/CBMI.2012.6269850. Cite
Eskevich, Maria, Gareth J.F. Jones, Martha Larson, Christian Wartena, Robin Aly, Thijs Verschoor, and Roeland Ordelman. “Comparing Retrieval Effectiveness for Alternative Content Segmentation Methods for Internet Video.” In Proceedings of 10th Workshop on Content-Based Multimedia Indexing (CBMI 2012), 2012. Cite
Wartena, Christian, and Maike Sommer. “Automatic Classification of Scientific Records Using the German Subject Heading Authority File (SWD).” In Proceedings of the 2nd International Workshop on Semantic Digital Archives, 37–48, 2012. Cite
Wartena, Christian, and Rogier Brussee. “Evaluating Tag Similarity Measures by Clustering Bibsonomy Tags.” In The 36th Annual Conference of the German Classification Society on Data Analysis, Machine Learning and Knowledge Discovery, 2012. Cite
Wartena, Christian, and Martin Wibbels. “Improving Tag-Based Recommendation by Topic Diversification.” In Advances in Information Retrieval, 6611:43–54. Springer, 2011. https://doi.org/10.1007/978-3-642-20161-5‗ 7. Cite
Wartena, Christian, Wout Slakhorst, Martin Wibbels, Zeno Gantner, Christoph Freudenthaler, Chris Newell, and Lars Schmidt-Thieme. “Keyword-Based TV Program Recommendation.” In Intelligent Techniques for Web Personalization & Recommender Systems (ITWP’11), 756:15. CEUR-WS, 2011. Cite
Wartena, Christian, and Martha Larson. “Rich Speech Retrieval Using Query Word Filter.” In Working Notes Proceedings of the MediaEval 2011 Workshop, Vol. 897. CEUR-WS, 2011. Cite
Larson, Martha, Mohammad Soleymani, Pavel Serdyukov, Stevan Rudinac, Christian Wartena, Vanessa Murdock, Gerald Friedland, Roeland Ordelman, and Gareth J.F. Jones. “Automatic Tagging and Geotagging in Video Collections.” In ACM International Conference on Multimedia Retrieval (ICMR 2011), 2011. Cite
Wartena, Christian. “Automatic Classification of Social Tags.” In ECDL’10: Proceedings of the 14th European Conference on Research and Advanced Technology for Digital Libraries, 6273:176–183. Lecture Notes in Computer Science. Springer, 2010. http://link.springer.com/chapter/10.1007/978-3-642-15464-5_19. Cite
Wartena, Christian. “Zoeken Met Tags: Tagvarianten Semantisch Getemd.” InformatieProfessional 3 (2010): 20–23. Cite
Wartena, Christian. “Using a Divergence Model for MediaEval’s Tagging Task (Professional Version).” In MediaEval’10 Working Notes, 2010. Cite
Wartena, Christian. “Testing the Distributional Hypothesis for Collaborative Tagging Systems.” In Language and Logos: A Festschrift for Peter Staudacher, edited by Gisbert Fanselow and Thomas Hanneforth, 407–415. Studia Grammatica. Akademie Verlag, 2010. Cite
Wartena, Christian, Rogier Brussee, and Wout Slakhorst. “Keyword Extraction Using Word Co-Occurrence.” In Proceedings, edited by A. Min Tjoa and Roland R. Wagner, 54–58. Los Alamitos, Calif: IEEE Computer Society, 2010. Cite
Gazendam, L., C. Wartena, and R. Brussee. “Thesaurus Based Term Ranking for Keyword Extraction.” In 2010 Workshops on Database and Expert Systems Applications, 49–53, 2010. https://doi.org/10.1109/DEXA.2010.31. Cite
Betreute Abschlussarbeiten
Aga, Rosa Tsegaye. “Similarity Models in Distributional Semantics Using Task Specific Information.” Dissertation, Universität Hildesheim, 2019.
Sawatzki, Isabelle. “Katastrophen- Und Notfallmanagement: Eine Untersuchung an Bibliotheken in Deutschland.” Hochschule Hannover, 2019.
Andresen, Amelie. “Reproduzierbarkeit von Studien in der Computerlinguistik.” 2019.
Wissner, Yannik. “Prozessodellierung zur Sekundärnutzung von Arztbriefen der Medizinischen Hochschule Hannover,” 2018.
Kavalenka, Sviatlana. “Einführung des Asset- und Wissensmanagements-Workflows in einem IT-Kleinunternehmen,” 2018.
Schultz, Catarina. “Ein Chatbot für Bewerber –  Eine Fallstudie bei Madsack-Online,” 2018.
Rohden, Birte. “Konzeption, Entwicklung und Evaluation einer Web-Oberfläche für die wissenschaftliche Bildersuchmaschine NOA,” 2018. https://nbn-resolving.org/urn:nbn:de:bsz:960-opus4-11885.
Josi, Frieda. “Textbasiert Annotation von Abbildungen mit Kategorien von Wikimedia,” 2018. https://nbn-resolving.org/urn:nbn:de:bsz:960-opus4-11949.
Hamacher, Svenja. “Potentialanalyse ausgewählter Daten der Firma Harting für die Nutzung in einem Empfehlungssystem,” 2018.
Dombek, Stefan. “Digital Sprachassistenz für die Recherche im Discovery-System der Universitätsbibliothek Leipzig,” 2018.
Salameh, Amelie. “Artificial Inteligence as a Commons – Opportunities and Challenges for Society,” 2017. http://nbn-resolving.de/urn:nbn:de:bsz:960-opus4-11530.
Marwede, Julian. “Optimierung der Redaktionsprozesse im Zuge des Website Relaunches der Continental AG,” 2016.
Horn, Moritz. “Vergleich von webbasierten Programmschnittstellen zum Zugriff auf kontrollierte Vokabulare,” 2016.
Etnaer, Alexandra. “Vergleich politischer Begriffe in Thesauri,” 2016.
Schmidt, Julian. “Big Data und Business Intelligence,” 2015.
Frerichs, Sven. “Konzeptionierung und Entwicklung einer Software zur Visualisierung von dynamischen Touren in der Inhouse-Logistik der Volkswagen AG,” 2015.
Demir, Cansu. “Manipulation von Online-Bewertungen: Aufdeckung und rechtliche Konsequenzen von falschen Rezensionen im Web,” 2015.
Nienaber, Laura. “Die Rolle der Personalisierung im Versandhandel in Deutschland,” 2014.
Koch, Christian. “Strukturierung Informeller Geschäftsprozesskommunikation,” 2014.
Klein, Marina. “Konzipierung der Onpage SEO-Funktionen einer E-Commerce Plattform,” 2014.
Faller, Oxana. “Klassifikation von Unternehmen mit der Nutzung der Patentdatenbanken,” 2013.
Sommer, Maike. “Automatische Generierung von DDC Notationen für Hochschulveröffentlichungen,” 2012. http://nbn-resolving.de/urn:nbn:de:bsz:960-opus-3976.
Meier, Fabian. “Der Ist-Zustand von Social Media Monitoring in Deutschland - Eine Untersuchung der Anwendungsmöglichkeiten am praktischen Beispiel einer Twitter-Stimmungsanalyse,” 2012.
Bartoshevska, Maiia. “Erfahrung bei der Einführung von der Scrum-Methode in einem internationalen Unternehmen,” 2017.
Ehring, Philip. “Klassifikation von Google Suchergebnissen – Eine Potentialanalyse zur Verbesserung des Keyword Targeting unter Betrachtung der Suchintention mit Hilfe des Maschinellen Lernens,” 2017.
Horn, Nathalie. “Transparenz in der Softwareentwicklung für Airline Operations bei TUIfly mit Hilfe von JIRA Software,” 2017.
Mußmann, Wolf-Dietrich. “Prototyp einer Spezialsuchmaschine für Massive Open Online Courses,” 2017.
Freytag, Daniel. “Nicht-standardisierte Erweiterungen von SKOS-Thesauri und ihre Auswirkungen auf die Kompatibilität,” 2016. http://nbn-resolving.de/urn:nbn:de:bsz:960-opus4-10035.
Mölck, Letitia. “Möglichkeiten zur Unterstützung der automatischen Spracherkennung in wissenschaftlichen Videos mit Terminologie-Datenbanken,” 2013. http://nbn-resolving.de/urn:nbn:de:bsz:960-opus-4128.
Rauchegger, Evelyn. “Metadaten für das digitale Archiv des Niedersächsischen Landesamts für Denkmalpflege,” 2013. http://nbn-resolving.de/urn:nbn:de:bsz:960-opus-4086.
Reiperstein, Erna. “Kodierung und Erweiterung eines mehrsprachigen politischen Thesaurus,” 2016.
Nyutina, Ksenia. “Informationsbeschaffung in der Pressestelle der Bundesanstalt für Geowissenschaften und Rohstoffe,” 2014.
Danilov, Mihail. “Die nachhaltige Wirkung der Suchmaschinenoptimierung als Teil des Suchmaschinenmarketings im B2B-Bereich,” 2017.
Brielich, Sebastian. “Chancen und Risiken durch den Einsatz von Business Rules am Beispiel eines Versicherungsunternehmens,” 2014.
Rathgeber, Verena. “Broadcast yourself! Künstlerselbstvermarktung im Web 2.0 Am Beispiel der Band The Hirsch Effekt,” 2013.
Lüschow, Andreas. “Automatische Klassifizierung medizinischer Literatur mit Hilfe vorgegebener Klassifikationen,” 2016. http://nbn-resolving.de/urn:nbn:de:bsz:960-opus4-10583.
Bendixen, Niklas. “Automatische Klassifikation von Firmenwebseiten,” 2015.
Harrer, Max. “Automatische Indexierung von Vorlesungsvideos mit Deskriptoren des Standard Thesaurus Wirtschaft,” 2016.
Zhuravleva, Ekatharina. “Akzeptanz und Nutzung des Unternehmenswikis in der kestnergesellschaft,” 2014.
Kanis, Zwier. “Determining and Classifying Semantically Coherent Segments in Web Pages.” Master’s Thesis, Universiteit Twente, 2011.
Gazendam, Luit. “Cataloguer Support in Cultural Heritage.” PhD Thesis, Vrije Universiteit Amsterdam, Niederlande, 2015.