Publications, Talks, Demos and Grants

Policy documents:

Journals, Books and Book Chapters:

  1. Hasani-Mavriqi, Kowald, D., Helic, D., Lex, E. Consensus Dynamics in Online Collaboration Systems. Accepted for publication in Computational Social Networks, Springer. 2018
  2. Peters, I., Kraker, P., Lex, E., Gumpenberger, C., Gorraiz, J. Zenodo in the spotlight of traditional and new metrics. Accepted for publication in Frontiers in Research Metrics & Analytics, 2018
  3. Seitlinger, P. Ley, T., Kowald, D., Theiler, D., Hasani-Mavriqi, I., Dennerlein, S., Lex, E., Albert, D. (2017) Balancing the fluency-consistency tradeoff in collaborative information search with a recommender approach. Accepted for publication in International Journal of Human–Computer Interaction.
  4. Kopeinik, S., Kowald, D., Hasani-Mavriqi, I., Lex, E. (2017) Improving Collaborative Filtering Using a Cognitive Model of Human Category Learning. In The Journal of Web Science, 2(4), 45-61 paper
  5. Hasani-Mavriqi, I., Geigl, F., Pujari, S.C., Lex, E., Helic, D. (2016) The influence of social status and network structure on consensus building in collaboration networks. In Social Network Analysis and Mining (SNAM). doi:10.1007/s13278-016-0389-y
  6. Peters, I., Kraker, P., Lex, E., Gumpenberger, C., and Gorraiz, J. (2016) Research data explored: an extended analysis of citations and alt metrics. Scientometrics, 2016. Pages. 1–22
  7. Santos, P., Dennerlein, S., Theiler, D., Cook, J., Treasure-Jones, T., Holley, D., Kerr, M., Attwell, G., Kowald, D. and Lex, E. (2016) Going beyond your personal learning network, using recommendations and trust through a multimedia question-answering service for decision-support: A case study in the healthcare. Journal of Universal Computer Science, Vol. 22, No. 3, pp. 340-359.
  8. Seifert, C., Sabol, V., Kienreich, W., Lex, E., and Granitzer. M., (2014) Visual Analysis and Knowledge Discovery for Text, Large-Scale Data Analytics, Springer, 2014. (pdf)
  9. Lex, E., (2011) Content Facets for Individual Information Needs in Media, PhD thesis, 2011.
  10. Lex, E., Seifert, C., Granitzer, M., Juffinger, A., (2010) Efficient Cross-Domain Classification of Weblogs, International Journal of Intelligent Computing Research (IJICR), Vol.1, Issue 2, 2010.
  11. Lex, E., Seifert, C., Kienreich, W., Granitzer, M., (2008) A generic framework for visualizing the news article domain and its application to real-world data, Journal of Digital Information Management, 2008.

Conference Proceedings:

  1. Lacic, E., Kowald, D., Reiter-Haas, M., Slawicek, V., Lex, E. Beyond Accuracy Optimization: On the Value of Item Embeddings for Student Job Recommendations. Accepted for publication at the Workshop on Multi-dimensional Information Fusion for User Modeling and Personalization (IFUP), co-located with WSDM 2018.
  2. D’Aquin, M., Adamou, A., Dietze, S., Fetahu, B., Gadiraju, U., Hasani-Mavriqi, I., Holtz, P., Kimmerle, J., Kowald, D., Lex, E., Lopez.Sola, S., Maturana, R., Sabol, V., Troullinou, P., & Veas, E. (2017). AFEL: Towards Measuring Online Activities Contributions to Self-directed Learning. In Proceedings of Proceedings of the 7th Workshop on Awareness and Reflection in Technology Enhanced Learning (ARTEL) in conjunction with the 12th European Conference on Technology Enhanced Learning: Adaptive and Adaptable Learning (EC-TEL 2017)
  3. Lacic, E., Kowald, D., & Lex, E. (2017). Tailoring Recommendations for a Multi-Domain Environment. In Proceedings of the 1st Workshop on Intelligent Recommender Systems by Knowledge Transfer & Learning, co-located with ACM Conference on Recommender Systems (RecSys 2017), 42-45
  4. Kowald, D., Kopeinik, S., & Lex, E. (2017). The TagRec Framework as a Toolkit for the Development of Tag-Based Recommender Systems. In Proceedings of the Adjunct Publication of the 25th ACM International Conference on User Modeling, Adapation and Personalization (UMAP’2017). ACM.
  5. Kowald, D., Pujari, S., Lex, E. (2017) Temporal Effects on Hashtag Reuse in Twitter: A Cognitive-Inspired Hashtag Recommendation Approach. In Proceedings of the 26th International World Wide Web Conference (WWW’2017). ACM.
  6. Kopeinik, S., Lex, E., Seitlinger, P., Albert, D., Ley, T. (2017). Supporting collaborative learning with tag recommendations: a real-world study in an inquiry-based classroom project. In Proceedings of the 7th International Conference on Learning Analytics and Knowledge (LAK 2017)
  7. Stanisavljevic, D., Hasani-Mavriqi, I., Lex, E., Strohmaier, M., Helic, D. (2016). Semantic Stability in Wikipedia. In 5th International Workshop on Complex Networks and their Applications.
  8. Traub, M., Lacic, E., Kowald, D., Kahr, M., Lex, E. (2016)  Need Help? Recommending Social Care Institutions. In 1st Workshop on Recommender Systems and Big Data Analysis (RS-BDA), co-located with i-Know 2016.
  9. Kopeinik, S., Kowald, D., Lex, E. Which algorithms Suit Which Learning Environments? A Comparative Study of Recommender Systems in TEL. In Proceedings of the European Conference on Technology Enhanced Learning (EC-TEL 2016).
  10. Dennerlein, S., Seitlinger, P., Lex, E., Ley, T. Take up my Tags: Exploring Benefits of Collaborative Learning in a Social Tagging Field Study at the Workplace. In Proceedings of the European Conference on Technology Enhanced Learning (EC-TEL 2016).
  11. Kowald, D., Lex, E. The Influence of Frequency, Recency and Semantic Context on the Reuse of Tags in Social Tagging Systems. In Proceedings of the 27th ACM Conference on Hypertext and Hypermedia (HT2016)
  12. Lacic, E., Kowald, D., Lex, E. High Enough? Explaining and Predicting Traveler Satisfaction Using Airline Reviews. In Proceedings of the 27th ACM Conference on Hypertext and Hypermedia (HT2016)
  13. Luzhnica, G., Simon, J., Lex, E., Pammer, V. (2016) A Sliding Window Approach to Natural Hand Gesture Recognition using a Custom Data Glove. In Proceedings of the IEEE 3DUI 2016 Symposium on 3D User Interfaces.
  14. Malarkodi C.S., Lex, E. and Sobha Lalitha Devi S. (2016) Named Entity Recognition for the Agricultural Domain. In Proceedings of the 17th International Conference on Intelligent Text Processing and Computational Linguistics (CICLING 2016)
  15. Ruiz-Calleja, A., Dennerlein, S., Ley, T., Lex, E. (2016) Visualizing workplace learning data with the SSS Dashboard. In Learning Analytics for Workplace and Professional Learning (LA for Work) workshop at LAK 2016.
  16. Kowald, D., Seitlinger, P., Ley, T., Lex, E. (2015) Modeling Activation Processes in Human Memory to Improve Tag Recommendations. Poster and Presentation at Computational Social Science Winter Symposium (CSSWS), 2015.
  17. Kowald, D. and Lex, E. (2015) Evaluating Tag Recommender Algorithms in Real-World Folksonomies: A Comparative Study. In Proceedings of the 9th ACM Recommender Systems Conference (RecSys 2015) paper
  18. Lacic, E., Kowald, D., Traub, M. and Lex, E. (2015) Tackling Cold-Start Users in Recommender Systems with Indoor Positioning Systems In Proceedings of the 9th ACM Recommender Systems Conference (RecSys 2015)
  19. Lacic, E., Traub, M., Kowald, D. and Lex, E. (2015) ScaR: Towards a Real-Time Recommender Framework Following the Microservices Architecture In Workshop on Large Scale Recommender Systems (LSRS2015) at RecSys 2015
  20. Pujari, S., Hadgu, A., Lex, E., Jäschke, R. (2015) Social Activity versus Academic Activity: A Case Study of Computer Scientists on Twitter In Proceedings of the 15th International Conference on Knowledge Technologies and Data-Driven Business (i-KNOW 2015)
  21. Dennerlein, S., Kowald, D., Lex, E., Theiler, D., Lacic, E., Ley, T., Tomberg V., Ruiz-Calleja, A. (2015) The Social Semantic Server: A Flexible Framework to Support Informal Learning at the Workplace In Proceedings of the 15th International Conference on Knowledge Technologies and Data-Driven Business (i-KNOW 2015)
  22. Traub, M., Kowald, D., Lacic, E., Schoen, P., Supp, G., Lex, E. (2015) Smart Booking Without Looking: Providing Hotel Recommendations in the TripRebel Portal.  In Proceedings of the 15th International Conference on Knowledge Technologies and Data-Driven Business (i-KNOW 2015)
  23. Ruiz-Calleja, A., Dennerlein, S. M., Tomberg, V., Ley, T., Theiler, D., Lex, E. (2015). Integrating data across workplace learning applications with a social semantic infrastructure. In Proceedings of the International Conference on Web-based Learning.
  24. Hasani-Mavriqi, I., Geigl, F., Pujari, S., Lex, E., Helic, D. (2015) Influence of Status on Consensus Building in Collaboration Networks. In Proceedings of the IEEE/ACM International Conference on Advances in Social Networks Analysis and Mining (ASONAM 2015)
  25. Kraker, P., Lex, E. (2015) A Critical Look at the ResearchGate Score as a Measure of Scientific Reputation.  Quantifying and Analysing Scholarly Communication on the Web (ASCW’15 at ACM Web Science)
  26. Lex, E., Dennerlein, S. (2015) HowTo: Scientific Work in Interdisciplinary and Distributed Teams In: Science 2.0, IEEE Computer Society Special Technical Community on Social Networking E-Letter, vol. 3, no. 1, June 2015.
  27. Kraker, P., Lex, E., Gorraiz, J., Gumpenberger, C., Peters, I. (2015) Research Data Explored II: the Anatomy and Reception of figshare In Proceedings of the 20th International Conference on Science and Technology Indicators (STI 2015)
  28. Cook, J., Ley, T., Maier, R., Mor, Y., Santos, P., Lex, E., Dennerlein, S., Trattner, C., Holley, D. (2015) Using the Hybrid Social Learning Network to Explore Concepts, Practices, Designs and Smart Services for Networked Professional Learning In Proceedings of the International Conference on Smart Learning Environments 2015 (ICSLE 2015)
  29. Ruiz-Calleja, A., Dennerlein, S., Tomberg, V., Pata, K., Ley, T., Theiler, D. & Lex, E. (2015). Supporting learning analytics for informal workplace learning with a social semantic infrastructure. In Proceedings of the European Conference on Technology Enhanced Learning, Springer International Publishing (in press).
  30. Dennerlein, S., Theiler, D., Marton, P., Santos Rodriguez, P., Cook, J., Lindstaedt, S. & Lex, E. (2015). KnowBrain: An Online Social Knowledge Repository for Informal Workplace Learning. In Proceedings of the European Conference on Technology Enhanced Learning, Springer International Publishing (in press).
  31. Seitlinger, P., Kowald, D., Kopeinik, S., Hasani-Mavriqi, I., Ley, T., and Lex, E. (2015) Attention Please! A Hybrid Resource Recommender Mimicking Attention-Interpretation Dynamics. In 24rd International World Wide Web Conference (WWW2015), Web-Science Track, Companion Volume, New York: ACM. paper
  32. Peters, I., Kraker, P., Lex, E., Gumpenberger, C., and Gorraiz, J. (2015) Research Data Explored: Citations versus Altmetrics. In Proceedings of the International Society for Informetrics and Scientometrics – ISSI 2015, 2015
  33. Kraker, P., Enkhbayar, A., Lex, E. (2015) Exploring Coverage and Distribution of Identifiers on the Scholarly Web. In Proceedings of the 14th International Symposium of Information Science – ISI 2015, 2015
  34. Lex, E., Kraker, P., Dennerlein, S. (2014) What Really Works: Reflections on Applied Methods in a Real World Interdisciplinary Project , Interdisciplinary Coups to Calamities Workshop at ACM Web Science 2014, Bloomington, Indiana, USA.
  35. Wozelka, R., Sabol, V., Lex, E. (2014) Graph Visualization using Hierarchical Aggregation and Edge Bundling , Poster at ACM Web Science 2014, Bloomington, Indiana, USA.
  36. Horn, C., Zhila, A., Gelbukh, A., Kern, R., & Lex, E. (2013) Using Factual Density to Measure Informativeness of Web Documents, Proceedings of the Nordic Conference on Computational Linguistics (NoDaLiDA) 2013.
  37. Kienreich, W.; Schulze, G.; Lex, E.; Rapp, S. (2013) Eine Kombination von Regelbasierten und Statistischen Verfahren für die Hierarchische Klassifikation von Juristischen Dokumenten, Internationales Rechtsinformatik-Symposion 2013.
  38. Lex, E.; Pimas, O.; Simon, J. & Pammer, V. (2012) Where am I? Using Mobile Sensor Data to Predict a User’s Semantic Place with a Random Forest Algorithm, Proceedings of 9th International Conference on Mobile and Ubiquitous Systems: Computing Networking and Services (Mobiquitous 2012), 2012.
  39. Lex, E., Voelske, M., Errecalde, M., Ferretti, E., Cagnina, L., Horn, C., Stein, B., and Granitzer, M. (2012) Measuring the Quality of Web Content using Factual Information, Proceedings of the 2nd Joint WICOW/AIRWeb Workshop on Web Quality at WWW 2012.
  40. Rapp, S., Kienreich, W., Lex, E. (2012) Maschinelle Lernverfahren für die Automatische Klassifikation von Juristischen Dokumenten,Tagungsband IRIS 2012 – 15. Internationale Rechtsinformatik Symposion.
  41. Horn, C., Lex, E., Granitzer, M. (2011) Who Tweets: Detecting User Types and Tweet Quality using Supervised Classification,IADIS European Conference on Data Mining (ECDM) 2011.
  42. Horn, C., Pimas, O., Granitzer, M., and Lex, E. (2011) Realtime Ad Hoc Search in Twitter: Know-Center at TREC Microblog Track 2011., TREC 2011 Notebook Paper.
  43. Lex, E., Khan, I., Bischof, H., Granitzer, M. (2010) Assessing the Quality of Web Content., Proceedings of the ECML/PKDD Discovery Challenge 2010, Online.
  44. Granitzer, M., Kienreich, W., Sabol, V., Lex, E. (2010) Knowledge Relationship Discovery and Visually Enhanced Access for the Media Domain., Medien-Wissen-Bildung. Explorationen visualisierter und kollaborativer Wissensräume (Conference Series).
  45. Lex, E., Juffinger, A., Granitzer, M. (2010) A Comparison of Stylometric and Lexical Features for Web Genre Classification and Emotion Classification in Blogs., IEEE Computer Society: 7th International Workshop on Text-based Information Retrieval in Procceedings of 21th International Conference on Database and Expert Systems Applications (DEXA 10).
  46. Lex, E., Juffinger, A., Granitzer, M. (2010) Objectivity Classification in Online Media., Proceedings of the 21st ACM SIGWEB Conference on Hypertext and Hypermedia (HT2010), 2010.
  47. Lex, E., Granitzer, M., Muhr, M., Juffinger, A. (2010) Stylometric Features for Emotion Level Classification in News Related Blogs., Proceedings of the 9th ACM RIAO Conference, 2010.
  48. Juffinger, A., Lex, E., Freire, N. (2010) Error Tolerant Large Scale FRBRization., In Proceedings of the Third Workshop on Very Large Digital Libraries (ECDL 2010), 2010.
  49. Lex, E., Granitzer, M., Juffinger, A. (2009) Facet Classification of Blogs: Know-Center at the TREC 2009 Blog Distillation Task., Proceedings of the 18th Text Retrieval Conference, 2009.
  50. Lex, E., Content Based Quality And Credibility Assessment For Blogs. (2009) , Doctoral Paper at IADIS International Conference WWW/Internet, 2009.
  51. Lex, E., Granitzer, M., and Juffinger, A. (2009) Know-Center at TREC 2009 Blog Distillation Task: A Notebook Paper., Notebook paper at TREC 2009 conference.
  52. Juffinger, A., Willfort, R., Lex E., Granitzer, M. (2009) Spectral Web Content Trend Analysis., Proceedings of the IADIS International Conference WWW/Internet, 2009.
  53. Lex, E., Seifert, C., Granitzer, M., Juffinger, A. (2009) Automated Blog Classification: A Cross Domain Approach., Proceedings of the IADIS International Conference WWW/Internet, 2009.
  54. Lex, E., Seifert, C., Granitzer, M., Juffinger, A. (2009) Cross-Domain Classification: Trade- Off between Complexity and Accuracy., Proceedings of the 4th International Conference for Internet Technology and Secured Transactions (ICITST), 2009.
  55. Seifert, C., Lex, E. (2009)A Novel Visualization Approach for Data-Mining-Related Classification., Proceedings of the 13th International Conference on Information Visualization (IV09), IEEE Computer Society, 2009.
  56. Seifert, C., Lex, E. (2009) A Visualization to Investigate and Give Feedback to Classifiers., Poster and Demo at the EuroVis 2009.
  57. Juffinger, A., Lex, E. (2009) Crosslanguage Blog Mining and Trend Visualization., Proceedings of the 18th World Wide Web Conference (WWW’2009).
  58. Juffinger, A., Granitzer, M., Lex, E. (2009) Blog Credibility Ranking by Exploiting Verified Content., Proceedings of the 3rd Workshop on Information Credibility on the Web at the 18th WWW conference.
  59. Kienreich, W., Lex, E., Seifert, C. (2008) APA Labs: An Experimental Web-Based Platform for the Retrieval and Analysis of News Articles., Proceedings of the first International Conference on the Applications and Digital Information and Web Technologies (ICADIWT08).
  60. Lex, E.; Kienreich, W.; Granitzer, M. (2007) A General Purpose Visual Formalism Based on Procedurally Generated Geometry., Proceedings of the 2nd International Symposium on Generalization of Information 2007.

Selected Invited Talks:

  • The impact of user and network properties on opinion dynamics in online collaboration networks. Invited talk at the workshop Social Informatics: En Route Towards Asimov’s Psychohistory? Complexity Hub, Vienna, 2018
  • Understanding, predicting and controlling social behaviour in complex networks and systems. Invited talk at Karlsruhe Institute of Technology, Institute AIFB, 2018
  • Cognitive-inspired Recommender Systems. Invited talk in the GESIS CSS seminar, 2017
  • Social Computing and Recommender Systems. Invited presentation at ACIS at RWTH, 2017
  • Data-driven Innovation in Research and Education. Keynote at Didacta 2016.
  • Research Data Explored: Citations versus Altmetrics. Invited talk at Austrian Librarian Days 2015.
  • Altmetrics and Scholarly Communication. Session together with Peter Kraker at Barcamp Science 2.0 2015.
  • Science 2.0 and Big Data. Invited talk at ABDOS Tagung 2015.
  • Information Quality in Social Media (2011). Invited talk at Faculty of Computer Science, UNSL Argentina.



  • 2016: OpenUP (OPENing UP new methods, indicators and tools for peer review, dissemination of research results, and impact measurement), H2020 GARRI (CSA), EUR 2.3 Mio total, ~283k funding acquired for the own institution together with Peter Kraker from Know-Center
  • 2015: AFEL (Analytics for Everyday Learning), H2020 ICT 20, EUR 2.6 Mio total, ~610k  funding acquired for the own institution together with Vedran Sabol and Nina Simon from Know-Center
  • 2014: MoreGrasp (Restoration of upper limb function in individuals with high spinal cord injury by multimodal neuroprostheses for interaction in daily activities), H2020 ICT 22, EUR 3.5 Mio total, ~560k  funding acquired for the own institution together with Hermann Stern from Know-Center
  • 2014: FFG – K1 Research Center Grant (COMET center Know-Center), FFG, 20 Mio total for 8 years, in collaboration with the Know-Center management team in my role as then deputy area manager of the Social Computing area
  • 2014: QnHT 2.0 (HTS FFG Qualifizierungsnetzwerk), FFG, EUR 460.000 total