Scientific Publications
2009 Matteo Baldoni, Cristina Baroglio, Ingo Brunkhorst, Nicola Henze, Elisa Marengo, Viviana Patti: Semantic Constraint Modeling for Curriculum Planning and Validation. Accepted for publication, special issue on Technologies for Multimedia-enhanced Learning Environments, Interactive Learning Environments Journal. Fabian Abel, Matteo Baldoni, Cristina Barolgio, Nicola Henze, Daniel Krause, Viviana Patti: Context-based Ranking in Folksonomies. 20th ACM Conference on Hypertext and Hypermedia, June 29 - July 1st, 2009, Torino, Italy. F. Abel, N. Henze, D. Krause, M. Kriesell: Semantic Enhancement of Social Tagging Systems. Devedzic, Vladan and Gasevic, Dragan (Eds.): Annals of Information Systems, Vol. 6, Web 2.0 & Semantic Web. Springer Verlag, ISBN: 978-1-4419-1218-3. Fabian Abel , Nicola Henze , Daniel Krause: Social Semantic Web at Work: Annotating and Grouping Social Media Content Cordeiro, J., Hammoudi, S. and Filipe, J. (Eds.): 4th International Conference, WEBIST 2008, Funchal, Madeira, Portugal, Revised Selected Papers; Series: Lecture Notes in Business Information Processing, Vol. 18, 2009. Fabian Abel , Nicola Henze , Daniel Krause , Matthias Kriesell: On the Effect of Group Structures on Ranking Strategies in Folksonomies King, Irwin and Baeza-Yates, Ricardo (Eds.):Weaving Services and People on the World Wide Web. Springer Verlag. Fabian Abel , Nicola Henze , ArneWolf Koesling , Daniel Krause , Daniel Olmedilla: A User Interface to Define and Adjust Policies for Dynamic User Models. In: WEBIST 2009 - Proceedings of the Fifth International Conference on Web Information Systems and Technologies, Lisbon, Portugal, March 23-26, 2009. Fabian Abel , Nicola Henze , Daniel Krause: Context-aware Ranking Algorithms in Folksonomies. In: WEBIST 2009 - Proceedings of the Fifth International Conference on Web Information Systems and Technologies, Lisbon, Portugal, March 23-26, 2009.
 2008 Fabian Abel , Nicola Henze , Daniel Krause: Ranking in Folksonomy Systems: Can context help? Proceedings of the Seventeenth ACM Conference on Information and Knowledge Management, CIKM 2008, Napa, USA, October 26-30, 2008. Fabian Abel, Nicola Henze, Daniel Krause: Exploiting additional Context for Graph-based Tag Recommendations in Folksonomy Systems. IEEE/ ACM Conference onWeb Intelligence, December 9-12, 2008, Sydney, Australia. Fabian Abel, Nicola Henze, Daniel Krause: Search in Folksonomy Systems: Can groups help?. ACM 17th Conference on Information and Knowledge Management, October 26-30, 2008, Napa Valley, California, USA. Fabian Abel, Nicola Henze, Daniel Krause, Daniel Plappert: User Modeling and User Profile Exchange for SemanticWeb Applications. 16thWorkshop on Adaptivity and User Modeling in Interactive Systems, LWA 2008: Lernen - Wissen - Adaption, October 6-8, 2008,Würzburg, Germany. Fabian Abel, Ig Ibert Bittencourt, Nicola Henze, Daniel Krause, Julita Vassileva: A Rule-Based Recommender System for Online Discussion Forums. 5th International Conference on Adaptive Hypermedia and Adaptive Web-Based Systems, July 28-August 1, 2008, Hannover, Germany. Fabian Abel, Nicola Henze, Daniel Krause: A Novel Approach to Social Tagging: GroupMe!. 4th International Conference on Web Information Systems and Technologies, May 4-7, 2008, Funchal/Madeira, Portugal 2008. Fabian Abel, Nicola Henze, Daniel Krause, Matthias Kriesell: On the Effect of Group Structures on Ranking Strategies in Folksonomies.Workshop on Social Web Search and Mining, April 22, 2008, Beijing, China, co-located with WWW2008. Fabian Abel, Nicola Henze, Daniel Krause: GroupMe! – Where Information meets. 17th International World Wide Web Conference, April 21-25, 2008, Beijing, China. Fabian Abel, Mischa Frank, Nicola Henze, Daniel Krause, Patrick Siehndel: GroupMe! – Combining Ideas ofWikis, Social Bookmarking, and Blogging. International Conference on Weblogs and Social Media, March 31-April 2, 2008, Seattle, USA. 2007 Fabian Abel, Mischa Frank, Nicola Henze, Daniel Krause, Daniel Plappert, and Patrick Siehndel: GroupMe! - Where Semantic Web meets Web 2.0. Semantic Web Challenge, 6th International Semantic Web Conference, November 11-15, 2007, Busan, Korea Fabian Abel, Juri L. De Coi, Nicola Henze, Arne Koesling, Daniel Krause, and Daniel Olmedilla. Enabling advanced and context-dependent access control in rdf stores. In International Semantic Web Conference. Springer, November 2007. G. Antoniou, U. Assmann, C. Baroglio, S. Decker, N. Henze, P.-L. Patranjan, R. Tolksdorf (Eds.): Reasoning Web. Springer 2007, ISBN: 978-3-540-74613-3 Fabian Abel, Nicola Henze, and Daniel Krause: GroupMe! - Capturing Semantics in Social Tagging Systems. I-SEMANTICS '07, 3rd International Conference on Semantic Technologies, September 2007, Graz P. Brusilovsky, N. Henze: Open Corpus Adaptive Educational Hypermedia. In P. Brusilovsky, A. Kobsa, W. Nejdl (Eds.) The Adaptive Web. Springer, 2007, ISBN 978-3-540-72078-2. Sergey Sosnovsky, Peter Dolog, Nicola Henze, Peter Brusilovsky, Wolfgang Nejdl: Translation of Overlay Models of Student Knowledge for Relative Domains Based on Domain Ontology Mapping. 13th International Conference on Artificial Intelligence in Education (AIED 2007), July 2007, USA. 
 2006
 P. Barahona, F. Bry, E. Franconi, N. Henze, U. Sattler (Eds.): Reasoning Web. Springer, 2006, ISBN 3-540-38409-X. Nicola Henze and Daniel Krause: Scalable Matchmaking for a Semantic Web Service based Architecture - Workshop on Semantics for Web Services, December 4, 2006, Zurich, Switzerland, collocated with ECOWS 2006 F. Abel, I. Brunkhorst, N. Henze, D. Krause, K. Mushtaq, P. Nasirifard and K. Tomaschewski: Personal Reader Agent: Personalized Access to Configurable Web Services. ABIS 2006 - 14th Workshop on Adaptivity and User Modeling in Interactive Systems, Hildesheim, October 9-11 2006. Nicola Henze and Daniel Krause: User Profiling and Privacy Protection for a Web Service Oriented Semantic Web. ABIS 2006 - 14th Workshop on Adaptivity and User Modeling in Interactive Systems, Hildesheim, October 9-11 2006. M. Baldoni, C. Baroglio, I. Brunkhorst, N. Henze, E. Marengo and V. Patti: A Personalization Service for Curriculum Planning. ABIS 2006 - 14th Workshop on Adaptivity and User Modeling in Interactive Systems, Hildesheim, October 9-11 2006. Nicola Henze and Daniel Krause: Personalized Access to Web Services in the Semantic Web. SWUI 2006 - 3rd International Semantic Web User Interaction Workshop, November 6, 2006, Athens, Georgia, USA, collocated with ISWC 2006 Nicola Henze: Personalisierbare Informationssysteme im Semantic Web. In T. Pellegrini, A. Blumauer (Hrsg.): Semantic Web: Wege zur vernetzten Wissensgesellschaft. Springer, 2006, ISBN 3-540-29324-8. Nicola Henze: A Definition of Adaptive Educational Hypermedia Systems. Article in the Encyclopedia of Multimedia. Springer, 2006, ISBN: 0-387-24395-X. Lilia Cheniti-Belcadhi, Nicola Henze, Rafik Braham: Implementation of a Personalized Assessment Web Service. 6th IEEE International Conference on Advanced Learning Technologies, ICALT 2006, July 5-7 2006, the Netherlands. Nicola Henze: Personalized e-Learning in the Semantic Web. First International Conference on Interactive Mobile and Computer Aided Learning, Amman, Jordan, April 19-21 2006. Nicola Henze: Personalized e-Learning in the Semantic Web. Extended version of 4. International Journal of Emerging Technologies in Learning (iJET), Vol. 1, No. 1 (2006). 2005
 Fabian Abel, Robert Baumgartner, Adrian Brooks, Christian Enzi, Georg Gottlob, Nicola Henze, Marcus Herzog, Matthias Kriesell, Wolfgang Nejdl, Kai Tomaschewski: The Personal Publication Reader. Semantic Web Challenge, 4th International Semantic Web Conference, November 6-10 2005, Galway, Ireland. Stefania Ghita, Nicola Henze, Wolfgang Nejdl: Task Specific Semantic Views: Extracting and Integrating Contextual Metadata from the Web . 1st Workshop on "The Semantic Desktop - Next Generation Personal Information Management and Collaboration Infrastructure", 4th International Semantic Web Conference, November 6-10 2005, Galway, Ireland. Fabian Abel, Nicola Henze: User Awareness and Personalization in Semantic Portals. Demonstration Paper, 4th International Semantic Web Conference, November 6-10 2005, Galway, Ireland. Lilia Cheniti-Belcadhi, Nicola Henze, Rafik Braham: Towards a Service Based Architecture for Assessment. Proceedings of the Thirteenth GI-Workshop on Adaptation and User Modeling in interactive Systems (ABIS 04), October 2005, Saarbrücken, Germany. Nicola Henze: E-Learning in the Semantic Web: The Personal Learning Object Readers. Joint Workshop of Cognition and Learning through Media-Communication for Advanced E-Learning II (JWCL2), September 28-30 2005, Tokyo, Japan. Nicola Henze: Personal Readers: Personalized Learning Object Readers for the Semantic Web. 12th International Conference on Artificial Intelligence in Education, AIED'05, 18-22 July 2005, Amsterdam, The Netherlands. Nicola Henze: Interactive-Event: Personalized e-Learning Services for the Semantic Web . 12th International Conference on Artificial Intelligence in Education, AIED'05, 18-22 July 2005, Amsterdam, The Netherlands. Matteo Baldoni, Cristina Baroglio, Nicola Henze: Personalization for the Semantic Web. . Reasoning Web, First International Summer School, LNCS, 2005. Ingo Brunkhorst und Nicola Henze: User Awareness in Semantic Portals. Accepted for publication in PerSWeb'05, International Workshop on Personalization on the Semantic Web, 24 -25 July 2005, Edinburgh, UK, in conjunction with UM'05. Nicola Henze: Personalization Services for e-Learning in the Semantic Web. 2nd International Workshop on Adaptive Systems for Web-Based Education: Tools and reusability (WASWBE'05) at AIED'05, 18-22 July 2005, Amsterdam, The Netherlands. Robert Baumgartner, Nicola Henze, and Marcus Herzog: The Personal Publication Reader: Illustrating Web Data Extraction, Personalization and Reasoning for the Semantic Web.  European Semantic Web Conference ESWC 2005, Heraklion, Greece, May 29 - June 1 2005. Nicola Henze: Personalization Services for the Semantic Web: The Personal Reader Framework. Framework 6 Project Collaboration for the Future Semantic Web Workshop at European Semantic Web Conference ESWC 2005, Heraklion, Greece, May 29 - June 1 2005. Stefan Decker, Michael Sintek, Andreas Billig, Nicola Henze, Peter Dolog, Wolfgang Nejdl, Andreas Harth, Andreas Leicher, Susanne Busse, Jörn Guy Süß, Zoltan Mikols, Jose-Luis Ambite, Matthew Weathers, Gustaf Neumann, Uwe Zdun: Triple - and RDF Rule Language with Context and Use Cases. W3C Workshop on Rule Languages for Interoperability, 27-28. April 2005, Washington, D.C., USA. Francois Bry, Nicola Henze: Personalisierung. Informatik Spektrum 28(3), June 2005. Robert Baumgartner, Christian Enzi, Nicola Henze, Marc Herrlich, Marcus Herzog, Matthias Kriesell, and Kai Tomaschewski: Semantic Web enabled Information Systems: Personalized Views on Web Data. International Ubiquitous Web Systems and Intelligence Workshop (UWSI 2005), Co-located with ICCSA 2005, Suntec Singapore, 9-12 May 2005.
 2004
 Grigoris Antoniou, Matteo Baldoni, Cristina Baroglio, Robert Baumgartner, Francois Bry, Thomas Eiter, Nicola Henze, Marcus Herzog, Wolfgang May,  Viviana Patti, Sebastian Schaffert, Roman Schindlauer, Hans Tompits: Reasoning Methods for Personalization on the Semantic Web. Annals of Mathematics, Computing & Telefinformatics (AMCT), Vol.2, No., 1, pp 1-24. Nicola Henze and Wolfgang Nejdl: A Logical Characterization of Adaptive Educational Hypermedia. New Review on Hypertext and Hypermedia (NRHM), 2004, Vol. 10, Number 1, pp 77 - 113. Nicola Henze, Peter Dolog, and Wolfgang Nejdl: Reasoning and Ontologies for Personalized E-Learning.  Educational Technology & Society, 2004, Vol. 7, Issue 4. Lilia Cheniti-Belcadhi, Rafik Braham, Nicola Henze, and Wolfgang Nejdl: A Generic Framework for Assessment in Adaptive Educational Hypermedia. Proceedings of the IADIS WWW / Internet 2004 Conference, October 2004, Madrid, Spain.
Extended version appeared in IADIS International Journal on WWW/Internet, Volume V III, 1, 2005. Nicola Henze and Marc Herrlich: The Personal Reader: A Framework for Enabling Personalization Services on the Semantic Web. Proceedings of the Twelfth GI-Workshop on Adaptation and User Modeling in interactive Systems (ABIS 04), October 2004, Berlin, Germany. Lilia Cheniti-Belcadhi, Nicola Henze, Rafik Braham: An Assessment Framework for eLearning in the Semantic Web. Proceedings of the Twelfth GI- Workshop on Adaptation and User Modeling in interactive Systems (ABIS 04), October 2004, Berlin, Germany. Peter Dolog, Nicola Henze, Wolfgang Nejdl, and Michael Sintek: The Personal Reader: Personalizing and Enriching Learning Resources using Semantic Web Technologies. International Conference on Adaptive Hypermedia and Adaptive Web-Based Systems (AH 2004), August 2004. Nicola Henze and Matthias Kriesell: Personalization Functionality for the Semantic Web: Architectural Outline and First Sample Implementations. First International Workshop on Engineering the Adaptive Web (EAW 2004), co-located with International Conference on Adaptive Hypermedia and Adaptive Web-Based Systems (AH 2004), August 2004. Peter Dolog, Nicola Henze, Wolfgang Nejdl, and Michael Sintek: Personalization in Distributed e-Learning Environments. International World Wide Web Conference, Education Track, May 2004, New York. 
 2003
 Peter Dolog, Nicola Henze, Wolfgang Nejdl, and Michael Sintek: Towards the Adaptive Semantic Web. 1st Workshop on Principles and Practice of Semantic Web Reasoning (PPSWR'03), co-located with International Conference on Logic Programming (ICLP'03), Dec. 8, 2003, Mumbai, India. Peter Dolog and Nicola Henze: Personalization Services for Adaptive Educational Hypermedia. 11. GI-Workshop "Adaptivität und Benutzermodellierung in interaktiven Softwaresystemen" (ABIS 03) Workshop, October 6-8, Karlsruhe, Germany.  Nicola Henze: From Web-based Educational Systems to Education on the Web: On the road to the Adaptive Web. AI Techiques in Web-based Educational Systems, Invited Session at KES 2003, 7th International Conference on Knowledge-Based Intelligent Information & Engineering Systems, September 3-5, 2003, Oxford, UK.  Peter Dolog, Nicola Henze and Wolfgang Nejdl: Logic-Based Open Hypermedia for the Semantic Web. Proceedings of 1st International Workshop on Hypertext and Semantic Web, International Hypertext Conference, August 26-31, Nottingham, UK. N. Henze and W. Nejdl: Logically Characterizing Adaptive Educational Hypermedia Systems. In Proc. of AH2003 Workshop, World Wide Web Conference, May, 2003.  N. Henze and W. Nejdl: Logically Characterizing Adaptive Educational Hypermedia Systems. Extended Technical Report, April 2003.
 2002
 M. Baldoni, C. Baroglio, N. Henze, V. Patti: Setting up a Framework for Comparing Adaptive Educational Hypermedia: First Steps and Application on Curriculum Sequencing. ABIS Workshop 2002: Personlization for the Mobile World, Oktober 9 -11, Hannover, Germany. N. Henze and W.Nejdl: Knowledge Modeling for Open Adaptive Hypermedia. 2nd International Conference on Adaptive Hypermedia and Adaptive Web Based Systems, May 29-31, 2002, Malaga, Spain.  Barbara Kieslinger, Bernd Simon, Gorazd Vrabic, Gustaf Neumann, Juan Quemada, Nicola Henze, Sigrun Gunnersdottir, Stefan Brantner, Tilman Kuechler, Wolf Siberski, Wolfgang Nejdl: "ELENA -  Creating a Smart Space for Learning", Late-Breaking topics session at International Semantic Web Conference (ISWC 2002), to be held in Sardinia, Italy, from June 9-12, 2002. 
 2001
 N. Henze Open Adaptive Hypermedia: An approach to adaptive information presentation on the Web. First International Conference on Universal Access in Human-Computer Interaction (UAHCI 2001), held jointly with HCI International 2001, 5-10 August 2001, New Orleans, Louisiana, USA. N.Henze, C. Schmidt, M. Wolpers Mediengestützte Didaktik für qualitative Methoden in der Sozialforschung auf der Basis semantischer Modellierung. "Virtueller Campus", 19. -21.9.2001, Hildesheim, Germany.  N. Henze Towards Open Adaptive Hypermedia. 9. ABIS-Workshop 2001, im Rahmen der Workshopwoche "Lernen - Lehren - Wissen - Adaptivität" (LLWA 01) , 8.-10. Oktober 2001, Dortmund. N.Henze and W. Nejdl Adaptation in Open Corpus Hypermedia. International Journal of Artificial Intelligence in Education, vol. 12, (2001).

2000
 Nicola Henze: Research Issues for Open Adaptive Hypermedia Systems. Invited talk at FGML 2000: "Fachgruppentagung Maschinelles Lernen", 18-20 September 2000, Bonn, Germany.  N. Henze and W. Nejdl: "Extendible Adaptive Hypermedia Courseware: Integrating Different Courses and Web Material". International Conference on Adaptive Hypermedia and Adaptive Web-Based Systems (AH 2000), 28-31 August 2000, Trient, Italy Nicola Henze: "Adaptive Hyperbooks: Adaptation for Project-Based Learning Resources"  PhD Thesis, University of Hannover, April 2000.

1999
 Nicola Henze, Wolfgang Nejdl and Martin Wolpers: Modeling Constructivist Teaching Functionality and Structure in the KBS Hyperbook System. Computer Supported Collaborative Learning Conference (CSCL'99), Stanford, CA, USA, December 12-15, 1999 Nicola Henze, Kabil Naceur, Wolfgang Nejdl and Martin Wolpers: Adaptive Hyperbooks for Constructivist Teaching. KI-Themenheft vol. 4, 1999: Intelligente Systeme und Teleteaching. Nicola Henze: Evaluation zur Vorlesung Grundzüge der Informatik WS 98/99. Technical Report, September 1999. Nicola Henze and Wolfgang Nejdl: Bayesian Modeling for Adaptive Hypermedia Systems. ABIS99, 7. GI-Workshop Adaptivität und Benutzermodellierung in interaktiven Softwaresystemen 29./30.9.1999, Otto-von-Guericke-Universität Magdeburg.  Nicola Henze, Wolfgang Nejdl and Martin Wolpers: Modeling Constructivist Teaching Functionality and Structure in the KBS Hyperbook System. AIED99 Workshop on Ontologies for Intelligent Educational Systems, Le Mans, France, July 18-19, 1999  Nicola Henze and Wolfgang Nejdl: Student Modeling for the KBS Hyperbook System using Bayesian Networks. Extended Report Nicola Henze and Wolfgang Nejdl: Student modeling in an active learning environment using bayesian networks. UM 99 7-th International Conference on User Modeling. June 20-24, 1999, Banff, Canada. Nicola Henze and Wolfgang Nejdl: Adaptivity in the KBS Hyperbook System. 2nd Workshop on User Modeling and Adaptive Systems on the WWW, May 11th, Toronto, Canada. Held in conjunction with the World Wide Web Conference (WWW 8), and the Seventh International Conference on User Modeling (UM 99). Nicola Henze and Wolfgang Nejdl: Student Modeling for the KBS Hyperbook System using Bayesian Networks. Technical Report.

1998
 Nicola Henze and Wolfgang Nejdl: Constructivism in Computer Science Education: Evaluating a Teleteaching Environment for Project Oriented Learning.   Interactive Computer aided Learning - Concepts and Applications (ICL 98), Villach, Österreich.  Heike Franosch, Nicola Henze, Wolfgang Nejdl and Martin Wolpers: From Modeling to Navigation: How to Use a Hyperbook Model For Developing Hypertext Books. Second International Workshop on Knowledge Representation for Interactive Multimedia Systems: Research and Experience (KRIMS II) Nicola Henze and Wolfgang Nejdl: Das KBS Virtual Classroom Project: Informatik-Ausbildung ueber das Internet, GI Fachtagung Informatik und Ausbildung, 30.3.-1.4.1998, Stuttgart Peter Fröhlich, Nicola Henze and Wolfgang Nejdl Hyperbook Data Modeling,  International Conference on Electronic Publishing, Document Manipulation and Typography, 1-3 April, 1998, Saint Malo, France.
 1997 Peter Fröhlich, Nicola Henze and Wolfgang Nejdl Conceptual Modeling for Educational Hyperbooks. Pung Hung Keng, Chua Tat Seng (Eds.):  Multimedia Modeling: Modeling Multimedia Information and Systems (MMM'97), World Scientific.  Nicola Henze and Wolfgang Nejdl. A Web-Based Learning Environment: Applying Constructivist Teaching Concepts in Virtual Learning Environments   1997 IFIP 3.3 and 3.6 Joint Working Conference "The Virtual Campus: Trends for Higher Education and Training", November 27 - 29, Madrid, Spain.  Peter Fröhlich, Nicola Henze and Wolfgang Nejdl. Meta-Modeling for Hypermedia Design Second IEEE Metadata Conference, 16 - 17 September 1997, Maryland.  Wolfgang Nejdl and Nicola Henze Multimedia und Internet in der Lehre Technical Report.  Nicola Henze Auswertung der Befragung der Teilnehmer der Vorlesung Grundzüge der Informatik - Einführung in die Programmierung mit Ada95 im WS 96/97 . Report.  Nicola Henze and Wolfgang Nejdl Eine Internet-basierte virtuelle Lernumgebung . Hannover UNI INTERN, Jahrgang 24, Nr. 1, July 1997  Peter Fröhlich, Nicola Henze and Wolfgang Nejdl Virtual Institutes and Virtual Classrooms How To Enhance Teaching and Mentoring Productivity . In European Conference on Virtual Enterprises and Networked Solutions, April 07th to 10th 1997, Paderborn, 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