Semantic Technologies

In recent years the Semantic Web has emerged as one of the most essential achievements for the future of the World Wide Web (WWW). Semantic Web technology extends the WWW but also enables to improve applications which are related to other fields such as communication, information, knowledge, media, and interaction technologies. Semantic Web provides not just new technologies and tools but also new paradigms and ways of thinking, to make information processing more efficient and more structured.

Our research is focussed on the devolpment and improvement of 'semantically supported multimedia retrieval and search technologies'.

Table of Contents

  • Current News
  • Prior Events and Activities
  • Research Topics
  • Research Team
  • Former Team Members
  • Teaching
  • Supervised Master Theses
  • Projects and Partners
  • In the Media
  • Recent Publications

Research Topics

  • (1) Semantic Multimedia
  • (2) Linked Data Engineering and Applications
  • (3) Semantically enhanced Information Retrieval (Semantic Search)
  • (4) Knowledge Mining and Ontological Engineering
  • (5) Semantically enriched e-Learning Applications

Job Offers

Research Team

Former Team Members

  • Dr. Olaf Hartig (PostDoc)
  • Dinesh Reddy, M.Sc.
  • Tamara Bobic, M.Sc.
  • Dipl.-Inf. Katarina Birghan
  • Bernhard Quehl, M.Sc.
  • Dr. Nadine Steinmetz
  • Dr. Haojin Yang
  • Dipl.-Inf. Lina Wolf
  • Dipl.-Dokumentar Johannes Hercher
  • Joscha Jäger, M.A. (internship)
  • Johannes Osterhoff, M.A.
  • Dipl.-Inf. Zalan Kramer

Our group

Left to Right: Nadine Steinmetz, Johannes Osterhoff, Dr. Harald Sack, Jörg Waitelonis, Christian Hentschel, Bernhard Quehl

Publications

  • Quantitative Analysis of Art Market Using Ontologies, Named Entity Recognition and Machine Learning: A Case Study. Filipiak, Dominik; Agt-Rickauer, Henning; Hentschel, Christian; Filipowska, Agata; Sack, Harald (2016). 79-90.
     
  • openSAP: Evaluating xMOOC Usage and Challenges for Scalable and Open Enterprise Education. Renz, Jan; Schwerer, Florian; Meinel, Christoph (2016).
     
  • Scheduling Refresh Queries for Keeping Results from a SPARQL Endpoint Up-to-Date. Knuth, Magnus; Hartig, Olaf; Sack, Harald (2016).
     
  • Don't compare Apples to Oranges - Extending GERBIL for a fine grained NEL evaluation. Waitelonis, Jörg; Jürges, Henrik; Sack, Harald (2016).
     
  • Data Integration for the Media Value Chain. Agt-Rickauer, Henning; Waitelonis, Jörg; Tietz, Tabea; Sack, Harald in 1690 (2016).
     
  • I am a Machine, let me understand Web Media!. Knuth, Magnus; Waitelonis, Jörg; Sack, Harald in LNCS (2016). 467--475.
     
  • Pre-Course Key Segment Analysis of Online Lecture Videos. Che, Xiaoyin; Staubitz, Thomas; Yang, Haojin; Meinel, Christoph (2016).
     
  • An Improved System For Real-Time Scene Text Recognition. Yang, Haojin; Wang, Cheng; Che, Xiaoyin; Luo, Sheng; Meinel, Christoph (2015). 657-660.
     
  • Optimizing the Video Experience in MOOCs. Renz, Jan; Bauer, Matthias; Malchow, Martin; Staubitz, Thomas; Meinel, Christoph (2015).
     
  • Adaptive E-Lecture Video Outline Extraction Based on Slides Analysis. Che, Xiaoyin; Yang, Haojin; Meinel, Christoph (2015). 59-68.
     
  • DBpedia Commons: Structured Multimedia Metadata from the Wikimedia Commons. Vaidya, Gaurav; Kontokostas, Dimitris; Knuth, Magnus; Lehmann, Jens; Hellmann, Sebastian in Lecture Notes in Computer Science, M. Arenas, Corcho, O., Simperl, E., Strohmaier, M., d'Aquin, M., Srinivas, K., Groth, P. T., Dum, M. (reds.) (2015). (Vol. 9367) 281--289.
     
  • Smart Media Navigator: Visualizing Recommendations based on Linked Data. Tietz, Tabea; Waitelonis, Jörg; Jäger, Joscha; Sack, Harald (2014). 48 - 51.
     
  • Semantic Multimedia Information Retrieval Based on Contextual Descriptions. Steinmetz, Nadine; Sack, Harald (2013).
     
  • openHPI: Evolution of a MOOC Platform from LMS to SOA. Totschnig, Michael; Willems, Christian; Meinel, Christoph (2013). 49-54.
     
  • Tree-structure Outline Generation for Lecture Videos with Synchronized Slides. Che, Xiaoyin; Yang, Haojin; Meinel, Christoph (2013). 87-92.
     
  • CONTENTUS - technologies for next generation multimedia libraries. Nandzik, Jan; Litz, Berenike; Flores-Herr, Nicolas; Löhden, Aenne; Konya, Iuliu; Baum, Doris; Bergholz, André; Schönfuß, Dirk; Fey, Christian; Osterhoff, Johannes; Waitelonis, Jörg; Sack, Harald; Köhler, Ralf; Ndjiki-Nya, Patrick in Multimedia Tools and Applications (2013). 63(2) 287-329.
     
  • Lecture Video Segmentation by Automatically Analyzing the Synchronized Slides. Che, Xiaoyin; Yang, Haojin; Meinel, Christoph (2013). 345-348.
     
  • openHPI - a Case-Study on the Emergence of two Learning Communities. Grünewald, Franka; Mazandarani, Elnaz; Meinel, Christoph; Teusner, Ralf; Totschnig, Michael; Willems, Christian (2013).
     
  • Towards exploratory video search using linked data. Waitelonis, Jörg; Sack, Harald in Multimedia Tools and Applications (2012). 59(2) 645 - 672.
     
  • An Automated Analysis and Indexing Framework for Lecture Video Portal. Yang, Haojin; Oehlke, Christoph; Meinel, Christoph in lecture notes in computer science (2012). 285--294.
     
  • Text Detection in Video Images Using Adaptive Edge Detection and Stroke Width Verification. Haojin Yang, Bernhard Quehl; Sack, Harald (2012).
     
  • Open Up Cultural Heritage in Video Archives with Mediaglobe. Hentschel, Christian; Hercher, Johannes; Knuth, Magnus; Osterhoff, Johannes; Quehl, Bernhard; Sack, Harald; Steinmetz, Nadine; Waitelonis, Jörg; Yang, Haojin in Lecture Notes in Informatics (2012).
     
  • Open Up Cultural Heritage in Video Archives with Mediaglobe. Hentschel, Christian; Hercher, Johannes; Knuth, Magnus; Osterhoff, Johannes; Quehl, Bernhard; Sack, Harald; Steinmetz, Nadine; Waitelonis, Jörg; Yang, Haojin in Lecture Notes in Informatics (2012).
     
  • A framework for improved video text detection and recognition. YANG, Haojin; Quehl, Bernhard; Sack, Harald in Multimedia Tools and Applications (2012). 69(1) 217-245.
     
  • Cross-Dataset Learning of Visual Concepts In: Adaptive Multimedia Retrieval: User, Context, and Feedback. Hentschel, Chirstian; Sack, Harald; Steinmetz, Nadine (2012).
     
  • A Skeleton based Binarization Approach for Video Text Recognition. Yang, Haojin; Quehl, Bernhard; Sack, Harald (2012).
     
  • Automated Extraction of Lecture Outlines from Lecture Videos: a Hybrid Solution for Lecture Video Indexing. Yang, Haojin; Gruenewald, Franka; Meinel, Christoph (2012).
     
  • Lecture Video Indexing and Analysis Using Video OCR Technology. Yang, Haojin; Siebert, Maria; Lühne, Patrick; Sack, Harald; Meinel, Christoph (2011).
     
  • Lecture Video Indexing and Analysis Using Video OCR Technology. Yang, Haojin; Sack, Harald; Meinel, Christoph in International Journal of Multimedia Processing and Technologies (JMPT) (2011). 2(4) 176-196.
     
  • Sneak Preview? Instantly Know What To Expect In Faceted Browsing. Osterhoff, Johannes; Waitelonis, Jörg; Jäger, Joscha; Sack, Harald (2011).
     
  • A Solution for German Speech Recognition for Analysis and Processing of Lecture Videos. Yang, Haojin; Oehlke, Christoph; Meinel, Christoph (2011).
     
  • RISQ! Renowned Individuals Semantic Quiz – A Jeopardy like Quiz Game for Ranking Facts. Wolf, Lina; Knuth, Magnus; Osterhoff, Johannes; Sack, und Harald in ICPS (2011).
     
  • Named Entity Recognition for User-Generated Tags. Ludwig, Nadine; Sack, Harald in CS (2011).
     
  • Automatic Lecture Video Indexing Using Video OCR Technology. Yang, Haojin; Siebert, Maria; Lühne, Patrick; Sack, Harald; Meinel, Christoph (2011).
     
  • Towards exploratory video search using linked data. Waitelonis, Jörg; Sack, Harald (2011). (Vol. 53) 1-28.
     
  • The Generation of User Interest Profiles from Semantic Quiz Games. Knuth, Magnus; Ludwig, Nadine; Wolf, Lina; Sack, Harald (2011).
     
  • Improving Search in Tele-Lecturing: Using Folksonomies as Trigger to Query Semantic Datasets to Extract Additional Metadata. Franka Moritz, Maria Siebert; Meinel, Christoph (2011).
     
  • Community Tagging in Tele-Teaching Environments. Grünewald, Franka; Siebert, Maria; Meinel, Christoph (2011).
     
  • WhoKnows? - Evaluating Linked Data Heuristics with a Quiz that Cleans Up DBpedia. Ludwig, Nadine; Waitelonis, Jörg; Knuth, Magnus; Sack, Harald in LNCS (2011).
     
  • Realization of an Expandable Search Function for an E-Learning Web Portal. Siebert, Maria; Meinel, Christoph in ACIS (2010). 361-366.
     
  • Indexing German Audiovisual Heritage - SKOSification Made Easy. Hercher, Johannes; Sack, Harald (2010).
     
  • The Path is the Destination -- Enabling a New Search Paradigm with Linked Data. Waitelonis, Jörg; Knuth, Magnus; Wolf, Lina; Hercher, Johannes; Sack, Harald in CEUR Workshop Proceedings (2010). (Vol. 700)
     
  • Semantische Suche - Theorie und Praxis am Beispiel der Videosuchmaschine yovisto.com. Sack, Harald in Web 3.0 & Semantic Web, HMD - Praxis der Wirtschaftsinformatik, (U. Hentgartner; Meier, A., reds.) (2010). 271
     
  • Exploratory Semantic Video Search with yovisto. Waitelonis, Jörg; Sack, Harald (2010). 446-447.
     
  • Unsupervised Matching of Object Models and Ontologies. Quasthoff, Matthias; Völkel, Max; Meinel, Christoph (2010). 7.
     
  • Tracing the Provenance of Object-Oriented Computations on RDF Data. Quasthoff, Matthias; Meinel, Christoph in 576 (2010). paper 4.
     
  • Enabling Reputation Interoperability through Semantic Technologies. Alnemr, Rehab; Paschke, Adrian; Meinel, Christoph (2010). No.13.
     
  • SEMANTISCHE SUCHE-Theorie und Praxis am Beispiel der Videosuchmaschine yovisto.com. Sack,; Harald, (2010). 13-25.
     
  • Community Rating in the Tele-Lecturing Context. Moritz, Franka; Siebert, Maria; Meinel, Christoph (2010).
     
  • A Linked Data Web Programm Framework. Quasthoff, Matthias; Meinel, Christoph in LNCS (2010).
     
  • Distributed Recognition of Content Similarity in a Tele-Teaching Portal. Siebert, Maria; Moritz, Franka; Meinel, Christoph (2010).
     
  • Semantically Enabled Exploratory Video Search. Waitelonis, Jörg; Sack, Harald; Kramer, Zalan; Hercher, Johannes (2010). 8:1-8:8.
     
  • Establishing an Expandable Architecture for a tele-Teaching Platform. Siebert, Maria; Moritz, Franka; Meinel, Christoph in ACIS (2010). 323-328.
     
  • Use What You Have -- Yovisto Video Search Engine Takes a Semantic Turn. Waitelonis, Jörg; Ludwig, Nadine; Sack, Harald (2010).
     
  • How to Simplify Building Semantic Web Applications. Quasthoff, Matthias; Sack, Harald; Meinel, Christoph in CEUR Workshop Proceedings (2009). (Vol. 524)
     
  • Augmenting Video Search with Linked Open Data. Waitelonis, Jörg; Sack, Harald in J.UCS Conference Proceedings Series (2009). 550-558.
     
  • Linking the tele-TASK Video Portal to the Semantic Web. Baumann, Bert; Sack, Harald; Groß, Andreas; Meinel, Christoph (2009). (Vol. 148) 205-216.
     
  • Towards Exploratory Video Search Using Linked Data. Waitelonis, Jörg; Sack, Harald (2009). 540 - 545.
     
  • Semantic Web Admission Free – Obtaining RDF and OWL Data from Application Source Code. Quasthoff, Matthias; Meinel, Christoph (2008).
     
  • Automatische Erzeugung Semantischer Annotationen für Vorlesungsvideos. Repp, Stephan; Linckels, Serge; Meinel, Christoph (2008). (Vol. 132GI) 149-160.
     
  • Encouraging Participation in Virtual Communities - The IT-Summit Blog Case. Bross, Justus; Sack, Harald; Meinel, Christoph in Int. Journal on WWW/Internet (2007). 5(2) 113-129.
     
  • Encouraging Participation in Virtual Communities: The "IT-summit-blog" Case. Bross, Justus; Sack, Harald; Meinel, Christoph (2007). 245 - 254.
     
  • Why HTTPS Is Not Enough - A Signature-Based Architecture for Trusted Content on the Social Web. Quasthoff, Matthias; Sack, Harald; Meinel, Christoph (2007). 820 - 824.
     
  • Course Management in the Twinkle of an Eye. Meinel, Christoph; Sack, Harald; Schillings, Volker (2002). 281-283.
     
  • IDDS: An Interactive Decentralized Documentation System. Meinel, Christoph; Sack, Harald; Schillings, Volker (2001).
     
  • A Search-Engine-Topology to Improve Document Retrieval on the Web. Roth, Uwe; Heuer, Andreas; Haffner, Ernst-Georg; Meinel, Christoph (2000). 470-475.
     
  • Integration der Schleusentechnologie "Lock-Keeper" in moderne Sicherheitsarchitekturen. Haffner, Ernst-Georg; Engel, Thomas; Meinel, Christoph (2000).
     
  • Mod-p-DDs: A Data-Structure for Multiple-Valued Functions. Sack, Harald; Dubrova, Elena; Meinel, Christoph (2000). 233-238.
     

Projects and Partners

 

  • AV-Portal Gottfried-Leibnitz-Universität Hannover, project with Technische Informationsbibliothek Hannover (TIB)
  • Semantic Media Explorer (SEMEX)
    The Semantic Media Explorer is a demonstrator that combines the latest media analysis processes to provides optimal access to video content.
  • MEDIAGLOBE Project
    The aim of MEDIAGLOBE is to open and interlink heterogenouse and currently isolated information sources in media archives and broadcasting corporation. Project partners: DEFA-spektrum, Medienbildungsgesellschaft Babelsberg mbH, Blue Order GmbH
  • THESEUS/CONTENTUS Project
    The purpose of CONTENTUS is to develop basic technologies with which to access, archive and search for multi-media cultural assets and works of art.
  • YOVISTO
    Yovisto is a video search engine specialized in academic content. Yovisto's search index is based on the combination of automated content based video analysis with user generated collaborative annotation (collaborative tagging, discussions, and comments). In difference to traditional video search engines, Yovisto enables pinpoint access within video data by providing fine-granular, time-dependent metadata.
  • Semantic Games
    Games with a purpose that are dedicated to create and curate semantic content.

Current News

Prior Events and Activities

 

2011

2010

2009

Teaching

 

 

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2014 (SS)

2013/14 (WS)

2013 (SS)

  • Seminar (Master): Semantic Multimedia (Blog)
  • Seminar (Bachelor): Multimedia Analyse Technologien (Blog)
  • Schülerkolleg (für Schüler der 8. bis 10. Klasse): Internetsuche und Google PageRank - Wie wird was durch wen gefunden?

    • Woche 1 - 09.04.2013: Die Geschichte der Web-Suchmaschinen (pdf)
    • Woche 2 - 23.04.2013: Term- und Dokumentenranking (pdf)
    • Woche 3 - 07.05.2013: Google Page Rank (pdf)
    • Woche 4 - 21.05.2013: Personalisierung und Web Crawling (pdf)
    • Woche 5 - 04.06.2013: Semantische Suche

 

 

2012/13 (WS)

2012 (SS)

2011/12 (WS)

2011 (SS)

2010/11 (WS)

2010 (SS)

2009/10 (WS)

 

 

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Supervised Master Theses

  • Gerald Töpper: Erweiterung der DBpedia Ontologie und des Extraction Frameworks zur Sicherung der Datenqualität. (finished April 2012)
  • Peter Retzlaff: Visualisierung von Bag-of-Visual-Words-Vektoren für die Visual Concept Detection (finished March 2014)
  • Sebastian Stange: Evaluierung einer semantischen Videosuche und Ermittlung geeigneter Videoanalysetechniken (finished March 2014)
  • Michael Wolowyk: Semantic Recommender Systems (preliminary title) (in progress)

Open Master Theses

Please find a list of possible topics for Master Theses. Contact us, if you are interested in one of these topics or have own suggestions.

  • Video Analysis:

    • OCR Spellcorrection
    • Tag Relevance Estimation in Photo Communities
    • Learning Local Image Descriptors

  • Linked Data and Semantic Web:

    • Named Entity Evolution
    • Authority File Mapping
    • A Mereology for Media Fragments

 

 

 

Press

 

Other Links

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... to our Publications
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