Hasso-Plattner-Institut
  
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Hasso-Plattner-Institut
  
 

Dr. Harald Sack - Semantic Technologies

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

Job Offers

Current News

Prior Events and Activities

 

2011

2010

2009

Research Topics

 

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

Our group

Left to Right: Nadine Steinmetz, Johannes Osterhoff, Dr. Harald Sack, Jörg Waitelonis, Christian Hentschel, Bernhard Quehl
Back row: Nadine Steinmetz, Dr. Harald Sack, Jörg Waitelonis, Johannes Hercher
Front row: Haojin Yang, Zalan Kramer, Johannes Osterhoff, Magnus Knuth

Research Team

  • Dr. Harald Sack (Senior Researcher, H-1.39, Tel.: -527)
  • Christian Hentschel, M.Sc. (PhD student, H-1.37, Tel.: -540)
  • Dipl.-Inf. Magnus Knuth (PhD student, H-1.38, Tel.: -547)
  • Tamara Bobic, M.Sc. (PhD student, H-1.40, Tel.: -569)
  • Dipl.-Inf. Bernhard Quehl (PhD student, H-1.40, Tel.: -548)
  • Dipl.-Inf. Jörg Waitelonis (PhD student, H-1.37, Tel.: -537)
  • Henrik Jürges (student coworker)
  • Nico Ring (student coworker)
  • Tabea Tietz (student coworker)
  • Timur Pratama Wiradarma (student coworker)
  • Sebastian Woinar (student coworker, IPv6)

Former Team Members

  • Dipl.-Inf. Katarina Birghan
  • Dipl.-Dokumentar Johannes Hercher
  • Dipl.-Inf. Zalan Kramer
  • Johannes Osterhoff, M.A.
  • Dipl.-Inf. Nadine Steinmetz
  • Dipl.-Inf. Lina Wolf
  • Dipl.-Ing. Haojin Yang
  • Leonid Berov (student coworker)
  • Moritz Finke (student coworker)
  • Peter Retzlaff (student coworker)
  • Sebastian Stange (student coworker)
  • Timo Wagner (student coworker)
  • Martin Zabel (student coworker)

Teaching

 

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)

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

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.

Press

 

Recent Publications

 

2013

  • Nadine Steinmetz, Magnus Knuth, Harald Sack:
    Statistical Analyses of Named Entity Disambiguation Benchmarks In: Proceedings of 1st Workshop on NLP&DBpedia 2013 (NLP+DBpedia 2013), held in conjunction with 12th International Semantic Web Conference (ISWC 2013) October 21-25, 2013, Sydney, Australia. [accepted]
  • Nadine Steinmetz, Harald Sack:
    About the Influence of Negative Context In: Proceedings of 7th IEEE International Conference on Semantic Computing (ICSC 2013), September 16-18, 2013, Irvine, CA, USA. [accepted]
  • Nadine Steinmetz, Harald Sack:
    Semantic Multimedia Information Retrieval Based on Contextual Descriptions In: Proceedings of 10th Extended Semantic Web Conference (ESWC 2013) - Semantics and Big Data, May 26-30, 2013, Montpellier, France. [to appear, local copy]

2012

  • P. van Emde Boas, F. C. A. Groen, G. F. Italiano, J. Nawrocky, and H. Sack (eds.):
    SOFSEM 2013: Theory and Practice of Computer Science, 39rd Conference on Current Trends in Theory and Practice of Computer Science. Harrachov, Czech Republic, January 2013, Proceedings, vol. 7741 of Lecture Notes in Computer Science, Springer, 2013 (to appear).
  • H. Sack, T. Pellegrini (Eds.):
    Proceedings of the 8th International Conference on Semantic Systems. ACM, New York, NY, USA (2012)
  • Christoph Meinel, Harald Sack:
    Internetworking - Technische Grundlagen und Anwendungen. Springer, Heidelberg (2012). [ Inhaltsverzeichnis]
  • Christian Hentschel, Harald Sack, Nadine Steinmetz:
    Cross-Dataset Learning of Visual Concepts. In AMR 2012 - 10th International Workshop on Adaptive Multimedia Retrieval (Copenhagen): 2012.10.24-25 [to appear]
  • Haojin Yang, Harald Sack, Christoph Meinel:
    Lecture Video Indexing and Analysis Using Video OCR Technology. Int. Journal of Multimedia Processing and Technologies (JMPT), Volume: 2, Issue:4, pp. 176-196, Print ISSN: 0976-4127, Online ISSN: 0976-4135, Dec. 2011 [PDF | BibTex]
  • Haojin Yang, Bernhard Quehl, Harald Sack:
    A Skeleton Based Binarization Approach for Video Text Recognition
    , 13th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS2012), Dublin, Ireland, May 23-25, 2012 (to appear).
  • Christian Hentschel, Johannes Hercher, Magnus Knuth, Johannes Osterhoff, Bernhard Quehl, Harald Sack, Nadine Steinmetz, Jörg Waitelonis, Haojin Yang:
    Open Up Cultural Heritage in Video Archives with Mediaglobe, Proceeding of the 12th International Conference on Innovative Internet Community Systems (I2CS 2012), June 13-15, Lecture Notes in Informatics, Vol. 204, Springer, 2012, pp. (to appear). (ISBN 978-3-88579-298-7) [ PDFBibTex ]
  • Magnus Knuth, Johannes Hercher, Harald Sack:
    Collaboratively Patching Linked Data
    , 2nd International Workshop on Usage Analysis and the Web of Data (USEWOD2012), co-located with the 21st International World Wide Web Conference (WWW 2012), Lyon, France, April 17th, 2012. [ PDF | BibTex ]
  • Haojin Yang, Bernhard Quehl, Harald Sack:
    Text detection in video images using adaptive edge detection and stroke width verification, 19th Int. Conf. on Systems, Signals and Image Processing (IWSSIP), IEEE Press, Vienna, Austria, April 11-13, 2012  (to appear).
  • Johannes Hercher, Marcel Ruhl, Harald Sack:
    Quo vadis nutzergenerierte Metadaten?, Social Media and Web Science, 2. DGI Konferenz, 64. Jahrestagung der DGI, Frankfurt a. M., Düsseldorf, DGI, Frankfurt am Main, March 22-23, 2012, pp. 251-262. (ISBN 978-3-925474-72-9) [ PDF | BibTex]
  • Jan Nandzik, Berenike Litz, Nicolas Flores-Herr, Aenne Löhden, Iuliu Konya, Doris Baum, André Bergholz, Dirk Schönfuß, Christian Fey, Johannes Osterhoff, Jörg Waitelonis, Harald Sack, Ralf Köhler, Patrick Ndjiki-Nya:
    CONTENTUS – Technologies for Next Generation Multimedia Libraries, Automatic multimedia processing for semantic search. In Journal for Multimedia Tools and Applications, Springer Netherlands, 2012, pp. 1-43. (ISSN 1380-7501) [ PDF | BibTex ]
  • Andreas Thalhammer, Magnus Knuth, Harald Sack:
    Evaluating Entity Summarization Using a Game-Based Ground Truth. In Proc. of 11th International Semantic Web Conference (ISWC 2012), November 11-15, 2012, Boston, USA, Springer. [PDF | BibTex]
  • Haojin Yang, Bernhard Quehl and Harald Sack, A Framework for Improved Video Text Detection and Recognition, Int. Journal of MULTIMEDIA TOOLS AND APPLICATIONS (MTAP), Print ISSN:1380-7501, online ISSN:1573-7721, Publisher: springer Netherlands. (to appear)
  • Gerald Töpper, Magnus Knuth, Harald Sack:
    DBpedia Ontology Enrichment for Inconsistency Detection. In Proc. of the 8th International Conference on Semantic Systems (I-SEMANTICS 2012), September 5-7, 2012, Graz, Austria, ACM. [PDF | BibTex]
  • Haojin Yang, Bernhard Quehl, Harald Sack:
    A Skeleton Based Binarization Approach for Video Text Recognition
    , 13th International Workshop on Image Analysis for Multimedia Interactive Services (WIAMIS2012), Dublin, Ireland, May 23-25, 2012 (to appear).
  • Christian Hentschel, Johannes Hercher, Magnus Knuth, Johannes Osterhoff, Bernhard Quehl, Harald Sack, Nadine Steinmetz, Jörg Waitelonis, Haojin Yang:
    Open Up Cultural Heritage in Video Archives with Mediaglobe, Proceeding of the 12th International Conference on Innovative Internet Community Systems (I2CS 2012), June 13-15, Lecture Notes in Informatics, Vol. 204, Springer, 2012, pp. (to appear). (ISBN 978-3-88579-298-7) [ PDFBibTex ]
  • Magnus Knuth, Johannes Hercher, Harald Sack:
    Collaboratively Patching Linked Data
    , 2nd International Workshop on Usage Analysis and the Web of Data (USEWOD2012), co-located with the 21st International World Wide Web Conference (WWW 2012), Lyon, France, April 17th, 2012. [ PDF | BibTex ]
  • Haojin Yang, Bernhard Quehl, Harald Sack:
    Text detection in video images using adaptive edge detection and stroke width verification, 19th Int. Conf. on Systems, Signals and Image Processing (IWSSIP), IEEE Press, Vienna, Austria, April 11-13, 2012  (to appear).
  • Johannes Hercher, Marcel Ruhl, Harald Sack:
    Quo vadis nutzergenerierte Metadaten?, Social Media and Web Science, 2. DGI Konferenz, 64. Jahrestagung der DGI, Frankfurt a. M., Düsseldorf, DGI, Frankfurt am Main, March 22-23, 2012, pp. 251-262. (ISBN 978-3-925474-72-9) [ PDF | BibTex]
  • Jan Nandzik, Berenike Litz, Nicolas Flores-Herr, Aenne Löhden, Iuliu Konya, Doris Baum, André Bergholz, Dirk Schönfuß, Christian Fey, Johannes Osterhoff, Jörg Waitelonis, Harald Sack, Ralf Köhler, Patrick Ndjiki-Nya:
    CONTENTUS – Technologies for Next Generation Multimedia Libraries, Automatic multimedia processing for semantic search. In Journal for Multimedia Tools and Applications, Springer Netherlands, 2012, pp. 1-43. (ISSN 1380-7501) [ PDF | BibTex ]

2011

  • Nicolas Flores-Herr, Harald Sack, Klaus Bossert:
    Suche in Multimediaarchiven von Kultureinrichtungen. D. Lewandowski (Ed.), Handbuch Internet-Suchmaschinen 2 - Neue Entwicklungen in der Websuche, Akademische Verlagsgesellschaft AKA GmbH, Heidelberg, 2011, pp. 113-140. [ PDF | BibTex ] (ISBN 978-3-89838-651-7)
  • Nicolas Flores-Herr, Stefan Eickeler, Jan Nandzik, Stefan Paal, Iuliu Konya, Harald Sack:
    Contentus – Next Generation Multimedia Library. L. Heuser & W. Wahlster (Eds.), acatech diskutiert: Internet der Dienste, Springer : Berlin ; Heidelberg, 2011, pp. 67-88. [ PDF | BibTex ]  (ISBN 978-3-642-21507-0)
  • Haojin Yang, Maria Siebert, Patrick Lühne, Harald Sack and Christoph Meinel:
    Automatic Lecture Video Indexing Using Video OCR Technology, IEEE Int. Symposium on Multimedia 2011 (ISM 2011), IEEE Press, Dana Point, CA, USA, Dec. 5-7, 2011. [ PDF | BibTex]
  • Haojin Yang, Maria Siebert, Patrick Lühne, Harald Sack and Christoph Meinel:
    Lecture Video Indexing and Analysis Using Video OCR Technology, 7th Int. Conf. on Signal Image Technology and Internet Based Systems (SITIS 2011), Track Internet Based Computing and Systems, IEEE/ACM Press, Dijon (France), Nov. 28 - Dec. 1, 2011. [ PDF | BibTex ]
  • Johannes P. Osterhoff, Jörg Waitelonis, Joscha Jäger, Harald Sack: 
    Sneak Preview? Instantly Know What To Expect In Faceted Browsing
    . In Proc. of Interaktion und Visualisierung im Daten-Web (IVDW 2011) Workshop at INFORMATIK 2011, Okt. 06,  2011, Berlin, Germany. [ PDF | BibTex ]
  • Magnus Knuth, Nadine Ludwig, Lina Wolf, Harald Sack: 
    The Generation of User Interest Profiles from Semantic Quiz Games. In Proc. of The Second International Workshop on Mining Ubiquitous and Social Environments - MUSE 2011, Sept. 05,  2011, Athens, Greece, pp. 43-53.  [ PDF | BibTex ]
  • Lina Wolf, Magnus Knuth, Johannes P. Osterhoff, Harald Sack: 
    RISQ! Renowned Individuals Semantic Quiz – A Jeopardy like Quiz Game for Ranking Facts. In Proc. of 7th Int. Conf. on Semantic Systems I-SEMANTICS, 07.-09. Sept., 2011, Graz, Austria, ACM,  2011, pp. 71-78. [ PDF | BibTex ]
  • Johannes Hercher, A. Mitzscherlich, Harald Sack: 
    Bestandsanalyse, Metadaten und Systematisierung. Vogel, A. & Effenberg, P. (Eds.) Digitalisierungsfibel, Leitfaden für audiovisuelle Archive, Potsdam, Germany, transfermedia,  2011, pp. 82-101. [ PDF | BibTex ]
  • Nadine Ludwig, Harald Sack: 
    Named Entity Recognition for User-Generated Tags. In Proc. of the 8th Int. Workshop on Text-based Information Retrieval (TIR), 29.08.-02.09, IEEE CS Press,  2011. [ PDF | BibTex ]
  • Jörg Waitelonis, Nadine Ludwig, Magnus Knuth, Harald Sack:
    Whoknows? - Evaluating Linked Data Heuristics with a Quiz that cleans up DBpedia. International Journal of Interactive Technology and Smart Education (ITSE), Emerald Group, Vol. 8,  2011 (3). (ISSN: 1741-5659) [ PDF | BibTex]
  • Haojin Yang, Christoph Oehlke and Christoph Meinel:
    A Solution for German Speech Recognition for Analysis and Processing of Lecture Videos, 10th IEEE/ACIS International Conference on Computer and Information Science (ICIS 2011) , IEEE Press, Sanya, Heinan Island, China, May 2011 [ PDF | BibTex]
  • Nadine Ludwig, Jörg Waitelonis, Magnus Knuth, Harald Sack:
    WhoKnows? - Evaluating Linked Data Heuristics with a Quiz that Cleans Up DBpedia. In Proc. of the 8th Extended Semantic Web Conference (ESWC) 29.05-02.06, Poster-Session, Springer LNCS 6643, 2011. (ISBN 978-3-642-21033-4) [ PDF | BibTex]
  • Johannes Hercher and Harald Sack: 
    Building a Research Context with Linked Bibliographic Data, OFKN Open Bibliographic Data Challenge,  Feb. 18, 2011. [ PDF  | BibTex ]
  • Jörg Waitelonis, Harald Sack: 
    Towards exploratory video search using linked data. In Multimedia Tools and Applications 53(2011), pp. 1-28, Springer Netherlands,  2011. (ISSN 1380-7501) [ PDF | BibTex ]
  • Jörg Waitelonis, Johannes P. Osterhoff, Harald Sack: 
    More than the Sum of its Parts: CONTENTUS - A Semantic Multimodal Search User Interface. In Proc. of the Workshop on Visual Interfaces to the Social and Semantic Web (VISSW ), Co-located with ACM Conf. on Intelligent User Interfaces ( IUI ), Feb 13, 2011, Palo Alto, US, CEUR Workshop Proceedings Vol. 694,  2011. (ISSN 1613-0073) [ PDFBibTex]

2010

2009

  • Matthias Quasthoff, Harald Sack, Christoph Meinel: 
    How To Simplify Building Semantic Web Applications. In Proc. of the 5th Int. Workshop on Semantic Web Enabled Software Engineering (SWESE), in conjunction with 8th Int. Semantic Web Conference (ISWC), 25-29 October 2009, Washington, DC, CEUR Workshop Proceedings, Vol. 524, 2009, pp. 45-57. (ISSN 1613-0073) [ PDF | BibTex ]
  • Jörg Waitelonis, Harald Sack: 
    Towards Exploratory Video Search by Using Linked Data. In Proc. of the 2nd IEEE Int. Workshop on Data Semantics for Multimedia Systems and Applications (DSMSA), in conjunction with IEEE International Symposium on Multimedia (ISM), 14-16 December, 2009, San Diego, California, USA, IEEE Computer Society, 2009, pp. 540-545. (ISBN 978-0-7695-3890-7) [ PDF | BibTex ]
  • Jörg Waitelonis, Harald Sack: 
    Augmenting Video Search with Linked Open Data. In Proc. of Int. Conf.i-semantics), September 2-4, 2009, Graz, Austria, on Semantic Systems ( Verlag der TU Graz, Austria, 2009. (ISBN 978-3-85125-060-2) [ PDF | BibTex]
  • Matthias Quasthoff, Harald Sack, Christoph Meinel: 
    Can Software Developers Use Linked Data Vocabulary?. In Proc. of Int. Conf. on Semantic Systems (i-semantics), September 2-4, 2009, Graz, Austria, Verlag der TU Graz, Austria, 2009. (ISBN 978-3-85125-060-2) [ PDF | BibTex ]
  • Bert Baumann, Andreas Gross, Harald Sack, Christoph Meinel: 
    Linking tele-TASK video portal to the Semantic Web. In Proc. of 9th Int. Conf. on Innovative Internet Community Systems (I2CS), June 15-17, 2009, Jena, Germany, Lecture Notes in Informatics (LNI), Vol. 148, Gesellschaft für Informatik, Bonn, Germany, 2009. (ISBN 978-3-88579-242-0) [ PDF | BibTex ]
  • Rico Landefeld, Harald Sack: 
    Collaborative Web-Publishing with a Semantic Wiki. In: S. Schaffert, T. Pellegrini, K. Tochtermann & S. Auer (Eds.): Networked Knowledge – Networked Media: Integrating Knowledge Management, New Media Technologies and Semantic Systems, Springer Heidelberg, 2009, pp. 129-140. (ISBN 978-3-64202-183-1) [ PDFBibTex]
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