Olaf Hartig

Forschungsgebiete

1. Anfragebearbeitung im Web der Daten
2. Datenqualität und Vertrauenswürdigkeit von Webdaten
3. Herkunft von Webdaten
4. Anfragebearbeitung auf RDF-Datenmengen
5. Datenschutz im Semantic Web
6. Anwendung von semantischen Technologien im Software Engineering

Aktuelle Projekte

1. SQUIN - Ein verweisbasiertes Anfrageausführungssystem für Linked Data
2. Web of Trusted Data
3. The Provenance Vocabulary

Abgeschlossene Projekte

1. DESWAP (Development Environment for Semantic Web APplications).

Publikationen

2012

• Query Prediction with Context Models for Populating Personal Linked Data Caches
  Olaf Hartig, Tom Heath
  Proceedings of the Poster Session at the 23rd ACM Conference on Hypertext and Social Media, Milwaukee, WI, USA, 2012/06 (pdf)

• Foundations of Traversal Based Query Execution over Linked Data
  Olaf Hartig, Johann-Christoph Freytag
  Proceedings of the 23rd ACM Conference on Hypertext and Social Media (HT), Semantic Data Track, Milwaukee, WI, USA, 2012/06 (pdf)

• SPARQL for a Web of Linked Data: Semantics and Computability
  Olaf Hartig
  Proceedings of the 9th Extended Semantic Web Conference (ESWC), Heraklion, Greece, 2012/05 (pdf)

• Populating Personal Linked Data Caches using Context Models
  Olaf Hartig, Tom Heath
  Proceedings of the Poster Session at the 21th International World Wide Web Conference (WWW), Lyon, France, 2012/04 (pdf)

• Towards Interoperable Provenance Publication on the Linked Data Web
  Jun Zhao, Olaf Hartig
  Proceedings of the 5th Linked Data on the Web (LDOW) Workshop at the World Wide Web Conference (WWW), Lyon, France, 2012/04 (pdf)

2011

• Zero-Knowledge Query Planning for an Iterator Implementation of Link Traversal Based Query Execution
  Olaf Hartig
  Proceedings of the 8th Extended Semantic Web Conference (ESWC), Heraklion, Greece, 2011/06 (pdf)

• A Main Memory Index Structure to Query Linked Data
  Olaf Hartig and Frank Huber
  Proceedings of the 4th Linked Data on the Web (LDOW) Workshop at the World Wide Web Conference (WWW), Hyderabad, India, 2011/03 (pdf)

• How Caching Improves Efficiency and Result Completeness for Querying Linked Data
  Olaf Hartig
  Proceedings of the 4th Linked Data on the Web (LDOW) Workshop at the World Wide Web Conference (WWW), Hyderabad, India, 2011/03 (pdf)

2010

• A Database Perspective on Consuming Linked Data on the Web
  Olaf Hartig, Andreas Langegger
  Datenbankspektrum, Semantic Web Special Issue, 2010/09 (link)

• Integrating Provenance into the Web of Data
  Olaf Hartig, Jun Zhao
  Proceedings of the Poster Session at the 7th Extended Semantic Web Conference (ESWC), Heraklion, Greece, 2010/06 (pdf)

• Towards a Data-Centric Notion of Trust in the Semantic Web (A Position Statement)
  Olaf Hartig
  Proceedings of the 2nd Workshop on Trust and Privacy on the Social and Semantic Web (SPOT) at the 7th Extended Semantic Web Conference (ESWC), Herakli, 2010/06 (pdf)

• Publishing and Consuming Provenance Metadata on the Web of Linked Data
  Olaf Hartig, Jun Zhao
  Proceedings of the 3rd International Provenance and Annotation Workshop (IPAW), Troy, New York, USA, 2010/06 (pdf)

2009

• Executing SPARQL Queries over the Web of Linked Data (Abstract)
  Olaf Hartig, Christian Bizer, Johann-Christoph Freytag
  Proceedings of the 8th International Semantic Web Conference (ISWC'09), Washington, DC, USA, 2009/10 (pdf)

• Using Web Data Provenance for Quality Assessment
  Olaf Hartig, Jun Zhao
  Proceedings of the 1st International Workshop on the Role of Semantic Web in Provenance Management (SWPM) at the International Semantic Web Conference, 2009/10 (pdf)

• Querying Trust in RDF Data with tSPARQL (Abstract)
  Olaf Hartig
  Proceedings of the 6th European Semantic Web Conference (ESWC), Heraklion, Greece; (Best Paper Award), 2009/06 (pdf)

• Linked Data for Building a Map of Researchers (Scripting Challenge Submission)
  Olaf Hartig, Hannes Mühleisen, Johann-Christoph Freytag
  Proceedings of the 5th Workshop on Scripting for the Semantic Web (SFSW) at the European Semantic Web Conference (ESWC), Heraklion, Greece, 2009/06 (pdf)

• Provenance Information in the Web of Data
  Olaf Hartig
  Proceedings of the Linked Data on the Web (LDOW'09) Workshop at the World Wide Web Conference (WWW), Madrid, Spain, 2009/04 (pdf)

2008

• Designing Component-Based Semantic Web Applications with DESWAP
  Olaf Hartig, Martin Kost, Johann-Christoph Freytag
  Proceedings of the Poster and Demonstration Session at the 7th International Semantic Web Conference (ISWC'08), Karlsruhe, Germany, 2008/10 (pdf)

• Automatic Component Selection with Semantic Technologies
  Olaf Hartig, Martin Kost, Johann-Christoph Freytag
  Proceedings of the 4th International Workshop on Semantic Web Enabled Software Engineering (SWESE) at ISWC, Karlsruhe, Germany, 2008/10 (pdf)

• Trustworthiness of Data on the Web
  Olaf Hartig
  Proceedings of the STI Berlin & CSW PhD Workshop, Berlin, Germany, 2008/09 (pdf)

2007

• The SPARQL Query Graph Model for Query Optimization (Abstract)
  Olaf Hartig, Ralf Heese
  Proceedings of the 4th European Semantic Web Conference, Autria, 2007/06

Studentische Arbeiten

1. "Qualitätsmerkmale von Linked Data-veröffentlichenden Datenquellen" (Diplomarbeit) Annika Flemming, abgeschlossen
2. "Herkunftsbasierte Bestimmung der Vertrauenswürdigkeit von Web-Daten" (Diplomarbeit) Thomas Riegmann, abgeschlossen
3. "Caching für verweisbasierte Anfragebearbeitung im Web of Linked Data" (Diplomarbeit) Jan Wehrs, abgeschlossen
4. "Effiziente Verwaltung der Vertrauensbewertungen von Web-Daten" (Studienarbeit) Robert Nagel, abgeschlossen
5. "Ermittlung und Berücksichtigung der Vertrauenswürdigkeit von gemeinschaftlich erzeugten Aussagen in Semantic Web Anwendungen" (Diplomarbeit) Heiko Müller, abgeschlossen
6. "Visualisierung von OWL-S-Prozessmodellen" (Studienarbeit) Hermann Schwarz, abgeschlossen
7. "Intelligent Search for Software and Supported Functionalities in DESWAP" (Masterarbeit) Carmen Garcia Valero, abgeschlossen

Programmkomitees

• 12th International Conference on Web Engineering (ICWE), Juli 2012, Berlin, Deutschland
• 1st Workshop on Methods for Establishing Trust with Open Data (METHOD), Juli 2012, Izmir, Türkei
• 4th International Provenance and Annotation Workshop (IPAW), Juni 2012, Santa Barbara, Californien, USA
• 9th Extended Semantic Web Conference (ESWC), Mai 2012, Heraklion, Griechenland
• 3rd International Workshop on the Role of Semantic Web in Provenance Management (SWPM), Mai 2012, Heraklion, Griechenland
• 5th Linked Data on the Web Workshop (LDOW), April 2012, Lyon, Frankreich
• 21th International World Wide Web Conference (WWW), April 2012, Lyon, Frankreich
• 16th International Conference on Information Quality (ICIQ), November 2011, Adelaide, Australien
• 4th Social Data on the Web Workshop (SDoW), Oktober 2011, Bonn, Deutschland
• 7th International Conference on Semantic Systems (I-Semantics), September 2011, Graz, Österreich
• 2nd International Workshop on Traceability and Compliance of Semi-Structured Processes (TC4SP), August 2011, Clermont-Ferrand, Frankreich
• 22nd International Joint Conference on Artificial Intelligence (IJCAI), Juli 2011, Barcelona, Spanien
• 11h International Conference on Web Engineering (ICWE), Juni 2011, Paphos, Zypern   (Best Review Award winner)
• 8th Extended Semantic Web Conference (ESWC), Linked Open Data Track, Juni 2011, Heraklion, Griechenland
• 4th Linked Data on the Web Workshop (LDOW), März 2011, Hyderabad, Indien
• IUI Workshop on Context-aware Retrieval and Recommendation (CaRR), Februar 2011, Palo Alto, USA
• 9th International Semantic Web Conference (ISWC), Poster and Demo track, November 2010, Shanghai, China
• 3rd Social Data on the Web Workshop (SDoW), November 2010, Shanghai, China
• 2nd International Workshop on the Role of Semantic Web in Provenance Management (SWPM), November 2010, Shanghai, China
• 15th International Conference on Information Quality (ICIQ), November 2010, Little Rock, Arkansas, USA
• 1st International Workshop on Traceability and Compliance of Semi-Structured Processes (TC4SP), September 2010, Hoboken, NJ, USA
• Triplification Challenge 2010 at I-Semantics, September 2010, Graz, Österreich
• 6th International Conference on Semantic Systems (I-Semantics), September 2010, Graz, Österreich
• 2nd Conference on Semantic Technology and Knowledge Engineering (STAKE), Juli 2010, Kuching, Sarawak, Malaysia
• 3rd International Provenance and Annotation Workshop (IPAW), Juni 2010, Troy, New York, USA
• 7th Extended Semantic Web Conference (ESWC), In Use Track, Juni 2010, Heraklion, Griechenland
• 2nd Workshop on Trust and Privacy on the Social and Semantic Web (SPOT), Juni 2010, Heraklion, Griechenland
• 3rd Linked Data on the Web Workshop (LDOW), April 2010, Raleigh, North Carolina, USA
• 2nd Social Data on the Web Workshop (SDoW), Oktober 2009, Washington DC, USA
• 5th International Conference on Semantic Systems (I-Semantics), September 2009, Graz, Österreich
• 2nd Linked Data on the Web Workshop (LDOW), April 2009, Madrid, Spanien

Weitere Aktivitäten

• Invited Expert der W3C Provenance Working Group
• Invited Expert der W3C Provenance Incubator Group
• Organisator des "3rd International Workshop on Consuming Linked Data (COLD)" at the 11th International Semantic Web Conference (ISWC), November 2012, Boston, USA
• Organisator des "2nd Linked Data-a-thon" bei der 10. International Semantic Web Conference (ISWC), Oktober 2011, Bonn, Deutschland
• Organisator des "2nd International Workshop on Consuming Linked Data (COLD)" bei der 10. International Semantic Web Conference (ISWC), Oktober 2011, Bonn, Deutschland
• Organisator des "1st International Workshop on Consuming Linked Data (COLD)" bei der 9. International Semantic Web Conference (ISWC), November 2010, Shanghai, China
• Dozent bei der Indian-Summer School on Linked Data, September 2011, Leipzig, Germany
• Präsentation des Tutorials "An Introduction to SPARQL and Queries over Linked Data" bei der 12. International Conference on Web Engineering (ICWE), July 2012, Berlin, Deutschland
• Präsentation des Tutorials "How to Consume Linked Data on the Web" bei der 19. International World Wide Web Conference (WWW), April 2010, Raleigh, NC, USA
• Präsentation des Tutorials "How to Consume Linked Data on the Web" bei der 8. International Semantic Web Conference (ISWC), Oktober 2009, Washington DC, USA
• Präsentation des Tutorials "How to Publish Linked Data on the Web" bei der 7. International Semantic Web Conference (ISWC), October 2008, Karlsruhe, Deutschland
• Semantic Technologies Koordinator der "9th Extended Semantic Web Conference (ESWC)", Mai 2012, Heraklion, Griechenland
• Forschungsprojekt bei Talis in Birmingham, Vereinigtes Königreich, Sommer 2010
• Teilnahme am Dagstuhl-Seminar zu "Principles of Provenance", Februar 2012, Schloss Dagstuhl, Deutschland
• Teilnahme am Dagstuhl-Seminar zu "Semantic Data Management", April 2012, Schloss Dagstuhl, Deutschland