Open Data Initiatives at HPI

This page gathers open-data-related activities at HPI, in particular in the area of linked open data and the semantic web. Contributing groups are

Internet technologies and systems (Christoph Meinel and Harald Sack)
Information systems (Felix Naumann)

Research Projects

GovWILD
GovWILD gathers and integrates government data from diverse government data sources, presents them in a Web interface and provides the data for download.
Received the IBM Scalable Data Analytics Award
ProLOD
Profiler for Linked Open Data (ProLOD) is a Web-based tool to perform data profiling tasks on datasets such as DBpedia. (NTII 2010 paper)
Yovisto
Yovisto is a semantic 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) and Linked Open Data resources such as DBpedia. In difference to traditional video search engines, Yovisto enables pinpoint access within video data by providing fine-granular, time-dependent semantic metadata being published as Linked Open Data (SAMT 2010 paper / SemSearch 2010 paper).
Mediaglobe
Cultural Memory provides an ever-increasing amount of information. Only a negligible small portion of this content is already accessable in the World Wide Web. Mediaglobe is a funded by the Federal Ministry of Economics and Technology within the context of the THESEUS research program 'New technologies for the internet of services' and aims to take media archives into the digital future providing availability and usability for the growing stock of audiovisual documents concerning German contemporary history. Mediaglobe offers state-of-the-art services for multimedia analysis and semantic multimedia search based on mappings to Linked Open Data resources on the web.
Stratosphere
The DFG Research Unit (Forschergruppe) is developing a cloud-based data management system. One of the use cases is to query and cleanse linked open data.
iPopulator
With iPopulator, we have introduced a system that automatically populates infoboxes of Wikipedia articles by extracting attribute values from the article's text. In contrast to prior work, iPopulator detects and exploits the structure of attribute values to independently extract value parts. We have published a set of extracted facts from Wikipedia. (CIKM 2010 paper / technical report)

Data Sets

GovWILD data set (JSON, SQL, RDF)
iPopulator: Extracted facts from Wikipedia (CSV, N3)

Publications

Abedjan, Z. & Naumann, F., 2014. Amending RDF Entities with New Facts. In Know@LOD Workshop in conjunction with ESWC. Creete, Greece.

[ BibTeX ]

Abedjan, Z., Gruetze, T., Jentzsch, A. & Naumann, F., 2014. Profiling and Mining RDF Data with ProLOD++. In Proceedings of the IEEE International Conference on Data Engineering (ICDE), Demo. Chicago, IL.

[ BibTeX ]

Langer, P., Schulze, P., George, S., Kohnen, M., Metzke, T., Abedjan, Z. & Kasneci, G., 2014. Assigning Global Relevance Scores to DBpedia Facts. In International Workshop on Data Engineering meets the Semantic Web (DESWeb). Chicago, IL.

[ BibTeX ]

Abedjan, Z. & Naumann, F., 2013. Synonym Analysis for Predicate Expansion. In Proceedings of the Extended Semantic Web Conference (ESWC), Montpellier, France.

[ BibTeX ]

Lorey, J. & Naumann, F., 2013. Detecting SPARQL Query Templates for Data Prefetching. In Proceedings of the 10th Extended Semantic Web Conference (ESWC). Montpellier, France.

[ BibTeX ]

Lorey, J. & Naumann, F., 2013. Caching and Prefetching Strategies for SPARQL Queries. In Proceedings of the 3rd International Workshop on Usage Analysis and the Web of Data (USEWOD). Montpellier, France.

[ BibTeX ]

Abedjan, Z. & Naumann, F., 2013. Improving RDF Data through Association Rule Mining. Datenbank-Spektrum (Special Issue on RDF Data Management), 13(2), Bll 111–120.

[ BibTeX ]

Lorey, J. & Naumann, F., 2013. Caching and Prefetching Strategies for SPARQL Queries. In ESWC 2013 Satellite Events -- Revised Selected Papers. Montpellier, France.

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Lorey, J., 2013. SPARQL Endpoint Metrics for Quality-Aware Linked Data Consumption. In Proceedings of the 15th International Conference on Information Integration and Web-based Applications & Services (iiWAS ’13). Vienna, Austria.

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Lorey, J., 2013. Storing and Provisioning Linked Data as a Service. In Proceedings of the 10th Extended Semantic Web Conference (ESWC). Montpellier, France.

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Böhm, C., Kasneci, G. & Naumann, F., 2012. Latent Topics in Graph-Structured Data. In Proceedings of the Conference on Information and Knowledge Management (CIKM).

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Böhm, C., Freitag, M., Heise, A., Lehmann, C., Mascher, A., Naumann, F., Hernandez, M., Ercegovac, V. & Haase, P., 2012. GovWILD: Integrating Open Government Data for Transparency (demo). In Proceedings of the International World Wide Web Conference (WWW). Lyon, France.

[ BibTeX ]

Abedjan, Z., Lorey, J. & Naumann, F., 2012. Reconciling Ontologies and the Web of Data. In Proceedings of the 21st International Conference on Information and Knowledge Management (CIKM). Maui, Hawaii, USA, , Bll 1532–1536.

[ BibTeX ]

Gruetze, T., Böhm, C. & Naumann, F., 2012. Holistic and Scalable Ontology Alignment for Linked Open Data. In Proceedings of the 5th Linked Data on the Web (LDOW) Workshop at the 21th International World Wide Web Conference (WWW). Lyon, France.

[ BibTeX ]

Böhm, C., de Melo, G., Naumann, F. & Weikum, G., 2012. LINDA: Distributed Web-of-Data-Scale Entity Matching. In Proceedings of the International Conference on Information and Knowledge Management (CIKM), Maui, Hawaii.

[ BibTeX ]

Abedjan, Z. & Naumann, F., 2011. Context and Target Configurations for Mining RDF Data. In International Workshop on Search & Mining Entity-Relationship Data (SMER), Glasgow, UK.

[ BibTeX ]

Lorey, J., Abedjan, Z., Naumann, F. & Böhm, C., 2011. RDF Ontology (Re-)Engineering through Large-scale Data Mining. In Billion Triples Challenge (BTC) at the 10th International Semantic Web Conference (ISWC). Koblenz, Germany.

[ BibTeX ]

Böhm, C., Lorey, J. & Naumann, F., 2011. Creating voiD Descriptions for Web-scale Data. Journal of Web Semantics: Science, Services and Agents on the World Wide Web, 9(3), Bll 339–345.

[ BibTeX ]

Lange, D., Böhm, C. & Naumann, F., 2010. Extracting structured information from Wikipedia articles to populate infoboxes, Hasso-Plattner-Institut für Softwaresystemtechnik an der Universität Potsdam.

[ BibTeX ]

Böhm, C., Naumann, F., Abedjan, Z., Fenz, D., Gruetze, T., Hefenbrock, D., Pohl, M. & Sonnabend, D., 2010. Profiling linked open data with ProLOD. In Workshops Proceedings of the 26th International Conference on Data Engineering (ICDE), Long Beach, CA., , Bll 175–178.

[ BibTeX ]

Böhm, C., Naumann, F., Freitag, M., George, S., Höfler, N., Köppelmann, M., Lehmann, C., Mascher, A. & Schmidt, T., 2010. Linking open government data: what journalists wish they had known. In Proceedings the 6th International Conference on Semantic Systems (I-SEMANTICS), Graz, Austria. Available at: http://portal.acm.org/citation.cfm?id=1839751.

[ BibTeX ]

Böhm, C., Lorey, J., Fenz, D., Kny, E., Pohl, M. & Naumann, F., 2010. Creating voiD Descriptions for Web-Scale Data. In Billion Triples Challenge (BTC) at the 9th International Semantic Web Conference (ISWC). Shanghai, China.

[ BibTeX ]

Lange, D., Böhm, C. & Naumann, F., 2010. Extracting structured information from Wikipedia articles to populate infoboxes. In Proceedings of the 19th ACM Conference on Information and Knowledge Management (CIKM). Toronto, Canada, , Bll 1661–1664.

[ BibTeX ]

Böhm, C., Groth, P. & Leser, U., 2009. Graph-Based Ontology Construction from Heterogeneous Evidences. In Proceedings of the International Semantic Web Conference (ISWC)., , Bll 91–96.

[ BibTeX ]

Courses

Bachelor project: A Cloud Platform for On-Demand Access to Open Data
Master seminar: Large-Scale Data Analysis in the Cloud (see also Billion Triple Challenge 2010 paper and website)
Bachelor project: Midas: Extreme Web Data Integration for Government Data (see GovWILD project)
Master Seminar: Linked Data Profiling (see NTII 2010 paper)
Master Seminar: Large Scale Processing for Semantic Web Technologies (WS 2010/11)
Bachelor Seminar: Linked Open Data Application Engineering (WS 2009/10)
Master Seminar: Scalable Data Analysis Algorithms using DBpedia data sets (WS 2011/12)

Master's Theses

Learning to Extract Structured Information from Wikipedia Articles to Populate Infoboxes (Dustin Lange, 2009) (see also CIKM 2010 paper and tech report)
Wikipedia cross-lingual Concept Identification and Infobox Alignment (Daniel Rinser, 2010)
Strategies for structure-based rewriting of SPARQL queries for data prefetching (Armin Zamani, 2013)