I moved to the university of Passau. This Web page will only be infrequently updated.
Recent previous courses:
See here for a more complete list of previous courses.
Research Interests:
- Efficient and Effective Search on Structured, Semistructured, and Unstructured Data
- Extraction, Mining, and Retrieval in Distributed Knowledge Sources
- Large-scale, Long-term Web Archiving
- Interactive Information Retrieval and User Interfaces
Group poster from the last advisory board visit (PDF, 454K)
Selected Recent Publications:
- Tom Crecelius, Ralf Schenkel: Pay-as-you-go Maintenance of Precomputed Nearest Neighbors in Large Graphs. In: Proceedings of the 21st ACM International Conference on Information and Knowledge Management (CIKM 2012), Maui, USA, 2012.
- Avishek Anand, Srikanta Bedathur, Klaus Berberich, Ralf Schenkel: Index Maintenance for Time-Travel Text Search. In: Proceedings of the 35th Annual International ACM SIGIR Conference on Research & Development on Information Retrieval (SIGIR 2012), Portland, USA, 2012.
- Andreas Broschart, Ralf Schenkel: High-Performance Processing of Text Queries with Tunable Pruned Term and Term Pair Indexes. Accepted for ACM Transactions on Information Systems.
- Steffen Metzger, Shady Elbassuoni, Katja Hose, Ralf Schenkel: S3K: Seeking Statement-Supporting top-K Witnesses. In: 20th ACM Conference on Information and Knowledge Management (CIKM 2011), Glasgow, UK, 2011.
- Andreas Schwarte, Peter Haase, Katja Hose, Ralf Schenkel, Michael Schmidt: FedX: Optimization Techniques for Federated Query Processing on Linked Data . In: 10th International Semantic Web Conference (ISWC 2011), Bonn, Germany, 2011.
- Avishek Anand, Srikanta Bedathur, Klaus Berberich, Ralf Schenkel: Temporal Index Sharding for Space-Time Efficiency in Archive Search. In: Proceedings of the 34th Annual International ACM SIGIR Conference on Research & Development on Information Retrieval (SIGIR 2011), Beijing, China, 2011.
- Andreas Schwarte, Peter Haase, Katja Hose, Ralf Schenkel, Michael Schmidt: FedX: A Federation Layer for Distributed Query Processing on Linked Open Data . In: 8th Extended Semantic Web Conference (ESWC 2011), Heraklion, Greece, 2011.
- Avishek Anand, Srikanta Bedathur, Klaus Berberich, Ralf Schenkel: Efficient Temporal Keyword Queries over Versioned Texts. In: 19th International Conference on Knowledge and Iormation Management (CIKM 2010), Toronto, Canada, 2010.
- Shady Elbassuoni, Katja Hose, Steffen Metzger, Ralf Schenkel: ROXXI: Reviving witness dOcuments to eXplore eXtracted Information (demo). In: 36th International Conference on Very Large Data Bases (VLDB 2010), Singapore, 2010.
- Ralf Schenkel: Temporal Shingling for Version Identification in Web Archives. In: 32nd European Conference on Information Retrieval (ECIR 2010), Milton Keynes, UK, 2010.
- Shady Elbassuoni, Maya Ramanath, Ralf Schenkel, Marcin Sydow, and Gerhard Weikum: Language-model-based Ranking for Queries on RDF-Graphs. In: 18th ACM Conference on Information and Knowledge Management (CIKM 2009), Hongkong, China, 2009.
- Michal Shmueli-Scheuer, Chen Li, Yosi Mass, Haggai Roitman, Ralf Schenkel, and Gerhard Weikum: Best Effort Top-K Query Processing Under Budgetary Constraints In: Proceedings of the 25th IEEE International Conference on Data Engineering (ICDE 2009), Shanghai, China, 2009.
- Thomas Neumann, Matthias Bender, Sebastian Michel, Ralf Schenkel, Peter Triantafillou, and Gerhard Weikum: Distributed Top-k aggregation queries at large In: Distributed and Parallel Databases 26 (1): 3-27, 2009.
- Avishek Anand, Srikanta Bedathur, Klaus Berberich, Ralf Schenkel, and Christos Tryfonopoulos: EverLast: A Distributed Architecture for Preserving the Web In: Proceedings of the Joint Conference on Digital Libraries (JCDL 2009), Austin, Texas, 2009.
- Ralf Schenkel, Tom Crecelius, Mouna Kacimi, Sebastian Michel, Thomas Neumann, Josiane Xavier Parreira, and Gerhard Weikum: Efficient Top-k Querying over Social-Tagging Networks In: Proceedings of the 31st Annual International ACM SIGIR Conference on Research & Development on Information Retrieval (SIGIR 2008), Singapore, Singapore, 2008.
- Martin Theobald, Holger Bast, Debapriyo Majumdar, Ralf Schenkel, and Gerhard Weikum: TopX: Efficient and Versatile Top-k Query Processing for Semistructured Data In: The VLDB Journal 17 (2): 81-115, 2008.
- Ralf Schenkel, Andreas Broschart, Seungwon Hwang, Martin Theobald, and Gerhard Weikum: Efficient Text Proximity Search In: 14th String Processing and Information Retrieval Symposium (SPIRE 2007), Santiago, Chile, 2007.
My publications at the MPI publications server (complete), at DBLP, at Google Scholar, at ACM
Summary of my dissertation
Selected Activities:
- Co-chair of the Initiative for the Evaluation of XML Retrieval (INEX) (with Shlomo Geva and Jaap Kamps)
- Co-chair of the 1st Joint International Workshop on Entity-oriented and Semantic Search (JIWES) (in conjunction with SIGIR 2012), August 16, 2012, Portland, USA (with Krisztian Balog, David Carmel, Arjen de Vries, Daniel M. Herzig, Peter Mika, Haggai Roitman, Pavel Serdyukov, Thanh Tran Duc)
- Co-chair of the Fachgruppentreffen DB+IR (in conjunction with EDBT 2012), March 26, 2012, Berlin, Germany (with Wolf-Tilo Balke)
- Co-chair of the Workshop on Search and Mining Entity-Relationship Data (SMER 2011) (in conjunction with CIKM 2011), October 28, 2011, Glasgow, UK (with Haggai Roitman and Marko Grobelnik)
- Co-chair of the Third Workshop on Exploiting Semantic Annotations in Information Retrieval (ESAIR 2010) (in conjunction with CIKM 2010), October 2010, Toronto, Canada (with Jaap Kamps and Jussi Karlgren)
- Organizer of Herbstschule Information Retrieval 2010 of the GI-Fachgruppe Information Retrieval, September 26 - October 1, 2010, Schloß Dagstuhl, Germany
- Co-chair of the Adhoc Track at the Initiative for the Evaluation of XML Retrieval (INEX 2010) (with Shlomo Geva, Jaap Kamps, Martin Theobald, James A. Thom, Andrew Trotman) and creator of the INEX 2009 annotated Wikipedia XML collection
- Managing Editor of Datenbank-Spektrum (with Theo Härder, 2011-)
- Member of the Editorial Board of Distributed and Parallel Databases (2010-)
- Co-chair of the 2nd International Workshop on Modeling, Managing, and Mining of Evolving Social Networks (M3SN) (in conjunction with ICDE 2010), March 6, 2010, Long Beach, California, USA (with Srikanta Bedathur and Akshay Java)
- Co-chair of the Efficiency Track at the Initiative for the Evaluation of XML Retrieval (INEX 2008 & 2009) (with Martin Theobald)
Selected Recent Program Committee memberships:
- International Conference on Extending Database Technology (EDBT) 2014, 2012 (demo), 2009 (demo), 2008
- International ACM SIGIR Conference on Research & Development on Information Retrieval (SIGIR) 2013, 2012, 2011, 2010, 2008, 2007
- International ACM SIGKDD Conference on Knowledge Discovery and Data Mining (KDD) 2013, 2010
- International World Wide Web Conference (WWW) 2013, 2012, 2010
- ACM Conference on Information and Knowledge Management (CIKM) 2013, 2012, 2011, 2005
- European Conference on Information Retrieval (ECIR) 2013, 2012, 2011, 2010, 2009, 2008
- International Conference on Web Information System Engineering (WISE) 2013, 2012, 2011, 2010
- International Conference on Data Engineering (ICDE) 2012, 2010, 2009
- IEEE/WIC/ACM International Joint Conference on Web Intelligence (WI) 2011, 2010
- ACM International Conference on Web Search and Data Mining (WSDM) 2011, 2010
- International Conference on COOPERATIVE INFORMATION SYSTEMS (CoopIS) 2013, 2012, 2011, 2010, 2009, 2008
- International Conference on Very Large Data Bases (VLDB) 2010, 2008, 2007 (demo), 2006
- ACM SIGMOD International Conference on Management of Data (SIGMOD) 2010, 2009 (demo)
- GI-Fachtagung für Datenbanksysteme in Business, Technologie und Web (BTW) 2009, 2007, 2005
Selected Talks:
- Large-Scale Semantic Data Management. Overview talk on recent work in my group
- Semistructured Data Search Evaluation. PROMISE Winter School 2013, Bressanone, Italy, February 6, 2013.
- Pay-as-you-go Maintenance for Precomputed Nearest Neighbor Lists in Large Graphs. 21st ACM International Conference on Information and Knowledge Management (CIKM 2012), Maui, Hawaii, October 31, 2012.
- Efficiency Issues inInformation Retrieval. Herbstschule der GI-Fachgruppe Information Retrieval, Schloss Dagstuhl, October 2, 2012.
- Database Techniques for Linked Data Management. Tutorial at ACM SIGMOD Conference, Scottsdale, Arizona, May 25, 2012 (with Andreas Harth and Katja Hose)
- Towards Benefit-Based RDF Source Selection for Linked Data. 4th International Workshop on Semantic Web Information Management (SWIM 2012), Scottsdale, Arizona, May 20, 2012.
- Database foundations for scalable RDF processing. Reasoning Web 2011 Summer School, Galway, Ireland, August 23-27, 2011 (with Katja Hose, Martin Theobald, Gerhard Weikum)
- Semantic Knowledge Bases from Web Sources. 22nd International Joint Conference on Artificial Intelligence (IJCAI 2011), Barcelona, Spain, July 18, 2011 (with Hady Lauw, Fabian Suchanek, Martin Theobald, Gerhard Weikum)
- Efficient Information Retrieval. Invited Talk, Tblisi State University, May 5, 2011
- Harvesting Knowledge from Web Data and Text. 19th Int. Conference on Information and Knowledge Management (CIKM 2010), Toronto, Canada, October 26, 2010 (with Hady Lauw, Fabian Suchanek, Martin Theobald, Gerhard Weikum)
- Temporal Shingling for Version Identification in Web Archives. 32nd European Conference on Information Retrieval (ECIR 2010), Milton Keynes, UK, March 31, 2010.
- Knowledge-based technologies in the WisNetGrid project (in German). 3rd D-Grid All-Hands-Meeting, Dresden, Germany, March 23, 2010.
- Efficient Information Retrieval. Antrittsvorlesung, Saarland University, March 19, 2010.
- DIVERSUM: Towards Diversified Summarization of Entities in Knowledge Graphs. 1st Int. Workshop Data Engineering meets the Semantic Web in conjunction with ICDE 2010, Long Beach, CA, March 6, 2010.
- Group overview slides. MMCI Retreat, Braunshausen, February 21, 2010.
- Efficient and Effective Search in Social Networks,Perspektivenvorlesung WS 2008/2009 (I have given similar talks at various other events)
- Efficiency Issues in Information Retrieval. Herbstschule der GI-Fachgruppe Information Retrieval, Schloss Dagstuhl, October 1, 2008.
- "IP" is not always "InternetProtocol". Dagstuhl Perspectives Workshop 08393 "Virtual games, interactive hosted services and user-generated content in Web 2.0",Schloss Dagstuhl, Germany, September 25, 2008.
- Efficient Top-k Querying over Social Tagging Networks. 31st Annual International ACM SIGIR Conference on Research & Development on Information Retrieval (SIGIR 2008), Singapore, July 23, 2008.
- Relevance Feedback in the TopX Search Engine. Dagstuhl Seminar 08111 "Ranked XML Querying",Schloss Dagstuhl, Germany, March 13, 2008.
- YAWN:A semantically annotated Wikipedia XML Corpus. 12th GI Conference on Databases in Business, Technology and Web (BTW 2007), Aachen,Germany, March 8th, 2007.
- Structural Feedback forKeyword-Based XML Retrieval. 28th European Conference on IRResearch (ECIR 2006), London, UK, April 11th, 2006.
- Feedback-Driven Structural Query Expansion for Ranked Retrieval of XML Data. 10thInternational Conference on Extending Database Technology (EDBT 2006),Munich, Germany, March 28th, 2006.
- The SphereSearch Engine for Unified Ranked Retrieval of Heterogeneous XMLand Web Documents . 31st International Conference on VeryLarge Data Bases (VLDB 2005), Trondheim, Norway, September 1st, 2005.
- Efficient Creation and Incremental Maintenance of the HOPI Index for Complex XML DocumentCollections. 21st International Conference on DataEngineering (ICDE 2005), Tokyo, Japan, April 6th, 2005.
- Integrating Snapshot Isolation Into Transactional Federations. Presented at 5th IFCIS International Conference on Cooperative Information Systems (CoopIS2000), Eilat, Israel, September 6-8, 2000.
Slides of talks not listed here available on request.
To contact me:
Passau University
Lehrstuhl für Informationsmanagement
Innstraße 43
94032 Passau
Germany
| Phone: +49 851 509-3234
Fax: TBA
Email: ralf.schenkel@uni-passau.de | |
Other Activities:
Impressions from SIGMOD 2007 in Beijing(Nokia N95)
Impressions from EDBT2004 in Heraklion (Canon G3)
Impressionsfrom SSDBM 2004 on Santorini (Canon G3)
To the homepage of MPI department 5
