Databases, Information Systems, and Peer-to-Peer Computing: by Gianluca Moro, Sonia Bergamaschi, Sam Joseph, Jean-Henry

By Gianluca Moro, Sonia Bergamaschi, Sam Joseph, Jean-Henry Morin, Aris M. Ouksel

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Extra resources for Databases, Information Systems, and Peer-to-Peer Computing: International Workshops, DBISP2P 2005 2006, Trondheim, Norway, August 28-29, 2006, Revised ... Applications, incl. Internet Web, and HCI)

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SIGMOD Conference, ACM Press (1994) 348–358 22. : Integrating information by outerjoins and full disjunctions. In: PODS, ACM Press (1996) 238–248 23. : Declarative data merging with conflict resolution. : IQ, MIT (2002) 212–224 24. : Learning object identification rules for information integration. Inf. Syst. 26 (2001) 607–633 25. : Eliminating fuzzy duplicates in data warehouses. In: VLDB. (2002) 586–597 26. : Robust and efficient fuzzy match for online data cleaning. : SIGMOD Conference, ACM (2003) 313–324 27.

To get the baseline for our experiments, we measured 4 most popular existing selection methods: two language model based methods from [26,21], CORI [4] and GlOSS [12]. Our results showed that Language model based methods are constantly more effective and method by Si, Callan and others [21] is the best. GlOSS appeared to be the worst. We can observe the performance of these methods and our approach, which uses the combination of Robertsons expansion with Tao and Zhais query modeling, in Table 2.

The non-classified documents were randomly distributed among all databases. Each classified document was assigned to two collections from the same topic. For example, for the topic “American music” we had the subset of 15 small collections and all classified documents were replicated twice in it. The topics with the numbers of corresponding collections are summarized in the Tab. 1, each collection was managed by one dedicated peer. Assuming that the search in our Table 1. Topic-oriented experimental collections N Topic Number of collections 1 Health and medicine 2 Nature and ecology 3 Historic preservation 4 American music 15 10 10 15 system should be topic-oriented as well as crawling, we selected the set of the 25 out of 100 title queries from the topic distillation task for the TREC 2002 and 2003 Web Track.

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