Gerhard Weikum (auth.), Hans-Jörg Schek, Gustavo Alonso,'s Advances in Database Technology — EDBT'98: 6th International PDF

By Gerhard Weikum (auth.), Hans-Jörg Schek, Gustavo Alonso, Felix Saltor, Isidro Ramos (eds.)

This ebook constitutes the refereed lawsuits of the sixth overseas convention on Extending Database expertise, EDBT '98, held in Valencia, Spain, in March 1998. The 32 revised complete papers offered including one invited keynote have been chosen from a complete of 191 submissions. The ebook is split in sections on similarity seek and indexing, question optimization on the net, Algorithms for info mining, modelling in OLAP, question processing and garage administration, aggregation and precis information, object-oriented and lively databases, view upkeep and integrity, databases and the net, workflow and clinical databases.

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For such databases, which typically contain N points on the plane, several external-memory data structures have been developed. Those data structures are characterized by an I/O complexity for search and update operations comparable to the internal memory results 11, 14, 19, 21. Compared to the "point database" case, much less work has been carried out for the so called "segment databases" which represent a more general case. A segment database stores in secondary storage N non-crossing but possibly touching plane segments (for brevity, called NCT segments).

S1GIR, pages 77-86, 1989. 24. Wagner G. A database needs two kinds of negation. In Proc. MFDB, pages 357-371, 1991. 25. Wagner G. Ex contradictione nihil sequitur. In Proc. IJCAL pages 538-543, 1991. 26. M. Y. On modeling information retrieval with probabilistic inference. ACM TOIS, 13(1):38-68, 1995. 27. H. Towards automating content-based video indexing and retrieval. In Proc. Multi-Media Modeling, 1993. de Extended Abstract We are witnessing the proliferation of the global information society with a sheer explosion of information services on a world-spanning network.

Thus, we need an approach that allows for a certain kind of abstraction from document structure. The approach presented in 18 combines the two ideas of inconsistency handling and structural abstraction. For the latter, the concept of contexts is introduced: Theoretically, a context corresponds to a part of one or more aggregated documents which can be viewed by a user in a meaningful way. (Practically, the set of contexts considered as possible answers for a query is restricted in order to reduce the computational time for computing the answers).

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