The Semanic Web: Research and Applications: 8th Extended by Carlos Buil-Aranda, Marcelo Arenas, Oscar Corcho (auth.),

By Carlos Buil-Aranda, Marcelo Arenas, Oscar Corcho (auth.), Grigoris Antoniou, Marko Grobelnik, Elena Simperl, Bijan Parsia, Dimitris Plexousakis, Pieter De Leenheer, Jeff Pan (eds.)

The books (LNCS 6643 and 6644) represent the refereed court cases of the eighth ecu Semantic internet convention, ESWC 2011, held in Heraklion, Crete, Greece, in May/June 2011. The fifty seven revised complete papers of the learn tune offered including 7 PhD symposium papers and 14 demo papers have been conscientiously reviewed and chosen from 291 submissions. The papers are prepared in topical sections on electronic libraries song; inductive and probabilistic ways tune; associated open information tune; cellular net song; typical language processing music; ontologies tune; and reasoning song (part I); semantic facts administration music; semantic net in use song; sensor internet song; software program, providers, approaches and cloud computing music; social net and internet technology tune; demo song, PhD symposium (part II).

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Additional info for The Semanic Web: Research and Applications: 8th Extended Semantic Web Conference, ESWC 2011, Heraklion, Crete, Greece, May 29 – June 2, 2011, Proceedings, Part II

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440,296ms. Q2 64,179ms. 64,179ms. 10+ min. 10+ min. 10+ min. Q3 134,324ms. 134,324ms. 10+ min. 10+ min. 10+ min. Q4 152,559ms. 136,482ms. 10+ min. 10+ min. 10+ min. Q5 146,575ms. 146,575ms. 10+ min. 10+ min. 10+ min. Q6 322,792ms. 79,178ms. 10+ min. 10+ min. 10+ min. Q7 350,554ms. 83,153ms. 10+ min. 10+ min. 10+ min. A first clear advantage of our implementation is the ability to use asynchronous calls facilitated by the use of indirect access mode, what means that we do not get time out in any of the queries.

The implemented optimizations are less noticeable when the amount of transferred data is fewer. It is possible to observe three different sets of results from this preliminary evaluation. 1 are not applicable. The second query group (Q4) represents the class of queries that can be optimized using our approach, but where the difference is not too relevant, because the less amount of transferred data. The last group of queries (Q6–Q7) shows a clear optimization when using the well-designed patterns rewriting rules.

In the following section, we show that the use of these rules can have a considerable impact in the cost of evaluating graph patterns. 5 Implementation of SPARQL-DQP and Well-Designed Patterns Optimization In this section, we describe how we implemented and evaluated the optimization techniques presented in the previous section. 1 federated queries. 1 in SPARQL-DQP [5], together with a bottom up algorithm for checking the condition of being welldesigned. SPARQL-DQP is a query evaluation system built on top of OGSA-DAI [3] and OGSA-DQP [10].

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