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Wednesday, June 23, 2010 
02:00 PM - 03:00 PM
| Level: | Technical - Intermediate
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| Location: | Yosemite A |
Reason-able views represent a sort of search engines, or indices that allow efficient access to parts of the Linking Open Data (LOD) cloud. Linked Data Semantic Repository (http://ldsr.ontotex.com) combines several of the central datasets of LOD (e.g. DBPedia, Freebase, Geonames) in a repository containing more than 1B explicit statements. After inference, there are 4B different retrievable statements describing about 250M resources. For some entities LDSR contains fairly big volumes of data (e.g. 1380 statements for San Francisco), thus, a good visualisation facility need to find a way to present a “good” fraction of the information. We have developed a mechanism, called RDF priming, for ranking the importance of the information in an RDF graph with respect to both its topology (e.g. PageRank) and the relevance to specific query and user context. We present the benefits of RDF priming for LDSR exploration, along with the technical solution allowing us to perform ranking in a graph of several billion statements in real time. We apply the CUDA architecture that allows using NVIDIA Graphical Processing Units (GPU) for massively parallel computations. In this context, a CUDA card priced around $400 performs several times faster than a dual-CPU server worth $4000.
Atanas Kiryakov is the founder and CEO of Ontotext AD. Ontotext is a leading provider of core semantic technology, distinctive for its performance, scale, and compliance with open standards. Kiryakov joined Sirma as a software engineer in 1993 and later on became partner and member of the board. In year 2000 he found Ontotext lab. He led Ontotext in research projects with total budget above 100 MEuro that allowed it to invest more than 150 man-years in product development. In 2008 Kiryakov finalized an investment deal for Ontotext for 2.5M EURO, under which the VC fund NEVEQ acquired a minority share.
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