Πλοήγηση ανά Συγγραφέας "Vasileiou, Ioannis"
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Τεκμήριο Coverage-Based Summaries for RDF KBs.(ΕΛ.ΜΕ.ΠΑ., Σχολή Μηχανικών (ΣΜΗΧ), ΠΜΣ Πληροφορική και Πολυμέσα, 2021-04-01) Vasileiou, Ioannis; Βασιλείου, ΙωάννηςAs more and more data become available as linked data, the need for efficient and effective methods for their exploration becomes apparent. Semantic summaries try to extract meaning from data, while reducing its size. State of the art structural semantic summaries, focus primarily on the graph structure of the data, trying to maximize the summary’s utility for query answering, i.e. the query coverage. In this thesis, we present four algorithms, trying to maximize the aforementioned query coverage using ideas borrowed from result diversification. The key idea among all algorithms is, instead of focusing only to the “central” nodes, to push node selection also to the perimeter of the graph. Our experiments show the potential of our algorithms and demonstrate the considerable advantages gained for answering larger fragments of user queries.