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Searching for authors named "Yannis Theoharis" – sorted by Relevance.

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Help! 8 documents found, showing 1 through 8.
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  • On Power Laws and the Semantic Web  
  • by Yannis Theoharis
  • …Semantic Web (as the WWW itself) can be seen as a decentralized system that self organizes and evolves, scaling to unforeseen conditions, features which are typical of complex systems. A big amount of Semantic Web (SW) schemas expressed in either RDFS [11] or OWL [18] has been developed during the l…
  • Cited by 1 (1 self) – Add To MetaCart
  • Benchmarking Database Representations of RDF/S Stores  
  • by Yannis Theoharis, Vassilis Christophides, Grigoris Karvounarakis — 2005 — IN ISWC
  • …In this paper we benchmark three popular database representations of RDF/S schemata and data: (a) a schema-aware (i.e., one table per RDF/S class or property) with explicit (ISA) or implicit (NOISA) storage of subsumption relationships, (b) a schema-oblivious (i.e., a single table with triples o…
  • Cited by 10 (1 self) – Add To MetaCart
  • On Ranking RDF Schema Elements (and its Application in Visualization)  
  • by Yannis Tzitzikas, Dimitris Kotzinos, Yannis Theoharis
  • …Abstract: Ranking is a ubiquitous requirement whenever we confront a large collection of atomic or interrelated artifacts. This paper elaborates on this issue for the case of RDF schemas. Specifically, several metrics for evaluating automatic methods for ranking schema elements are proposed and disc…
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  • On Storage Policies for Semantic Web Repositories that Support Versioning  
  • by Yannis Tzitzikas, Yannis Theoharis, Dimitris Andreou
  • …Abstract. This paper concerns versioning services over Semantic Web (SW) repositories. We propose a novel storage index (based on partial orders), called POI, that exploits the fact that RDF Knowledge Bases (KB) have not a unique serialization (as it happens with texts). POI can be used for storing …
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  • On Versioning and Archiving Semantic Web Data  
  • by Yannis Tzitzikas, Yannis Theoharis, Dimitris Andreou
  • …This paper concerns versioning services over Semantic Web (SW) repositories. We propose a novel storage index (based on partial orders), called POI, that exploits the fact that RDF Knowledge Bases (KBs) (a) have not a unique serialization (as it happens with texts) and (b) their versions are usually…
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  • IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERING 1 On Graph Features of Semantic Web Schemas  
  • by Yannis Theoharis, Yannis Tzitzikas, Dimitris Kotzinos, Vassilis Christophides
  • …Abstract — In this paper, we measure and analyze the graph features of Semantic Web (SW) schemas with focus on powerlaw degree distributions. Our main finding is that the majority of SW schemas with a significant number of properties (resp. classes) approximate a power-law for total-degree (resp. nu…
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  • Mitos: Design and Evaluation of a DBMS-based Web Search Engine  
  • by Panagiotis Papadakos, Yannis Theoharis, Yannis Marketakis, Nikos Armenatzoglou, Yannis Tzitzikas
  • …Engineering a Web search engine offering effective and efficient information retrieval is a challenging task. Mitos is a recently developed search engine that offers a wide spectrum of functionalities. A rather unusual design choice is that its index is based on an object-relational database system.…
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  • The Anatomy of Mitos Web Search Engine  
  • by Panagiotis Papadakos, Giorgos Vasiliadis, Yannis Theoharis, Nikos Armenatzoglou, Stella Kopidaki, Yannis Marketakis, Manos Daskalakis, Kostas Karamaroudis, Giorgos Linardakis, Giannis Makrydakis, Vangelis Papathanasiou, Lefteris Sardis, Dimitris Velegrakis, Yannis Tzitzikas — 2008
  • …Abstract Engineering a Web search engine offering effective and efficient information retrieval is a challenging task. This document presents our experiences from designing and developing a Web search engine offering a wide spectrum of functionalities and we report some interesting experimental resu…
  • Cited by 2 (2 self) – Add To MetaCart
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