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

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  • An Algebraic Method for Compressing Very Large Symbolic Data Tables  
  • by Yannis Tzitzikas — 2004 — In Procs. of the Workshop on Symbolic and Spatial Data Analysis of ECML/PKDD 2004
  • …Although symbolic data tables summarize huge sets of data they can still become very large in size. This paper proposes a method for compressing a symbolic data table using the recently emerged Compound Term Composition Algebra. One charisma of CTCA is that the closed world hypotheses of its oper…
  • Cited by 3 (3 self) – Add To MetaCart
  • Exploiting Semantic Networks to Generate Hypermedia  
  • by Yannis Tzitzikas — 1996 — 3rd Doctoral Consortium on Advanced Information Systems Engineering
  • …Hypermedia is a hot research topic nowadays with a wide application domain. In this paper we study the problem of generating hypermedia presentations from semantic network-based repositories. After discussing the application domain of this approach, we focus on issues concerning the mapping of sem…
  • Cited by 1 (1 self) – Add To MetaCart
  • Dependency Management for the Preservation of Digital Information  
  • by Yannis Tzitzikas — 2007 — In Procs of the 18th Intern. Conf. on Database and Expert Systems Applications, DEXA’2007
  • …Abstract. The notion of dependency is ubiquitous. This paper approaches this notion from the perspective of digital information preservation. At first, an abstract notion of module and dependency is introduced. Subsequently, and for building preservation information systems, the notion of profile is…
  • Cited by 1 (1 self) – Add To MetaCart
  • Collaborative Ontology-based Information Indexing and Retrieval  
  • by Yannis Tzitzikas, Yannis Tzitzikas, Panos Constantopoulos — 2002
  • …An information system like the Web is a continuously evolving system consisting of multiple heterogeneous information sources, covering a wide domain of discourse, and a huge number of users (human or software) with diverse characteristics and needs, that produce and consume information. The challen…
  • Cited by 5 (5 self) – Add To MetaCart
  • Flouris: Mind the (Intelligibility) Gap  
  • by Yannis Tzitzikas, Giorgos Flouris — 2007 — 11th European Conference on Research and Advanced Technology for Digital Libraries, ECDL’2007
  • …Abstract. Intelligibility, evolution and emulation are some of the key notions for digital information preservation. In this paper we define formally these notions on the basis of modules and inter-module dependencies. Subsequently, we discuss how we can handle the evolution of modules and dependenc…
  • Cited by 1 (1 self) – Add To MetaCart
  • Ostensive Automatic Schema Mapping for Taxonomy-Based Peer-to-Peer Systems  
  • by Yannis Tzitzikas, Carlo Meghini — 2003 — Best Paper Award
  • …This paper considers Peer-to-Peer systems in which peers employ taxonomies for describing the contents of their objects and for formulating semantic-based queries to the other peers of the system. As each peer can use its own taxonomy, peers are equipped with inter-taxonomy mappings in order to carr…
  • Cited by 23 (13 self) – Add To MetaCart
  • Context-Driven Information Base Update  
  • by Panos Constantopoulos, Yannis Tzitzikas — 1996 — Proc. of the 8th Intern. Conference on Advanced Information Systems Engineering (CAiSE'96
  • …A major issue in information management is information update. In this paper we address this problem within the framework of a fairly general information model incorporating notions of context as a way to control and drive the update operations. We introduce three kinds of contexts: role,task and fo…
  • Cited by 15 (12 self) – Add To MetaCart
  • Query Evaluation in Peer-to-Peer Networks of Taxonomy-based Sources  
  • by Yannis Tzitzikas, Carlo Meghini — 2003 — In Proceedings of 19th Int. Conf. on Cooperative Information Systems, CoopIS’2003
  • …We consider the problem of query evaluation in Peer-to-Peer (P2P) systems that support semantic-based retrieval services. We confine ourselves to the case where the peers employ taxonomies for describing the contents of the objects, and articulations, i.e. inter-taxonomy mappings, for bridging the i…
  • Cited by 8 (6 self) – Add To MetaCart
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