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Searching for authors named "Nicolas Spyratos" – sorted by Relevance.

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  • A Partition Model for Dimensional Data Analysis  
  • by Nicolas Spyratos — 2006 — LRI Research Report
  • …Abstract. In decision-support applications one often needs to analyse transactional data accumulated over time and usually stored in a data warehouse. The data is analysed along various dimensions, and at various levels in each dimension. Although several SQL extensions are available today for the a…
  • Cited by 2 (2 self) – Add To MetaCart
  • Metadata inference for document retrieval in a distributed repository  
  • by Nicolas Spyratos — 2004 — In Proceedings of the 9th Asian Computing Science Conference (ASIAN’04) (LNCS 3321
  • …Abstract. This paper describes a simple data model for the composition and metadata management of documents in a distributed setting. We assume that each document resides at the local repository of its provider, so all providers ’ repositories, collectively, can be thought of as a single database of…
  • Cited by 3 (1 self) – Add To MetaCart
  • Object Functional Dependencies and the Semantics of Class Extensions  
  • by Kazem Lellahi, Nicolas Spyratos — 1996
  • …We introduce the concept of object functional dependency for object oriented models, and we study consistency, satisfaction and functional implication in the context of a class extension. We then use functional implication to define the formal semantics of a class extension by a least fixpoint const…
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  • Context in Artificial Intelligent and Information Modeling  
  • by Manos Theodorakis, Nicolas Spyratos — 2002 — Proceedings of SETN 2002
  • …The modeling, representation and use of context is the challenge for the coming years in Artificial Intelligence, especially when we now face very large knowledge bases, complex problems and multimedia means. The notion of context is important since it can capture many of the interesting aspects …
  • Cited by 1 (0 self) – Add To MetaCart
  • On Personalizing the Catalogs of Web Portals  
  • by Nicolas Spyratos Laboratoire, Nicolas Spyratos — 2002 — In Proc. of the Special Track on the Semantic Web at the 15th Inter. FLAIRS'02 Conf
  • …In this paper we propose a method for personalizing the catalogs of Web Portals. We propose SCSL, a declarative language for defining personal semantic channels over Web Portal catalogs. A semantic channel is actually a view of one or more Portal catalogs. SCSL offers powerful primitives for fi…
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  • Querying with Preferences in a Digital Library  
  • by Nicolas Spyratos And, Nicolas Spyratos, Vassilis Christophides — 2005 — In Dagstuhl Seminar (No 05182) Federation over the Web
  • …We consider a collection of federated sources of the web, and a community of users that are interested in documents residing in one or more among the federated sources. The search for documents of interest is supported by a mediator that we call a digital library. The library simply indexes all …
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  • Taxonomy-based Conceptual Modeling for Peer-to-Peer Networks  
  • by Yannis Tzitzikas, Carlo Meghini, Nicolas Spyratos, Carlo Meghini Nicolas Spyratos — 2003 — In Procs of 22th Int. Conf. on Conceptual Modeling, ER’2003
  • …We present a taxonomy-based conceptual modeling approach for building P2P systems that support semantic-based retrieval services. We adopt this simple conceptual modeling approach due to its advantages in terms of ease of use, uniformity, scalability and e#ciency. As each peer uses its own taxono…
  • Cited by 8 (6 self) – Add To MetaCart
  • Deriving Valid Expressions from Ontology Definitions  
  • by Yannis Tzitzikas, Nicolas Spyratos, Panos Constantopoulos — 2001 — In 11th European-Japanese Conference on Information Modelling and Knowledge Bases
  • …. In this paper, we consider an ontology as a set of terms together with three binary relations on terms, called synonymy, subsumption and crossreference. We present a model-theoretic interpretation of ontologies and we show that this approach although appropriate for deciding the soundness of an on…
  • Cited by 5 (5 self) – Add To MetaCart
  • On Personalizing the Catalogs of Web Portals  
  • by Nicolas Spyratos, Yannis Tzitzikas, Vassilis Christophides — 2002 — In Proc. of the Special Track on the Semantic Web at the 15th Inter. FLAIRS'02 Conf
  • …In this paper we propose a method for personalizing the catalogs of Web Portals. We propose SCSL, a declarative language for defining personal semantic channels over Web Portal catalogs. A semantic channel is actually a view of one or more Portal catalogs. SCSL offers powerful primitives for fi…
  • Cited by 7 (3 self) – Add To MetaCart
  • Extended Faceted Ontologies  
  • by Yannis Tzitzikas, Nicolas Spyratos, Panos Constantopoulos, Anastasia Analyti — 2002
  • …A faceted ontology consists of a set of facets, where each facet consists of a predefined set of terms structured by a subsumption relation.…
  • Cited by 1 (1 self) – Add To MetaCart
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