International Conference Papers

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Author: search.filters.author.Alimazighi, ZaiaEnd date: 2009

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    An Ontology and a Description Schema Base for Relational Database Integration
    (IEEE, 2008-04-19) Salhi, Nadir; Benna, Amel; Alimazighi, Zaia; Amrouche, Bilal; Makhloufi, Ferhat
    Distributed Data sources integration is a method aiming to offer access for users to multiple databases through requests on a global schema. The use of an ontology is seamlessly the most promising approach for a possible automation to deal with the semantic heterogeneity, considered as the most important difficulty. In this paper we propose approach uses a domain ontology to solve semantic conflicts considered as a global schema and a description schema base in order to manage the mappings, done manually by the administrator of every relational source, between the global schema and the different databases. Moreover, we describe the algorithms related to relevant sources localization, requests decomposition, inter-sources joint, requests rewriting and recomposition of the results as tuples. Finally, we present a prototype for relational databases integration.
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    Extension of the Wahl-Rothermel temporal model for the multimedia documents
    (2007-04-12) Maredj, Azze-Eddine; Alimazighi, Zaia; Sadallah, Madjid
    Multimedia presentation defines composition of different media having inherent or assigned temporal behavior: text, images, animations, audio and video. Temporal composition is the most important feature of multimedia presentations because it defines the overall scheduling of temporal events. In this paper, our goal is to propose an extension of Whal and Rothermel temporal model to increase its degree of expressiveness. For that, a new delay definition is proposed.
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    A flexible distance for the spatial placement in a multimedia document
    (Institute of Electrical and Electronics Engineers ( IEEE ), 2008-04-07) Maredj, Azze-Eddine; Tonkin, Nourredine; Sadallah, Madjid; Alimazighi, Zaia
    In the multimedia documents authoring systems the management of spatial and temporal inter-objects relations is the most delicate task. Spatial relations management refers to the appropriate means to express relations between the document objects and guarantee their consistency. Usually it is represented by spatial model which performances depend on its expressivity degree, on its positioning precision and on the ability to express a desired overlap. One of the most important factor that affects performnaces is the distance associated to the relations. To enhance the expressivity and precision degrees and to allow the specification of desired overlap, we introduce, in this paper, the flexible distance concept.
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    Un modèle logique de documents pour les interactions multimédia
    (JTEA, 2008-05-02) Maredj, Azze-Eddine; Alimazighi, Zaia; Tonkin, Nourredine; Sadallah, Madjid
    La dimension temporelle d’un document multimédia interactif confère à ses objets des comportements différents de ceux d’un document classique. De nouveaux besoins de lecture doivent être considérés pour maîtriser sa complexité de perception. Les interactions utilisateur sont une solution à ces besoins. Toutefois, dans les systèmes multimédia actuels, c’est uniquement sur les objets du document que reposent ces interactions et de plus le lecteur est réduit à un rôle passif. Dans cet article, nous proposons un modèle logique de documents multimédia où les objets ne sont plus perçus comme des entités indissociables mais peuvent être regroupés en scènes définissant des parcours de lecture selon le besoin. De plus, le lecteur peut définir ses propres parcours de lecture. Un ensemble de mécanismes d’interactions y est proposé. --------------- The temporal dimension of an interactive multimedia document confers to its objects behaviors different from those of a traditional document. New needs for reading must be considered to control its complexity of perception. The user interactions are a solution to these needs. However, in the current multimedia systems, the interactions are based only on the document objects and the reader is reduced to a passive role. In this paper, we propose a logical model for multimedia documents where the objects are no longer seen as inseparable entities but can be grouped into scenes defining paths of reading as needed. In addition, the reader can define its own paths of reading. A set of interaction mechanisms is proposed.