Search results for "Databases"
showing 10 items of 937 documents
Semantic to intelligent web era
2013
International audience; The Web has known a very fast evolution: going from the Web 1.0, known as Web of Documents where users are merely consumers of static information, to the more dynamic Web 2.0, known as social or collaborative Web where users produce and consume information simultaneously, and entering the more sophisticated Web 3.0, known as the Semantic Web by giving information a well-defined meaning so that it becomes more easily accessible by human users and automated processes. Fostering service intelligence and atomicity (the ability of autonomous services to interact automatically), remains one of the most upcoming challenges of the Semantic Web. This promotes the dawn of a ne…
Electron crystallography and non-linear optics
1999
Electron crystallography can be used to obtain specific information about molecular parameters such as the polarisability, dipole moment, and hyperpolarisability. In this, work we show how a combination of quantum mechanics and simulation methods can be used to solve several unknown organic structures and how the calculated molecular parameters can be used to predict the corresponding physical properties of the crystals.
PTNet: An efficient and green data center network
2017
International audience; In recent years, data centers have witnessed an exponential growth for hosting hundreds of thousands of servers as well as to accommodating a very large demand for resources. To fulfill the required level of demand, some approaches tackled network aspects so to host a huge number of servers while others focused on delivering rapid services to the clients by minimizing the path length between any two servers. In general, network devices are often designed to achieve 1:1 oversubscription. Alternatively, in a realistic data center environment, the average utilization of a network could vary between 5% and 25%, and thus the energy consumed by idle devices is wasted. This…
Extending CSG with projections: Towards formally certified geometric modeling
2015
We extend traditional Constructive Solid Geometry (CSG) trees to support the projection operator. Existing algorithms in the literature prove various topological properties of CSG sets. Our extension readily allows these algorithms to work on a greater variety of sets, in particular parametric sets, which are extensively used in CAD/CAM systems. Constructive Solid Geometry allows for algebraic representation which makes it easy for certification tools to apply. A geometric primitive may be defined in terms of a characteristic function, which can be seen as the zero-set of a corresponding system along with inequality constraints. To handle projections, we exploit the Disjunctive Normal Form,…
Enrichissement de schéma multidimensionnel en constellation grâce à la Classification Ascendante Hiérarchique
2016
National audience; Les hiérarchies sont des structures cruciales dans un entrepôt de don-nées puisqu'elles permettent l'agrégation de mesures dans le but de proposer une vue analytique plus ou moins globale sur les données entreposées, selon le niveau hiérarchique auquel on se place. Cependant, peu de travaux s'intéressent à la construction de hiérarchies, via un algorithme de fouille de données, pre-nant en compte le contexte multidimensionnel de la dimension concernée. Dans cet article, nous proposons donc un algorithme, implémenté sur une architecture ROLAP, permettant d'enrichir une dimension avec des données factuelles.
CSTST 2008: Proceedings of the 5th International Conference on Soft Computing as Transdisciplinary Science and Technology
2008
Edition des actes de la conférence, publiés par l'ACM
Geographical Database Watermarking by Polygon Elongation (Technical Report)
2007
Due to the ease of digital copy, watermarking is crucial to protect the intellectual property of rights owners. We propose an effective watermarking method for vectorial geographical databases, with the focus on the buildings layer. Embedded watermarks survive common geographical filters, including the essential squaring and simplification transformations, as well as deliberate removal attempts, e.g. by noise addition, cropping or over-watermarking. The impact on the quality of the datasets, defined as a composition of point accuracy and angular quality, is assessed through an extensive series of experiments. Our method is based on a quantization of the distance between the centroid of the …
Traitement des variabilités métier dans les Systèmes d'Information biologiques
2012
International audience; Les systèmes d'information scientifique nécessitent des fonctionnalités pour supporter deux types de variabilités majeures, la variabilité inter-acteurs et la variabilité inter-études. Nous traitons la variabilité inter-acteurs par un système d'importation des données garant de la qualité des données et la variabilité inter-études par l'utilisation d'un mécanisme d'annotation couplé au mécanisme de persistance. Afin de contrôler la qualité des données lors de leur importation en provenance de différents acteurs ou lors de leur annotation, nous proposons une approche basée sur deux niveaux de connaissance : 1) la connaissance relative aux applications du SI est représ…
Les systèmes d'information coopératifs : le projet DECA
2000
International audience; Ce travail répond aux besoins d'accès uniformes et coopératifs à plusieurs systèmes d'information hétérogènes. Nous décrivons un cadre de travail pour les systèmes d'information coopératifs et présentons le projet DECA qui propose une approche de médiation de contextes. La principale caractéristique de la solution proposée réside dans la résolution dynamique des conflits schématiques et sémantiques des données. Ceci est réalisé à travers le modèle AM UN, modèle orienté objet étendu pour gérer la coopération de systèmes. Une architecture faiblement couplée, basée sur le paradigme multi-agents, est présentée.
WikiBridge: a Semantic Wiki for Archaeological Applications
2010
International audience; This paper details the main concepts and the architecture of WikiBridge, a semantic wiki, developed for the project CARE (Corpus Architecturae Religiosae Europeae - IV-X saec.). The aim of the project CARE is the constitution of integrated corpus of the European Christian buildings dated from the 4th to the beginning of the 11th century. A semantic wiki, called WikiBridge, is developed in order to: 1) allow collaborative work of researchers involved in the project and 2) open the corpus to a large public. WikiBridge combines collaborative and traceability aspects of wiki with semantic consistency and query capabilities. Semantics is guaranteed by an application ontol…