Résumé — Avec le développement des systèmes de décisionnel en générale et les entrepôts de données de manière particulière, il est devenu primordiale d’avoir une visibilité de la conception de l’entrepôt de données avant sa création, et cela vu l’importance de l’entrepôt de données qui se considère la source unique des données donnant sens à la décision. Dans un système de décisionnel, le bon f...

In this work, we study the properties of an additive noise undergoing a dual-tree M -band wavelet analysis. We express the relationships governing noise coefficients both in the primal and the dual tree. The knowlegde of the noise statistical properties is particularly useful for the design of efficient denoising methods in the framework of a dual-tree wavelet analysis. Our main contribution co...

In this paper, we present an algorithm to infer a fuzzy partition over a set of numerical values. This algorithm is based on the mathematical morphology and is expressed in the formal language theory. We use it during the construction of a fuzzy decision tree, in the case where no fuzzy partition is available for a numerical attribute. R esum e Dans ce rapport, nous pr esentons un algorithme po...

Résumé. La prédiction de séquences de symboles est une tâche ayant de multiples applications. Plusieurs modèles de prédiction ont été proposés tels que DG, All-k-order markov et PPM. Récemment, il a été montré qu’un nouveau modèle nommé Compact Prediction Tree (CPT) utilisant une structure en arbre et un algorithme de prédiction plus complexe, offre des prédictions plus exactes que plusieurs ap...

This article presents a quadtree-based data structure for effective indexing of images. An image is represented by a multi-level feature vector, computed by a recursive decomposition of the image into four quadrants and stored as a full fixed-depth balanced quadtree. A node of the quadtree stores a feature vector of the corresponding image quadrant. A more general quadtree-based structure calle...

Computers are widely used and interconnected but are not as secure as we could expect. For example, a secure execution cannot even be achieved or proved against a software (the system administrator) or hardware attacker (a logical analyzer on the computer buses). In this article a strong cryptography-based architecture with an operating system support is presented to reach such security levels ...

Morphological analysis of urban fabric is a relevant step in order to perform the analysis of urban dynamics and to simulate their evolutions. In this context, the objective of this paper is to test to test two relational data mining methods (Cardinalisation and Quantiles) to label urban blocks and to produce rules on their morphology. The objective is to automate the identification of urban fa...