Cet article s’intéresse à la manière dont l’écriture littéraire peut contribuer valorisation et transmission du patrimoine urbain par mise en lumière d’un genius loci. À partir de cette notion « génie lieu » appliquée ville Sienne, vécue trois écrivains, Hippolyte Taine, André Suarès, Dominique Fernandez, nous étudierons les éléments patrimoines matériels immatériels que le langage valoriser au...

Nantes et la métropole nantaise ont développé le « dialogue citoyen », outil pour associer population aux décisions, en particulier dans conception de ville. Cet intermédiaire entre top-down classique démocratie participative évite les sujets économiques culturels pourtant essentiels modèle nantais. Au-delà des contraintes techniques, c’est certainement caractère contradictoire modèles mobilisé...

A symmetry classification of possible interactions in a diatomic molecular chain is provided. For nonlinear interactions the group of Lie point transformations, leaving the lattice invariant and taking solutions into solutions, is at most five-dimensional. An example is considered in which subgroups of the symmetry group are used to reduce the dynamical differential-difference equations to pure...

Résumé : Nous présentons un modèle d’environnement sémantique pour la simulation urbaine. Dans ce types de simulations, les agents représentent les individus ou les véhicules dans la ville, qui constitue leur environnement. Notre objectif est de rendre cet environnement compréhensible par les agents, afin de leur permettre de faire des choix d’actions cohérents. L’idée que nous adoptons dans no...

The information conveyed by the discrete Wigner-Ville representations of real, complex or analytic signals is highly redundant, each time-frequency location being related to others via non-obvious relationships. In this paper, we demonstrate that there also exists a large amount of linear relationships between time-frequency samples. This implies that a whole discrete Wigner-Ville representatio...

Under-determined blind source separation aims to separate N non-stationary sources from M (M<N) mixtures. Paper presents a time-frequency approach (TF) to under-determined blind source separation of N non-stationary sources from M mixtures(M<N).It is based on Wigner-Ville distribution and Khatri-Rao product. Improved method involves a two step approach which involves the estimation of the mixin...

In this paper we present a very effective method for texture segmentation and analysis using a local spectral method. The idea is to use a modular pattern detection in textured images based on the use of a Pseudo-Wigner Distribution (PWD) followed by a decorrelation procedure that consists of a principal component analyzer (for texture segmentation). The goal is to combine the advantages of a h...

This article demonstrates how time-frequency methods can be used in applications of image processing, such as monitoring, detecting inhomogeneities in textures and texture segmentation. A Pseudo Wigner Distribution (PWD) for 2D images free of aliasing and simultaneously increasing the spatial frequency support is defined through the use of a new analytic signal. In addition to that, cross-terms...

Cohen's class of Time-Frequency Distributions (CTFDs), which includes the spectrogram and the Wigner-Ville distribution, has significant potential for the analysis of non-stationnary signals. In order to efficiently compute long signals time-frequency representations, we propose fast algorithms using a recursive approach. First, we introduce a recursive algorithm dedicated to the spectrogram co...

Digital modulation signals such as FSK are time-varying signals that can he represented in the time-frequency representation. The smooth lag-windowed Wigner-Ville distribution (SLWWVD) is proposed as a method to obtain accurate time-frequency representation of FSK signals used in HF (High Frequency) radio communications. Unlike existing time-frequency distributions such as the windowed Wigner-V...