How can we represent spatial information in maps in a cognitively adequate way? The present article outlines a cognitive conceptual approach that proposes primitive conceptual elements from which maps can be constructed. Based on work in geography that starts with abstract models of geographic phenomena, namely modelisation chorematique by R. Brunet (1980, 1987), we coin primitive conceptual el...

In this work. we take into account the non gaussian properties of textures and we propose a new approach for their characterization based on bidimensional adaptive modelisation using higher order statistics. The 2DOLRIV (Bidimensionnal Overdetermined Lattice Recursive Instrumental Variable) algorithm allows accurate texture model estimation. Sets of ZD-AR coefficients obtained from the 2D refle...

This paper proposes an approach to improve the cost-effectiveness of the control of variable speed drives in the robotics field. This could be achieved by the association of brushless DC motors (BLDCM)with a reduced structure DC/AC converter that is the three-switch inverter (TSI) equipping a robot arm. In a first step, we devoted the analysis, modelisation and control of a three-switch inverte...

Simulation is often used to evaluate supply chain or workshop management. This simulation task needs models, which are difficult to construct. The aim of this work is to reduce the complexity of a simulation model design. The proposed approach combines discrete and continuous approaches in order to construct speeder and simpler reduced model. The simulation model focuses on bottlenecks with a d...

Language theory, symbolic dynamics, modelisation of viral insertion into the genetic code of a host cell motivate the introduction of new types of bialgebras, whose coalgebra parts are not necessarily coassociative. Similarly, certain algebraic descriptions of combinatorial objects such as weighted directed graphs through a coalgebraic formulation often require at least two coalgebras whose cop...

ÐSeveral RGD peptidomimetics have been prepared, in a convergent way, from the common ortho-aminotyrosine template (O-substituted with an anchorage-arm or a methyl group, and aN-substituted with a ̄uorine tag for XPS analysis), and various o-aminoacid derivatives. The most ̄exible compounds have shown a biological activity similar to that of the peptide reference (RGDS) in the platelet aggregat...

Segmental evaluation of HTS HTS is a parametric speech synthesis system based on the use of Hidden Markov Models (HMM). HTS is now widely used but very few studies have been conducted to analyze the influence of parameters on the quality of the synthetic speech. The aim of this paper is to provide an objective evaluation of the quality of the synthetic speech produced by HTS in order to assess ...

In this paper, we consider the problem of energy balanced data propagation in wireless sensor networks and we generalise previous works by allowing realistic energy assignment. A new modelisation of the process of energy consumption as a random walk along with a new analysis are proposed. Two new algorithms are presented and analysed. The first one is easy to implement and fast to execute. Howe...

Efficient compression algorithms generally use wavelet transforms. They try to exploit all the signal dependencies that can appear inside and across the different sub-bands of the decomposition. This provides highly complex algorithms that can’t generally be implemented for real-time purposes. However, efficiency of a coding scheme highly depends on bit allocation. In this paper, we present a n...