1. LRC MESO, École normale supérieure de Cachan (CMLA) et CEA-DAM, 61, avenue du Président Wilson, F-94235 Cachan Cedex, France. 2. Service de physique de l’état condensé (URA 2464), CEA-Saclay, F-91191 Gif-sur-Yvette Cedex, France 3. Centre de Recherches Mathématiques, Université de Montréal, C.P. 6128, Succ. Centre-ville, Montréal, (QC) H3C 3J7, Canada, 4. Université du Québec, Trois-Rivières...

High-range resolution inverse synthetic aperture radar (ISAR) imaging is a promising tool for non-cooperative target identification and has attracted wide interest within the scientific and military communities. Most of the existing ISAR algorithms are based on the Fourier transform. However, for long coherent integration time or for fast maneuvering targets, simple Fourier processing without c...

An Adaptative Neuro-Fuzzy Inference System (ANFIS) is developed to predict the acoustic form function (FF) for an infinite length cylindrical shell excited perpendicularly to its axis. The Wigner-Ville distribution (WVD) is used like a comparison tool between the calculated FF by the analytical method and that predicted by the neuro-fuzzy technique for a copper tube. During the application of t...

Program visualization (PV) is potentially a useful method for teaching programming basics to novice programmers. However, there are very few studies on the effects of PV. We have developed a PV tool called ViLLE at the University of Turku. In this paper, multiple studies on the effects of the tool are presented. In addition, new qualitative data about students’ feedback of using the tool is pre...

Heart sounds and murmurs are time-varying signals that would best be analyzed using time-frequency analysis. Windowed Wigner-Ville distribution (WWVD) and smooth windowed Wigner-Ville distribution (SWWVD) are used to obtain the timefiequency representation (TFR) of the signal. Determination of parameter setting of WWVD and SWWVD will eliminate the cross-terms and improve TFR. The accuracy of TF...

The Wigner-Ville Distribution (WVD) and Pseudo-Wigner-Ville Distribution (PWVD) are very popular and effective methods for detecting Linear Frequency Modulated (LFM) signals in noisy environments. Hough transform is also widely used method for detection and parameter estimation of chirp signals. However, when there are signals with very different strength from each other, it is difficult to sim...

The paper deals with analysis and time-frequency representation of multicomponent signals characterised by non-linear frequency variation in time. A certain type of higher-order time-frequency distribution, referred to as Polynomial Wigner-Ville distribution [2], has been designed to achieve delta function concentration in the timefrequency plane for this class of signals. In the presence of mu...

This article describes the CALST project, in which the primary aim is to develop Ville-N, a CAPT system for learners of Norwegian as a second language. Since there is no accepted pronunciation standard in Norwegian, the system uses four dialects (represented by one male and one female speaker each). Ville-N makes use of L1-L2map, a tool for multilingual contrastive analysis, to generate a list ...

Département de Biochimie, Université de Montréal, C.P. 6128, Succursale centre-ville, 9 Montréal, Québec, H3C 3J7, Canada. 10 Department of Bioengineering, McGill University, Montreal, Quebec, H3A0C3, Canada. 11 Ernest Rutherford Physics Building, 3600 rue University, McGill University, Montreal, Québec, 12 H3A2T8 13 Department of Biomedical Engineering and Center for Biological Systems Enginee...