A time-frequency distribution provides many advantages in the analysis of multicomponent nonstationary signals. The simultaneous signal representation with respect to the time and frequency axis defines the signal amplitude, frequency, bandwidth, and the number of components at each time moment. The Rényi entropy, applied to a time-frequency distribution, is shown to be a valuable indicator of ...

Via Generalized Splitting Zdravko I. Botev, Pierre L’Ecuyer DIRO, Université de Montreal, C.P. 6128, Succ. Centre-Ville, Montréal (Québec), H3C 3J7, CANADA, {[email protected], [email protected]} Gerardo Rubino INRIA Rennes Bretagne Atlantique, Campus Universitaire de Beaulieu, 35042 Rennes Cedex, FRANCE, [email protected] Richard Simard DIRO, Université de Montreal, C.P. 6128...

This letter considers the problem of detecting and characterizing a target buried beneath a rough surface separating two homogeneous half spaces. The problem of detecting the target is tackled by analyzing the frequency-averaged Wigner–Ville function, the purpose of which is to filter out rough surface scattering. Characterization of the target is performed using the iterative solution derived ...

This paper describes two systems using embodied conversational agents (ECAs) for language learning. The first system, called Ville, is a virtual language teacher for vocabulary and pronunciation training. The second system, a dialogue system called DEAL, is a role-playing game for practicing conversational skills. Whereas DEAL acts as a conversational partner with the objective of creating and ...

The structure is said to be damaged if there a permanent shift in the post-event natural frequency of as compared with pre-event frequency. To assess damage structure, time-frequency approach that can capture and required. In this study, determine these frequencies, local maximum synchrosqueezing transform (LMSST) method employed. Through simulation results, we have shown traditional methods su...

New method of observation and diagnosis of inverter-fed induction motor drives is developed and tested. Unsymmetrical conditions concerning the machine impedances or valves operation are reflected in the spectrum of the current spacephasor. We estimate the spectrum of the space-phasor with the help of the Wigner-Ville distribution (WVD) and we obtain its time-frequency representation with excel...

Nous proposons dans cet article une contribution à la théorie récemment introduite des signaux quasi-cyclostationnaires généralisés. Cette classe de signaux étend la classe des signaux quasicyclostationnaires au cas de signaux dont les fréquences cycliques dépendent du temps. Des représentations temps-fréquence de ces signaux sont données en fonction des statistiques cycliques généralisées. Not...

Jean-François Cordeau • Goran Stojković • François Soumis • Jacques Desrosiers École des Hautes Études Commerciales and GERAD, 3000, chemin de la Côte-Sainte-Catherine, Montréal, Canada H3T 2A7 École Polytechnique and GERAD, C.P. 6079, Succ. Centre-Ville, Montréal, Canada H3C 3A7 École Polytechnique and GERAD, C.P. 6079, Succ. Centre-Ville, Montréal, Canada H3C 3A7 École des Hautes Études Comme...