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Casablanca, Morocco

Hachkar Z.,EST Safi | Mounir B.,EST Safi | Farchi A.,FST Settat | Abbadi J.,Mohammed V University
Physical and Chemical News | Year: 2011

The aim of this paper is to study the feasibility of using Dynamic Time Warping algorithm to implement a system of automatic recognition of Arabic isolated words. The extraction technique used to characterize the signal is "Mel Frequency cepstral coefficients or MFCC. Other prosodic parameters, such as energy, first and second drifts of MFCC", were concatenated to basic MFCC coefficients in order to search for more effective signal characteristics. A corpus of apprenticeship and of test pronounced by several Moroccan speakers is established in order to evaluate system performances. The better recognition rate (86%) was obtained while using, as characteristics, 12 coefficients MFCC, an energy coefficient, and 26 coefficients obtained from the first and second drifts of the MFCC coefficients and energy. Source


Radi B.,FST Settat | Ayadi A.,LMSSDT | Cherouat A.,University of Technology of Troyes | Moreau L.,University of Technology of Troyes | El Hami A.,INSA Rouen
Key Engineering Materials | Year: 2011

In this study, we present an experimental/numerical methodology which aims to improve 3D thin sheet hydroforming. The experimental study is dedicated to the identification of stress-strain flow by using the Nelder-Mead simplex algorithm optimization from the global measure of displacement and force. Applications are made to the simulation of thin sheet hydroforming using different die geometry to show the efficiency of the proposed methodology to localize plastic instability, thinning of the blanks and damage initiation under different forming condition. © (2011) Trans Tech Publications. Source


Makrizi A.,GGDA | Radi B.,FST Settat | El Hami A.,INSA Rouen
Civil-Comp Proceedings | Year: 2010

In topology optimization problems, we are often forced to deal with large-scale numerical problems, so that the domain decomposition method occurs naturally. Consider a typical topology optimization problem, the minimum compliance problem of a linear isotropic elastic continuum structure, in which the constraints are the partial differential equations of linear elasticity. We subdivide the partial differential equations into two subproblems posed on non-overlapping sub-domains. In this paper, we consider the resulting problem as multilevel one and show that it can be written as one level problem. © Civil-Comp Press, 2010. Source


Farchi A.,FST Settat | Oualine N.,FST Settat | Mounir B.,EST Safi
Physical and Chemical News | Year: 2013

A method of isolated vocal word recognition by the identification of the upper envelope of their electric signals (temporal Prints) has been achieved. This method consists on recognizing different words pronounced by different persons. Thus, reference words have been created and the noise signal has been recorded to take into account the effect of the local conditions. This method of voice recognition was made trough the acquisition of the word to recognize, the extraction of the useful information, the determination of the upper envelope of the electric signal, the smoothing of the envelope, the comparison of the envelope of the word to recognize with the reference word and the final decision. Source


Mahfoudh A.,LMSSDT | Cherouat A.,University of Technology of Troyes | El Hami A.,INSA Rouen | Radi B.,FST Settat
Advanced Materials Research | Year: 2012

This paper presents an experimental/numerical methodology which aims to improve 3D welded tube considering their anisotropic effect, geometrical singularities found in the welded joint, and heat affected zone behaviour by hydroforming process. This process contributes to reduce the number of welding and assembly operations needed to generate complex structures, while improving the weight saving and quality of finished parts. In spite of the advances in the performance of this manufacturing technology, some problems are linked to particularities of certain raw materials and additional studies must be developed, like in the case of welded tubes. The experimental study is dedicated to the identification of stress-strain flow of the base metal and the heat-affected zone from the global measure of tube displacement, thickness evolution and internal pressure expansion. Nanoindentation test is adapted to investigate the heat affected zone mechanical behaviour. Workpiece behaviour's models used to simulate the expansion tests, made it possible to highlight the combined effects of the inhomogeneous behaviour of basic material and heat affected zone, as well as the geometrical singularities found in the welded tubes. From the simulations carried out, it is clear the influence of the plastic flow behaviour of the welded tube in the final results (thickness distribution, stress instability, tube circularity, critical thinning and rupture). © (2012) Trans Tech Publications, Switzerland. Source

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