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Saffi M.,Ecole Superieure de Technology | Cheddadi A.,Ecole Mohammadia DIngenieurs
Hydrological Sciences Journal | Year: 2010

Illegal pumping from underground reservoirs is approached as an inverse problem. The procedure seeks among a set of suspected potential areas the ones from which water is effectively pumped out (or in) and at what rate does this take place? Influence coefficient and finite element are combined in order to simulate the aquifer response to hypothetical pumping scenarios. Then the optimal scenario which makes of simulated head distribution the best fit to the observed headset is retained as solution to the foregoing question. This optimal scenario is derived by minimizing the classical least squares error using the Levenberg-Marquardt Algorithm (LMA). Under the condi- tions of the treated aquifer example it is observed that LMA is non-convergent unless a regularizing measure is taken during the calculation of the correction applied to the parameter-vector between two successive iterations. The procedure is tested with uniform and non-uniform pumping. In both cases, it yields good identified pumping rates within the observation period, but its performance deteriorates markedly for the rates corresponding to the days when no monitoring well is yet active. © 2010 IAHS Press. Source

Raji A.,Sultan Moulay Slimane University | Hasnaoui M.,Cadi Ayyad University | Naimi M.,Sultan Moulay Slimane University | Slimani K.,Ecole Mohammadia DIngenieurs | Ouazzani M.T.,Ecole Mohammadia DIngenieurs
Computers and Fluids | Year: 2012

In this paper, a numerical study is carried out on thermal natural convection in a square cavity with adiabatic horizontal walls, thermally active vertical walls (maintained at constant but different temperatures) and containing blocks. The governing parameters are the Rayleigh number (10 3Ra10 8), the relative thermal conductivity of the solid blocks (10 -3k r10 3) and their number (N=1, 4, 16 and 64). The effect of these parameters on the fluid flow (air) and heat transfer through the active walls of the cavity is analyzed in the case where the volume occupied by the fluid is maintained constant. In comparison with an enclosure equipped with one block located in its centre, the results obtained in the case of the block's fragmentation show that the heat transfer and the flow intensity could be significantly reduced by increasing the number of the blocks and their relative conductivity, k r. It is also demonstrated that, the results of the saturated porous medium are recovered when the number of blocks is large enough (1600 < N < 8100). © 2012 Elsevier Ltd. Source

Brahim E.F.,Ecole Mohammadia DIngenieurs | Mohammed K.I.,Ecole Mohammadia DIngenieurs | Samir B.,Ecole Mohammadia DIngenieurs
World Academy of Science, Engineering and Technology | Year: 2010

E-learning is not restricted to the use of new technologies for the online content, but also induces the adoption of new approaches to improve the quality of education. This quality depends on the ability of these approaches (technical and pedagogical) to provide an adaptive learning environment. Thus, the environment should include features that convey intentions and meeting the educational needs of learners by providing a customized learning path to acquiring a competency concerned In our proposal, we believe that an individualized learning path requires knowledge of the learner. Therefore, it must pass through a personalization of diagnosis to identify precisely the competency gaps to fill, and reduce the cognitive load To personalize the diagnosis and pertinently measure the competency gap, we suggest implementing the formative assessment in the e-learning environment and we propose the introduction of a pre-regulation process in the area of formative assessment, involving its individualization and implementation in e-learning. Source

Ouanaim M.,Al Akhawayn University | Harroud H.,Al Akhawayn University | Berrado A.,Ecole Mohammadia DIngenieurs | Boulmalf M.,Al Akhawayn University
IWCMC 2010 - Proceedings of the 6th International Wireless Communications and Mobile Computing Conference | Year: 2010

User profiling is commonly used to support personalization as well as to enhance usability of software systems by automatically adapting to the needs and preferences of their users. This paper presents an approach to dynamically update mobile users' profiles so that they can be provided with appropriate services while moving from one location to another. We propose an XML generic user profile structure that is dynamically updatable as the user experiences new services and that can be used by different software systems and applications. The proposed profile learning mechanism makes use of clustering users with a subset of similar attributes to predict appropriate services to a new user, and segmenting services with a subset of similar usage to discover and recommend new services that might be of interests to a mobile user. We demonstrated the feasibility of our approach by presenting a case study in tourism where tourists are assisted during their travels by providing them with services and information of interest. The tourist preferences and her/his current location are incorporated in the proactive formulation of suggestions on the tourist mobile devices about nearby points of interests (e.g. museums, restaurants....). Copyright © 2010 ACM. Source

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