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Lamharhar H.,Mohammed V University | Chiadmi D.,Ecole Mohammadia dIngenieurs EMI | Benhlima L.,Ecole Mohammadia dIngenieurs EMI
Transforming Government: People, Process and Policy | Year: 2014

Purpose: In e-government domain, an efficient semantic interoperability of services is a big challenge. In this context, semantic technologies play a fundamental role in numerous e-government programs. Indeed, these technologies enable enriching the public service description provided by different public administrations with additional semantic information, which allows automatic services processing and information exchange between involved members in comprehensive and interpretable manner, thus facilitating service integration and cooperation. The most frequently used technologies in this area are semantic web services (SWS) technology and ontology. Thus, for modelling efficiently public services, the authors have exploring, studying and analyzing some of e-government researches and projects that applied semantic technologies. Design/methodology/approach: In this paper, the authors address how semantic technologies transform the e-government domain through exploring and studying the use of SWS and ontology in numerous researches and projects applying these technologies in this area. Then, the authors have compared them through a set of criteria defined according to e-government requirements such as the SWS modelling approach for describing semantically public services, ontologies for representing governmental specific features (e.g. regulation and organizational structures) and developed portal for supporting user's perspectives. Based on this study, the authors have identified the appropriate standards, frameworks, and models for developing the framework. Findings: The authors have developed a framework for public services which enhances existing approaches with additional aspects. Thus, the approach comparing to other works improves the service ontology with a cognitive semantic approach to support the multiple usage contexts and situations of services. This semantic is developed in form of a Sit/Ctx ontology developed based on CSs model represented through conceptual graphs theory. The authors have used this model besides OWL-S, improving thus the level of automation of discovery and composition process of public services, which become more efficient with taken into consideration their interrelations and situations. Originality/value: The approach comparing to other works improves the service ontology with a cognitive semantic approach to support the multiple usage contexts and situations of public services, providing thus the end-users (people and enterprises) a better orientation in discovery process. © Emerald Group Publishing Limited. Source

Ait Kaddour A.,Mohammed V University | Benjelloun K.,Ecole Mohammadia dIngenieurs EMI | Elalami N.,Ecole Mohammadia dIngenieurs EMI | El Mazoudi E.H.,Cadi Ayyad University
Mathematical Biosciences | Year: 2014

In this paper, a new method is proposed to design an observer for a nonlinear and uncertain system describing a continuous stage structured model of a harvested fish population. The aim is to get an estimation of the biomass of fishes by stage class. In the studied model the fishing effort is considered as a control term, the stage classes as states and the quantity of captured fish as a measured output. A Takagi-Sugeno multimodel first represents the uncertain non-linear model. Next, we develop a technique for designing a multimodel observer corresponding to this system, which attenuates the effect of modelling uncertainties and measurement noise on the state estimation. The design conditions are given in linear matrix inequalities (LMIs) terms that can be solved efficiently using existing numerical tools. The validity of the proposed method is illustrated by the simulation results. © 2014 Elsevier Inc. Source

Jerrar H.,Ecole Mohammadia dIngenieurs EMI | El Marjani A.,Ecole Mohammadia dIngenieurs EMI | Boudi E.M.,Ecole Mohammadia dIngenieurs EMI
International Review on Modelling and Simulations | Year: 2015

This paper deals with gear meshing stiffness as an important input parameter for modeling the gear dynamic behavior. Several calculation models of this parameter exist in the literature and one of the best models is the comprehensive analysis (ranked level A by ISO-6336 standards) which includes all influences, this model can be performed either by direct measurements for the analysis of a manufactured gear box or by the Finite Elements Method (FEM) at the design phase. Considering that discretization error, by definition, impacts the FEM results, therefore the authors examined its effect on the calculated gear stiffness values and developed a novel model for gear meshing stiffness calculation. This model uses the exact FEM solution obtained from the discretization error estimator based on total energy deformation. Validation test was performed on a reverse spur gear system and the results showed that the proposed calculation model is suitable for providing accurate values of gear meshing stiffness. © 2015 Praise Worthy Prize S.r.l. - All rights reserved. Source

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