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Lafi L.,University of Sousse | Feki J.,University of Sfax | Hammoudi S.,ESEO
International Conference on Computer Applications Technology, ICCAT 2013 | Year: 2013

During the last decades, the matching operation has been thoroughly studied in database systems and ontology development. Matching is critical in many application domains such as semantic web, schema and data integration, data translation. In the Model Driven Engineering (MDE) context, matching techniques between two metamodels are the centerpiece of a semi-automatic transformation process. Metamodel matching allows discovering mappings between two metamodels and then generating transformation rules. In this paper, we propose an approach for metamodel matching techniques evaluation and benchmarking. This approach firstly provides a benchmark for metamodel matching and, secondly prepares to semi-automate the transformation process according to the Model Driven Architecture (MDA). A benchmark is useful to compare the strengths and weaknesses of different metamodel matching techniques. Experimental results comparing the effectiveness of the application of various implementations of four recent techniques (Similarity Flooding, ModeICVS, SAMT4MDE andAML) on real-world metamodels are given. © 2013 IEEE.


Yuan S.-Y.,Feng Chia University | Wu Y.-L.,Feng Chia University | Perdriau R.,ESEO | Liao S.-S.,Feng Chia University
IEEE Transactions on Electromagnetic Compatibility | Year: 2013

This paper presents a combined hardware-software mechanism for the detection of electromagnetic interference of a microcontroller (μC) in daily usage. This detection mechanism is based on the instability of phase-lock loop embedded in the target μC. It can detect the presence of EMI with higher sensitivity than polling the hardware status of the μC internal registers and thus provides a better detection margin within the 10 kHz to 1 GHz EMI frequency range. Despite its relative slowness and its resource consumption, it is very robust, can be implemented in virtually any application software, and does not require any electromagnetic compatibility test equipment. © 1964-2012 IEEE.


Hammoudi S.,ESEO
ICSOFT 2011 - Proceedings of the 6th International Conference on Software and Database Technologies | Year: 2011

Context-aware development has been an emergent subject of many research works in ubiquitous computing. Few of them propose Model Driven Development (MDD) as an approach for context-aware application development. Many focus on context capture and adaptation by the use of legacy architectures and others artefacts to bind context with application logic. This work proposes a new approach called COMODE (Context Aware Model Driven Development) which advocates Model Driven Development to promote reuse, adaptability and interoperability for context-aware application development on service platforms. In this paper we focus on the transformation issue and propose a parameterized transformation as a new approach for model driven development of context-aware services.


Lafi L.,University of Sousse | Feki J.,University of Jeddah | Hammoudi S.,ESEO
MODELSWARD 2016 - Proceedings of the 4th International Conference on Model-Driven Engineering and Software Development | Year: 2016

During the last two decades the theory of model transformation has been extensively studied and subject of many research. So far, several transformation languages have been developed and implemented. Recently, a metamodel matching technique has been proposed in order to find mapping models that support the deduction of transformations definitions. The model matching aims at searching semantic similarity between models elements, and therefore, facilitating semi-automatic mapping generation. However, current model matching techniques mostly focus on some comparison criteria (i.e., pre-matching effort, input model, output model, quality measures values) while ignore others; in addition these techniques are used in isolation, so that their advantages and commons are not exploited. In this paper, we tackle these issues by proposing a new technique relying on combination of metamodels matching techniques. To reach our goal, schema and ontology matching techniques can be adapted to develop a hybrid technique for metamodel matching. This technique will produce better matching results increasing the mappings quality. © Copyright 2016 by SCITEPRESS - Science and Technology Publications, Lda. All rights reserved.


Boubaker B.B.,ESEO | Assidi M.,University of Lorraine | Ganghoffer J.F.,University of Lorraine
International Journal of Material Forming | Year: 2010

The magnitudes of Poisson's ratios can attain some peculiar values for woven fabrics, in contrast to conventional engineering materials, leading to unusual stress-strain relationships. A mesoscopic discrete model of dry fabric has been presently developed at the scale of the armor, accounting for the yarn-yarn interactions at the yarns crossing points. From a mechanical viewpoint, yarns are modeled as elastic straight bar elements representing stretching springs connected at frictionless hinges by rotational springs. The motion of each node along the yarn is described by a lateral displacement and a local rotation. The reaction force exerted by the transverse yarns at the contact points is calculated from Timoshenko theory, and the work of the reaction forces is incorporated into the structure potential energy. The equilibrium shape of textile structures submitted to external loading is identified as configurations achieving the minimum of the potential energy; a genetic search algorithm has been implemented for the determination of the global minimum of the total potential energy. The transverse behavior of plain weave fabric is evaluated in terms of the Poisson's ratio, based on virtual simulations at the mesoscopic scale of analysis. Poisson's ratio first increases towards a maximum due to the rapid shrinkage of the sample in the transverse direction, and decreases thereafter when the crimp changes are exhausted, with yarn extension as the main deformation mechanism. The influence of the mechanical properties of both warp and weft on Poisson's coefficient is assessed. Scaling laws of the equivalent elastic properties of plain weave versus characteristic geometrical parameters (as the pick spacing) of the plain weave armor are determined. The predictions of the mesoscopic models provide a guideline for the design of woven fabrics. © 2010 Springer-Verlag France.


Monfort V.,University of Paris Dauphine | Hammoudi S.,ESEO
International Journal of e-Business Research | Year: 2011

Service-Oriented Architectures (SOA) are widely used by companies to gain flexibility. Web services are the fitted technical solution used to support SOA by providing interoperability and loose coupling. Basic Web services are being assembled to composite Web services in order to directly support business processes. However, there is much to be done to obtain a genuine flawless Web service, and current market implementations do not provide adaptable Web service behavior depending on the service contract. This paper proposes two different approaches to increase adaptability of Web services and SOA. The first approach is based on Aspect Oriented Programming (AOP) as a new design solution for Web services. The authors have implemented an infrastructure to enrich services with aspects and to dynamically reroute messages according to changes, without redeployment. The second approach combines Model Driven Development (MDD) and Context- Awareness to promote reuse and adaptability of Web services behavior depending on the service context. Parameterized transformation techniques are proposed to bind context with business logic implemented by a service. The aim is to merge the two approaches to abstract and reduce the technical complexity of aspect based service solution. © 2011, IGI Global.


Merhy M.,ESEO | Morel C.,ESEO | Chauveau E.,ESEO | Machmoum M.,37 Boulevard Of Luniversite
Proceedings of the International Conference on Optimisation of Electrical and Electronic Equipment, OPTIM | Year: 2010

Recently, power factor correction (PFC) boost converters have been reported as exhibiting a wide range of bifurcations and chaos under specific conditions [1]. In this paper, we derived a nonlinear model from one point of observation to the next. Analysis of this model shows that chaos and bifurcations may occur along with the changing values of some system parameters. A current-mode controlled PFC boost converter in chaotic behavior is chosen as an application example. A numerical simulation using MATLAB confirms the predicted bifurcations. Finally, a blockset model using Simulink/Matlab is designed to conclude the validity of the numerical simulation. ©2010 IEEE.


Chahine M.A.,ESEO | Perdriau R.,ESEO | Ramdani M.,ESEO | Saleh A.,IUT Saida
2012 2nd International Conference on Advances in Computational Tools for Engineering Applications, ACTEA 2012 | Year: 2012

This paper presents a near field measurement system for the detection of all electromagnetic (EM) field components radiated by microwave devices. This characterization system based on the use of 4 semi-rigid coaxial probes (1 monopoly antenna, 1 differential dipole and 2 differential loops) and a controlled positioning system is power calibrated. It allows the localization of the radiation source in the RF integrated circuit (IC) and the measuring of the EM filed components amplitudes. The amplitude calibration is realized with a FR4 50 Ohms microstrip transmission line. The amplitude calibration of the system with performance factors for each probe is presented for the frequency range of [1MHz - 1GHz]. A comparison between on the one hand, a 3D EM simulation of the entire probe with the standard and on the other side, the measure is presented. © 2012 IEEE.


Hammoudi S.,ESEO | Alouini W.,FST | Lopes D.,Federal University of Maranhão | Huchard M.,Montpellier University
International Journal of Information System Modeling and Design | Year: 2010

Model Driven Engineering (MDE) has been proposed for supporting the development, maintenance and evolution of software systems. Model Driven Architecture (MDA), Software Factories, and the Eclipse Modeling Framework (EMF) are representative MDE approaches. These MDE approaches have concepts and techniques in common such as modeling, metamodels, and model transformation. Today, it is well recognized that model transformation is the most important of MDE approaches and is one of the most important operations in MDE. Despite the multitude of model transformation language proposals emerging from university and industry, these transformations are often created manually, which is a tedious and error-prone task and therefore an expensive process. In this paper, the authors propose an extended architecture that aims to semi-automate the process of transformation in the context of MDA. This architecture involves concepts and techniques of metamodel matching, inspired and borrowed from schema matching techniques that are an important issue in the database and ontology domain. This architecture is enforced by a methodology which details the different steps leading to a semi-automatic transformation process. Matching foundations and the authors' approach for metamodel matching are discussed. Copyright © 2010, IGI Global.


Patent
Eseo and Tagsys | Date: 2013-11-21

The present invention relates to a miniaturized patch antenna assembly in UHF frequency band. The invention is notably useful in RFID applications. The patch antenna assembly includes a multilayered dielectric substrate including at least a top layer, a middle layer and a bottom layer, an electrically conductive patch structure on the upper surface of the top layer, the patch structure having a center point located at the center of patch structure surface and a feeding point electrically coupled to a feed line, a ground plane on the lower surface of the bottom layer. The assembly can include a slot etched in the patch structure, the slot surrounding the center point of the patch structure. This slot aims to concentrate the surface current at the center of the patch structure, which allows reducing its size.

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