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Raies K.,University of Sfax | Rebhi K.,Higher Institute of Management | Khemeja M.,Higher Institute of Applied science and Technology of Sousse | Khemeja M.,University of Sousse
CEUR Workshop Proceedings | Year: 2014

Game Based Learning Systems (GBLSs) constitute an important resource for entertainment and education, they present an efficient technology that uses game principles to engage learners into learning activities. However, several barriers are in the way of the general adoption of learning approaches based on GBLSs, since their design process requires strict and precise specification models to define and communicate gameplay. For instance, until very recently, gameplay is usually specified via natural language rules introducing and generating thus many ambiguous human interpretations and a lack of machine understandable formats. In this paper, we present a formal as well as a semantic formalism based on domain ontology for gameplay specification that offers to game designers a precise model to describe, analyze and communicate gameplay from early stages of development. Moreover this semantic formalism is more machine understandable which could allow more automatic processing and reasoning over the specified gameplay. ©20i4 by the papers authors.


Hassen M.,Higher Institute of Applied Science and Technology of Sousse | Maaloul N.K.,Gabes University | Khirouni K.,Gabes University
Journal of Alloys and Compounds | Year: 2016

The silicon nanocrystals (Si NCs) are fabricated on a porous alumina (PAl) matrix by PECVD technique at different deposition time (dt) in order to produce PAlSi thin films with a high crystallinity. In this work, we report a correlation between microstructural and optical characterizations of PAlSi alloy in term of volumic Si NCs fraction and mainly the Si NCs sizes. The morphology and structure of the samples were characterized using scanning electron microscopy (SEM), atomic force microscopy (AFM), energy dispersive X-ray spectroscopy (EDX), X-Ray Diffraction (XRD) technique, and Raman spectroscopy. Optical properties of the microstructure were studied using spectroscopic ellipsometry (SE) data. Based on the SE data, an appropriate optical model is used to describe the PAlSi content with various volumic fraction of Si NCs. Bruggeman effective medium approximation and Forouhi-Bloomer models are used to analyze the effects of the volumic crystalline Si fraction on the optical properties of PAlSi, such as the refractive index (n), extinction coefficient (k) and energy band gap (Eg), as well as the dielectric functions. We show that the crystallization process is strongly dependent on the degree or the volumetric fractions of Si NCs embedded in a PAl matrix. © 2015 Published by Elsevier B.V.


Laatar F.,Center for Research and Technology Energy | Harizi A.,Tunis el Manar University | Smida A.,Center for Research and Technology Energy | Hassen M.,Center for Research and Technology Energy | And 2 more authors.
Materials Research Bulletin | Year: 2016

Cadmium selenide quantum dots (CdSe QDs) thin films were deposited onto glass substrates by a chemical bath deposition (CBD) method at different temperatures from an aqueous solution containing l-Cysteine (l-Cys) as capping agent. The evolution of the surface morphology and elemental composition of the CdSe films were studied by AFM, SEM, and EDX analyses. Structural and optical properties of CdSe thin films were investigated by XRD, UV-vis and PL spectroscopy. The dispersion behavior of the refractive index is described using the single oscillator Wemple-DiDomenico (W-D) model, and the physical dispersion parameters are calculated as a function of deposition temperature. The dispersive optical parameters such as average oscillator energy (Eo), dispersion energy (Ed), and static refractive index (no) were found to vary with the deposition temperature. Besides, the electrical free carrier susceptibility (χe) and the carrier concentration of the effective mass ratio (N/m∗) were evaluated according to the Spitzer-Fan model. © 2016 Elsevier Ltd. All rights reserved.


Smida A.,Center for Research and Technology Energy | Laatar F.,Center for Research and Technology Energy | Hassen M.,Center for Research and Technology Energy | Hassen M.,Higher Institute of Applied Science and Technology of Sousse | Ezzaouia H.,Center for Research and Technology Energy
Journal of Luminescence | Year: 2016

This paper consists to present first results concerning the structure of porous GaAs layer (por-GaAs-L) prepared by using HF/HNO3 as acidic solution in vapor etching (VE) method. In order to clarify this method, we detail here its principle and explain how por-GaAs-Ls are formed, taking into account the influencing of the exposure time of the GaAs substrate to the acid vapor. The etched GaAs layers have been investigated by UV-visible and PL analysis. One porous layer was performed to be characterised by Atomic Force Microscopy (AFM), FTIR spectroscopy, and X-Ray Diffraction (XRD). The porous structure was constituted by a nanocrystals with an average size about 6 nm. These nanocrystals were calculated from XRD peak using Scherrer's formula, AFM imaging, and also by using effective mass approximation model from effective band gap. © 2016 Elsevier B.V. All rights reserved.


Chatti S.,Higher Institute of Applied Science and Technology of Sousse
International Journal of Material Forming | Year: 2013

It was already stated that springback in sheet metal forming strongly depends on the elastic properties. Several experimental investigations have revealed that the elastic modulus decreases as the plastic strain increases. Two approaches have been separately employed to explain this phenomenon: dislocations rearrangements and damage. These approaches are considered in a proposed elastoplastic model coupled with damage based on Lemaitre type isotropic ductile damage law. In addition, a hysteresis aspect, which is experimentally observed during unloading-reloading stages, is also considered. Uniaxial tension tests have been used and the predicted results agree well with published experimental data. The proposed model is intended to be implemented in FEM codes for reliable results in forming processes including springback. © 2011 Springer-Verlag France.


Bouallegue K.,Higher Institute of Applied science and Technology of Sousse
International Journal of Bifurcation and Chaos | Year: 2015

During the last decade, fractal processes and chaotic systems were widely studied in many areas of research. Chaotic systems are highly dependent on initial conditions. Small changes in initial conditions can generate widely diverging or converging outcomes for both bifurcation or attraction in chaotic systems. In this work, we present a new method on how to generate a new family of chaotic attractors by combining these with a network of fractal processes. The proposed approach in this article is based upon the construction of a new system of fractal processes. © 2015 World Scientific Publishing Company.


Landolsi H.,Informatics for Industrial Systems Laboratory | Marzouki K.,Informatics for Industrial Systems Laboratory | Marzouki K.,Higher Institute of Applied Science and Technology of Sousse
IEEE SSCI 2014 - 2014 IEEE Symposium Series on Computational Intelligence - CCMB 2014: 2014 IEEE Symposium on Computational Intelligence, Cognitive Algorithms, Mind, and Brain, Proceedings | Year: 2014

More convincing evidence has proven the existence of a bidirectional relationship between neurons and astrocytes. Assume now that astrocytes, a new type of glial cells previously considered as passive cells of support, constitute a system of nonsynaptic transmission plays a major role in modulating the activity of neurons. In this context, we proposed to model the effect of these cells to develop a new type of artificial neural network operating on new mechanisms to improve the information processing and reduce learning time, very expensive in traditional networks. The obtained results indicate that the implementation of bio-inspired functions such as of astrocytes, improve very considerably learning speed. The developed model achieves learning up to twelve times faster than traditional artificial neural networks. © 2014 IEEE.


Bouallegue K.,Higher Institute of Applied science and Technology of Sousse
Chaos | Year: 2015

This paper proposes a new behavior of chaotic attractors with separated scrolls while combining Julia's process with Chua's attractor and Lorenz's attractor. The main motivation of this work is the ability to generate a set of separated scrolls with different behaviors, which in turn allows us to choose one or many scrolls combined with modulation (amplitude and frequency) for secure communication or synchronization. This set seems a new class of hyperchaos because each element of this set looks like a simple chaotic attractor with one positive Lyapunov exponent, so the cardinal of this set is greater than one. This new approach could be used to generate more general higher-dimensional hyperchaotic attractor for more potential application. Numerical simulations are given to show the effectiveness of the proposed theoretical results. © 2015 AIP Publishing LLC.


Tlili S.,Higher Institute of Computer science of Medenine | Mibar H.,Higher Institute of Applied science and Technology of Sousse
International Review of Automatic Control | Year: 2012

This paper presents a class of uncertain discrete time Single intput Single output (SISO) or multi-input-multi-output (MIMO) nonlinear dynamics systems whose states are available. The objective of this article is to propose the use of polytopic uncertainty in order to approximate a nonlinear system by a family of uncertain linear systems. This approach makes it possible to determine sequences robust laws of control guaranteeing quadratic and polyquadratic stability and take into account certain specifications of local performances. These laws are defined in a vicinity of attraction of the equilibriums points around whose the approximation of non-linearity was carried out. The example will be exposed making it possible to display the results. © 2012 Praise Worthy Prize S.r.l. - All rights reserved.


PubMed | Higher Institute of Applied science and Technology of Sousse
Type: Journal Article | Journal: Chaos (Woodbury, N.Y.) | Year: 2015

This paper proposes a new behavior of chaotic attractors with separated scrolls while combining Julias process with Chuas attractor and Lorenzs attractor. The main motivation of this work is the ability to generate a set of separated scrolls with different behaviors, which in turn allows us to choose one or many scrolls combined with modulation (amplitude and frequency) for secure communication or synchronization. This set seems a new class of hyperchaos because each element of this set looks like a simple chaotic attractor with one positive Lyapunov exponent, so the cardinal of this set is greater than one. This new approach could be used to generate more general higher-dimensional hyperchaotic attractor for more potential application. Numerical simulations are given to show the effectiveness of the proposed theoretical results.

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