There are three types of photovoltaic systems: autonomous systems, hybrid and connected to a netw... more There are three types of photovoltaic systems: autonomous systems, hybrid and connected to a network. This communication proposes an autonomous photovoltaic system. The word standalone refers to the fact that the system works without connecting to a power grid and without cabling (wireless) with limited access to information and resources. Autonomous systems depend solely on solar energy to meet electricity demand. They can contain batteries-which store the energy produced by the modules during the day-for the night or during periods when solar radiation is insufficient. These systems can also meet the needs of an application without the use of batteries. Typically, the stand-alone PV systems are installed where they are the most economical source of electrical energy. The e-case solutions are the simultaneous use of telephone and wireless Internet ,solar electrification in villages and in the city. The objective is to size photovoltaic system in the case of a remote site, autonomous, design and manufacture the antennas ,wifi from recovery equipment, install and maintain a wireless Internet node and wired with solar energy.
Ceux-là qui n'échangent rien ne deviennent rien. (Saint-Exupéry, Citadelle) "Dis-moi et j'oublier... more Ceux-là qui n'échangent rien ne deviennent rien. (Saint-Exupéry, Citadelle) "Dis-moi et j'oublierai, Montre-moi et je me souviendrai, Implique-moi et je comprendrai." "The teacher is not there for the sake of the student; both teacher and student are there for the sake of learning. A. von Humboldt, 1810 "The aim of teaching is simple: it is to make student learning possible." Paul Ramsden, 1992 "True learning is based on discovery guided by mentoring rather than the transmission of knowledge." John Dewey "Learning … is about changing the ways in which learners understand, or experience, or conceptualize the world around them." "Learning is a qualitative change in a person's view of reality."
The purpose of this study was to explore best practices in teaching with Web 2.0 technologies as ... more The purpose of this study was to explore best practices in teaching with Web 2.0 technologies as well as the benefits and barriers associated with the use of Web 2.0. Participants in this study were 14 university instructors who had considerable experience in teaching with Web 2.0 technologies. A Web-based survey was used to collect data for this study. The study results indicate that the major benefits of using Web 2.0 technologies in teaching include (1) interaction, communication and collaboration, (2) knowledge creation, (3) ease of use and flexibility, and (4) writing and technology skills. The major barriers university instructors encounter in teaching with Web 2.0 technologies include (1) uneasiness with openness, (2) technical problems, and (3) time. The survey results also provided insightful guidelines and tips for teaching with Web 2.0 technologies.
Low-density parity-check (LDPC) codes have been shown to have good error correcting performance a... more Low-density parity-check (LDPC) codes have been shown to have good error correcting performance approaching Shannon's limit. Good error correcting performance enables efficient and reliable communication. However, a LDPC code decoding algorithm needs to be executed efficiently to meet cost, time, power and bandwidth requirements of target applications. A joint source-channel decoding method is designed to accelerate the iterative logdomain sum-product decoding procedure of LDPC codes as well as to improve the reconstructed image quality. Error resilience modes are used in the JPEG2000 source codec making it possible to provide useful source decoded information to the channel decoder. After each iteration, a tentative decoding is made and the channel decoded bits are then sent to the JPEG2000 decoder. The positions of bits belonging to error-free coding passes are then fed back to the channel decoder. The log-likelihood ratios (LLR) of these bits are then modified by a weighting factor for the next iteration. By observing the statistics of the decoding procedure, the weighting factor is designed as a function of the channel condition. Results show that the joint decoding method always outperforms the non-source controlled decoding method by up to 2dB in terms of PSNR, and for the irregular code of the PEG code performs much better than the QC code. At the same time, for the regular code the QC code performs as well as the Mackay's and almost as well as PEG codes.
Intitulé : Vers une démarche de qualité et de bonnes pratiques enseignantes des langues pour les ... more Intitulé : Vers une démarche de qualité et de bonnes pratiques enseignantes des langues pour les filières scientifiques .Cas de l'intégration d'outils de simulation ludique et collaborative dédiés à l'apprentissage du FLE/FOS. Résumé : Cette communication vise à échanger les expériences et les bonnes pratiques enseignantes des langues pour les filières scientifiques afin d'asseoir un cadre de référence FOS susceptible d'améliorer les compétences linguistiques et communicatives des étudiants scientifiques. Dans cette optique nous abordons l'intégration d'outils de simulation ludique et collaborative dédiés à l'apprentissage du FOS/FLE. L'évaluation d'une séquence d'apprentissage FOS met en lumière les obstacles à une bonne intégration de ces outils, et permet de mener une réflexion sur les remédiations à mettre en oeuvre conduisant à terme à l'amélioration des pratiques enseignantes des professeurs de langue et terminologie intervenant dans les filières scientifiques.
In recent years, IT's have fascinated many teachers and learners but did they really bring advant... more In recent years, IT's have fascinated many teachers and learners but did they really bring advantages for the learning process?.To what extent are they used? To reach what objectives? What are the new roles for teachers?. This paper deals with the innovative usages of IT's in teaching and addresses the many issues. First ,current and emerging usages of IT's and multimedia in university teaching and learning are dealt with, then two innovative teaching techniques are introduced, namely active pedagogy and problem based learning. The paper concludes with the issue of Integrating IT's in university teaching.
Du point de vue des nouvelles technologies éducatives l'enseignement est une activité de producti... more Du point de vue des nouvelles technologies éducatives l'enseignement est une activité de production (dépositaire de connaissances), de transmission (transmission de connaissances) et de révélation ou stimulation (révéler ou stimuler ce qui repose déjà à demi endormi chez l'apprenant : la vision d'un homme ne prête pas ses ailes à un autre homme) de connaissances par l'enseignant.
In recent years, IT's have fascinated many teachers and learners but did they really bring advant... more In recent years, IT's have fascinated many teachers and learners but did they really bring advantages for the learning process?.To what extent are they used? To reach what objectives? What are the new roles for teachers?. This paper deals with the innovative usages of IT's in teaching and addresses the many issues. First ,current and emerging usages of IT's and multimedia in university teaching and learning are dealt with, then two innovative teaching techniques are introduced, namely active pedagogy and problem based learning . The paper concludes with the issue of Integrating IT's in university teaching.
The main problem of all fractal compression implementations is the execution time. The algorithms... more The main problem of all fractal compression implementations is the execution time. The algorithms can spend hours and hours to compress a single image. So the major variants of the standard algorithm were proposed to speed up computation time. But most of them lead to a bad quality, or a lower compression ratio. For example, the Fisher's proposed classification pattern has greatly accelerated the algorithm, but image quality was poor, due to the search space reduction imposed by the classification, which eliminates a lot of good solutions. By using genetic algorithms to address the problem, we want to optimize the domain blocks search, we explore all domain blocks presents in the image, but not in exhaustive way (like standard algorithm), and without omitting any possible block (solution) like does classification pattern. A genetic algorithm is the unique method to satisfy theses constraints. And it is away to be a random search, because the genetic one is directed by fitness selection which produce optimal solutions. Our goal in this work is to use genetic algorithm to solve the IFS inverse problem, and build a fractal compression algorithm based on genetic optimization of domain blocks search. We have also implemented Barnsley standard algorithm, Y. Fisher algorithm based on classification and the genetic compression algorithm with quadtree partitioning. A population of transformations was evolved for each range block and the result is compared with standard Barnsley algorithm, and Yuval fisher algorithm based classification. We deduced an optimal set of values for the best parameters combination, and we can also specify the best combination for each desired criteria: best compression ratio, best image quality or quick compression process. By running many test images ,we experimentally found the following set of optimal values of all the algorithm parameters which ensure compromise between execution time and solutions optimality : Population Size=100 ; Maximum generations = 20 ; Crossover rate = 0.7 ;Mutation rate = 0.1 ;RMS limit = 5 ; Decomposition error limit = 10 ;Flips and isometrics count = 8. In our proposed algorithm, results were much better than those obtained in both Vences & Rudomin and Marc M. Lankhorst [46] approaches.
—Network congestion is the main reason for packet loss, longer delay in streaming multimedia appl... more —Network congestion is the main reason for packet loss, longer delay in streaming multimedia applications. AODV (Ad hoc on-demand Distance Vector) routing protocol is one of the well-known and efficient on-demand MANET (Mobile Ad-Hoc Networks) protocols. AODV currently does not support Quality of Service (QoS) and has no load balancing mechanism. We present a new solution to achieve better load balancing by introducing, a new procedure to avoid congested nodes and the integration of the concept of traffic load in route discovery process and connectivity management .in this way the least congested path will be chosen by the source node. The performed simulation and comparison between the AODV protocol and AODV-balanced show that this last can improve the QoS in Mobile ad hoc networks under different conditions using NS2 simulator.
In this paper, we present an introduction for the conception of a recognizer for on-line Arabic h... more In this paper, we present an introduction for the conception of a recognizer for on-line Arabic handwriting. Online handwriting recognition of Arabic script is a difficult problem, since it is naturally both cursive and unconstrained. This recognizer permits to interpret a script represented by the pen trajectory. This technique is used notably in the PDA electronic diaries. First of all, we will construct a data base with several scripters. Afterwards, and before attacking the recognition phase, there is a constructional phase of samples of the Arabic characters acquired from an electronic tablet to digitize (NOUN DATABASE).
This paper describes a new approach of classification using genetic programming. The proposed tec... more This paper describes a new approach of classification using genetic programming. The proposed technique consists of genetically coevolving a population of non-linear transformations on the input data to be classified, and map them to a new space with a reduced dimension, in order to get a maximum inter-classes discrimination. The classification of new samples is then performed on the transformed data, and so become much easier. Contrary to the existing GP-classification techniques, the proposed one use a dynamic repartition of the transformed data in separated intervals, the efficacy of a given intervals repartition is handled by the fitness criterion, with a maximum classes discrimination. Experiments were first performed using the Fisher's Iris dataset, and then, the KDD'99 Cup dataset was used to study the intrusion detection and classification problem. Obtained results demonstrate that the proposed genetic approach outperform the existing GP-classification methods [1],[2] and [3], and give a very accepted results compared to other existing techniques proposed in [4],[5],[6],[7] and [8].
This document demonstrates how a face recognition system can be designed with artificial neural n... more This document demonstrates how a face recognition system can be designed with artificial neural network. Note that the training process did not consist of a single call to a training function. Instead, the network was trained several times on various input ideal and noisy images, the images which contents faces. In this case training a network on different sets of noisy images forced the network to learn how to deal with noise, a common problem in the real world.
L'usage exclusif de méthodes traditionnelles ne privilégie pas la transmission de l'information a... more L'usage exclusif de méthodes traditionnelles ne privilégie pas la transmission de l'information au détriment de la formation elle-même. À quoi sert en effet une tête bien pleine si l'apprenant a beaucoup de difficultés à traduire ses connaissances en actes (transferts de connaissances et résolution de problèmes), à communiquer ses idées, à travailler efficacement en équipe, à poursuivre sa formation de façon autonome ?
The virtual learning communities are virtual communities which meet in order to learn or .The mod... more The virtual learning communities are virtual communities which meet in order to learn or .The model of virtual learning community brings together students and trainers. A groupware is a computer system which assists groups of people engaged in a distant common task (or objective). It provides, by an interface, a shared environment. The groupware has clear close links to Computer Supported Cooperative Work (CSCW). This paper attempts to answer the following questions: What are the characteristics of collaborative work as opposed to work done by individuals? How computers can be applied to solve the logistical problems of collaborative work? How designers address problems of systems design that shape social relations?
There are three types of photovoltaic systems: autonomous systems, hybrid and connected to a netw... more There are three types of photovoltaic systems: autonomous systems, hybrid and connected to a network. This communication proposes an autonomous photovoltaic system. The word standalone refers to the fact that the system works without connecting to a power grid and without cabling (wireless) with limited access to information and resources. Autonomous systems depend solely on solar energy to meet electricity demand. They can contain batteries-which store the energy produced by the modules during the day-for the night or during periods when solar radiation is insufficient. These systems can also meet the needs of an application without the use of batteries. Typically, the stand-alone PV systems are installed where they are the most economical source of electrical energy. The e-case solutions are the simultaneous use of telephone and wireless Internet ,solar electrification in villages and in the city. The objective is to size photovoltaic system in the case of a remote site, autonomous, design and manufacture the antennas ,wifi from recovery equipment, install and maintain a wireless Internet node and wired with solar energy.
Ceux-là qui n'échangent rien ne deviennent rien. (Saint-Exupéry, Citadelle) "Dis-moi et j'oublier... more Ceux-là qui n'échangent rien ne deviennent rien. (Saint-Exupéry, Citadelle) "Dis-moi et j'oublierai, Montre-moi et je me souviendrai, Implique-moi et je comprendrai." "The teacher is not there for the sake of the student; both teacher and student are there for the sake of learning. A. von Humboldt, 1810 "The aim of teaching is simple: it is to make student learning possible." Paul Ramsden, 1992 "True learning is based on discovery guided by mentoring rather than the transmission of knowledge." John Dewey "Learning … is about changing the ways in which learners understand, or experience, or conceptualize the world around them." "Learning is a qualitative change in a person's view of reality."
The purpose of this study was to explore best practices in teaching with Web 2.0 technologies as ... more The purpose of this study was to explore best practices in teaching with Web 2.0 technologies as well as the benefits and barriers associated with the use of Web 2.0. Participants in this study were 14 university instructors who had considerable experience in teaching with Web 2.0 technologies. A Web-based survey was used to collect data for this study. The study results indicate that the major benefits of using Web 2.0 technologies in teaching include (1) interaction, communication and collaboration, (2) knowledge creation, (3) ease of use and flexibility, and (4) writing and technology skills. The major barriers university instructors encounter in teaching with Web 2.0 technologies include (1) uneasiness with openness, (2) technical problems, and (3) time. The survey results also provided insightful guidelines and tips for teaching with Web 2.0 technologies.
Low-density parity-check (LDPC) codes have been shown to have good error correcting performance a... more Low-density parity-check (LDPC) codes have been shown to have good error correcting performance approaching Shannon's limit. Good error correcting performance enables efficient and reliable communication. However, a LDPC code decoding algorithm needs to be executed efficiently to meet cost, time, power and bandwidth requirements of target applications. A joint source-channel decoding method is designed to accelerate the iterative logdomain sum-product decoding procedure of LDPC codes as well as to improve the reconstructed image quality. Error resilience modes are used in the JPEG2000 source codec making it possible to provide useful source decoded information to the channel decoder. After each iteration, a tentative decoding is made and the channel decoded bits are then sent to the JPEG2000 decoder. The positions of bits belonging to error-free coding passes are then fed back to the channel decoder. The log-likelihood ratios (LLR) of these bits are then modified by a weighting factor for the next iteration. By observing the statistics of the decoding procedure, the weighting factor is designed as a function of the channel condition. Results show that the joint decoding method always outperforms the non-source controlled decoding method by up to 2dB in terms of PSNR, and for the irregular code of the PEG code performs much better than the QC code. At the same time, for the regular code the QC code performs as well as the Mackay's and almost as well as PEG codes.
Intitulé : Vers une démarche de qualité et de bonnes pratiques enseignantes des langues pour les ... more Intitulé : Vers une démarche de qualité et de bonnes pratiques enseignantes des langues pour les filières scientifiques .Cas de l'intégration d'outils de simulation ludique et collaborative dédiés à l'apprentissage du FLE/FOS. Résumé : Cette communication vise à échanger les expériences et les bonnes pratiques enseignantes des langues pour les filières scientifiques afin d'asseoir un cadre de référence FOS susceptible d'améliorer les compétences linguistiques et communicatives des étudiants scientifiques. Dans cette optique nous abordons l'intégration d'outils de simulation ludique et collaborative dédiés à l'apprentissage du FOS/FLE. L'évaluation d'une séquence d'apprentissage FOS met en lumière les obstacles à une bonne intégration de ces outils, et permet de mener une réflexion sur les remédiations à mettre en oeuvre conduisant à terme à l'amélioration des pratiques enseignantes des professeurs de langue et terminologie intervenant dans les filières scientifiques.
In recent years, IT's have fascinated many teachers and learners but did they really bring advant... more In recent years, IT's have fascinated many teachers and learners but did they really bring advantages for the learning process?.To what extent are they used? To reach what objectives? What are the new roles for teachers?. This paper deals with the innovative usages of IT's in teaching and addresses the many issues. First ,current and emerging usages of IT's and multimedia in university teaching and learning are dealt with, then two innovative teaching techniques are introduced, namely active pedagogy and problem based learning. The paper concludes with the issue of Integrating IT's in university teaching.
Du point de vue des nouvelles technologies éducatives l'enseignement est une activité de producti... more Du point de vue des nouvelles technologies éducatives l'enseignement est une activité de production (dépositaire de connaissances), de transmission (transmission de connaissances) et de révélation ou stimulation (révéler ou stimuler ce qui repose déjà à demi endormi chez l'apprenant : la vision d'un homme ne prête pas ses ailes à un autre homme) de connaissances par l'enseignant.
In recent years, IT's have fascinated many teachers and learners but did they really bring advant... more In recent years, IT's have fascinated many teachers and learners but did they really bring advantages for the learning process?.To what extent are they used? To reach what objectives? What are the new roles for teachers?. This paper deals with the innovative usages of IT's in teaching and addresses the many issues. First ,current and emerging usages of IT's and multimedia in university teaching and learning are dealt with, then two innovative teaching techniques are introduced, namely active pedagogy and problem based learning . The paper concludes with the issue of Integrating IT's in university teaching.
The main problem of all fractal compression implementations is the execution time. The algorithms... more The main problem of all fractal compression implementations is the execution time. The algorithms can spend hours and hours to compress a single image. So the major variants of the standard algorithm were proposed to speed up computation time. But most of them lead to a bad quality, or a lower compression ratio. For example, the Fisher's proposed classification pattern has greatly accelerated the algorithm, but image quality was poor, due to the search space reduction imposed by the classification, which eliminates a lot of good solutions. By using genetic algorithms to address the problem, we want to optimize the domain blocks search, we explore all domain blocks presents in the image, but not in exhaustive way (like standard algorithm), and without omitting any possible block (solution) like does classification pattern. A genetic algorithm is the unique method to satisfy theses constraints. And it is away to be a random search, because the genetic one is directed by fitness selection which produce optimal solutions. Our goal in this work is to use genetic algorithm to solve the IFS inverse problem, and build a fractal compression algorithm based on genetic optimization of domain blocks search. We have also implemented Barnsley standard algorithm, Y. Fisher algorithm based on classification and the genetic compression algorithm with quadtree partitioning. A population of transformations was evolved for each range block and the result is compared with standard Barnsley algorithm, and Yuval fisher algorithm based classification. We deduced an optimal set of values for the best parameters combination, and we can also specify the best combination for each desired criteria: best compression ratio, best image quality or quick compression process. By running many test images ,we experimentally found the following set of optimal values of all the algorithm parameters which ensure compromise between execution time and solutions optimality : Population Size=100 ; Maximum generations = 20 ; Crossover rate = 0.7 ;Mutation rate = 0.1 ;RMS limit = 5 ; Decomposition error limit = 10 ;Flips and isometrics count = 8. In our proposed algorithm, results were much better than those obtained in both Vences & Rudomin and Marc M. Lankhorst [46] approaches.
—Network congestion is the main reason for packet loss, longer delay in streaming multimedia appl... more —Network congestion is the main reason for packet loss, longer delay in streaming multimedia applications. AODV (Ad hoc on-demand Distance Vector) routing protocol is one of the well-known and efficient on-demand MANET (Mobile Ad-Hoc Networks) protocols. AODV currently does not support Quality of Service (QoS) and has no load balancing mechanism. We present a new solution to achieve better load balancing by introducing, a new procedure to avoid congested nodes and the integration of the concept of traffic load in route discovery process and connectivity management .in this way the least congested path will be chosen by the source node. The performed simulation and comparison between the AODV protocol and AODV-balanced show that this last can improve the QoS in Mobile ad hoc networks under different conditions using NS2 simulator.
In this paper, we present an introduction for the conception of a recognizer for on-line Arabic h... more In this paper, we present an introduction for the conception of a recognizer for on-line Arabic handwriting. Online handwriting recognition of Arabic script is a difficult problem, since it is naturally both cursive and unconstrained. This recognizer permits to interpret a script represented by the pen trajectory. This technique is used notably in the PDA electronic diaries. First of all, we will construct a data base with several scripters. Afterwards, and before attacking the recognition phase, there is a constructional phase of samples of the Arabic characters acquired from an electronic tablet to digitize (NOUN DATABASE).
This paper describes a new approach of classification using genetic programming. The proposed tec... more This paper describes a new approach of classification using genetic programming. The proposed technique consists of genetically coevolving a population of non-linear transformations on the input data to be classified, and map them to a new space with a reduced dimension, in order to get a maximum inter-classes discrimination. The classification of new samples is then performed on the transformed data, and so become much easier. Contrary to the existing GP-classification techniques, the proposed one use a dynamic repartition of the transformed data in separated intervals, the efficacy of a given intervals repartition is handled by the fitness criterion, with a maximum classes discrimination. Experiments were first performed using the Fisher's Iris dataset, and then, the KDD'99 Cup dataset was used to study the intrusion detection and classification problem. Obtained results demonstrate that the proposed genetic approach outperform the existing GP-classification methods [1],[2] and [3], and give a very accepted results compared to other existing techniques proposed in [4],[5],[6],[7] and [8].
This document demonstrates how a face recognition system can be designed with artificial neural n... more This document demonstrates how a face recognition system can be designed with artificial neural network. Note that the training process did not consist of a single call to a training function. Instead, the network was trained several times on various input ideal and noisy images, the images which contents faces. In this case training a network on different sets of noisy images forced the network to learn how to deal with noise, a common problem in the real world.
L'usage exclusif de méthodes traditionnelles ne privilégie pas la transmission de l'information a... more L'usage exclusif de méthodes traditionnelles ne privilégie pas la transmission de l'information au détriment de la formation elle-même. À quoi sert en effet une tête bien pleine si l'apprenant a beaucoup de difficultés à traduire ses connaissances en actes (transferts de connaissances et résolution de problèmes), à communiquer ses idées, à travailler efficacement en équipe, à poursuivre sa formation de façon autonome ?
The virtual learning communities are virtual communities which meet in order to learn or .The mod... more The virtual learning communities are virtual communities which meet in order to learn or .The model of virtual learning community brings together students and trainers. A groupware is a computer system which assists groups of people engaged in a distant common task (or objective). It provides, by an interface, a shared environment. The groupware has clear close links to Computer Supported Cooperative Work (CSCW). This paper attempts to answer the following questions: What are the characteristics of collaborative work as opposed to work done by individuals? How computers can be applied to solve the logistical problems of collaborative work? How designers address problems of systems design that shape social relations?
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