Lassaad Baati - Academia.edu (original) (raw)
Papers by Lassaad Baati
La modélisation des structures variables devient cruciale pour la modélisation des systèmes dynam... more La modélisation des structures variables devient cruciale pour la modélisation des systèmes dynamiques. En effet, au delà de la dynamique du comportement, les modèles nécessitent un changement plus profond (de structure) pour mieux représenter la dynamique de certains systè-mes. Dans le but de résoudre les interrogations liées à la modélisation des structures dynami-ques Diverses approches ont été fournies. Nous proposons « une approche de modélisation DEVS à structure hiérarchique et dynamique », qui préserve le formalisme DEVS et permet une modélisation à structure dynamique à travers un modèle DEVS atomique (modèle de structure), ensuite nous décrivons le simulateur abstrait relatif à cette approche. Mots-clés : Modélisation et simulation à événement discret, DEVS, structure variable/ dynamique, Structure hiérarchique, simulateur abstrait.
Summer Computer Simulation Conference, 2007
ABSTRACT Low intensity conflicts (LIC) become crucial in military operations. They are situations... more ABSTRACT Low intensity conflicts (LIC) become crucial in military operations. They are situations where contending groups are involved in a confrontation below the level of conventional war. To protect minorities and maintain or restore an acceptable level of peace a military force can be employed. Such a system is principally characterised by the importance of the interactions between and within factions. Salient properties of these interactions are their asymmetry, their effects at different scales and their dynamic nature. The multi-agent paradigm and the dynamic structure system are particularly suitable ways to represent a system with such characteristics. This paper proposes a Discrete EVents Specification (DEVS) of autonomous agents and uses a related dynamic hierarchical structure approach to enable more realistic training of military personnel and scenario analysis.
La modélisation des structures variables devient cruciale pour la modélisation des systèmes dynam... more La modélisation des structures variables devient cruciale pour la modélisation des systèmes dynamiques. En effet, au delà de la dynamique du comportement, les modèles nécessitent un changement plus profond (de structure) pour mieux représenter la dynamique de certains systèmes. Dans le but de résoudre les interrogations liées à la modélisation des structures dynamiques Diverses approches ont été fournies. Nous proposons « une approche de modélisation DEVS à structure hiérarchique et dynamique », qui préserve le formalisme DEVS et permet une modélisation à structure dynamique à travers un modèle DEVS atomique (modèle de structure), ensuite nous décrivons le simulateur abstrait relatif à cette approche.
In recent years, human behavior simulation has been an active field of research, and various appr... more In recent years, human behavior simulation has been an active field of research, and various approaches have been used. One of the main challenges is to design models that capture more of the subtleties of human nature to reach a higher level of realism. In this paper, we present the premises of a DEVS (Discrete Event System Specification) based framework for the modeling and simulation of human behavior for CGFs (Computer Generated Forces). We introduce a simplified way of specifying models for the simulation of human behavior. In fact, our focus is to give to the modeler the possibility to represent behavior influenced by certain human factors by fine tuning the proposed models or by extending them with new moderator functions. As an example, we present DEVS models of military behavior as defined in the rules of engagement but moderated by human factors such as personality and stress. We hope to obtain eventually more accurate and realistic models.
Http Www Theses Fr, 2008
La modelisation des structures variables devient cruciale pour la modelisation fidele ses systeme... more La modelisation des structures variables devient cruciale pour la modelisation fidele ses systemes dynamiques complexes. Dans le cadre de la modelisation a evenement discret DEVS, diverses solutions ont ete apportees. Elles preconisent ou bien l'alteration du formalisme classique DEVS en ajoutant des fonctions et des parametres qui changent sa semantique, ou bien un melange entre donnees de comportement et donnees de structure. Dans cette optique, nous proposons une approche de modelisatiion DEVS a structure hierarchique et dynamique, qui preserve ce formalisme dans le but de profiter de ses proprietes deja demontees (fermeture sur le couplage), et de l'experience acquise par son utilisation. Ensuite, nous presentons l'application de cette approche dans l'implementation d'un CGF (le projet PIOVRA).
Proceedings of the 2010 Spring Simulation Multiconference on - SpringSim '10, 2010
ABSTRACT
The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology, 2007
In recent years, human behavior simulation has been an active field of research, and various appr... more In recent years, human behavior simulation has been an active field of research, and various approaches have been used. One of the main challenges is to design models that capture more of the subtleties of human nature to reach a higher level of realism. In this paper, we present the premises of a DEVS (Discrete Event System Specification) based framework for the modeling and simulation of human behavior for CGFs (Computer Generated Forces). We introduce a simplified way of specifying models for the simulation of human behavior. In fact, our focus is to give to the modeler the possibility to represent behavior influenced by certain human factors by fine tuning the proposed models or by extending them with new moderator functions. As an example, we present DEVS models of military behavior as defined in the rules of engagement but moderated by human factors such as personality and stress. We hope to obtain eventually more accurate and realistic models.
Modeling and simulation becomes crucial in analyzing dynamic system behavior. Many formalisms and... more Modeling and simulation becomes crucial in analyzing dynamic system behavior. Many formalisms and methods are introduced in order to improve this process. The effort is twofold; a) reach more realistic models and results, b) obtain "simplified, flexible" models. Efforts are conducted to adapt formalisms to several domains and features. In our work, we are interested in the structure variability especially in DEVS modeling formalism. Structure variability allows models to be adapted to different situations along simulation. We proposed a dynamic hierarchical structure modeling approach and the corresponding algorithm based on the abstract simulator. This paper presents an implementation in an M&S environment.
Modeling and simulation becomes crucial in analyzing dynamic system behavior. Many formalisms and... more Modeling and simulation becomes crucial in analyzing dynamic system behavior. Many formalisms and methods are introduced in order to improve this process. The effort is twofold; a) reach more realistic models and results, b) obtain "simplified, flexible" models. Efforts are conducted to adapt formalisms to several domains and features. In our work, we are interested in the structure variability especially in DEVS modeling formalism. Structure variability allows models to be adapted to different situations along simulation. We proposed a dynamic hierarchical structure modeling approach and the corresponding algorithm based on the abstract simulator. This paper presents an implementation in an M&S environment.
ABSTRACT Low intensity conflicts (LIC) become crucial in military operations. They are situations... more ABSTRACT Low intensity conflicts (LIC) become crucial in military operations. They are situations where contending groups are involved in a confrontation below the level of conventional war. To protect minorities and maintain or restore an acceptable level of peace a military force can be employed. Such a system is principally characterised by the importance of the interactions between and within factions. Salient properties of these interactions are their asymmetry, their effects at different scales and their dynamic nature. The multi-agent paradigm and the dynamic structure system are particularly suitable ways to represent a system with such characteristics. This paper proposes a Discrete EVents Specification (DEVS) of autonomous agents and uses a related dynamic hierarchical structure approach to enable more realistic training of military personnel and scenario analysis.
ABSTRACT Modeling and simulation becomes crucial in analyzing dynamic system behavior. Many forma... more ABSTRACT Modeling and simulation becomes crucial in analyzing dynamic system behavior. Many formalisms and methods are introduced in order to improve this process. The effort is twofold; a) reach more realistic models and results, b) obtain "simplified, flexible" models. Efforts are conducted to adapt formalisms to several domains and features. In our work, we are interested in the structure variability especially in DEVS modeling formalism. Structure variability allows models to be adapted to different situations along simulation. We proposed a dynamic hierarchical structure modeling approach and the corresponding algorithm based on the abstract simulator. This paper presents an implementation in an M&S environment.
The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology, 2007
In recent years, human behavior simulation has been an active field of research, and various appr... more In recent years, human behavior simulation has been an active field of research, and various approaches have been used. One of the main challenges is to design models that capture more of the subtleties of human nature to reach a higher level of realism. In this paper, we present the premises of a DEVS (Discrete Event System Specification) based framework for the modeling and simulation of human behavior for CGFs (Computer Generated Forces). We introduce a simplified way of specifying models for the simulation of human behavior. In fact, our focus is to give to the modeler the possibility to represent behavior influenced by certain human factors by fine tuning the proposed models or by extending them with new moderator functions. As an example, we present DEVS models of military behavior as defined in the rules of engagement but moderated by human factors such as personality and stress. We hope to obtain eventually more accurate and realistic models.
Mathematics and Computers in Simulation, 2004
We present modelling software developed under MATLAB in which parameter estimations are obtained ... more We present modelling software developed under MATLAB in which parameter estimations are obtained by using non-linear regression techniques. The different parameters appear in a set of non-linear algebraic and differential equations representing the model of the process. From experimental data obtained in discontinuous cultures a representative mathematical model (unstructured kinetic model) of the macroscopic behaviour of Lactobacillus acidophilus has been developed. An unstructured model expressed the specific rates of cell growth, lactic acid production and glucose consumption for batch fermentation. The model is formulated by considering the inhibition of growth under sub-optimal culture conditions during Lactobacillus acidophilus fermentation, which is accompanied by an increase of the maintenance energy. This study permits to predict the cellular behaviour at low growth temperatures and enables to define the response of the strain to sub-optimal temperature stress.
La modélisation des structures variables devient cruciale pour la modélisation des systèmes dynam... more La modélisation des structures variables devient cruciale pour la modélisation des systèmes dynamiques. En effet, au delà de la dynamique du comportement, les modèles nécessitent un changement plus profond (de structure) pour mieux représenter la dynamique de certains systè-mes. Dans le but de résoudre les interrogations liées à la modélisation des structures dynami-ques Diverses approches ont été fournies. Nous proposons « une approche de modélisation DEVS à structure hiérarchique et dynamique », qui préserve le formalisme DEVS et permet une modélisation à structure dynamique à travers un modèle DEVS atomique (modèle de structure), ensuite nous décrivons le simulateur abstrait relatif à cette approche. Mots-clés : Modélisation et simulation à événement discret, DEVS, structure variable/ dynamique, Structure hiérarchique, simulateur abstrait.
Summer Computer Simulation Conference, 2007
ABSTRACT Low intensity conflicts (LIC) become crucial in military operations. They are situations... more ABSTRACT Low intensity conflicts (LIC) become crucial in military operations. They are situations where contending groups are involved in a confrontation below the level of conventional war. To protect minorities and maintain or restore an acceptable level of peace a military force can be employed. Such a system is principally characterised by the importance of the interactions between and within factions. Salient properties of these interactions are their asymmetry, their effects at different scales and their dynamic nature. The multi-agent paradigm and the dynamic structure system are particularly suitable ways to represent a system with such characteristics. This paper proposes a Discrete EVents Specification (DEVS) of autonomous agents and uses a related dynamic hierarchical structure approach to enable more realistic training of military personnel and scenario analysis.
La modélisation des structures variables devient cruciale pour la modélisation des systèmes dynam... more La modélisation des structures variables devient cruciale pour la modélisation des systèmes dynamiques. En effet, au delà de la dynamique du comportement, les modèles nécessitent un changement plus profond (de structure) pour mieux représenter la dynamique de certains systèmes. Dans le but de résoudre les interrogations liées à la modélisation des structures dynamiques Diverses approches ont été fournies. Nous proposons « une approche de modélisation DEVS à structure hiérarchique et dynamique », qui préserve le formalisme DEVS et permet une modélisation à structure dynamique à travers un modèle DEVS atomique (modèle de structure), ensuite nous décrivons le simulateur abstrait relatif à cette approche.
In recent years, human behavior simulation has been an active field of research, and various appr... more In recent years, human behavior simulation has been an active field of research, and various approaches have been used. One of the main challenges is to design models that capture more of the subtleties of human nature to reach a higher level of realism. In this paper, we present the premises of a DEVS (Discrete Event System Specification) based framework for the modeling and simulation of human behavior for CGFs (Computer Generated Forces). We introduce a simplified way of specifying models for the simulation of human behavior. In fact, our focus is to give to the modeler the possibility to represent behavior influenced by certain human factors by fine tuning the proposed models or by extending them with new moderator functions. As an example, we present DEVS models of military behavior as defined in the rules of engagement but moderated by human factors such as personality and stress. We hope to obtain eventually more accurate and realistic models.
Http Www Theses Fr, 2008
La modelisation des structures variables devient cruciale pour la modelisation fidele ses systeme... more La modelisation des structures variables devient cruciale pour la modelisation fidele ses systemes dynamiques complexes. Dans le cadre de la modelisation a evenement discret DEVS, diverses solutions ont ete apportees. Elles preconisent ou bien l'alteration du formalisme classique DEVS en ajoutant des fonctions et des parametres qui changent sa semantique, ou bien un melange entre donnees de comportement et donnees de structure. Dans cette optique, nous proposons une approche de modelisatiion DEVS a structure hierarchique et dynamique, qui preserve ce formalisme dans le but de profiter de ses proprietes deja demontees (fermeture sur le couplage), et de l'experience acquise par son utilisation. Ensuite, nous presentons l'application de cette approche dans l'implementation d'un CGF (le projet PIOVRA).
Proceedings of the 2010 Spring Simulation Multiconference on - SpringSim '10, 2010
ABSTRACT
The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology, 2007
In recent years, human behavior simulation has been an active field of research, and various appr... more In recent years, human behavior simulation has been an active field of research, and various approaches have been used. One of the main challenges is to design models that capture more of the subtleties of human nature to reach a higher level of realism. In this paper, we present the premises of a DEVS (Discrete Event System Specification) based framework for the modeling and simulation of human behavior for CGFs (Computer Generated Forces). We introduce a simplified way of specifying models for the simulation of human behavior. In fact, our focus is to give to the modeler the possibility to represent behavior influenced by certain human factors by fine tuning the proposed models or by extending them with new moderator functions. As an example, we present DEVS models of military behavior as defined in the rules of engagement but moderated by human factors such as personality and stress. We hope to obtain eventually more accurate and realistic models.
Modeling and simulation becomes crucial in analyzing dynamic system behavior. Many formalisms and... more Modeling and simulation becomes crucial in analyzing dynamic system behavior. Many formalisms and methods are introduced in order to improve this process. The effort is twofold; a) reach more realistic models and results, b) obtain "simplified, flexible" models. Efforts are conducted to adapt formalisms to several domains and features. In our work, we are interested in the structure variability especially in DEVS modeling formalism. Structure variability allows models to be adapted to different situations along simulation. We proposed a dynamic hierarchical structure modeling approach and the corresponding algorithm based on the abstract simulator. This paper presents an implementation in an M&S environment.
Modeling and simulation becomes crucial in analyzing dynamic system behavior. Many formalisms and... more Modeling and simulation becomes crucial in analyzing dynamic system behavior. Many formalisms and methods are introduced in order to improve this process. The effort is twofold; a) reach more realistic models and results, b) obtain "simplified, flexible" models. Efforts are conducted to adapt formalisms to several domains and features. In our work, we are interested in the structure variability especially in DEVS modeling formalism. Structure variability allows models to be adapted to different situations along simulation. We proposed a dynamic hierarchical structure modeling approach and the corresponding algorithm based on the abstract simulator. This paper presents an implementation in an M&S environment.
ABSTRACT Low intensity conflicts (LIC) become crucial in military operations. They are situations... more ABSTRACT Low intensity conflicts (LIC) become crucial in military operations. They are situations where contending groups are involved in a confrontation below the level of conventional war. To protect minorities and maintain or restore an acceptable level of peace a military force can be employed. Such a system is principally characterised by the importance of the interactions between and within factions. Salient properties of these interactions are their asymmetry, their effects at different scales and their dynamic nature. The multi-agent paradigm and the dynamic structure system are particularly suitable ways to represent a system with such characteristics. This paper proposes a Discrete EVents Specification (DEVS) of autonomous agents and uses a related dynamic hierarchical structure approach to enable more realistic training of military personnel and scenario analysis.
ABSTRACT Modeling and simulation becomes crucial in analyzing dynamic system behavior. Many forma... more ABSTRACT Modeling and simulation becomes crucial in analyzing dynamic system behavior. Many formalisms and methods are introduced in order to improve this process. The effort is twofold; a) reach more realistic models and results, b) obtain "simplified, flexible" models. Efforts are conducted to adapt formalisms to several domains and features. In our work, we are interested in the structure variability especially in DEVS modeling formalism. Structure variability allows models to be adapted to different situations along simulation. We proposed a dynamic hierarchical structure modeling approach and the corresponding algorithm based on the abstract simulator. This paper presents an implementation in an M&S environment.
The Journal of Defense Modeling and Simulation: Applications, Methodology, Technology, 2007
In recent years, human behavior simulation has been an active field of research, and various appr... more In recent years, human behavior simulation has been an active field of research, and various approaches have been used. One of the main challenges is to design models that capture more of the subtleties of human nature to reach a higher level of realism. In this paper, we present the premises of a DEVS (Discrete Event System Specification) based framework for the modeling and simulation of human behavior for CGFs (Computer Generated Forces). We introduce a simplified way of specifying models for the simulation of human behavior. In fact, our focus is to give to the modeler the possibility to represent behavior influenced by certain human factors by fine tuning the proposed models or by extending them with new moderator functions. As an example, we present DEVS models of military behavior as defined in the rules of engagement but moderated by human factors such as personality and stress. We hope to obtain eventually more accurate and realistic models.
Mathematics and Computers in Simulation, 2004
We present modelling software developed under MATLAB in which parameter estimations are obtained ... more We present modelling software developed under MATLAB in which parameter estimations are obtained by using non-linear regression techniques. The different parameters appear in a set of non-linear algebraic and differential equations representing the model of the process. From experimental data obtained in discontinuous cultures a representative mathematical model (unstructured kinetic model) of the macroscopic behaviour of Lactobacillus acidophilus has been developed. An unstructured model expressed the specific rates of cell growth, lactic acid production and glucose consumption for batch fermentation. The model is formulated by considering the inhibition of growth under sub-optimal culture conditions during Lactobacillus acidophilus fermentation, which is accompanied by an increase of the maintenance energy. This study permits to predict the cellular behaviour at low growth temperatures and enables to define the response of the strain to sub-optimal temperature stress.