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CoModels, engineering dynamic compositions of coupled models to support the simulation of complex systems / CoModels : ingénierie des compositions dynamiques de modèles couplés pour supporter la simulation de systèmes complexesHuynh, Quang-Nghi 05 December 2016 (has links)
L'objectif initial de cette thèse est d'apporter une solution à ce problème en proposant, premièrement, une approche cognitive basée sur le paradigme appelé Belief-Desire-Intention (BDI) pour représenter les processus de prise de décision des acteurs humains, et deuxièmement, une validation de cette approche dans le contexte d'un modèle complet de changement d'usage des sols dans lequel la plupart des facteurs cités ci-dessus sont également simulés. Le résultat de ce travail est une approche générique qui a été validée sur un modèle intégrant le changement d'usage des sols d'une région située dans le Delta du Mékong au Vietnam. Nos contributions principales sont les suivantes : Intégration d'une architecture BDI au sein d'une plateforme de modélisation à base d'agents (GAMA) ; Conception d'un cadre générique baptisé " Multi-Agent Based Land-Use Change " (MAB-LUC) permettant de modéliser et de simuler les changements d'usage des sols en prenant en compte les décisions des agriculteurs ; Proposition d'une solution permettant d'intégrer et d'évaluer les facteurs socio-économiques et environnementaux dans le cadre de la planification agraire et d'intégrer MAB-LUC dans le processus existant proposé par la FAO. Ce travail, au-delà du cas d'étude concernant le Delta du Mékong, a enfin été conçu de façon générique afin que la méthodologie utilisée puisse être généralisée à la modélisation de systèmes socio-écologiques où les facteurs humains doivent être représentés avec précision. / Integrated modeling approaches (multi-simulation, multimodeling, etc.) have proven challenging in practice. The first challenge deals with the technical aspects of coupling different computational or mathematical components. The second challenge lies in the alignment of the semantics of these components so that their integration does make sense, which is particularly critical in pluridisciplinary models. A number of approaches have been proposed in the last 20 years but none of them is really suitable to our context . We propose in this thesis an alternate approach, called co-modeling, which borrows concepts and tools from agent-based modeling, agent-oriented software engineering and multimodel ecologies. Simply speaking, a co-model can be defined as a multi-agent system of models and datasets. Each model or dataset is represented by one or several agents interacting with one another within the context of a larger representation of their — potentially dynamic — environment. The proposed approach does not aim at providing a general solution to the two challenges above, but at providing a framework in which modelers can easily implement their solution or test different coupling solutions. The proposed approach is fully implemented within the GAMA agent-based modeling platform. Its advantages are shown in terms of flexibility, composability and reusability in a number of case studies. The first case study is the dynamic coupling of equation-based and agent-based models to obtain “switching” models dynamically. The second one is the design of a complex integrated model where three formalisms and four modeling approaches have been successfully coupled.
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A critical appraisal of intrinsic activity, efficacy and intrinsic efficacy with reference to the development and the current meaning / Karen KrügerKruger, Karen January 2006 (has links)
It has been observed that confusion exists in literature concerning the meaning and use of the
term efficacy. Confusion is worsened by the use of the term as a general term describing agonist
activity. The meaning of the terms intrinsic activity, efficacy and intrinsic efficacy as used in
theoretical models of drug action was investigated. The classical occupation model, the two-state
model, the ternary complex model (including conformational change and ideas surrounding G-proteins)
and the operational model were studied in order to understand the historical and current
usage of these terms. Although efficacy estimates are often reported as a molecular property, it
was shown that agonist activity is tissue dependent and cannot be fully portrayed by an efficacy
estimate. It was found that efficacy has a different definition in each model. This is not always
recognized in literature. It was suggested that the term efficacy should only be used in the
context of a specific model / Thesis (M.Sc. (Pharmacology))--North-West University, Potchefstroom Campus, 2007.
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A critical appraisal of intrinsic activity, efficacy and intrinsic efficacy with reference to the development and the current meaning / Karen KrügerKruger, Karen January 2006 (has links)
It has been observed that confusion exists in literature concerning the meaning and use of the
term efficacy. Confusion is worsened by the use of the term as a general term describing agonist
activity. The meaning of the terms intrinsic activity, efficacy and intrinsic efficacy as used in
theoretical models of drug action was investigated. The classical occupation model, the two-state
model, the ternary complex model (including conformational change and ideas surrounding G-proteins)
and the operational model were studied in order to understand the historical and current
usage of these terms. Although efficacy estimates are often reported as a molecular property, it
was shown that agonist activity is tissue dependent and cannot be fully portrayed by an efficacy
estimate. It was found that efficacy has a different definition in each model. This is not always
recognized in literature. It was suggested that the term efficacy should only be used in the
context of a specific model / Thesis (M.Sc. (Pharmacology))--North-West University, Potchefstroom Campus, 2007.
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Anatolij Fjodorovič Širjajev a jeho přínos pro teorii tlumočení / Anatoly Fedorovich Shiryaev and his Contribution to Interpreting StudiesKoválik, Jan January 2019 (has links)
This thesis describes the lifelong work of significant Russian interpretation theorist, pedagogue and active conference interpreter Anatoly Fedorovich Shiryaev. The thesis is theoretical and is divided into three main sections. In the first section, the theoretical background that helps A. F. Shiryaev develop his Complex Model of Simultaneous Interpretation is described. It focuses on the unit of orientation, redundancy and speech compression in detail. This section explains why these are important in the simultaneous interpretation context and the role they have in its process. In the second section, A. F. Shiryaev's Complex Model of Simultaneous Interpretation is analysed in detail along with its specific features. Next, the model is compared with other selected simultaneous interpretation models which were being developed approximately at the same time. The third section describes A. F. Shiryaev's approach to simultaneous interpretation teaching. It deals with methodology and teaching didactics, and the objectives which are to be achieved during the simultaneous interpretation course, and describes the system of interpretation exercises. The thesis also includes a brief biography of A. F. Shiryaev which presents information about his professional life.
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Initialize and Calibrate a Dynamic Stochastic Microsimulation Model: Application to the SimVillages ModelLenormand, Maxime 12 December 2012 (has links) (PDF)
Le but de cette thèse est de développer des outils statistiques permettant d'initialiser et de calibrer les modèles de microsimulation dynamique stochastique, en partant de l'exemple du modèle SimVillages (développé dans le cadre du projet Européen PRIMA). Ce modèle couple des dynamiques démographiques et économiques appliquées à une population de municipalités rurales. Chaque individu de la population, représenté explicitement dans un ménage au sein d'une commune, travaille éventuellement dans une autre, et possède sa propre trajectoire de vie. Ainsi, le modèle inclut-il des dynamiques de choix de vie, d'étude, de carrière, d'union, de naissance, de divorce, de migration et de décès. Nous avons développé, implémenté et testé les modèles et méthodes suivants: * un modèle permettant de générer une population synthétique à partir de données agrégées, où chaque individu est membre d'un ménage, vit dans une commune et possède un statut au regard de l'emploi. Cette population synthétique est l'état initial du modèle. * un modèle permettant de simuler une table d'origine-destination des déplacements domicile-travail à partir de données agrégées. * un modèle permettant d'estimer le nombre d'emplois dans les services de proximité dans une commune donnée en fonction de son nombre d'habitants et de son voisinage en termes de service. * une méthode de calibration des paramètres inconnus du modèle SimVillages de manière à satisfaire un ensemble de critères d'erreurs définis sur des sources de données hétérogènes. Cette méthode est fondée sur un nouvel algorithme d'échantillonnage séquentiel de type Approximate Bayesian Computation.
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CHYBOVOST A DOSTUPNOST ATMOSFÉRICKÝCH OPTICKÝCH SPOJŮ / BIT ERROR RATE AND AVAILABILITY OF THE ATMOSPHERIC OPTICAL LINKSKvíčala, Radek January 2009 (has links)
This dissertation deals with the problematic of the free space optical link availability determination. For the presumption of the free space optical link unavailability we have to know statistical distribution of the atmospheric attenuations. In this work is also presented the measurement of these atmospheric attenuations with the specially designed optical link. Measurement is using switching of the two separate transmitters with wavelengths of 830 nm and 1550 nm. Presented statistic distribution let us determine the suitability of the link in the chosen locality during its design. Comparison of our measurement with other models like model based on the meteorological visibility is also presented. The last part of this work is focused on the preconditions for the hi-speed network bit error rate determination. Sample of the bit error rate measurement obtained by our designed bit error rate tester is attached.
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Initialiser et calibrer un modèle de microsimulation dynamique stochastique : application au modèle SimVillages / Initialize and Calibrate a Dynamic Stochastic Microsimulation Model : application to the SimVillages ModelLenormand, Maxime 12 December 2012 (has links)
Le but de cette thèse est de développer des outils statistiques permettant d'initialiser et de calibrer les modèles de microsimulation dynamique stochastique, en partant de l’exemple du modèle SimVillages (développé dans le cadre du projet Européen PRIMA). Ce modèle couple des dynamiques démographiques et économiques appliquées à une population de municipalités rurales. Chaque individu de la population, représenté explicitement dans un ménage au sein d’une commune, travaille éventuellement dans une autre, et possède sa propre trajectoire de vie. Ainsi, le modèle inclut-il des dynamiques de choix de vie, d’étude, de carrière, d’union, de naissance, de divorce, de migration et de décès. Nous avons développé, implémenté et testé les modèles et méthodes suivants : 1 / un modèle permettant de générer une population synthétique à partir de données agrégées, où chaque individu est membre d’un ménage, vit dans une commune et possède un statut au regard de l’emploi. Cette population synthétique est l’état initial du modèle. 2 / un modèle permettant de simuler une table d’origine-destination des déplacements domicile-travail à partir de données agrégées. 3 / un modèle permettant d’estimer le nombre d’emplois dans les services de proximité dans une commune donnée en fonction de son nombre d’habitants et de son voisinage en termes de service. 4 / une méthode de calibration des paramètres inconnus du modèle SimVillages de manière à satisfaire un ensemble de critères d'erreurs définis sur des sources de données hétérogènes. Cette méthode est fondée sur un nouvel algorithme d’échantillonnage séquentiel de type Approximate Bayesian Computation. / The purpose of this thesis is to develop statistical tools to initialize and to calibrate dynamic stochastic microsimulation models, starting from their application to the SimVillages model (developed within the European PRIMA project). This model includes demographic and economic dynamics applied to the population of a set of rural municipalities. Each individual, represented explicitly in a household living in a municipality, possibly working in another, has its own life trajectory. Thus, model includes rules for the choice of study, career, marriage, birth children, divorce, migration, and death. We developed, implemented and tested the following models : • a model to generate a synthetic population from aggregate data, where each individual lives in a household in a municipality and has a status with regard to employment. The synthetic population is the initial state of the model. • a model to simulate a table of origin-destination commuting from aggregate data in order to assign a place of work for each individual working outside his municipality of residence. • a sub-model to estimate the number of jobs in local services in a given municipality in terms of its number of inhabitants and its neighbors in terms of service. • a method to calibrate the unknown SimVillages model parameters in order to satisfy a set of criteria. This method is based on a new Approximate Bayesian Computation algorithm using importance sampling. When applied to a toy example and to the SimVillages model, our algorithm is 2 to 8 times faster than the three main sequential ABC algorithms currently available.
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