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     <dc:title xml:lang="fr">Modélisation de phénomènes hautement oscillants par réseaux de neurones</dc:title>
     <dcterms:alternative xml:lang="en">Modelling of highly oscillatory phenomenon by neural networks</dcterms:alternative>
     <dc:subject xml:lang="fr">Equations différentielles autonomes et fortement oscillantes</dc:subject><dc:subject xml:lang="fr">analyse rétrograde</dc:subject><dc:subject xml:lang="fr">méthodes numériques uniformément précises</dc:subject><dc:subject xml:lang="fr">réseaux de neurones</dc:subject><dc:subject xml:lang="fr">erreur numérique </dc:subject>
     <dc:subject xml:lang="en">Autonomous and highly oscillatory differential equations</dc:subject><dc:subject xml:lang="en">backward analysis</dc:subject><dc:subject xml:lang="en">uniformly accurate numerical methods</dc:subject><dc:subject xml:lang="en">neural networks</dc:subject><dc:subject xml:lang="en">numerical error </dc:subject><tef:sujetRameau><tef:vedetteRameauNomCommun>
						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="02722418X">Équations différentielles</tef:elementdEntree>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="030971098">Réseaux neuronaux (informatique)</tef:elementdEntree>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="027940373">Apprentissage automatique</tef:elementdEntree>
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     <dcterms:abstract xml:lang="fr">Cette thèse porte sur l’application du Machine Learning à l’étude d’équations différentielles fortement oscillantes. Plus précisément, on s’intéresse à une manière d’approcher de manière précise et avec le moins de calculs possible la solution d’une équation différentielle en s’aidant de réseaux de neurones. Tout d’abord, le cas autonome est étudié, où les propriétés de l’analyse rétrograde et des réseaux de neurones sont utilisés afin d’améliorer des méthodes numériques existantes, puis une généralisation au cas fortement oscillant est proposée afin d’améliorer un schéma numérique d’ordre un spécifique à ce cas de figure. Ensuite, les réseaux de neurones sont utilisés afin de remplacer les calculs préalables nécessaires à l’implémentation de méthodes numériques uniformément précises permettant d’approcher les solutions d’équations fortement oscillantes, que ce soit en partant des travaux mis en œuvre pour le cas autonome, ou bien en utilisant une structure de réseau de neurone intégrant directement la structure de l’équation. </dcterms:abstract>
     <dcterms:abstract xml:lang="en">This thesis focuses on the application of Machine Learning to the study of highly oscillatory differential equations. More precisely, we are interested in an approach to accurately approximate the solution of a differential equation with the least amount of computations, using neural networks. First, the autonomous case is studied, where the proper- ties of backward analysis and neural networks are used to enhance existing numerical methods. Then, a generalization to the strongly oscillating case is proposed to improve a specific first-order numerical scheme tailored to this scenario. Subsequently, neural networks are employed to replace the necessary pre- computations for implementing uniformly ac- curate numerical methods to approximate so- lutions of strongly oscillating equations. This can be done either by building upon the work done for the autonomous case or by using a neural network structure that directly incorporates the equation’s structure. </dcterms:abstract>
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