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     <dc:title xml:lang="en">Belief detection and temporal analysis of experts in question answering communities : case strudy on stack overflow</dc:title>
     <dcterms:alternative xml:lang="fr">Détection et analyse temporelle des experts dans les réseaux communautaires de questions réponses : étude de cas Stack Overflow</dcterms:alternative>
     <dc:subject xml:lang="fr">Réseaux Communautaires de Questions Réponses</dc:subject>
<dc:subject xml:lang="fr">Expertise</dc:subject>
<dc:subject xml:lang="fr">Détection des Experts</dc:subject>
<dc:subject xml:lang="fr">Clustering</dc:subject>
<dc:subject xml:lang="fr">Théorie des fonctions de croyance</dc:subject>
<dc:subject xml:lang="fr">Combinaison</dc:subject>
     <dc:subject xml:lang="en">Question Answering Communities</dc:subject>
<dc:subject xml:lang="en">Expertise</dc:subject>
<dc:subject xml:lang="en">Experts detection</dc:subject>
<dc:subject xml:lang="en">Clustering</dc:subject>
<dc:subject xml:lang="en">Theory of Belief Functions</dc:subject>
<dc:subject xml:lang="en">Combination</dc:subject>
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						<tef:elementdEntree autoriteSource="Sudoc" autoriteExterne="12059319X">Web 2.0</tef:elementdEntree>
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     <dcterms:abstract xml:lang="fr">L'émergence du Web 2.0 a changé la façon avec laquelle les gens recherchent et obtiennent des informations sur internet. Entre sites communautaires spécialisés, réseaux sociaux, l'utilisateur doit faire face à une grande quantité d'informations. Les sites communautaires de questions réponses représentent un moyen facile et rapide pour obtenir des réponses à n'importe quelle question qu'une personne se pose. Tout ce qu'il suffit de faire c'est de déposer une question sur un de ces sites et d'attendre qu'un autre utilisateur lui réponde. Dans ces sites communautaires, nous voulons identifier les personnes très compétentes. Ce sont des utilisateurs importants qui partagent leurs connaissances avec les autres membres de leurs communauté. Ainsi la détection des experts est devenue une tache très importantes, car elle permet de garantir la qualité des réponses postées sur les différents sites. Dans cette thèse, nous proposons une mesure générale d'expertise fondée sur la théorie des fonctions de croyances. Cette théorie nous permet de gérer l'incertitude présente dans toutes les données émanant du monde réel. D'abord et afin d'identifier ces experts parmi la foule d'utilisateurs présents dans la communauté, nous nous sommes intéressés à identifier des attributs qui permettent de décrire le comportement de chaque individus. Nous avons ensuite développé un modèle statistique fondé sur la théorie des fonctions de croyance pour estimer l'expertise générale des usagers de la plateforme. Cette mesure nous a permis de classifier les différents utilisateurs et de détecter les plus experts d'entre eux. Par la suite, nous proposons une analyse temporelle pour étudier l'évolution temporelle des utilisateurs pendant plusieurs mois. Pour cette partie, nous décrirons com- ment les différents usagers peuvent évoluer au cours de leur activité dans la plateforme. En outre, nous nous sommes également intéressés à la détection des experts potentiels pendant les premiers mois de leurs inscriptions dans un site. L'efficacité de ces approches a été validée par des données réelles provenant de Stack Overflow.</dcterms:abstract>
     <dcterms:abstract xml:lang="en">During the last decade, people have changed the way they seek information online. Between question answering communities, specialized websites, social networks, the Web has become one of the most widespread platforms for information exchange and retrieval. Question answering communities provide an easy and quick way to search for information needed in any topic. The user has to only ask a question and wait for the other members of the community to respond. Any person posting a question intends to have accurate and helpful answers. Within these platforms, we want to find experts. They are key users that share their knowledge with the other members of the community. Expert detection in question answering communities has become important for several reasons such as providing high quality content, getting valuable answers, etc. In this thesis, we are interested in proposing a general measure of expertise based on the theory of belief functions. Also called the mathematical theory of evidence, it is one of the most well known approaches for reasoning under uncertainty. In order to identify experts among other users in the community, we have focused on finding the most important features that describe every individual. Next, we have developed a model founded on the theory of belief functions to estimate the general expertise of the contributors. This measure will allow us to classify users and detect the most knowledgeable persons. Therefore, once this metric defined, we look at the temporal evolution of users' behavior over time. We propose an analysis of users activity for several months in community. For this temporal investigation, we will describe how do users evolve during their time spent within the platform. Besides, we are also interested on detecting potential experts during the beginning of their activity. The effectiveness of these approaches is evaluated on real data provided from Stack Overflow.</dcterms:abstract>
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