Université de Neuchâtel

Multimodal information retrieval

Geiger, Melanie ; Savoy, Jacques (Dir.) ; Braschler, Martin (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2018.

Knowledge-intensive business processes, one of the essential drivers of our economy today, often rely on multimodal information retrieval systems that have to deal with increasingly complex document collections and queries. The complexity mainly evolves due to a large and diverse range of textual and non-textual modalities such as geographical coordinates, ratings and timestamps used in the...

Université de Neuchâtel

Text clustering with styles

Kocher, MIrco ; Savoy, Jacques (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

This thesis mainly describes the author clustering problem where, based on a set of n texts, the goal is to determine the number k of distinct authors and regroup the texts into k classes according to their author. We iteratively build a stable and simple model for text clustering with styles. We start by designing a measure reflecting the (un)certainty of the proposed...

Université de Neuchâtel

Multilingual and domain-specific IR : a case study in cultural heritage

Akasereh, Mitra ; Savoy, Jacques (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2015.

Nowadays we can find data collections in many different languages and in different fields. So we are facing with a rising need for search systems handling multilinguality as well as professional search systems which allow their users to search in a specific field of knowledge. In this thesis we propose a search system for data on cultural heritage. Our data comes from different resources...

Université de Neuchâtel

Information retrieval of digitized medieval manuscripts

Naji, Nada ; Savoy, Jacques (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2013.

This dissertation investigates the retrieval of noisy texts in general and digitized historical manuscripts in particular. The noise originates from several sources, these include imperfect text recognition (6% word error rate), spelling variation, non-standardized grammar, in addition to user-side confusion due to her/his limited knowledge of the underlying language and/or the searched text....

Université de Neuchâtel

Feature weighting approaches in sentiment analysis of short text

Kummer, Olena ; Savoy, Jacques (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2012.

In this thesis, we propose a supervised classification scheme based on computation of the statistical scores for the textual features. More specifically, we consider binary classification (opinionated or factual, positive or negative) of the short text in the domains of movie reviews and newspaper articles. We analyze the performance of the proposed models on the corpora with the unequal sizes of...

Université de Neuchâtel

Influence of language morphological complexity on information retrieval

Dolamic, Ljiljana ; Savoy, Jacques (Dir.) ; Kropf, Peter (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2010.

In this dissertation two aspects of information retrieval are elaborated. The frst involves the creation and evaluation of various linguistic tools for languages less studied than English, and in our case we have chosen to work with the two Slavic languages Czech and Russian, and three languages widely spoken on the Indian subcontinent, Hindi, Marathi and Bengali. To do so we compare various...

Université de Neuchâtel

Domain specific information retrieval social science, blogsphere and biomedicine

Fautsch, Claire ; Savoy, Jacques (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2009 ; Th. 2122.

Nowadays information retrieval is widely known and used in the context of online web search engines. Information retrieval however also presents many other fields of applications, one of which is domain-specific information retrieval. This thesis summarizes our work in this field by presenting a selection of our research papers. In the presented work the challenges of information retrieval in...

Université de Neuchâtel

Recherche d'information plurilingue

Abdou, Samir ; Savoy, Jacques (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2007 ; Th.1972.

Dans cette thèse, nous présentons nos investigations en recherche d’information selon deux contextes. Premièrement, nous nous sommes intéressés à l’aspect plurilingue de la Toile en abordant le développement de moteurs de recherche pour des langues présentant des caractéristiques visuelles, morphologiques et syntaxiques très différentes des langues indo-européennes. Plus...

Université de Neuchâtel

Extraction automatique d'information : génération de résumé et question-réponse

Perret, Laura ; Savoy, Jacques (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2005 ; 1792.

In this dissertation, we tackle two aspects of the information retrieval field, nemely text summarization and question answering. The first part is devoted to the implementation and the evaluation of several methods for summarization of medical articles. The logistic regression was found to produce the best results. We also combine this method with a classification approach provided by another...

Université de Neuchâtel

Recherche d'information bilingue et multilingue : amélioration de la traduction automatique et sélection de traducteur

Berger, Pierre-Yves ; Savoy, Jacques (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2006 ; 1868.

Dans cette thèse, nous abordons différentes techniques visant à améliorer l'utilisation de la traduction automatique dans le contexte de la recherche d'information bilingue et multilingue. Nous avons quantifié la perte de performance liée à la traduction automatique de la requête d'une langue vers une autre. Pour diminuer cette perte d'efficacité, nous avons évalué six approches, à...