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Université de Fribourg

Study of 110Cd using the (n, n'γ) reaction and 114Te using the (α, 2n) reaction

Corminboeuf, Frédéric ; Jolie, Jan (Dir.)

Thèse de doctorat : Université de Fribourg : 2000 ; Nr. 1326.

The study of nuclear structure is one of the research domains in nuclear physics which have known an important development. It has asked a great effort for the experimenters as well as the theoreticians to study in detail the nuclear many-body problem. In the framework of this thesis, we have tested several nuclear models for two nuclei: 110Cd and 114Te. This choice has not been made at random....

Université de Fribourg

2(CREM) : une méthode de reconnaissance structurelle de documents complexes basée sur des patterns bidimensionnels

Robadey, Lyse ; Ingold, Rolf (Dir.) ; Bapst, Frédéric (Codir.)

Thèse de doctorat : Université de Fribourg : 2001 ; No 1364.

This thesis addresses the question of printed document recognition. We studied existing systems, first in a general context, by making the distinction between physical and logical structure recognition systems. Then, we focused on methods specific for complex layout documents and on methods having a learning aptitude. Since there do not seem to exist learning systems which are able to recognise...

Université de Fribourg

Experimental Evolutionary Biology of Learning in “drosophila melanogaster”

Mery, Frederic ; Kawecki, Tadeusz (Dir.)

Thèse de doctorat : Université de Fribourg : 2003 ; 1403.

Many animals, including small invertebrates, have the capacity to modify their behaviour based on experience - they can learn. The ability to learn is itself a product of evolution, and the degree to which a given behaviour is modified by learning varies among species and among different types of behaviour. For an evolutionary biologist this raises the question of the conditions under which...

Université de Fribourg

Une approche uniforme pour la reconnaissance de la structure physique de documents composites fondée sur l'analyse des espaces

Azokly, Antoine Sourou ; Ingold, Rolf (Dir.) ; Stamon, Georges (Codir.)

Thèse de doctorat : Université de Fribourg : 1995 ; 1105.

We present in this thesis a uniform approach to recognize the physical structure of printed documents that may contain various kinds of blocks: we call such documents composite documents. After an introduction to the subject of this thesis, we present first the state of the art in the field of document recognition. In this part, we present models and standards used to represent document...

Université de Fribourg

Argumentation systems and belief functions

Lehmann, Norbert ; Kohlas, Jürg (Dir.) ; Moral, Serafin (Codir.)

Thèse de doctorat : Université de Fribourg : 2001 ; 1340.

Uncertain knowledge can be represented in the framework of argumentation systems. In this framework, uncertainty is expressed using so-called assumptions. Depending on the setting of the assumptions, a given hypothesis of interest can be proved or falsified. The main goal of assumption-based reasoning is to determine the set of all supporting arguments for a given hypothesis. Such a supporting...

Université de Fribourg

Weak-coupling instabilities of two-dimensional lattice electrons

Binz, Benedikt ; Baeriswyl, Dionys (Dir.) ; Douçot, Benoit (Codir.)

Thèse de doctorat : Université de Fribourg : 2002 ; 1374.

Interacting e1ectrons in two dimensions are of particular interest in relation to high-temperature superconductivity. In this thesis, I study a two-dimensional extended Hubbard model in the weak coupling limit. Quite generally, the electron gas is unstable towards a superconducting state even in the absence of phonons. However in the special case of a half-filled band, the Fermi surface is nested...

Université de Fribourg

Content-based image retrieval using hand-drawn sketches and local features : a study on visual dissimilarity

Banfi, Folco ; Ingold, Rolf (Dir.)

Thèse de doctorat : Université de Fribourg : 2000 ; no 1312.

This thesis addresses the question of content-based image retrieval (CBIR) in heterogeneous databases. In an analysis of the existing CBIR tools that was done at the beginning of this work, we have shown that there was room for improvement in three key areas: query form, image and query representation, and computation of similarity. This analysis led us to studying the usability of a method for...

Université de Fribourg

Le phénomène de la douleur chez l'enfant

Spicher, Pascale ; Retschitzki, Jean (Dir.) ; Reicherts, Michael (Codir.)

Thèse de doctorat : Université de Fribourg : 2002.

Jusqu'à la fin des années quatre-vingt, les scientifiques affirment que les bébés ne peuvent pas ressentir la douleur puisque leurs fibres de la nociception sont immatures jusqu'à une année environ. Dès 1987, les publications de Kanwaljeet Anand ont été les plaques révélatrices de photographies peu réjouissantes : dès la 20ème semaine intra-utérine, le foetus a tout ce qu'il faut...