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...
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Thèse de doctorat : Université de Fribourg, 2009 ; Nr. 1640.
Gaussian linear information arises in many real-world models of the natural and social sciences. The Gaussian distribution has turned out to appropriately represent uncertainty in many linear models. The main goal of this thesis is to describe and to compare different algebras of Gaussian linear information: Corresponding elements and operations in the various algebras are revealed and the...
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Thèse de doctorat : Université de Fribourg, 2008 ; Nr. 1592.
After injury to the adult central nervous system (CNS), permanent deficits remain to a large part due to limited cell renewal, axonal regeneration and reestablishment of functional connectivity. Evidence indicate that the lack of axonal regeneration is partly due to the myelin-associated inhibitory factor Nogo-A. A therapeutical strategy to overcome this inhibition is to prevent the neurite...
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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...
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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...
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Thèse de doctorat : Université de Fribourg, 2002 ; no 1393.
This dissertation addresses three fundamental problems, which have to be handled in application domains like ubiquitous computing and Web services. The three problems heterogeneity, static configuration, and dynamic configuration are not only considered to persist during the near future but to increase, as similar application domains will emerge. The heterogeneity problem is defined and examples...
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Thèse de doctorat : Université de Fribourg, 2014.
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Thèse de doctorat : Université de Fribourg, 2012.
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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...
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Thèse de doctorat : Université de Fribourg, 2006 ; no 1520.
Currently, the Internet is not a privilege for specific groups any more. The wide coverage of the Internet brought lots of risks as well as convenience. Network security problems are the familiar loss of confidentiality, integrity and availability. One of the solution technologies is a defence system to protect network-connected resources, which is called a firewall. The more serious network...
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