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The rst part of the paper brieey introduces what automatic au-thoring of a hypertext for information retrieval means. The most diicult part of the automatic construction of a hypertext is the creation of links connecting documents or document fragments that are semantically related. Because of this, to many researchers it seemed natural to use IR techniques(More)
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The evaluation of an implication by Imaging is a logical technique developed in the framework of modal logic. Its interpretation in the context of a possible worlds" semantics is very appealing for IR. In 1989, Van Rijsbergen suggested its use for solving one of the fundamental problems of logical models in IR: the evaluation of the implication d ! q where(More)
Bibliography 167 Index 179 Mystics exult in mystery and want it to stay mysterious. Scientists exult in mystery for a different reason: it gives them something to do. Preface This thesis concerns the optimal behaviour of agents in unknown computable environments, also known as universal artificial intelligence. These theoretical agents are able to learn to(More)
This contribution presents the evaluation methodology for the identification of potential " sexual predators " in online conversations as part of PAN 2012. We provide details of the realized collection and analyse the submissions of the participants, who had to solve two problems: identify the predators among all the users in the different conversations and(More)
In this paper we present some new methods of ranking information retrieval systems without relevance judgement. The common ground of these methods is using a measure we called reference count. An extensive experimentation was conducted to evaluate the effectiveness of the proposed methods using various different standards Information Retrieval evaluation(More)
The increasing popularity of online-based services (Twitter, Facebook, IRC, Myspace, blogs, just to mention few of them) results in a production of a huge amount of novel documents. These documents present properties that can not be found in standard edited documents. In particular the messages generated during the use of Instant Messages Services (IM) like(More)