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This paper surveys the use of Spreading Activation techniques on Semantic Networks in Associative Information Retrieval. The major Spreading Activation models are presented and their applications to IR is surveyed. A number of works in this area are critically analyzed in order to study the relevance of Spreading Activation for associative IR.
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)
This paper presents a short survey of fuzzy and neural approaches to Information Retrieval. The goal of such approaches is to deene exible Information Retrieval Systems able to deal with the inherent v ague-ness and uncertainty of the retrieval process. In this survey we address if and how some approaches met their goal.
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)
In this paper we discuss the dynamics of probabilistic term weights in different IR retrieval models. We present four different models based on different notions of retrieval. Two of these models are classical probabilistic models long in use in IR, the two others are based on a logical technique of evaluating the probability of a conditional called… (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)
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)
i I certify that except where due acknowledgement has been given, the work presented in this thesis is that of the author alone; the work has not been submitted previously, in whole or in part, to qualify for any other academic award; and the content of the thesis is the result of work which has been carried out since the official commencement date of the… (More)
The research for this thesis was carried out at the Istituto Dalle Molle di Studi sull'Intelligenza Artificiale (IDSIA), under the supervision of Luca Maria Gambardella. Abstract Ad hoc wireless multi-hop networks (AHWMNs) are communication networks that consist entirely of wireless nodes, placed together in an ad hoc manner , i.e. with minimal prior… (More)
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