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Agosti, M.; Pretto, L.: ¬A theoretical study of a generalized version of kleinberg's HITS algorithm (2005) 0.04

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Abstract: Kleinberg's HITS (Hyperlink-Induced Topic Search) algorithm (Kleinberg 1999), which was originally developed in a Web context, tries to infer the authoritativeness of a Web page in relation to a specific query using the structure of a subgraph of the Web graph, which is obtained considering this specific query. Recent applications of this algorithm in contexts far removed from that of Web searching (Bacchin, Ferro and Melucci 2002, Ng et al. 2001) inspired us to study the algorithm in the abstract, independently of its particular applications, trying to mathematically illuminate its behaviour. In the present paper we detail this theoretical analysis. The original work starts from the definition of a revised and more general version of the algorithm, which includes the classic one as a particular case. We perform an analysis of the structure of two particular matrices, essential to studying the behaviour of the algorithm, and we prove the convergence of the algorithm in the most general case, finding the analytic expression of the vectors to which it converges. Then we study the symmetry of the algorithm and prove the equivalence between the existence of symmetry and the independence from the order of execution of some basic operations on initial vectors. Finally, we expound some interesting consequences of our theoretical results.
Date: 31.12.1996 19:29:41
Source: Advances in mathematical/formal methods in information retrieval. 8(2005) no.2 , S.219-243

Agosti, M.: Hypertext and information retrieval (1993) 0.03

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Source: Information processing and management. 29(1993) no.3, S.283-286

Agosti, M.; Colotti, R.; Gradenigo, G.: Issues of data modelling in information retrieval (1991) 0.03

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Abstract: Addresses the problem of data modelling in information retrieval introducing various aspects and issues that are necessarily taken into account when designing and developing an information retrieval system. Pays particular attention to the representation of different types of data managed by an information retrieval application: structured and unstructured data. A recently introduced information retrieval, data modelling approach supports the notion of a schema permitting representation of the information retrieval data on 2 different levels: intensional and extensional. presents the characteristics of this data modelling approach here together with examples of its use in a working prototype

Agosti, M.; Melucci, M.: Information retrieval techniques for the automatic construction of hypertext (2000) 0.03

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Source: Encyclopedia of library and information science. Vol.66, [=Suppl.29]

Agosti, M.; Smeaton, A.F.: Information retrieval and hypertext (1996) 0.02

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COMPASS: Information retrieval
LCSH: Information retrieval
Subject: Information retrieval
Information retrieval

Agosti, M.; Crestani, F.; Melucci, M.: On the use of information retrieval techniques for the automatic construction of hypertext (1997) 0.01
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Abstract

Introduces what automatic authoring of a hypertext for information retrieval means. The most difficult part of the automatic construction of a hypertext is the creation of links connecting documents or document fragments that are related. Becaus of this, to many researchers it seemed natural to use information retrieval techniques for this purpose, since information retrieval has always dealt with the construction of relationships between objects mutually relevant. Presents a survey of some of the attempts toward the automatic construction of hypertexts for information retrieval. Identifies and compares scope, advantages and limitations of different approaches. Points out the main and most successful current lines of research
Agosti, M.; Crestani, F.; Melucci, M.: Design and implementation of a tool for the automatic construction of hypertexts for information retrieval (1996) 0.01
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Abstract

Describes the design and implementation of TACHIR, a tool for the automatic construction of hypertexts for information retrieval. Through the use of an authoring methodology employing a set of well known information retrieval techniques, TACHIR automatically builds up a hypertext from a document collection. The structure of the hypertext reflects a 3 level conceptual model which enables navigation among documents, index terms, and concepts using automatically determined links. The hypertext is implemented using the HTML language. It can be distributed on different sites and different machines over the Internet, and it can be navigated using WWW interfaces

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