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In this article the formal basis of hyperindices is given. Hyperindices are a new means for supporting eeective search in hypermedia. The basis of the hyperindex, the so called index expression is treated in detail. It is shown how the hyperindex can be constructed using the structural properties of the index expression. The hyperindex is placed in a(More)
This article compares search effectiveness when using query-based Internet search (via the Google search engine), directory-based search (via Yahoo) and phrase-based query reformulation assisted search (via the Hyperindex browser) by means of a controlled, user-based experimental study. The focus was to evaluate aspects of the search process. Cognitive load(More)
Often queries to internet search engines consist of one or two terms. As a consequence, the eeectiveness of the retrieval suuers. This paper describes an internet search engine that helps the user formulate their query by a process of navigation through a structured, automatically constructed, information space called a hyperindex. In the rst part of this(More)
Language Modeling (LM) has been successfully applied to Information Retrieval (IR). However, most of the existing LM approaches only rely on term occurrences in documents, queries and document collections. In traditional unigram based models, terms (or words) are usually considered to be independent. In some recent studies, dependence models have been(More)
In this paper we generalize the two level approach approach to hyper-text (hypermedia) systems into stratiied hypermedia structures. First we describe the overall architecture of such systems, including the fundamentals of the user interface. Thereafter, its various components are discussed. Special emphasis is paid to how the underlying information model(More)
Applying Belief Revision logic to model adaptive information retrieval is appealing since it provides a rigorous theoretical foundation to model <i>partiality</i> and <i>uncertainty</i> inherent in any information retrieval (IR) processes. In particular, a retrieval context can be formalised as a belief set and the formalised context is used to disambiguate(More)