A lattice-based model for information retrieval has been suggested in the 1960’s but has been seen as a theoretical possibility hard to practically apply ever since. This paper attempts to revive the lattice model and demonstrate its applicability in an information retrieval system, FaIR, that incorporates a graphical representation of a faceted thesaurus. It shows how Boolean queries can be la...

We describes our experiments in the routing, ltering and Chinese text retrieval. We based our routing and ltering experiments on our discriminant project algorithm. The algorithm sequentially constructs a series of orthogonal axis from the training documents using the Gram-Schmidt procedure. It then rotates the resulting subspace using principal component analysis so that the axis are ordered b...

An evaluation of an information retrieval system using a Boolean-based retrieval engine and inverted file architecture and WAIS, which uses a vector-based engine, was conducted. Four research questions in aeronautical engineering were used to retrieve sets of citations from the NASA Aerospace Database which was mounted on a WAIS server and available through Dialog File 108 which served as the B...

Applying information retrieval techniques to the World Wide Web (WWW) environment is a unique challenge, mostly because of its hypertext/hypermedia nature and the richness of the meta-information it provides. We present four keyword-based search and ranking algorithms for locating relevant WWW pages with respect to user queries. The rst algorithm, Boolean Spread Activation, extends the notion o...

This paper describes a flexible information retrieval approach based on CP-Nets (Conditional Preferences Networks). The CP-Net formalism is used for both representing qualitative queries (expressing user preferences) and representing documents in order to carry out the retrieval process. Our contribution focuses on the difficult task of term weighting in the case of qualitative queries. In this...

We describe the design and implementation of a legal text database. The database of provides a number of Greek Council of State decisions in the form of a computer-accessible medium (CD-ROM). A graphical front-end is provided which allows the rapid retrieval of cases based on arbitrary keywords combined using boolean operators. The database was populated by automatically converting the word-pro...

Searching and selecting articles to be included in systematic reviews is a real challenge for healthcare agencies responsible for publishing these reviews. The current practice of manually reviewing all papers returned by complex hand-crafted boolean queries is human labour-intensive and difficult to maintain. We demonstrate a two-stage searching system that takes advantage of ranked queries an...

The ubiquitous usage of databases for managing structured data, compounded with the expanded reach of the Internet to end users, has brought forward new scenarios of data retrieval. Users often want to express non-traditional fuzzy queries with soft criteria, in contrast to Boolean queries, and to explore what choices are available in databases and how they match the query criteria. Conventiona...

We present the main features of an Information Retrieval and Extraction system based on natural language asymmetric relations. We show that, along with the identification of functional elements, asymmetric relations contribute to improve the performance of search engines. We compare an Information Retrieval and Extraction system based on the recovery of a subset of asymmetric relations with cur...

The use of MPI in implementing algorithms for Parallel Information Retrieval Systems is outlined. We include descriptions on methods for Indexing, Search and Update of Inverted Indexes as well as a method for Information Filtering. In Indexing we describe both local build and distributed build methods. Our description of Document Search includes that for Term Weighting, Boolean, Proximity and P...