ACM Transactions on Information Systems articles

Recent articles from ACM Transactions on Information Systems

Query-Based Sampling of Text Databases.
April 1, 2001... 1. INTRODUCTION When many document databases are accessible, the first step of Information Retrieval is deciding where to search. Manual selection can be difficult when there are many databases from which to choose, so researchers have developed automatic content-based database selection...

SALSA: The Stochastic Approach for Link-Structure Analysis.
April 1, 2001... 1. INTRODUCTION 1.1 Searching the WWW--The Challenge The WWW is a rapidly expanding hyperlinked collection of unstructured information. The lack of structure and the enormous volume of the WWW pose tremendous challenges on the WWW Information Retrieval systems called search engines....

Complete Answer Aggregates for Tree-Like Databases: A Novel Approach to Combine Querying and Navigation.
April 1, 2001... 1. INTRODUCTION Databases where entries are described as trees are interesting for many reasons. Most importantly, the use of markup languages like HTML [W3C 1998b] or XML [W3C 1998a] for documents in the World Wide Web, as well as the use of other SGML [ISO 1986; Goldfarb 1990] dialects...

An Information-Theoretic Approach to Automatic Query Expansion.
January 1, 2001... 1. INTRODUCTION Current information retrieval systems are limited by many factors reflecting the difficulty to satisfy user requirements expressed by short queries for identifying documents which often are long and have complex structures. Moreover, the user may express the conceptual...

A Statechart-Based Model for Hypermedia Applications.
January 1, 2001... 1. INTRODUCTION A major challenge facing the author of hyperdocuments and hypermedia applications in general is that of suitably organizing complex material. Systematic approaches for defining the structural organization are especially important in the design of large and complex...