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ACM Transactions on Information Systems (TOIS), Volume 20 Issue 3, July 2002

Improving retrieval feedback with multiple term-ranking function combination
Claudio Carpineto, Giovanni Romano, Vittorio Giannini
Pages: 259-290
DOI: 10.1145/568727.568728
In this article we consider methods for automatic query expansion from top retrieved documents (i.e., retrieval feedback) that make use of various functions for scoring expansion terms within Rocchio's classical reweighting scheme. An analytical...

An intelligent approach to handling imperfect information in concept-based natural language queries
Vesper Owei
Pages: 291-328
DOI: 10.1145/568727.568729
Missing information, imprecision, inconsistency, vagueness, uncertainty, and ignorance abound in information systems. Such imperfection is a fact of life in database systems. Although these problems are widely studied in relational database systems,...

A general-purpose compression scheme for large collections
Adam Cannane, Hugh E. Williams
Pages: 329-355
DOI: 10.1145/568727.568730
Compression of large collections can lead to improvements in retrieval times by offsetting the CPU decompression costs with the cost of seeking and retrieving data from disk. We propose a semistatic phrase-based approach called xray that builds a...