Results 1 - 10 of 3,131

Querying object-oriented databases

by Michael Kifer, Won Kim, Yehoshua Sagiv - ACM SIGMOD INTERNATIONAL CONFERENCE ON MANAGEMENT OF DATA , 1992
"... We present a novel language for querying object-oriented databases. The language is built around the idea of extended path expressions that substantially generalize [ZAN83], and on an adaptation of the first-order formalization of object-oriented languages from [KW89, KLW90, KW92]. The language inco ..."
Abstract - Cited by 492 (6 self) - Add to MetaCart
the system tables that store schema information. ffl The notions of a type and type-correctness have precise meaning. It accommodates a wide variety of queries that might be deemed well- or ill-typed under different circumstances. In particular, we show that there is more than one way of settling the issue

Query expansion using lexical-semantic relations

by Ellen M. Voorhees - In Proceedings of the 17th Annual International ACM SIGIR Conference on Research and Development in Information Retrieval , 1994
"... Applications such as office automation, news filtering, help facilities in complex systems, and the like require the ability to retrieve documents from full-text databases where vocabulary problems can be particularly severe. Experiments performed on small collections with single-domain thesauri sug ..."
Abstract - Cited by 395 (1 self) - Add to MetaCart
Net synonym sets and are expanded by following the typed links included in Word Net. Experimental results show this query expansion technique makes little difference in retrieval effectiveness if the original queries are relatively complete descriptions of the information being sought even when the concepts

Efficient Query Evaluation on Probabilistic Databases

by Nilesh Dalvi, Dan Suciu , 2004
"... We describe a system that supports arbitrarily complex SQL queries with ”uncertain” predicates. The query semantics is based on a probabilistic model and the results are ranked, much like in Information Retrieval. Our main focus is efficient query evaluation, a problem that has not received attentio ..."
Abstract - Cited by 456 (47 self) - Add to MetaCart
We describe a system that supports arbitrarily complex SQL queries with ”uncertain” predicates. The query semantics is based on a probabilistic model and the results are ranked, much like in Information Retrieval. Our main focus is efficient query evaluation, a problem that has not received

Improving automatic query expansion

by Ar Mitra Amit Singhal , 1998
"... Abstract Most casual users of IR systems type short queries. Recent research has shown that adding new words to these queries via odhoc feedback improves the re-trieval effectiveness of such queries. We investigate ways to improve this query expansion process by refining the set of documents used in ..."
Abstract - Cited by 286 (4 self) - Add to MetaCart
Abstract Most casual users of IR systems type short queries. Recent research has shown that adding new words to these queries via odhoc feedback improves the re-trieval effectiveness of such queries. We investigate ways to improve this query expansion process by refining the set of documents used

Retrieving And Integrating Datafrom Multiple Information Sources

by Yigal Arens , Chin Y. Chee, Chun-Nan Hsu, Craig A. Knoblock , 1993
"... With the current explosion of data, retrieving and integrating information from various sources is a critical problem. Work in multidatabase systems has begun to address this problem, but it has primarily focused on methods for communicating between databases and requires significant effort for e ..."
Abstract - Cited by 332 (31 self) - Add to MetaCart
sources (e.g., programs) could potentially be incorporated into the system. This paper describes how both the domain and the information sources are modeled, shows how a query at the domain level is mapped into a set of queries to individual information sources, and presents algorithms

Information Retrieval as Statistical Translation

by Adam Berger, John Lafferty
"... We propose a new probabilistic approach to information retrieval based upon the ideas and methods of statistical machine translation. The central ingredient in this approach is a statistical model of how a user might distill or "translate" a given document into a query. To assess the rele ..."
Abstract - Cited by 313 (6 self) - Add to MetaCart
We propose a new probabilistic approach to information retrieval based upon the ideas and methods of statistical machine translation. The central ingredient in this approach is a statistical model of how a user might distill or "translate" a given document into a query. To assess

TileBars: Visualization of Term Distribution Information in Full Text Information Access

by Marti A. Hearst , 1995
"... The field of information retrieval has traditionally focused on textbases consisting of titles and abstracts. As a consequence, many underlying assumptions must be altered for retrieval from full-length text collections. This paper argues for making use of text structure when retrieving from full te ..."
Abstract - Cited by 341 (10 self) - Add to MetaCart
text documents, and presents a visualization paradigm, called TileBars, that demonstrates the usefulness of explicit term distribution information in Boolean-type queries. TileBars simultaneously and compactly indicate relative document length, query term frequency, and query term distribution

NeTra: A toolbox for navigating large image databases

by Wei-ying Ma, B.S. Manjunath - Multimedia Systems , 1999
"... . We present here an implementation of NeTra, a prototype image retrieval system that uses color, texture, shape and spatial location information in segmented image regions to search and retrieve similar regions from the database. A distinguishing aspect of this system is its incorporation of a robu ..."
Abstract - Cited by 382 (15 self) - Add to MetaCart
. We present here an implementation of NeTra, a prototype image retrieval system that uses color, texture, shape and spatial location information in segmented image regions to search and retrieve similar regions from the database. A distinguishing aspect of this system is its incorporation of a

Efficient Filtering of XML Documents for Selective Dissemination of Information

by Mehmet Altınel , 2000
"... Information Dissemination applications are gaining increasing popularity due to dramatic improvements in communications bandwidth and ubiquity. The sheer volume of data available necessitates the use of selective approaches to dissemination in order to avoid overwhelming users with unnecessaryi ..."
Abstract - Cited by 364 (17 self) - Add to MetaCart
with unnecessaryinformation. Existing mechanisms for selective dissemination typically rely on simple keyword matching or "bag of words" information retrieval techniques. The advent of XML as a standard for information exchangeand the development of query languages for XML data enables the development of more

On supporting containment queries in relational database management systems

by Chun Zhang, Jeffrey Naughton, David Dewitt, Qiong Luo , 2001
"... Virtually all proposals for querying XML include a class of query we term “containment queries”. It is also clear that in the foreseeable future, a substantial amount of XML data will be stored in relational database systems. This raises the question of how to support these containment queries. The ..."
Abstract - Cited by 278 (6 self) - Add to MetaCart
. The inverted list technology that underlies much of Information Retrieval is well-suited to these queries, but should we implement this technology (a) in a separate loosely-coupled IR engine, or (b) using the native tables and query execution machinery of the RDBMS? With option (b), more than twenty years
Results 1 - 10 of 3,131