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PODS
2007
ACM
159views Database» more  PODS 2007»
16 years 2 months ago
Generalized hypertree decompositions: np-hardness and tractable variants
The generalized hypertree width GHW(H) of a hypergraph H is a measure of its cyclicity. Classes of conjunctive queries or constraint satisfaction problems whose associated hypergr...
Georg Gottlob, Thomas Schwentick, Zoltán Mi...
JASIS
2006
91views more  JASIS 2006»
15 years 1 months ago
Written versus spoken queries: A qualitative and quantitative comparative analysis
This paper reports on an experimental study on the differences between spoken and written queries. A set of written and spontaneous spoken queries are generated by users from writ...
Fabio Crestani, Heather Du
ECIR
2009
Springer
14 years 11 months ago
Studying Query Expansion Effectiveness
Query expansion is an effective technique in improving the retrieval performance for ad-hoc retrieval. However, query expansion can also fail, leading to a degradation of the retri...
Ben He, Iadh Ounis
ACL
2009
14 years 11 months ago
Query-Focused Summaries or Query-Biased Summaries?
In the context of the Document Understanding Conferences, the task of Query-Focused Multi-Document Summarization is intended to improve agreement in content among humangenerated m...
Rahul Katragadda, Vasudeva Varma
ICDE
2012
IEEE
202views Database» more  ICDE 2012»
13 years 4 months ago
Differentially Private Spatial Decompositions
— Differential privacy has recently emerged as the de facto standard for private data release. This makes it possible to provide strong theoretical guarantees on the privacy and ...
Graham Cormode, Cecilia M. Procopiuc, Divesh Sriva...