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AMW
2009
15 years 6 months ago
Data Expiration and Aggregate Queries
We investigate the space requirements for summaries needed for maintaining exact answers to aggregate queries over histories of relational databases. We show that, in general, a su...
David Toman
BNCOD
2009
97views Database» more  BNCOD 2009»
15 years 6 months ago
An XML-Based Model for Supporting Context-Aware Query and Cache Management
Abstract. Database systems (DBSs) can play an essential role in facilitating the query and cache management in context-aware mobile information systems (CAMIS). Two of the fundamen...
Essam Mansour, Hagen Höpfner
MMS
2006
15 years 5 months ago
Update Relevance under the Multiset Semantics of RDBMS
: In order to reduce transmission costs and response time, mobile clients typically cache data locally. But, avoiding the usage of outdated data and maintaining the consistency of ...
Hagen Höpfner
PAMI
2008
144views more  PAMI 2008»
15 years 5 months ago
Twin Kernel Embedding
Visualization of non-vectorial objects is not easy in practice due to their lack of convenient vectorial representation. Representative approaches are Kernel PCA and Kernel Laplac...
Yi Guo, Junbin Gao, Paul W. Kwan
CN
2000
63views more  CN 2000»
15 years 5 months ago
Squeal: a structured query language for the Web
The Web contains an abundance of useful semi-structured information that can and should be mined. Types of structure include hyperlinks between pages, structure within hypertext p...
Ellen Spertus, Lynn Andrea Stein