651 search results - page 54 / 131 » Algebraic Query Optimization for Distributed Top-k Queries |
AMW
2010
13 years 10 months ago
2010
In this work we present in-network techniques to improve the efficiency of spatial aggregate queries. Such queries are very common in a sensornet setting, demanding more targeted t...
GIS
2008
ACM
13 years 10 months ago
2008
ACM
In this paper we study in-network query processing in disconnected mobile environments, where both ad-hoc communication and infrastructure communication are available. Depending o...
ICDE
2011
IEEE
13 years 15 days ago
2011
IEEE
— In this paper, we study the problem of efficiently computing multiple aggregation queries over a data stream. In order to share computation, prior proposals have suggested ins...
GEOINFORMATICA
2006
13 years 9 months ago
2006
Existing estimation approaches for spatial databases often rely on the assumption that data distribution in a small region is uniform, which seldom holds in practice. Moreover, the...
ICDE
2006
IEEE
14 years 3 months ago
2006
IEEE
It has been well recognized that data mining is an interactive and iterative process. In order to support this process, one of the long-term goals of data mining research has been...