482 search results - page 7 / 97 » Selectivity Estimation in Spatial Databases |
GLOBECOM
2006
IEEE
14 years 2 months ago
2006
IEEE
— This paper presents non-linear precoding design in closed-loop multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) over spatiallycorrelated,...
EDBT
2006
ACM
14 years 8 months ago
2006
ACM
Given a set of N multi-dimensional points, we study the computation of -quantiles according to a ranking function F, which is provided by the user at runtime. Specifically, F compu...
ICDE
2004
IEEE
14 years 9 months ago
2004
IEEE
Queries with (equality or LIKE) selection predicates over string attributes are widely used in relational databases. However, state-of-the-art techniques for estimating selectivit...
SIGMOD
1994
ACM
14 years 22 hour ago
1994
ACM
In this paper, we propose a novel approach for estimating the record selectivities of database queries. The real attribute value distribution is adaptively approximated by a curve...
SCALESPACE
2007
Springer
14 years 2 months ago
2007
Springer
In this work, we address the problem of segmenting multiple objects, under possible occlusions, in a level set framework. A variational energy that incorporates a piecewise constan...