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125
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SIGMOD
2004
ACM
188views Database» more  SIGMOD 2004»
16 years 3 months ago
Online Event-driven Subsequence Matching over Financial Data Streams
Subsequence similarity matching in time series databases is an important research area for many applications. This paper presents a new approximate approach for automatic online s...
Huanmei Wu, Betty Salzberg, Donghui Zhang
150
Voted
PODS
2001
ACM
135views Database» more  PODS 2001»
16 years 3 months ago
On the Complexity of Join Predicates
We consider the complexity of join problems, focusing on equijoins, spatial-overlap joins, and set-containment joins. We use a graph pebbling model to characterize these joins com...
Jin-yi Cai, Venkatesan T. Chakaravarthy, Raghav Ka...
118
Voted
PODS
2003
ACM
116views Database» more  PODS 2003»
16 years 3 months ago
On nearest neighbor indexing of nonlinear trajectories
In recent years, the problem of indexing mobile objects has assumed great importance because of its relevance to a wide variety of applications. Most previous results in this area...
Charu C. Aggarwal, Dakshi Agrawal
147
Voted
SODA
2010
ACM
202views Algorithms» more  SODA 2010»
16 years 1 months ago
Counting Inversions, Offline Orthogonal Range Counting, and Related Problems
We give an O(n lg n)-time algorithm for counting the number of inversions in a permutation on n elements. This improves a long-standing previous bound of O(n lg n/ lg lg n) that ...
Timothy M. Chan, Mihai Patrascu
113
Voted
EUROGRAPHICS
2010
Eurographics
16 years 23 days ago
Sketching Clothoid Splines Using Shortest Paths
Clothoid splines are gaining popularity as a curve representation due to their intrinsically pleasing curvature, which varies piecewise linearly over arc length. However, construc...
Ilya Baran, Jaakko Lehtinen, Jovan Popovic