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ICDE
2007
IEEE
117views Database» more  ICDE 2007»
16 years 8 months ago
Unnesting Scalar SQL Queries in the Presence of Disjunction
Optimizing nested queries is an intricate problem. It becomes even harder if in a nested query the linking predicate or the correlation predicate occurs disjunctively. We present ...
Matthias Brantner, Norman May, Guido Moerkotte
ICDE
2006
IEEE
177views Database» more  ICDE 2006»
16 years 8 months ago
Closest-Point-of-Approach Join for Moving Object Histories
In applications that produce a large amount of data describing the paths of moving objects, there is a need to ask questions about the interaction of objects over a long recorded ...
Subramanian Arumugam, Chris Jermaine
ICDE
2001
IEEE
143views Database» more  ICDE 2001»
16 years 8 months ago
Exactly-once Semantics in a Replicated Messaging System
A distributed message delivery system can use replication to improve performance and availability. However, without safeguards, replicated messages may be delivered to a mobile de...
Yongqiang Huang, Hector Garcia-Molina
ICDE
1999
IEEE
113views Database» more  ICDE 1999»
16 years 8 months ago
I/O Complexity for Range Queries on Region Data Stored Using an R-tree
In this paper we study the node distribution of an Rtree storing region data, like for instance islands, lakes or human-inhabited areas. We will show that real region datasets are...
Guido Proietti, Christos Faloutsos
ICPR
2008
IEEE
16 years 8 months ago
Lexicon-based offline recognition of Amharic words in unconstrained handwritten text
This paper describes an offline handwriting recognition system for Amharic words based on lexicon. The system computes direction fields of scanned handwritten documents, from whic...
Yaregal Assabie, Josef Bigün