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WOLLIC
2010
Springer
14 years 3 months ago
On the Role of the Complementation Rule for Data Dependencies over Incomplete Relations
Recently, an axiomatization for functional dependencies (FDs) and multivalued dependencies (MVDs) has been established where arbitrary attributes can be specified as NOT NULL. Tha...
Flavio Ferrarotti, Sven Hartmann, Sebastian Link
PDP
2008
IEEE
14 years 4 months ago
Distributed Sparse Spatial Selection Indexes
Searching for similar objects in metric-space databases can be efficiently solved by using index data structures. A number of alternative sequential indexes have been proposed in...
Veronica Gil Costa, Mauricio Marín
ICDT
2012
ACM
293views Database» more  ICDT 2012»
12 years 14 days ago
On the complexity of query answering over incomplete XML documents
Previous studies of incomplete XML documents have identified three main sources of incompleteness – in structural information, data values, and labeling – and addressed data ...
Amélie Gheerbrant, Leonid Libkin, Tony Tan
KDD
2012
ACM
238views Data Mining» more  KDD 2012»
12 years 15 days ago
Multi-source learning for joint analysis of incomplete multi-modality neuroimaging data
Incomplete data present serious problems when integrating largescale brain imaging data sets from different imaging modalities. In the Alzheimer’s Disease Neuroimaging Initiativ...
Lei Yuan, Yalin Wang, Paul M. Thompson, Vaibhav A....
SIGMOD
2002
ACM
124views Database» more  SIGMOD 2002»
14 years 10 months ago
Quadtree and R-tree indexes in oracle spatial: a comparison using GIS data
Spatial indexing has been one of the active focus areas in recent database research. Several variants of Quadtree and R-tree indexes have been proposed in database literature. In ...
Kothuri Venkata Ravi Kanth, Siva Ravada, Daniel Ab...