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ICDT
2009
ACM
130views Database» more  ICDT 2009»
16 years 7 months ago
Towards a theory of search queries
The need to manage diverse information sources has triggered the rise of very loosely structured data models, known as "dataspace models." Such information management sy...
George H. L. Fletcher, Jan Van den Bussche, Dirk V...
ICDT
2009
ACM
149views Database» more  ICDT 2009»
16 years 7 months ago
Query languages for data exchange: beyond unions of conjunctive queries
The class of unions of conjunctive queries (UCQ) has been shown to be particularly well-behaved for data exchange; its certain answers can be computed in polynomial time (in terms...
Juan Reutter, Marcelo Arenas, Pablo Barceló
ICDT
2009
ACM
125views Database» more  ICDT 2009»
16 years 7 months ago
How big must complete XML query languages be?
Marx and de Rijke have shown that the navigational core of the w3c XML query language XPath is not first-order complete ? that is it cannot express every query definable in firsto...
Clemens Ley, Michael Benedikt
ICDT
2009
ACM
147views Database» more  ICDT 2009»
16 years 7 months ago
The average-case complexity of counting distinct elements
We continue the study of approximating the number of distinct elements in a data stream of length n to within a (1? ) factor. It is known that if the stream may consist of arbitra...
David P. Woodruff
ISBI
2008
IEEE
16 years 7 months ago
System sensitivity in preclinical small animal imaging
Preclinical small animal imaging is an important tool at the disposition of biological researchers. While the range of studies performed by non-invasive preclinical imaging is gre...
Arion-Xenofon Chatziioannou, Nicolas A. Karakatsan...
ISBI
2008
IEEE
16 years 7 months ago
Increased sensitivity in FMRI group analysis using mixed-effect modeling
In functional Magnetic Resonance Imaging group studies, uncertainties on the individual BOLD responses are not taken into account by standard detection procedures, which may limit...
Merlin Keller, Alexis Roche
ISBI
2008
IEEE
16 years 7 months ago
Analysis and mitigation of calcium artifacts in cardiac multidetector CT
Multi-detector Computed Tomography offers the promise of a non-invasive alternative to invasive coronary angiography for the evaluation of coronary artery disease. An impediment p...
Zhuangli Liang, W. Clem Karl, Synho Do, Thomas Bra...
ISBI
2008
IEEE
16 years 7 months ago
Visualizing morphogenesis and growth by temporal interpolation of surface-based 3D atlases
Image-based 3D atlases have been proven to be very useful in biological and medical research. They serve as spatial reference systems that enable researchers to integrate experime...
Chavdar Papazov, Vincent J. Dercksen, Hans Lamecke...
ISBI
2008
IEEE
16 years 7 months ago
Comparison of fractional and geodesic anisotropy in diffusion tensor images of 90 monozygotic and dizygotic twins
We used diffusion tensor magnetic resonance imaging (DTI) to reveal the extent of genetic effects on brain fiber microstructure, based on tensor-derived measures, in 22 pairs of m...
Agatha D. Lee, Natasha Lepore, Marina Barysheva, Y...
ISBI
2008
IEEE
16 years 7 months ago
Classification of breast-tissue microarray spots using colour and local invariants
Telmo Amaral, Stephen J. McKenna, Katherine Robert...