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LCC
1994
213views Algorithms» more  LCC 1994»
14 years 2 months ago
Linear Constraint Query Languages: Expressive Power and Complexity
We give an AC0 upper bound on the complexity of rst-oder queries over (in nite) databases de ned by restricted linear constraints. This result enables us to deduce the non-expressi...
Stéphane Grumbach, Jianwen Su, Christophe T...
JSAC
2008
70views more  JSAC 2008»
13 years 9 months ago
LMMSE turbo equalization based on factor graphs
Abstract--In this paper, a vector-form factor graph representation is derived for intersymbol interference (ISI) channels. The resultant graphs have a tree-structure that avoids th...
Qinghua Guo, Li Ping
JCSC
1998
227views more  JCSC 1998»
13 years 9 months ago
Continuous and Hybrid Petri Nets
: Continuous and hybrid Petri nets can be seen as relaxation of discrete nets, in which the firing of some or of all transitions is approximated with a fluid model. Several analysi...
Hassane Alla, René David
ICCV
2005
IEEE
14 years 11 months ago
Using Eye Reflections for Face Recognition Under Varying Illumination
Face recognition under varying illumination remains a challenging problem. Much progress has been made toward a solution through methods that require multiple gallery images of ea...
Ko Nishino, Peter N. Belhumeur, Shree K. Nayar
GLOBECOM
2007
IEEE
14 years 4 months ago
Using Type-of-Relationship (ToR) Graphs to Select Disjoint Paths in Overlay Networks
— Routing policies used in the Internet can be restrictive, limiting communication between source-destination pairs to one path, when often better alternatives exist. To avoid ro...
Sameer Qazi, Tim Moors