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COMBINATORICA
2010
13 years 4 months ago
Approximation algorithms via contraction decomposition
We prove that the edges of every graph of bounded (Euler) genus can be partitioned into any prescribed number k of pieces such that contracting any piece results in a graph of bou...
Erik D. Demaine, MohammadTaghi Hajiaghayi, Bojan M...
BMCBI
2010
112views more  BMCBI 2010»
13 years 9 months ago
A boundary delimitation algorithm to approximate cell soma volumes of bipolar cells from topographical data obtained by scanning
Background: Cell volume determination plays a pivotal role in the investigation of the biophysical mechanisms underlying various cellular processes. Whereas light microscopy in pr...
Patrick Happel, Kerstin Moller, Ralf Kunz, Irmgard...
COMPUTING
2008
174views more  COMPUTING 2008»
13 years 9 months ago
Multilevel algorithms for Rannacher-Turek finite element approximation of 3D elliptic problems
Generalizing the approach of a previous work [15] the authors present multilevel preconditioners for three-dimensional (3D) elliptic problems discretized by a family of Rannacher ...
Ivan Georgiev, Johannes Kraus, Svetozar Margenov
ICIP
2003
IEEE
14 years 10 months ago
Algorithms for stochastic approximations of curvature flows
Curvature flows have been extensively considered from a deterministic point of view. They have been shown to be useful for a number of applications including crystal growth, flame...
Gozde B. Unal, Delphine Nain, G. Ben-Arous, Nahum ...
FOCS
2009
IEEE
14 years 4 months ago
Improved Approximation Algorithms for PRIZE-COLLECTING STEINER TREE and TSP
Aaron Archer, MohammadHossein Bateni, Mohammad Tag...