87 search results - page 4 / 18 » Constant Approximation Algorithms for Embedding Graph Metric... |
COMPGEOM
2009
ACM
14 years 1 months ago
2009
ACM
It was shown in [11] that any orientable graph of genus g can be probabilistically embedded into a graph of genus g − 1 with constant distortion. Removing handles one by one giv...
WADS
2007
Springer
14 years 24 days ago
2007
Springer
We present a polynomial-time approximation scheme (PTAS) for the Steiner tree problem with polygonal obstacles in the plane with running time O(n log2 n), where n denotes the numb...
ICALP
2009
Springer
14 years 7 months ago
2009
Springer
We improve the approximation ratios for two optimization problems in planar graphs. For node-weighted Steiner tree, a classical network-optimization problem, the best achievable ap...
APPROX
2010
Springer
13 years 7 months ago
2010
Springer
We give the first constant-factor approximation algorithm for Sparsest-Cut with general demands in bounded treewidth graphs. In contrast to previous algorithms, which rely on the f...
COMBINATORICA
2010
13 years 4 months ago
2010
In this paper, we propose a simple and natural randomized algorithm to embed a tree T in a given graph G. The algorithm can be viewed as a "self-avoiding tree-indexed random ...