154 search results - page 4 / 31 » Near Best Tree Approximation |
CORR
2010
Springer
13 years 7 months ago
2010
Springer
Given a directed graph G with non negative cost on the arcs, a directed tree cover of G is a directed tree such that either head or tail (or both of them) of every arc in G is touc...
WDAG
2009
Springer
14 years 1 days ago
2009
Springer
Abstract. An (α, β)-spanner of a graph G is a subgraph H that approximates distances in G within a multiplicative factor α and an additive error β, ensuring that for any two no...
COCOON
2005
Springer
14 years 1 months ago
2005
Springer
The terminal Steiner tree problem (TST) consists of finding a minimum cost Steiner tree where each terminal is a leaf. We describe a factor 2ρ−ρ/(3ρ−2) approximation algor...
STOC
1996
ACM
13 years 11 months ago
1996
ACM
We significantly improve known time bounds for solving the minimum cut problem on undirected graphs. We use a "semiduality" between minimum cuts and maximum spanning tree...
TAMC
2007
Springer
14 years 1 months ago
2007
Springer
Abstract. We investigate the group key management problem for broadcasting applications. Previous work showed that, in handling key updates, batch rekeying can be more cost-effect...