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IPL
2007
80views more  IPL 2007»
15 years 1 months ago
Execution time analysis of a top-down R-tree construction algorithm
A detailed CPU execution-time analysis and implementation are given for a bulk loading algorithm to construct R-trees due to García et al. [Y.J. García, M.A. López, S.T. Leuten...
Houman Alborzi, Hanan Samet
IPL
2007
96views more  IPL 2007»
15 years 1 months ago
Fault diameter of product graphs
The (k − 1)-fault diameter Dk(G) of a k-connected graph G is the maximum diameter of an induced subgraph by deleting at most k − 1 vertices from G. This paper considers the fa...
Jun-Ming Xu, Chao Yang
IPL
2006
153views more  IPL 2006»
15 years 1 months ago
Oriented vertex and arc colorings of outerplanar graphs
A homomorphism from an oriented graph G to an oriented graph H is an arc-preserving mapping from V (G) to V (H), that is (x)(y) is an arc in H whenever xy is an arc in G. The orie...
Alexandre Pinlou, Eric Sopena
IPL
2006
87views more  IPL 2006»
15 years 1 months ago
Vertex rankings of chordal graphs and weighted trees
: In this paper we consider the vertex ranking problem of weighted trees. We show that this problem is strongly NP-hard. We also give a polynomial-time reduction from the problem o...
Dariusz Dereniowski, Adam Nadolski
IPL
2006
97views more  IPL 2006»
15 years 1 months ago
A fixed-parameter tractability result for multicommodity demand flow in trees
We study an NP-hard (and MaxSNP-hard) problem in trees--Multicommodity Demand Flow--dealing with demand flows between pairs of nodes and trying to maximize the value of the routed...
Jiong Guo, Rolf Niedermeier