Sixth International Conference on Parallel and Distributed Computing Applications and Technologies (PDCAT'05) Approximating Spanning Trees with Inner Nodes Cost Dalian, China December 05-December 08 ISBN: 0-7695-2405-2
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/PDCAT.2005.91
We consider the practical NP-complete problem of finding a minimum weight spanning tree with both edge weights and inner nodes weights. We present two polynomial time algorithms with approximation factors of 2.35 ? ln n and 2Hn, respectively, where n is the number of nodes in the graph and Hn is the n-th Harmonic number. This nearly matches the lower bound of (l-\in )Hn, for any \in \ge 0. We also give an approximation algorithm with approximation factor \Delta - 1, where \Delta is the maximum degree of the graph. For metric spaces, we give a 3.105-approximation algorithm and show that an approximation factor of 1.463 is impossible unless {NP \subseteq DTIME[n^{O(\log longn)} ]}.
Citation:
Rudolf Fleischer, Qi Ge, Jian Li, Shijun Tian, Haitao Wang, "Approximating Spanning Trees with Inner Nodes Cost," pdcat, pp.660-664, Sixth International Conference on Parallel and Distributed Computing Applications and Technologies (PDCAT'05), 2005 Usage of this product signifies your acceptance of the Terms of Use. | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||