Approximation Schemes for Node-Weighted Geometric Steiner Tree Problems
Approximation Schemes for Node-Weighted Geometric Steiner Tree Problems
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DOI:
10.1007/s00453-007-9114-6
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发表时间:
2005-08
期刊:
影响因子:
1.1
通讯作者:
J. Remy;A. Steger
中科院分区:
文献类型:
--
作者:
J. Remy;A. Steger
In this paper we introduce a new technique for approximation schemes for geometrical optimization problems. As an example problem, we consider the following variant of the geometric Steiner tree problem. Every pointuwhich is not included in the tree costs a penalty ofπ(u) units. Furthermore, every Steiner point that we use costscSunits. The goal is to minimize the total length of the tree plus the penalties. Our technique yields a polynomial time approximation scheme for the problem, if the points lie in the plane.