Network Design with Weighted Degree Constraints

  • Authors:
  • Takuro Fukunaga;Hiroshi Nagamochi

  • Affiliations:
  • Department of Applied Mathematics and Physics, Graduate School of Informatics, Kyoto University, Japan;Department of Applied Mathematics and Physics, Graduate School of Informatics, Kyoto University, Japan

  • Venue:
  • WALCOM '09 Proceedings of the 3rd International Workshop on Algorithms and Computation
  • Year:
  • 2009

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Abstract

In an undirected graph G = (V,E) with a weight function $w: E \times V \rightarrow \mathbb Q_+$, the weighted degree d w (v;E) of a vertex v is defined as ∑ {w(e,v) |e ∈ E incident with v}. In this paper, we consider a network design problem which has upper-bounds on weighted degrees of vertices as its constraints while the objective is to compute a minimum cost graph with a prescribed connectivity. We propose bi-criteria approximation algorithms based on the iterative rounding, which has been successfully applied to the degree-bounded network design problem. A problem minimizing the maximum weighted degree of vertices is also discussed.