Department of Computer Science | Institute of Theoretical Computer Science | CADMO

Theory of Combinatorial Algorithms

Prof. Emo Welzl and Prof. Bernd Gärtner

Mittagsseminar (in cooperation with A. Steger, D. Steurer and B. Sudakov)

Mittagsseminar Talk Information

Date and Time: Thursday, December 18, 2008, 12:15 pm

Duration: This information is not available in the database

Location: OAT S15/S16/S17

Speaker: Zhen Hao (Univ. Heidelberg, Research Group Combinatorial Optimization)

Construction of a PTAS for the Steiner tree problem with neighborhoods in the plane

To find a shortest Steiner tree S* (with length L*) which connects a given set R of mutually disjoint, connected polygons is an NP-hard problem, called the geometric SMTN problem.

We show that we can construct a "near-optimal" Steiner tree S in polynomial running time: for a given ε > 0 we construct a PTAS (polynomial-time approximation scheme) which computes a Steiner tree S, where S connects R and has length L <= (1 + ε)L*.

The algorithm is based on a subdivision method called m-guillotine method, originally developed by J.S.B. Mitchell in 1996.

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