Titlebook: Operations Research Proceedings 2011; Selected Papers of t Diethard Klatte,Hans-Jakob Lüthi,Karl Schmedders Conference proceedings 2012 Spr

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Inverse Shortest Path Models Based on Fundamental Cycle Bases graph and a set of paths the problem is to find arc costs such that all specified paths are shortest paths. The quality of the arc costs is measured by the deviation from some ideal arc costs. Our contribution is a novel modeling technique for this problem based on fundamental cycle bases. For ’LP

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Estimating trenching costs in FTTx network planning purpose we present an extended Steiner tree model. Using a variety of realistic problem instances we demonstrate that the total trenching cost can only be reduced by about 5 percent in realistic scenarios. This work has been funded by BMBF (German Federal Ministry of Education and Research) within

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Necessary Optimality Conditions for Improper Infinite-Horizon Control Problemsand the growth rate of the objective function is satisfied. The main novelty is that the result applies to general non-stationary systems and the optimal objective value needs not be finite (in which case the concept of overtaking optimality is employed).

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Rounding and Propagation Heuristics for Mixed Integer Programmingroaches. To assess the impact of these primal heuristics on the ability to find feasible solutions, in particular early during search, we introduce a new performance measure, the .. Computational experiments evaluate this and other measures on MIPLIB 2010 benchmark instances.

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Why pairwise comparison methods may fail in MCDM rankingsommon to all criteria. MCDM methodologies based on pair-wise comparison methods are on the contrary not providing the correct rankings in many practical situations. The roots of the observed failures are made clearer for the well-known Promethee method by means of a simple example.

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Conference proceedings 2012 University of Zurich from August 30 to September 2, 2011. The conference was jointly organized by the German speaking OR societies from Austria (?GOR), Germany (GOR) and Switzerland (SVOR) under the patronage of SVOR. More than 840 scientists and students from over 50 countries attended OR 2011 and