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• W2400871750 abstract "Railway transportation and in particular train timetabling is one of the basic and source application areas of combinatorial optimization and integer programming. We will discuss two well established modeling techniques for the train timetabling problem. In this paper we focus on one major ingredient - the bounding by dual relaxations. We compare two classical dual relaxations of large scale time expanded train timetabling problems - the Lagrangean Dual and Lagrangean Decomposition. We discuss the convergence behavior and show limitations of the Lagrangean Decomposition approach for a configuration based model. We introduce a third dualization approach to overcome those limitations. Finally, we present promising preliminary computational experiments that show that our new approach indeed has superior convergence properties." @default.
• W2400871750 created "2016-06-24" @default.
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• W2400871750 date "2015-04-09" @default.
• W2400871750 modified "2023-09-24" @default.
• W2400871750 title "Comparing two dual relaxations of large scale train timetabling problems" @default.
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• W2400871750 hasPublicationYear "2015" @default.
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