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Inhalt des Dokuments


Publikationen in Konferenzbänden

Höhn, W., Mestre, J. and Wiese, A.
How Unsplittable-Flow-Covering helps Scheduling with Job-Dependent Cost Functions.
In Proc. of the 41st International Colloquium on Automata, Languages, and Programming (ICALP), LNCS, Vol. 8572, pp. 625-636, Springer, 2014.  [pdf]

Höhn, W. and Jacobs, T.
An experimental and analytical study of order constraints for single machine scheduling with quadratic cost.
In Proc. of the 14th Workshop on Algorithm Engineering and Experiments (ALENEX), pp. 103-117, SIAM, 2012.  [pdf]

Höhn, W. and Jacobs, T.
On the performance of Smith's rule in single-machine scheduling with nonlinear cost.
In Proc. of the 10th Latin American Theoretical Informatics Symposium (LATIN), LNCS, Vol. 7256, pp. 482-493, Springer, 2012.  [pdf]

Publikationen in Journalen

Integrated Sequencing and Scheduling in Coil Coating
Zitatschlüssel HoehnKoenigLuebbecke+2011
Autor Höhn, Wiebke and König, Felix G. and Lübbecke, Marco E. and Möhring, Rolf H.
Seiten 647–666
Jahr 2011
DOI 10.1287/mnsc.1100.1302
Journal Management Science
Jahrgang 57
Nummer 4
Notiz Finalist for the EURO Excellence in Practice Award 2009
Verlag Informs
Zusammenfassung We consider a complex planning problem in integrated steel production. A sequence of coils of sheet metal needs to be color coated in consecutive stages. Different coil geometries and changes of colors necessitate time-consuming setup work. In most coating stages one can choose between two parallel color tanks. This can either reduce the number of setups needed or enable setups concurrent with production. A production plan comprises the sequencing of coils and the scheduling of color tanks and setup work. The aim is to minimize the makespan for a given set of coils. We present an optimization model for this integrated sequencing and scheduling problem. A core component is a graph theoretical model for concurrent setup scheduling. It is instrumental for building a fast heuristic that is embedded into a genetic algorithm to solve the sequencing problem. The quality of our solutions is evaluated via an integer program based on a combinatorial relaxation, showing that our solutions are within 10% of the optimum. Our algorithm is implemented at Salzgitter Flachstahl GmbH, a major German steel producer. This has led to an average reduction in makespan by over 13% and has greatly exceeded expectations.
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