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Publikationen

Publikationen in Konferenzbänden

Höhn, W., Mestre, J. and Wiese, A.
How Unsplittable-Flow-Covering helps Scheduling with Job-Dependent Cost Functions [1].
In Proc. of the 41st International Colloquium on Automata, Languages, and Programming (ICALP), LNCS, Vol. 8572, pp. 625-636, Springer, 2014.  [pdf] [2]

Höhn, W. and Jacobs, T.
An experimental and analytical study of order constraints for single machine scheduling with quadratic cost [3].
In Proc. of the 14th Workshop on Algorithm Engineering and Experiments (ALENEX), pp. 103-117, SIAM, 2012.  [pdf] [4]

Höhn, W. and Jacobs, T.
On the performance of Smith's rule in single-machine scheduling with nonlinear cost [5].
In Proc. of the 10th Latin American Theoretical Informatics Symposium (LATIN), LNCS, Vol. 7256, pp. 482-493, Springer, 2012.  [pdf] [6]

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.
Link zur Publikation [7] Link zur Originalpublikation [8] Download Bibtex Eintrag [9]

Zurück [10]

Doktorarbeit

Höhn, W.
Complex Single Machine Scheduling: Theoretical and Practical Aspects of Sequencing [11].
PhD thesis, TU Berlin, 2013.  [pdf] [12]

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