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Articles in Refereed Conference Proceedings

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]

Journal Articles

On Eulerian extensions and their application to no-wait flowshop scheduling
Citation key HoehnJacobsMegow2012
Author Höhn, Wiebke and Jacobs, Tobias and Megow, Nicole
Pages 295-309
Year 2012
DOI 10.1007/s10951-011-0241-1
Journal Journal of Scheduling
Volume 15
Number 3
Publisher Springer
Abstract We consider a variant of no-wait flowshop scheduling that is motivated by continuous casting in the multistage production process in steel manufacturing. The task is to find a feasible schedule with a minimum number of interruptions, i.e., continuous idle time intervals on the last production stage. Based on an interpretation as Eulerian Extension Problems, we fully settle the complexity status of any particular problem case: We give a very intuitive optimal algorithm for scheduling on two processing stages with one machine in the first stage, and we show that all other problem variants are strongly NP-hard. We also discuss alternative idle time related scheduling models and their justification in the considered steel manufacturing environment. Here, we derive constant factor approximations.
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