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Documents authored by Winter, Felix

Document
DOI: 10.4230/LIPIcs.CP.2022.41
Modeling and Solving Parallel Machine Scheduling with Contamination Constraints in the Agricultural Industry

Authors: Felix Winter, Sebastian Meiswinkel, Nysret Musliu, and Daniel Walkiewicz

Published in: LIPIcs, Volume 235, 28th International Conference on Principles and Practice of Constraint Programming (CP 2022)

Abstract
Modern-day factories of the agricultural industry need to produce and distribute large amounts of compound feed to handle the daily demands of livestock farming. As a highly-automated production process is utilized to fulfill the large-scale requirements in this domain, finding efficient machine schedules is a challenging task which requires the consideration of complex constraints and the execution of optional cleaning jobs to prevent a contamination of the final products. Furthermore, it is critical to minimize job tardiness in the schedule, since the truck routes which are used to distribute the products to customers are sensitive to delays. Thus, there is a strong need for efficient automated methods which are able to produce optimized schedules in this domain. This paper formally introduces a novel real-life problem from this area and investigates constraint-modeling techniques as well as a metaheuristic approach to efficiently solve practical scenarios. In particular, we investigate two innovative constraint programming model variants as well as a mixed integer quadratic programming formulation to model the contamination constraints which require an efficient utilization of variables with a continuous domain. To tackle large-scale instances, we additionally provide a local search approach based on simulated annealing that utilizes problem-specific neighborhood operators. We provide a set of new real-life problem instances that we use in an extensive experimental evaluation of all proposed approaches. Computational results show that our models can be successfully used together with state-of-the-art constraint solvers to provide several optimal results as well as high-quality bounds for many real-life instances. Additionally, the proposed metaheuristic approach could reach many optimal results and delivers the best upper bounds on many of the large practical instances in our experiments.
Cite as

Felix Winter, Sebastian Meiswinkel, Nysret Musliu, and Daniel Walkiewicz. Modeling and Solving Parallel Machine Scheduling with Contamination Constraints in the Agricultural Industry. In 28th International Conference on Principles and Practice of Constraint Programming (CP 2022). Leibniz International Proceedings in Informatics (LIPIcs), Volume 235, pp. 41:1-41:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2022)

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@InProceedings{winter_et_al:LIPIcs.CP.2022.41,
  author =	{Winter, Felix and Meiswinkel, Sebastian and Musliu, Nysret and Walkiewicz, Daniel},
  title =	{{Modeling and Solving Parallel Machine Scheduling with Contamination Constraints in the Agricultural Industry}},
  booktitle =	{28th International Conference on Principles and Practice of Constraint Programming (CP 2022)},
  pages =	{41:1--41:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-240-2},
  ISSN =	{1868-8969},
  year =	{2022},
  volume =	{235},
  editor =	{Solnon, Christine},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CP.2022.41},
  URN =		{urn:nbn:de:0030-drops-166701},
  doi =		{10.4230/LIPIcs.CP.2022.41},
  annote =	{Keywords: Parallel Machine Scheduling, Contamination Constraints, Constraint Programming, Mixed Integer Quadratic Progamming, Metaheuristics, Local Search, Simulated Annealing}
}
Document
DOI: 10.4230/LIPIcs.CP.2021.37
Minimizing Cumulative Batch Processing Time for an Industrial Oven Scheduling Problem

Authors: Marie-Louise Lackner, Christoph Mrkvicka, Nysret Musliu, Daniel Walkiewicz, and Felix Winter

Published in: LIPIcs, Volume 210, 27th International Conference on Principles and Practice of Constraint Programming (CP 2021)

Abstract
We introduce the Oven Scheduling Problem (OSP), a new parallel batch scheduling problem that arises in the area of electronic component manufacturing. Jobs need to be scheduled to one of several ovens and may be processed simultaneously in one batch if they have compatible requirements. The scheduling of jobs must respect several constraints concerning eligibility and availability of ovens, release dates of jobs, setup times between batches as well as oven capacities. Running the ovens is highly energy-intensive and thus the main objective, besides finishing jobs on time, is to minimize the cumulative batch processing time across all ovens. This objective distinguishes the OSP from other batch processing problems which typically minimize objectives related to makespan, tardiness or lateness. We propose to solve this NP-hard scheduling problem via constraint programming (CP) and integer linear programming (ILP) and present corresponding CP- and ILP-models. For an experimental evaluation, we introduce a multi-parameter random instance generator to provide a diverse set of problem instances. Using state-of-the-art solvers, we evaluate the quality and compare the performance of our CP- and ILP-models, which could find optimal solutions for many instances. Furthermore, using our models we are able to provide upper bounds for the whole benchmark set including large-scale instances.
Cite as

Marie-Louise Lackner, Christoph Mrkvicka, Nysret Musliu, Daniel Walkiewicz, and Felix Winter. Minimizing Cumulative Batch Processing Time for an Industrial Oven Scheduling Problem. In 27th International Conference on Principles and Practice of Constraint Programming (CP 2021). Leibniz International Proceedings in Informatics (LIPIcs), Volume 210, pp. 37:1-37:18, Schloss Dagstuhl – Leibniz-Zentrum für Informatik (2021)

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@InProceedings{lackner_et_al:LIPIcs.CP.2021.37,
  author =	{Lackner, Marie-Louise and Mrkvicka, Christoph and Musliu, Nysret and Walkiewicz, Daniel and Winter, Felix},
  title =	{{Minimizing Cumulative Batch Processing Time for an Industrial Oven Scheduling Problem}},
  booktitle =	{27th International Conference on Principles and Practice of Constraint Programming (CP 2021)},
  pages =	{37:1--37:18},
  series =	{Leibniz International Proceedings in Informatics (LIPIcs)},
  ISBN =	{978-3-95977-211-2},
  ISSN =	{1868-8969},
  year =	{2021},
  volume =	{210},
  editor =	{Michel, Laurent D.},
  publisher =	{Schloss Dagstuhl -- Leibniz-Zentrum f{\"u}r Informatik},
  address =	{Dagstuhl, Germany},
  URL =		{https://drops.dagstuhl.de/entities/document/10.4230/LIPIcs.CP.2021.37},
  URN =		{urn:nbn:de:0030-drops-153286},
  doi =		{10.4230/LIPIcs.CP.2021.37},
  annote =	{Keywords: Oven Scheduling Problem, Parallel Batch Processing, Constraint Programming, Integer Linear Programming}
}
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