@inproceedings{DavendraHerrmannBialicDavendra, author = {Davendra, Donald and Herrmann, Frank and Bialic-Davendra, Magdalena}, title = {Scheduling tardiness constrained flow shop with simultaneously loaded stations using Genetic Algorithm}, series = {Proceedings of the 4th International Conference on Intelligent Systems, Metaheuristics \& Swarm Intelligence (ISMSI 2020): Thimphu, Kingdom of Bhutan during March 21-22, 2020}, booktitle = {Proceedings of the 4th International Conference on Intelligent Systems, Metaheuristics \& Swarm Intelligence (ISMSI 2020): Thimphu, Kingdom of Bhutan during March 21-22, 2020}, publisher = {ACM}, doi = {10.1145/3396474.3396475}, abstract = {In this study, a real world flow shop with a transportation restriction is regarded. This restriction reduces the set of feasible schedules even more than the no-buffer restrictions discussed in the literature in the case of limited storage. Still this problem is NP-hard. Since this scheduling problem is integrated in the usual hierarchical planning, the tardiness is minimised. Compared to even specific priority rule for this class of problems the suggested genetic algorithm delivers significant better results. The specific structure of this class of problems complicates the calculation of the performance criteria. This is solved by a simulation algorithm.}, subject = {Ablaufplanung}, language = {en} } @inproceedings{TrostClausTeichetal., author = {Trost, Marco and Claus, Thorsten and Teich, Enrico and Herrmann, Frank}, title = {Die soziale Dimension in der nachhaltigen hierarchischen Produktionsplanung - Stand der Forschung und Ans{\"a}tze zur Weiterentwicklung bestehender Planungsmodelle}, series = {Proceedings zur NAMA 2016 (NAMA 2016), October 5th - 7th, 2016, Dresden, Germany}, booktitle = {Proceedings zur NAMA 2016 (NAMA 2016), October 5th - 7th, 2016, Dresden, Germany}, pages = {4 S.}, abstract = {Bei der Produktionsplanung steht die Optimierung des Produktionssystems eines Unternehmens im Vordergrund. In diesem Beitrag wird auf Basis der hierarchischen Produktionsplanung aufgezeigt, dass neben {\"o}konomischen und {\"o}kologischen Aspekten insbesondere auch soziale Effekte bei der Entscheidungsfindung zu ber{\"u}cksichtigen sind. Dazu werden f{\"u}r die Hauptproduktionsprogrammplanung, die Losgr{\"o}ßenplanung und die Ressourcenbelegungsplanung dargelegt, welche sozialen Gr{\"o}ßen ber{\"u}cksichtigt werden k{\"o}nnen beziehungsweise bereits ber{\"u}cksichtigt sind. {\"U}berdies wird ein Modellansatz zur Hauptproduktionsprogrammplanung vorgestellt, der auf die Beseitigung identifizierter Forschungsl{\"u}cken abzielt.}, subject = {Hierarchische Produktionsplanung}, language = {de} } @inproceedings{FuchsHerrmannManitz, author = {Fuchs, Michael and Herrmann, Frank and Manitz, Michael}, title = {A Lagrangian relaxation based approach for the capacitated multi-level lot sizing problem with stochastic demands}, series = {SMMSO 2019 - 12th Conference on Stochastic Models of Manufacturing and Service Operations, June 9th - 14th, 2019, Goslar, Germany}, booktitle = {SMMSO 2019 - 12th Conference on Stochastic Models of Manufacturing and Service Operations, June 9th - 14th, 2019, Goslar, Germany}, subject = {Kapazit{\"a}tsbelegungsplanung}, language = {en} } @inproceedings{ManitzHerrmannMunninger, author = {Manitz, Michael and Herrmann, Frank and Munninger, Maximilian}, title = {Considering sequence-dependent stochasticity in production schedules}, series = {Proceedings of the International Annual Conference of the German Operations Research Society 2017 (OR 2017), Berlin, September 6 - 8, 2017}, booktitle = {Proceedings of the International Annual Conference of the German Operations Research Society 2017 (OR 2017), Berlin, September 6 - 8, 2017}, subject = {Produktionsplanung}, language = {en} } @inproceedings{TerbrackHerrmannClaus, author = {Terbrack, Hajo and Herrmann, Frank and Claus, Thorsten}, title = {Determining an optimal energy demand range within master production scheduling}, series = {Proceedings of the International Annual Conference of the German Operations Research Society 2019 (OR 2019) Dresden, September 3 - 6, 2019}, booktitle = {Proceedings of the International Annual Conference of the German Operations Research Society 2019 (OR 2019) Dresden, September 3 - 6, 2019}, subject = {Produktionsplanung}, language = {en} } @article{HerrmannReiter, author = {Herrmann, Frank and Reiter, Christian}, title = {Losbildung bei einem Engpass an Lagerfl{\"a}che im Presswerk eines Automobilzulieferers}, series = {Anwendungen und Konzepte der Wirtschaftsinformatik}, volume = {10}, journal = {Anwendungen und Konzepte der Wirtschaftsinformatik}, number = {10}, publisher = {AKWI}, issn = {2296-4592}, doi = {10.26034/lu.akwi.2019.3238}, pages = {54 -- 71}, abstract = {Die im Presswerk eines Automobilzulieferers ben{\"o}tigte Lagerfl{\"a}che stieg in den letzten Jahren so gewaltig an, dass die bisher verwendeten Produktionslose manuell reduziert werden mussten, um {\"u}berhaupt einlagern zu k{\"o}nnen. Die dadurch sich ergebenden h{\"o}heren Kosten werden quantifiziert. Zur Verbesserung werden die strukturellen Unterschiede zwischen den neuen Losen und den durch ein Standardverfahren in ERP-Systemen gelieferten Losen analysiert. Diese Unterschiede zeigen, dass die 2. Stufe in diesem 2-stufigen Vorgehen - 1. Los berechnen und dann 2. dieses geeignet reduzieren - die Entscheidungen der ersten Stufe in der Regel vollst{\"a}ndig revidiert. Ein integrativer Ansatz ist erforderlich. Dies erfolgt durch ein lineares Optimierungsmodell mit beschr{\"a}nkter Lager fl{\"a}che. Das ILOG - Tool, ein Standardwerkzeug zur L{\"o}sung linearer Optimierungsmodelle, l{\"o}st dieses Modell innerhalb von Minuten. Dass mit diesem optimalen Verfahren die Kosten substantiell verringert werden, wird simulativ nachgewiesen. Seit einigen Monaten wird dieses Verfahren im Rahmen einer rollenden Planung im Presswerk eingesetzt. Eine rollende Planung bewirkt in der Regel einen Verlust in der L{\"o}sungsg{\"u}te. In diesem Fall wurden nahezu optimale L{\"o}sungen erreicht, mit denen die Kosten substantiell verringert wurden. Die Werksleitung und die Mitarbeiter sind mit diesem neuen Verfahren sehr zufrieden.}, language = {de} } @inproceedings{TrostClausHerrmann, author = {Trost, Marco and Claus, Thorsten and Herrmann, Frank}, title = {Master production scheduling with consideration of social aspects for networking with human resources requirements planning}, series = {Proceedings of the International Annual Conference of the German Operations Research Society 2018 (OR 2018), Br{\"u}ssel, September 12 - 14, 2018}, booktitle = {Proceedings of the International Annual Conference of the German Operations Research Society 2018 (OR 2018), Br{\"u}ssel, September 12 - 14, 2018}, abstract = {A large number of current research focuses on the sustainable orientation of business processes. However, it is often neglected that, next to the ecological and economic dimension, the social dimension is also an important pillar of sustainability. Therefore, the intended contribution focuses on the integration of social aspects into the Master Production Scheduling and thus achieves a network between production planning and human resources requirements planning. The study shows that previous papers on production planning and control usually ignore the social dimension. Exceptions are works that take advantage of learning and forgetting effects at the lot-sizing and scheduling. In addition, there are various papers in the scheduling area which aim to reduce employee workload by optimizing resource allocation. Thus, however, only an optimal distribution of burden is achieved. Therefore, this paper presents a long-term management of the burden. To this end, the classic Master Production Scheduling, which has been statically limited in terms of capacity, whereby additional capacities have been used, will be expanded. At the same time, human resources requirements planning is based on assumptions regarding the expected capacity requirements. The created linear optimization model, addresses these weak points. A flexible available capacity is integrated on the basis of existing sales orders. It is making possible, to build up and reduce capacities, whereby technical restrictions (number of workplaces) and labor market conditions (number of available employees, qualification of employees and experience of employees) are also mapped. This represents a significant progress compared to previous models, whereby the target function minimizes costs. Further progress has been made in investigating the effects of exhaustion. The ratio of capacity requirements to available capacity was controlled externally as employee utilization and processing times dependent on the employee's utilization were taken into account. Subsequently, different utilization situations were examined under the assumption of different exhaustion and random demand patterns with the aim of determining an optimal employee utilization. A key finding of this study is that - contrary to common assumptions - achieving cost benefits is not necessarily associated with maximizing utilization, but rather with controlling employee utilization. An additional effect results from the reduction of the employee burden. However, the flexible capacity available does not limit the performance of the production system. In addition, we are currently working on the investigation of effects in a long-term planning horizon and of consequences for the downstream planning levels of production planning and control. Overall, the contribution presents an innovative research project that aims to integrate social aspects into production planning in order to make a contribution to truly sustainable models in the future.}, subject = {Produktionsplanung}, language = {en} } @inproceedings{TrostClausHerrmann, author = {Trost, Marco and Claus, Thorsten and Herrmann, Frank}, title = {Adapted Master Production Scheduling: Analysis on the impact of relevant social performance indicators from the GRI standard}, series = {Proceedings of the International Annual Conference of the German Operations Research Society 2019 (OR 2019) Dresden, September 3 - 6, 2019}, booktitle = {Proceedings of the International Annual Conference of the German Operations Research Society 2019 (OR 2019) Dresden, September 3 - 6, 2019}, abstract = {The sustainable development of processes is currently an important topic in industry and science. Various interest groups and other factors like resource shortages or a lack of skilled workers drive this trend. In the area of Production and Operation Management, the integration of sustainable aspects is also becoming more and more important. However, mainly ecological aspects are considered. Thus, this contribution expands the previous research by the integration of social aspects. For this, we limit our research to the Master Production Scheduling as part of operational production planning. In the context of sustainability, the Global Reporting Initiative (GRI) Standard has established itself for companies and other organisations to report on their sustainability activities. It is the first and most widely adopted global standards for sustainability reporting. The aim of this standard is to measure the sustainable performance and in this way, sustainability activities can be oriented to specific performance indicators. Accordingly, the GRI standard enables concrete initiatives to improve social, environmental and economic conditions for everyone. The modular standard comprises 36 standard modules. For this paper, the 19 social modules were analysed and relevant indicators that could be influenced by the Master Production Scheduling were identified. One of the important indicators from the GRI standard for our research question is the use of employees, measured in terms of hiring and employee turnover. The long-term employee commitment and thus low fluctuation will become a competitive advantage in the future, which is enhanced by the demographic change and the lack of skilled workers. In order to integrate these aspects based on the GRI standard, the classic formulation of Master Production Scheduling is extended. For this a control of the employee utilization within concrete utilization intervals as well as dependent processing times due to different exhaustion effects were integrated. Additionally, in order to take into account the requirements of a flexible production and to model the use of employees, aspects of personnel requirements planning are considered as well, which enable the build-up and reduction of capacity. As a result, social and economic consequences of related production scenarios are presented. In this context, a conflict of targets arises especially with macroeconomic fluctuations. On the one hand, shortages and inventories should be avoided from an economic point of view. On the other hand, a low and constant work intensity as well as a constant number of staff should be preferred for long-term employee commitment. Accordingly, the ability of the model to examine these questions, which will become more and more important for industrial enterprises in the future, becomes clear. Furthermore, it can be seen that it is possible to improve social aspects by adapted production planning without neglecting economic targets.}, subject = {Produktionsplanung}, language = {en} } @inproceedings{Herrmann, author = {Herrmann, Frank}, title = {Scheduling in case of a Partially Automated Production}, series = {Proceedings of the International Annual Conference of the German Operations Research Society 2016 (OR 2016), Hamburg, 30.8. - 4.9.2016}, booktitle = {Proceedings of the International Annual Conference of the German Operations Research Society 2016 (OR 2016), Hamburg, 30.8. - 4.9.2016}, abstract = {In recent years, a considerable amount of interest has arisen for scheduling problems with technological restrictions. For example, no-buffer flow-shop scheduling problem are well investigated. Here a real world flow shop with a transportation restriction is regarded. It has to produce small batches, very often with a lot size of one, with short response times. Thus, scheduling algorithms are needed to ensure that under the constraint of a high average load of the flow shop, the duedates of the production orders are met. This transportation restriction reduces the set of feasible schedules even more than the nobuffer restrictions discussed in the literature in the case of limited storage. Still this problem is NP-hard. Due to the transportation restriction, the duration of a job A on the flow-shop depends on the other jobs processedon the flow-shop in the same time frame which is called a cycle. Realistic processing times are achieved by a simulation of the scheduling of A which includes the next jobs until A has left the flow-shop. The usage of such realistic processing times instead of net processing times improves the priority rules by around 16\%. There are pools of jobs where a large variance of the cycle times is beneficial and pools of jobs where a small variance is better. This is partially detected by agenetic algorithm. This improves the performance by another 34\%.}, subject = {Produktionsplanung}, language = {en} } @article{HerrmannBuettner, author = {Herrmann, Frank and B{\"u}ttner, Simon}, title = {Automatische Qualit{\"a}tskontrolle mittels Maschinellem Lernen und SAP Leonardo}, series = {Anwendungen und Konzepte der Wirtschaftsinformatik}, journal = {Anwendungen und Konzepte der Wirtschaftsinformatik}, number = {10}, publisher = {AKWI}, issn = {2296-4592}, pages = {46 -- 53}, abstract = {In vielen Unternehmen werden von Menschen durch Ansehen von Produkten Produktionsfehler identifiziert. Die {\"u}bersehenen Produktionsfehler f{\"u}hren zunehmend h{\"a}ufiger zu teuren Kundenreklamationen. F{\"u}r die Produktion von Fußb{\"a}llen wird in dieser Arbeit diese manuelle Qualit{\"a}tssicherung analysiert. Als Alternative werden die Fußb{\"a}lle durch einen Roboter fotografiert u nd durch maschinelles Lernen werden Produktionsfehler auf diesen digitalen Fotos identifiziert. Dieser Pr{\"u}fprozess wird in SAP Leonardo implementiert und damit wird der bereits in einem SAP System implementierte Produktionsprozess (bzw. Unternehmensprozess) erweitert, wodurch ein durchg{\"a}ngig digitalisierter Gesamtprozess implementiert wird. Dadurch werden signifikant bessere Pr{\"u}fergebnisse erreichtb und die Durchlaufzeit des Pr{\"u}fprozesses wird substantiell reduziert.}, language = {de} } @incollection{Herrmann, author = {Herrmann, Frank}, title = {Grundlagen der Optimierung}, series = {Produktionsplanung und -steuerung}, booktitle = {Produktionsplanung und -steuerung}, editor = {Claus, Thorsten and Herrmann, Frank and Manitz, Michael}, publisher = {Springer Gabler}, address = {Berlin, Heidelberg}, isbn = {978-3-662-64290-0}, doi = {10.1007/978-3-658-25168-0_4}, pages = {61 -- 87}, abstract = {Seit vielen Jahrzehnten und in den letzten mit zunehmender Intensit{\"a}t werden Probleme als Optimierungsprobleme dargestellt. Beispiele sind die optimale Nutzungsdauer eines Investitionsobjekts, die Produktionsplanung, die Lagerhaltung bei zuf{\"a}lliger Nachfrage, die Beladung von Lastwagen und die Festlegung von deren (Fahr-) Routen. Dies f{\"u}hrte vor allem in amerikanische Literatur zur {\"o}konomischen Ausbildung zur Verwendung von Optimierungsmodelle zur Erl{\"a}uterung von Sachverhalten - als Beispiel m{\"o}ge das Buch Hillier und Hillier (2011) dienen, welches auch viele Fallstudien aus konkreten industriellen Anwendungen enth{\"a}lt.}, language = {de} } @inproceedings{TrostClausHerrmann, author = {Trost, Marco and Claus, Thorsten and Herrmann, Frank}, title = {Limitation of Temporary Employment in the Master Production Scheduling}, series = {Liberec Economic Forum 2021: Proceedings of the 15th International Conference}, booktitle = {Liberec Economic Forum 2021: Proceedings of the 15th International Conference}, editor = {Antlov{\´a}, Klara and Semer{\´a}dov{\´a}, Tereza}, edition = {1. Aufl.}, address = {Liberec, Czech Republic}, isbn = {978-80-7494-578-6}, pages = {201 -- 209}, language = {en} } @article{Herrmann, author = {Herrmann, Frank}, title = {Human Experience Versus Rule Decision at Krones AG}, series = {Biomedical Journal of Scientific \& Technical Research}, volume = {42}, journal = {Biomedical Journal of Scientific \& Technical Research}, number = {1}, publisher = {Biomedical Research Network+}, issn = {2574 -1241}, doi = {10.26717/BJSTR.2022.42.006691}, pages = {33255 -- 33260}, abstract = {Final assembly at Krones AG must make the best possible use of its production space and meeting the specified customer due dates is critical. Via a self developed simulation tool, the present scheduling procedure is compared with the one by priority rule shortest slack. As a consequence slack should have a higher importance in the planning}, language = {en} } @inproceedings{TerbrackClausGoetzetal., author = {Terbrack, Hajo and Claus, Thorsten and G{\"o}tz, Matthias and Herrmann, Frank and Selmair, Maximilian}, title = {Analyse von konventionellen Priorit{\"a}tsregeln zur Reduktion von CO2-Emissionen durch den Einsatz von Photovoltaikanlagen}, series = {Simulation in Produktion und Logistik 2021: Erlangen, 15.-17. September 2021}, booktitle = {Simulation in Produktion und Logistik 2021: Erlangen, 15.-17. September 2021}, editor = {Franke, J{\"o}rg and Schuderer, Peter}, publisher = {Cuvillier Verlag}, address = {G{\"o}ttingen}, isbn = {978-3736974791}, pages = {75 -- 84}, language = {de} }