TY - JOUR A1 - Janssen, Larissa A1 - Diabat, Ali A1 - Sauer, Jürgen A1 - Herrmann, Frank T1 - A stochastic micro-periodic age-based inventory replenishment policy for perishable goods JF - Transportation Research Part E: Logistics and Transportation N2 - In this paper, we propose a micro-periodic inventory replenishment policy for quickly perishable goods with fixed and known lifetime of items, deterministic lead time, fixed given order cycle, mixed issuing policies (FIFO and LIFO), age-based stock, imperfect items and target customer service level under random demand. The inventory policy is based on time of day (morning, midday, afternoon or evening). The results of our simulation study show that the proposed micro-periodic inventory policy leads to waste reduction of 66% as well as a partial decrease in cost compared to inventory policy with planning on a daily basis. KW - Frischware KW - Bestandsmanagement KW - Bestellmengenplanung KW - Stochastisches Modell KW - Inventory KW - Micro-periodic KW - Perishable goods KW - Stochastic demand KW - Waste reduction KW - Simulation study KW - Simulation Y1 - 2018 U6 - https://doi.org/10.1016/j.tre.2018.08.009 VL - 118 IS - October SP - 445 EP - 465 PB - Elsevier ER - TY - JOUR A1 - Trost, Marco A1 - Teich, Enrico A1 - Claus, Thorsten A1 - Herrmann, Frank T1 - Ein lineares Optimierungsmodell zur Hauptproduktionsprogrammplanung mit Berücksichtigung sozialer Größen JF - uwf UmweltWirtschaftsForum N2 - Aufgrund weniger existenter sozialorientierter Forschungen im Rahmen der Produktionsplanung und -steuerung stellt dieser Beitrag ein lineares Optimierungsmodell für die Hauptproduktionsprogrammplanung vor, welches soziale Kriterien berücksichtigt. Erste Ergebnisse deuten an, dass geringe Kosten nicht durch eine maximierte Mitarbeiterauslastung entstehen sondern durch geringe Kapazitätsschwankungen. KW - Sustainability KW - Social dimension KW - Production planning and control KW - Master production scheduling KW - Linear optimisation KW - Hierarchische Produktionsplanung KW - Fertigungsprogrammplanung KW - Personaleinsatz KW - Lineare Optimierung Y1 - 2017 U6 - https://doi.org/10.1007/s00550-017-0454-7 VL - 25 SP - 71 EP - 80 ER - TY - BOOK A1 - Claus, Thorsten A1 - Herrmann, Frank A1 - Teich, Enrico T1 - Kostensimulation BT - Grundlagen, Forschungsansätze, Anwendungsbeispiele KW - Kostenanalyse KW - Simulation Y1 - 2019 SN - 978-3-658-25167-3 U6 - https://doi.org/10.1007/978-3-658-25168-0 PB - Springer Gabler CY - Wiesbaden ER - TY - CHAP A1 - Trost, Marco A1 - Claus, Thorsten A1 - Teich, Enrico A1 - Selmair, Maximilian A1 - Herrmann, Frank T1 - Social and Ecological Capabilities for a sustainable Hierarchical Production Planning T2 - Proceedings of the 30th EUROPEAN Conference on Modeling and Simulation (ECMS 2016), May 31st - June 3rd, 2016, Regensburg, Germany N2 - Production planning and production control mainly focus on optimising the entire production system of a company. On the basis of hierarchical planning as a suitable method for solving this task, this paper shows - besides the economic dimension taken into account so far - that there are also social and ecological effects which will have to be considered in the process of planning. For this purpose, we would like to indicate here which social and ecological parameters can be or have already been taken into account for master production scheduling, for lot sizing and resource scheduling. As a result, an overview has been created which presents the existing concepts of sustainable production planning and production control as well as the existing deficits regarding the sustainability perspective. KW - Hierarchische Produktionsplanung KW - Soziale Verantwortung KW - Ökologie KW - production planning KW - hierarchical planning KW - social variables KW - ecological variables KW - sustainable hierarchical production planning Y1 - 2016 U6 - https://doi.org/10.7148/2016-0432 ER - TY - CHAP A1 - Janssen, Larissa A1 - Herrmann, Frank A1 - Claus, Thorsten T1 - Beitrag zur Abfallreduktion mittels mathematischer Optimierung und simulationsbasierter Validierung BT - A contribution to the waste reduction by mathematical optimisation and simulation-based validation T2 - Proceedings of the 16th International Conference on Simulation in Production and Logistics, September 23 - 25, 2015, Dortmund, Germany N2 - Perishable goods with a shelf life of 3-5 days require frequent inventory controls in the food retail trade. Maintaining a high service level for these products in stores is difficult due to demand uncertainty. A high service level often leads to a lot of stock in stores. In case it is not sold, it is waste. As an approach towards waste volume reduction, the economic order quantity (EOQ) problem is optimised in combination with the delivery frequency problem on the basis of the microperiods, i.e. morning, midday, afternoon, and evening. The presented model is designed for multiple stores with one regional warehouse. The simulation model measures the waste volume in stores. Experiments show that the combined optimisation of both problems leads to a reduction of total costs and waste volume. KW - Bestandsmanagement KW - Bestellmengenplanung KW - Optimierung KW - Frischware Y1 - 2015 UR - http://www.asim-fachtagung-spl.de/asim2015/papers/Proof_127_Janssen-V2.pdf ER - TY - CHAP A1 - Selmair, Maximilian A1 - Herrmann, Frank A1 - Claus, Thorsten A1 - Teich, Enrico T1 - Potential of Reducing the Total Energy Consumption by Scheduling a Jobshop Production System T2 - Proceedings of the 16th International Conference on Simulation in Production and Logistics, September 23 - 25, 2015, Dortmund, Germany N2 - This research paper has evaluated the potential of reducing energy consumption by scheduling jobshop production systems with machines using standby modes in free times. The initial introduction of the planning issue is followed by a description of the approach to assess the available potential. Subsequently, the research procedure by means of simulation, a detailed discussion of the results and a perspective on future research is given. Moreover, the notion that scheduling influences the energy consumption in jobshop production systems is supported. The presented simulation research also documents that there is no direct correlation between energy consumption and total lead time, although this was presumed usually. Finally, this paper provides a forecast for a possible optimisation model as well as an exemplary model with an energy-optimised schedule plan. KW - Produktionsplanung KW - Reihenfolgeproblem KW - Energieverbrauch Y1 - 2015 SP - 375 EP - 384 ER - TY - CHAP A1 - Selmair, Maximilian A1 - Claus, Thorsten A1 - Trost, Marco A1 - Bley, Andreas A1 - Herrmann, Frank T1 - Job Shop Scheduling with Flexible Energy Prices T2 - Proceedings of the 30th EUROPEAN Conference on Modeling and Simulation, May 31st - June 3rd, 2016, Regensburg, Germany N2 - The rising energy prices – particularly over the last decade – pose a new challenge for the manufacturing industry. Reactions to climate change, such as the advancement of renewable energies, raise the expectation of further price increases and variations. Regarding the manufacturing industry, production planning and controlling can have a significant influence on the in-plant energy consumption. In this paper, we develop a scheduling method as a linear optimization model with the objective to minimize energy costs in a job shop production system. KW - Job Shop Scheduling KW - Flexible Energy Prices KW - Energy Efficient Production Planning KW - Energy Consumption KW - Standby Y1 - 2016 U6 - https://doi.org/10.7148/2016-0488 ER - TY - CHAP A1 - Herrmann, Frank A1 - Lange, Frederick A1 - Manitz, Michael T1 - Order release within hierarchical production planning and control using product specific clearing functions T2 - Proceedings of the International Annual Conference of the German Operations Research Society 2014 (OR 2014), Aachen, September 2 - 5, 2014, Germany KW - Hierarchische Produktionsplanung KW - Auftragsabwicklung KW - clearing functions Y1 - 2014 ER - TY - CHAP A1 - Herrmann, Frank T1 - Schrittweise Verbesserung des Realbetriebs einer Produktionslinie mit simultanem Produktionsfortschritt T2 - Tagungsband zu "Wissenstransfer in der Wirtschaftsinformatik" im Rahmen der MKWI 2016; vom 09. bis 11. März 2016 an der Technischen Universität Ilmenau in Thüringen KW - Produktionslinie KW - Produktionsfortschritt Y1 - 2016 SP - 19 EP - 26 ER - TY - CHAP A1 - Herrmann, Frank A1 - Manitz, Michael T1 - Some remarks to the shape of Clearing Functions T2 - Proceedings of the International Annual Conference of the German Operations Research Society 2015 (OR 2015) Wien, September 1 - 4 KW - clearing functions KW - production planning Y1 - 2015 ER - TY - CHAP A1 - Herrmann, Frank T1 - Observations to Clearing Functions T2 - Proceedings of the 28th EURO Conference on Operations Research, July 12 - 15, 2015, Glasgow, Scotland KW - clearing functions Y1 - 2015 ER - TY - BOOK A1 - Herrmann, Frank T1 - Übungsbuch - Losbildung und Fertigungssteuerung BT - Aufgaben zur operativen Produktionsplanung und -steuerung N2 - Das Aufgabenbuch ergänzt die in Lehrbüchern erläuterten Verfahren der Losbildung und Fertigungssteuerung durch sehr detaillierte und präzise Lösungen. Losbildung und Fertigungssteuerung sind zentrale Kernelemente der operativen Produktionsplanung und -steuerung, insbesondere in kommerziell verfügbaren IT-Systemen. Daher sind diese Verfahren integrale Bestandteile von Veranstaltungen zur Produktion und Logistik, Produktionsplanung und -steuerungsysteme, Supply Chain Management usw. in Bachelor- und Masterstudiengängen an Hochschulen und Universitäten. Zu Beginn einer Lösung wird die verwendete Methodik soweit dargestellt, dass diese mit den in entsprechenden Vorlesungen gelehrten Inhalten ohne weitere Literatur verständlich ist. Einige Themen, wie die Betrachtung von knappen Kapazitäten und von schwankenden Durchlaufzeiten, gehen über den Inhalt von Standardlehrbüchern hinaus und dürften auch für Doktoranden interessant sein. KW - Produktionsplanung KW - Produktionssteuerung KW - PPS KW - Losgröße KW - Operative Planung KW - Aufgabensammlung Y1 - 2018 SN - 978-3-658-21567-5 U6 - https://doi.org/10.1007/978-3-658-21567-5 PB - Springer Fachmedien CY - Wiesbaden ER - TY - BOOK A1 - Herrmann, Frank A1 - Manitz, Michael T1 - Materialbedarfsplanung und Ressourcenbelegungsplanung BT - Durchführung in Produktionsplanungs- und -steuerungssystemen und ihre Analyse KW - Materialbedarf KW - Produktionsplanung KW - Produktionssteuerung KW - PPS Y1 - 2017 SN - 978-3-658-12543-1 U6 - https://doi.org/10.1007/978-3-658-12543-1 PB - Springer Gabler CY - Wiesbaden ER - TY - JOUR A1 - Herrmann, Frank T1 - SIM-R/3: Softwaresystem zur Simulation der Regelung produktionslogistischer Prozesse durch das R/3-System der SAP AG JF - Wirtschaftsinformatik N2 - State of the art in enterprises is the control of business processes by enterprise resource planning systems (ERP systems) such as the R/3 system of SAP AG. A typical task in the implementation phase of ERP systems consists in the choice of an appropriate lot sizing procedure and the setup of its parameters. The existing procedures do not deliver the best results for each business process. So, a business specific setup is required. Unfortunately, there is no knowledge of good parameter settings for typical business processes. Therefore, different parameter settings have to be tested out on real business processes over long periods (e. g. over several years). Of course, such an approach fails due to time restrictions. In addition, the literature argues that an automated software process — contrary to a physical process — is often never called in question or further optimized. An alternative offers a simulation of business processes which is controlled by an ERP system. In the laboratory of information science and production logistics (LIP) at the University of Applied Sciences, Regensburg, a pilot implementation of a system for simulating the control of production processes by the SAP R/3-System (SIM-R/3) was developed. SIM-R/3 allows such a simulation over long periods. KW - Fertigungslogistik KW - Enterprise-Resource-Planning KW - Simulation KW - SAP R/3 KW - eM-Plant KW - Regelung produktionslogistischer Prozesse KW - Planungsverfahren und-parameter in ERP-Systemen Y1 - 2007 U6 - https://doi.org/10.1007/s11576-007-0034-5 VL - 49 IS - 2 SP - 127 EP - 133 ER - TY - CHAP A1 - Herrmann, Frank A1 - Lange, Frederick A1 - Almeder, Christian T1 - Capacity estimation based on clearing functions for the capacitated lot-sizing problem T2 - Proceedings of the 5th International Workshop on Lot-Sizing, August 26th - 29th, 2014, Porto, Portugal N2 - Single-stage capacitated lot-sizing problems (CLSP) are essential for manyplanning tasks in production systems. Due to the hierarchical planning approach, which is widely used in industrial practice and implemented in commercial enterprise resource planning as well as production planning and controlsystems, a subsequent scheduling is necessary to gain executable productionplans. Capacity consumption depends on many factors as, for example, systems workload, machine availability, or yield. Thus, a feasible and optimalsolution of the CLSP may lead to unplanned delays after sequencing and processing the orders on the shop floor. Using a so called clearing function (CF),which represents the relationship between the workload and the output of a production system, this capacity consumption in a CLSP is improved in various ways and tested on a real-world application. KW - Hierarchische Produktionsplanung KW - Kapazitätsplanung KW - Losgröße KW - clearing functions Y1 - 2014 UR - https://www.emse.fr/~absi/IWLS2014/proceedings_IWLS_2014.pdf ER - TY - CHAP A1 - Herrmann, Frank T1 - Genetic algorithm with simulation for scheduling of a flow shop with simultaneously loaded stations T2 - Proceedings of the 28th EUROPEAN Conference on Modeling and Simulation, May 27th - 30th, 2014, Brescia, Italy N2 - 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. Proceedings 28th European Conference on Modelling and Simulation. KW - Ablaufplanung KW - Hierarchische Produktionsplanung KW - Flow-shop-Problem KW - Reihenfolgeproblem KW - Genetischer Algorithmus KW - simulation of restrictions KW - scheduling KW - flow-shop KW - no-buffer (blocking) KW - no-wait KW - genetic algorithm KW - real world application Y1 - 2014 UR - http://www.scs-europe.net/dlib/2014/ecms14papers/simo_ECMS2014_0076.pdf ER - TY - JOUR A1 - Herrmann, Frank T1 - Simulation der Regelung von Unternehmensprozessen durch ein Enterprise Ressource Planning System am Beispiel von SAP R/3 Y1 - 2007 UR - https://www.hs-nordhausen.de/fileadmin/_migrated/content_uploads/FHN_Schriftenreihe_Heft_3_Herrmann_08_06_2007_01.pdf PB - Verlag der Hochschule Nordhausen ER - TY - JOUR A1 - Herrmann, Frank A1 - Tsakpinis, Athanassios A1 - Wiedermann, Wolfgang T1 - Praxisnahe Ausbildung an der FH-Regensburg mit dem Schwerpunkt SAP JF - Krcmar, Helmut; Rautenstrauch, Claus; Wittges, Holger und Schrader; Heino (Hrsg.): Wirtschaftsinformatik-Ausbildung mit SAP®-Software KW - Hochschulstudium KW - Wirtschaftsinformatik KW - Praxisbezug Y1 - 2006 PB - Josef Eul Verlag CY - Lohmar – Köln ER - TY - RPRT A1 - Wohanka, Christian A1 - Helmstreit, Herbert A1 - Herrmann, Frank T1 - Anbindung von Halbleiter Fertigungsautomaten an die SAP NetWeaver Plattform T2 - Forschungsbericht der Hochschule Regensburg KW - Fertigung KW - Automation KW - Halbleiterbauelement KW - SAP NetWeaver Y1 - 2006 SP - 51 EP - 58 PB - Weka Info Verlag CY - Regensburg ER - TY - CHAP A1 - Herrmann, Frank T1 - Simulated Determination and Usage of a Clearing Function for Leadtime Estimation T2 - Proceedings of the 27th EURO Conference on Operations Research, July 13 - 18, 2014, Barcelona, Spain KW - clearing functions KW - lead time estimation Y1 - 2014 ER - TY - RPRT A1 - Herrmann, Frank A1 - Kreutz, Michael T1 - Simulations-System für das R/3-System (SIM-R/3) der SAP AG T2 - Forschungsbericht der Hochschule Regensburg KW - SAP R/3 KW - Simulation Y1 - 2006 SP - 46 EP - 50 PB - Weka Info Verlag CY - Regensburg ER - TY - RPRT A1 - Heindl, Martina A1 - Herrmann, Frank A1 - Juraske, Erich T1 - Simulation von Einlagerstrategien T2 - Forschungsbericht der Hochschule Regensburg KW - Lagerhaltung KW - Raumbedarf KW - Simulation Y1 - 2007 SP - 30 EP - 39 PB - Weka Info Verlag CY - Regensburg ER - TY - JOUR A1 - Herrmann, Frank T1 - Scheduling a flow shop with simultaneously loaded stations: A real world application JF - Journal of Control Science and Engineering N2 - Companies use special designed flow shops, in order to satisfy specific demands. Products need to be transported (from one station to the next station) by a crane and the way of working of this crane excludes the intermediate storage (of a work piece). In addition, the way of working restricts the set of feasible schedules even more than the no-buffer restriction discussed in the literature in the case of limited storage. Since this scheduling problem is integrated in the usual hierarchical planning, the tardiness is minimised. A linear optimisation model is presented to provide a formal description of this NP-hard problem. It is also used to explain the performance of priority rule based heuristic solutions on small test problems. In detail, priority rules as well as a priority rule based branch and bound procedure are analysed; priority rules are regarded, because a priority rule is still the standard procedure for on-line scheduling in industrial practise. Out of successful priority rules in the literature the best one is identified by an extensive simulative investigation. An improved look-ahead is realised by a restricted search over all possible schedules. KW - Fließfertigung KW - Flow-shop-Problem KW - Scheduling KW - Real world flow shop with restrictions KW - No buffer and no wait KW - Minimising tardiness KW - Optimisation model KW - Priority rules KW - Priority rule based branch and bound procedure Y1 - 2015 U6 - https://doi.org/10.17265/2328-2231/2015.03.004 VL - 3 SP - 147 EP - 163 ER - TY - CHAP A1 - Vitzthum, Thorsten A1 - Herrmann, Frank T1 - Evidence of the Relevance of Master Production Scheduling for Hierarchical Production Planning. T2 - Proceedings, 31st European Conference on Modelling and Simulation (ECMS) 2017, 23rd - May 26th, Budapest, Hungary N2 - This paper deals with the significance of master production scheduling for hierarchical production planning. Production planning in a typical manufacturing organization is a sequence of complex decisions which depends on a number of factors, such as number of products, complexity of products, number of production sites, and number of work centres in each production site. The main idea in hierarchical production planning is to break down larger problems into smaller, more manageable sub problems. Starting with aggregate production planning, the benefits of using master production scheduling for material requirements planning will be conveyed. The main benefit of master production scheduling is more detailed planning. The production groups are thereby disaggregated into final products and the production site disaggregated into work centres. In order to plan capacities, resource profiles are used. By working with resource profiles production lead time data are taken into account to provide time-phased projections of the capacity requirements for each work centre (Vollmann et al. 2005). The case study will show that more accurate planning and consideration of production lead time through master production scheduling results in a demand program that can be realized without shortages or delays. KW - Hierarchische Produktionsplanung KW - Fertigungsprogrammplanung Y1 - 2017 SN - 978-0-9932440-4-9 U6 - https://doi.org/10.7148/2017-0475 ER - TY - CHAP A1 - Amann, Matthias A1 - Herrmann, Frank A1 - Lutz, Christian A1 - Meier, Markus ED - Barton, Thomas ED - Erdlenbruch, Burkhard ED - Herrmann, Frank ED - Müller, Christian T1 - Grad der Zerstörung für eine lokale Suche bei einer taktgetriebenen Fließfertigung T2 - Prozesse, Technologien, Anwendungen, Systeme und Management. Angewandte Forschung in der Wirtschaftsinformatik. Tagungsband zur 27. AKWI-Fachtagung vom 07. bis 10.09.2014 an der Oberbayerischen Technischen Hochschule Regensburg N2 - Unternehmen produzieren oftmals viele Varianten für ein kleines Kundensegment und in kleinen Stückzahlen auf sehr teuren Produktionsanlagen. Deren effiziente und effektive Nutzung erfordert eine möglichst gute Planung der Belegung der Stationen mit Aufträgen. Sehr wirkungsvoll bei Fertigungslinien sind lokale Suchverfahren. Sie erzielen ein lokales Optimum. Um ein globales Optimum zu erreichen, wird die Suche von einem anderen Punkt des Suchraums fortgesetzt. Dabei sollte kein willkürlicher Punkt gewählt werden, sondern nur ein Teil des lokalen Optimums zerstört werden. Unterschiedlich starke Zerstörungen werden für eine taktgetriebene Fließfertigung analysiert. KW - Fließvertigung KW - Fertigungsplanung KW - Optimierung Y1 - 2014 UR - http://www.akwi.de/documents/AKWI_Tagungsband2014.pdf SP - 44 EP - 54 PB - Verlag News & Media CY - Berlin ER - TY - CHAP A1 - Lange, Frederick A1 - Herrmann, Frank A1 - Claus, Thorsten T1 - Simulation based capacity estimation for a model of order release planning under the consideration of service levels T2 - Proceedings of the 15th International Conference on Simulation in Production and Logistics, October 9 - 11, 2013, Paderborn, Germany N2 - Clearing Functions describe the nonlinear relationship between the orders which are in process and the output in capacitated productions systems under high utilization. These Clearing Function can be derived analytical by using steady-state queuing models or empirical by using simulation. We show how to estimate a Clearing Function for a single-level multi-product production system by using a simulation model. This non-linear Clearing Function is integrated into a model of order release planning. We extend this model to consider the uncertainty of the demand by using a Beta service level. We compare our model with an inventory management policy under different demand conditions. KW - Clearing function KW - linear programming KW - order release planning KW - simulation Y1 - 2013 UR - http://www.scs-europe.net/conf/ecms2013/ecms2013proceedings.pdf SN - 978-0-9564944-6-7 SP - 741 EP - 747 ER - TY - CHAP A1 - Herrmann, Frank T1 - Simulation based priority rules for scheduling of a flow shop with simultaneously loaded stations T2 - Proceedings of the 27th EUROPEAN Conference on Modeling and Simulation, May 27th - 30th, 2013, Ålesund, Norway N2 - 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. Since this scheduling problem is integrated in the usual hierarchical planning, the tardiness is minimised. This NP-hard problem is solved by priority rules, because of the addressed dynamic environment (and a high number of jobs) at the company site. Due to the technological restrictions the real duration of a job is significantly larger than its net processing time. By a simulation of the processing time many priority rules are improved and some even significantly. With extensive simulations successful priority rules in the literature are analysed. KW - simulation of processing time KW - scheduling KW - flow-shop KW - no-buffer (blocking) KW - no-wait KW - priority rules KW - real world application KW - Hierarchische Produktionsplanung KW - Flow-shop-Problem KW - Reihenfolgeproblem Y1 - 2013 U6 - https://doi.org/10.7148/2013-0775 SP - 775 EP - 781 ER -