TY - JOUR A1 - Herrmann, Frank T1 - Using Optimization Models for Scheduling in Enterprise Resource Planning Systems JF - Systems N2 - Companies often use specially-designed production systems and change them from time to time. They produce small batches in order to satisfy specific demands with the least tardiness. This imposes high demands on high-performance scheduling algorithms which can be rapidly adapted to changes in the production system. As a solution, this paper proposes a generic approach: solutions were obtained using a widely-used commercially-available tool for solving linear optimization models, which is available in an Enterprise Resource Planning System (in the SAP system for example) or can be connected to it. In a real-world application of a flow shop with special restrictions this approach is successfully used on a standard personal computer. Thus, the main implication is that optimal scheduling with a commercially-available tool, incorporated in an Enterprise Resource Planning System, may be the best approach. KW - Enterprise-Resource-Planning KW - Produktionsplanung KW - Lineare Optimierung KW - Scheduling KW - Optimization model KW - Real world application KW - Enterprise resource planning system KW - Material requirements planning II KW - Priority rules Y1 - 2016 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-2036 VL - 4 IS - 1 ER - TY - JOUR A1 - Rueck, Philip A1 - Herrmann, Frank A1 - Schuierer, Maximilian T1 - Automatisierung von Akzeptanztests im Bereich der Web-Entwicklung JF - Anwendungen und Konzepte der Wirtschaftsinformatik (AKWI) N2 - Jede Art von Software muss heutzutage höchsten Anforderungen genügen. Das Testen von Software bildet demnach einen wesentlichen und zunehmend wichtigeren Teil des Softwareentwicklungszyklus. In Zeiten der Digitalisierung ist in vielen Softwareprojekten mittlerweile eine Form der Testautomatisierung integriert. Testautomatisierung ermöglicht die Überprüfung von Anforderungen in hohen Tempo und reduziert zudem den manuellen Prüfungsaufwand auf ein Minimum. Diese Arbeit untersucht die Möglichkeit einer Automatisierung von Akzeptanztests im Rahmen der Webentwicklung in einem agilen Umfeld. Anhand eines Anwendungsbeispiels wird dargestellt, wie mithilfe der Werkzeuge Cucumber und Selenium ein erster Ansatz zur Testautomatisierung umgesetzt werden kann. KW - Softwaretest KW - Webentwicklung KW - Automatisches Prüfen KW - Agile Softwareentwicklung KW - Testautomatisierung KW - Scrum KW - Akzeptanztest KW - Selenium KW - Cucumber KW - SpecFlow KW - Behavior Driven Development Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-1885 IS - 8 SP - 37 EP - 45 PB - AKWI ER - TY - JOUR A1 - Galardo, Enrico Antonio A1 - Herrmann, Frank A1 - Scheubeck, Fabian T1 - Aufbau eines Templates zur Definition von Layout und Report-Anforderungen an einen internationalen ERP-Rollout BT - am Beispiel eines Shared Service Center Projekts der Krones Gruppe JF - Anwendungen und Konzepte der Wirtschaftsinformatik N2 - Im Rahmen des Asian-Pacific-Shared-Service-(APSS)-Projekts der Krones Gruppe soll der Standort Thailand bis 2020 als ein Shared Service Center (SSC) etabliert werden und zentrale Back-Office Aufgaben für sechs neue Service- und Vertriebsniederlassungen im Raums Asien-Pazifik (APAC) übernehmen. Um das Konzept eines SSCs technisch umzusetzen, sollen voneinander unabhängige ERP-Systeme für jede einzelne der neu gegründeten Niederlassungen implementiert werden. Bisher basierte der Inhalt solcher ERP Rollout-Projekte für Tochtergesellschaften der Krones AG auf keinerlei Standard. Deshalb sollte durch die Schaffung eines softwaregestützten Templates zur Definition von Layout und Report Anforderungen die Implementierung internationaler ERP-Systeme nicht nur vereinfacht werden, sondern ebenfalls ein Standardfragenkatalog zur Abwicklung solcher Projekte innerhalb des Krones Konzerns eingeführt werden. Davon erhoffte man sich eine beschleunigte Implementierung der weiteren ERP-Systeme für das APSS-Projekt. KW - Enterprise-Resource-Planning KW - Dienstleistungszentrum KW - Implementation KW - Shared Service KW - Business One KW - Template KW - ERP Rollout KW - SharePoint Y1 - 2019 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-1907 UR - https://akwi.hswlu.ch/article/view/3235 IS - 9 SP - 1 EP - 11 PB - AKWI ER - TY - JOUR A1 - Schütz, Michael Maximilian A1 - Herrmann, Frank T1 - Aufbau eines Konzeptes zur Erkennung von unterschiedlichen Leistungen von verschiedenen Teilnehmern im Auslieferprozess durch die Analyse des Reklamationsverhaltens JF - Anwendungen und Konzepte der Wirtschaftsinformatik N2 - Im vorliegenden Artikel wird ein Konzept zur Erkennung von Problematiken vorgestellt, welches bei einem führenden Automobilproduzenten umgesetzt wurde. Mit Hilfe dieses Konzeptes, werden Auffälligkeiten anhand der Reklamationsquote bei Standorten, Touren, Händlern und Materialnummern aufgedeckt. Das übergeordnete Ziel, das mit einer effizienten Ursachenanalyse erreicht werden soll, besteht in der langfristigen Senkung der Reklamationsquote. Basis dieses Konzeptes bilden dabei die Reklamationen der einzelnen Händler. Anhand von statistischen Methoden wird eine Grundlage geschaffen, um die Ursachen und Auffälligkeiten der jeweiligen Akteure zu ermitteln. Dabei wird auch die Struktur der Auslieferung näher betrachtet, um Standorte, Touren und Händler zu identifizieren, die bei gleichen Auslieferbedingungen unterschiedliche Werte aufweisen.In den folgenden Ausführungen wird eine Methodik erläutert, die eine Abbildung der „normalen“ Reklamationsquote ermöglicht und gleichzeitig Fahrgebiete, Touren und Händler kennzeichnet, die von dieser Reklamationsquote „auffällig“ abweichen. Des Weiteren wird ein Konzept vorgestellt, welches Materialnummern, die plötzlich häufig reklamiert werden und in diesem Sinn auffällig sind, identifizieren kann. Bei dem Automobilproduzenten wurde durch beide aufgezeigt, wo die Ursachenanalyse am effektivsten anzusetzen ist, um damit eine konstante Senkung der Reklamationsquote und eine Steigerung der Kundenzufriedenheit zu erreichen. KW - Reklamation KW - Distribution KW - Statistik KW - Reklamationsmanagement KW - Distributionsstruktur KW - Ausreißer-Erkennung KW - Analyse-Tool Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-1935 IS - 5 SP - 24 EP - 31 PB - AKWI ER - TY - CHAP A1 - Selmair, Maximilian A1 - Hanfeld, Marc A1 - Claus, Thorsten A1 - Herrmann, Frank T1 - Exploring Opportunities BT - Optimizing Production Planning by Factoring in Energy Procurement and Trading Options T2 - Simulation Notes Europe (SNE), Special Issue: Simulation in Production and Logistics: Impact of Energetic Factors N2 - Motivated by the increasing share of renewable energy in the markets for energy commodities, this study has evaluated the potential for optimizing production planning by taking into account disposable options for procuring energy, in this case electricity. For this purpose, a material flow simulation study extended by an electricity price simulation has been executed to examine possible cost scenarios. Our findings support the notion of a potential for further research in new optimization models involving energy procurement as well as energy trading options KW - Materialflussplanung KW - Energiebedarf KW - Optimierung KW - Simulation Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-2007 VL - 27 IS - 2 SP - 97 EP - 103 ER - TY - GEN A1 - Englberger, Julian A1 - Herrmann, Frank A1 - Claus, Thorsten T1 - A simulation analysis of Independent Requirements Consumption in Master Production Scheduling T2 - ASIM Workshop, Trends in Computational Science and Engineering (ASIM TCSE 2012), February 13-14, 2012, Vienna University of Technology, Austria N2 - This poster presents purpose and function of the Independent Requirements Consumption in Master Production Scheduling and gives recommendations for its application. The approach of hierarchical production planning and its planning problems are explained. The problem of new customer requirements information between planning periods and solving options are shown. The solving option of Independent Requirements Consumption is focus of this poster. The algorithm of the Independent Requirements Consumption that is implemented in commercial Enterprise Resource Planning (ERP) systems like the SAP system is analyzed. The methods for analyzing the effects of the Independent Requirements Consumption are outlined. The scenarios for simulation studies are stated and compared to similar investigations. The simulation studies were performed on a simulation system at IPF that contains both a production planning and control system and a production. The extent of simulation analyses outreaches similar investigations, especially because of the variety of scenarios. For scenarios in which capacity is available to a sufficient extent, advice for setting the Independent Requirements Consumption parameters is given. It is pointed out that with production constrained scenarios, the necessity to level out production leads to problems. An algorithm to determine necessary inventory levels is presented. It is stated that straight advice for Independent Requirements Consumption parameter settings might not be possible with production constrained scenarios. Further analyses with production constrained scenarios as well as investigations concerning safety stocks in combination with Independent Requirements Consumption are current and future research topics at the Innovation Center for Production Logistics and Factory Planning. KW - Produktonsplanung KW - Simulation analysis KW - Independent Requirements Consumption KW - Master Production Scheduling KW - Enterprise-Resource-Planning KW - Kundenorientierung Y1 - 2012 ER - TY - GEN A1 - Terbrack, Hajo A1 - Claus, Thorsten A1 - Herrmann, Frank T1 - An Optimization Model for Production Scheduling with Energy Consumption and Energy-related Emissions T2 - OR 2022, International Conference on Operations Research 2022, September 6-9, 2022, Karlsruhe N2 - Due to the scarcity of resources, rising costs as well as the further need for ecological improvement in industrial production, firms are increasingly motivated to take into account energy consumption in production planning. Associated with this, the consideration of energy-related emissions is becoming an additional point of interest for decisionmakers in both, economic and ecological terms. Based on an extensive systematic literature review, the study at hand presents a multicriterial scheduling problem that addresses tardiness, energy consumption and energy-related emissions in production scheduling. A model is introduced that takes into account job release dates, multiple machine states, a power demand threshold as well as time-varying emission conversion factors. Multiple case studies are analysed and the effects of different technological implementations as energy onsite generation and energy storage systems are evaluated. Furthermore, several price mechanisms regarding energy procurement and emission trading are discussed. Moreover, by coupling the optimization model to a discrete event simulation model, we are able to compare the model results to real case scenarios. First computational experiments have demonstrated that the model and its extensions can effectively reduce the environmental impact associated with production while simultaneously considering corresponding economic objectives. Based on the proposed approach, our research aims on answering the question with which economic trade-offs an ecological improvement in terms of energy consumption and emission output can be achieved in production. KW - Optimization KW - Production Scheduling KW - Energy Consumption Y1 - 2022 ER - TY - GEN A1 - Herrmann, Frank A1 - Dilefeld, Maximilian T1 - Improving the scheduling of AGV and AMR using simulation T2 - OR23, International Conference on Operations Research, August 29 to September 1, 2023, Hamburg N2 - Automated Guided Vehicles (AGV) and intelligent Autonomous Mobile Robots (AMR) are an important tool for designing a flexible Industry 4.0 shopfloor. Both types of Mobile Robots are usually deployed with a Fleet Management software to manage (transport) orders and vehicles together with other superordinate control systems. The planning tasks in the superordinate control system used by both AGVs and AMRs can be divided into Material Flow Management, Job Management, Vehicle Dispatching and Job Processing. Requests for supply and removal of material is issued by the stations and has to be combined to transport jobs. Alternatively, more complex system often user external Material Flow Controllers (e.g. MES). Jobs are collected in a queue and their execution order is determined. Vehicles which can execute the next job have to be identified and the best one is selected. Jobs are split into smaller tasks which are sent to the Mobile Robot and executed. For AGVs navigation functions are mostly integrated into the Fleet Manager as part of the Job Processing, while AMRs perform lower-level navigation functions directly on the vehicle and use the superordinate control system for implementing restrictions and traffic control functions. A need for further research and development was identified especially for decision-making algorithms within the Fleet Management. The goal is to compare existing and develop new strategies to solve the different planning problems. For the individual planning tasks different techniques have been discussed and used in research and practice. However, there is no universal best solution and different options must be compared in the context of the specific use case. KW - Simulation KW - Automated Guided Vehicles KW - Autonomous Mobile Robots Y1 - 2023 ER - TY - GEN A1 - Herrmann, Frank A1 - Schoen, Maximilian A1 - Claus, Thorsten A1 - Dai, Chenghao T1 - Aggregate Production Planning under Risk of Disruption T2 - OR 2024, International Conference on Operations Research 2024, September 3-6, 2024, Munich N2 - In recent years, large scale disruptions to global supply chains, like the Covid pandemic, a ship blocking the Suez canal or sanctions against Russia, have caused production to slow down or even to stand still, causing shortages and massive losses for affected businesses. Even if only specific companies were originally affected, shortages and delays rippled along the supply network. The established approach to deal with disruptions is to utilize safety stock and capacity to compensate for fluctuations in uncertain quantities like customer demand. This approach is tried and tested for small fluctuations. To address larger disruptions, like the above given, very high safety stock and capacity would be needed, which would lead to unnecessarily high costs. Resilience has often been viewed as an expensive capability that drives costs. Recent studies however advocate for the development of lean resilience concepts, creating new capabilities, which enable resilience and can deal with large fluctuations, reimagining resilience from the perspectives of efficiency and value creation. This contribution identifies gaps in current research and establishes structural deficits of approaches discussed in the literature regarding supply chains. Firstly, the need for rigorous, quantitative definitions of resilience and relevant disruptions is justified. Then, a stochastic model for aggregate production planning that includes capabilities to compensate for such large fluctuations along several dimensions is proposed. Lastly, this model is then applied to a case study pertaining to a realistic supply chain under the risk of large scale disruptions and the results of this approach are evaluated. KW - Supply Chain Resiliance KW - Aggregate Production Planning KW - Supply Chain Disruption Y1 - 2024 ER - TY - GEN A1 - Herrmann, Frank ED - Herrmann, Frank ED - Parra, Lorena ED - Popescu, Manuela T1 - Scheduling of a real world filter production with lot-size 1 T2 - SIMUL 2020: The Twelfth International Conference on Advances in System Simulation, 18.-22.10.2020 in Porto, Portugal N2 - In industrial practice, a travelling crane on the ceiling of a factory hall transports products in process from one station to the next one in a production line. Due to space restrictions, there is no buffer between the stations. The production line at Fiedler Andritz, Regensburg in Germany, can be seen as an example of such a problem class. Such restrictions reduce 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. Due to the high number of jobs as well as the goal of a simple algorithm, scheduling is always done by priority rules at the company site. The standard approach of using the net processing time causes poor results. A simulation of the processing time is suggested. In addition, several very relevant priority rules from the literature are modified by this simulated processing and significantly better results are obtained. Keywords-Simulation of processing time; scheduling, flowshop; no-buffer (blocking); no-wait; priority rules; real world application; filter production Y1 - 2020 UR - https://www.iaria.org/conferences2020/filesSIMUL20/SIMUL_58001.pdf UR - https://www.thinkmind.org/index.php?view=instance&instance=SIMUL+2020 SN - 978-1-61208-831-0 SP - 1 EP - 6 PB - IARIA XPS Press CY - Wilmington, DE, USA ER - TY - JOUR A1 - Loshaj, Albion A1 - Herrmann, Frank T1 - Entwicklung einer systemgestützten Stellplatzorganisation für die Werksversandstellen unter Berücksichtigung von variablen Märkten JF - Anwendungen und Konzepte der Wirtschaftsinformatik N2 - Die Gestaltung der Distributionsflächen der Werksversandstellen bei der BMW Group resultiert aus unterschiedlichen und meist werksspezifischen Gegebenheiten. Im Zuge eines Referenzprojektes sollen einheitliche Standards und Vorgehensweisen für die Entwicklung einer Stellplatzorganisation untersucht und festgelegt werden. Im Rahmen dieses Projekts wird analysiert, worauf bei einer Lagergestaltung im Allgemeinen zu achten ist und wie diese Kriterien im Falle der Werksversandstellen im Speziellen umgesetzt werden können. Zusätzlich behandelt dieses Projekt auch die computerunterstützte Betrachtung der Lager- bzw. Stellplatzverwaltung. KW - Distributionslogistik KW - Lagerplanung KW - Stellplatzorganisation KW - Stellplatzverwaltung KW - Stellplatzverwaltungssystem Y1 - 2017 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-1848 IS - 6 SP - 53 EP - 65 PB - AKWI ER - TY - JOUR A1 - Weikmann, Benjamin A1 - Laubmeier, Franz A1 - Herrmann, Frank T1 - Erweiterung des Workflow-Moduls des ERP-Systems FactWork um Möglichkeiten zur Benutzerinteraktion JF - Anwendungen und Konzepte der Wirtschaftsinformatik N2 - Durch Workflow-Systeme computergestützt abgewickelte Geschäftsprozesse benötigen neben den Aktivitäten, die sie komplett automatisiert ausführen können, von Zeit zu Zeit Feedback durch einen oder mehrere Benutzer. Dazu muss es geeignete Formen der Kommunikation und Interaktion der Workflow-Engine mit dem Benutzer geben. Der folgende Artikel beschreibt die Erweiterung des bestehenden Workflow-Moduls eines Enterprise Resource Planning (ERP)-Systems, welches um solche Fähigkeiten ergänzt wird. KW - ERP-Systeme KW - Geschäftsprozesse KW - Workflows KW - UI-Design KW - Betriebliches Informationssystem KW - Mensch-Maschine-Kommunikation KW - Faktor Mensch Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-1858 IS - 7 SP - 19 EP - 31 PB - AKWI ER - TY - JOUR A1 - Herrmann, Frank T1 - The Smart Factory and Its Risks JF - Systems N2 - In this paper, the risks of a Smart Factory are to be examined and structured in order to be able to evaluate the status of the Smart Factory. This thesis thus serves as an overview of the technical components of a Smart Factory and the associated risks. The study takes a holistic view of the smart factory. The results show that the greatest need for action lies in the technological field. Thus, the topics of standardization, information security, availability of IT infrastructure, availability of fast internet and complex systems were prioritized. The organizational and financial risks, which also play an important role in a Smart Factory transformation, are addressed. KW - Smart Factory KW - Datensicherung KW - Infrastruktur KW - Industry 4.0 KW - Smart Factory KW - Risks Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-1793 VL - 6 IS - 4 SP - 1 EP - 15 PB - MDPI ER - TY - JOUR A1 - Herrmann, Frank A1 - Heuberger, Nadine T1 - SAP S/4HANA als Enabler zur Smart Factory der AUDI AG JF - Anwendungen und Konzepte der Wirtschaftsinformatik N2 - Die zunehmende Digitalisierung der Fertigung führt zu einer zunehmenden Vernetzung von Maschinen, Werkstücken, Werkzeugen, Transporteinrichtungen usw. mit dem Ziel einer weitgehenden Selbstorganisation. Dies stellt zwangsläufig Anforderungen an die bisher verwendeten IT-Systemen zur Steuerung von Unternehmen. Enterprise Ressource Planning Systeme (ERP-Systeme) sind wegen ihres Einflusses auf Produktionsprozesse davon besonders betroffen. Zugleich sind sie wegen ihrer umfangreichen Unterstützung von anderen Unternehmensbereichen wie Controlling für Unternehmen sehr relevant. Dies führt bei ERP-System-Herstellern wie der SAP SE zu umfangreichen Erweiterungen. Mit diesem Projekt wird untersucht, in wie weit sich die neue Produktgeneration von SAP SE (SAP S/4HANA) als Enabler zur Smart Factory der AUDI AG eignet. KW - Enterprise-Resource-Planning KW - Digitalisierung KW - Industrie 4.0 KW - Smart Factory KW - Industrie 4.0 KW - SAP HANA KW - SAP S/4HANA KW - Smart Factory Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-1867 IS - 8 SP - 21 EP - 27 PB - AKWI ER - TY - JOUR A1 - Adam, Tilman Josef A1 - Herrmann, Frank A1 - Haberl, Bernhard T1 - Wirtschaftlichkeitsanalyse der bereichsübergreifenden Personalsteuerung und Einführung eines IT-Tools zur Vermeidung von Über-/ Unterkapazitäten JF - Anwendungen und Konzepte der Wirtschaftsinformatik N2 - Dieses Projekt beschäftigt sich mit der bereichsübergreifenden Personalsteuerung in Form von Leihungen und Verleihungen, einem Teilbereich der monatlichen Personalplanung. Durch diese Thematik entstandene Über-/Unterkapazitäten sollen durch die Einführung eines IT-Tools vermieden werden. Leihungen bzw. Verleihungen dienen dem kurzfristigen Ausgleich von Personalüberdeckungen bzw. Personalunterdeckungen. In der Montage des BMW Werks Regensburg wird üblicherweise auch aus anderen Gründen wie beispielsweise der Hilfe bei dem Anlauf eines neuen Modells geliehen. KW - Personalbedarfsermittlung KW - Computerunterstütztes Verfahren Y1 - 2018 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-1876 SN - 2296-4592 IS - 8 SP - 66 EP - 76 PB - AKWI ER - TY - CHAP A1 - Englberger, Julian A1 - Herrmann, Frank A1 - Claus, Thorsten T1 - Simulation-based determination of capacity load factors for master production scheduling T2 - Proceedings of the 15th International Conference on Simulation in Production and Logistics, October 9 - 11, 2013, Paderborn, Germany N2 - This paper deals with the problem of varying capacity load factors in master production scheduling. A simulation system of a production planning and control system and of a production system is described and an approach to compute the capacity loads from the simulation results is developed. This approach is used to measure period-specific capacity load factors for master production scheduling. The measured capacity load factors vary over time and show that the common assumption of the load factors being period-independent is inappropriate. A stochastic programming model to cope with this variation is described. This model is compared to a common linear programming model for master production scheduling in a simulation experiment. The results show that the use of the measured capacity load factor scenarios improves the quality of the estimation of the capacity load factors significantly. KW - PPS KW - Kapazitätsplanung KW - Stochastisches Modell Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-2610 SP - 631 EP - 640 ER - TY - CHAP A1 - Herrmann, Frank A1 - Stumvoll, Ulrike T1 - Überwachung und Verbesserung von Losgrößenmodifikatoren eines PPS-Systems im laufenden Betrieb T2 - Proceedings zur 14. ASIM Fachtagung "Simulation in Produktion und Logistik" vom 6. bis 8. Oktober 2010 am Karlsruher Institut für Technologie, Karlsruhe KW - PPS KW - Losgrößenplanung Y1 - 2010 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-2435 SP - 45 EP - 65 ER - TY - CHAP A1 - Herrmann, Frank A1 - Burgmayr, Georg T1 - Verknüpfung von Softwarelösungen in einem IT-Logistiknetzwerk T2 - Logistische Anwendungen in der Wirtschaftsinformatik. Tagungsband zur AKWI-Fachtagung am 15.9.2010 an der Technische Hochschule Wildau (FH) KW - Logistik KW - Netzwerk KW - Software Y1 - 2010 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-2453 SP - 9 EP - 28 PB - Verlag Vogel Business Media CY - Würzburg ER - TY - CHAP A1 - Herrmann, Frank T1 - Simulation of the control of exponential smoothing by methods used in industrial practice T2 - Proceedings of the 26th EUROPEAN Conference on Modeling and Simulation, May 29th - June 1st, 2012, Koblenz, Germany N2 - Demands of customers for products and of the production for parts are being forecasted quite often in companies. The results are used extensively within the operational production planning and control by IT Systems like the SAP system. Hereby preferably methods based on exponential smoothing are being applied. Especially, in industrial practice it is expected that the pattern of the data change over time in such a way, that the parameters of the exponential smoothing have to be changed. In some companies thousands of items require forecasting, which is very laborious. With an adaptive method the parameters are modified in a controlled manner, as changes in the pattern occur. Two adaptive methods used in industrial practice are explained. Simulation experiments over a huge number of periods show when they should be used. KW - PPS KW - Nachfrage KW - Prognose KW - Exponentielle Glättung KW - forecast of demands in industrial practice KW - Simulation experiment KW - Enterprise Resource Planning (ERP) system KW - Production Planning and Control (PPS) system, KW - Adaptive method KW - Exponential smoothing Y1 - 2012 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-2262 ER - TY - CHAP A1 - Lange, Frederick A1 - Herrmann, Frank A1 - Claus, Thorsten T1 - Simulation based clearing functions for a model of order release planning T2 - Proceedings of the 27th EUROPEAN Conference on Modeling and Simulation, May 27th - 30th, 2013, Ålesund, Norway N2 - In capacitated production systems at high utilization there exists a nonlinear relationship between the orders which are in process and the output. This nonlinear relationship can be described by nonlinear Clearing Functions. We show how a Clearing function will be estimated and integrate it into a model of order releases planning. We compare our model with two inventory management policies under different demand conditions. KW - clearing function KW - linear programming KW - order release planning KW - simulation KW - Auftragsabwicklung KW - Clearing function Y1 - 2013 U6 - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:898-opus4-2205 SP - 741 EP - 747 ER -