@article{KunklerKellner2023, author = {Kunkler, Jan and Kellner, Florian}, title = {Sustainable City Evaluation Using the Database for Estimation of Road Network Performance}, series = {Sustainability}, volume = {15}, journal = {Sustainability}, number = {1}, doi = {10.3390/su15010733}, pages = {733}, year = {2023}, abstract = {This article introduces the Database for Estimation of Road Network Performance (DERNP) to enable wide-scale estimation of relevant Road Network Performance (RNP) factors for major German cities. The methodology behind DERNP is based on a randomized route sampling procedure that utilizes the Worldwide Harmonized Light Vehicles Test Procedure (WLTP) in combination with the tile-based HERE Maps Traffic API v7 and a digital elevation model provided by the European Union's Earth Observation Programme Copernicus to generate a large set of independent and realistic routes throughout OpenStreetMap road networks. By evaluating these routes using the PHEMLight5 framework, a comprehensive list of RNP parameters is estimated and translated into polynomial regression models for general usage. The applicability of these estimations is demonstrated based on a case study of four major German cities. This case study considers network characteristics in terms of detours, infrastructure, traffic congestion, fuel consumption, and CO2 emissions. Our results show that DERNP and its underlying randomized route sampling methodology overcomes major limitations of previous wide-scale RNP approaches, enabling efficient, easy-to-use, and region-specific RNP comparisons.}, language = {en} } @book{KellnerLienlandLukesch2022, author = {Kellner, Florian and Lienland, Bernhard and Lukesch, Maximilian}, title = {Produktionswirtschaft: Planung, Steuerung und Industrie 4.0}, edition = {3}, publisher = {Springer Gabler}, address = {Berlin, Heidelberg}, doi = {10.1007/978-3-662-65803-1}, year = {2022}, abstract = {Dieses Buch bietet eine einsteigerfreundliche Einf{\"u}hrung in die f{\"u}r industrielle Betriebe maßgebliche Aufgabe der Produktionswirtschaft. Im Zentrum steht dabei das operative Produktionsmanagement. Hierzu geh{\"o}ren die erfolgswirksame Bewirtschaftung der Produktionsfaktoren Mensch, Betriebsmittel und Material, der Einsatz von Information sowie die Planung und Steuerung der industriellen Produktion. Mithilfe zahlreicher Unternehmensbeispiele und {\"U}bungsaufgaben wird der Leser durch produktionswirtschaftliche Grundlagen sowie durch Ablauf und Inhalt zentraler Prozesse in der Industrie geleitet. Auch die aktuelle Diskussion um das Thema Industrie 4.0 und cyber-physische Produktionssysteme werden lesefreundlich und mit konkretem Anwendungsbezug pr{\"a}sentiert.}, language = {de} } @article{KraftKellner2022, author = {Kraft, Sarah Katharina and Kellner, Florian}, title = {Can Blockchain Be a Basis to Ensure Transparency in an Agricultural Supply Chain?}, series = {Sustainability}, volume = {14}, journal = {Sustainability}, number = {13}, doi = {10.3390/su14138044}, pages = {8044}, year = {2022}, abstract = {Many supply chains within developing countries lack transparency and are fraught with fraud, corruption, and a substantial number of intermediaries. For several decades, the cocoa sector has faced multiple social, economic, and environmental challenges, some of which include the issue of child labor and very low incomes for farmers, leading to poor living conditions. Blockchain technology has a high potential to reduce—or completely eradicate—some of these hurdles. In this article, we present a blockchain-based solution based on the open-source framework Hyperledger Fabric for the cocoa supply chain to promote transparency and reduce fraud. In doing so, we explicitly describe how farmers can be directly integrated into the whole blockchain solution considering the limited infrastructure, knowledge, and technologies available to them. Since about 70\% of all cocoa worldwide is produced in West Africa, this case study uses the cocoa sector in Ghana as an example.}, language = {en} } @article{Kellner2022, author = {Kellner, Florian}, title = {Generating greenhouse gas cutting incentives when allocating carbon dioxide emissions to shipments in road freight transportation}, series = {OR Spectrum}, volume = {44}, journal = {OR Spectrum}, doi = {10.1007/s00291-022-00675-y}, pages = {833 -- 874}, year = {2022}, abstract = {Road freight transportation accounts for a great share of the anthropogenic greenhouse gas (GHG) emissions. In order to provide a common methodology for carbon accounting related to transport activities, the European Committee for Standardization has published the European Norm EN-16258. Unfortunately, EN-16258 contains gaps and ambiguities and leaves room for interpretation, which makes the comparison of the environmental performance of different logistics networks still difficult and hinders the identification of best practices. This research contributes to the identification of particularly meaningful principles for the allocation of GHG to shipments in road freight transportation by presenting an analytical framework for studying the performance of the EN-16258 allocation schemes with respect to accuracy, fairness, and the GHG minimizing incentive. In doing so, we continue previous studies that analyzed two important aspects of the EN-16258 allocation rules: accuracy and fairness. This study provides further insights into this allocation problem by investigating the incentive power of the different allocation schemes to opt for the GHG minimal way of running a road freight network. First, we complement the list of transport scenarios introduced in prior studies and present two novel scenarios. Second, we carry out a series of numerical experiments to compare the EN-16258 allocation rules with respect to accuracy, fairness, and the GHG minimizing incentive. We find that the results may differ significantly for the two scenarios, suggesting a case-by-case recommendation. This is particularly interesting because the first scenario confirms the results of the prior studies, while the second scenario rather contradicts them.}, language = {en} } @inproceedings{KellnerSchroeder2022, author = {Kellner, Florian and Schr{\"o}der, Nadine}, title = {Location Planning \& Analysis Using Uncertain Data}, series = {2021 International Conference on Decision Aid Sciences and Application (DASA)}, booktitle = {2021 International Conference on Decision Aid Sciences and Application (DASA)}, doi = {10.1109/DASA53625.2021.9682323}, pages = {720 -- 723}, year = {2022}, abstract = {In today's big data era, a humongous amount of data are collected from various sources. In many cases, these data are incomplete, imprecise, and uncertain. An illustrative example is the OpenStreetMap project, where users all over the world contribute data on a more or less precise and complete level. This research shows whether these data are suited to support management decisions. A real-world example demonstrates the extent to which location decisions of a fast-food restaurant chain can be reproduced using techniques from the field of advanced analytics. The problem deals with classifying potential locations and comparing the predicted locations with the actual ones. The data used for this example are retrieved from the OpenStreetMap project. We find that the OpenStreetMap data are generally suitable for predicting location decisions. However, the choice of the data analytics technique is crucial. In our illustrative example case, boosted trees resulted in the best forecast, thereby outperforming neural networks, classic trees, and logit models.}, language = {en} } @article{KellnerLienlandUtz2021, author = {Kellner, Florian and Lienland, Bernhard and Utz, Sebastian}, title = {A multi-criteria decision-making approach for assembling optimal powertrain technology portfolios in low GHG emission environments}, series = {Journal of Industrial Ecology}, volume = {25}, journal = {Journal of Industrial Ecology}, number = {6}, doi = {10.1111/jiec.13148}, pages = {1412 -- 1429}, year = {2021}, abstract = {Environmental regulations force car manufacturers to renew the powertrain technology portfolio offered to the customer to comply with greenhouse gas (GHG) emission targets. In turn, automotive companies face the task of identifying the "right" powertrain technology portfolio consisting of, for example, internal combustion engines and electric vehicles, because the selection of a particular powertrain technology portfolio affects different company targets simultaneously. What makes this decision even more challenging is that future market shares of the different technologies are uncertain. Our research presents a new decision-support approach for assembling optimal powertrain technology portfolios while making decision-makers aware of the trade-offs between the achievable profit, the achievable market share, the market share risk, and the GHG emissions generated by the selected vehicle fleet. The proposed approach combines "a posteriori" decision-making with multi-objective optimization. In an application case, we feed the outlooks of selected market studies into the proposed decision-support system. The result is a visualization and analysis of the current real-world decision-making problem faced by many automotive companies. Our findings indicate that for the proposed GHG restriction at work in 2030 in the European Union, no optimal powertrain technology portfolio with less than 35\% of vehicles equipped with an electric motor exists.}, language = {en} } @article{KunklerBraunKellner2021, author = {Kunkler, Jan and Braun, Maximilian and Kellner, Florian}, title = {Speed Limit Induced CO2 Reduction on Motorways: Enhancing Discussion Transparency through Data Enrichment of Road Networks}, series = {Sustainability}, volume = {13}, journal = {Sustainability}, number = {1}, doi = {10.3390/su13010395}, pages = {395}, year = {2021}, abstract = {Considering climate change, recent political debates often focus on measures to reduce CO2 emissions. One key component is the reduction of emissions produced by motorized vehicles. Since the amount of emission directly correlates to the velocity of a vehicle via energy consumption factors, a general speed limit is often proposed. This article presents a methodology to combine openly available topology data of road networks from OpenStreetMap (OSM) with pay-per-use API traffic data from TomTom to evaluate such measures transparently by analyzing historical real-world circumstances. From our exemplary case study of the German motorway network, we derive that most parts of the motorway network on average do not reach their maximum allowed speed throughout the day due to traffic, construction sites and general road utilization by network participants. Nonetheless our findings prove that the introduction of a speed limit of 120 km per hour on the German autobahn would restrict 50.74\% of network flow kilometers for a CO2 reduction of 7.43\% compared to the unrestricted state.}, language = {en} } @book{LukeschKellner2020, author = {Lukesch, Maximilian and Kellner, Florian}, title = {{\"U}bungsbuch Produktionswirtschaft: Planung, Steuerung und Industrie 4.0}, edition = {2}, publisher = {Springer Gabler}, address = {Berlin, Heidelberg}, doi = {10.1007/978-3-662-62087-8}, year = {2020}, abstract = {Dieses Buch bietet Studierenden mehr als 70 {\"U}bungsaufgaben und drei Fallstudien inklusive ausf{\"u}hrlicher L{\"o}sungen zu ausgew{\"a}hlten Themen der Produktionswirtschaft und Industrie 4.0. Jedes Kapitel enth{\"a}lt eine kurze Einleitung sowie zu erreichende Lernziele. Querverweise auf das Lehrbuch „Produktionswirtschaft" von Kellner/Lienland/Lukesch erleichtern das Selbststudium und erm{\"o}glichen eine optimale Pr{\"u}fungsvorbereitung. In der 2. Auflage wurden umfangreiche {\"U}berarbeitungen hinsichtlich Sprache und Aufbau von Aufgaben, L{\"o}sungswegen und Abbildungen vorgenommen sowie zahlreiche neue Aufgaben erg{\"a}nzt.}, language = {de} } @article{Kellner2021, author = {Kellner, Florian}, title = {Exploring the impact of urbanization on consumer goods distribution networks}, series = {Journal of Asian Business and Economic Studies}, volume = {28}, journal = {Journal of Asian Business and Economic Studies}, number = {2}, doi = {10.1108/JABES-12-2019-0127}, pages = {101 -- 120}, year = {2021}, abstract = {Purpose Due to the growing percentage share of urban dwellers, the physical distribution of products faces altering conditions. This research explores the effects that urbanization has on the performance of a fast-moving consumer goods distribution network. A focus is set on changes in distribution cost, the cost-minimal network design, and greenhouse gas emissions. Design/methodology/approach The analyses are based on a quantitative distribution network model of an existing manufacturer of consumer goods. Findings The results indicate that the foreseen population shift will affect the network's economic and environmental performance. Effects are, among others, due to differences in the efficiency of supplying urban and nonurban regions. The combined effects of urbanization and the development of the population size will even more affect the network's performance. Originality/value Research dealing with distribution logistics and urbanization primarily focuses on city logistics. In this paper, the object of analysis is the entire distribution system.}, language = {en} } @book{KellnerBrabaender2020, author = {Kellner, Florian and Brab{\"a}nder, Christian}, title = {VBA mit Excel}, publisher = {Springer Gabler}, address = {Berlin, Heidelberg}, doi = {10.1007/978-3-662-59740-8}, year = {2020}, abstract = {Dieses Buch bietet eine anwendungsorientierte Einf{\"u}hrung in die Programmierung mit Visual Basic for Applications (VBA) in Microsoft Excel. Es erm{\"o}glicht auch Einsteigern die selbstst{\"a}ndige L{\"o}sung kleiner bis mittelgroßer Programmieraufgaben aus dem betriebswirtschaftlichen Alltag. Der Schwierigkeitsgrad der Inhalte ist {\"u}berwiegend einfach gehalten, sodass Nutzer, die bereits grundlegende T{\"a}tigkeiten in MS Excel beherrschen, sich nach ihren jeweiligen Anforderungen entsprechend fortbilden k{\"o}nnen. Zahlreiche Praxisbeispiele und {\"U}bungen, die auf einem Windows-Betriebssystem entwickelt und getestet wurden, unterst{\"u}tzen das Lernen Schritt f{\"u}r Schritt und zeigen, wie hilfreich VBA durch Automatisierung und Individualisierung in jedem B{\"u}ro sein kann.}, language = {de} } @book{KellnerLienlandLukesch2020, author = {Kellner, Florian and Lienland, Bernhard and Lukesch, Maximilian}, title = {Produktionswirtschaft: Planung, Steuerung und Industrie 4.0}, edition = {2}, publisher = {Springer Gabler}, address = {Berlin, Heidelberg}, doi = {10.1007/978-3-662-61446-4}, year = {2020}, language = {de} } @inproceedings{KellnerLienlandUtz2020, author = {Kellner, Florian and Lienland, Bernhard and Utz, Sebastian}, title = {Optimal engine technology mix in a low carbon economy}, series = {2020 International Conference on Decision Aid Sciences and Application (DASA)}, booktitle = {2020 International Conference on Decision Aid Sciences and Application (DASA)}, doi = {10.1109/DASA51403.2020.9317094}, pages = {95 -- 98}, year = {2020}, abstract = {Environmental regulations force automotive companies to modify the powertrain technology portfolio offered to the customer to comply with greenhouse gas (GHG) emission targets. Automotive companies, in turn, are faced with the decision of finding the right powertrain technology portfolio because the selection of a particular technology portfolio affects different company targets at the same time. What makes this decision even more interesting is the fact that future market shares of the different technologies are uncertain. With its numerous objectives, this challenge requires multi-criteria decision-making techniques to identify the optimal powertrain technology portfolio. The objective of this research is to present a new decision support approach for assembling optimal powertrain technology portfolios while making decision-makers aware of the trade-offs between the achievable market share, the market share risk, and the GHG emissions generated by the selected vehicle fleet. The proposed approach combines `a posteriori' decision-making, multi-objective optimization, and the Markowitz portfolio theory. In an application case, the outlooks of selected market studies are fed into the proposed decision support system. The result is a visualization and analysis of the current real-world decision-making problem faced by many automotive companies. Interesting findings of this research include that for the assumed GHG restrictions in place in 2030, there exists no optimal powertrain technology portfolio that is not composed of at least 20\% of electric vehicles.}, language = {en} } @incollection{LukeschKellner2019, author = {Lukesch, Maximilian and Kellner, Florian}, title = {Geoinformationssysteme f{\"u}r Logistikmanager: Eine praxisorientierte Einf{\"u}hrung am Beispiel der Freeware QGIS}, series = {Praxishandbuch Logistik: Erfolgreiche Logistik in Industrie, Handel und Dienstleistungsunternehmen}, booktitle = {Praxishandbuch Logistik: Erfolgreiche Logistik in Industrie, Handel und Dienstleistungsunternehmen}, publisher = {Fachverlag Deutscher Wirtschaftsdienst}, address = {K{\"o}ln}, isbn = {978-3-87156-340-9}, year = {2019}, language = {de} } @article{KellnerLienlandUtz2019, author = {Kellner, Florian and Lienland, Bernhard and Utz, Sebastian}, title = {An a posteriori decision support methodology for solving the multi-criteria supplier selection problem}, series = {European Journal of Operational Research}, volume = {272}, journal = {European Journal of Operational Research}, number = {2}, doi = {10.1016/j.ejor.2018.06.044}, pages = {505 -- 522}, year = {2019}, abstract = {This research presents a novel, state-of-the-art methodology for solving a multi-criteria supplier selection problem considering risk and sustainability. It combines multi-objective optimization with the analytic network process to take into account sustainability requirements of a supplier portfolio configuration. To integrate 'risk' into the supplier selection problem, we develop a multi-objective optimization model based on the investment portfolio theory introduced by Markowitz. The proposed model is a non-standard portfolio selection problem with four objectives: (1) minimizing the purchasing costs, (2) selecting the supplier portfolio with the highest logistics service, (3) minimizing the supply risk, and (4) ordering as much as possible from those suppliers with outstanding sustainability performance. The optimization model, which has three linear and one quadratic objective function, is solved by an algorithm that analytically computes a set of efficient solutions and provides graphical decision support through a visualization of the complete and exactly-computed Pareto front (a posteriori approach). The possibility of computing all Pareto-optimal supplier portfolios is beneficial for decision makers as they can compare all optimal solutions at once, identify the trade-offs between the criteria, and study how the different objectives of supplier portfolio configuration may be balanced to finally choose the composition that satisfies the purchasing company's strategy best. The approach has been applied to a real-world supplier portfolio configuration case to demonstrate its applicability and to analyze how the consideration of sustainability requirements may affect the traditional supplier selection and purchasing goals in a real-life setting.}, language = {en} } @article{KellnerSchneiderbauer2019, author = {Kellner, Florian and Schneiderbauer, Miriam}, title = {Further insights into the allocation of greenhouse gas emissions to shipments in road freight transportation: the pollution routing game}, series = {European Journal of Operational Research}, volume = {278}, journal = {European Journal of Operational Research}, number = {1}, doi = {10.1016/j.ejor.2019.04.007}, pages = {296 -- 313}, year = {2019}, abstract = {At present, there is no globally accepted standard for the allocation of greenhouse gas (GHG) emissions to shipments in road freight transportation. The only official international standard for emission calculation of transport operations is the European Norm EN-16258. However, even this norm still allows choosing from several alternative emission allocation schemes. This research aims to harmonize the process of GHG declarations for supply chains by identifying among all allocation units specified by EN-16258 the one that describes a shipment's contribution to GHG emissions best. For this purpose, concepts of the cooperative game theory are used. First, we develop three transport scenarios that allow studying a shipment's effect on GHG: a vehicle routing problem, a network flow model, and a mixed scenario. Our approach extends previous research projects because we take into account that shipment characteristics in terms of origin, destination, weight, and volume consume transport capacities to different degrees, impact the routing of the commercial vehicles and, thus, determine GHG. Second, we present the results of a computational study that bases on the introduced transport scenarios and that compares the allocation vectors resulting from the EN-16258 allocation rules with the Shapley value, which serves as a benchmark for a shipment's contribution to GHG. Furthermore, we show how often the EN-16258 allocation principles are in line with a set of game theoretical fairness criteria. The results indicate that the allocation unit 'distance' is the closest to the game theory benchmark and most often in line with game theoretical fairness criteria.}, language = {en} } @misc{KellnerLukesch2018, author = {Kellner, Florian and Lukesch, Maximilian}, title = {Business Analytics and Big Data: Production, Logistics and Supply Chain Management}, year = {2018}, language = {en} } @book{LukeschKellner2018, author = {Lukesch, Maximilian and Kellner, Florian}, title = {{\"U}bungsbuch Produktionswirtschaft}, publisher = {Springer Gabler}, address = {Berlin, Heidelberg}, doi = {10.1007/978-3-662-57689-2}, year = {2018}, language = {de} } @incollection{OttoLukeschBrabaenderetal.2018, author = {Otto, Andreas and Lukesch, Maximilian and Brab{\"a}nder, Christian and Kellner, Florian}, title = {Konsumg{\"u}terdistribution}, series = {Handbuch Produktions- und Logistikmanagement in Wertsch{\"o}pfungsnetzwerken}, booktitle = {Handbuch Produktions- und Logistikmanagement in Wertsch{\"o}pfungsnetzwerken}, editor = {Corsten, Hans and G{\"o}ssinger, Ralf and Spengler, Thomas S.}, publisher = {De Gruyter Oldenbourg}, address = {Berlin, Boston}, doi = {10.1515/9783110473803-039}, pages = {737 -- 758}, year = {2018}, abstract = {Der Beitrag untersucht die Konsumg{\"u}terdistribution aus systemtheoretischer Sicht.Der Fokus liegt auf der logistischen Funktion der Warenverteilung mit Einschr{\"a}nkung auf schnelldrehende Konsumg{\"u}ter (FMCG) in Deutschland. Der eng an die Empirie angelehnten Beschreibung der Funktion, der Strukturelemente (Kunden, Hersteller, Handel, Logistikdienstleister, Sortimente, Sendungen, Betriebsmittel) sowie der Prozesse (Netzplanung, Distributionsplanung, Auftragsabwicklung, Transporte) folgt die Diskussion prinzipieller Arbeitsfelder (Systemf{\"u}hrerschaft, B{\"u}ndelung, Beschleunigung, Segmentierung, Kanalintegration, Kooperation) zur Umgestaltung der Konsumg{\"u}terdistribution.}, language = {de} } @book{KellnerLienlandLukesch2018, author = {Kellner, Florian and Lienland, Bernhard and Lukesch, Maximilian}, title = {Produktionswirtschaft: Planung, Steuerung und Industrie 4.0}, publisher = {Springer Gabler}, address = {Berlin, Heidelberg}, doi = {10.1007/978-3-662-54341-2}, year = {2018}, language = {de} } @misc{LukeschKellner2016, author = {Lukesch, Maximilian and Kellner, Florian}, title = {Der kleine Leistungsersteller: Ein {\"U}bungsheft}, year = {2016}, language = {de} } @article{LukeschKellner2016, author = {Lukesch, Maximilian and Kellner, Florian}, title = {Green Controlling in Logistiknetzwerken}, series = {Controlling - Zeitschrift f{\"u}r erfolgsorientierte Unternehmensteuerung}, volume = {28}, journal = {Controlling - Zeitschrift f{\"u}r erfolgsorientierte Unternehmensteuerung}, number = {8-9}, pages = {526 -- 529}, year = {2016}, language = {de} } @article{ZengKellnerLienland2016, author = {Zeng, Li and Kellner, Florian and Lienland, Bernhard}, title = {Rucksackprobleme in der Praxis - schnelle Entscheidungen schwer gemacht}, series = {HMD - Praxis der Wirtschaftsinformatik}, volume = {53}, journal = {HMD - Praxis der Wirtschaftsinformatik}, number = {3}, doi = {10.1365/s40702-016-0207-z}, pages = {310 -- 322}, year = {2016}, abstract = {Unternehmen sind h{\"a}ufig mit Situationen konfrontiert, in denen schnell Entscheidungen bez{\"u}glich der Auswahl mehrerer Handlungsalternativen gefunden werden m{\"u}ssen. Mathematische Verfahren k{\"o}nnen hierbei unterst{\"u}tzen, z. B. f{\"u}r die Ermittlung einer ersten Diskussionsbasis. Verf{\"u}gbare Softwarel{\"o}sungen errechnen zwar h{\"a}ufig optimale Ergebnisse, zeigen jedoch Schw{\"a}chen bei der praktischen Anwendbarkeit. So ist eine Einarbeitung in komplexe Optimierungssoftware f{\"u}r die teilweise sporadisch auftretenden Probleme in der Regel f{\"u}r Unternehmen nicht m{\"o}glich, unter anderem auch unter Anbetracht der teilweise hohen Kosten der Standardsoftware und dem ben{\"o}tigten hohen Einarbeitungsaufwand. Gerade Problemstellungen in Fachbereichen, die nicht auf mathematische Probleml{\"o}sung spezialisiert sind, m{\"u}nden daher regelm{\"a}ßig in Ineffizienzen. Basierend auf den in der Literatur diskutierten L{\"o}sungsans{\"a}tzen wurde ein praxisorientierter Ansatz zur Entscheidungsunterst{\"u}tzung f{\"u}r Rucksackprobleme bzw. 0-1 Probleme mithilfe von Genetischen Algorithmen (GA) entwickelt und technisch in Microsoft Excel® umgesetzt. Ein Praxistest bei einem chinesischen Textilunternehmen belegt erh{\"o}hte Effektivit{\"a}t und Effizienz. Die Software kann kostenfrei nach MIT Lizenz unter http://www.solvega.de/ heruntergeladen werden.}, language = {de} } @phdthesis{Kellner2016, author = {Kellner, Florian}, title = {Distribution Network Analysis for Fast Moving Consumer Goods}, year = {2016}, abstract = {This dissertation summarizes three reserach contributions that have been published in academic journals. The reserach analyzes economic and environmental sensitivites of Fast Moving Consumer Goods distribution networks.}, language = {en} } @article{Kellner2016, author = {Kellner, Florian}, title = {Allocating greenhouse gas emissions to shipments in road freight transportation: Suggestions for a global carbon accounting standard}, series = {Energy Policy}, volume = {98}, journal = {Energy Policy}, doi = {10.1016/j.enpol.2016.09.030}, pages = {565 -- 575}, year = {2016}, abstract = {The European Norm EN 16258 was published in 2012 to provide a common methodology for the calculation and declaration of energy consumption and greenhouse gas emissions related to any transport operation. The objective was to offer a pragmatic and scientifically-acceptable approach that allows a wide group of users to prepare standardized, accurate, credible, comparable, and verifiable energy consumption and emission declarations. However, in its current form, EN 16258 contains gaps and ambiguities, and leaves room for interpretation, which makes comparisons of supply chains difficult. This research aims to overcome the shortcomings in the domain of allocating emissions from road freight transport operations to single shipments. Based on a discussion of emission drivers and the results of numerical experiments comparing the allocation vectors created by the EN 16258 allocation rules with those generated by the Shapley value, which is claimed to be the benchmark, 'distance' is identified as the single most useful unit for bridging the trade-off between accuracy and simplicity better than the other recommended allocation schemes. Thus, this paper claims that future versions of EN 16258 should only allow the allocation unit 'distance.' This will promote the accurateness, simplicity, consistency, transparency, and comparability of emission declarations.}, language = {en} } @article{Kellner2016, author = {Kellner, Florian}, title = {Analyse logistischer Systeme mittels Online-Navigationsdiensten ? Bessere Planung auf Grundlage besserer Daten}, series = {HMD - Praxis der Wirtschaftsinformatik}, volume = {53}, journal = {HMD - Praxis der Wirtschaftsinformatik}, doi = {10.1365/s40702-016-0245-6}, pages = {894 -- 905}, year = {2016}, abstract = {Online-Navigationsdienste erm{\"o}glichen die Planung einer Reise von einem Start- zu einem Ziel-Ort. Die Berechnung von Reisedauer und Streckenl{\"a}nge erfolgt auf Grundlage eines detaillierten Straßennetzes und unter Ber{\"u}cksichtigung Orts- und Zeit-typischer Verkehrsaufkommen. Dieser Beitrag zeigt, inwiefern Online-Navigationsdienste die Planung und Analyse logistischer Systeme unterst{\"u}tzen k{\"o}nnen. Er thematisiert insbesondere die Qualit{\"a}t der zur Verf{\"u}gung gestellten Verkehrsinfrastrukturdaten und hebt die komparativen Vorteile des Einsatzes von Online-Navigationsdiensten im Vergleich zu ‚herk{\"o}mmlichen' Verkehrsinformationsquellen hervor. Ein Anwendungsfall, bei dem die durch Transportaktivit{\"a}ten verursachten CO2-Emissionen eines G{\"u}ternahverkehrsnetzes untersucht werden, verdeutlicht die gewonnenen Erkenntnisse.}, language = {de} } @article{Kellner2016, author = {Kellner, Florian}, title = {Exploring the impact of traffic congestion on CO2 emissions in freight distribution networks}, series = {Logistics Research}, volume = {9}, journal = {Logistics Research}, number = {1}, doi = {10.1007/s12159-016-0148-5}, pages = {21}, year = {2016}, abstract = {This research quantifies the impact that regular road traffic congestion has on the CO2 emissions of a real-world distribution network, and it studies the consequences when the number of distribution centers changes. For this purpose, this study makes use of a network model allowing for a detailed representation of all relevant transport operations, including production flows between factories and distribution centers, line haul shipments between distribution centers and customers, and round/delivery trips between transshipment points and retailer locations for the last mile. The processed trip and traffic information does not rely on standard traffic data collection approaches, such as interviews, in situ technologies, or floating car data, but the road traffic data are retrieved from an online navigation service, such as Bing Maps, Google Maps, Inrix, Here, and TomTom. This study proves that online navigation services may considerably contribute to future research projects analyzing CO2 sensitivities and greenhouse gas cutting opportunities in logistics networks.}, language = {en} } @article{Kellner2015, author = {Kellner, Florian}, title = {Insights into the effect of traffic congestion on distribution network characteristics ? a numerical analysis based on navigation service data}, series = {International Journal of Logistics Research and Applications}, volume = {19}, journal = {International Journal of Logistics Research and Applications}, number = {5}, doi = {10.1080/13675567.2015.1094043}, pages = {395 -- 423}, year = {2015}, abstract = {This research studies effects that the average increase in travel times due to road traffic congestion has on characteristics of an existing distribution network. It presents the most detailed estimate of 'on-the-road' effects on distribution network characteristics up to now, from the network modelling perspective and from the processed data point of view. A concrete network model allowing for the representation of all relevant transportation flows is presented. The processed traffic information relies on navigation service data. The use of such data allows the requirements that arise for the traffic analysis of a whole distribution network to be met. It is shown that this data source may considerably contribute in forthcoming research. The effects of traffic congestion are quantified to get insights into the extent to which regular traffic congestion affects distribution network characteristics and to understand the mitigating effect when the number of distribution centres is increased.}, language = {en} } @inproceedings{Kellner2015, author = {Kellner, Florian}, title = {Analysing the greenhouse gas sensitivity of distribution networks}, series = {Global Cleaner Production and Sustainable Consumption Conference}, booktitle = {Global Cleaner Production and Sustainable Consumption Conference}, year = {2015}, language = {en} } @article{KellnerIgl2015, author = {Kellner, Florian and Igl, Johannes}, title = {Greenhouse gas reduction in transport: analyzing the carbon dioxide performance of different freight forwarder networks}, series = {Journal of Cleaner Production}, volume = {99}, journal = {Journal of Cleaner Production}, doi = {10.1016/j.jclepro.2015.03.026}, pages = {177 -- 191}, year = {2015}, abstract = {There are growing concerns in the food industry about how supply chains can be managed in a more sustainable way. When distribution activities are outsourced to a logistics service provider (LSP), shippers need to evaluate the LSPs they may (potentially) engage in order to ensure that supply chain sustainability goals are met. In this paper, we present a methodology for LSP evaluation and focus on the ecological dimension of sustainability. We examine how the network carbon footprint of a real-world distribution system is affected by the LSP network that is chosen to forward goods from production facilities to customers. To do this, we analyze the shipment data of an existing Fast Moving Consumer Goods (FMCG) manufacturer. A quantitative distribution network model is set up to study the network carbon footprint of 125 scenarios. Real-world shipments are forwarded via five generic, idealized types of LSP networks. In total, 625 network carbon footprints, specified by three distribution logistics variables and the structure of the LSP network, have been calculated. The results show that LSP structures practicing a geographically decentralized consolidation of shipments are most efficient in reducing of greenhouse gas (GHG) emissions. Furthermore, the effects of changing the manufacturer's and the LSP's strategies for deciding on the tonnage to be forwarded via the LSP network or moved by direct transports are quantified. Finally, we estimate the GHG effect of improving the capacity utilization of the vehicles that move the products.}, language = {en} } @article{KellnerSchroeder2018, author = {Kellner, Florian and Schr{\"o}der, Nadine}, title = {Data Mining mit unsicheren Daten - Fallbeispiel OpenStreetMap}, series = {HMD - Praxis der Wirtschaftsinformatik}, volume = {55}, journal = {HMD - Praxis der Wirtschaftsinformatik}, number = {3}, doi = {10.1365/s40702-018-0419-5}, pages = {601 -- 613}, year = {2018}, abstract = {Im Zeitalter von Big Data werden immense Informationsbest{\"a}nde aus unterschiedlichen Quellen gesammelt. Die Daten sind h{\"a}ufig unvollst{\"a}ndig, unsicher und ungenau. Ein Beispiel hierf{\"u}r ist das OpenStreetMap Projekt, bei dem Nutzer auf der ganzen Welt einmal mehr und einmal weniger „sauber" bzw. vollst{\"a}ndig Daten beisteuern. In diesem Beitrag wird gezeigt, ob sich diese Daten eignen um ein betriebswirtschaftliches Problem zu l{\"o}sen. Ein konkretes Fallbeispiel verdeutlicht, wie gut Standortentscheidungen einer Fast Food Kette unter Anwendung fortgeschrittener datenanalytischer Verfahren, wie bspw. K{\"u}nstlicher Neuronaler Netze, Entscheidungsb{\"a}ume und Logit-Modelle, nachempfunden werden k{\"o}nnen. Als Grundlage dienen die Daten des OpenStreetMap Projekts. Im Konkreten geht es darum, potenzielle Filialstandorte hinsichtlich deren G{\"u}te mittels OpenStreetMap Daten zu klassifizieren und die prognostizierten Lokationen mit tats{\"a}chlichen Standortentscheidungen zu vergleichen. Dabei zeigt sich, dass die Daten des OpenStreetMap Projekts grunds{\"a}tzlich f{\"u}r die Prognose von Standorten geeignet sind. Allerdings ist die Wahl des datenanalytischen Verfahrens von Bedeutung. Im vorliegenden Fall konnte mit Hilfe der K{\"u}nstlichen Neuronalen Netze das beste Prognoseergebnis erzielt werden.}, language = {de} } @article{FuchsBeckLienlandetal.2018, author = {Fuchs, Christoph and Beck, Daniel and Lienland, Bernhard and Kellner, Florian}, title = {The role of IT in automotive supplier supply chains}, series = {Journal of Enterprise Information Management}, volume = {31}, journal = {Journal of Enterprise Information Management}, number = {1}, doi = {10.1108/JEIM-03-2017-0038}, pages = {64 -- 88}, year = {2018}, abstract = {Purpose The purpose of this paper is to explore the impact of information technology (IT) on supply chain performance in the automotive industry. Prior studies that analyzed the impact of IT on supply chain performance report results representing the situation of the "average industry." This research focuses on the automotive industry because of its major importance in many national economies and due to the fact that automotive supply chains do not represent the supply chain of the average industry. Design/methodology/approach A research model is proposed to examine the relationships between IT capabilities, supply chain capabilities, and supplier performance. The model divides IT capabilities into functional and data capabilities, and supply chain capabilities into internal process excellence and information sharing. Data have been collected from 343 automotive first-tier suppliers. Structural equation modeling with partial least squares is used to analyze the data. Findings The results suggest that functional capabilities have the greatest impact on internal process excellence, which in turn enhances supplier performance. However, frequent and adequate information sharing also contributes significantly to supplier performance. Data capabilities enable supply chain capabilities through their positive impact on functional capabilities. Practical implications The findings will help managers to understand the effect of IT implementation on company performance and to decide whether to invest in the expansion of IT capacities. Originality/value This research reports the impact of IT on supply chain performance in one of the most important industries in many industrialized countries, and it provides a new perspective on evaluating the contribution of IT on firm performance.}, language = {en} } @article{KellnerChristinaGoerkLienland2017, author = {Kellner, Florian and Christina Goerk, Anna and Lienland, Bernhard}, title = {Mit CO₂-Kennzahlen die {\"O}kobilanz verbessern}, series = {Controlling \& Management Review}, volume = {61}, journal = {Controlling \& Management Review}, number = {9}, doi = {10.1007/s12176-017-0118-z}, pages = {58 -- 64}, year = {2017}, language = {de} } @inproceedings{Kellner2017, author = {Kellner, Florian}, title = {Visual decision support for the multi-objective supplier selection problem}, series = {International Conference on Multiple Objective Programming and Goal Programming (MOPGP)}, booktitle = {International Conference on Multiple Objective Programming and Goal Programming (MOPGP)}, year = {2017}, language = {en} } @inproceedings{Kellner2017, author = {Kellner, Florian}, title = {Multi-objective supplier portfolio configuration under supply risk and sustainability considerations}, series = {International Conference on Operations Research (OR2017)}, booktitle = {International Conference on Operations Research (OR2017)}, year = {2017}, language = {en} } @article{IglKellner2017, author = {Igl, Johannes and Kellner, Florian}, title = {Exploring greenhouse gas reduction opportunities for retailers in Fast Moving Consumer Goods distribution networks}, series = {Transportation Research Part D: Transport and Environment}, volume = {50}, journal = {Transportation Research Part D: Transport and Environment}, doi = {10.1016/j.trd.2016.10.008}, pages = {55 -- 69}, year = {2017}, abstract = {This research explores logistics-related leverages in the responsibility of retailers for improving the environmental performance of a Fast Moving Consumer Goods (FMCG) distribution network. We examine opportunities for modifying the network carbon footprint by changing network design variables. To do so, a quantitative distribution network model is established, and 150 scenarios are calculated by modifying real-world shipment data from an existing multinational FMCG manufacturer. Four distribution variables are identified for a many-to-many and a hub-and-spoke network structure. Two variables affect the distribution network and two interfere in the shipment structure by manipulating weight and/or the delivery date. This research sheds light on the extent of the changes in greenhouse gas (GHG) emissions of the distribution network that result from modifications in the logistics variables. The greatest effect on the quantity of GHG emissions can be observed when an anticipation horizon for orders is introduced. When shipments are consolidated and delivered only weekly or biweekly from the manufacturer to the retailers, GHG emissions drop significantly. Another opportunity for retailers to cut down GHG emissions is based on the concept of minimum order quantities where shipments to a retailer location are bundled until a certain weight is reached. Additionally, total GHG emissions of distribution may be reduced by raising the tonnage limit, thereby triggering direct shipments between the manufacturer's facilities and the retailer locations, or by raising the tonnage limit, which triggers direct shipments in the logistics service provider network. The extent of GHG reduction is assessed for all investigated variables.}, language = {en} } @inproceedings{Kellner2017, author = {Kellner, Florian}, title = {Supplier portfolio optimization}, series = {Ipsera Conference Hungary 2017}, booktitle = {Ipsera Conference Hungary 2017}, year = {2017}, language = {en} } @incollection{KellnerLukesch2017, author = {Kellner, Florian and Lukesch, Maximilian}, title = {Logistik nachhaltig gestalten: Die Bestimmung von CO2-Emissionen im Straßeng{\"u}tertransport}, series = {Praxishandbuch Logistik: Erfolgreiche Logistik in Industrie, Handel und Dienstleistungsunternehmen}, booktitle = {Praxishandbuch Logistik: Erfolgreiche Logistik in Industrie, Handel und Dienstleistungsunternehmen}, editor = {Pradel, Uwe-H. and S{\"u}ssenguth, Wolfram and Piontek, Jochem and Schwolgin, Armin F.}, publisher = {Fachverlag Deutscher Wirtschaftsdienst}, address = {K{\"o}ln}, year = {2017}, language = {de} } @article{KellnerOttoBrabaender2017, author = {Kellner, Florian and Otto, Andreas and Brab{\"a}nder, Christian}, title = {Bringing infrastructure into pricing in road freight transportation ? A measuring concept based on navigation service data}, series = {Transportation Research Procedia}, volume = {25}, journal = {Transportation Research Procedia}, doi = {10.1016/j.trpro.2017.05.458}, pages = {794 -- 805}, year = {2017}, abstract = {Differences in road infrastructure, such as capacity, congestion, speed limits affect the productivity and the costs of short-distance freight operations. This article introduces a novel methodology that is based on navigation service data to measure the effects in terms of cost per kilometer using navigation and shipment data. The methodology is applied to five terminals of a forwarding cooperation and has been able to document significant differences in cost per kilometer across the terminals. The research results can be used by logistics service providers to better understand how productivity and thus profitability is affected by the quality of the transportation infrastructure in the particular areas they operate in. Furthermore, the insights will help these companies for better, i.e. cost-based pricing and will allow to document why and where prices need to be adapted.}, language = {en} } @article{LienlandZengMayrocketal.2017, author = {Lienland, Bernhard and Zeng, Li and Mayrock, Michael and Kellner, Florian}, title = {Operations Research im Controlling}, series = {Controlling: Zeitschrift f{\"u}r erfolgsorientierte Unternehmenssteuerung}, volume = {29}, journal = {Controlling: Zeitschrift f{\"u}r erfolgsorientierte Unternehmenssteuerung}, number = {2}, doi = {10.15358/0935-0381-2017-2}, pages = {55 -- 57}, year = {2017}, language = {de} } @article{NeumuellerKellnerGuptaetal.2015, author = {Neum{\"u}ller, Claudia and Kellner, Florian and Gupta, Jatinder N. D. and Lasch, Rainer}, title = {Integrating three-dimensional sustainability in distribution centre selection: the process analysis method-based analytic network process}, series = {International Journal of Production Research}, volume = {53}, journal = {International Journal of Production Research}, number = {2}, doi = {10.1080/00207543.2014.939241}, pages = {409 -- 434}, year = {2015}, abstract = {In this paper, we propose a combined methodology for the selection of distribution centres (DCs) by integrating and balancing economic, environmental and social sustainability aspects. The analytic network process (ANP) permits to systematically evaluate possible DCs on the basis of a situation-specific decision structure. A systematic development of the decision networks, which is one of the core challenges using the ANP, is supported by the process analysis method which we extend for that purpose. The validity and soundness of the proposed framework are demonstrated by means of a case study. The case study results reveal that omitting aspects of sustainability can lead to unfortunate results.}, language = {en} } @article{KellnerOttoLienland2014, author = {Kellner, Florian and Otto, Andreas and Lienland, Bernhard}, title = {Cost Assignment Paradox: Indirect Tooling Costs and Production Orders}, series = {Advances in Management Accounting}, volume = {23}, journal = {Advances in Management Accounting}, doi = {10.1108/S1474-787120140000023007}, pages = {211 -- 251}, year = {2014}, abstract = {Purpose Tooling is a common component of an industrial product's manufacture. Specific tooling is devised to serve the fabrication of a particular product, while generic tooling can be used in the manufacture of multiple products. In the latter case, companies are confronted with the problem of fairly allocating the indirect costs of the tooling. This article studies how to allocate costs of generic tooling to single production orders. Methodology Ten allocation methods (AMs) are described that are in principle suited to the distribution of generic tooling costs to production orders. Since the presented methods have for the most part been discussed in differing contexts, we apply them to a specified generic tooling problem for comparison. Evaluation of the various methods is based on 16 criteria. Reasoning is supported by a computational Monte Carlo simulation. Furthermore, we suggest using the Analytical Hierarchy Process (AHP) to elaborate one final proposition concerning the most preferable allocation scheme. Findings The article reports the single allocation rules' performances for different allocation scenarios. The described characteristics refer to fairness, efficiency, and simplicity as well as to empty-core performance. Using AHP analysis allows for the aggregation of the rules' criteria ratings. Thus, especially suitable allocation schemes for the problem at hand are identified. Practical implications An allocation is required for budgeting reasons and also for the definition of projects' bottom-up sales prices. Selecting the "right" AM is important, as a suboptimal AM can result in unfair allocation vectors, which will act as incentives to stop using the common resource, potentially leading to higher total costs. Originality/value of the article Research on the comparison of AMs is typically performed for certain purposes, such as enterprise networks, horizontal cooperative purchasing scenarios, or municipal service units. This article will augment the research evaluating AMs by introducing a novel set of evaluation criteria and by providing an in-depth comparison of AMs suited for the allocation of generic tooling costs.}, language = {en} } @inproceedings{Kellner2013, author = {Kellner, Florian}, title = {GHG network analysis FMCG}, series = {Logistikmanagement 2013}, booktitle = {Logistikmanagement 2013}, year = {2013}, language = {en} } @article{KellnerOttoBusch2012, author = {Kellner, Florian and Otto, Andreas and Busch, Andreas}, title = {Understanding the robustness of optimal FMCG distribution networks}, series = {Logistics Research}, volume = {6}, journal = {Logistics Research}, number = {4}, doi = {10.1007/s12159-012-0097-6}, pages = {173 -- 185}, year = {2012}, abstract = {Distribution network design is about recommending long-term network structures in an environment where logistic variables like transportation costs or retailer order sizes dynamically change over time. The challenge for management is to recommend an optimal network configuration that will allow for longer term optimal results despite of environmental turbulences. This paper studies the robustness of cost-optimized FMCG (fast-moving consumer goods) distribution networks. It aims at observing the impact of changing variables/conditions on optimized logistic structures in terms of the optimal number and geographical locations of existing distribution centers. Five variables have been identified as relevant to the network structure. A case study approach is applied to study the robustness of an existing, typical, and optimized FMCG network. First, distribution network data of a German manufacturer of FMCG are recorded and analyzed. A quantitative model is set up to reflect the actual cost structure. Second, a cost optimal network configuration is determined as a benchmark for further analysis. Third, the variables investigated are altered to represent changes, both isolated (ceteris paribus) and in combination (scenario analysis). Each one of the variables investigated proves to be fundamentally able to suggest a change of the optimal network structure. However, the scenario analysis indicates that the expected changes will by and large compensate each other, leaving the network in near optimal condition over an extended period of time.}, language = {en} } @incollection{KellnerOttoBusch2012, author = {Kellner, Florian and Otto, Andreas and Busch, Andreas}, title = {Distribution Networks - Rigid Investments In Dynamic Environments}, series = {Flexibility and adaptability of global supply chains - Proceedings of the 7th German-Russian Logistics Workshop (DR-LOG 2012)}, booktitle = {Flexibility and adaptability of global supply chains - Proceedings of the 7th German-Russian Logistics Workshop (DR-LOG 2012)}, editor = {Ivanov, Dimitri and Sokolov, Boris and K{\"a}schel, Joachim}, pages = {103 -- 111}, year = {2012}, language = {en} } @article{KellnerIgl2012, author = {Kellner, Florian and Igl, Johannes}, title = {Estimating the effect of changing retailing structures on the greenhouse gas performance of FMCG distribution networks}, series = {Logistics Research}, volume = {4}, journal = {Logistics Research}, number = {3-4}, doi = {10.1007/s12159-012-0063-3}, pages = {87 -- 99}, year = {2012}, abstract = {The assessment of greenhouse gas (GHG) emissions of supply chain activities is performed to create transparency across the supply chain and to identify emission-cutting opportunities. Literature provides several generic and case study approaches to estimate GHG emissions. But research often focuses on products. This paper sheds light on how the greenhouse performance of a fast-moving consumer goods (FMCG) distribution network depends on several (FMCG specific) variables to set up a "CO2 network footprint". Within a quantitative computational study, the distribution network footprint of an existing FMCG manufacturer is analyzed. Three options being fundamentally able to reduce total GHG emissions are identified: number of distribution centers, performance of the engaged logistics service provider and shipment structure. First, transportation processes for the investigated FMCG manufacturer are analyzed to derive GHG emissions caused by different distribution shipments. Second, initial data are manipulated to simulate variable changes, that is, different logistics structures. Third, results are reported and analyzed to show up how different changes in logistics structures may reduce GHG, without technological propulsion or use of regenerative energy.}, language = {en} } @article{KellnerOtto2012, author = {Kellner, Florian and Otto, Andreas}, title = {Allocating CO2 emissions to shipments in road freight transportation}, series = {Journal of Management Control}, volume = {22}, journal = {Journal of Management Control}, number = {4}, doi = {10.1007/s00187-011-0143-6}, pages = {451 -- 479}, year = {2012}, abstract = {Logistic activity, in particular transportation, produces green house gases (GHG). For different purposes GHG need to be allocated to objects. This paper studies how to allocate the GHG volume of a transportation process (delivery tour) to the single shipments moved by the process. First, it identifies classes of generic allocation schemes and presents 15 allocation methods. Second, since the majority of these methods has not been designed for allocating GHG, we apply and compare them in the short distance transport context within a numerical example. The aim is to study how the schemes perform according to criteria. We suggest using causality, efficiency, empty core robustness, symmetry, individual rationality, coalition stability, ease of application, and set robustness as appraisal criteria and attempt to mainstream the discussion by recommending selected allocation methods.}, language = {en} } @article{LienlandKellner2012, author = {Lienland, Bernhard and Kellner, Florian}, title = {Projektauswahl mit der linearen Optimierung im Mittelstand}, series = {HMD - Praxis der Wirtschaftsinformatik}, volume = {49}, journal = {HMD - Praxis der Wirtschaftsinformatik}, number = {3}, doi = {10.1007/BF03340699}, pages = {52 -- 62}, year = {2012}, abstract = {Die Projektauswahl stellt eine Herausforderung insbesondere f{\"u}r mittelst{\"a}ndische Industrieunternehmen dar. Abh{\"a}ngigkeiten verschiedener Alternativen und vorgegebene Investitionsbudgets f{\"u}hren bei Anwendung von in der Praxis standardm{\"a}ßig eingesetzten Verfahren regelm{\"a}ßig zu suboptimalen Projektkombinationen. In enger Abstimmung mit einem Automobilzulieferer wurde ein Ansatz zur Projektauswahl unter Ber{\"u}cksichtigung von Ressourcen und laufenden Projekten entwickelt sowie technisch umgesetzt. Implementierte Praxistests belegen Verbesserungen bei der Projektauswahl, aber auch bei der Budgeteinhaltung, der Fixkostenreduzierung sowie der Angebotspreisbestimmung.}, language = {de} } @article{ObermaierHofmannKellner2010, author = {Obermaier, Robert and Hofmann, Johann and Kellner, Florian}, title = {Webbasierte Fertigungssteuerung in der Praxis. Produktivit{\"a}tssteigerungen mit dem Manufacturing-Execution-System MR-CM©}, series = {HMD - Praxis der Wirtschaftsinformatik}, volume = {47}, journal = {HMD - Praxis der Wirtschaftsinformatik}, number = {2}, doi = {10.1007/BF03340455}, pages = {49 -- 59}, year = {2010}, abstract = {Manufacturing-Execution-Systeme (MES) werden in der Fertigungsindustrie dazu eingesetzt, einen durchgehenden Informationsfluss zwischen den an der Fertigung beteiligten Systemen herzustellen. Von der Vernetzung aller an der Produktion beteiligten Systeme wird dabei eine gesteigerte Produktivit{\"a}t auf Shop-Floor-Ebene erwartet. Beim Durchlauf des beispielhaft gezeigten Fertigungsauftrages wurden durch den Einsatz von MR-CM©, einem von der Maschinen-fabrik Reinhausen entwickelten und implemen-tierten MES, bereits einige Produktivit{\"a}tspotenziale im Vergleich mit der konventionellen Abwicklung ohne Einsatz des MES deutlich. Diese resultieren im Wesentlichen aus der Eliminierung von nicht wertsch{\"o}pfenden Schnittstellenproblemen zwischen den an der Auftragsdurchf{\"u}hrung beteiligten Maschinen. Die erzielten Produktivit{\"a}tszuw{\"a}chse bestehen im Kern aus einer Verk{\"u}rzung der Maschinenr{\"u}stzeiten, was zu einer Reduktion der Produktionskosten und einer Zunahme der Produktionsflexibilit{\"a}t f{\"u}hrt und zu einer Reduzierung der Werkzeugbest{\"a}nde sowie der damit verbundenen Kapitalbindungskosten.}, language = {de} } @inproceedings{Kellner2010, author = {Kellner, Florian}, title = {Changes in the field of FMCG distribution logistics and their impacts on the cost optimal distribution network - A simulation based case study}, series = {15th European Logistics Association Doctorate Workshop}, booktitle = {15th European Logistics Association Doctorate Workshop}, year = {2010}, language = {en} } @article{BraunKunklerKellner2020, author = {Braun, Maximilian and Kunkler, Jan and Kellner, Florian}, title = {Towards Sustainable Cities: Utilizing Floating Car Data to Support Location-Based Road Network Performance Measurements}, series = {Sustainability}, volume = {12}, journal = {Sustainability}, number = {19}, doi = {10.3390/su12198145}, pages = {8145}, year = {2020}, abstract = {Road network performance (RNP) is a key element for urban sustainability as it has a significant impact on economy, environment, and society. Poor RNP can lead to traffic congestion, which can lead to higher transportation costs, more pollution and health issues regarding the urban population. To evaluate the effects of the RNP, the involved stakeholders need a real-world data base to work with. This paper develops a data collection approach to enable location-based RNP analysis using publicly available traffic information. Therefore, we use reachable range requests implemented by navigation service providers to retrieve travel times, travel speeds, and traffic conditions. To demonstrate the practicability of the proposed methodology, a comparison of four German cities is made, considering the network characteristics with respect to detours, infrastructure, and traffic congestion. The results are combined with cost rates to compare the economical dimension of sustainability of the chosen cities. Our results show that digitization eases the assessment of traffic data and that a combination of several indicators must be considered depending on the relevant sustainability dimension decisions are made from.}, language = {en} } @article{KellnerUtz2019, author = {Kellner, Florian and Utz, Sebastian}, title = {Sustainability in supplier selection and order allocation: combining integer variables with Markowitz portfolio theory}, series = {Journal of Cleaner Production}, volume = {214}, journal = {Journal of Cleaner Production}, doi = {10.1016/j.jclepro.2018.12.315}, pages = {462 -- 474}, year = {2019}, abstract = {This research presents a decision support methodology for the multi-criteria supplier selection and order allocation problem. The proposed approach supports purchasing managers in assembling mid-term supplier portfolios while making them aware of the trade-offs between the supplier sustainability, the purchasing costs, and the overall supply risk. First, we propose a multi-objective optimization model with three objectives: to maximize the supplier sustainability, to select the supplier portfolio with the lowest purchasing costs, and to minimize the supply risk. Our model extends existing mathematical approaches that follow the portfolio theory fathered by H. Markowitz by integrating the aspect 'risk' into the supplier selection problem. Secondly, since we allow for integer variables in our model—in contrast to the classical Markowitz portfolio theory—we use the ε-constraint method to visualize the efficient surface. The possibility of considering the non-dominated set of supplier portfolios is advantageous for purchasing managers as they gain a picture of the different optimal supplier portfolios and are able to analyze the trade-offs between the different purchasing goals before making a decision. Finally, we illustrate the applicability of the proposed methodology in a real-world supplier selection and order allocation case from the automotive industry. In the example case, we identify 1754 optimal supplier portfolios that may be assembled based on the eight available suppliers. Our analyses show that each optimal portfolio consists of two suppliers, with one specific supplier being included in each portfolio. Furthermore, four suppliers are not part of any optimal solution.}, language = {en} }