@techreport{BruecklEllerHableretal., author = {Br{\"u}ckl, Oliver and Eller, Johannes and Habler, Florian and Sator, Tobias and Sippenauer, Thomas and Strohmayer, Bernhard and Stuber, Johannes}, title = {Zuk{\"u}nftige Bereitstellung von Blindleistung und anderen Maßnahmen f{\"u}r die Netzsicherheit : Endbericht zum Dienstleistungsauftrag}, pages = {210}, abstract = {Der Zweck dieser Studie liegt darin, aufzuzeigen, welche neuen Herausforderungen f{\"u}r den sicheren Netzbetrieb durch den Ausbau der erneuerbaren Energien entstehen und wie diesen zu begegnen ist. Dabei sind praxisnahe Handlungsempfehlungen abzuleiten und Vorschl{\"a}ge f{\"u}r erforderliche Anpassungen zu unterbreiten. Gegenstand der Be-trachtungen sind die - Blindleistung, - Kurzschlussleistung, - Momentanreserve und der - Netzwiederaufbau. Im Fokus dieser Betrachtungen steht allerdings die Bereitstellung der Blindleistung. Konkret soll diese Studie dazu folgende drei Leitfragen beantworten: - Werden die Potenziale der vorhandenen Technologien schon heute kosteneffi-zient genutzt? - L{\"a}sst sich mehr Kosteneffizienz durch eine transparentere und mehr marktge-st{\"u}tzte Beschaffung erzielen? - Welche Anreize w{\"a}ren zu setzen, um die notwendige Mindesterzeugung konven-tioneller Kraftwerke zu reduzieren. Alle drei Leitfragen m{\"u}nden letztlich in der {\"u}bergeordneten Zielsetzung, eine h{\"o}chst-m{\"o}gliche Kosteneffizienz bei der Bereitstellung von SDL zu erlangen.}, language = {de} } @inproceedings{BuchmannSchwaegerl, author = {Buchmann, Thomas and Schw{\"a}gerl, Felix}, title = {Breaking the Boundaries of Meta Models and Preventing Information Loss in Model-Driven Software Product Lines}, series = {Proceedings of the 11th International Conference on Evaluation of Novel Software Approaches to Software Engineering, Vol 1, 2016, Rome, Italy}, booktitle = {Proceedings of the 11th International Conference on Evaluation of Novel Software Approaches to Software Engineering, Vol 1, 2016, Rome, Italy}, publisher = {SCITEPRESS - Science and and Technology Publications}, doi = {10.5220/0005789100730083}, pages = {83}, abstract = {Model-driven software product line engineering is an integrating discipline for which tool support has become available recently. However, existing tools are still immature and have several weaknesses. Among others, limitations in variability, caused by meta model restrictions, and unintended information loss are not addressed. In this paper, we present two conceptual extensions to model-driven product line engineering based on negative variability, being alternative mappings and surrogates. Alternative mappings allow for unconstrained variability, mitigating meta model restrictions by virtually extending the underlying multi-variant domain model. Surrogates prevent unintended information loss during product derivation based on a contextsensitive product analysis, which can be controlled by a declarative OCL-based language. Both extensions have been implemented in FAMILE, a model-driven product line tool that is based on EMF, provides dedicated consistency repair mechanisms, and completely automates application engineering. The added value of alternative mappings and surrogates is demonstrated by a running example.}, language = {en} } @inproceedings{SchwaegerlBuchmannWestfechtel, author = {Schw{\"a}gerl, Felix and Buchmann, Thomas and Westfechtel, Bernhard}, title = {Multi-variant model transformations - a problem statement}, series = {Proceedings of the 11th International Conference on Evaluation of Novel Software Approaches to Software Engineering}, booktitle = {Proceedings of the 11th International Conference on Evaluation of Novel Software Approaches to Software Engineering}, publisher = {SCITEPRESS}, isbn = {978-989-758-189-2}, issn = {2184-4895}, doi = {10.5220/0005878702030209}, pages = {203 -- 209}, abstract = {Model Transformations are a key element of Model-Driven Software Engineering. As soon as variability is involved, transformations become increasingly complicated. The lack of support for variability in model transformations impairs the acceptance of approaches to organized reuse such as software product lines. In this position paper, the general problem of multi-variant model transformations is formulated for MOF-based, XMI-serialized models. A simplistic case study is presented to specify the input and the expected output of such a transformation. Furthermore, requirements for tool support are defined, including a standardized representation of both multi-variant model instances and variability information, as well as an execution specification for multi-variant transformations. A literature review reveals that the problem is weakly identified and often solved using ad-hoc solutions; there exists no tool providing a general solution to the proposed problem statement. The observation s presented here may serve for the future development of standards and tools.}, language = {en} } @misc{Schermer, author = {Schermer, Detleff}, title = {Test set-up and proposed testing procedure for the determination of masonry walls under in-plane shear loadings : Brick and Block Masonry: Trends, Innovations and Challenges}, series = {Proceedings of the 16th International Brick and Block Masonry Conference (IMAC), Padova, Italy, 26-30 June 2016}, journal = {Proceedings of the 16th International Brick and Block Masonry Conference (IMAC), Padova, Italy, 26-30 June 2016}, publisher = {Routledge}, pages = {1883 -- 1888}, language = {en} } @phdthesis{FlorianKellner, author = {Florian Kellner,}, title = {Distribution Network Analysis for Fast Moving Consumer Goods}, publisher = {University of Regensburg}, address = {Regensburg}, isbn = {https://epub.uni-regensburg.de/32823/}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:355-epub-328237}, 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{LukeschKellner, author = {Lukesch, Maximilian and Kellner, Florian}, title = {Green Controlling in Logistiknetzwerken}, series = {Controlling : Zeitschrift f{\"u}r erfolgsorientierte Unternehmenssteuerung}, volume = {28}, journal = {Controlling : Zeitschrift f{\"u}r erfolgsorientierte Unternehmenssteuerung}, number = {8-9}, publisher = {C.H. Beck}, doi = {10.15358/0935-0381-2016-8-9-526}, pages = {526 -- 529}, language = {en} } @article{Kellner, 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}, publisher = {Taylor \& Francis}, doi = {10.1080/13675567.2015.1094043}, pages = {395 -- 423}, 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} } @article{NeumuellerLaschKellner, author = {Neum{\"u}ller, Claudia and Lasch, Rainer and Kellner, Florian}, title = {Integrating sustainability into strategic supplier portfolio selection}, series = {Management decision}, volume = {54}, journal = {Management decision}, number = {1}, publisher = {Emerald}, doi = {10.1108/MD-05-2015-0191}, pages = {194 -- 221}, abstract = {Purpose - The purpose of this paper is to propose a comprehensive methodology and a problem-specific model for the configuration of the optimal strategic supplier portfolio in terms of traditional, performance-related objectives and sustainability targets. Design/methodology/approach - To bridge the research gap, i.e., to align strategic supplier portfolio selection with corporate sustainability targets, a hybrid model of the analytic network process (ANP) and goal programming (GP) is developed. To validate the model, a case example is presented and managerial feedback is collected. Findings - By enabling the integration of sustainability targets into strategic supplier portfolio configuration, the hybrid ANP-GP model contributes to research in the area of sustainable supply chain management. Results indicate that simplifying the model by omitting one or more details may lead to unfortunate actions. Research limitations/implications - The model has been applied using a case example in the automotive industry. To strengthen the findings, it should be examined under other terms as well. Practical implications - Integrating economic, environmental, and social targets into strategic supplier portfolio configuration reduces supply risks and promotes the achievement of the sustainability goals of the purchasing company. Social implications - Strategic supplier selection counts among the decisions that have an impact on the environment and society for several years. Configuring economically rational, environmentally friendly, and socially responsible supplier bases supports worldwide efforts towards sustainable development. Originality/value - Although sustainable supplier selection has gained importance in recent years, this is the first time that a comprehensive model for the determination of the optimal strategic supplier portfolio in terms of performance-related objectives and sustainability targets has been proposed.}, language = {en} } @article{Kellner, 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}, publisher = {Springer Nature}, doi = {10.1007/s12159-016-0148-5}, 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{Kellner, 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}, number = {6}, publisher = {Springer}, address = {Wiesbaden}, doi = {10.1365/s40702-016-0245-6}, pages = {894 -- 905}, 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 = {en} } @article{Kellner, 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}, address = {Elsevier}, doi = {10.1016/j.enpol.2016.09.030}, pages = {565 -- 575}, 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} } @unpublished{KellnerLienlandUtz, author = {Kellner, Florian and Lienland, Bernhard and Utz, Sebastian}, title = {An a Posteriori Multi-Objective Supplier Portfolio Selection Approach Under Risk and Sustainability Considerations}, series = {SSRN Electronic Journal}, journal = {SSRN Electronic Journal}, doi = {10.2139/ssrn.2901390}, pages = {39}, abstract = {This research presents a novel, state-of-the-art methodology for solving the multi-criteria supplier selection problem under risk and sustainability considerations. The approach combines multi-objective optimization with the analytic network process to meet the requirements for supplier portfolio configuration with sustainability considerations. To integrate the aspect 'risk' into the supplier selection problem, this research develops 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: to minimize the purchasing costs, to select the supplier portfolio with the highest logistics service, to minimize the supply risk, and to order 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 which analytically computes a set of efficient solutions and provides graphical decision support by 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 aspects of supplier portfolio configuration may be balanced to finally choose the composition that satisfies the purchasing company's strategy at 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} } @inproceedings{Liebetruth, author = {Liebetruth, Thomas}, title = {Megatrends, recent developments, its impact on logistics processes and possible reactions - a bavarian perspective}, series = {Carpathian Logistics Congress, CLC : November 4th-6th 2015, Priessnitz Spa, Jesenik, Czech Republic, EU : congress proceedings}, booktitle = {Carpathian Logistics Congress, CLC : November 4th-6th 2015, Priessnitz Spa, Jesenik, Czech Republic, EU : congress proceedings}, publisher = {TANGER Ltd.}, address = {Ostrava}, isbn = {978-80-87294-61-1}, issn = {2694-9318}, doi = {10.35096/othr/pub-8045}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-80451}, pages = {10 -- 14}, abstract = {Megatrends have a high impact on logistics processes. Nevertheless some companies are still hesitating to start initiatives to react to it. Therefore this paper gives an overview of the impact of megatrends on logistics processes. It then gives examples of innovative logistical solutions, how companies can react to these trends and even improve processes and thus create a competitive advantage with a special focus on Bavarian political, industrial and academic initiatives.}, language = {en} } @incollection{BuchmannSchwaegerl, author = {Buchmann, Thomas and Schw{\"a}gerl, Felix}, title = {Advancing Negative Variability in Model-Driven Software Product Line Engineering}, series = {Communications in Computer and Information Science}, booktitle = {Communications in Computer and Information Science}, publisher = {Springer International Publishing}, address = {Cham}, isbn = {9783319563893}, issn = {1865-0929}, doi = {10.1007/978-3-319-56390-9_1}, pages = {1 -- 26}, abstract = {Model-driven software product line engineering aims at increasing the productivity of development of variational software. The principle of negative variability is realized by a multi-variant domain model, from which elements not needed for specific product variants are removed. The application of negative variability is impeded by two factors: First, metamodel restrictions lead to limited expressiveness of the multi-variant domain model. Second, unintended information loss may occur during product derivation. In this paper, we present two conceptual extensions to model-driven product line engineering based on negative variability, being alternative mappings and surrogates. Alternative mappings virtually extend the multi-variant domain model. Surrogates repair unintended information loss by context-sensitive analyses. Both extensions have been implemented in FAMILE, a model-driven product line tool that is based on EMF. Alternative mappings are defined in a dedicated mapping model. Surrogate rules may be defined in a declarative domain-specific language and are taken into account during product derivation. The added value of alternative mappings and surrogates is demonstrated by a running example, a UML-based graph library.}, language = {en} } @inproceedings{SpiegelKurapkat, author = {Spiegel, Daniela and Kurapkat, Dietmar}, title = {Die Ambivalenzen herrschaftlichen Residierens zwischen Orient und Okzident}, series = {Wohnen - Reisen - Residieren. Herrschaftliche Repr{\"a}sentation zwischen tempor{\"a}rer Hofhaltung und dauerhafter Residenz in Orient und Okzident}, booktitle = {Wohnen - Reisen - Residieren. Herrschaftliche Repr{\"a}sentation zwischen tempor{\"a}rer Hofhaltung und dauerhafter Residenz in Orient und Okzident}, editor = {Sack, Doroth{\´e}e and Gussone, Martin}, publisher = {Michael Imhof}, address = {Petersberg}, isbn = {9783731900375}, pages = {17 -- 38}, language = {de} } @article{SpillerDegenKronewaldetal., author = {Spiller, Ralf and Degen, Matthias and Kronewald, Elke and Guertler, Katherine}, title = {Media watchblogs as an instrument of media accountability: An international survey}, series = {Journal of Applied Journalism \& Media Studies}, volume = {5}, journal = {Journal of Applied Journalism \& Media Studies}, number = {2}, publisher = {intellect}, issn = {2049-9531}, doi = {10.1386/ajms.5.2.151_1}, pages = {151 -- 176}, abstract = {Media watchdog weblogs can play an important role in media accountability, provided that the bloggers are regularly active and have an appropriate awareness of their role in the media landscape. The following article examines the presence and influence of media watchblogs in selected nations, as well as the operators' standards and perceptions of their roles. In semi-structured qualitative interviews, operators of watchblogs in Germany, Austria, Switzerland and the United Kingdom discussed their perceptions of their role, their ethical guidelines, their financing and any conflicts of interest, and their projections for the future. The interviews reveal that most media watchbloggers do not interpret their role to be a Fifth Estate with a mandate to monitor the mass media. The watchbloggers are reluctant to accept and uphold formal ethical and quality criteria, and limitations on time and money make them unable to guarantee ongoing critical media analysis. For these reasons, media watchblogs are determined to be a weak instrument of media accountability.}, language = {en} } @article{Lienland, author = {Lienland, Bernhard}, title = {The Implementation of a Cash-Flow-Based Mathematical R\&D Project Selection Model}, series = {International Journal of Information Technology Project Management (IJITPM)}, volume = {7}, journal = {International Journal of Information Technology Project Management (IJITPM)}, number = {3}, publisher = {IGI Global}, doi = {10.4018/IJITPM.2016070102}, pages = {22}, abstract = {Customer project selection is a challenge for many industrial companies. An inappropriate project selection approach can lead to constraint violations, high fixed costs, and suboptimal portfolios. To overcome these problems a cash-flow-based linear optimization model was developed in partnership with a tier-1 automotive supplier. Implementation barriers had been verified through a case study conducted at two organizational hierarchies. Results suggest that an application at the operating levels is possible. At higher levels, though, product and firm complexity require major implementation efforts. This article serves theorists as well as practitioners in multiple regards. First, an overview of existing project selection methods and their application in practice is provided. Additionally, the supplier's current appraisal process is depicted. Second, operations research implementation barriers are identified and validated for the adoption of the proposed mathematical project selection approach. Third, a guideline including procedures to overcome experienced difficulties is presented.}, language = {en} } @article{ZengKellnerLienland, 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}, publisher = {Springer}, address = {Wiesbaden}, doi = {10.1365/s40702-016-0207-z}, pages = {310 -- 322}, 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} } @article{Goertler, author = {G{\"o}rtler, Michael}, title = {Politische Bildung in unruhigen Zeiten? Ein Beispiel f{\"u}r eine Theorie-Praxis-Reflexion}, series = {forum erwachsenenbildung}, volume = {49}, journal = {forum erwachsenenbildung}, number = {2}, publisher = {Waxmann}, address = {M{\"u}nster}, issn = {1433-769X}, pages = {48 -- 49}, language = {de} } @book{Goertler, author = {G{\"o}rtler, Michael}, title = {Politische Bildung und Zeit}, publisher = {Springer}, address = {Wiesbaden}, organization = {Springer}, isbn = {3-658-14194-8}, doi = {10.1007/978-3-658-14194-3}, pages = {329 S.}, abstract = {Michael G{\"o}rtler richtet in dieser Untersuchung den Fokus auf die Bedeutung von Zeit f{\"u}r die politische Bildung, da die Zeitlichkeit politischer Bildungsprozesse und demokratischer Politik in der Didaktik der politischen Bildung bisher kaum beachtet wurde. Der Autor verkleinert diese L{\"u}cke, erweitert den Fachdiskurs und gibt praktische Impulse f{\"u}r die politische Bildungsarbeit. Im Mittelpunkt steht die Frage nach dem expliziten wie impliziten Sichtbarwerden der Zeit in Ans{\"a}tzen der Didaktik der politischen Bildung und der Bildungs- und Sozialwissenschaften. Dabei wird auch gepr{\"u}ft, welche didaktischen Herausforderungen in Bezug auf die Ziele, Inhalte und die Gestaltung von Lehr- und Lernprozessen auf der Subjekt- und Objektseite sowie in der Vermittlung zwischen beiden Seiten beachtet werden m{\"u}ssen.}, language = {de} }