@article{JiBorrmannBeetzetal., author = {Ji, Yang and Borrmann, Andr{\´e} and Beetz, Jakob and Obergrießer, Mathias}, title = {Exchange of Parametric Bridge Models Using a Neutral Data Format}, series = {Journal of Computing in Civil Engineering}, volume = {27}, journal = {Journal of Computing in Civil Engineering}, number = {6}, publisher = {American Society of Civil Engineers}, address = {Reston, VA}, doi = {10.1061/(asce)cp.1943-5487.0000286}, pages = {593 -- 606}, abstract = {Parametric modeling is a well-established methodology in the field of mechanical engineering. It allows for the creation of flexible geometric models using parameters for dimensions and makes it possible to define numeric relationships between these parameters by means of mathematical formulas and define geometric-topological constraints between geometric entities. The result is a flexible geometric model that can be steered through the manipulation of its primary parameters. In contrast to explicit geometric models with fixed dimensions, a parametric model can capture the design intent and represent domain knowledge. The use of parametric modeling techniques is particularly beneficial for designing bridges. This is because the geometric design of bridges is mainly determined by external constraints resulting from the size and the layout of both the overlying and the undercrossing carriageway. This reduces the effort required for reworking when changes are made, while simultaneously providing a high degree of reusability for the model in other, similar projects, resulting in significantly increased efficiency in the bridge design process. Because of the strong fragmentation of the architecture, engineering, and construction (AEC) industry, the data exchange between the different participants in a construction project is of crucial importance. The use of neutral, open data formats has proved to be the most suitable approach to realize this data exchange. However, currently existing neutral data formats do not allow for an exchange of parametric geometry. To overcome these technical limitations, this paper introduces an extension to the IFC-Bridge format, thus providing a means of interchanging parametric bridge models. This article describes in detail the necessary entities introduced to define parameters and capture dimensional and geometric constraints. The suitability of the developed extensions is proved by presenting the successful transfer of parametric bridge models between two parametric design systems as well as from a design system to a structural analysis system.}, language = {en} } @inproceedings{Hoeller, author = {H{\"o}ller, Christoph}, title = {Review and Comparison of ASTM and ISO Standards on Sound Transmission in Buildings}, series = {Impact of noise control engineering : 47th International Congress and Exposition on Noise Control Engineering (INTERNOISE 2018) : Chicago, Illinois, USA, 26-29 August 2018}, booktitle = {Impact of noise control engineering : 47th International Congress and Exposition on Noise Control Engineering (INTERNOISE 2018) : Chicago, Illinois, USA, 26-29 August 2018}, publisher = {Curran Associates, Inc.}, address = {Red Hook, NY}, language = {en} } @inproceedings{Hoege, author = {H{\"o}ge, Harald}, title = {The Use of Temporal Features in Cortical Segmentation of Syllables}, series = {Elektronische Sprachsignalverarbeitung 2024, Tagungsband der 35. Konferenz, Regensburg, 6.-8. M{\"a}rz 2024}, booktitle = {Elektronische Sprachsignalverarbeitung 2024, Tagungsband der 35. Konferenz, Regensburg, 6.-8. M{\"a}rz 2024}, editor = {Baumann, Timo}, publisher = {TUDpress}, address = {Dresden}, isbn = {978-3-95908-325-6}, doi = {10.35096/othr/pub-7082}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-70823}, pages = {70 -- 77}, abstract = {There is high confidence for the hypothesis that in speech perception the cycles of a θ-oscillation segment the auditory signal into syllables [8]. Yet the functionality of the oscillator generating the θ-oscillation is unknown. We follow the finding that, within an auditory scene, speech is perceived as a stream given by temporal coherence [12]. We work with the hypotheses that the θ-oscillator is driven by temporal features providing this coherence. We propose a new temporal feature called O-distance, which detects the onset of a syllable - the starting point to of a θ-cycle-triggered by the temporal distance from to to the instance of the maximal rise of the loudness curve of the vowel. To extract to from the auditory signal, we use the statistical properties of this distance based on the C-center hypothesis [25], which predicts a close temporal relation of the onset consonants to the onset of a vowel. The statistics are derived from reference O-distance extracted from an articulatory database, where the minima and maxima of the loudness are related to maxima and minima of the lower incisor and tongue tip. To judge the quality of the O-distance extracted from the auditory signal, we regard the temporal deviation of the O-distance to the reference O-distance. Currently we achieve a mean deviation of 34ms.}, language = {en} } @inproceedings{Kruspe, author = {Kruspe, Anna}, title = {More than words: Advancements and Challenges in Speech Recognition for Singing}, series = {Elektronische Sprachsignalverarbeitung 2024, Tagungsband der 35. Konferenz, Regensburg, 6.-8. M{\"a}rz 2024}, booktitle = {Elektronische Sprachsignalverarbeitung 2024, Tagungsband der 35. Konferenz, Regensburg, 6.-8. M{\"a}rz 2024}, editor = {Baumann, Timo}, publisher = {TUDpress}, address = {Dresden}, isbn = {978-3-95908-325-6}, doi = {10.35096/othr/pub-7074}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-70748}, pages = {1 -- 10}, abstract = {This paper addresses the challenges and advancements in speech recognition for singing, a domain distinctly different from standard speech recognition. Singing encompasses unique challenges, including extensive pitch variations, diverse vocal styles, and background music interference. We explore key areas such as phoneme recognition, language identification in songs, keyword spotting, and full lyrics transcription. I will describe some of my own experiences when performing research on these tasks just as they were starting to gain traction, but will also show how recent developments in deep learning and large-scale datasets have propelled progress in this field. My goal is to illuminate the complexities of applying speech recognition to singing, evaluate current capabilities, and outline future research directions.}, language = {en} } @inproceedings{Sering, author = {Sering, Konstantin}, title = {Speech/Non-Speech Classification Slightly Improves Synthesis Quality in PAULE}, series = {Elektronische Sprachsignalverarbeitung 2024, Tagungsband der 35. Konferenz, Regensburg, 6.-8. M{\"a}rz 2024}, booktitle = {Elektronische Sprachsignalverarbeitung 2024, Tagungsband der 35. Konferenz, Regensburg, 6.-8. M{\"a}rz 2024}, editor = {Baumann, Timo}, publisher = {TUDpress}, address = {Dresden}, isbn = {978-3-95908-325-6}, doi = {10.35096/othr/pub-7095}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-70955}, pages = {173 -- 180}, abstract = {One of the tasks PAULE[1, 2] solves is finding suitable control parameter (cp-)trajectories for a given target acoustic. These cp-trajectories can be used to synthesize speech with the articulatory speech synthesizer of the VocalTractLab (VTL) [3]. If the target acoustic contains substantial microphone noise or other background noises, occasionally PAULE optimizes not for the speech in the target, but for this background noises. By adding a speech/non-speech classifier to the feedback and planning-loop in PAULE this resynthesis of background noises should be mitigated. Unfortunately, the improvements were minor, which might be due to uninformative gradients of the classifier. The importance of informative gradients and the use classifiers to adapt PAULE to different tasks are explained and discussed.}, language = {en} } @misc{HeeseSchmidt, author = {Heese, Carl and Schmidt, Hans-Ludwig}, title = {Die Rolle der sozialen unterst{\"u}tzung in der neurologischen Fr{\"u}hrehabiltation}, series = {Rehabilitationswissenschaftliches Kolloquium, 16, 2007, Hannover}, journal = {Rehabilitationswissenschaftliches Kolloquium, 16, 2007, Hannover}, publisher = {WDV}, address = {Bad Homburg}, pages = {423 -- 424}, language = {de} } @inproceedings{HeydenreichSchliermannBungteretal., author = {Heydenreich, Patrick and Schliermann, Rainer and Bungter, Tanja and Anneken, Volker}, title = {Motivationale Faktoren von Menschen mit Sehsch{\"a}digungen in der beruflichen Rehabilitation}, series = {25. Rehabilitationswissenschaftliches Kolloquium - Deutscher Kongress f{\"u}r Rehabilitationsforschung: Gesundheitssystem im Wandel - Perspektiven der Rehabilitation ; vom 29. Februar bis 2. M{\"a}rz 2016 in Aachen}, booktitle = {25. Rehabilitationswissenschaftliches Kolloquium - Deutscher Kongress f{\"u}r Rehabilitationsforschung: Gesundheitssystem im Wandel - Perspektiven der Rehabilitation ; vom 29. Februar bis 2. M{\"a}rz 2016 in Aachen}, publisher = {Deutsche Rentenversicherung Bund}, address = {Berlin}, isbn = {978-3-9817814-1-0}, pages = {267 -- 268}, language = {de} } @article{ThiemePfingstenSchilleretal., author = {Thieme, H. and Pfingsten, Andrea and Schiller, S. and Spitzer, L. and Borgetto, Bernhard}, title = {Pr{\"a}diktoren der Teilnahme an Gespr{\"a}chskreisen und Funktionstraining von Patienten mit rheumatischen Erkrankungen.}, series = {Aktuelle Rheumatologie}, volume = {38}, journal = {Aktuelle Rheumatologie}, number = {6}, edition = {eFirst 18.9.2013}, publisher = {Thieme}, doi = {10.1055/s-0033-1353179}, pages = {375 -- 379}, language = {de} } @inproceedings{Pfingsten, author = {Pfingsten, Andrea}, title = {Gleichwertige Ber{\"u}cksichtigung externer und interner Validit{\"a}t quantitativer Studien in einem Systematischen Review zu komplexen Interventionen}, series = {Tagung "Evidenz@Hildesheim", Tagung Fakult{\"a}t Soziale Arbeit und Gesundheit, 26. Oktober 2013, Hildesheim}, booktitle = {Tagung "Evidenz@Hildesheim", Tagung Fakult{\"a}t Soziale Arbeit und Gesundheit, 26. Oktober 2013, Hildesheim}, language = {de} } @article{WuenscheBrinkmannGundlachetal., author = {W{\"u}nsche, Isabel and Brinkmann, Melanie and Gundlach, U. and Pfingsten, Andrea and Borgetto, Bernhard}, title = {Selbsthilfe von Menschen mit Alkoholabh{\"a}ngigkeit}, series = {T{\"a}gliche Praxis}, volume = {56}, journal = {T{\"a}gliche Praxis}, number = {3}, pages = {587 -- 597}, abstract = {Die Gesundheitsversorgung kommt ohne die Eigenverantwortung, Selbsthilfe und aktive Mitarbeit der Patient(inn)en nicht aus. Welche Mechanismen in Selbsthilfegruppen wirken, wurde bisher nicht im Einzelnen wissenschaftlich untersucht. Im Zusammenhang mit dem gesicherten Wissen {\"u}ber die salutogenen und terti{\"a}rpr{\"a}ventiven Wirkungsweisen von Kommunikation und sozialen Bindungen kann aus dem Stand der Selbsthilfeforschung jedoch ein allgemeines heuristisches Modell der Wirkung von Selbsthilfegruppen abgeleitet werden, welches kurz erl{\"a}utert wird. Alkoholbezogene Krankheiten haben in Deutschland eine besondere sozio{\"o}konomische Bedeutung. Menschen mit Alkoholabh{\"a}ngigkeit werden mithilfe multimodaler Therapiekonzepte (ambulante, teilstation{\"a}re oder station{\"a}re Interventionen) und vor allem durch die vielf{\"a}ltigen Angebote der Suchtselbsthilfe unterst{\"u}tzt. Vor allem Selbsthilfegruppen tragen zur gegenseitigen sozialen Unterst{\"u}tzung, zur Informationsaneignung und zu Einstellungs{\"a}nderungen bei den Betroffenen und in deren sozialem Umfeld bei. Sie entlasten die prim{\"a}ren Netzwerke der Betroffenen und unterst{\"u}tzen bei der gezielteren Inanspruchnahme professioneller Dienste. Sind die Ergebnisse und Schlussfolgerungen der Studien zur Wirksamkeit von Selbsthilfe bei Alkoholabh{\"a}ngigkeit aufgrund methodischer Schwierigkeiten der Wirkungsforschung auch limitiert, so sind sich doch die meisten Forscher einig, dass die Unterst{\"u}tzung durch Selbsthilfegruppen allein und in Kombination mit einer professionellen Versorgung das Erreichen und Erhalten der Alkoholabstinenz unterst{\"u}tzt. Selbsthilfeaktivit{\"a}ten werden zunehmend durch das Sozialversicherungssystem gef{\"o}rdert und in das Versorgungssystem integriert. Das Ungleichgewicht in der Kooperation zwischen Selbsthilfe und professionellem System kann durch ein Kennenlernen der regionalen Selbsthilfelandschaft mit ihren Strukturen, Unterst{\"u}tzungsleistungen und Besonderheiten ausgeglichen werden. Dieser Beitrag verringert durch die wissenschaftlich fundierte Darstellung der (Sucht-)Selbsthilfe m{\"o}gliche Handlungsunsicherheiten im Umgang mit Selbsthilfegruppen in der t{\"a}glichen Praxis.}, language = {de} } @book{Pfingsten, author = {Pfingsten, Andrea}, title = {Physiotherapie und Erwerbsarbeit von Patienten mit Beschwerden des unteren R{\"u}ckens}, publisher = {LIT-Verlag}, address = {Berlin}, isbn = {978-3-643-13027-3}, abstract = {Der vorliegende Band gibt einen {\"U}berblick {\"u}ber den Stand der quantitativen Forschung {\"u}ber physiotherapeutische Interventionen bei Schmerzen des unteren R{\"u}ckens. Die Evidenz aus beobachtenden und experimentellen Studien {\"u}ber die Effektivit{\"a}t hinsichtlich der Erwerbst{\"a}tigkeit wird in konkrete Behandlungsempfehlungen {\"u}berf{\"u}hrt. Die Entwicklung und Anwendung des zu diesem Zweck auf Basis der Forschungspyramide entwickelten Systems zur parit{\"a}tischen Bewertung von Studien aus beiden Ans{\"a}tzen wird veranschaulicht.}, language = {de} } @article{PfingstenSchillerTrickesetal., author = {Pfingsten, Andrea and Schiller, S. and Trickes, Claudia and Spitzer, Lena and Thieme, H. and Borgetto, Bernhard}, title = {Wirkungen von Gespr{\"a}chskreisen und Funktionstraining bei Patienten mit rheumatischen Erkrankungen}, series = {Aktuelle Rheumatologie}, volume = {38}, journal = {Aktuelle Rheumatologie}, number = {6}, publisher = {Thieme}, doi = {10.1055/s-0033-1357176}, pages = {380 -- 384}, abstract = {Hintergrund: Die ad{\"a}quate Versorgung von Personen, die von rheumatischen Erkrankungen betroffen sind, stellt eine Herausforderung dar, die ohne aktive Mitarbeit der Betroffenen und Selbsthilfe (SH) nicht bew{\"a}ltigt werden kann. In Anbetracht knapper {\"o}ffentlicher Ressourcen steht auch die mit staatlichen Mitteln unterst{\"u}tzte SH zunehmend in der Verantwortung, die Wirkung ihrer Angebote nachzuweisen. Patienten/Material und Methode: In einer beobachtenden prospektiven Studie wurden zu 4 Zeitpunkten im Abstand von 6 Monaten Frageb{\"o}gen an von rheumatischen Erkrankungen Betroffene verschickt. Diese wurden in verschiedenen Einrichtungen der gesundheitlichen Versorgung sowie in der Rheuma-Liga Baden-W{\"u}rttemberg rekrutiert. Erhoben wurden gesundheits- und personenbezogenen Faktoren, Versorgungsinformationen und ab der zweiten Welle der Gesundheitszustand sowie die Inanspruchnahme von SH-Angeboten. Es wurden u. a. durch Quer- sowie L{\"a}ngsschnittanalysen Nutzungsverhalten und Wirkung von Funktionstraining und Gespr{\"a}chskreisen bei von Fibromyalgie (FM) und Rheumatoider Arthritis (RA) betroffenen Erwachsenen analysiert. Ergebnisse: SH-Nutzer waren in ihrer Funk­tionskapazit{\"a}t st{\"a}rker eingeschr{\"a}nkt als Nicht-Nutzer. Dieser Unterschied ging prim{\"a}r auf Studienteilnehmer mit RA zur{\"u}ck. SH-Nutzer wurden mit Ausnahme der geringeren Behandlung von FM-Patienten durch einen Schmerztherapeuten leitliniengerechter {\"a}rztlich betreut und behandelt. SH-Angebote wurden von Patienten mit FM h{\"a}ufiger genutzt als von Personen mit RA. Es bestand ein Zusammenhang zwischen ­der Prozessqualit{\"a}t des Funktionstrainings (bes. Warmwassergymnastik) und der Funktionskapazit{\"a}t der Betroffenen. Die Ergebnisse hinsichtlich der Lebensqualit{\"a}t waren im Zeitverlauf widerspr{\"u}chlich und nicht interpretierbar. Die Funktionskapazit{\"a}t der Befragten nahm erwartungsgem{\"a}ß ab. Den deutlichsten R{\"u}ckgang zeigten SH-Nutzer mit RA, was nicht auf das Nutzungsverhalten zur{\"u}ckgef{\"u}hrt werden konnte. SH-Nutzer mit FM zeigten im Gegensatz zu Nicht-Nutzern nahezu keinen R{\"u}ckgang der Funktionskapazit{\"a}t. Dieser Unterschied konnte auf die Inanspruchnahme von SH-Angeboten zur{\"u}ckgef{\"u}hrt werden. Schlussfolgerung: Die Wirkung von SH-Angeboten konnte best{\"a}tigt werden, fiel aber in großen Teilen gering und bei Patienten mit RA hinsichtlich Funktionskapazit{\"a}t anscheinend negativ aus. Weitere Analysen der vorliegenden Daten sollten genutzt werden, um Maßnahmen zur Wirkungssteigerung zu entwickeln. Die Ergebnisse legen nahe, dass eine Steigerung der Prozessqualit{\"a}t der Angebote einen ersten Ansatz bietet.}, language = {de} } @article{WuenscheBrinkmannGundlachetal., author = {W{\"u}nsche, Isabel and Brinkmann, Melanie and Gundlach, U. and Pfingsten, Andrea and Borgetto, Bernhard}, title = {Selbsthilfe von Menschen mit Alkoholabh{\"a}ngigkeit}, series = {internistische praxis}, volume = {55}, journal = {internistische praxis}, number = {2}, pages = {349 -- 359}, abstract = {Die Gesundheitsversorgung kommt ohne die Eigenverantwortung, Selbsthilfe und aktive Mitarbeit der Patient(inn)en nicht aus. Welche Mechanismen in Selbsthilfegruppen wirken, wurde bisher nicht im Einzelnen wissenschaftlich untersucht. Im Zusammenhang mit dem gesicherten Wissen {\"u}ber die salutogenen und terti{\"a}rpr{\"a}ventiven Wirkungsweisen von Kommunikation und sozialen Bindungen kann aus dem Stand der Selbsthilfeforschung jedoch ein allgemeines heuristisches Modell der Wirkung von Selbsthilfegruppen abgeleitet werden, welches kurz erl{\"a}utert wird. Alkoholbezogene Krankheiten haben in Deutschland eine besondere sozio{\"o}konomische Bedeutung. Menschen mit Alkoholabh{\"a}ngigkeit werden mithilfe multimodaler Therapiekonzepte (ambulante, teilstation{\"a}re oder station{\"a}re Interventionen) und vor allem durch die vielf{\"a}ltigen Angebote der Suchtselbsthilfe unterst{\"u}tzt. Vor allem Selbsthilfegruppen tragen zur gegenseitigen sozialen Unterst{\"u}tzung, zur Informationsaneignung und zu Einstellungs{\"a}nderungen bei den Betroffenen und in deren sozialem Umfeld bei. Sie entlasten die prim{\"a}ren Netzwerke der Betroffenen und unterst{\"u}tzen bei der gezielteren Inanspruchnahme professioneller Dienste. Sind die Ergebnisse und Schlussfolgerungen der Studien zur Wirksamkeit von Selbsthilfe bei Alkoholabh{\"a}ngigkeit aufgrund methodischer Schwierigkeiten der Wirkungsforschung auch limitiert, so sind sich doch die meisten Forscher einig, dass die Unterst{\"u}tzung durch Selbsthilfegruppen allein und in Kombination mit einer professionellen Versorgung das Erreichen und Erhalten der Alkoholabstinenz unterst{\"u}tzt. Selbsthilfeaktivit{\"a}ten werden zunehmend durch das Sozialversicherungssystem gef{\"o}rdert und in das Versorgungssystem integriert. Das Ungleichgewicht in der Kooperation zwischen Selbsthilfe und professionellem System kann durch ein Kennenlernen der regionalen Selbsthilfelandschaft mit ihren Strukturen, Unterst{\"u}tzungsleistungen und Besonderheiten ausgeglichen werden. Dieser Beitrag verringert durch die wissenschaftlich fundierte Darstellung der (Sucht-)Selbsthilfe m{\"o}gliche Handlungsunsicherheiten im Umgang mit Selbsthilfegruppen in der t{\"a}glichen Praxis.}, language = {de} } @article{PfingstenBorgetto, author = {Pfingsten, Andrea and Borgetto, Bernhard}, title = {Physiotherapie in der Rheumatologie. Versorgungsbedarf aus Sicht von Patienten}, series = {Aktuelle Rheumatologie}, volume = {38}, journal = {Aktuelle Rheumatologie}, number = {1}, publisher = {Georg Thieme Verlag}, doi = {10.1055/s-0032-1311574}, pages = {50 -- 54}, abstract = {Hintergrund: Die Effektivit{\"a}t von Physiotherapie bei rheumatischen Erkrankungen, die aus experimentellen Studien zu erwarten ist, kann unter Alltagsbedingungen nicht erreicht werden. Ziel der hier vorgestellten Studie ist es, durch Erhebung des Versorgungsbedarfs aus Sicht der Patienten dazu beizutragen, die Diskrepanz zu verringern. Patienten/Material und Methode: 5 Patienten mit rheumatischen Erkrankungen wurden in qualitativen Interviews hinsichtlich der Versorgung mit Physiotherapie befragt. Ergebnisse: Die Befragten bewerten Physiotherapie als wichtigen Bestandteil der Versorgung. Sie halten die derzeitige Versorgung f{\"u}r nicht ausreichend und wenig auf symptomatische und andere Parameter abgestimmt. Pers{\"o}nliches Engagement und der verordnende Arzt werden als Haupteinflussfaktoren auf die Versorgung mit Therapie empfunden. Von Therapeuten erwarten sie eine Spezialisierung auf rheumatische Erkrankungen und besonderes Einf{\"u}hlungsverm{\"o}gen. Schlussfolgerung: Eine st{\"a}rkere Abstimmung der Verordnungen und Interventionen auf die Bed{\"u}rfnisse der Betroffenen und eine Steigerung der Therapiequalit{\"a}t durch Spezialisierung k{\"o}nnte helfen, die potenziellen Effekte in der Routineversorgung zu erzielen.}, language = {de} } @article{BorgettoTomlinTrickesetal., author = {Borgetto, Bernhard and Tomlin, George S. and Trickes, Claudia and Max, Susanne and Pfingsten, Andrea}, title = {Die Forschungspyramide - Evidenz f{\"u}r die ergotherapeutische Praxis. Ein Update}, series = {Ergoscience}, volume = {10}, journal = {Ergoscience}, number = {1}, doi = {10.2443/skv-s-2015-54020150104}, pages = {30 -- 34}, abstract = {F{\"u}r die Aufbereitung und Systematisierung wissenschaftlicher Forschungsergebnisse und die Beantwortung klinischer Fragestellungen im Hinblick auf Entscheidungen in der allt{\"a}glichen Versorgungspraxis bietet die Forschungspyramide ein Modell zur Bewertung und Integration externer Evidenz aus unterschiedlichen Forschungsans{\"a}tzen. Dieser Beitrag bietet ein Update zu den neueren Entwicklungen und dem aktuellen Stand des Modells sowie den Grundlagen eines Pyramidenreviews.}, language = {de} } @article{Pfingsten, author = {Pfingsten, Andrea}, title = {Die Forschungspyramide: wirklichkeitsnahe Evidenz f{\"u}r die Praxis. Integration der Ergebnisse unterschiedlicher Forschungsans{\"a}tze f{\"u}r die Physiotherapie}, series = {pt - Zeitschrift f{\"u}r Physiotherapeuten}, volume = {65}, journal = {pt - Zeitschrift f{\"u}r Physiotherapeuten}, number = {12}, publisher = {Pflaum}, address = {M{\"u}nchen}, issn = {1614-0397}, pages = {76 -- 78}, language = {de} } @article{BorgettoPfingsten, author = {Borgetto, Bernhard and Pfingsten, Andrea}, title = {Evidenzbasierte Physiotherapie. Strukturelle Verankerung im Deutschen Netzwerk f{\"u}r Evidenzbasierte Medizin}, series = {pt - Zeitschrift f{\"u}r Physiotherapeuten}, volume = {64}, journal = {pt - Zeitschrift f{\"u}r Physiotherapeuten}, number = {5}, publisher = {Pflaum}, address = {M{\"u}nchen}, issn = {1614-0397}, pages = {82 -- 83}, language = {de} } @article{DendorferMaierTayloretal., author = {Dendorfer, Sebastian and Maier, Hans J{\"u}rgen and Taylor, David and Hammer, Joachim}, title = {Anisotropy of the fatigue behaviour of cancellous bone}, series = {Journal of Biomechanics}, volume = {41}, journal = {Journal of Biomechanics}, number = {3}, doi = {10.1016/j.jbiomech.2007.09.037}, pages = {636 -- 641}, abstract = {The fatigue behaviour of materials is of particular interest for the failure prediction of materials and structures exposed to cyclic loading. For trabecular bone structures only a few sets of lifetime data have been reported in the literature and structural measures are commonly not considered. The influence of load contributions which are not aligned with the main physiological axis remains unclear. Furthermore site and species dependent relationships are not well described. In this study five different groups of trabecular bone, defined in terms of orientation, species and site were exposed to cyclic compression. In total, 108 fatigue tests were analysed. The lifetimes were found to decrease drastically when off-axis loads were applied. Additionally, species and site strongly affect fatigue lifetimes. Strains at failure were also found to be a function of orientation.}, subject = {Erm{\"u}dung}, language = {en} } @incollection{DendorferHammerLenich, author = {Dendorfer, Sebastian and Hammer, Joachim and Lenich, Andreas}, title = {Characterisation and testing of biomaterials}, series = {Basic Engineering for Medics and Biologists: An ESEM Primer}, booktitle = {Basic Engineering for Medics and Biologists: An ESEM Primer}, number = {Chapter IV.4.}, editor = {Lee, T. Clive and Niederer, Peter F.}, publisher = {Non Basic Stock Line}, isbn = {978-1607505266}, subject = {Biomaterial}, language = {en} } @article{KellnerUtz, 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}, publisher = {Springer Nature}, doi = {10.1016/j.jclepro.2018.12.315}, pages = {462 -- 474}, 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} } @article{KellnerLienlandUtz, 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}, publisher = {Wiley}, doi = {10.1111/jiec.13148}, pages = {1412 -- 1429}, 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{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{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} } @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} } @article{KellnerIgl, 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}, publisher = {Elsevier}, doi = {10.1016/j.jclepro.2015.03.026}, pages = {177 -- 191}, 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{BossmannVoigtRadloffSBraunCLaueretal., author = {Boßmann, T. and Voigt-Radloff, S., Braun, C., and Lauer, Norina and Marotzki, Ulrike}, title = {Praxisbasierte Forschungsnetzwerke: Expertinneninterviews zur Umsetzung in der Physiotherapie, Ergotherapie und Logop{\"a}die}, series = {L.O.G.O.S. Interdisziplinair}, volume = {25}, journal = {L.O.G.O.S. Interdisziplinair}, number = {3}, publisher = {ProLog, Therapie- und Lernmittel OHG}, address = {K{\"o}ln}, issn = {0944-405X}, pages = {194 -- 201}, language = {de} } @article{Kellner, 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}, number = {3}, publisher = {Springer Nature}, doi = {10.1007/s00291-022-00675-y}, pages = {833 -- 874}, 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} } @unpublished{KellnerSchneiderbauer, 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 = {SSRN Electronic Journal}, journal = {SSRN Electronic Journal}, doi = {10.2139/ssrn.3221764}, 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} } @article{FuchsBeckLienlandetal., 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}, publisher = {emerald insight}, doi = {10.1108/JEIM-03-2017-0038}, pages = {64 -- 88}, 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{LienlandBaumgartnerKnubben, author = {Lienland, Bernhard and Baumgartner, Alexander and Knubben, Evelyn}, title = {The undervaluation of corporate reputation as a supplier selection factor}, series = {Journal of Purchasing and Supply Management}, volume = {19}, journal = {Journal of Purchasing and Supply Management}, number = {2}, publisher = {Elsevier}, issn = {1478-4092}, doi = {10.1016/j.pursup.2013.04.001}, pages = {84 -- 97}, abstract = {Prior research studies on supplier selection factors assess vendor reputation as a low ranked criterion. Reputation in these articles, however, only refers to the position in the industry, without considering the role of the final customer. Our results from a survey with 565 individuals suggest that the end user as a stakeholder should be also considered when analyzing a vendor's prestige. We demonstrate that a supplier's standing has negative as well as positive reputational effects on the buyer. Depending on the relevance of the purchased good as well as the reputation of the supplier and the buyer, low/high-ranked ingredients significantly decrease/increase the final customer's perception of the buyer.}, language = {en} } @article{Kellner, 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}, publisher = {Emerald}, doi = {10.1108/JABES-12-2019-0127}, pages = {101 -- 120}, 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} } @article{NeumuellerKellnerGuptaetal., 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}, publisher = {Taylor \& Francis}, doi = {10.1080/00207543.2014.939241}, pages = {409 -- 434}, 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{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{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} } @article{KellnerUtz, author = {Kellner, Florian and Utz, Sebastian}, title = {An inverse optimization approach for studying sustainability preferences in sourcing decisions}, series = {Journal of Cleaner Production}, volume = {483}, journal = {Journal of Cleaner Production}, publisher = {Elsevier}, doi = {10.1016/j.jclepro.2024.144305}, abstract = {Throughout many societies around the globe, there is growing awareness of the urgent need for the transition towards a sustainable economy. Research shows that buying firms have substantial leverage to initiate sustainable development by controlling the sustainable performance of their suppliers. In that context, this article presents a novel methodology based on inverse optimization to derive the implicit preferences of decision-makers in the trade-off between traditional sourcing objectives and sustainability in the supplier selection and order allocation process. The derived implicit preferences can then be used for further analyses to gain a better understanding of the characteristics of purchasing managers and sourcing situations that come with particularly high/low preferences placed on sustainability. Since the inverse optimization approach is computationally resource-intensive and consumes a significant amount of time, we present a scalable state-of-the-art cloud architecture that allows solving an arbitrary number of optimization programs in an acceptable amount of time. We demonstrate the feasibility of the proposed methodology in a real-world case. In doing so, we test how important sustainability aspects are in the supplier selection and order allocation decisions of one of the world's largest automotive parts manufacturers.}, language = {en} } @incollection{OttoLukeschBrabaenderetal., 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 Brill}, isbn = {9783110473803}, doi = {10.1515/9783110473803-039}, pages = {737 -- 758}, 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 (Netzpla-nung, 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} } @article{BraunKunklerKellner, 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}, publisher = {MDPI}, doi = {10.3390/su12198145}, 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{ObermaierHofmannKellner, author = {Obermaier, Robert and Hofmann, Johann and Kellner, Florian}, title = {Webbasierte Fertigungssteuerung in der Praxis: Pruduktivit{\"a}tssteigerungen mit dem Manufacturing-Execution-Sytem MR-CM©}, series = {HMD Praxis der Wirtschaftsinformatik}, volume = {47}, journal = {HMD Praxis der Wirtschaftsinformatik}, number = {2}, publisher = {Springer Nature}, doi = {10.1007/BF03340455}, pages = {49 -- 59}, 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 = {en} } @article{KunklerBraunKellner, 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}, publisher = {MDPI}, doi = {10.3390/su13010395}, 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} } @article{LienlandZeng, author = {Lienland, Bernhard and Zeng, Li}, title = {A Review and Comparison of Genetic Algorithms for the 0-1 Multidimensional Knapsack Problem}, series = {International Journal of Operations Research and Information Systems (IJORIS)}, volume = {6}, journal = {International Journal of Operations Research and Information Systems (IJORIS)}, number = {2}, publisher = {IGI Global}, issn = {1947-9328}, doi = {10.4018/ijoris.2015040102}, pages = {11}, abstract = {The 0-1 multidimensional knapsack problem (MKP) is a well-known combinatorial optimization problem with several real-life applications, for example, in project selection. Genetic algorithms (GA) are effective heuristics for solving the 0-1 MKP. Multiple individual GAs with specific characteristics have been proposed in literature. However, so far, these approaches have only been partially compared in multiple studies with unequal conditions. Therefore, to identify the "best" genetic algorithm, this article reviews and compares 11 existing GAs. The authors' tests provide detailed information on the GAs themselves as well as their performance. The authors validated fitness values and required computation times in varying problem types and environments. Results demonstrate the superiority of one GA.}, language = {en} } @article{KempfLauerCorstenetal., author = {Kempf, Sabrina and Lauer, Norina and Corsten, Sabine and Voigt-Radloff, Sebastian}, title = {Potential analysis of research on speech therapy-led communication training in aphasia following stroke}, series = {Zeitschrift f{\"u}r Evidenz, Fortbildung und Qualitat im Gesundheitswesen}, volume = {108}, journal = {Zeitschrift f{\"u}r Evidenz, Fortbildung und Qualitat im Gesundheitswesen}, number = {1, Suppl. 1}, publisher = {Elsevier}, doi = {10.1016/j.zefq.2014.08.002}, pages = {45 -- 52}, abstract = {Health problem: In Germany, about 100,000 people currently suffer from aphasia. This speech disorder occurs as a result of neurologic events such as stroke or traumatic brain injury. Aphasia causes major limitations in social participation and quality of life and can be associated with unemployability and social isolation. For affected persons, it is essential to regain and maintain autonomy in daily life, both at work and with family and friends. The loss of autonomy is perceived much more dramatically than the loss of speech. Clients wish to minimise this loss of autonomy in daily life. As full recovery is not achievable in chronic aphasia, treatment must focus on improved compensatory approaches and on supporting the clients' coping strategies. Evidence base: Based on eight randomised comparisons including 347 participants, a recent Cochrane review (Brady et al., 2012) revealed that speech therapy - as compared with no treatment - had positive effects on functional communication in clients suffering from aphasia (0.30 SMD; 95\% CI[0.08 to 0.52]). There was no evidence suggesting that one type of training was superior to the others. However, quality of life and social participation were not evaluated as outcomes. Recent studies found that speech therapy-led training for communication and self-efficacy and the integration of communication partners may have a positive impact on these client-centred outcomes. Implication for research: Speech therapy-led training for communication within a group setting should be manualised and pilot-tested with respect to feasibility and acceptance in a German sample of people with aphasia and their communication partners. Instruments measuring quality of life and social participation can be validated within the scope of this feasibility study. These research efforts are necessary to prepare a large-scale comparative effectiveness research trial comparing the effects of both usual speech therapy and speech therapy-led group communication training on quality of life and social participation.}, language = {en} } @article{KellnerSchneiderbauer, 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}, publisher = {Elsevier}, doi = {10.1016/j.ejor.2019.04.007}, pages = {296 -- 313}, 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} } @incollection{KellnerLienlandUtz, 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), 08-09 November 2020, Sakheer, Bahrain}, booktitle = {2020 International Conference on Decision Aid Sciences and Application (DASA), 08-09 November 2020, Sakheer, Bahrain}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-1-7281-9677-0}, doi = {10.1109/DASA51403.2020.9317094}, pages = {95 -- 98}, 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} } @article{KellnerOttoBrabaender, 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}, publisher = {Elsevier}, doi = {10.1016/j.trpro.2017.05.458}, pages = {794 -- 805}, 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} } @incollection{KellnerLienlandLukesch, author = {Kellner, Florian and Lienland, Bernhard and Lukesch, Maximilian}, title = {Produktionsfaktoren}, series = {Produktionswirtschaft : Planung, Steuerung und Industrie 4.0}, booktitle = {Produktionswirtschaft : Planung, Steuerung und Industrie 4.0}, publisher = {Springer Gabler}, address = {Berlin; Heidelberg}, isbn = {978-3-662-65802-4}, doi = {10.1007/978-3-662-65803-1_2}, pages = {31 -- 158}, abstract = {Kap. 2 bespricht die Produktionsfaktoren Mensch, Betriebsmittel und Material sowie den Faktor „Information" als Grundlage der betrieblichen Leitung. Der Abschnitt "Produktionsfaktor Mensch" beschreibt u. a. Maßnahmen zur Erh{\"o}hung der menschlichen Arbeitsleistung durch eine entsprechende Arbeits- und Lohngestaltung. Beim Produktionsfaktor Betriebsmittel werden Organisationstypen der Fertigung diskutiert und Detailprobleme vorgestellt, die sich durch die Wahl eines bestimmten Organisationstyps ergeben. Der Abschnitt Produktionsfaktor Material zeigt, welche Profitabilit{\"a}tswirkung durch eine Materialstandardisierung erreicht werden kann und wie sich Materialien klassifizieren lassen, um geeignete Dispositionsstrategien abzuleiten. Danach wird auf die von der betrieblichen Leitung genutzten Informationen und Informationssysteme eingegangen. Dabei wird zun{\"a}chst eine typische industrielle IT-Systemlandschaft mit Fokus auf Supply-Chain-Management-Systeme vorgestellt und abschließend die Informationstr{\"a}ger „St{\"u}ckliste" und „Arbeitsplan" besprochen.}, language = {de} } @article{KellnerLienlandUtz, 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}, publisher = {Springer}, doi = {10.1016/j.ejor.2018.06.044}, pages = {505 -- 522}, 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{IglKellner, 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}, publisher = {Elsevier}, doi = {10.1016/j.trd.2016.10.008}, pages = {55 -- 69}, 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} } @article{KellnerIgl, 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}, publisher = {Springer Nature}, doi = {10.1007/s12159-012-0063-3}, pages = {87 -- 99}, 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{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{KraftQuaysonKellner, author = {Kraft, Sarah Katharina and Quayson, Matthew and Kellner, Florian}, title = {Assessing the German Act on Corporate Due Diligence Obligations in Supply Chains: a perspective from the smallholder cocoa farmer}, series = {Frontiers in Sustainability}, volume = {5}, journal = {Frontiers in Sustainability}, publisher = {frontiers}, doi = {10.3389/frsus.2024.1376619}, abstract = {This research examines the potential outputs, outcomes, and impacts of the German Act on Corporate Due Diligence Obligations in Supply Chains (LkSG) on the smallholder cocoa farmers in West Africa. The study primarily relies on a literature review and an impact pathway to conduct a systematic analysis to identify the potential effects of the LkSG on smallholder cocoa farmers. The findings indicate that some, but not all of the risks addressed by the LkSG align with those faced by smallholder cocoa farmers and their families. Additionally, the research also reveals weaknesses, particularly in managing environmental risks, which the LkSG does not adequately cover. Our findings show that in the short- and medium-term, the LkSG has no potential effects on smallholder cocoa farmers. Furthermore, the potential positive impacts of the law on smallholder cocoa farmers will take a long time to realize, as the LkSG considers primarily tier-1 suppliers. Companies in Germany might reassess their supply chains to strive for an LkSG-risk-free supply chain, which could in the long term have sustained impacts on smallholder cocoa farmers. However, we recommend a comprehensive risk analysis of the cocoa supply chain to enhance the human rights of cocoa farmers.}, language = {en} } @inproceedings{KellnerSchroder, author = {Kellner, Florian and Schroder, Nadine}, title = {Location Planning \& Analysis Using Uncertain Data}, series = {2021 International Conference on Decision Aid Sciences and Application (DASA), 07-08 December 2021, Sakheer, Bahrain}, booktitle = {2021 International Conference on Decision Aid Sciences and Application (DASA), 07-08 December 2021, Sakheer, Bahrain}, publisher = {IEEE}, address = {Piscataway, NJ}, isbn = {978-1-6654-1634-4}, doi = {10.1109/DASA53625.2021.9682323}, pages = {720 -- 723}, 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{KraftKellner, 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}, publisher = {MDPI}, doi = {10.3390/su14138044}, 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} }