@article{WeissGarloff, author = {Weiss, Matthias and Garloff, Alfred}, title = {Skill-biased technological change and endogenous benefits: The dynamics of unemployment and wage inequality}, series = {Applied Economics}, volume = {43}, journal = {Applied Economics}, number = {7}, publisher = {Taylor \& Francis}, issn = {1466-4283}, doi = {10.1080/00036840802599933}, url = {http://nbn-resolving.de/urn:nbn:de:0168-ssoar-242195}, pages = {811 -- 821}, abstract = {In this paper, we study the effect of skill-biased technological change on unemployment and wage inequality in the presence of a link between social benefits and average income. In this case, an increase in the productivity of skilled workers and hence their wage leads to an increase in average income and hence in benefits. The increased fallback income, in turn, makes unskilled workers ask for higher wages. As higher wages are not justified by respective productivity increases, unemployment rises. More generally, we show that skill-biased technological change leads to increasing unemployment of the unskilled and to a moderately increasing wage inequality when benefits are endogenous. The model provides a theoretical explanation for diverging dynamics in wage inequality and unemployment under different social benefits regimes: Analyzing the social legislation in 14 countries, we find that benefits are linked to the evolution of average income in Continental Europe but not in the U.S. and the UK. Given this institutional difference, our model predicts that skill-biased technological change leads to rising unemployment in Continental Europe and rising wage inequality in the U.S. and the UK....}, language = {en} } @article{StichelLaumerLinnenweberetal., author = {Stichel, Thomas and Laumer, Tobias and Linnenweber, Tim and Amend, Philipp and Roth, Stephan}, title = {Mass Flow Characterization of Selective Deposition of Polymer Powders with Vibrating Nozzles for Laser Beam Melting of Multi-material Components}, series = {Physics Procedia}, volume = {83}, journal = {Physics Procedia}, publisher = {Elsevier}, address = {Amsterdam [u.a.]}, issn = {1875-3892}, doi = {10.1016/j.phpro.2016.08.099}, pages = {947 -- 953}, abstract = {The generation of multi-material components by laser beam melting (LBM) is a challenge which requires the invention of new coating devices for preparation of arbitrary powder patterns. One solution is the usage of vibration-controlled nozzles for selective deposition of polymer powders. Powder flow can be initiated by vibration enabling a start-stop function without using any mechanical shutter. In this report, the delivery of polymer powder by vibrating nozzles is investigated with respect to their application in LBM machines. Therefore, a steel nozzle attached to a piezo actor and a weighing cell is used in order to measure the stability and time-dependence of the powder mass flow upon vibration excitation with the usage of different kind of powder formulations. The results show that precompression of the powder inside the nozzle by vibration excitation is essential to realize a reliable start-stop function with reproducible discharge cyles and to prevent a initial flush of powder flow. Moreover, the use of different powder materials showed that mass flow is even possible with powders which are not optimized regarding flowability, but is readily enhanced with a factor of 2 to 3 by admixing Aerosil® fumed silica.}, language = {en} } @article{StichelAmendLaumeretal., author = {Stichel, Thomas and Amend, Philipp and Laumer, Tobias and Roth, Stephan}, title = {Polymer Powder Deposition using Vibrating Capillary Nozzles for Additive Manufacturing}, series = {Information, Communication and Automation Technologies (ICAT), 2014, Wien}, journal = {Information, Communication and Automation Technologies (ICAT), 2014, Wien}, abstract = {Abstract — In this report, the dry delivery of polyamide 12 (PA 12) powder for the preparation of powder layers in laser beam melting (LBM) is investigated. Therefore, an experimental setup was built which consists of a glass nozzle assembled on a piezo-electric actuator. By applying a sinusoidal voltage signal to the actuator, the nozzle is set into vibration mode which enhances the powder delivery through the nozzle. By using this effect, powder mass flow is controlled and a valve-like start and stop function is realized. In order to identify suitable process parameters, a broad range of vibration modes were investigated using two nozzles made from glass with different orifice diameters. Therefore, the vibration frequency and the voltage signal of the actuator were varied and the resulting mass flow was detected by a balance. It was found that both the frequency and the voltage signal affect the mass flow and its stability but with different impact. Moreover, powder lines were deposited with different velocities in order to characterize the setup regarding applicability for highly selective powder deposition for LBM.}, language = {en} } @article{StichelLaumerBaumuelleretal., author = {Stichel, Thomas and Laumer, Tobias and Baum{\"u}ller, Tobias and Amend, Philipp and Roth, Stephan}, title = {Powder Layer Preparation Using Vibration-controlled Capillary Steel Nozzles for Additive Manufacturing}, series = {Physics Procedia}, volume = {56}, journal = {Physics Procedia}, publisher = {Elsevier}, issn = {1875-3892}, doi = {10.1016/j.phpro.2014.08.158}, pages = {157 -- 166}, abstract = {In this report, the dry delivery of polyamide 12 powders by vibrating capillary steel nozzles is investigated and discussed regarding its potential for powder layer preparation in Laser Beam Melting. Therefore, a setup including a steel nozzle assembled on a piezoelectric actuator is presented, which enables the precise control over very small powder quantities by vibration excitation. An analysis reveals that the mass flow through the nozzle can be adjusted by the vibration modes in a certain range depending on the nozzle's specifications, whereas the vibration modes themselves show a complicated behaviour. Using a positioning system in combination with the vibrating nozzle, single-layer patterns consisting of polyamide 12 are produced and characterized regarding surface homogeneity and selectivity using a laser stripe sensor.}, language = {en} } @article{LaumerStichelRiedlbaueretal., author = {Laumer, Tobias and Stichel, Thomas and Riedlbauer, Daniel and Amend, Philipp and Mergheim, Julia and Schmidt, Michael}, title = {Realization of multi-material polymer parts by simultaneous laser beam melting}, series = {Journal of Laser Micro / Nanoengineering}, volume = {10}, journal = {Journal of Laser Micro / Nanoengineering}, number = {2}, publisher = {Japan Laser Processing Society}, abstract = {In this paper, first results regarding the realization of multi-material parts by Simultaneous Laser Beam Melting (SLBM) of polymers are presented. This new approach allows the layerwise generation of parts consisting of different polymer materials within one building process. Besides the typical advantages of additive manufacturing technologies, such parts can fulfill different product requirements concomitant and therefore could enlarge the overall field of application. The powder materials used for this paper are polyethylene (PE) and a polyamide based thermoplastic elastomer (TPE). After depositing the powder materials next to each other, infrared-emitters heat the lower melting polymer and a CO2 laser provides the preheating temperature of the higher melting polymer. In the last step, a thulium fibre laser melts the two preheated powders simultaneously. The realized specimens are characterized by cross sections and their tensile strengths are determined. Additionally, the new approach of the simultaneous energy irradiation is investigated using a Finite Element Analysis in order to gain a more profound process understanding. In that sense, the influence of the size of the exposure area on the reachable maximum temperatures inside that area was analyzed by the simulation and compared to experimental studies.}, language = {en} } @article{LaumerStichelAmendetal., author = {Laumer, Tobias and Stichel, Thomas and Amend, Philipp and Schmidt, Michael}, title = {Simultaneous laser beam melting of multimaterial polymer parts}, series = {Journal of Laser Applications}, volume = {27}, journal = {Journal of Laser Applications}, number = {S2}, publisher = {Laser Institute of America}, issn = {1938-1387}, doi = {10.2351/1.4906303}, abstract = {By simultaneous laser beam melting (SLBM), parts consisting of different polymer powders can be additively manufactured within one building process. Besides the advantages of conventional LBM, e.g., not needing additional tools and being able to realize parts with almost any geometry, different product requirements can be achieved within a single part. Product requirements may be different chemical resistances or haptic material properties. Therefore, SLBM enlarges the application field for additive manufacturing in general. In the process, two different materials are deposited on the building platform and preheated a few degrees below the melting temperature of the lower melting polymer by infrared emitters. Afterward, a CO2 laser (λ = 10.6 μm) provides the energy for the temperature difference between the preheating temperatures of both materials. Finally, a digital light processing chip is used to achieve simultaneous and flexible energy deposition for melting both preheated polymers. By illuminating the chip with a laser, parts of the beam can be flexibly guided onto the powder bed or into a beam trap. As laser, a single mode thulium laser (λ = 1.94 μm) is used. After melting the layer, a new layer is deposited and the process starts anew. In this paper, polypropylene and polyamide 12 are used as materials. After analyzing the material and melting behavior during the process by a high-resolution thermal imaging system, the parts are qualified regarding their material compatibility at the boundary zone and porosity by cross sections.}, language = {en} } @article{StichelGeisslerJanderetal., author = {Stichel, Thomas and Geißler, Bastian and Jander, Julius and Laumer, Tobias and Frick, Thomas and Roth, Stephan}, title = {Electrophotographic multi-material powder deposition for additive manufacturing}, series = {Journal of Laser Applications}, volume = {30}, journal = {Journal of Laser Applications}, number = {3}, publisher = {AIP Publishing}, doi = {10.2351/1.5040619}, abstract = {In this paper, the use of electrophotographic polymer powder transfer for the preparation of multi-material layers is discussed with respect to the application in powder bed-based additive manufacturing technologies as selective laser sintering (SLS). Therefore, the challenges of this task are considered verifying the critical process steps in order to develop a concept for an electrophotograhic laser sintering machine. On that basis, an experimental setup with a two-chamber design is realized which enables the investigation of the electrophotographic powder transfer at typical process conditions of SLS. Using this setup, transfer tests of polypropylene powder patterns were performed and qualitatively analyzed by photographic imaging. The results confirm the high potential of the application of electrophotography for multi-material powder deposition and show how a residual electrophotographic powder deposition can be achieved in general, which is independent from the already produced part height, in order to build up three-dimensional multi-material components.}, language = {en} } @article{StichelLaumerSchmidt, author = {Stichel, Thomas and Laumer, Tobias and Schmidt, Michael}, title = {Simulation des (quasi-)simultanen Laserstrahlschmelzens zur Herstellung von Multi-Material-Bauteilen aus Polymeren}, series = {Rapid.Tech + FabCon 3.D - International Trade Show + Conference for Additive Manufacturing}, journal = {Rapid.Tech + FabCon 3.D - International Trade Show + Conference for Additive Manufacturing}, publisher = {Hanser}, doi = {10.3139/9783446458123.020}, pages = {312 -- 329}, language = {en} } @article{Richter, author = {Richter, Stefanie}, title = {Integrated Care for People with Dementia}, series = {Geriatrics}, volume = {2}, journal = {Geriatrics}, number = {1}, publisher = {MDPI}, address = {Basel}, doi = {10.3390/geriatrics2010001}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:898-opus4-22091}, pages = {1 -- 13}, abstract = {This article presents results of the social-scientific evaluation of an established care model for people with dementia developed by the professionals as a result of acute problems in care in north-east Germany. In addition to the central elements of the model, the conditions of intersectoral and interprofessional cooperation as well as the qualification profile requirements of the professional groups involved are presented in detail. The results can give suggestions for the organization of integrated care for people with dementia in other countries. Further, the author would hereby like to highlight the gain from the scientific examination of solutions to problems in the field.}, subject = {Demenz}, language = {en} } @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} } @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} } @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} } @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} } @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} } @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} } @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} }