@incollection{Heese, author = {Heese, Carl}, title = {Soziale Arbeit als Weiterbildungsziel: Zur Professions- und Karriereentwicklung in der Heilp{\"a}dagogik}, series = {Akademische Weiterbildung f{\"u}r soziale Berufe: Theoretische, empirische und praktische Aspekte}, booktitle = {Akademische Weiterbildung f{\"u}r soziale Berufe: Theoretische, empirische und praktische Aspekte}, editor = {Sch{\"o}pf, Nicolas}, publisher = {wbv}, address = {Bielefeld}, isbn = {3763966463}, pages = {55 -- 64}, abstract = {Die Akademisierung hat f{\"u}r die Mitarbeiter:innen der Heilp{\"a}dagogik ebenso neue Optionen geschaffen wie f{\"u}r die der Pflege und die der Einrichtungen der Fr{\"u}hen Bildung. Dabei f{\"u}hrt der berufliche Bildungsweg in der Heilp{\"a}dagogik aber h{\"a}ufig nicht aus der Heilerziehungspflege zum Studium der Heilp{\"a}dagogik oder der entsprechenden Lehramtsstudieng{\"a}nge, sondern zur Sozialen Arbeit. Der Beitrag geht diesem Sachverhalt mit {\"U}berlegungen zur Strukturentwicklung in der beruflichen und akademischen Ausbildung nach. Das Studium der Sozialen Arbeit im Anschluss an eine Ausbildung in der Heilerziehungspflege erscheint demnach als stimmige Fortf{\"u}hrung. F{\"u}r sie spricht neben pragmatischen Vorteilen eine breite {\"U}berschneidung der beiden Disziplinen im Bereich der Behindertenhilfe, die historisch mit der heilp{\"a}dagogischen Abteilung der Kinderklinik des Universit{\"a}tskrankenhauses Wien schon einmal eine Gestalt gewonnen hatte, bei der sogar von einer Identit{\"a}t im Programm und der institutionellen Umsetzung der beiden Disziplinen gesprochen werden kann.}, language = {de} } @article{MennickenPeterKaulenetal., author = {Mennicken, Max and Peter, Sophia Katharina and Kaulen, Corinna and Simon, Ulrich and Karth{\"a}user, Silvia}, title = {Impact of device design on the electronic and optoelectronic properties of integrated Ru-terpyridine complexes}, series = {Beilstein journal of nanotechnology}, volume = {13}, journal = {Beilstein journal of nanotechnology}, publisher = {Beilstein-Institut zur F{\"o}rderung der Chemischen Wissenschaften}, doi = {10.3762/bjnano.13.16}, pages = {219 -- 229}, abstract = {The performance of nanoelectronic and molecular electronic devices relies strongly on the employed functional units and their addressability, which is often a matter of appropriate interfaces and device design. Here, we compare two promising designs to build solid-state electronic devices utilizing the same functional unit. Optically addressable Ru-terpyridine complexes were incorporated in supramolecular wires or employed as ligands of gold nanoparticles and contacted by nanoelectrodes. The resulting small-area nanodevices were thoroughly electrically characterized as a function of temperature and light exposure. Differences in the resulting device conductance could be attributed to the device design and the respective transport mechanism, that is, thermally activated hopping conduction in the case of Ru-terpyridine wire devices or sequential tunneling in nanoparticle-based devices. Furthermore, the conductance switching of nanoparticle-based devices upon 530 nm irradiation was attributed to plasmon-induced metal-to-ligand charge transfer in the Ru-terpyridine complexes used as switching ligands. Finally, our results reveal a superior device performance of nanoparticle-based devices compared to molecular wire devices based on Ru-terpyridine complexes as functional units.}, language = {en} } @article{KlenkGalka, author = {Klenk, Eva Marianne and Galka, Stefan}, title = {Analysis of real-time tour building and scheduling strategies for in-plant milk-run systems with volatile transportation demand}, series = {IFAC - PapersOnLine}, volume = {52}, journal = {IFAC - PapersOnLine}, number = {13}, publisher = {Elsevier}, doi = {10.1016/j.ifacol.2019.11.517}, pages = {2110 -- 2115}, abstract = {In modern manufacturing systems, milk run (MR) systems represent route-based, cyclic material-handling systems that are used widely and enable frequent deliveries of containerized parts in small lot sizes from a central storage area to multiple points of use on the factory floor. Usually, deliveries take place at predetermined, constant time intervals. As in real-world MR systems, the number of containers to deliver in each interval varies in the short term, peaks in the number of deliveries may lead to capacity bottlenecks and late deliveries. In this paper, we develop three alternative strategies to determine starting times of MR cycles in real-time based on the current number of delivery orders in the system aiming to better handle variations in the number of orders. We evaluate the three strategies for different system load scenarios with respect to delivery service levels, order lead times, systems utilization and necessary number of MR trains using a discrete-event simulation model.}, language = {en} } @article{GalkaWappler, author = {Galka, Stefan and Wappler, Mona}, title = {Integration of cash flow management and further aspects of the supply chain management in production system design}, series = {IFAC-PapersOnLine}, volume = {56}, journal = {IFAC-PapersOnLine}, number = {2}, publisher = {IFAC / Elsevier}, doi = {10.1016/j.ifacol.2023.10.1687}, pages = {947 -- 952}, abstract = {One major goal of production system design is to decide on space requirements in the plant. In this phase, detailed information about the supply chain network (e.g. which suppliers deliver which parts) is often unavailable. Nevertheless, typical decisions in supply chain management, like the definition of replenishment processes and quantities or make-or-buy decisions, impact space requirements and the capital investment in raw materials. Therefore, it should be considered in factory and production planning. This research article proposes a simulation approach for a production simulation in which raw material replenishment is integrated to evaluate the capital investment and space requirements for raw materials.}, language = {en} } @inproceedings{GalkaSchmid, author = {Galka, Stefan and Schmid, Florian}, title = {Initialization of Simulation-Based Digital Twins for Internal Transport Systems}, series = {IFAC-PapersOnLine}, volume = {58}, booktitle = {IFAC-PapersOnLine}, number = {19}, editor = {Schlund, Sebastian and Ansari, Fazel}, address = {Wien}, organization = {International Federation of Automatic Control (IFAC)}, issn = {2405-8963}, doi = {10.1016/j.ifacol.2024.09.127}, pages = {1084 -- 1089}, abstract = {To support operational decisions using simulation-based digital twins, it is crucial to synchronize the simulation model quickly and accurately with the load state in the real system. This minimizes the typical transient behavior of material flow simulations to a short period of time. This paper presents a concept for initializing a simulation model using the example of a distribution center that uses SAP EWM as a warehouse management system. As part of a study, the influence of the presented initialization concept on the simulation models' transient behavior is investigated. The simulation model used as a reference is in an 'empty' load state at the beginning of the simulation. The study results indicate that the proposed approach can significantly shorten the transient behavior.}, language = {en} } @inproceedings{SchuheggerArmbrusterGalka, author = {Schuhegger, Lukas and Armbruster, Thomas and Galka, Stefan}, title = {Factory Data Model for Planning Variant Sequences, Expansion Stages and Reconfigurations}, series = {IFAC-PapersOnLine}, volume = {56}, booktitle = {IFAC-PapersOnLine}, number = {2}, publisher = {IFAC / Elsevier}, doi = {10.1016/j.ifacol.2023.10.1573}, pages = {227 -- 232}, abstract = {A factory has to adapt to a future production program and increasing volumes. The planning of new factories must therefore already take expansion stages and reconfigurations into account. This leads to an increase in the complexity of planning, as different variants have to be planned and put into a chronologically reasonable and cost-optimized sequence. A factory data model that covers expansion stages manages the planning data amount and reduces complexity. Based on existing models from the literature, a factory data model was developed and modeled in the Unified Modeling Language standard. The factory data model shows which classes are interdependent and how planning results are stored reusable for other variants. An example is used to explain the developed factory data model and highlighting its advantages. The aim is to enable factory planners to document variant sequences and expansion stages in a comprehensible way, which supports the interdisciplinarity of factory planning projects.}, language = {en} } @inproceedings{RolfReggelinLangetal., author = {Rolf, Benjamin and Reggelin, Tobias and Lang, Sebastian and Galka, Stefan}, title = {Developing a Decision Support System for Integrated Decision-Making in Purchasing and Scheduling under Lead Time Uncertainty}, series = {Proceedings of the 55th Hawaii International Conference on System Sciences (HICSS55): January 3-7, 2022, Maui, Hawaii, USA}, volume = {2022}, booktitle = {Proceedings of the 55th Hawaii International Conference on System Sciences (HICSS55): January 3-7, 2022, Maui, Hawaii, USA}, doi = {10.24251/HICSS.2022.247}, pages = {1964 -- 1973}, abstract = {Decision-making in supply chain management is complex because of the relations between planning tasks from different stages and planning levels. Uncertainties such as unpredictable supplier lead times and supply chain disruptions further complicate decision-making. Considering the case study of a company in printed circuit board assembly, a three-level concept is proposed that includes a decision support system. The global single-source supply network is characterized by highly variable lead times. Hence, the company maintains high inventory levels to prevent running out of stock. The decision support system considers the purchasing and scheduling decision problems in an integrated way. The prototypical implementation of the purchasing algorithm uses a genetic algorithm that recommends reorder days and order quantities using a simulation model. In addition, it evaluates the risks of the recommended solution by calculating the probability of stockouts for each order cycle.}, language = {en} } @article{GensleinHauslerKirchneretal., author = {Genslein, Christa and Hausler, Peter and Kirchner, Eva-Maria and Bierl, Rudolf and Baeumner, Antje J. and Hirsch, Thomas}, title = {Graphene-enhanced plasmonic nanohole arrays for environmental sensing in aqueous samples}, series = {Beilstein Journal of Nanotechnology}, journal = {Beilstein Journal of Nanotechnology}, number = {7}, doi = {10.3762/bjnano.7.150}, url = {http://nbn-resolving.de/urn:nbn:de:bvb:355-epub-398623}, pages = {1564 -- 1573}, abstract = {The label-free nature of surface plasmon resonance techniques (SPR) enables a fast, specific, and sensitive analysis of molecular interactions. However, detection of highly diluted concentrations and small molecules is still challenging. It is shown here that in contrast to continuous gold films, gold nanohole arrays can significantly improve the performance of SPR devices in angle-dependent measurement mode, as a signal amplification arises from localized surface plasmons at the nanostructures. This leads consequently to an increased sensing capability of molecules bound to the nanohole array surface. Furthermore, a reduced graphene oxide (rGO) sensor surface was layered over the nanohole array. Reduced graphene oxide is a 2D nanomaterial consisting of sp2-hybridized carbon atoms and is an attractive receptor surface for SPR as it omits any bulk phase and therefore allows fast response times. In fact, it was found that nanohole arrays demonstrated a higher shift in the resonance angle of 250-380\% compared to a continuous gold film. At the same time the nanohole array structure as characterized by its diameter-to-periodicity ratio had minimal influence on the binding capacity of the sensor surface. As a simple and environmentally highly relevant model, binding of the plasticizer diethyl phthalate (DEP) via π-stacking was monitored on the rGO gold nanohole array realizing a limit of detection of as low as 20 nM. The concentration-dependent signal change was studied with the best performing rGO-modified nanohole arrays. Compared to continuous gold films a diameter-to-periodicity ratio (D/P) of 0.43 lead to a 12-fold signal enhancement. Finally, the effect of environmental waters on the sensor was evaluated using samples from sea, lake and river waters spiked with analytically relevant amounts of DEP during which significant changes in the SPR signal are observed. It is expected that this concept can be successfully transferred to enhance the sensitivity in SPR sensors.}, language = {en} } @article{KopperKlotzWestneretal., author = {Kopper, Andreas and Klotz, Stefan and Westner, Markus and Strahringer, Susanne}, title = {Shadow IT and Business-managed IT}, series = {Journal of Information Technology Management (JITM)}, volume = {30}, journal = {Journal of Information Technology Management (JITM)}, number = {4}, issn = {1042-1319}, pages = {25}, abstract = {Two concepts describe the autonomous deployment of IT by business entities: Shadow IT and Business-managed IT. Shadow IT is deployed covertly, that is, software, hardware, or IT services created/procured or managed by business entities without alignment with the IT organization. In contrast, Business-managed IT describes the overt deployment of IT, that is, in alignment with the IT organization or in a split responsibility model. The purpose of this paper is to extend the conceptual understanding of Shadow IT and Business-managed IT, comparing the perceptions of 29 CIOs and senior IT managers with the results of a systematic literature review. By doing so, this paper presents a structured and comprehensive view of causing factors, outcomes, and governance of Shadow IT and Business-managed IT in practice. A comparison of academic literature and practitioner perceptions reveals the limitations and gaps of the current research and highlights avenues for future research. The authors find three category-spanning themes occurring as causing factors, outcomes, and—as part of governance measures—factors to improve the IT organization: (1) (Poor) business-IT alignment (2) (lack of) agility, and (3) (lack of) policies. This study is innovative with its comprehensive qualitative interview data that the authors compare to the existing literature. Therefore, the paper brings together theoretical and practical insights into Shadow IT and Businessmanaged IT, which should aid practitioners and scholars in decision making and future research.}, subject = {Corporate Governance}, language = {en} } @article{KlotzKopperWestneretal., author = {Klotz, Stefan and Kopper, Andreas and Westner, Markus and Strahringer, Susanne}, title = {Causing factors, outcomes, and governance of Shadow IT and business-managed IT}, series = {International Journal of Information Systems and Project Management}, volume = {7}, journal = {International Journal of Information Systems and Project Management}, number = {1}, issn = {2182-7796}, doi = {10.12821/ijispm070102}, pages = {15 -- 43}, abstract = {Shadow IT and Business-managed IT describe the autonomous deployment/procurement or management of Information Technology (IT) instances, i.e., software, hardware, or IT services, by business entities. For Shadow IT, this happens covertly, i.e., without alignment with the IT organization; for Business-managed IT this happens overtly, i.e., in alignment with the IT organization or in a split responsibility model. We conduct a systematic literature review and structure the identified research themes in a framework of causing factors, outcomes, and governance. As causing factors, we identify enablers, motivators, and missing barriers. Outcomes can be benefits as well as risks/shortcomings of Shadow IT and Business-managed IT. Concerning governance, we distinguish two subcategories: general governance for Shadow IT and Business-managed IT and instance governance for overt Business-managed IT. Thus, a specific set of governance approaches exists for Business-managed IT that cannot be applied to Shadow IT due to its covert nature. Hence, we extend the existing conceptual understanding and allocate research themes to Shadow IT, Business-managed IT, or both concepts and particularly distinguish the governance of the two concepts. Besides, we find that governance themes have been the primary research focus since 2016, whereas older publications (until 2015) focused on causing factors.}, subject = {Betriebliches Informationssystem}, language = {en} }