openHSU – Research Showcase

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35
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  • Publication
    Open Access
    Weiterbildung im Fokus!
    (Helmut-Schmidt-Universität / Universität der Bundeswehr Hamburg, Bibliothek, 2024-07-17) ; ; ;
    Zok, Paula
    "Warum nehmen bildungsferne Zielgruppen bzw. weiterbildungsbenachteiligte Personen nur selten oder häufig gar nicht an Weiterbildung teil?“ So lautet die Forschungsfrage einer Hamburger Regionalstudie (Laufzeit Mai 2021 bis März 2024), deren zentralen Erkenntnisse in der Handreichung präsentiert werden. Seit langem ist in der Adressaten-, Zielgruppen- und Teilnehmendenforschung der Erwachsenenbildung/Weiterbildung bekannt, dass längst nicht alle Menschen den gesellschaftlichen Erwartungen des lebenslangen Lernens nachkommen (können). Unterschiede im Teilnahmeverhalten zeigen sich aufgrund von Faktoren wie Bildungsstand, Milieuzugehörigkeit, berufliche Tätigkeit, Geschlecht, Alter und Migrationsgeschichte. Doch die Fokussierung auf soziodemographische Faktoren allein reicht nicht aus, um individuelles Teilnahmeverhalten hinreichend begründen zu können. Weitere strukturelle, organisatorische und subjektive Aspekte sowie deren vielfältigen Verschränkungen können eine nicht zu unterschätzende einschränkende wie auch förderliche Rolle hinsichtlich individueller Entscheidungen für die (Nicht-)Teilnahme an formaler Weiterbildung spielen. Dies zeigen eindrücklich die Ergebnisse dieser regionalen Studie. Die Studie beruht auf einem qualitativ-explorativen, subjektwissenschaftlich orientierten Forschungsdesign. Für eine stärkere Rückbindung in das Praxisfeld der Weiterbildung und Bildungsberatung wurden vorläufige empirische Ergebnisse Betroffenen wie Expertinnen und Experten der Praxis rückgespiegelt und diskutiert. Gemeinsam wurden theoretisch begründete, praxisorientierte Handlungsempfehlungen erarbeitet. Die Handreichung umfasst im ersten Teil einen Überblick zum wissenschaftlichen Kontext der Studie, zu bildungspolitischen Zielsetzungen und zum Stand der Adressaten-, Zielgruppen- und Teilnehmerforschung der Erwachsenenbildung. Teil zwei beinhaltet Darlegungen zum Forschungsvorgehen sowie die Präsentation der zentralen Forschungsergebnisse und -erkenntnisse. Im dritten Teil folgen Ableitungen für die Praxis, die sich auf verschiedene Handlungsbereiche und -arenen der Weiterbildungsarbeit mit benachteiligten Zielgruppen beziehen. Sie beinhalten Vorschläge und Ideen sowie theoriegeleitete Reflexionsbezüge für ein professionelles Handeln auf der Mikro- und Mesoebene.
  • Publication
    Metadata only
    Possible alleviation of symptoms and side effects through clinicians’ nocebo information and empathy in an experimental video vignette study
    (2022-09-27)
    Meijers, M. C.
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    Stouthard, J.
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    Evers, A. W. M.
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    Das, E.
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    Drooger, H. J.
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    Jansen, S. J. A. J.
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    Francke, A. L.
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    Plum, N.
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    van der Wall, E.
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    Nestoriuc, Yvonne 
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    Dusseldorp, E.
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    van Vliet, L. M.
    To alleviate anti-cancer treatment burden in advanced breast cancer, patient-clinician communication strategies based on nocebo-effect mechanisms are promising. We assessed distinct/combined effects on psychological outcomes (e.g. anxiety; main outcome) and side-effect expectations of (1) nocebo information about the (non)pharmacological origin of side effects, and (2) clinician-expressed empathy through reassurance of continuing support. Furthermore, we explored whether information and empathy effects on side-effect expectations were mediated by decreased anxiety. In a two-by-two experimental video-vignette design, 160 cancer patients/survivors and healthy women watched one of four videos differing in level of nocebo information (±) and empathy (±). Regression and mediation analysis were used to determine effects of information/empathy and explore anxiety’s mediating role. Anxiety was not influenced by empathy or information (Stai-state: p = 0.295; p = 0.390, VAS p = 0.399; p = 0.823). Information improved (specific) side-effect coping expectations (p < 0.01). Empathy improved side-effect intensity expectations (p < 0.01 = specific; p < 0.05 = non-specific/partial) and specific side-effect probability expectations (p < 0.01), and increased satisfaction, trust, and self-efficacy (p < 0.001). No mediating effects were found of anxiety on expectations. Mainly empathy, but also nocebo information improved psychological outcomes and—mainly specific—side-effect expectations. Exploring the power of these communication elements in clinical practice is essential to diminish the anti-cancer treatment burden in advanced breast cancer.
  • Publication
    Metadata only
    Residential load modeling for energy application and integration studies in the framework of smart meter gateways
    (VDE Verlag, 2020-12-01)
    Heider, Felix
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    ; ;
    With the implementation of a high secure communication infrastructure in Germany above the low voltage grid the integration of a wide spectrum of energy applications is conceivable, but not easily testable. The lack of a fundamental model, depicting the properties of the Smart Meter Gateway (SMGW) as the central communication device leads to integration studies with possible variations in the basic assumptions and their comparability. The aim of this paper is the development of a modeling approach that can accurately capture the SMGw properties and the challenges of the utilities and companies under various conditions. The developed methodology can be applied to several grid-compliant or market-oriented engineering questions and their potential for new business models through, e.g. switch-off flexibility communication, utilizing the SMGw as additional signal and data exchange layer of the future grid.
  • Publication
    Metadata only
    Determination of a frequency-dependent transformer model through grid impedance measurements
    In this work, a frequency-dependent transformer model is derived with the help of a measurement device that determines the frequency response of the grid impedance at an arbitrary point of connection to the power grid. In this case, the measurement device was connected to a 20 kV medium voltage grid of a wind farm. The disconnection and reconnection of the wind turbine’s transformers revealed the impact the open circuit input impedance of the transformers has on the positive sequence component of the grid impedance. First deriving a positive sequence grid model from the measurement without the transformers, later analyzing the impact the transformers have on the grid impedance, allowed the calculation of the positive sequence component of a frequency-dependent open circuit transformer model, which results in the same impact on the overall grid impedance as observed in the measurements.
  • Publication
    Metadata only
    Short-circuit behavior of a PEM fuel cell stack under various operating conditions
    Optimized grid integration of proton exchange membrane fuel cells in various possible applications requires a suitable protection system. For this reason, this paper examines the transient behavior of a fuel cell stack after an external electrical shortening. In order to show the influence of operating parameters on the short-circuit behavior, various experiments with changed anode and cathode humidity, cell temperature and anode and cathode stoichiometry are carried out. With this, manufacturers can estimate the short-circuit magnitude of their stacks and recommend a suitable plant protection system. It could be shown that the peak short-circuit current depends on the operating point as well as the operating conditions. For the steady-state short-circuit current, the gas stoichiometry has an impact on the deliverable current. For all other operating conditions the steady-state short-circuit current is approximately twice the recommended maximum operating current. Furthermore, a method to estimate the effective fuel cell stack capacity out of the transient short-circuit current is presented.
  • Publication
    Metadata only
    Reliability analysis of large-scale electric bus depots based on different failure scenarios
    In order to decrease the harmful emissions of diesel buses, the senate of Hamburg has decided to allow buying only emission free buses by 2020. The two transportation companies in Hamburg; the Hamburger HOCHBAHN AG and Verkehrsbetriebe Hamburg-Holstein GmbH (VHH) are therefore converting their diesel bus depots to electric ones. Total of eight electrical bus depots are planned to be built during the upcoming years in Hamburg. Those bus depots should be able to serve approximately a total of 1500 buses by 2030. The transportation field is critical for every city due its daily usage. This paper analyzes the cases of having different failure scenarios in the components of the charging infrastructure and their effect on the charging processes of the buses. Additionally the contribution of this paper is to show the effects of the failure scenarios on the routes assigned to the concerned buses. In one of the bus depots, a second-life battery is implemented to the system. In the other bus depot, a 5 MW emergency connection is simulated. Both have the target of decreasing the severity of the situation. For this purpose many charging scenarios are considered to simulate these effects at diverse operational conditions. As a conclusion, the degree of severity of each case is presented based on the failures consequences.
  • Publication
    Metadata only
  • Publication
    Open Access
    Reproduktion von komfortrelevanten Beschleunigungen aus Einzelhindernisüberfahrten in einem Simulator
    (UB HSU, 2024-07-15)
    Reichel, Kevin
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    Helmut-Schmidt-Universität / Universität der Bundeswehr Hamburg
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  • Publication
    Metadata only
    What helps, what hinders antidepressant discontinuation? Qualitative analysis of patients’ experiences and expectations
    (Royal College of General Practitioners, 2024-06-27)
    Meißner, Carina
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    Nestoriuc, Yvonne 
    Background: Many patients with depressive disorders use antidepressants longer than clinically indicated. Long-term use is associated with high individual and societal costs. Patients often perceive antidepressant discontinuation as challenging. Aim: To understand patients’ expectations towards discontinuation, document their experiences with long-term use and discontinuation, and identify factors that can help or hinder discontinuation. Design and Setting: Qualitative study using semi-structured interviews via telephone with adult patients in Germany. Method: Thirty-two patients with remitted Major Depressive Disorder and long-term antidepressant use were interviewed. We analysed transcripts with content analysis aided by MaxQDA to derive thematic categories. Results: Patients expected to eliminate side effects or regain independence following discontinuation. Such positive expectations were perceived as facilitators and motivated patients’ discontinuation wish. However, patients also had negative expectations such as recurrence or discontinuation symptoms. Patients’ negative expectations were often fuelled by negative experiences, persisted despite a wish to stop antidepressants, and hindered discontinuation. Most patients perceived antidepressants as effective, but experienced side effects and further hassles. Patients felt inadequately informed about treatment duration and methods for discontinuation. Further barriers and facilitators included a stable environment, availability of support, and treatment information. Conclusion: Patients prefer to discontinue antidepressants within structured frameworks that provide information and support. Identified facilitators and barriers may help optimise appropriate use and discontinuation of antidepressants in routine practice. The utility of functional expectations and specification of individualised approaches to minimise dysfunctional expectations, adapted to patients’ previous experiences, appear to be especially important.