openHSU – Research Showcase

4492
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108
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31
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  • Publication
    Metadata only
    The effects of hydrocortisone and yohimbine on human behavior in approach-avoidance conflicts
    (2023-06-14)
    Fricke, Kim
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    Alexander, Nina
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    Krug, Henriette
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    Wehkamp, Kai
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    Vogel, Susanne
    Rationale Balancing approach of positive and avoidance of negative stimuli is essential when faced with approach-avoidance conflicts, e.g., situations with both positive and negative outcomes. This balance is disturbed in several mental disorders, e.g., excessive avoidance in anxiety disorders, and heightened approach in substance use disorders. Since stress is assumed to impact these disorders’ etiology and maintenance, it seems crucial to understand how stress influences behavior in approach-avoidance conflicts. Indeed, some studies suggested altered approach-avoidance behavior under acute stress, but the mechanism underlying these effects is unknown. Objectives Investigate how the pharmacological manipulation of major stress mediators (cortisol and noradrenaline) influences task-based approach-avoidance conflict behavior in healthy individuals. Methods Ninety-six participants (48 women, 48 men) received either 20mg hydrocortisone, 20mg yohimbine, both, or placebo before performing a task targeting foraging under predation in a fully crossed double-blind between-subject design. Moreover, we investigated effects of gender and endogenous testosterone and estradiol levels on approach-avoidance behavior. Results While biological stress markers (cortisol concentration, alpha amylase activity) indicated successful pharmacological manipulation, behavior in approach-avoidance conflicts was not affected as expected. Although yohimbine administration affected risky foraging latency under predation, we found no main effect of hydrocortisone or their interaction on behavior. In contrast, we found gender differences for almost all behavioral outcome measures, which might be explained by differences in endogenous testosterone levels. Conclusions The investigated major stress mediators were not sufficient to imitate previously shown stress effects on approach-avoidance conflict behavior. We discuss potential reasons for our findings and implications for future research.
  • Publication
    Open Access
    Governance-Transformationen und neue Formen des Policymaking am Beispiel der Digitalisierung von (schulischer) Bildung in Deutschland
    (UB HSU, 2024)
    Förschler, Lea-Annina
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    Helmut-Schmidt-Universität / Universität der Bundeswehr Hamburg
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    Macgilchrist, Felicitas
  • Publication
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    Where are we heading? Hackathons as a new, relational form of policymaking
    (Routledge, Taylor & Francis, 2024)
    Förschler, Annina
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    Decuypere, Mathias
  • Publication
    Metadata only
    Das "Who is who?" der deutschen Bildungs-Digitalisierungsagenda
    (Budrich, 2018)
    Förschler, Annina
  • Publication
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    P2.13 Korrelation von wiederholten Messungen in einer Modenverwirbelungskammer
    Modenverwirbelungskammern (MVKn) stellen vielfältig verwendbare, reproduzierbare Messumgebungen dar. Grundsätzlich handelt es sich dabei um elektromagnetisch geschirmte Volumina, in denen sog. Modenrührer eingebracht sind, die ein elektromagnetisches Feld „verwirbeln“, sodass ein Prüfling einer definierten aber statistisch variierenden Umgebung ausgesetzt wird. Die Modenrührer in MVKn können schrittweise zwischen den einzelnen Messzeitpunkten oder kontinuierlich verfahren werden. In diesem Beitrag werden die jeweiligen Eigenschaften von wiederholten Messungen, die sowohl bei kontinuierlichem als auch schrittweisem Betrieb der Modenrührer aufgenommen wurden, betrachtet. Mit Hilfe von Korrelationskoeffizenten wird jeweils die Wiederholbarkeit der aufgenommenen Messwertsequenzen insgesamt untersucht. Darüber hinaus wird die Wiederholbarkeit von Fadingeinbrüchen gesondert betrachtet, da diese einen wesentlichen Einfluss auf Funksysteme haben, die mittels einer MVK charakterisiert werden können. Als Ursache für Abweichungen bei Wiederholungen wird abschließend das zeitliche Verhalten bzw. die Streuungen zwischen den Messzeitpunkten betrachtet.
  • Publication
    Metadata only
    IO-Link Wireless enhanced factory automation communication for Industry 4.0 applications
    (Copernicus, 2018-03-06) ;
    Krush, Dmytro
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    ; ;
    Kaercher, Bernd
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    Ritter, Jochen
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    Gaggero, Pascal
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    Rentschler, Markus
    In the context of the Industry 4.0 initiative, Cyber-Physical Production Systems (CPPS) or Cyber Manufacturing Systems (CMS) can be characterized as advanced networked mechatronic production systems gaining their added value by interaction with the ambient Industrial Internet of Things (IIoT). In this context appropriate communication technologies and standards play a vital role to realize the manifold potential improvements in the production process. One of these standards is IO-Link. In 2016 more than 5 million IO-Link nodes have been produced and delivered, still gaining increasing acceptance for the communication between sensors, actuators and the control level. The steadily increasing demand for more flexibility in automation solutions can be fulfilled using wireless technologies. With the wireless extension for the IO-Link standard, which will be presented in this article, maximum cycle times of 5 ms can be achieved with a probability that this limit will be exceeded to be at maximum one part per billion. Also roaming capabilities, wireless coexistence mechanisms and the possibility to include battery-powered or energy-harvesting sensors with very limited energy resources in the realtime network were defined. For system planning, setup, operation and maintenance, the standard engineering tools of IO-Link can be employed so that the backward compatibility with wired IO-Link solutions can be guaranteed. Interoperability between manufacturers is a key requirement for any communication standard, thus a procedure for IO-Link Wireless testing is also suggested.
  • Publication
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    Deep Fading in a Reverberation Chamber for Wireless Device Testing
    Reverberation chambers (RCs) are a feasible option as test environment for evaluation of wireless devices with integrated antenna as they inherently emulate a Rayleigh fading channel. In this paper the dependency of deep fading on the frequency and position/orientation of an equipment under test (EUT) antenna is evaluated for different numbers of RC steps and loading conditions. The measured data were applied to an exemplary standard for wireless communication. The measurement results are highly repeatable and independent of frequency or position/orientation of the EUT and loading conditions.
  • Publication
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    D8.4 Precision Measurement of the Application-dependent Current Consumption of a Wireless Transceiver Chip
    Modern production concepts generate a demand for reliable, fast and secure wireless communication solutions. Therefore, the current consumption should not increase highly due to additional security operations. This paper shows a principle current measurement method exemplarily of a transceiver for IOLink Wireless protocol. The results show that the current consumption increases by about 316 μA when using hardware-based encryption features, whereby an experimental standard deviation of the mean values of about 15 μA was determined.
  • Publication
    Metadata only
    Jetzt kann IO-Link auch funken
    (Beuth Verlag GmbH, 2021-06) ;
    Monaco, Antonio
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