Publikationen

2020

• Determining the Load Inertia Contribution from Different Power Consumer Groups

  Thiesen, H. ., & Jauch, C. . (2020). Determining the Load Inertia Contribution from Different Power Consumer Groups. Energies, 13(7). http://doi.org/10.3390/en13071588 (Original work published April 2020)

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  Power system inertia is a vital part of power system stability. The inertia response within the first seconds after a power imbalance reduces the velocity of which the grid frequency changes. At present, large shares of power system inertia are provided by synchronously rotating masses of conventional power plants. A minor part of power system inertia is supplied by power consumers. The energy system transformation results in an overall decreasing amount of power system inertia. Hence, inertia has to be provided synthetically in future power systems. In depth knowledge about the amount of inertia provided by power consumers is very important for a future application of units supplying synthetic inertia. It strongly promotes the technical efficiency and cost effective application. A blackout in the city of Flensburg allows for a detailed research on the inertia contribution from power consumers. Therefore, power consumer categories are introduced and the inertia contribution is calculated for each category. Overall, the inertia constant for different power consumers is in the range of 0.09 to 4.24 s if inertia constant calculations are based on the power demand. If inertia constant calculations are based on the apparent generator power, the load inertia constant is in the range of 0.01 to 0.19 s.

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    • Thiesen, Henning
    • Jauch, Clemens

  • Abteilung/Einrichtung

    • Wind Energy Technology Institute

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  • 2020
  • Journal Article
  • • Henning Thiesen
    • Prof. Dr. Clemens Jauch

• Simulation of scattered radiation during intraoperative imaging in a virtual reality learning environment

  Süncksen, M. ., Bott, O. ., Dresing, K. ., & Teistler, M. . (2020). Simulation of scattered radiation during intraoperative imaging in a virtual reality learning environment. International Journal of Computer Assisted Radiology and Surgery , 15, 691–701. http://doi.org/10.1007/s11548-020-02126-x (Original work published April 2020)

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  Purpose Scattered radiation, which occurs when using a C-arm for intraoperative radiography, can be better understood through interactive visualization. We developed a virtual reality (VR) approach for the simulation of scattered radiation (SSR) as part of a C-arm training system. In VR, it is important to avoid cyber sickness, which is often caused by increased latency between head motion and image presentation inside the head-mounted display. As the latency requirement interferes with the computational complexity of the SSR, the goal has been to maintain a low latency during the simultaneous computation of the SSR on moderate-cost consumer hardware. Methods For use with a VR C-arm simulator, a CUDA-based Monte Carlo SSR has been improved to utilize GPU resources unused by the VR image generation. Resulting SSR data are visualized through volume rendering with pseudo-colored scattered radiation superimposed onto the virtual operating room. The resulting interactive VR–SSR environment was evaluated with operating room personnel (ORP) and surgeons using questionnaires. Results Depending on the imaged body part and computation parameters, the required computation time to complete one SSR run was between 1.6 and 4.2 s (ankle) and between 7.9 and 14.9 s (thigh), and VR frame times from 11 to 12 ms (95th percentile). The system was evaluated with ORP (n = 46) and surgeons (n = 25). The median of professional C-arm experience was 5 (range 1 to 34) years (ORP) and 12.5 (range 2 to 48) years (surgeons), respectively. The demonstrated prototype was found useful by 78% of ORP and 88% of the surgeons. On a Likert scale, more than 90% of both groups “agreed fully” that the presented way of visualizing SSR in VR helps understanding intraoperative exposure to scattered radiation. Conclusions Leveraging off-the-shelf computer equipment, the feasibility of SSR and VR for interactive training has been demonstrated. Evaluation participants showed a high interest for the presented approach. Feedback suggests that the visualization experienced by the users helps understanding radiation hazards in the operating room.

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    • Teistler, Michael

  • Forschungsprojekt

    • Computerbasierte Ausbildung in der Medizinischen Bildgebung durch virtuelle und spielbasierte Lernumgebungen

  • Abteilung/Einrichtung

    • CIVU – Center for Interaction, Visualization and Usability

  • Profilbereich

    • Informatik und Gestaltung

  • Forschungsfeld

    • Digitalisierung im Gesundheitswesen
    • Human-Computer-Interaction

  • Fachbereich

    • Fachbereich 3: Information und Kommunikation

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  • 2020
  • Journal Article
  • • Matthias Süncksen
    • Oliver Bott
    • Klaus Dresing
    • Michael Teistler

• Not up to Standard! Creating a Global Assessment Framework and Universal Proficiency Test for Maritime English.

  Noble, A. ., Van Son, L. ., & John, P. . (2020). Not up to Standard! Creating a Global Assessment Framework and Universal Proficiency Test for Maritime English. In Strategies and Analyses of Language and Communication in Multilingual and International Contexts (S. 10). Cambridge (UK): Cambridge Scholars Publishing. Abgerufen von https://www.cambridgescholars.com/product/978-1-5275-4324-9 (Original work published Februar 2020)

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    • John, Peter

  • Fachbereich

    • Fachbereich 3: Information und Kommunikation

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  • 2020
  • Book Chapter
  • • Alison Noble
    • Ludwina Van Son
    • Peter John

• Untersuchung von opensource Datenbanksystemen auf Härtungsmaßnahmen unter Betrachtung des BSI IT-Grundschutz-Kompendium

  Bendig, H. . (2020). Untersuchung von opensource Datenbanksystemen auf Härtungsmaßnahmen unter Betrachtung des BSI IT-Grundschutz-Kompendium. Wismar University of Applied Sciences. Abgerufen von https://it-forensik.fiw.hs-wismar.de/index.php/Henner_Bendig

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  Die Relevanz von Opensource Software (OSS) steigt immer weiter an. Laut einer Studie der Bitkom setzen heutzutage 69% aller Unternehmen, bewusst OSS ein und bis zu 75% der Unternehmen planen OSS einzusetzen [1]. Gleichzeitig steigt die Gefahr von Angriffen auf moderne Technologien [2]. Datenbanksysteme (DBS) stehen heute schon auf Platz 4 der am häufigsten angegriffenen IT-Systeme [3]. Die Wichtigkeit von Daten im heutigen Zeitalter steigt noch immer weiter man, somit ist eine noch höhere Angriffswahrscheinlichkeit auf DBS wahrscheinlich. In dieser Arbeit wurde die Umsetzbarkeit des Bausteins „APP.4.3 – Relationale Datenbanken“ des IT-Grundschutzkompendium der Bundesagentur für Sicherheit in der Informationstechnik (BSI) in den Opensource DBS Oracle MySQL, PostgreSQL und MongoDB untersucht. Die drei gewählten Systeme sind die derzeit am meist verbreiteten Opensource Datenbanksysteme und bedürfen daher erhöhte Aufmerksamkeit [4] [5]. Organisatorische Maßnahmen wurden anhand von Empfehlungen, Vorgaben und Beispielen erarbeitet. Technische Maßnahmen wurden nach Möglichkeit direkt in den DBS umgesetzt. Sofern keine interne Umsetzung notwendig war, wurden Opensource Erweiterungen von Drittanbietern gesucht und getestet. Anhand der vom BSI bereitgestellten Auditorencheckliste wurden die Maßnahmen bewertet. Organisatorische Maßnahmen wurden aus der Wertung herausgenommen. Es wurden die Punktekategorien 0 für gar nicht umsetzbar, 1 für teilweise umsetzbar und 2 für komplett umsetzbar vergeben. MySQL erreichte 73% der möglichen Punkte, PostgreSQL 67% und MongoDB 47%. Ein Großteil der notwendigen Funktionen wird vom Originalhersteller zwar bereitgestellt aber ist nur in der kommerziell verfügbaren Variante der Systeme aktivierbar. Abstract: The relevance of Open Source Software (OSS) is constantly increasing. According to a study by Bitkom, 69% of all companies today use OSS consciously and up to 75% of companies plan to use OSS [1]. At the same time the danger of attacks on modern technologies is increasing [2]. Database systems (DBS) are already in 4th place among the most frequently attacked IT systems [3]. The importance of data in today s age is still increasing, so an even higher probability of attack on DBS is likely. In this thesis the feasibility of the module ‚APP.4.3 - Relational Databases‘ of the IT basic protection compendium of the German Federal Agency for Information Security (BSI) was examined in the open source DBS Oracle MySQL, PostgreSQL and MongoDB. The three chosen systems are currently the most widespread open source database systems and therefore require special attention [4] [5]. Organisational requirements were developed on the basis of recommendations, specifications and examples. Where possible, technical requirements were implemented directly in the DBS. As far as no internal implementation was possible, open source extensions of third-party providers were searched and tested. The requirements were evaluated using the auditor checklist provided by the BSI. Organizational requirements were removed from the evaluation. The point categories 0 for not realizable at all, 1 for partially realizable and 2 for completely realizable were assigned. MySQL achieved 73% of the possible points, PostgreSQL 67% and MongoDB 47%. Most of the required functions are provided by the original manufacturer but can only be activated in the commercially available version of the systems.

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    • Bendig, Henner

  • Forschungsfeld

    • IT-Security

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  • 2020
  • Miscellaneous
  • • Henner Bendig

• Much Ado About Little: A Critical Review of the Employer Branding Concept

  Behrends, T. ., Baur, M. ., & Zierke, L. . (2020). Much Ado About Little: A Critical Review of the Employer Branding Concept. In (S. 1–30). Baden-Baden: Nomos Verlagsgesellschaft mbH & Co. KG. http://doi.org/10.5771/0935-9915-2020-1-1

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  Within the past ten to fifteen years the concept of Employer Branding (EB) has established itself as a widely known and highly regarded concept especially among Human Resource Management practitioners. In many organizations the development, implementation and communication of a distinctive and unique employer brand is meanwhile considered an important building block for gaining a competitive advantage in the so called “war for talent”. The paper at hand aims at critically exploring the conceptual foundations of employer branding by reviewing an extensive body of EB-literature consisting of standard references, scientific journal articles, textbooks as well as practitioner-oriented literature. This review reveals several general weaknesses, discrepancies and “blind spots” which cannot simply be attributed to some few single publications but rather call for a skeptical look upon the whole concept of employer branding itself. In conclusion the authors assert that the employer branding concept widely lacks innovative novelty as well as content-related persuasiveness. It should therefore be regarded as neither more nor less than a contemporary remake of what is and has for quite some time been well known as “Internal Marketing” or “HR Marketing”.

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    • Jackstädt-Zentrum Flensburg (JZF)

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  • 2020
  • Book Chapter
  • • Thomas Behrends
    • Maren Baur
    • Larissa Zierke

• C++ für Dummies

  Willemer, A. . (2020). C++ für Dummies (S. 464). Weinheim: Wiley-VCH.

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    • Willemer, Arnold

  • Fachbereich

    • Fachbereich 3: Information und Kommunikation

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  • 2020
  • Book
  • • Arnold Willemer

• Preferences for Wealth Taxation - Design, Framing and the Role of Partisanship

  Chirvi, M. ., & Schneider, C. . (2020). Preferences for Wealth Taxation - Design, Framing and the Role of Partisanship. arqus Discussion Paper.

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  Empirical literature on preferences for wealth taxation almost exclusively focuses on either the emotionally loaded estate tax or rather general concepts of redistributive preferences. Yet, it remains unclear whether the exceptional opposition towards the estate tax is applicable to other instruments of net wealth taxation. This study presents, to our knowledge, the first investigation of how individuals want to tax wealth-across a variety of tangible wealth tax instruments. In doing so, we particularly test for the presence of framing effects, incidence concentration and the role of wealth characteristics within the different tax configurations. For this, we conducted a factorial vignette survey experiment with over 3,200 respondents on Amazon's Mechanical Turk (MTurk). Each respondent was randomized into one of four burden-equivalent wealth tax instruments: an estate tax, a one-time wealth tax, a decennial wealth tax or a yearly wealth tax. Subsequently we asked each respondent to state her preferred overall lifetime tax burden for a set of hypothetical individuals. Our findings yield several interesting insights. First, we find that the exceptional opposition towards the estate tax is not applicable to other instruments of wealth taxation and is only valid for certain subgroups. In general, our empirical findings provide preferred tax rates between 12.8 to 14.9 percent of overall lifetime tax burden. Second, we document an exceptional opposition towards the mere name "estate tax" in relation to equivalent wealth tax instruments for certain subgroups. Republicans particularly reject the estate tax with a lower proposed effective tax rate of around 3.1 percentage points compared to all other wealth taxes-even the perfectly congruent one-time wealth tax. Third, we uncover the influence of normative preferences for specific design features on the support for a wealth tax. Proposed effective tax rates of the estate tax and the one-time wealth tax show a significant progressivity, whereas no progressivity can be observed for both periodical taxes. The presence of children has an especially significant negative effect in one-off wealth taxes at the end of the lifetime.

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    • Chirvi, Malte

  • Fachbereich

    • Fachbereich 4: Wirtschaft

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  • 2020
  • Unpublished
  • • Malte Chirvi
    • Cornelius Schneider

• Development of a Flexible Lightweight Hydraulic-Pneumatic Flywheel System for Wind Turbine Rotors

  Alhrshy, L. ., Jauch, C. ., & Kloft, P. . (2020). Development of a Flexible Lightweight Hydraulic-Pneumatic Flywheel System for Wind Turbine Rotors. Fluids, 5. http://doi.org/10.3390/fluids5040162

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  In this paper, the design of a flexible piston accumulator for application in a hydraulic-pneumatic flywheel system in a wind turbine rotor is presented. The flywheel system enables a wind turbine to vary the inertia of its rotor blades to control the power output and, most importantly, to influence the vibratory behaviour of wind turbine components. The method used for designing the flexible accumulator is based on the one hand on test results of a flexible piston accumulator prototype, and on the other hand, on simulation results of a model of a flexible piston accumulator. As a result, a design of flexible piston accumulators for application in the flywheel system is implemented and compared with the design of conventional steel accumulators. Due to the proposed design of the flywheel system, the impact on the mechanical loads of a wind turbine is analysed. The simulation results show that the new design of the piston accumulators causes a lower impact on the mechanical loads of the wind turbine than a previously published design of piston accumulators. It is further shown that the considered wind turbine can take on the flywheel system without the need for reinforcements in the rotor blades.

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  • Personenseiten

    • Alhrshy, Laurence
    • Jauch, Clemens

  • Forschungsprojekt

    • Schwungrad

  • Abteilung/Einrichtung

    • Wind Energy Technology Institute

  • Fachbereich

    • Fachbereich 2: Energy and Life Science

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  • 2020
  • Journal Article
  • • Laurence Alhrshy
    • Prof. Dr. Clemens Jauch
    • Peter Kloft

• Genderbezogene Erschließungsprozesse in der Ökonomischen Bildung : zum Forschenden Lernen als Metamethode

  Beckmann, A.-K. ., & Firma>, R. H. <. (2020). Genderbezogene Erschließungsprozesse in der Ökonomischen Bildung : zum Forschenden Lernen als Metamethode. (I. . Ebbers, Hrsg.). 2020: Augsburg : Rainer Hampp Verlag. http://doi.org/10.978.395710/3680 [DOI]

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    • Jackstädt-Zentrum Flensburg (JZF)

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  • 2020
  • Miscellaneous
  • • Ann-Kathrin Beckmann
    • Dr. Rainer Firma>
    • Ilona Ebbers
  • • Ökonomische Bildung
    • Economic education
    • Geschlecht
    • Gender
    • Lernpsychologie
    • Learning psychology
    • Lernen
    • learning
    • Grounded Theory
    • Grounded theory
    • Geschlechterrolle
    • Dichotomie
    • Geschlechter und ihr Verhalten

• First Eigenmodes Simulation Model of a Wind Turbine - for Control Algorithm Design

  Jauch, C. . (2020). First Eigenmodes Simulation Model of a Wind Turbine - for Control Algorithm Design. http://doi.org/10.13140/RG.2.2.17192.19204

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    • Jauch, Clemens

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    • Wind Energy Technology Institute

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  • 2020
  • Report
  • • Prof. Dr. Clemens Jauch
  • • WETI