Publikationen

2019

• Impacts of stakeholder influences and dynamic capabilities on the sustainability performance of supply chains: a system dynamics model

  Rebs, T. ., Thiel, D. ., Brandenburg, M. ., & Seuring, S. . (2019). Impacts of stakeholder influences and dynamic capabilities on the sustainability performance of supply chains: a system dynamics model. Journal of Business Economics, 89, 893–926. http://doi.org/10.1007/s11573-019-00940- (Original work published 2024)

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  Dynamic capabilities (DCs) are crucial for companies to attain competitive advantage in dynamic business environments and supply chains, where environmental and social aspects are considered by sustainable supply chain management (SSCM). However, the effects of stakeholder influences on SSCM performance, which results from the interplay of DCs and SSCM practices, need to be analyzed. Therefore, a system dynamics (SD) model is proposed to include the influences of governmental, shareholder, and other external stakeholder pressure. The system behavior, i.e., the company’s SSCM performance, can thus be analyzed in face of varying time delays of stakeholder influences. Findings indicate that different intensities of stakeholder influences affect the development of SSCM practices and DCs of a focal company, and thus, overall SSCM performance. Consequently, intensities of stakeholder influences should be managed accordingly, while the impact of time delays has to be understood to control SSCM performance. The insights gained from the model support the decision- and policy-making, which can be considered from the perspective of the focal company, the regulatory authorities, the shareholders, and other external stakeholders that ultimately translate into customer pressure.

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    • Brandenburg, Marcus

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  • 2019
  • Journal Article
  • • Tobias Rebs
    • Daniel Thiel
    • Marcus Brandenburg
    • Stefan Seuring
  • • Sustainable supply chain management
    • Stakeholder influences
    • Dynamic capabilities
    • Practices
    • System

• Wind turbine controller to mitigate structural loads on a floating wind turbine platform

  Fleming, P. A., Peiffer, A. ., & Schlipf, D. . (2019). Wind turbine controller to mitigate structural loads on a floating wind turbine platform. Journal of Offshore Mechanics and Arctic Engineering, 141. http://doi.org/10.1115/1.4042938 (Original work published 2024)

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    • Schlipf, David

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  • 2019
  • Journal Article
  • • Paul Fleming
    • Antoine Peiffer
    • David Schlipf

• Integration of Flow Temperatures in Unit Commitment Models of Future District Heating Systems

  Boysen, C. ., Kaldemeyer, C. ., Hilpert, S. ., & Tuschy, I. . (2019). Integration of Flow Temperatures in Unit Commitment Models of Future District Heating Systems. Energies, 12, 1061. http://doi.org/10.3390/en12061061 (Original work published 2024)

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    • Tuschy, Ilja

  • Fachbereich

    • Fachbereich 2: Energy and Life Science

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  • 2019
  • Journal Article
  • • Cynthia Boysen
    • Cord Kaldemeyer
    • Simon Hilpert
    • Ilja Tuschy

• Minute-scale forecasting of wind power results from the collaborative workshop of IEA wind task 32 and 36

  Würth, I. ., Valldecabres, L. ., Simon, E. ., Möhrlen, C. ., Uzunoğlu, B. ., Gilbert, C. ., … Kaifel, A. . (2019). Minute-scale forecasting of wind power results from the collaborative workshop of IEA wind task 32 and 36. Energies, 12, 712. http://doi.org/10.3390/en12040712 (Original work published 2024)

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    • Schlipf, David

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  • 2019
  • Journal Article
  • • Ines Würth
    • Laura Valldecabres
    • Elliot Simon
    • Corinna Möhrlen
    • Bahri Uzunoğlu
    • Ciaran Gilbert
    • Gregor Giebel
    • David Schlipf
    • Anton Kaifel

• Comments on “verifiable outsourced attribute-based signature scheme”

  Uzunkol, O. . (2019). Comments on “verifiable outsourced attribute-based signature scheme”. Multimedia Tools and Applications , 78(9), 11735–11742. http://doi.org/10.1007/s11042-018-6725-7

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  Ren and Jiang recently published a “verifiable outsourced attribute-based signature scheme” in Multimedia Tools and Applications. In this note, we first provide two attacks on the verifiability of the semi-signatures of this scheme by showing that a malicious signing-cloud service provider (S-CSP) can always cheat the signer unlike the authors’ claim. Moreover, one of these attacks also implies that an untrusted S-CSP can always forge signatures contrary to the claimed unforgeability against chosen message attacks. Therefore, this scheme unfortunately does not satisfy the main security properties for a delegated signature scheme.

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    • Uzunkol, Osmanbey

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    • Fachbereich 3: Information und Kommunikation

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  • 2019
  • Journal Article
  • • Osmanbey Uzunkol

• Secure delegation of group exponentiations: Efficient and fully verifiable schemes with two servers

  Moritz, S. ., & Uzunkol, O. . (2019). Secure delegation of group exponentiations: Efficient and fully verifiable schemes with two servers. Security and Privacy, n/a, e70. http://doi.org/https://doi.org/10.1002/spy2.70 (Original work published 2019)

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  Abstract Recent interactions between cloud service providers and mobile resource-constrained devices have increased the interest on the delegation of expensive computations to powerful external server providers. At the same time, security and verifiability of the delegated computation are challenging though highly demanded requirements for various application scenarios. Many security solutions using advanced cryptographic technologies require a large number of highly expensive group exponentiations (GEs). In this paper, we address the problems regarding secure and verifiable delegation of GEs. We first analyze two delegation schemes for GEs both introduced recently in Cluster Computing by Fu et al with the claim that they both provide full verifiability. Particularly, we show that the first scheme is only verifiable with a probability at most 2/3, and the second scheme is totally unverifiable. Then, we propose a secure, efficient and fully verifiable delegation scheme InvDel for a GE using two servers, where one of which is malicious. With InvDel the delegator does not require computations of any group inversions (GIs) while providing full verifiability. Then, we extend InvDel to SimInvDel which is the first, efficient and secure delegation scheme for n-simultaneous GEs achieving full verifiability for n > 1. Secondly, we give implementation results of InvDel and SimInvDel using an Android application together with a comprehensive efficiency analysis of computation and communication with the previous schemes. For instance, when the required CPU costs for a single GE are compared with a 4092-bit modulus, InvDel is more than 220-times (resp. more than two times) more efficient than the local computation (resp. using a previous fully verifiable scheme proposed in the literature). Finally, we also utilize InvDel and SimInvDel to speed-up the verification of Schnorr s signature and Cramer-Shoup encryption schemes.

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    • Uzunkol, Osmanbey

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    • Fachbereich 3: Information und Kommunikation

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  • 2019
  • Journal Article
  • • Stephan Moritz
    • Osmanbey Uzunkol
  • • cloud security
    • lightweight cryptography for mobile security
    • secure delegation
    • verifiable computation

• Vergleich aktueller Patientendatenmanagementsysteme in der Intensivmedizin aus Sicht der klinischen Nutzer

  Suchodolski, K. ., von Dincklage, F. ., Lichtner, G. ., Friesdorf, W. ., Podtschaske, B. ., & Ragaller, M. . (2019). Vergleich aktueller Patientendatenmanagementsysteme in der Intensivmedizin aus Sicht der klinischen Nutzer. Der Anaesthesist, 68(7), 436–443. http://doi.org/10.1007/s00101-019-0615-x (Original work published Juli 2019)

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  Patientendatenmangementsysteme (PDMS) sind computerbasierte Systeme zur Verarbeitung von medizinischen Daten, die auf Intensivstationen sowohl positive als auch negative Einflüsse auf die Patientenversorgung haben können. Die Faktoren, die darüber entscheiden, ob ein PDMS eher Vor- oder Nachteile bringt und wie deutlich diese ausfallen, werden unter dem Begriff „Gebrauchstauglichkeit“ zusammengefasst. Diese Arbeit fasst die Ergebnisse aus 3 bereits publizierten Arbeiten zu diesem Thema zusammen.

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    • Podtschaske, Beatrice

  • Profilbereich

    • Gesundheit und Life Sciences

  • Fachbereich

    • Fachbereich 4: Wirtschaft

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  • 2019
  • Journal Article
  • • Klaudiusz Suchodolski
    • Falk von Dincklage
    • Gregor Lichtner
    • Wolfgang Friesdorf
    • Beatrice Podtschaske
    • Maximilian Ragaller

• Investigation of the Usability of Computerized Critical Care Information Systems in Germany

  von Dincklage, F. ., Suchodolski, K. ., Lichtner, G. ., Friesdorf, W. ., Podtschaske, B. ., & Ragaller, M. . (2019). Investigation of the Usability of Computerized Critical Care Information Systems in Germany. Journal of Intensive Care Medicine, 34(3), 227–237. http://doi.org/10.1177/0885066617696848 (Original work published März 2019)

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  Introduction:The term “usability” describes how effectively, efficiently, and with what level of user satisfaction an information system can be used to accomplish specific goals. Computerized critical care information systems (CCISs) with high usability increase quality of care and staff satisfaction, while reducing medication errors. Conversely, systems lacking usability can interrupt clinical workflow, facilitate errors, and increase charting time. The aim of this study was to investigate and compare usability across CCIS currently used in Germany.Methods:In this study, German intensive care unit (ICU) nurses and physicians completed a specialized, previously validated, web-based questionnaire. The questionnaire assessed CCIS usability based on three rating models: an overall rating of the systems, a model rating technical usability, and a model rating task-specific usability.Results:We analyzed results from 535 survey participants and compared eight different CCIS commonly used in Germany. Our results showed that usability strongly differs across the compared systems. The system ICUData had the best overall rating and technical usability, followed by the platforms ICM and MetaVision. The same three systems performed best in the rating of task-specific usability without significant differences between each other. Across all systems, overall ratings were more dependent on ease-of-use aspects than on aspects of utility/functionality, and the general scope of the functions offered was rated better than how well the functions are realized.Discussion:Our results suggest that manufacturers should shift some of their effort away from the development of new features and focus more on improving the ease-of-use and quality of existing features.

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    • Podtschaske, Beatrice

  • Profilbereich

    • Gesundheit und Life Sciences

  • Fachbereich

    • Fachbereich 4: Wirtschaft

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  • 2019
  • Journal Article
  • • Falk von Dincklage
    • Klaudiusz Suchodolski
    • Gregor Lichtner
    • Wolfgang Friesdorf
    • Beatrice Podtschaske
    • Maximilian Ragaller

• Learning by playing – using computer games to enhance ultrasound education

  Teistler, M. . (2019). Learning by playing – using computer games to enhance ultrasound education. Ultraschall Med, European Journal of Ultrasound, 40, 93–94. http://doi.org/10.1055/a-0833-9381 (Original work published Februar 2019)

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    • Teistler, Michael

  • Abteilung/Einrichtung

    • CIVU – Center for Interaction, Visualization and Usability

  • Fachbereich

    • Fachbereich 3: Information und Kommunikation

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  • 2019
  • Journal Article
  • • Michael Teistler

• Speech acts in professional maritime discourse: A pragmatic risk analysis of bridge team communication directives and commissives in full-mission simulation

  John, P. ., Brooks, B. ., & Schriewer, U. . (2019). Speech acts in professional maritime discourse: A pragmatic risk analysis of bridge team communication directives and commissives in full-mission simulation. Journal of Pragmatics, 140, 10. http://doi.org/https://doi.org/10.1016/j.pragma.2018.11.013 (Original work published Januar 2019)

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  The paper studies verbal maritime communication by categorising spontaneous professional discourse observed in co-operative full-mission simulation exercises into the illocutionary points of commissives and directives according to Searle's original classification. The research adopts a Corpus Pragmatics approach by combining vertical Corpus Linguistics methods with horizontal Pragmatics analyses. Between-group analyses of speech acts by native and non-native speakers of English are carried out and possible risks of miscommunication classified and compared. On the basis of the circular Osgood-Schramm communication model the sender–receiver interaction is investigated for either speaker group. Findings include both quantitative and qualitative between-group differences in locutionary, illocutionary and perlocutionary speech acts. These differences are evaluated as causal factors in effective communicative acts and as contributory factors for miscommunication in the maritime domain.

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    • John, Peter

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    • Fachbereich 3: Information und Kommunikation

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  • 2019
  • Journal Article
  • • Peter John
    • Benjamin Brooks
    • Ulf Schriewer
  • • Maritime team communication
    • Professional discourse
    • Corpus Pragmatics
    • Speech act theory