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 September)

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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

• IEA Wind Task 32: Wind Lidar

  Clifton, A., & Schlipf, D. (2019). IEA Wind Task 32: Wind Lidar. http://doi.org/10.5281/zenodo.3482839 (Original work published oct)

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    • Schlipf, David

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  • 2019
  • Miscellaneous
  • • Andrew Clifton
    • David Schlipf

• Application Level Performance Measurements of Multi-Connectivity Options in Cellular Networks for Vehicular Scenarios

  Lübben, R., & Schwardmann, J. (2019). Application Level Performance Measurements of Multi-Connectivity Options in Cellular Networks for Vehicular Scenarios. In IEEE Local Computer Networks. http://doi.org/10.1109/LCN44214.2019.8990813 (Original work published oct)

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    • Lübben, Ralf

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    • Fachbereich 4: Wirtschaft

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  • 2019
  • Conference Paper
  • • Ralf Lübben
    • Jens Schwardmann

• 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 mar)

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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

• 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 mar)

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    • Schlipf, David

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

• Method and system for contextualizing and targeting inquiries in remote meetings

  Wallbaum, T., Girgensohn, A., Wilcox, L. D., Shipman, F. M., & Susanne, B. O. L. L. -W. E. S. T. E. R. M. A. N. N. (2019). Method and system for contextualizing and targeting inquiries in remote meetings. (Original work published feb # "~5")

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    • Wallbaum, Torben

  • Fachbereich

    • Fachbereich 3: Information und Kommunikation

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  • 2019
  • Miscellaneous
  • • Torben Wallbaum
    • Andreas Girgensohn
    • Lynn Wilcox
    • Frank Shipman III
    • BOLL-WESTERMANN Susanne

• 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., u. 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 feb)

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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

• Set-Point-Fading for Wind Turbine Control

  Schlipf, D. (2019). Set-Point-Fading for Wind Turbine Control. http://doi.org/10.5281/zenodo.5567358 (Original work published dec)

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    • Schlipf, David

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  • 2019
  • Miscellaneous
  • • David Schlipf

• 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 (Original work published 2019/05/01)

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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

  • Fachbereich

    • 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