The Experts below are selected from a list of 52497 Experts worldwide ranked by ideXlab platform

Taebok Kim - One of the best experts on this subject based on the ideXlab platform.

  • Coordination strategies in a three-echelon reverse supply chain for economic and social benefit
    Applied Mathematical Modelling, 2017
    Co-Authors: Zhen Wang, Bao Jiang, Taebok Kim
    Abstract:

    Abstract In addition to seeking profit maximization, reverse supply chains should further seek to maximize social benefit. Consequently, this paper investigates the coordination strategies among different parties in a three-echelon reverse supply chain consisting of a single collector, a single remanufacturer, and two retailers with complete information sharing. Additionally, this paper discusses four coordination strategies and performs a detailed comparative analysis on the optimal decisions of different Models. Three numerical analyses are performed to show how the potential market demand of remanufactured products and the utilization ratio of used products affect the optimal total channel profit, recycle quantity and retail prices among four Models in a reverse supply chain. The results indicate that optimal total channel profit and recycle quantity in a reverse supply chain are maximized in a Centralized Model. With the same potential market demand of remanufactured products and utilization ratio of used products, a Centralized Model maximizes the economic and social benefit compared to the other three Models.

Sylvia L. Osborn - One of the best experts on this subject based on the ideXlab platform.

  • Secure Data Management - Conflict of interest in the administrative role graph Model
    Lecture Notes in Computer Science, 2006
    Co-Authors: Yunyu Song, Sylvia L. Osborn
    Abstract:

    The original role graph Model for role-based access control assumed a Centralized administrative Model. Conflict of interest for the Centralized Model was previously discussed by Nyanchama and Osborn. More recently, a deCentralized administrative Model for role graphs has been introduced by Wang and Osborn. This paper investigates how considerations of conflict of interest interact with the deCentralized administrative Model, and the resulting impact on role graph operations.

  • Conflict of interest in the administrative role graph Model
    2006
    Co-Authors: Yunyu Song, Sylvia L. Osborn
    Abstract:

    The original role graph Model for role-based access control assumed a Centralized administrative Model. Conflict of interest for the Centralized Model was previously discussed by Nyanchama and Osborn. More recently, a deCentralized administrative Model for role graphs has been introduced by Wang and Osborn. This paper investigates how considerations of conflict of interest interact with the deCentralized administrative Model, and the resulting impact on role graph operations.

Ralph Kennel - One of the best experts on this subject based on the ideXlab platform.

  • fpga based experimental investigation of a quasi Centralized Model predictive control for back to back converters
    IEEE Transactions on Power Electronics, 2016
    Co-Authors: Zhenbin Zhang, Fengxiang Wang, Tongjing Sun, J Rodriguez, Ralph Kennel
    Abstract:

    Voltage source back-to-back power converters are widely used in grid-tied applications. This paper presents a quasi-Centralized direct Model predictive control (QC-DMPC) scheme for back-to-back converter control without a dc-link outer-loop controller. Furthermore, the QC-DMPC is experimentally compared with a conventional proportional-integration (PI) dc-link controller-based DMPC (PI-DMPC) scheme. For the QC-DMPC scheme, the dc-link voltage is directly controlled by a grid-side predictive controller using a dynamic reference generation concept and load-side power estimation. For the PI-DMPC scheme, the dc-link voltage is controlled by an external PI controller. Both schemes are implemented on a field programmable gate array (FPGA)-based platform. Effectiveness of the proposed QC-DMPC is verified by both simulation and experimental data. Moreover, FPGA implementation issues (resource usage and timing information), dc-link control performance, and robustness to parameter variation of the two DMPC schemes are compared in detail. The results emphasize that the QC-DMPC may outperform the PI-DMPC scheme in normal operation but with a slightly higher usage of FPGA resources. However, PI-DMPC scheme is more robust when parameter variations are considered.

  • fpga based experimental investigation of a quasi Centralized Model predictive control for back to back converters
    IEEE Transactions on Power Electronics, 2016
    Co-Authors: Zhenbi Zhang, Fengxiang Wang, J Rodriguez, Ralph Kennel
    Abstract:

    Voltage source back-to-back power converters are widely used in grid-tied applications. This paper presents a quasi-Centralized direct Model predictive control (QC-DMPC) scheme for back-to-back converter control without a dc-link outer-loop controller. Furthermore, the QC-DMPC is experimentally compared with a conventional proportional-integration (PI) dc-link controller-based DMPC (PI-DMPC) scheme. For the QC-DMPC scheme, the dc-link voltage is directly controlled by a grid-side predictive controller using a dynamic reference generation concept and load-side power estimation. For the PI-DMPC scheme, the dc-link voltage is controlled by an external PI controller. Both schemes are implemented on a field programmable gate array (FPGA)-based platform. Effectiveness of the proposed QC-DMPC is verified by both simulation and experimental data. Moreover, FPGA implementation issues (resource usage and timing information), dc-link control performance, and robustness to parameter variation of the two DMPC schemes are compared in detail. The results emphasize that the QC-DMPC may outperform the PI-DMPC scheme in normal operation but with a slightly higher usage of FPGA resources. However, PI-DMPC scheme is more robust when parameter variations are considered.

Zhen Wang - One of the best experts on this subject based on the ideXlab platform.

  • Coordination strategies in a three-echelon reverse supply chain for economic and social benefit
    Applied Mathematical Modelling, 2017
    Co-Authors: Zhen Wang, Bao Jiang, Taebok Kim
    Abstract:

    Abstract In addition to seeking profit maximization, reverse supply chains should further seek to maximize social benefit. Consequently, this paper investigates the coordination strategies among different parties in a three-echelon reverse supply chain consisting of a single collector, a single remanufacturer, and two retailers with complete information sharing. Additionally, this paper discusses four coordination strategies and performs a detailed comparative analysis on the optimal decisions of different Models. Three numerical analyses are performed to show how the potential market demand of remanufactured products and the utilization ratio of used products affect the optimal total channel profit, recycle quantity and retail prices among four Models in a reverse supply chain. The results indicate that optimal total channel profit and recycle quantity in a reverse supply chain are maximized in a Centralized Model. With the same potential market demand of remanufactured products and utilization ratio of used products, a Centralized Model maximizes the economic and social benefit compared to the other three Models.

Yunyu Song - One of the best experts on this subject based on the ideXlab platform.

  • Secure Data Management - Conflict of interest in the administrative role graph Model
    Lecture Notes in Computer Science, 2006
    Co-Authors: Yunyu Song, Sylvia L. Osborn
    Abstract:

    The original role graph Model for role-based access control assumed a Centralized administrative Model. Conflict of interest for the Centralized Model was previously discussed by Nyanchama and Osborn. More recently, a deCentralized administrative Model for role graphs has been introduced by Wang and Osborn. This paper investigates how considerations of conflict of interest interact with the deCentralized administrative Model, and the resulting impact on role graph operations.

  • Conflict of interest in the administrative role graph Model
    2006
    Co-Authors: Yunyu Song, Sylvia L. Osborn
    Abstract:

    The original role graph Model for role-based access control assumed a Centralized administrative Model. Conflict of interest for the Centralized Model was previously discussed by Nyanchama and Osborn. More recently, a deCentralized administrative Model for role graphs has been introduced by Wang and Osborn. This paper investigates how considerations of conflict of interest interact with the deCentralized administrative Model, and the resulting impact on role graph operations.