The Experts below are selected from a list of 15765 Experts worldwide ranked by ideXlab platform

Sebastian Perk - One of the best experts on this subject based on the ideXlab platform.

  • Nonblocking Hierarchical Control of decentralized DES
    IFAC Proceedings Volumes, 2016
    Co-Authors: Klaus Werner Schmidt, Sebastian Perk, Thomas Moor
    Abstract:

    Abstract This work considers a Hierarchical Control architecture for a class of discrete event systems which can also be applied to decentralized Control systems. It is shown that nonblocking supervisory Control on the high level of the hierarchy results in nonblocking and Hierarchically consistent Control on the low level.

  • Nonblocking Hierarchical Control of Decentralized Discrete Event Systems
    IEEE Transactions on Automatic Control, 2008
    Co-Authors: Klaus Schmidt, Thomas Moor, Sebastian Perk
    Abstract:

    This contribution investigates the Hierarchical Control of decentralized discrete event systems (DES) that are synchronized by shared events. A Hierarchical Control architecture providing Hierarchical consistency is introduced. Moreover, it allows for composition of decentralized subsystems on the high-level of the hierarchy and hence reduces the computational complexity of supervisory Control synthesis for language inclusion specifications. In this context, a crucial issue is the nonblocking operation of the overall system. Our main theorem identifies sufficient conditions for this desirable property.

Bin Liang - One of the best experts on this subject based on the ideXlab platform.

  • ROBIO - Task-oriented Hierarchical Control for a Quadruped Robot
    2019 IEEE International Conference on Robotics and Biomimetics (ROBIO), 2019
    Co-Authors: Linqi Ye, Xueqian Wang, Bo Yuan, Bin Liang
    Abstract:

    This study aims to build a standard framework that can be applied to accomplish different tasks for a quadruped robot. To achieve this goal, a task-oriented Hierarchical Control framework is proposed. The framework is composed of four layers, including the task, action, movement, and joint layer, where the action layer plays a crucial role. An action is defined as a group of movements that take the robot from an initial position/orientation to another position/orientation. All actions form the action library, which can be combined to accomplish different tasks. Based on the Hierarchical Control framework, two tasks including path following and ditch crossing are achieved in this paper. The advantages of the proposed Hierarchical Control framework are its universality and extendibility since it can be easily applied to other tasks by enriching the action library. Simulation results in V-REP are given to validate the effectiveness of the proposed method.

  • Task-oriented Hierarchical Control for a Quadruped Robot
    2019 IEEE International Conference on Robotics and Biomimetics (ROBIO), 2019
    Co-Authors: Linqi Ye, Xueqian Wang, Bo Yuan, Bin Liang
    Abstract:

    This study aims to build a standard framework that can be applied to accomplish different tasks for a quadruped robot. To achieve this goal, a task-oriented Hierarchical Control framework is proposed. The framework is composed of four layers, including the task, action, movement, and joint layer, where the action layer plays a crucial role. An action is defined as a group of movements that take the robot from an initial position/orientation to another position/orientation. All actions form the action library, which can be combined to accomplish different tasks. Based on the Hierarchical Control framework, two tasks including path following and ditch crossing are achieved in this paper. The advantages of the proposed Hierarchical Control framework are its universality and extendibility since it can be easily applied to other tasks by enriching the action library. Simulation results in V-REP are given to validate the effectiveness of the proposed method.

Thomas Moor - One of the best experts on this subject based on the ideXlab platform.

  • Nonblocking Hierarchical Control of decentralized DES
    IFAC Proceedings Volumes, 2016
    Co-Authors: Klaus Werner Schmidt, Sebastian Perk, Thomas Moor
    Abstract:

    Abstract This work considers a Hierarchical Control architecture for a class of discrete event systems which can also be applied to decentralized Control systems. It is shown that nonblocking supervisory Control on the high level of the hierarchy results in nonblocking and Hierarchically consistent Control on the low level.

  • WODES - A Hierarchical Control Architecture for Sequential Behaviours
    IFAC Proceedings Volumes, 2016
    Co-Authors: Christine Baier, Thomas Moor
    Abstract:

    Abstract This paper develops a Hierarchical Control architecture for so called sequential behaviours , i.e. for plant dynamics and specifications that are represented as formal languages of infinite-length words. Our main result is the elaboration of structural properties that (a) allow for abstraction based Controller design and that (b) are preserved under closed-loop composition. Thus, we propose to alternate Controller design, closed-loop composition and abstraction in order to construct a Hierarchical Control system. Technically, our results are based on a variation of input-output systems as introduced by Willems (1991), with a particular focus on liveness properties , i.e., sequential behaviours that are not necessarily topologically closed.

  • Nonblocking Hierarchical Control of Decentralized Discrete Event Systems
    IEEE Transactions on Automatic Control, 2008
    Co-Authors: Klaus Schmidt, Thomas Moor, Sebastian Perk
    Abstract:

    This contribution investigates the Hierarchical Control of decentralized discrete event systems (DES) that are synchronized by shared events. A Hierarchical Control architecture providing Hierarchical consistency is introduced. Moreover, it allows for composition of decentralized subsystems on the high-level of the hierarchy and hence reduces the computational complexity of supervisory Control synthesis for language inclusion specifications. In this context, a crucial issue is the nonblocking operation of the overall system. Our main theorem identifies sufficient conditions for this desirable property.

Yongwang Zhao - One of the best experts on this subject based on the ideXlab platform.

  • DASC - A Web Services Container Supporting QoS Hierarchical Control with Multiple Measurements for Utilization
    2013 IEEE 11th International Conference on Dependable Autonomic and Secure Computing, 2013
    Co-Authors: Zhe Wang, Dianfu Ma, Yongwang Zhao
    Abstract:

    In Service-Oriented Architecture (SOA), web services container demands to support QoS (Quality of Service) Hierarchical Control to provide the optimization of utilization for web services container as well as a guarantee of the QoS requirements of the services. With the spreading of SOA and the improvement of research in web service, the optimization for web services container is changing from solely seeking high performance to balancing utilization on multiple levels. Therefore, web services container needs to support QoS Hierarchical Control based on different measurements of utilization. In order to support QoS Hierarchical Control with multiple measurements of utilization, a representation method of web service QoS Hierarchical Control is proposed, which represents different QoS Hierarchical Control strategies with different measurements for utilization by a single standard. Based on the representation method, we present a QoS Hierarchical Control mixed strategy, which can support QoS Hierarchical Control with multiple measurements for utilization. Using the QoS Hierarchical Control mixed strategy, we realize a web services container. The result of the test shows that the web services container realized can support QoS Hierarchical Control with different measurements for utilization. The utilization of the service container significantly improves when the mixed strategy measures utilization from multiple perspectives, add the performance of which is slightly better than that of other QoS Hierarchical Control strategies that measures utilization from a single perspective.

  • A Web Services Container Supporting QoS Hierarchical Control with Multiple Measurements for Utilization
    2013 IEEE 11th International Conference on Dependable Autonomic and Secure Computing, 2013
    Co-Authors: Zhe Wang, Yongwang Zhao
    Abstract:

    In Service-Oriented Architecture (SOA), web services container demands to support QoS (Quality of Service) Hierarchical Control to provide the optimization of utilization for web services container as well as a guarantee of the QoS requirements of the services. With the spreading of SOA and the improvement of research in web service, the optimization for web services container is changing from solely seeking high performance to balancing utilization on multiple levels. Therefore, web services container needs to support QoS Hierarchical Control based on different measurements of utilization. In order to support QoS Hierarchical Control with multiple measurements of utilization, a representation method of web service QoS Hierarchical Control is proposed, which represents different QoS Hierarchical Control strategies with different measurements for utilization by a single standard. Based on the representation method, we present a QoS Hierarchical Control mixed strategy, which can support QoS Hierarchical Control with multiple measurements for utilization. Using the QoS Hierarchical Control mixed strategy, we realize a web services container. The result of the test shows that the web services container realized can support QoS Hierarchical Control with different measurements for utilization. The utilization of the service container significantly improves when the mixed strategy measures utilization from multiple perspectives, add the performance of which is slightly better than that of other QoS Hierarchical Control strategies that measures utilization from a single perspective.

Peng Zhang - One of the best experts on this subject based on the ideXlab platform.

  • Enhanced Microgrid Power Flow Incorporating Hierarchical Control
    IEEE Transactions on Power Systems, 2020
    Co-Authors: Fei Feng, Peng Zhang
    Abstract:

    An enhanced microgrid power flow (EMPF) is devised to incorporate Hierarchical Control effects. The new contributions are threefold: 1) an advanced-Hierarchical-Control-based Newton approach is established to accurately assess power sharing and voltage regulation effects; 2) a modified Jacobian matrix is derived to incorporate droop Control and various secondary Control modes; and 3) the secondary adjustment is calculated on top of the droop-Control-based power flow results to ensure a robust Newton solution. Case studies validate that EMPF is efficacious and efficient and can serve as a powerful tool for microgrid operation and monitoring, especially for those highly meshed microgrids in urban areas.