The Experts below are selected from a list of 26781 Experts worldwide ranked by ideXlab platform
Won-jong Kim - One of the best experts on this subject based on the ideXlab platform.
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Experimental analysis and implementation of a multiscale wireless/wired Networked Control System
International Journal of Control Automation and Systems, 2014Co-Authors: Jiawei Dong, Won-jong KimAbstract:The aim of this paper is to discuss the flexibility and the performance of a multiscale wireless/wired Networked Control System (NCS). This NCS consists of three different types of dynamic Systems (fast, medium, and slow clients) with distinct time scales. The experimental results verified the capability of the NCS to combine both the wired and wireless networks and the Control capability of the NCS with various sampling periods. Compared to the original wired NCS, the average steady-state error of the fast client increased by 20% to 30% under the same conditions with the wireless NCS within the bandwidth-utilization (BU) threshold. From the analysis, the sampling period together with the BU and the number of clients will determine the time-delay and packet-loss levels and affect the stability and performance of the NCS in a complex correlated manner.
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switched ethernet based real time Networked Control System with multiple client server architecture
IEEE-ASME Transactions on Mechatronics, 2013Co-Authors: N. Bibinagar, Won-jong KimAbstract:This paper experimentally verifies that a multiple-client-server architecture based on switched Ethernet can be used as a real-time communication standard for possible applications in factory automation, by observing the effects of packet delays, network congestion, and packet loss on the performance of a Networked Control System (NCS). The NCS experimental setup used in this research involves real-time feedback Control of multiple plants connected to one or more Controllers over the network. A multiclient-multiserver (MC-MS) architecture on a local area network (LAN) was developed using user datagram protocol as the communication protocol. In the single-client-single-server (SC-SS) System, as the Ethernet link utilization increased over 82%, the average packet delays and steady-state error of a dc motor speed-Control System increased by 2231% and 304%, respectively. As the link utilization increased beyond the threshold, employing an additional server in the NCS reduced average packet delays and also overcame the negative effects of Ethernet's flow Control mechanism. The MC-MS architecture is tested with artificially generated random packet loss. The standard deviation of steady-state error (SSE) at 80% utilization with packet loss is found to be 70.2% less than SC-SS and 200% less than multiclient-single-server architecture. The MC-MS architecture remained stable till 70% of Control or measurement packet loss.
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Switched Ethernet-Based Real-Time Networked Control System with Multiple-Client–Server Architecture
IEEE ASME Transactions on Mechatronics, 2013Co-Authors: N. Bibinagar, Won-jong KimAbstract:This paper experimentally verifies that a multiple-client-server architecture based on switched Ethernet can be used as a real-time communication standard for possible applications in factory automation, by observing the effects of packet delays, network congestion, and packet loss on the performance of a Networked Control System (NCS). The NCS experimental setup used in this research involves real-time feedback Control of multiple plants connected to one or more Controllers over the network. A multiclient-multiserver (MC-MS) architecture on a local area network (LAN) was developed using user datagram protocol as the communication protocol. In the single-client-single-server (SC-SS) System, as the Ethernet link utilization increased over 82%, the average packet delays and steady-state error of a dc motor speed-Control System increased by 2231% and 304%, respectively. As the link utilization increased beyond the threshold, employing an additional server in the NCS reduced average packet delays and also overcame the negative effects of Ethernet's flow Control mechanism. The MC-MS architecture is tested with artificially generated random packet loss. The standard deviation of steady-state error (SSE) at 80% utilization with packet loss is found to be 70.2% less than SC-SS and 200% less than multiclient-single-server architecture. The MC-MS architecture remained stable till 70% of Control or measurement packet loss.
Fang Hua-jing - One of the best experts on this subject based on the ideXlab platform.
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Fault Detection for Networked Control System with Time-varying Sampling Period
Computer Engineering, 2013Co-Authors: Fang Hua-jingAbstract:Aiming the problem that robust fault detection of Networked Control System(NCS) with time-varying sampling period and time delay,the uncertainties of time-varying sampling period and time delay in NCS are converted into the uncertainties of the parameter matrix by the real Jordan form approximation,and a discrete-time model with parameters uncertainties lying inside a polytypic framework is proposed.The residual generator is constructed and the problem of fault detection can be converted into the design of the Robust Fault Detection Filter(RFDF).The sufficient conditions for existence of the RFDF are established in terms of linear matrix inequalities.Simulation result shows the filter can repeat the fault signal well and it is robust for the disturbance and the uncertain sampling interval and time delay.
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Stability Design for Networked Control System with Equality Constraint
Information & Computation, 2007Co-Authors: Fang Hua-jingAbstract:Stability of the Networked Control System(NCS) with equality constraint is studied.On the assumption that the network delay changes randomly and the plant under the Control of the NCS is a time-delay System with equality constraint,the NCS is modeled as a hybrid System.Then,the Lyapunov function and linear matrix inequality(LMI) methods are used to derive a sufficient condition for the asymptotical stability of the hybrid System.With this sufficient condition,by solving linear matrix inequality,the System maximum allowable network-delay and the Controller at this time can be obtained easily.The numerical example and simulation are presented to demonstrate the effectiveness of the proposed design approach.
Yang Guang-hong - One of the best experts on this subject based on the ideXlab platform.
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H_∞ Control of Networked Control System with Time-Varying Sampling Period
Information & Computation, 2007Co-Authors: Yang Guang-hongAbstract:The design problem of robust H∞ Controller for Networked Control System(NCS) with time-varying sampling period is studied.Based on the varying sampling period,a switching method,of which the sampling period switches in a finite set,is proposed to model the NCS with time-varying sampling period,long-time delay and packet dropout as a switched System.With the proposed switching method,a non-convex feasibility problem is formulated into a multi-objective optimization problem subject to LMI(linear matrix equality) constraints,and an H∞ Controller design method for NCS is presented.The simulation results illustrate that the proposed H∞ Controller design method for NCS with sampling period switching is effective.
N. Bibinagar - One of the best experts on this subject based on the ideXlab platform.
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switched ethernet based real time Networked Control System with multiple client server architecture
IEEE-ASME Transactions on Mechatronics, 2013Co-Authors: N. Bibinagar, Won-jong KimAbstract:This paper experimentally verifies that a multiple-client-server architecture based on switched Ethernet can be used as a real-time communication standard for possible applications in factory automation, by observing the effects of packet delays, network congestion, and packet loss on the performance of a Networked Control System (NCS). The NCS experimental setup used in this research involves real-time feedback Control of multiple plants connected to one or more Controllers over the network. A multiclient-multiserver (MC-MS) architecture on a local area network (LAN) was developed using user datagram protocol as the communication protocol. In the single-client-single-server (SC-SS) System, as the Ethernet link utilization increased over 82%, the average packet delays and steady-state error of a dc motor speed-Control System increased by 2231% and 304%, respectively. As the link utilization increased beyond the threshold, employing an additional server in the NCS reduced average packet delays and also overcame the negative effects of Ethernet's flow Control mechanism. The MC-MS architecture is tested with artificially generated random packet loss. The standard deviation of steady-state error (SSE) at 80% utilization with packet loss is found to be 70.2% less than SC-SS and 200% less than multiclient-single-server architecture. The MC-MS architecture remained stable till 70% of Control or measurement packet loss.
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Switched Ethernet-Based Real-Time Networked Control System with Multiple-Client–Server Architecture
IEEE ASME Transactions on Mechatronics, 2013Co-Authors: N. Bibinagar, Won-jong KimAbstract:This paper experimentally verifies that a multiple-client-server architecture based on switched Ethernet can be used as a real-time communication standard for possible applications in factory automation, by observing the effects of packet delays, network congestion, and packet loss on the performance of a Networked Control System (NCS). The NCS experimental setup used in this research involves real-time feedback Control of multiple plants connected to one or more Controllers over the network. A multiclient-multiserver (MC-MS) architecture on a local area network (LAN) was developed using user datagram protocol as the communication protocol. In the single-client-single-server (SC-SS) System, as the Ethernet link utilization increased over 82%, the average packet delays and steady-state error of a dc motor speed-Control System increased by 2231% and 304%, respectively. As the link utilization increased beyond the threshold, employing an additional server in the NCS reduced average packet delays and also overcame the negative effects of Ethernet's flow Control mechanism. The MC-MS architecture is tested with artificially generated random packet loss. The standard deviation of steady-state error (SSE) at 80% utilization with packet loss is found to be 70.2% less than SC-SS and 200% less than multiclient-single-server architecture. The MC-MS architecture remained stable till 70% of Control or measurement packet loss.
Mireille Bayart - One of the best experts on this subject based on the ideXlab platform.
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Attack-Tolerant Networked Control System Based on the Deception for the Cyber-Attacks
2017Co-Authors: Amer Yaseen, Attia A. Yaseen, Mireille BayartAbstract:In this paper, we propose a new security mechanism for Networked Control System, which has the ability to stopping the cyber-attacks. In addition, the proposed mechanism provides the last line of defense when its encryption is broken. This defensive line is called “Attack-Tolerant” and it is based on the deception for the cyber-attacks. The attack-tolerant scheme is able to making the attacker believes that he has achieved the desired goal and as a result, the attacker stops the attack method improvement. Furthermore, there is an indication for the attacks will be included within the sensor reading which will be sent from the remote plant side to the local Controller side. In order to implement the proposed mechanism, a specific algorithm will be designed along with Data Encryption Standard (DES), Message Digest (MD5), timestamp, and the mathematical model of the plant with acceptable limit of uncertainty. The simulation results of the proposed mechanism have been found to be satisfactory.
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Attack-Tolerant Networked Control System Based on the Deception for the Cyber-Attacks
2017Co-Authors: Amer Yaseen, Amer Atta Yaseen, Mireille BayartAbstract:In this paper, we propose a new security mechanism for Networked Control System, which has the ability to stopping the cyber-attacks. In addition, the proposed mechanism provides the last line of defense when its encryption is broken. This defensive line is called “Attack-Tolerant” and it is based on the deception for the cyber-attacks. The attack-tolerant scheme is able to making the attacker believes that he has achieved the desired goal and as a result, the attacker stops the attack method improvement. Furthermore, there is an indication for the attacks will be included within the sensor reading which will be sent from the remote plant side to the local Controller side. In order to implement the proposed mechanism, a specific algorithm will be designed along with Data Encryption Standard (DES), Message Digest (MD5), timestamp, and the mathematical model of the plant with acceptable limit of uncertainty. The simulation results of the proposed mechanism have been found to be satisfactory.
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Attack-tolerant Networked Control System: an approach for detection the Controller stealthy hijacking attack
2016Co-Authors: Amer Yaseen, Mireille BayartAbstract:In this work, a new approach will be introduced as a development for the attack-tolerant scheme in the Networked Control System (NCS). The objective is to be able to detect to an attack such as the Stuxnet case where the Controller is reprogrammed and hijacked. Beside the ability to detect the stealthy Controller hijacking attack. The advantage of this approach is that there is no need for a priori mathematical model of the Controller. In order to implement the proposed scheme, a specific detector for the Controller hijacking attack is designed. The performance of this scheme is evaluated be connected the detector to NCS with basic security elements such as Data Encryption Standard (DES), Message Digest (MD5), and timestamp. The detector is tested along with Networked PID Controller under stealthy hijacking attack. The test results of the proposed method show that the hijacked Controller can be significantly detected and recovered.
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intelligent generalized predictive Control strategy for Networked Control System with an internal cyber attack detector
Emerging Technologies and Factory Automation, 2016Co-Authors: Amer Atta Yaseen, Mireille BayartAbstract:The Generalized Predictive Controller (GPC) is a preferred Controller implementation method in the Networked Control System (NCS). However, the prediction feature of the standard GPC weakens the ability for fast detection of cyber-attack on the remote plant side. This paper proposes an Intelligent Generalized Predictive Controller (IGPC) as an enhancement for the standard GPC. The IGPC is designed along with an internal cyber-attack detector; this one is based on the comparison between the predicted and actual nonlinear terms of the plant by a specific computation algorithm. The test result of the proposed method shows that it can be significantly used for detection of the cyber-attack.
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Attack-tolerant Networked Control System in presence of the Controller hijacking attack
2016Co-Authors: Amer Yaseen, Mireille BayartAbstract:In this paper, an enhancement for the attacktolerant scheme in the Networked Control System (NCS) is introduced. The objective is to be able to react to an attack such as the Stuxnet case where the Controller is reprogrammed and hijacked. The advantage of this proposed approach is that there is no need for a priori mathematical model of the Controller. In order to implement the proposed scheme, a specific detector for the Controller hijacking attack is designed. The performance of this scheme is evaluated be connected the detector to NCS with basic security elements such as Data Encryption Standard (DES), Message Digest (MD5), and timestamp. The test results of the proposed method show that the hijacked Controller can be significantly detected and recovered.
