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Computational Approaches for Bad Data Handling in Power System Synchrophasor Networks

IFAC Proceedings Volumes 2014年第3期47卷 11269-11274页

作者： Ganesh K. Venayagamoorthy Real-Time Power and Intelligent Systems Laboratory Department of Electrical and Computer Engineering Clemson University Clemson SC 29634 USA Tel: +1 864-6565936

The state estimators used in real-time power system control centers now process bad data as a standard routine. With the introduction and deployment of phasor measurement units (PMUs), it is possible to model power systems, even with their time-varying nature, in real-time. However, PMUs remain vulnerable to providing bad data for several reasons. In this paper, a new intelligent framework, the cellular computational netwo rk (CCN), is introduced for the decentralized predictive modeling and dynamic state estimation (DSE) of a power system with PMU data. The CCN-based DSE is resilient to interactions between multiple segments of bad data from one or more PMUs.

关键词： Bad Data Phasor Measurement Units Power System Synchrophasor Network

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Principal Component Analysis Anomaly Detector for Rotor Broken Bars

Principal Component Analysis Anomaly Detector for Rotor Brok...

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Annual Conference of the IEEE Industrial Electronics Society

作者： Mohammed Obaid Mustafa George Georgoulas George Nikolakopoulos Control Engineering Group Department of Computer Science Electrical and Space Engineering Lulea University of Technology Laboratory of Knowledge and Intelligent Computing (KIC) Department of Computer Engineering Technological Educational Institute of Epirus

ISBN: (纸本)9781479940318

In this article a method for the detection of broken rotor bars in asynchronous machines operating under full load is presented. Unlike most Motor Current Signature Analysis (MCSA) approaches, which operate in the frequency domain, our method operates in the time domain. The scheme is based on the use of a Principal Component Analysis (PCA) fault/anomaly detector. PCA is applied on the three stator currents to subsequently calculate the Q statistic which is employed for detecting the presence/absence of a fault. The efficiency of the proposed scheme was experimentally evaluated using different fault severity levels, ranging from 1/4 of a broken bar to three broken bars. The obtained results indicate that the method can detect the caused asymmetry with a very restricted amount of data.

关键词： Principal component analysis Rotors Bars Induction motors Detectors Stators Fault detection

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Detecting Integrity Attacks on control systems using Robust Physical Watermarking

Detecting Integrity Attacks on Control Systems using Robust ...

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IEEE Annual Conference on Decision and control

作者： Sean Weerakkody Yilin Mo Bruno Sinopoli Department of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA 15213 Control and Dynamical Systems Department of California Institute of Technology

ISBN: (纸本)9781467360890

Ensuring the security of control systems against integrity attacks is a major challenge. Due to the events of Stuxnet, replay attacks in particular have been considered by the research community. Replaying previous measurements of a system in steady state allows an adversary to generate statistically correct virtual outputs which can bypass traditional detectors. The adversary can then inject destabilizing inputs to cause damage to the plant. The method of injecting secret noisy control inputs, or physical watermarking, has recently been proposed to detect replay attacks. However, the proposed watermarking design methods assume that the adversary does not use his potential access to real time communication channels to create stealthy virtual outputs to send to the defender. In this paper, we formulate an attack model for an adversary who uses knowledge of the system as well as access to a subset of real time control inputs and sensor outputs to construct stealthy virtual outputs. A robust physical watermark and detector to counter such an adversary is proposed.

关键词： control systems Watermarking Knowledge systems Virtual Output Access

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Flexible triangular formation keeping of marine robotic vehicles using range measurements 19

Flexible triangular formation keeping of marine robotic vehi...

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19th IFAC World Congress on International Federation of Automatic control, IFAC 2014

作者： Rego, Francisco Soares, Jorge M. Pascoal, António Aguiar, A. Pedro Jones, Colin Laboratory of Robotics and Systems in Engineering and Science Instituto Superior Técnico University of Lisbon Lisbon Portugal Department of Electrical and Computer Engineering Faculty of Engineering University of Porto Porto Portugal Institute of Mechanical Engineering School of Engineering École Polytechnique Fédérale de Lausanne Lausanne Switzerland Distributed Intelligent Systems and Algorithms Laboratory School of Architecture Civil and Environmental Engineering École Polytechnique Fédérale de Lausanne Lausanne Switzerland National Institute of Oceanography Dona Paula Goa India

ISBN: (纸本)9783902823625

This paper addresses the problem of keeping an autonomous marine vehicle in a moving triangular formation by regulating its position with respect to two leader vehicles. The follower vehicle has no prior knowledge of the path described by the leaders but has access to their heading angle and is able to measure inter-vehicle ranges. It is assumed that the distance between the leaders is constant and known. A control strategy is adopted that generates speed and heading commands so as to drive suitably defined along track and cross track errors to zero. The commands are used as input to local inner loops for yaw and speed control. The paper describes the algorithms derived for range-based control and assesses their performance in simulations using realistic models of the vehicles involved. Tests with three autonomous marine vehicles equipped with acoustic modems and ranging devices allow for the evaluation of the performance of the algorithms in a real-world situation. © IFAC.

关键词： Vehicle performance

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Applications of Brain–Machine Interface systems in Stroke Recovery and Rehabilitation

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Current Physical Medicine and Rehabilitation Reports 2014年第2期2卷 93-105页

作者： Venkatakrishnan, Anusha Francisco, Gerard E. L. Contreras-Vidal, Jose Laboratory for Non-invasive Brain–Machine Interface Systems Department of Electrical and Computer Engineering University of Houston Houston TX United States Department of Physical Medicine and Rehabilitation University of Texas Health Science Center Houston TX United States NeuroRecovery Research Center TIRR Memorial Hermann Houston Houston TX United States

Stroke is a leading cause of disability, significantly impacting the quality of life (QOL) in survivors, and rehabilitation remains the mainstay of treatment in these patients. Recent engineering and technological advances such as brain–machine interfaces (BMI) and robotic rehabilitative devices are promising to enhance stroke neurorehabilitation, to accelerate functional recovery and improve QOL. This review discusses the recent applications of BMI and robotic-assisted rehabilitation in stroke patients. We present the framework for integrated BMI and robotic-assisted therapies, and discuss their potential therapeutic, assistive and diagnostic functions in stroke rehabilitation. Finally, we conclude with an outlook on the potential challenges and future directions of these neurotechnologies, and their impact on clinical rehabilitation. © 2014, Springer Science + Business Media New York.

关键词： Brain–machine interfaces Clinical trials Functional recovery Neuroplasticity Neurorehabilitation Robotic exoskeletons Robotic-assisted rehabilitation Stroke

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Continuous-time intruder isolation using Unattended Ground Sensors on graphs

Continuous-time intruder isolation using Unattended Ground S...

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2014 American control Conference, ACC 2014

作者： Chen, Hua Kalyanam, Krishna Zhang, Wei Casbeer, David Department of Electrical and Computer Engineering Ohio State University Columbus OH 43210 United States InfoSciTex Corporation Dayton OH 45431 United States Autonomous Control Branch Air Force Research Laboratory Wright-Patterson AFB OH 45433 United States

ISBN: (纸本)9781479932726

This paper studies the continuous-time intruder isolation problem on a general road network graph under delayed information scenario. Several Unattended Ground Sensors (UGSs) are pre-installed along certain edges of the graph for detecting intruder motion and recording the detection time. Measurements of a UGS can only be obtained when the UAV is within its communication range. The goal of this paper is to find the optimal path for the UAV to follow in order to capture the intruder within the shortest time, based on the delayed information from the visited UGSs. We propose an unfolding strategy to transform the road network graph to a decision tree incorporating delayed measurement information. Based on the decision tree, both optimal and sub-optimal min-max solutions are developed. Several interesting properties of the corresponding optimal value function are also derived. Numerical simulations based on a real road network are presented to demonstrate the effectiveness of the proposed strategies. © 2014 American Automatic control Council.

关键词： Decision trees

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Networked systems with incomplete information

Abstract and Applied Analysis

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Abstract and Applied Analysis 2015年第1期2015卷

作者： Wang, Zidong Shen, Bo Dong, Hongli He, Xiao Hu, Jun Department of Computer Science Brunel University London Uxbridge Middlesex UB8 3PH United Kingdom School of Information Science and Technology Donghua University Shanghai 200051 China College of Electrical and Information Engineering Northeast Petroleum University Daqing 163318 China Research Institute of Intelligent Control and Systems Harbin Institute of Technology Harbin 150001 China Department of Automation Tsinghua University Beijing 100084 China Department of Applied Mathematics Harbin University of Science and Technology Harbin 150080 China

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Method to Improve the Performance of Communication-Based Train control(CBTC) systems with Transmission Delays and Packet Drops

Method to Improve the Performance of Communication-Based Tra...

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17th International IEEE Conference on Intelligent Transportation systems & The Asia-Pacific Council on systems engineering Conference 2014

作者： Bing Bu Fei Richard Yu Tao Tang State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Department of Systems and Computer Engineering Carleton University

Communication-based train control(CBTC)systems use wireless local area networks(WLANs)for trainground *** delays and packet drops may cause unnecessary tractions and brakes of trains,degradation of riding comfortability,rising of energy consumption and loss of the line’s *** this paper,We model the system to control a group of trains in CBTC as a networked control system(NCS)with transmission delays and packet *** study the delays and packet drops in CBTC,analyze their effects on train’s control,and propose a method to improve the performance of *** simulation results are *** show that our proposed method has a strong tolerance for transmission delays and packet drops,and outperforms the currently adopted scheme in different channel conditions.

关键词： Method to Improve the Performance of Communication-Based Train control systems with Transmission Delays and Packet Drops

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Prediction of Atheromatic Plaque Evolution in Carotids using Features extracted from the Arterial Geometry

Prediction of Atheromatic Plaque Evolution in Carotids using...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society

作者： Paschalis A. Bizopoulos Antonis I. Sakellarios Dimitrios D. Koutsouris Jannis Kountouras Lazaros Kostretzis Stella Karagergou Lampros K. Michalis Dimitrios I. Fotiadis the Biomedical Engineering Laboratory School of Electrical and Computer Engineering National Technical University of Athens (NTUA) GR 15773 Zografou Athens Greece the Unit of Medical Technology and Intelligent Information Systems Dept. of Materials Science and Engineering University of Ioannina GR 45110 Ioannina Greece the Department of Medicine Second Medical Clinic Aristotle University of Thessaloniki Ippokration Hospital Thessaloniki Greece the First Orthopaedic Department G.Papanikolaou Hospital GR 5701 Exohi Thessaloniki Greece the Obstetricts and Gynecology Department General Hospital of Serres Ag. Ioannis GR 62100 Serres Greece the Michaelideion Cardiac Center Department of Cardiology in Medical School GR 45110 University of Ioannina Ioannina Greece

ISBN: (纸本)9781424492695

Knowing the arterial geometry might be helpful in the assessment of a plaque rupture event. We present a proof of concept study implementing a novel method which can predict the evolution in time of the atheromatic plaque in carotids using only statistical features which are extracted from the arterial geometry. Four feature selection methods were compared: Quadratic Programming Feature Selection (QPFS), Minimal Redundancy Maximal Relevance (mRMR), Mutual Information Quotient (MIQ) and Spectral Conditional Mutual Information (SPECCMI). The classifier used is the Support Vector Machines (SVM) with linear and Gaussian kernels. The maximum accuracy that was achieved in predicting the variation in the mean value of the Lumen distance from the centerline and the thickness was 71.2% and 70.7% respectively.

关键词： QPFS MIQ SPECCMI

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On YASS’s Non-monotonic Security Performance

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Circuits, systems, and Signal Processing 2014年第11期33卷 3527-3537页

作者： Yu, Lifang Zhao, Yao Ni, Rongrong Shi, Yun Qing Institute of Information Science Beijing Jiaotong University Beijing100044 China Beijing Key Laboratory of Signal and Information Processing for High-end Printing Equipments Beijing Institute of Graphic Communication Beijing102600 China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing100044 China Beijing Key Laboratory of Advanced Information Science and Network Technology Beijing100044 China Department of Electrical and Computer Engineering New Jersey Institute of Technology NewarkNJ07102 United States

Recently, researchers have discovered unexpected bumps in the detection rate curve of yet another steganographic scheme (YASS). We refer to this abnormal phenomenon as non-monotonic security performance. This paper first analyzes this abnormality and points out that it is caused by the non-uniformity in probability of coincidence of (Formula presented.) embedding blocks and (Formula presented.) JPEG blocks. Based on this observation, we propose that further randomizing data embedding positions can overcome the non-monotonic security performance. Experimental results have demonstrated a complete removal of bumps in the detection rate curve of YASS after further randomization. © 2014, Springer Science+Business Media New York.

关键词： Steganography

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