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A Difference-Comparison-based Approach for Malicious Meter Inspection in Neighborhood Area Smart Grids

A Difference-Comparison-based Approach for Malicious Meter I...

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IEEE International Conference on Communications

作者： Xiaofang Xia Wei Liang Yang Xiao Meng Zheng Zhifeng Xiao Shenyang Institute of Automation Chinese Academy of Sciences Dept. of Computer Science and Software Engineering Pennsylvania State Erie

ISBN: (纸本)9781467364300

In this paper, we explore the malicious meter inspection (MMI) problem in neighborhood area smart grids. By exploiting a binary inspection tree, we propose a Difference-Comparison-based Inspection (DCI) algorithm to quickly target the malicious meters. Different from existing algorithms, the DCI algorithm is designed based on three rules that are derived according to the difference comparison results in each local subtree. An attractive feature of the DCI algorithm is that it manages to skip a large number of nodes on the binary inspection tree and thus accelerates the detection of malicious nodes. Both analysis and simulation results show that DCI outperforms the existing inspection algorithms in terms of inspection speed, regardless of the ratio and permutation of malicious meters.

关键词： Inspection Smart grids Algorithm design and analysis Smart meters Upper bound Binary trees Vegetation

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Parameterization of Limbus Distance in Van Herick Method's Angle Closure Glaucoma Diagnosis

Parameterization of Limbus Distance in Van Herick Method's A...

引用

International Conference of Information and Communication Technology for Embedded Systems

作者： I. S. Ardakani W. Kongprawechnon T. Theeramunkong P. Bunnun T. Isshiki A. Manassakorn School of ICT Sirindhorn International Institute of Technology (SIIT) Thammasat University PathumThani Thailand Advanced Automation and Electronics Research Unit National Electronics and Computer Technology Center Pathum Thani Thailand Tokyo Institute of Technology Global Scientific Information and Computing Center ICT Support Division Authentication and Networking Group Dept. Communications and Computer Engineering Tokyo Japan Department of Ophthalmology Faculty of Medicine Chulalongkorn University and King Chulalongkorn Memorial Hospital Thai Red Cross Society Bangkok Thailand

ISBN: (纸本)9781509022502

As a non-invasive angle closure glaucoma diagnosis procedure, Van Herick's slit-lamp Limbal Anterior Chamber dept. Estimation (LACDE) technique is preferably the current standard screening method preliminarily performed at hospitals and eye clinics. However, accuracy of dept. estimation is very much dependent on the slit projection distance from the limbus (LD). This study investigated the relation and designed a parametric model to reduce the inconsistencies between results and improving the Van Herick's method accuracy. Additionally, two different types of classifiers such as Support Vector Machine (SVM) and Decision Tree with addition of LD as a predictor were trained and tested for comparison with parametric model. In the end acquired results clearly showed the effectiveness of LD consideration in LACDE, which lead to improvement in the experimental results.

关键词： Limbal Anterior Chamber dept. Measurement Van Herick Method Support Vector Machine Classifier Decision Tree Classifier

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Active fault diagnosis in sampled-data systems 9

Active fault diagnosis in sampled-data systems

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9th IFAC Symposium on Fault Detection, Supervision and Safety for Technical Processes, SAFEPROCESS 2015

作者： Niemann, Henrik Poulsen, Niels Kjølstad Department of Electrical Engineering Automation and Control Technical University of Denmark Building 326 Kgs. LyngbyDK-2800 Denmark Dept. of Applied Mathematics and Computer Science Section for Dynamical Systems Technical University of Denmark Kgs. LyngbyDK-2800 Denmark

The focus in this paper is on active fault diagnosis (AFD) in closed-loop sampleddata systems. Applying the same AFD architecture as for continuous-time systems does not directly result in the same set of closed-loop matrix transfer functions. For continuous-time systems, the LFT (linear fractional transformation) structure in the connection between the parametric faults and the matrix transfer function (also known as the fault signature matrix) applied for AFD is not directly preserved for sampled-data system. As a consequence of this, the AFD methods cannot directly be applied for sampled-data systems. Two methods are considered in this paper to handle the fault signature matrix for sampled-data systems such that standard AFD methods can be applied. The first method is based on a discretization of the system such that the LFT structure is preserved resulting in the same LFT structure in the fault signature matrix as obtained for continuous-time systems. The other method is an approximation method, where the same structure is obtained for small parametric faults. © 2015, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Continuous time systems

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Approximate compressors for error-resilient multiplier design

Approximate compressors for error-resilient multiplier desig...

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IEEE International Symposium on Defect and Fault Tolerance in VLSI Systems

作者： Zhixi Yang Jie Han Fabrizio Lombardi Sch. of Mechatronics and Automation National University of Defense Technology Changsha Hunan China Dept. of Electrical and Computer Engineering University of Alberta Edmonton AB Canada Dept. of Electrical and Computer Engineering Northeastern University Boston MA USA

Approximate circuit design is an innovative paradigm for error-resilient image and signal processing applications. Multiplication is often a fundamental function for many of these applications. In this paper, three approximate compressors are proposed with an accuracy constraint for the partial product reduction (PPR) in a multiplier. Both approximation and truncation are considered in the approximate multiplier design. An image sharpening algorithm is then investigated as an application of the proposed multiplier designs. Extensive simulation results show that the proposed designs achieve significant reductions in area and power while achieving a high signal-to-noise ratio (SNR > 35 dB), compared to their exact counterparts as well as other approximate multipliers.

关键词： Approximation methods Compressors Delays Accuracy Signal to noise ratio Adders Approximation algorithms

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A photoconductive semiconductor switch vertically embedded with MISFETs for high-power high-repetition-rate application

A photoconductive semiconductor switch vertically embedded w...

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IEEE International Symposium on Power Electronics for Distributed Generation Systems (PEDG)

作者： Xinmei Wang Sudip K. Mazumder School of Automation and Information Engineering Xi'an University of Technology Xi'an China Dept. of Electrical and Computer Engineering University of Illinois at Chicago Chicago IL USA

The stagnate on the photoconductive semiconductor switch (PCSS) technology and the development potential are analyzed in the paper. It is pointed out that, if the high-gain mode of a GaAs PCSS can be rapidly quenched to exit the current lock-on state or if the dark leakage current of a GaN or SiC PCSS can be effectively suppressed, the PCSS will be capable to withstand a dc voltage of more than 150 kV and simultaneously to support a switching frequency of 1 MHz. Therefore, a novel PCSS structure, named insulated-gate photoconductive semiconductor switch (IGPCSS) [1], is presented to solve the lock-on and the leakage current problems mentioned above. The IGPCSS fabrication processes are growing three epitaxial layers on a traditional PCSS substrate and then embedding with an array of U-shape n-channel MISFET cells. The MISFET cells in the IGPCSS can not only share the bias dc voltage to dramatically decrease the leakage current and transfer itself voltage to the photoconductive area to yield higher photoelectric conversion efficiency. Next, some important design principles of IGPCSS are proposed and a GaAs IGPCSS is simulated. The simulation results show that the quenched high-gain operation mode of PCSS substrate can be realized through controlling the gate voltage of IGPCSS to lever the internal voltage distribution.

关键词： Gallium arsenide Optical switches Gallium nitride MISFETs Leakage currents Substrates

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PI and PID controller tuning for an automotive application using backtracking search optimization algorithms

PI and PID controller tuning for an automotive application u...

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International Symposium on Applied Computational Intelligence and Informatics ( SACI)

作者： Radu-Emil Precup Alexandra-Dina Balint Emil M. Petriu Mircea-Bogdan Radac Emil-Ioan Voisan Dept. of Automation and Applied Informatics Politehnica University of Timisoara Timisoara Romania School of Electrical Engineering and Computer Science University of Ottawa Ottawa Canada

This paper proposes the optimal tuning of the parameters of PI and PID controllers for an automotive application by Backtracking Search Optimization Algorithms (BSOAs). The automotive application is related to the position control of pancake DC torque motor systems. The effects of the population size, which is an important parameter of BSOAs, on the performance of both the BSOAs and the position control system are discussed using simulation results.

关键词： Control systems Tuning Optimization Linear programming Sociology Statistics Automotive applications

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Emulating Massively Parallel non-Boolean Operators on FPGA

Emulating Massively Parallel non-Boolean Operators on FPGA

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IEEE International Symposium on Circuits and Systems

作者： Andras Kiss Zoltan Nagy Peter Szolgay Gyorgy Csaba Xiaobo Sharon Hu Wolfgang Porod Computer and Automation Research Institute Hungarian Academy of Sciences and Dept. Information Technology Pazmany Peter Catholic University Budapest Hungary Dept. of Electrical Engineering University of Notre Dame Notre Dame IN USA

ISBN: (纸本)9781479983926

In this paper, we demonstrate an optically inspired massively parallel non-Boolean operator which can emulate 3D wave dynamics on a 2D FPGA-based architecture. The algorithm is based on the Paraxial Helmholtz Equation: which describes the beam propagation through different media with different refractive indices. To solve this wave propagation equation numerically the FPGA-accelerated hardware have to operate with spatial varying templates. The FPGA-based implementation is very well parallelizable, consequently it is also be amenable to mega-core architectures.

关键词： Field programmable gate arrays computer architecture Hardware Mathematical model Mixers Media Algorithm design and analysis

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Automatizing the detection of rotor failures in induction motors operated via soft-starters 41

Automatizing the detection of rotor failures in induction mo...

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41st Annual Conference of the IEEE Industrial Electronics Society, IECON 2015

作者： Georgoulas, George Karvelis, Petros Stylios, Chrysostomos D. Tsoumas, Ioannis P. Antonino-Daviu, Jose Alfonso Corral-Hernandez, Jesus Climente-Alarcon, Vicente Nikolakopoulos, George Department of Computer Engineering TEI of Epirus Arta Greece Larges Drives Products RandD Department Siemens Industry Sector - Drive Technologies Nuremberg Germany Instituto de Ingeniería Energética Universitat Politècnica de València Valencia Spain Department of Electrical Engineering and Automation Aalto University P. O. Box 13000 AaltoFI-00076 Finland Computer Science Electrical and Space Engineering Dept. Lulea University of Technology Lulea Sweden

ISBN: (纸本)9781479917624

Implementation of unsupervised induction motor condition monitoring systems has drawn an increasing attention recently among motor drives manufacturers. In the case of soft-starters the possibility of incorporating fault detection features to their conventional functions provides an added value to those elements. Design and development of advanced algorithms that are able to automatically detect and alert about possible failures without requiring continuous human inspection is a challenging research goal. In this paper, an algorithm for the automatic detection of rotor damages in induction motors in the case of soft starting is proposed. The twofold approach relies, first, on the application of a time-frequency transform to the starting current signal and, second, on a pattern recognition stage based on the treatment of the time-frequency representation as a symbolic sequence. The innovation of this work is the implementation of the proposed approach for the automatic detection of rotor cage faults in soft-started motors. The experimental results prove the usefulness of the approach for the automatic detection of such faults and its potential for possible future implementation in soft-started machines. © 2015 IEEE.

关键词： Induction motors

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Estimation of Parametric Fault in Closed-loop Systems

Estimation of Parametric Fault in Closed-loop Systems

引用

American Control Conference

作者： Henrik Niemann Niels Kjolstad Poulsen Dept. of Electrical Engineering Automation and Control Tech. University of Denmark DK-2800 Kgs. Lyngby Denmark Dept. of Applied Mathematics and Computer Science Tech. University of Denmark DK-2800 Kgs. Lyngby Denmark

ISBN: (纸本)9781479917730

The aim of this paper is to present a method for estimation of parametric faults in closed-loop systems. The key technology applied in this paper is coprime factorization of both the dynamic system as well as the feedback controller. Using the Youla-Jabr-Bongiorno-Kucera (YJBK) parameterization, it is shown that a certain matrix transfer function, the fault signature matrix, is an LFT (linear fractional transformation) of the parametric faults. Further, for limit parametric faults, the fault signature matrix transfer function can be approximated with a linear matrix function of the parametric faults.

关键词： Parametric fault estimation closed-loop system feedback controllers YJBK parameterization MIMO systems

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Symbolic time series analysis of the soft starting transient in induction machines

Symbolic time series analysis of the soft starting transient...

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IEEE International Conference on Industrial Technology (ICIT)

作者： Petros Karvelis George Georgoulas Chrysostomos D Stylios Ioannis P. Tsoumas Jose Alfonso Antonino-Daviu Jesús Corral-Hernández Vicente Climente-Alarcón George Nikolakopoulos Dept. of Computer Engineering TEI of Epirus Arta Greece Dept. of Computer Engineering TEI of Epirus Arta Greece Larges Drives Products R&D Department Siemens Industry Sector-Drive Technologies Nuremberg Germany Instituto de Ingeniería Energética Universitat Politècnica de València Valencia Spain Department of Electrical Engineering and Automation Aalto University Finalnd Computer Science Luleå University of Technology Luleå Sweden

ISBN: (纸本)9781479978014

Induction motors are in the heart of almost every production line especially due to their robustness under harsh environments. Nevertheless, even induction machines are prone to faults. Among them, the faults related to the breakage of rotor bars have received special attention by the research community with a number of methods proposed both for the case of steady state as well as for transient operation. For the latter, methods relying on the analysis of the start-up transient have proven to be able to effectively isolate the faulty component that is created by the asymmetry caused by the bar breakage. However, very little work has been done concerning the soft starting of induction machines. In this work, preliminary results of the application of a symbolic time series technique for the analysis of the transient, when the motor is controlled by a soft starter, will be presented and experimentally evaluated.

关键词： Bars Time series analysis Rotors Induction motors Transient analysis Principal component analysis Harmonic analysis

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