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2009 5th IEEE GCC Conference and Exhibition, GCC 2009

作者： Krejcar, Ondrej Konarik, Petr VSB-Technical University of Ostrava Faculty of Electrical Engineering and Computer Science Department of Measurement and Control Centre for Applied Cybernetics 17. listopadu 15 708 33 Ostrava-Poruba Czech Republic VSB-Technical University of Ostrava Faculty of Mechanical Engineering Department of Control System and Instrumentation 17. listopadu 15 708 33 Ostrava-Poruba Czech Republic

ISBN: (纸本)9781424438853

Paper shows direct connection and implementation way of designed control schemas of prepared applications to an industrial WinPLC. Paper deals with industrial realization of feedback control of demanding applications on their control, control algorithms and visualization together with design, implementation and real time control from MATLAB/Simulink Environment. Described is a way to produce a permanent solution in control applications that are fully prepared, designed and implemented directly from MATLAB/Simulink to the target control platform. As a part, the mentioned solution is using a multiplatform control system REX as a bridge between MATLAB and target platforms. These methods allow minimizing costs of development of control of applications, because it produces target permanent realizations in comparison to classical development methods that usually need expensive real time measurement cards and produce only one purpose development solution. As next benefit the application is created for visualization the data from RT database during the measurement and control process. This last benefit produce an interesting data from real control process to give a next reason to use of WinCon solution.

关键词： Visualization

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Application of Random PWM Techniques for Reducing the Electromagnetic Interference of Vienna Rectifiers in Distribution Power system

Application of Random PWM Techniques for Reducing the Electr...

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2009 IEEE 6th International Power Electronics and Motion control Conference-ECCE Asia

作者： Shahriyar Kaboli Amir Hossein Rajaei Aras Sheikhi Center of Excellence in Power System Management and Control Department of Electrical Engineering Sharif University of Technology Department of Electrical and Computer Engineering Tarbiat Modares University

Random pulse width modulation (RPWM) technique has been employed to generate the control signals of Vienna-type rectifier. This technique is compared to two conventional techniques (Hysteresis-band and ramp comparison with fix frequency carrier signal). Simulation results are illustrated for three approaches. The results verify significantly reduction of high frequency harmonics magnitude;and consequently overcome electromagnetic interference (EMI) problem in this active type of rectifier.

关键词： PWM Application of Random PWM Techniques for Reducing the Electromagnetic Interference of Vienna Rectifiers in Distribution Power system

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Object detection and modeling algorithm for automatic visual people counting system

Object detection and modeling algorithm for automatic visual...

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International Conference on Electrical engineering/Electronics, computer, Telecommunications and Information Technology, ECTI-CON

作者： Kulrapat Jaijing Pakorn Kaewtrakulpong Supakorn Siddhichai Department of Computer Engineering Department of Instrumentation and Control System Engineering Faculty of Engineering King Mongkut's University of Technology Thonburi Bangkok Thailand National Electronics and Computer Technology Center Pathum Thani Thailand

This paper presents object detection and modeling algorithm for automatic visual people counting system to identify individuals from top view images acquired from an overhead surveillance camera. This work proposes Snake algorithm with effective external energy function and a half-circle template initialization for modeling passengers. The experiment result showed that the proposed method could fit the Snake to the head and shoulder boundaries of the passengers effectively. Fitting error of 3.76 pixels per control point was obtained in our experiment. The information is not only useful for verifying humans but also for extracting appearance features to enhance performance of the subsequent tracking algorithm.

关键词： Object detection Cameras Head Humans Data mining Surveillance Feature extraction Image segmentation Counting circuits computer errors

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Hardware-efficient auto-correlation for synchronization of MIMO-OFDM WLAN systems

Hardware-efficient auto-correlation for synchronization of M...

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International SoC Design Conference, ISOCC

作者： Jongmin Cho Youngmin Cho Mohammad Rakibul Islam Jinsang Kim Won-Kyung Cho Computer System Architecture & VLSI Laboratory Department of Electronics and Radio Engineering Kyung Hee University Yongin si Gyeonggi South Korea

ISBN: (纸本)9781424450343;9781424450350

This paper presents a hardware-efficient autocorrelation scheme for the synchronization of MIMO-OFDM based wireless local area network (WLAN) systems, such as IEEE 802.11n. Carrier frequency offset (CFO) estimation for the frequency synchronization requires high complexity autocorrelation operations of many training symbols. In order to reduce the hardware complexity of the MIMO-OFDM synchronization, we propose an efficient correlation scheme based on time-multiplexing technique and the use of reduced samples while preserving the performance. Compared to a conventional architecture, the proposed architecture requires only 27% logic gates and 22% power consumption with acceptable BER performance loss.

关键词： Autocorrelation Wireless LAN Frequency synchronization OFDM Hardware Very large scale integration MIMO Timing Frequency estimation Energy consumption

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Low-complexity carrier frequency offset estimation using novel range pointer method for OFDM-based WLAN systems

Low-complexity carrier frequency offset estimation using nov...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： Jongmin Cho Jinsang Kim Won-Kyung Cho Computer System Architecture & VLSI Laboratory Department of Electronics and Radio Engineering Kyung Hee University Yongin si Gyeonggi South Korea

ISBN: (纸本)9781424438273

In this paper, we propose a low-complexity carrier frequency offset (CFO) estimation algorithm for OFDM based wireless LAN, IEEE 802.11a. The complexity of the arctangent operation to calculate the argument of auto-correlation for CFO estimation is reduced by a novel range pointer method. The proposed algorithm estimates fine CFO value first and then based on the fine CFO value, simple criteria is used for the boundary decision of integer CFO estimation. The simulation results show that the performance of the proposed algorithm is slightly better than the conventional method while the computational complexity is reduced by 50%. Furthermore, the proposed method can be easily implemented for the low complex next generation MIMO-OFDM based WLAN systems.

关键词： Frequency estimation Wireless LAN OFDM Autocorrelation Frequency synchronization Table lookup Sociotechnical systems Very large scale integration Iterative algorithms Degradation

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Optimal motion planning for robotic manipulators with dynamic obstacles using mixed-integer linear programming

Optimal motion planning for robotic manipulators with dynami...

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Mediterranean Conference on control and Automation (MED)

作者： Hao Ding Mingxiang Zhou Olaf Stursberg Institute of Control and System Theory Department of Electrical Engineering and Computer Science University of Kassel Kassel Germany Institute of Automatic Control Engineering Technische Universität München Munich Germany

The task of motion planning for robotic manipulators means to drive an end-effector between designated points in the work area while obstacles are not hit. This contribution investigates the case of dynamic obstacles (like human operators) and the consideration of a performance criterion to be maximized for the motion. The proposed approach maps the dynamics of the manipulator and the obstacles into the C times T-space (spanned by the configuration C and the time T). Within this space, an (sub-)optimal sequence of configurations in the collision-free subspace is determined by mixed-integer linear programming. To achieve sufficient computational efficiency, the optimization task is approached by employing the principles of model predictive control. The paper describes the approach based on the example of a two-link robot interacting with a human operator.

关键词： Manipulator dynamics Motion planning Robots Dynamic programming Linear programming Orbital robotics Path planning Robotics and automation Trajectory Automatic control

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Low Cost RT Process control Using Windows PLC by MATLAB/Simulink Throw the REX control system by Secured Wireless Network

Low Cost RT Process Control Using Windows PLC by MATLAB/Simu...

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ICONS International Conference on systems

作者： Ondrej Krejcar Petr Konarik Department of Measurement and Control Centre for Applied Cybernetics Faculty of Electrical Engineering and Computer Science Ostrava-Poruba Department of Measurement and Control Centre for Applied Cybernetics Faculty of Electrical Engineering and Computer Science Ostrava-Poruba Czech Republic Department of Control System and Instrumentation VSB-Technical University of Ostrava Faculty of Mechanical Engineering Ostrava-Poruba Czech Republic

Paper deals with industrial realization of feedback control of demanding applications on theirs control, control algorithms and visualization together with real time control from MATLAB/Simulink Environment. Paper shows direct connection and implementation way of designed control schemas of prepared applications to an industrial WinPLC. Described is a way to produce a permanent solution in control applications that are fully prepared, designed and implemented directly from MATLAB/Simulink to the target control platform. As a part, the mentioned solution is using a multiplatform control system REX as a bridge between MATLAB and target platforms. These methods allow minimizing costs of development of control of applications, because it produces target permanent realizations in comparison to classical development methods that usually need expensive real time measurement cards and produce only one purpose development solution.

关键词： Costs Process control Programmable control MATLAB control systems Wireless networks Electrical equipment industry Industrial control Pulp and paper industry Feedback control

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Detecting and Eliminating Potential Violations of Sequential Consistency for Concurrent C/C++ Programs 09

Detecting and Eliminating Potential Violations of Sequential...

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International Symposium on Code Generation and Optimization (CGO)

作者： Yuelu Duan Xiaobing Feng Lei Wang Chao Zhang Pen-Chung Yew Key Laboratory of Computer System and Architecture Institute of Computing Technology Chinese Academy and Sciences Beijing China Department of Computer Science and Engineering University of Minnesota Twin-Cities Minneapolis USA

ISBN: (纸本)9780769535760

When a concurrent shared-memory program written with a sequential consistency (SC) model is run on a machine implemented with a relaxed consistency (RC) model, it could cause SC violations that are very hard to debug. To avoid such violations, programmers need to provide explicit synchronizations or insert fence instructions. In this paper, we propose a scheme to detect and eliminate potential SC violations by combining Shasha/Snir's conflict graph and delay set theory with existing data race detection techniques. For each execution, we generate a race graph, which contains the improperly synchronized conflict accesses, called race accesses, and race cycles formed with those accesses. As a race cycle would probably lead to a non-sequential-consistent execution, we call it a potential violation of sequential consistency (PVSC) bug. We then compute the race delays of race cycles, and suggest programmers to insert fences into source code to eliminate PVSC bugs. We further convert a race graph into a PC race graph, and improves cycle detection and race delay computation to O(n 2 ), where n is the number of race access instructions. We evaluate our approach with the SPLASH-2 benchmarks, two large real-world applications (MySQL and Apache), and several multi-threaded Cilk programs. The results show that (1) the proposed approach could effec-tively detect PVSC bugs in real-world applications with good scalability; (2) it retains most of the performance of the concurrent program after inserting required fence instructions, with less than 6.3% performance loss; and (3) the additional cost of our approach over traditional race detection techniques is quite low, with 3.3% on average.

关键词： Programming profession Delay Set theory computer bugs Performance loss Chaos computer science Laboratories Concurrent computing computer architecture

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Distributed state and unknown input estimation for freeway traffic flow models 10

Distributed state and unknown input estimation for freeway t...

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2009 10th European control Conference, ECC 2009

作者： Luspay, T. Kulcsar, B. Tettamanti, T. Varga, I. Bokor, J. Systems and Control Laboratory Computer and Automation Research Institute HAS Kende u. 13.-17 BudapestH-1111 Hungary Delft Center for System and Control Faculty of Mechanical Maritime and Materials Engineering Technical University of Delft Mekelweg 2 Delft Netherlands Department of Control and Transport Automation Budapest University of Technology and Economics Bertalan L. u. 2 BudapestH-1111 Hungary

ISBN: (纸本)9783952417393

The paper presents a joint state and unmeasured input estimation technique for a special class of nonlinear second order macroscopic traffic model. The freeway traffic system is transformed into a quasi and affine approximate Lin- ear Parameter Varying (LPV) form. Observer design technique is formulated using off-line optimization problem subjected to Linear Matrix Inequality (LMI) conditions, considering uncertain scheduling parameters. Furthermore, locally designed state estimators are interconnected to cover multiple freeway sections. The elaborated method is validated using real traffic measurements. © 2009 EUCA.

关键词： Linear matrix inequalities

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Increasing Reliability of Intelligent Manufacturing systems by Adaptive Optimization and Safety Supervision

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IFAC Proceedings Volumes 2009年第8期42卷 1533-1538页

作者： Hao Ding Sebastian Kain Frank Schiller Olaf Stursberg Institute of Control and System Theory Department of Electrical Engineering and Computer Science University of Kassel D-34109 Kassel Germany Institute of Information Technology in Mechanical Engineering Technische Universität München D-85748 Garching near Munich Germany

For concurrent consideration of reliability and safety of manufacturing systems on the one hand, and flexibility and performance on the other, a specialized control architecture was proposed recently. It consists of a strategic controller for online computing (sub-)optimal control strategies under consideration of dynamic models, safety specifications, and learned knowledge. The second building block is an operational controller for providing certified safety when dealing with behaviors that are not completely predictable, for instance in case of faults. This paper extends the architecture by a specific technique for the strategic controller: For the case of an intelligent manufacturing system which reacts adaptively to a human operator, control trajectories for a robot arm are computed online such that collision with the operator is excluded. The computation is based on solving a mixed-integer programming problem that takes a dynamic safety area around the operator into account as constraint.

关键词： Reliability Safety Intelligent Manufacturing systems Optimal control

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