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IEEE International Symposium on Industrial Electronics (ISIE)

作者： Lin Ma Kai Sun Remus Teodorescu Josep M. Guerrero Xinmin Jin Department of Energy Technology Aalborg University Aalborg Denmark School of Electrical Engineering Beijing Jiao Tong University Beijing China State Key Lab of Power Systems Tsinghua University Beijing China Dept. of Automatic Control Systems and Computer Engineering Universitat Politecnica de Catalunya Barcelona Spain

Due to the stochastic characteristic of photovoltaic (PV) generation, energy storage devices are indispensable to smooth the power flow and provide the electric energy with high quality. In this paper, an integrated DC/DC converter is proposed to realize high performance interfaces for PV array, battery and load. This converter consists of a boost converter for the PV array and a buck/boost converter for the battery, which can realize multifunction including power generation, charge and discharge. The grid-connected and stand-alone operation modes of this converter are analyzed. From this analysis, the control strategies are developed for both modes. A coordination scheme is proposed for the power balance at the stand-alone mode. Simulation and experiments verify the practical feasibility and effectiveness of this multi-function converter.

关键词： Batteries Arrays DC-DC power converters Voltage control Inverters Load flow

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Energy-optimized secure remote fingerprint authentication in a mobile environment

Energy-optimized secure remote fingerprint authentication in...

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IEEE International Conference on Consumer Electronics (ICCE)

作者： Seungwoo Hong Sungju Lee Yongwha Chung Hakil Kim Sungbum Pan Human ID Research Team Electronics and Telecommunications Research Institute South Korea Human ID Research Team Dept. of Computer and Information Science Korea University South Korea Dept. of Computer and Information Science Korea University Dent. of Information and Communication Engineering Biometrics Engineering Research Center Inha University South Korea Dept. Control Instrumentation and Robot Engineering Chosun University South of Korea

ISBN: (纸本)9781424443147

To optimize the energy consumption during transmission in a secure remote fingerprint authentication system, most approaches have considered a fixed-rate compression of WSQ(Wavelet Scalar Quantization). To balance the energy consumption and the recognition accuracy, however, we need to consider the total energy consumption during compression/encryption/transmission and the quality of the given image. In this paper, we first develop an energy-accuracy prediction model. Then, from the given image, we can evaluate the quality of it. Finally, from the user's minimum requirement of the recognition accuracy, the energy-optimized compression rate under the requirement can be derived adaptively. Based on the experimental result, we show that total energy consumption of the fixed approach can be reduced by 29%.

关键词： Fingerprint recognition Authentication Image coding Image matching Energy consumption Handheld computers Cryptography Power engineering and energy Image recognition Biometrics

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Web-based control Laboratory: The Ball and Beam System

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IFAC Proceedings Volumes 2010年第24期42卷 174-179页

作者： M. Guinaldo H. Vargas J. Sánchez E. Sanz S. Dormido Dept. Of Computer Science and Automatic Control UNED C/ Juan del Rosal 16 28040 Madrid Spain (e-mail: mguinaldo@bec.uned.es hvargas@bec.uned.es jsanchez@dia.uned.es esanz@usal.es sdormido@dia.uned.es)

This paper presents a Web-based control laboratory of a non-linear and unstable system: the ball and beam plant. Different control strategies, apart from the traditional PID, as Robust, Fuzzy and PD-Reset control have been taken to give students a wider vision of control approaches. The client-side of the virtual laboratory has been developed using EJS (Easy Java Simulations), an open-source tool that allows creating Java applications easily. Meanwhile, the application that locally interacts with the system is written in LabVIEW. Different experiences are presented showing the advantages of advanced control strategies over PD control.

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Surgical Case Identification for an Image-Guided Interventional System

Surgical Case Identification for an Image-Guided Interventio...

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2010 IEEE/RSJ International Conference on Intelligent Robots and Systems

作者： Tamás Haidegger Peter Kazanzides Balázs Benyó Levente Kovács Zoltán Benyó Dept. of Control Engineering and Information Technology Budapest University of Technology and Economics Budapest Hungary Johns Hopkins University Center for Computer Integrated Surgical Systems and Technology Baltimore MD USA

Image-guided surgery offers great advantages to surgeons through the possibility to track tools in 3D space and to navigate based on the virtual model of the patient. In the case of robot-assisted procedures, both the inherent accuracy of the system components and the quality of the registration procedures are critical to provide high precision treatment delivery. One of the major barriers towards more technology-integrated procedures is the fact that alterations in the operating room environment can fundamentally change the performance of the system, decrease the accuracy, and therefore pose significant danger to the patient. Surgical events from the control point of view may include motion of the robot, motion of the camera, or motion of the patient. The paper describes a new concept to treat these events, to track and automatically compensate for abrupt changes that may affect the accuracy of a robot-integrated interventional system. Our solution is to use all available information at a given time, including the intra-operative tracker's internal base frame, to distinguish between different surgical events. The concept has been developed and tested on the neurosurgical robot system at the Johns Hopkins University. Initial experiments performed on data recordings from simulated scenarios showed that the algorithm was able to correctly identify the cases.

关键词： Surgery Cameras Robot kinematics Robot vision systems Tracking Navigation

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A move-blocking strategy to improve tracking in predictive control

A move-blocking strategy to improve tracking in predictive c...

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American control Conference

作者： G. Valencia-Palomo M. Pelegrinis J.A. Rossiter R. Gondhalekar Department of Automatic Control and Systems Eng. University of Sheffield South Yorkshire UK. S1 3JD Frontier Research Base for Global Young Researcher and Dept. of Mechanical Engineering Osaka University Japan

ISBN: (纸本)9781424474264

One of the advantages of model predictive control is its ability to take optimal account of information about future setpoint changes in the design of the control law. However, it is easy to show that the default optimum GPC (Generalized Predictive control) law that uses this information can lead to a deterioration rather than an improvement in performance. This paper discusses some simple modifications to overcome this problem. Specifically the focus here is on move-blocking approaches which seek to extend the effective input horizon while restricting the number of optimisation variables. A simple algorithm is proposed which allows optimal nominal performance and tracking without the undesirable effects arising from the standard approaches;hence the proposed modification always improves algorithm performance.

关键词： Predictive control tracking Predictive control control law tracking undesirable effects

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Bell-shaped potential functions for multi-agent formation control in cluttered environment

Bell-shaped potential functions for multi-agent formation co...

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Mediterranean Conference on control and Automation (MED)

作者： Kristian Hengster-Movrić Stjepan Bogdan Ivica Draganjac Automation & Robotics Research Institute University of Texas Arlington USA Automatin&Robotics Research Institute University of Texas at Arilington USA Dept. of Control and Computer Engineering University of Zagreb CROATIA Croatia

In this paper we analyze stability properties of multi-agent control system in a cluttered environment with an artificial potential based on bell-shaped functions. In our approach attractive and repulsive forces created by potential gradient have the same form which allows definition of target formation that is parameter invariant. Due to the fact that agents are identical, the proposed structure of formation potential is invariant to the interchange of agents configurations, hence, target in which particular agent would eventually end up, depends only on formation initial condition and environment structure (obstacles). We show that position of unwanted stable equilibria can be controlled by parameters that define elementary potential functions. This fact has been used for synthesis of an adaptation algorithm, such that arrival of agents at required formation is guarantied. Simulation results, presented at the end of the paper, confirm correctness of the proposed control scheme.

关键词： Navigation Stability analysis Force Lead Trajectory Geometry

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Electro-thermal simulation and characterization of preconcentration membranes

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Procedia engineering 2010年 5卷 1264-1267页

作者： R. Inglés J. Pallares I. Gràcia A.M Gué J.L. Ramirez Dept. of Electronic Electrical and Automatic Control Engineering ETSE Universitat Rovira i Virgili Tarragona Spain Department of Mechanical Engineering ETSEQ Universitat Rovira i Virgili Tarragona Spain Centro Nacional de Microelectrónica CNM-CSIC Bellaterra Spain Laboratoire d’analyse et arquitecture des systèmes (LAAS) CNRS Toulouse France

Preconcentrators have been much studied last years to enhance sensitivity of gas sensors. We use electro-thermal simulations to design thermal isolated membranes that supports thin film heaters as components of gas preconcentrators, these heaters provide a good thermal homogeneity ensuring a narrow desorption peak and improving in this way the sensors response. We have validated our simulations with experimental results.

关键词： Preconcentrator Heater design Electrothermal simulation

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Performance/Robustness Limit Evaluation for Lyapunov-Stable Nonlinear Plants

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IFAC Proceedings Volumes 2010年第10期43卷 202-207页

作者： Cs. Bányász L. Keviczky Computer and Automation Research Institute of the H. Ac. of Sc. Control Engineering Research Group of the H. Ac. of Sc.at the Dept. of Automation and Informatics Budapest Univ. of Technology and Economics H-1111 Budapest Kende u 13-17 HUNGARY

Lyapunov-stable nonlinear plants can be approximated by an LTI model in many cases. If this approximation is obtained then it is possible to construct a G2DOF control system. The paper presents a new approach how the important relationships between the actuator, process and design parameters furthermore robustness measures can be determined. In this decomposition method the optimal control design for two-degree of freedom time delay control systems is discussed. Using a proper CAD algorithm the exact relationships can be plotted and the ultimate robustness limit of any control can be explicitly calculated.

关键词： nonlinear control Lyapunov stability performance analysis robustness limit

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Electro-thermal simulations to improve heater design in preconcentration membranes

Electro-thermal simulations to improve heater design in prec...

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International Workshop on Thermal Investigation of ICs and Systems (THERMINIC)

作者： R. Inglés J. Pallares I. Gràcia A. M Gué J. L. Ramirez Dept. of Electronic Electrical and Automatic Control Engineering Universitat Rovira i Virgili Tarragona Spain Department of Mechanical Engineering Universitat Rovira i Virgili Tarragona Spain Centro Nacional de Microelectronica CNM-CSIC Bellaterra Spain Centro Nacional de Microelectronica CNM-CSIC Bellaterra Bellaterra Spain Laboratoirc d'analyse et arquitecture des systemes (LAAS) CNRS Toulouse France

We have developed electro-thermal 3D transient simulations in order to design an optimized heater for preconcentration membranes. An evaluation of parameters of simulation and boundary conditions have been done. We ha... 详细信息

关键词： Biomembranes Resistance heating Resistance Temperature measurement Atmospheric modeling

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Design and performance analysis of networked control systems with random delay

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Journal of Systems engineering and Electronics 2009年第4期20卷 807-822页

作者： Xia Yuanqing Fu Mengyin Liu Bo Liu Guoping Dept. of Automatic Control Beijing Inst. of Technology Beijing 100081 P. R. China Dept. of Engineering Univ. of Glamorgan Pontypridd CF37 1DL U. K.

The design and performance analysis of networked control systems with random network delay in the forward channel is proposed, which are described in a state-space form. A new control scheme is used to overcome the effects of network transmission delay, which is termed networked predictive control （NPC）. Furthermore, three different ways to choose control input are discussed and the performances are analyzed, respectively. Both real-time simulations and practical experiments show the effectiveness of the control scheme.

关键词： networked control system. Dredictive control random network delay stability

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