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Annual business and news:: Beginning the 31st year of the Journal of Guidance, control, and Dynamics

JOURNAL OF GUIDANCE control AND DYNAMICS 2008年第1期31卷 1-1页

作者： Schmidt, George T. Aeronautics and Astronautics Massachusetts Institute of Technology (MIT) AIAA Institute of Electrical and Electronics Engineers Russian Federation Academy of Navigation and Motion Control Department of Mechanical and Aerospace Engineering and Engineering Mechanics University of Missouri-Rolla(UMR) Lockheed Electronics Company Center for Space Research University of Texas Austin United States Wright Laboratory Eglin Air Force Base UMR AIAA Guidance Navigation and Control Technical Committee American Automatic Control Council Lockheed Martin Aeronautics Company Palmdale CA United States C4ISR and Unmanned Air Vehicle (UAV) Programs for Air Vehicle Sciences and Systems Accreditation Board Engineering and Technology Inc./Aeronautical National Technical Committee on Guidance Navigation and Control Department of Mechanical and Aerospace Engineering University at Buffalo State University of New York (SUNY) AIAA Technical Committee on GN and C Air Vehicles Directorate Air Force Research Laboratory (AFRL) Wright-Patterson Air Force Base Space Access and Hypersonic Vehicle Guidance and Control Group Control Science Center of Excellence AFRL AIAA Technical Committee on Guidance Navigation and Control Department of Mechanical and Aeronautical Engineering University of California (UC) Davis United States Boeing Company Modernized Flight Control System for the Apache Longbow AIAA Institute of Electrical and Electronics Engineers AHS Jet Propulsion Laboratory California Institute of Technology Boeing Company Flight Sciences and Advanced Design Group Guidance Navigation and Control (GN and C) Systems Engineer Distributed Space Systems NASA Goddard Space Flight Center (GSFC) AIAA GN and C Technical Committee Department of Aerospace Engineering and Engineering Mechanics University of Texas Austin United States Institute of Navigation American Astronautical Society AIAA Guidance Navigation (GN and C) and Control Technical Committee Department of Aerospace Engineering Iowa State University Iowa

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Navigation Guidance control Using Haptic Feedback for Obstacle Avoidance of Omni-directional Wheelchair

Navigation Guidance Control Using Haptic Feedback for Obstac...

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International Symposium on Haptic Interfaces for Virtual Environment and Teleoperator systems (HAPTICS)

作者： Yasumasa Kondo Takanori Miyoshi Kazuhiko Terashima Hideo Kitagawa Department of Production System Engineering Toyohashi University of Technology Toyohashi Japan Department of Electronic Control Engineering Gifu National College of Technology Gifu Japan

It is difficult for a novice rider to navigate an omni-directional wheelchair through a narrow space such an elevator door or a path along the wall because it is always necessary to keep in mind the width of the vehicle. Such navigation can produce stress in the operator. In those cases, a navigation guidance system that appeals to human's sensation of touch can be useful. In this paper, a novel navigation guidance system using a haptic feedback joystick is proposed for the omni-directional wheelchair. The present navigation guidance system adopts a force feedback joystick in order to induce the operator to evade obstacles.

关键词： Navigation Haptic interfaces Wheelchairs Force feedback Space technology Elevators Space vehicles Stress Project management control systems

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Optical and radio probing of lightning-associated phenomena in the atmosphere and ionosphere

Optical and radio probing of lightning-associated phenomena ...

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SICE Annual Conference

作者： T. Asano Y. Matsudo T. Suzuki Y. Hobara M. Hayakawa Department of Electronic Engineering University of Electro-Communications Chofu Tokyo Japan Air Force Defense Fuchu Tokyo Japan Department of Automatic Control and System Engineering Sheffield University UK

ISBN: (纸本)9784907764296

The monitoring and/or sounding of lightning discharges and their associated phenomena (mesospheric optical emissions etc.) has been performed by radio and optical measurements. We pay attention to the winter lightning in the Hokuriku area (Japan Sea side) of Japan, because it is extremely important to investigate whether lighting discharges in the Hokuriku area (whole spatial scale is relatively small in comparison with the conventional summer lightning in the US) could trigger the mesospheric optical emissions. The optical observation of those mesospheric emissions and the corresponding radio sounding by ELF and VHF radio waves of their parent lightning, have been reported. The observing systems are firstly presented, and our latest observational facts on the mesospheric emissions in the Hokuriku area, their parent lightning and some computer simulations on the sprite initiation, are presented.

关键词： Lightning Mesospheric emissions Optical measurement Radio measurement

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Simple efficient techniques for creating effective 3D impressions from 2D original images

Simple efficient techniques for creating effective 3D impres...

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Signal Processing Algorithms, Architectures, Arrangements and Applications (SPA)

作者： Julian Balcerek Adam Dąbrowski Adam Konieczka Department of Computing Science and Management Chair of Control and System Engineering Division of Signal Processing and Electronic Systems Poznan University of Technology Poznan Poland

In this paper simple techniques based on nonlinear geometric transformations are presented for creating an effective 3D impression (stereovision or illusion of depth) from a single 2D original. Our aim is to propose semi-automatic ways to transform 2D images into their suggestive but plausible 3D anaglyph versions. Three conversion methods based on a binary depth map are proposed and the influence of various RGB component shifts on the 3D impression quality is studied.

关键词： Image color analysis Three dimensional displays Materials Cameras Image segmentation Convergence

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Adaptive predictive approach for emergency voltage control of power networks

Adaptive predictive approach for emergency voltage control o...

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IEEE/PES Transmission and Distribution Conference and Exposition: Latin America

作者： S. Leirens J. Buisson Electronic and Electrical Engineering Department Universidad de Los Andes Bogota Colombia Supélec IETR Hybrid System Control Group Cesson-Sevigne France

In this paper, power networks are considered as hybrid non-linear dynamical systems for dealing with emergency voltage control. A hybrid approach based on a symbolic off-equilibrium linearized model and predictive con... 详细信息

关键词： Mathematical model Power system dynamics Power systems Load modeling Generators Equations Predictive models

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Group key management method based on tree-shape architecture in Wimax network

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Dongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Southeast University (Natural Science Edition) 2008年第SUPPL. 1期38卷 200-203页

作者： Pan, Shaoming Gu, Yonghao Yang, Yatao Ji, Yichao Department of Electronic Information and Control Engineering Guangxi University of Technology Liuzhou 545006 China Information Security Center State Key Laboratory of Networking and Switching Beijing University of Posts and Telecommunications Beijing 100876 China State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong University Beijing 100044 China

To improve the security and applicable capability of the group key management in 802.16e standard, the traditional group key management mechanism is discussed and the current security solutions for group key management in WiMax is analyzed. By using key tree and one-way function, an improved tree-shape group key management scheme is proposed, and the key updating process during node joining in or leaving Wimax network is also designed. Analysis result shows that, compared with the conventional method of logical key hierarchy (LKH), the proposed scheme has better performance in key storage, key updating and key calculation cost, which provides an effective solution for group key management in Wimax network and has better application value.

关键词： Network security

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Multi-target controller of three-level NPC based VSC-HVDC transmission system and Its RTDS simulation

Multi-target controller of three-level NPC based VSC-HVDC tr...

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IEEE International Conference on Sustainable Energy Technologies, ICSET

作者： Jianhua Zhang Sheng Li Jingfu Shang Weiwei Zhao Chunye Li Department of Electrical Engineering the School of Electrical and Electronic Engineering North China Electric Power University Beijing China Key laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education Beijing China College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China

This paper builds the dynamic mathematic model of the three-level Neutral Point Diode Clamped (NPC) converter, discusses the fundamental principles of the active and reactive power control for three-level Voltage Source Converter based HVDC (VSC-HVDC) system. To fully utilize the controllability of VSC-HVDC, multi-target controller is developed to control AC and DC system respectively. Improved sine wave PWM (ISPWM) technique is designed to raise the DC voltage utility rate. Real time digital simulation (RTDS) is done to verify the validity of the proposed control strategy and controllers and demonstrate the good performance of VSC-HVDC.

关键词： Converters Power conversion control systems Pulse width modulation Mathematics Mathematical model Power system modeling Diodes Reactive power control HVDC transmission

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Directional Diversity Reception for Hierarchically Modulated T-DMB system

Directional Diversity Reception for Hierarchically Modulated...

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IEEE Conference on Vehicular Technology (VTC)

作者： Jaehwui Bae Youngsu Kim Ju-Yeun Kim Jongsoo Lim Soo In Lee Dong-Seog Han Digital Broadcasting System Research Department of ETRI(electronics and telecommunications research institute) Daejeon Republic of Korea South Korea Dept. Electronic and Electrical Engineering of Kyungpook National University Daegu Republic of Korea South Korea

We propose a reception improvement method for OFDM based DQPSK-QPSK hierarchical modulation system in severe multipath channels using directional diversity. In an OFDM based transmission system with DQPSK modulation, data rate can be increased with hierarchical modulation by adding new QPSK signal to existing DQPSK signal. New added QPSK signal has much smaller amplitude compared with the existing QPSK signal to reduce the influences on the existing DQPSK signal, so the reception performance of new added QPSK signal is degraded when there are severe multipaths interferences due to small amplitude. To overcome this problem, the directional diversity is suggested. By applying directional diversity, we can eliminate undesired multipaths and change the reception channel characteristics near to frequency flat fading, so improve reception performance. We demonstrate the performance of proposed method under severe multipath channel and show it can improve the reception of new added QPSK signal.

关键词： Modulation Phase shift keying Bit error rate Mobile communication Diversity reception Signal to noise ratio Arrays

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control of Formations of UAVs for Surveillance and Reconnaissance Missions

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IFAC Proceedings Volumes 2008年第2期41卷 5161-5166页

作者： T. Kopfstedt M. Mukai M. Fujita C. Ament Research and Development Diehl BGT Defence GmbH und Co. KG 88662 Ueberlingen Germany (Tel: +49-7551-892875 Department of Electrical and Electronic Systems Engineering Kyushu University Fukuoka 819-0395 Japan Department of Mechanical and Control Engineering Tokyo Institute of Technology Tokyo 152-8552 Japan System Analysis Group Technical University of Ilmenau 98693 Ilmenau Germany

This paper presents a method for control of formations of Unmanned Aerial Vehicles (UAVs) in urban environments with several obstacles. Therefore the trajectories for each UAV are planned using mixed integer quadratic programming (MIQP) to describe a minimization problem. The result of this minimization problem then characterizes a collision free trajectory for each UAV using the commanded formations to fulfil the missions. The description of the UAVs, the inter UAV collision avoidance, the collision avoidance with obstacles as well as the description of formations will be shown in detail together with some simulation results in this paper. In addition the introduction explains the fields of interest in such formations of UAVs and what kind of advantage they can bring in comparison to today's solutions. The novelty in the approach in this paper is the description of formations of UAVs used in combination with MIQP to change formations, to add additional UAVs into an existing formation and to split formations, simply by changing some parameters in the description of the formation.

关键词： Autonomous systems Description of Formation Flights Hybrid systems Optimal control Mixed Integer Quadratic Programming

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Novel HV circuit breaker reliability testing measure based on image processing

Novel HV circuit breaker reliability testing measure based o...

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2008 Joint International Conference on Power system Technology POWERCON and IEEE Power India Conference, POWERCON 2008

作者： Guiyan, Cui Shutao, Zhao Chenguang, Zhao Baoshu, Li Department of Electric and Electronic Engineering School of North China Electric Power University Baoding 071003 Hebei Province China Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control Ministry of Education North China Electric Power University Baoding 071003 Hebei Province China North China Electric University China

ISBN: (纸本)9781424417629

Aimed at the difficulty of sensors installation in high-voltage (HV) circuit test experiment, a novel image processing based measure is put forward to detect the mechanical parameters. Through the on-off action images were captured by digital camera with the HV circuit breaker switching, the moving contact travel parameter can be calculated from image analyzing. At the meantime, the necessary timing or interval parameter can be calculated by the electrical signal processing. So most of other key mechanical characteristic parameters, include moving contactor trip, average velocity, bounce frequency, switching time-consuming and over-travel etc., can be also derived associated with the moving travel parameter and time-signal set. It is a non-contact measurement method, which can instead of grating sensor installed on the HV circuit breaker. Experiments result that this new method can obtain the HV circuit breaker mechanical parameter accurately, and it can increase the testing automatic level greatly. © 2008 IEEE.

关键词： Travel time

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