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2008 International Symposium on Applications and the Internet, SAINT 2008

作者： Vaidya, Binod Pyun, Jae-Young Pan, Sungbum Ko, Nak-Yong Dept. of Electronics and Computer Eng. Tribhuvan University Kathmandu Nepal Dept. of Information and Communication Eng. Chosun University Kwangju Korea Republic of Dept. of Control Instrumentation and Robot Eng. Chosun University Kwangju Korea Republic of

ISBN: (纸本)9780769532974

With the increasing demand of ubiquitous computing, the interconnection of mobile ad hoc networks (MANETs) to Internet is also getting attractive, which is so-called hybrid or connected MANET. In MANET paradigm, routing is a challenging task due to mobility and the resulting inherent dynamic network topology. In many applications, multipath routing scheme is favorable than single-path routing due to many advantages. Security issues in hybrid MANET, however, is still challenging task. There are two critical issues for providing a secure multihop route discovery: Internet connectivity and ad hoc routing. In this paper, we present architecture framework for secure hybrid multipath MANET that can provide global connectivity. We provide security analysis by using BAN Logic. © 2008 IEEE.

关键词： Mobile ad hoc networks

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Navigation of mobile robots using 6DOF SLAM accelerated by leveled maps

Navigation of mobile robots using 6DOF SLAM accelerated by l...

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2007 Int. Conf. on Telecommunications and Networking, TeNe 2007, 2007 Int. Conf. on Industrial Electronics, Technology and Automation, IETA 2007, Part of the Int. Jt. Conf. on Computer, Information, and Systems Sciences, and engineering, CISSE 2007

作者： Jez, Ondrej Dept. of Control and Instrumentation Faculty of Electrical Engineering and Communication Brno University of Technology Kolejni 2906/4 Brno 612 00 Czech Republic

ISBN: (纸本)9781402087363

This article is presenting a method for simultaneous localization an mapping (SLAM) of mobile robots in unknown environments. The method is using 3D range data which are acquired from a continuously inclined laser time of flight ranging sensor. In order to accelerate existing computational time-demanding Iterative Closest Point SLAM methods, the SLAM procedure is using a leveled map of the environment created from the 3D data which serves as a pre-estimation of the optimal translation and rotation in three degrees of freedom. This can eliminate the number of iterations of the final robust six degrees of freedom (6DOF) ICP registration, thus saving a lot of computational time. The criteria of the success of this method are the characteristics of the environment, especially the way the environment is structured, and the appropriate setting of the leveled map extraction. Results from the testing of the method in indoor environment are also presented. © Springer Science+Business Media B.V. 2008.

关键词： Mobile robots

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Precise measurement of wireless network roaming functionality and network component parameters applied for automation systems

Precise measurement of wireless network roaming functionalit...

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3rd International Conference on Systems, ICONS 2008

作者： Kadlec, Jaroslav Beran, Jan Vrba, Radimír Dept. of Microelectronics Brno University of Technology Faculty of Electrical Engineering and Communication Technologies Brno Czech Republic Dept. of Control and Instrumentation Brno University of Technology Faculty of Electrical Engineering and Communication Technologies Brno Czech Republic

ISBN: (纸本)9780769531052

The contemporary wireless networks in use have to solve problems with moving wirelessly connected devices. Such devices can move inside a one wireless network cell or across the several ones in the frame of one network or even from the one network to another. The conventional wireless connection types were designed for providing basic roaming functionality. The same functionality can be used in automation wireless networks. Main problems of roaming in automation networks especially in time-critical applications are speed of roaming procedure, and security of roaming procedure. Automation systems are very sensitive to packet losses and time delays in the communication. Securing of communication link during roaming is also required. Roaming speed goes directly against security level and it's very important to specify requirements of possible automation applications to maximum time delay and minimum security level. Roaming process and time consumption of its particular procedures is in detail described and measured in this paper. Based on required parameters to maximum roaming delay time and security level should be selected optimal compromise between these two parameters. The chapter below is focused on the roaming functionality available in WLANs, their main features, basic principles and concrete testing of these important parameters. © 2008 IEEE.

关键词： Wireless networks

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Local positioning system for human tracking

Local positioning system for human tracking

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2nd International Convention on Rehabilitation engineering and Assistive Technology, i-CREATe 2008

作者： Paluecha, Nakarin Tangamchit, Poj Dept. of Control Systems and Instrumentation Engineering King Mongkut's University of Technology Thonburi 126 Prachautit Rd. Bangmod Tungkru Bangkok 10140 Thailand

ISBN: (纸本)9789810803681

We propose a local positioning system that tracks human's movement. The system uses two 3-axis accelerometers mounted at the human's feet to detect steps. An electronic compass is used to obtain an absolute heading. Both step and heading data are combined to plot a movement trajectory on a building floor map based on the dead reckoning method. The system is tested by tracking a closed-loop walking trajectory: starting from a room, walking to another room about 20 meters away, and walk back to the starting point in the first room. The result shows about 2 meters accumulated error from the starting point.

关键词： Indoor positioning systems

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The isolated multilevel inverter using common-arm scheme for 3-phase system

The isolated multilevel inverter using common-arm scheme for...

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7th International Caribbean Conference on Devices, Circuits and Systems, ICCDCS

作者： Sung, Geun Song In, Hyuk Lee Park, Sung-Jun Hae, Kon Nam Kang, Feel-Soon Jun Sung Elect. Co. Ltd. Gwangju Korea Republic of Department of Electrical Engineering Chonnam National University Gwangju Korea Republic of Dept. of Control and Instrumentation Engineering Hanbat National University Daejeon Korea Republic of

ISBN: (纸本)9781424419579

For 3-phase applications, an isolated multilevel inverter employing 3-phase transformers can reduce the number of transformers compared with that of using single-phase transformers. However it needs a large number of switches. To solve this problem, we propose a modified 3-phase isolated multilevel inverter adopting common-arm scheme. Phase angle control based on equal-area method is presented to obtain optimal switching functions identified with fundamental frequency of output voltage. Thanks to this control strategy, harmonic components of output voltage and switching losses can be diminished considerably. To verify performance of the proposed multilevel inverter, we implemented computer-aided simulations. ©2008 IEEE.

关键词： Electric inverters

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Practical approaches to low-order anti-windup compensator design: a flight control comparison

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IFAC Proceedings Volumes 2008年第2期41卷 14162-14167页

作者： Murray L. Kerr Matthew C. Turner Ian Postlethwaite Control and Instrumentation Research Group Dept. of Engineering Univ. of Leicester Leicester LE1 7RH UK

This paper considers three different methods for low-order anti-windup (AW) compensator design and compares their application to a realistic flight control problem, where the dominant actuator nonlinearity is aileron rate saturation. The compensator design methods all rigorously enforce at least local exponential stability via absolute stability results, but differ in both the construction of the AW compensator itself and the performance requirements used in the design. In particular, the paper compares a low order AW “optimal” design method in which the compensator poles and zeros are chosen by the designer and the accompanying gains synthesised optimally; a new low order method in which the optimisation procedure optimally chooses both the zeros and the gains; and a recently introduced classical design method where loopshaping is used to completely determine the gains and dynamics of the compensator. The methods are compared using a high-order nonlinear model of the lateral dynamics of an experimental aircraft, on which similar compensators have recently been flight tested.

关键词： Anti-windup Asymptotic stabilization LMIs QFT Aerospace applications

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NEURO BASED MODEL REFERENCE ADAPTIVE control OF A CONICAL TANK LEVEL PROCESS

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control AND INTELLIGENT SYSTEMS 2008年第1期36卷 98-6页

作者： Bhuvaneswari, N. S. Uma, G. Rangaswamy, T. R. Crescent Engineering College Chennai India Power Electronics Division Anna University Chennai India Dept. of Instrumentation and Control Engineering Crescent Engineering College Chennai India

This paper deals with the adaptive control of a continuous time non-linear system of conical tank level process using neural networks. An adaptive system based on MRAC technique is proposed and proved to be useful in adjusting the trained parameter of the neural network for approximating the non-linearity of the dynamical system and for the process parameter variations. A neuro model is also developed for this purpose. The weight adaptive laws are developed using an adaptive neural network. The tracking error, which is the difference between the neuro model and the plant output, converge to the required accuracy through the adaptive control algorithm derived by combining the inverse neural network and adaptive neural network. A lab scale experimental setup for the conical tank level process was fabricated. Experimental studies were carried out for conventional control, fuzzy control, neuro control, and adaptive neuro control. The performances of all the above schemes were investigated. The advantages of the proposed scheme, over other methods, were highlighted.

关键词： Non-linear process conical tank conventional controller neurocontroller fuzzy controller neuro based MRAC

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Intelligent avr control using hybrid optimization based on bacterial foragiung and clonal selection

Intelligent avr control using hybrid optimization based on b...

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9th International Symposium of Hungarian Researchers on Computational Intelligence and Informatics, CINTI 2008

作者： Kim, Dong Hwa Cho, Jae Hoon Dept. of Instrumentation and Control Eng. Hanbat National University 16-1 San Duckmyong-Dong Yuseong-Gu Daejon City 305-719. Korea Republic of School of Electrical and Electronic Engineering Chungbuk National University 12 Gaesin-Dong Cheong-Ju Chungbuk361-763 Korea Republic of

This paper suggests novel hybrid optimization system (BF-CL) based on the bacterial foraging and clonal selection of immune system. A foraging strategy involves finding a patch of optimal condition (e.g., group of objective with conditions), deciding whether to enter it and search for optimal conditions, and when to leave the patch. There are predators and risks, energy required for optimization, and physiological constraints (sensing, memory, cognitive capabilities). Foraging scenarios can be modeled and optimal policies can be found using, for instance, dynamic programming. This approach provides us with novel hybrid model based on foraging behavior and clonal selection for a higher running time and with also a possible new connection between evolutionary forces in social foraging and distributed nongradient optimization algorithm design for global optimization over noisy surfaces for control system.

关键词： Hybrid systems

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Extensive Operation Support Functions using Process Computer System for Nuclear Power Plants

Extensive Operation Support Functions using Process Computer...

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第二届21世纪和谐核电系统国际会议（ISSNP2008）

作者： Hiroyuki Kimura Nuclear Plant Control & Instrumentation Engineering Dept. Hitachi-GE Nuclear Energy Ltd.l-lSaiwai-cho3-chomeHitachi-shiIbaraki-ken317-0073 Japan

control and instrumentation in nuclear power plant should have high *** adopted a highly integrated digital control system in the ABWR(Advanced Boiling Water Reactor)making the HMIS(Human Machine Interface System)more useful and efficient,and expanding the scope of automatic operations during a normal plant start-up/shutdown and after *** a result,the operator's workload was *** addition,Hitachi has been strengthening support to the operators by the monitoring and diagnostic function and the fast data recall logging function by PCS(Process Computer System). This paper describes the improvement of HIMS and PCS operational Support Functions. *** HMIS design for enhancing operator performance *** unification and reassignment of CRT/FD monitoring and operation functions *** of rules for hierarchized screen navigation,presentation formats *** support functions for operators by PCS *** plant start-up/shutdown operation functions *** and diagnostic functions *** data recall logging function

关键词： Process Computer System(PCS) Human Machine Interface System(HMIS) Operation support functions by Process Computer System

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Minimisation of harmonics amplification due to resonance by relocation of capacitors using ADALINE on a DSP

Minimisation of harmonics amplification due to resonance by ...

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International Conference on Computing, Communication and Networking, ICCCN

作者： K.R. Valluvan A. Vetrivel A.M. Natarajan Jovitha Jerome Department of Information Technology Kongu Engineering College Erode India Department of Electrical and Electronics Engineering Institute of Road and Transport Technology Erode India Dept. of Electronics & Communication Engineering Bannari Amman Institute of Technology Sathyamangalam India Department of Instrumentation and Control Systems Engineering PSG College of Technology Coimbatore India

Nonlinear loads produce current harmonics. The harmonic current flowing through the nonzero impedance of the electrical network, produce harmonics in supply voltage. Harmonics in power systems cause many ill effects and economic losses. To minimise the losses, IEEE: 519- 1992 has specified limits on voltage and current harmonics. Inductive loads like induction motors produce lagging power factor of less than unity. Capacitors are often used to improve the power factor by adding them in shunt with inductive loads. When high frequency harmonic currents flow through the network, due to the combination of inductive and capacitive loads (which are linear), resonance occurs. This causes an amplification of harmonics. Consequently, the increased harmonics affect the linear loads and produce more losses. This paper explains the results of harmonics measurements by a class of neural network, ADALINE implemented on a digital signal processor. Measurements were carried out when capacitors were grouped in one place and after their relocation nearer to the linear loads. The results show that, relocation of capacitors have minimised both voltage and current harmonics significantly. This methodology is very economical since it does not require any additional equipment for filtering of harmonics.

关键词： Resonance Capacitors Digital signal processing Power system harmonics Power harmonic filters Voltage Power generation economics Reactive power Impedance Power system economics

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