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SICE Annual Conference 2005

作者： Vibunjarone, Vichupong Prempraneerach, Yothin Control Engineering Department Research Center for Communication and Information Technology King Mongkut's Institute of Technology Ladkrabang Bangkok 10520 Thailand Electrical Engineering Department Vongchavalitkul University Nakhon-Ratchasima 3000 Thailand

This paper presents the integrated circuit combined with PI controller and the frequency to voltage converter (FVC) acting as the feedback part to be a closed-loop VCO circuit (CLVCO). The PI controller is designed by symmetrical optimum for optimum output response so as to minimize the effect of VCO noise. This closed loop circuit can achieve good frequency stability as well as good noise suppression. The experimental results show that CLVCO is independent from power supply variation and the frequency stability due to the effect of VCO noise or voltage drift which is greatly improved. © 2005 SICE.

关键词： Variable frequency oscillators

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A high frequency stability of VCO with dual feedback loop

A high frequency stability of VCO with dual feedback loop

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SICE Annual Conference 2005

This paper is purposed to improve the high frequency stability of the voltage controlled oscillator (VCO) with dual feedback loop. The proposed of closed loop VCO (CLVCO) is composed of PI controller in the forward part and in the feedback part the phase locked loop is used instead of a frequency to voltage converter (FVC) for some advantages, there is no need for a large frequency division element (1/N) in the feedback part. The other advantages of phase-locked loop is used as the feedback element, the high frequency bandwidth of a closed loop VCO is possibly designed. The CLVCO can greatly improved VCO characteristic such as faster speed response as well as higher operation bandwidth, to minimize the effect of the VCO noise and the power supply variation and also obtain better linearity of VCO output. The experimental results confirm the validity of the proposed CLVCO. © 2005 SICE.

关键词： Variable frequency oscillators

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Study on antenna radiation characteristics affected by Specific Anthropomorphic Mannequin

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WSEAS Transactions on communications 2005年第11期4卷 1203-1214页

作者： Huang, Sheng-Yi Chen, Shuang-Yuan Sun, Jwo-Shiun Institute of Mechatronic Engineering National Taipei University of Technology 1 Sec. 3 Chung-Hsiao E. Rd. Taipei 10608 Taiwan Institute of Computer Communication and Control National Taipei University of Technology 1 Sec. 3 Chung-Hsiao E. Rd. Taipei 10608 Taiwan

In this study, the assessment of Radio Frequency (RF) emission energy deposition and analysis of antenna radiation characteristics in Global System for Mobile communications (GSM) 1900 MHz were conducted. The dipole antenna was used to evaluate destruction of far-field radiation pattern as well as input impedance, which closed proximate Specific Anthropomorphic Mannequin (SAM). The location of SAM closed to dipole antenna was classified into three relevant position types. The purpose is to assess SAM effects on characteristics of dipole antenna. The electromagnetic (EM) emission energy harm degree of human head tissue was also evaluated. Here, the evaluation of scattering and power absorption were also made. Up to now, the evaluation of electromagnetic emission energy absorption degree of human head tissue is only done by using near-field environmental measurement. However, in this study, using far-field environmental measurement to assess RF emission energy deposition of human head tissue was adopted. Finally, in the numerical method, Finite-Difference Time-Domain (FDTD) was used to compare with experiment results.

关键词： Directional patterns (antenna)

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Evaluation of anti-fouling performance for ion-rod water treater with automatic dynamic simulator of fouling

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化工学报 2005年第4期56卷 668-671页

作者：孙灵芳杨善让秦裕琨徐志明 Power Engineering and Engineering Thermophysics Postdoctoral Workstation Harbin Institute of Technology Harbin 150001HeilongjiangChina Energy Conservation and Measurement-control Technique Research Center Northeast China Institute of Electric Power EngineeringJilin 132044JilinChina Power Engineering and Engineering Thermophysics Postdoctoral Workstation Harbin Institute of Technology Harbin 150001HeilongjiangChina

The application of a novel Automatic Dynamic Simulator of Fouling (ADSF) to evaluate the effectiveness of ion-rod water treater is *** effects of some parameters of the water treater were studied with an ADSF made according to patented technology, and orthogonal experimental design was adopted with the use of artificial hard *** results validated that the ion-rod water treater could mitigate fouling,and the anti-fouling efficiency varies with the test *** anti-fouling efficiency of treater increased with the increase of flow velocity in the range of 0.8—1.2 m·s -1 and output voltage in the range of 7500—15000 *** efficiency weat up initially, and then went down with the increase in *** rough surface of ion-rod was superior to the smooth *** order of influence on treater performance with respect to these factors was as follows: water hardness, roughness of surface, flow velocity and output *** research also provided a guide to improving the performance of ion-rod water treater.

关键词：污垢离子棒水处理器阻垢性能

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Nonlinear flow control based on a low dimensional model of fluid flow

Nonlinear flow control based on a low dimensional model of f...

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Symposium on Nonlinear control and Observer Design: From Theory to Applications, 2005

作者： King, Rudibert Seibold, Meline Lehmann, Oliver Noack, Bernd. R. Morzyński, Marek Tadmor, Gilead Measurement and Control Group Berlin University of Technology Germany Hermann-Föttinger-Institut Berlin University of Technology Germany Institute of Combustion Engines and Transportation Poznań University of Technology Poland Department of Electrical and Computer Engineering Northeastern University Boston United States

ISBN: (纸本)3540279385

Nonlinear control design is shown to be a critical enabler for robust model-based suppression of a flow instability. The onset of oscillatory vortex shedding is chosen as a well investigated benchmark problem of flow control. A low-dimensional Galerkin model using a Karhunen-Loève decomposition of the flow field is adopted from earlier studies of the authors as a control-oriented fluid flow representation. Several strategies of nonlinear controller design are employed, both, to the Galerkin model and to the flow via a direct numerical simulation of the Navier-Stokes equations (NSE). The aim is to find methods which respect the validity of low order models. Examples are formal methods such as input-output linearization, Lyapunov-based, backstepping controllers etc., and physically motivated controllers. Whereas the first test-bed is easily mastered by the formal methods, the application to the NSE is more critical, due to robustness issues. © Springer-Verlag Berlin Heidelberg 2005.

关键词： Navier Stokes equations

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Comparison common mode noise reducibility of full-bridge and buck converters for unidirectional DC motor drive

Comparison common mode noise reducibility of full-bridge and...

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SICE Annual Conference 2005

作者： Thanasana, S. Srisawang, A. Panaudomsub, S. Prempraneerach, Y. Department of Control Engineering Research Center for Communication and Information Technology King Mongkut's Institute of Technology Ladkrabang Bangkok 10520 Thailand Department of Electronic Engineering Faculty of Engineering Kasem Bundit University Bangkok 10250 Thailand Department of Electrical Engineering Faculty of Engineering Vongchavalitkul University Nakhon Ratchasima 30000 Thailand

An unidirectional speed control of dc motor is more appropriate in some condition for specific application which is usually used by either buck converter or an unipolar switching mode of full-bridge converter. This paper is purposed to compare the common mode noise reduction ability of both buck converter and an unipolar switching mode of full-bridge converter. This comparison will help the driver design engineer to correctly select the dc motor driver for application must worry about the noise factor. With regard to an electromagnetic interference (EMI) causing in general dc-dc converters is necessary to determine the essential parameters in the circuit such as the parasitic capacitances of heat sink, a switching noise, an unbalanced characteristic of a circuit and so on. The general buck converter for dc motor drive usually uses unbalanced circuit topology between sending and returning power line. The unbalanced buck converter will generate the common mode current to flow through the parasitic capacitance of heat sink to a frame ground or chassis. This paper is also purposed to illustrate the common mode noise reduction ability of a full-bridge converter for dc motor drive. The most significant specific characteristic of a full-bridge converter is the simultaneous switching on and off of the two switching devices (Q1 and Q2 or Q3 and Q4) which are performed in both bipolar switching mode and unipolar switching mode operation. When the two switching devices are simultaneous operated on and off which has a dc motor to be existing between their switching actions, such a simultaneous switched performance is illustrated the characteristic of the active noise cancellation at the dc motor terminals. In addition, due to the full-bridge converter circuit has a symmetrical scheme when the four parasitic capacitances of the heat sink are connected to the frame ground or chassis will provide more circuit balance. The circuit balance and active noise cancellation characteristi

关键词： DC motors

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Investigation of a phenylalanine-biosensor system for phenylketonuria detection

Investigation of a phenylalanine-biosensor system for phenyl...

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2005 27th Annual International Conference of the engineering in Medicine and Biology Society, IEEE-EMBS 2005

作者： Wang, Zhuo Chen, Ya-Zhu Zhang, Su Zhou, Zhen Biomedical Instrument Institute Shanghai Jiaotong University 1954 Huashan Rd. Shanghai 200030 China College of Measure-control Technology and Communication Engineering Harbin University of Science and Technology 52 Xuefu Rd. Harbin Heilongjiang 150080 China

ISBN: (纸本)0780387406

Detection and prevention of Phenylketonuria (PKU) is becoming more and more important. However, the current methods are either imprecise or time-consuming. We propose a biosensor system based on phenylalanine ammonia-lyase (PAL) immobilized on an ammonia electrode to measure blood phenylalanine for PKU prevention. The biosensor exhibits good linearity from 10-5000μM and the response time is only about 2 minutes. It remains stable for at least 5 days and less than 20% drop of the original activity after ten day storage at 4, while the service life of the biosensor could be up to 30 days. We also develop an intelligent system to ensure optimal conditions for operation and preservation of the biosensor and to make detection more convenient and reliable. All of these advantages indicate that the newly developed method could be a better one for solving the problems of PKU detection. © 2005 IEEE.

关键词： Biosensors

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Novel contour extraction algorithm for a moving target based on image fusion

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Guangdianzi Jiguang/Journal of Optoelectronics Laser 2005年第8期16卷 973-977页

作者： Zhao, Peng Cao, Jun Pu, Zhao-Bang Zhang, Tian-Wen Department of Automation Measurement and Control Harbin Institute of Technology Harbin 150001 China Mechanic and Electronic Institute Northeast Forestry University Harbin 150040 China Department of Computer Science and Engineering Harbin Institute of Technology Harbin 150001 China

A contour extraction algorithm for a moving target is proposed. This algorithm consists of three steps. Firstly, motion segmentation is applied respectively to infrared and visible image sequences to get an initial contour of a moving target. Secondly, a dynamic contour is applied to make the initial contour converge to the target's contour. Finally, two novel image fusions are applied. The first fusion minimizes L2 norm's square of the difference of control point vectors in two modal images without image registration. The second fusion is realized by the modified differential coupling with image registration. Contrasting detection experiments indicate the second fusion is better. Meanwhile, a fast iteration algorithm of dynamic contour based on the Newmark method is devised. A contrasting experiment indicates its iteration time for stable convergence decreases by 21.01% compared with the Wilson-θ method.

关键词： Object recognition

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Algorithm for circle subpixel location detecting based on point Hough transformation

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Guangxue Jishu/Optical Technique 2005年第SUPPL.期31卷 155-157页

作者： Chen, Shi-Zhe Pu, Zhao-Bang Liu, Guo-Dong Hu, Tao Qu, Yu-Fu Department of Automatic Measurement and Control Harbin Institute of Technology Harbin 150001 China School of Instrument Science and Photoelectric Engineering Beijing University of Aeronautics and Astronautics Beijing 100083 China

In order to improve location precision and speed of base circle in PCB (Printed Circuit Board) detecting, an algorithm for circle subpixel location detection was presented. At first, the edge points could be obtained from edge detecting the filtered image using canny operator, then the circle approximately position and its parameter could be gained through dealing with the edge points using point Hough transformation;secondly, the circle's edge points could be got through deleting big noise points according to the circle's parameter, then the circle's subpixel edge points could be obtained from subdividing the circle's edge points;finally the circle's precision location and its parameter could be obtained through fitting the circle's subpixel edge points using least square method. The experiments demonstrate that this algorithm can detect the base circle's subpixel location and its parameter. The center location precision is up to 0.5 pixel, and the radius detection precision is up to 0.3 pixel, and the speed is very high.

关键词： Circle detection Location PCB Point Hough transformation Subpixel

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A novel, psychophysically motivated transmission approach for haptic data streams in telepresence and teleaction systems

A novel, psychophysically motivated transmission approach fo...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： P. Hinterseer E. Steinbach S. Hirche M. Buss Institute of Communication Networks Media Technology Group Munich University of Technology Munich Germany Institute of Automatic Control Engineering Munich University of Technology Munich Germany

One of the key challenges in telepresence and teleaction systems is the fact that a global control loop is closed over a communication network. The transmission delay of haptic information is extremely critical. Therefore, new data samples from the haptic sensors are typically immediately forwarded to the receiver which leads to a large number of packets being generated when using the Internet as the communication infrastructure. We present a novel approach to reduce the number of packets and, therefore, the amount data communicated in a telepresence and teleaction system. Our method uses a passive deadband transmission approach which only delivers data packets over the network when the sampled sensor data changes more than a given threshold value. The threshold value is determined by psychophysical experiments. This approach leads to a considerable reduction (up to 90%) of packet rate and data rate without sacrificing the fidelity and immersiveness of the system.

关键词： Psychology Haptic interfaces control systems communication system control Delay Internet Humans Intelligent networks communications technology communication networks

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