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Mediterranean Conference on Embedded Computing (MECO)

作者： Mirko Kosanovic Mile Stojcev Modem computer technology Technical College of Professional Studies Nish Serbia Faculty of Electronic Engineering University of Nish Nish Serbia

Wireless Sensor Networks (WSNs) represent a set of tiny, inexpensive sensor nodes (SNs). The main source of power supply of SN is usually battery, which has a strictly limited capacity. Lifetime of SN is crucial parameter for energy-efficient applications in WSN. The need for power management becomes the main task intended for SN's lifetime extension. In this paper we present a modified rendezvous scheme based on implementation of duty-cycling technique. The proposed scheme provides synchronous wake-up times of SNs in fully decentralized way and fast detection of new appended SN. Taking into account working parameters, such as beacon time, duty cycling factor, and quartz oscillator instability, by using the proposed method, a WSN designer can determine with high accuracy the maximal number of active SNs within a WSN, and the optimal beacon period, i.e. to achieve optimal energy efficient application for the WSN.

关键词： Collision avoidance

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Matlab/GUI based basic design principles of PID controller in AVR

Matlab/GUI based basic design principles of PID controller i...

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2013 4th International Conference on Power engineering, Energy and Electrical Drives, POWERENG 2013

作者： Bayram, M. Baha Bülbül, H. Ibrahim Can, Celal Bayindir, Ramazan Department of Electrical-Electronic Technology Battalgazi Vocational High School 06320 Ankara Turkey Department of Computer Education Faculty of Industrial Arts Education Gazi University 06830 Ankara Turkey Department of Technical Programs Vocational Collage of Haci Bektas Nevsehir University 50800 Nevsehir Turkey Electrical and Electronics Engineering Dept. Faculty of Technology Gazi University 06500 Ankara Turkey

ISBN: (纸本)9781467363921

AVR (Automatic Voltage Regulator) is a part of the synchronous generator and it is responsible for regulating the reactive power and voltage level under normal operating terms at different load levels. The modeled system composed of the amplifier, exciter, sensor and proportional-integral-derivative (PID) controller. In order to model the system state space method is used. Also, their specifications and behaviors are discussed briefly. Simulation of the AVR system is carried out on the interface developed by Matlab GUI and the results are presented. The generator terminal voltage step responses are estimated by studying the controller parameters. In this paper, a system using Ziegler-Nichols (ZN) method as a tuning method for determining the parameters of PID control for an AVR system is proposed. Also the transient stability of AVR system with PID parameters change is proposed. © 2013 IEEE.

关键词： Synchronous generators

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Hybrid vibration energy harvester based on piezoelectric and electromagnetic transduction mechanism

Hybrid vibration energy harvester based on piezoelectric and...

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IEEE Conference on Clean Energy and technology (CET)

作者： Mohd Fauzi Ab Rahman Swee Leong Kok Noraini Mat Ali Rostam Affendi Hamzah Khairul Azha A. Aziz Faculty of Engineering Technology Universiti Teknikal Malaysia Melaka Durian Tunggal Melaka Malaysia Faculty of Electronic and Computer Engineering Universiti Teknikal Malaysia Melaka Faculty of Engineering Technology Universiti Teknikal Malaysia Melaka - Kampus Bandar Ayer Keroh Melaka MY

Vibration energy harvester converts kinetic energy from ambient vibration into electrical energy. Many energy harvesters in the literature use single element transducer, either piezoelectric, electromagnetic or electrostatic for above purpose. In this paper, a hybrid based energy harvester that integrates with both, piezoelectric and electromagnetic transducers is developed and examined. The energy harvester uses four pole magnets arranged onto a piezoelectric cantilever beam free end, to produce stronger magnetic field over a stationary coil. When the harvester is excited by an external vibration, both piezoelectric and electromagnetic generates electrical energy or power. Experimental results shows that piezoelectric capable to generate optimum power of 2.3mW in a 60Ω resistive load, while electromagnetic generates 3.5mW power in a 40Ω resistive load, when vibrated at its resonant frequency 15Hz, and at 1g (1g=9.8ms -2 ) acceleration. By efficiently integrating both piezoelectric and electromagnetic transducers, more power could be generated as compared to a single transducer over its size.

关键词： Vibrations Transducers Magnetomechanical effects Coils Resonant frequency Magnetic flux

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Characterization of CdMnTe radiation detectors using current and charge transients

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Journal of Semiconductors 2013年第7期34卷 19-25页

作者： R.Rafiei M.I.Reinhard A.Sarbutt S.Uxa D.Boardman G.C.Watt E.Belas K.Kim A.E.Bolotnikov R.B.James Australian Nuclear Science and Technology Organisation Lucas HeightsNSW2234Australia School of Electrical Electronic and Computer EngineeringThe University of Western AustraliaCrawleyWA6009Australia Faculty of Mathematics and Physics Institute of PhysicsCharles UniversityKe Karlovu 5Prague 2CZ-12116Czech Republic Brookhaven National Laboratory UptonNY 11973USA Department of Radiologic Science Korea UniversitySeoul136-703Korea

Charge transport characteristics of Cd_（0.95）Mn_（0.05）Te：In radiation detectors have been evaluated by combining time resolved current transient measurements with time of flight charge transient *** shapes of the measured current pulses have been interpreted with respect to a concentration of net positive space-charge, which has resulted in an electric field gradient across the detector *** the recorded current pulses the charge collection efficiency of the detector was found to approach 100%.From the evolution of the charge collection efficiency with applied bias,the electron mobility-lifetime product ofμ_nτ_n =（8.5±0.4）×10^（-4） cm^2/V has been *** electron transit time was determined using both transient current technique and time of flight measurements in the bias range of 100-1900 *** the dependence of drift velocity on applied electric field the electron mobility was found to beμ_n =（718±55） cm^2/（V·s） at room temperature.

关键词： radiation detector CdMnTe CMT detector fabrication transient current technique time of flighttechnique

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A Service-Oriented Mobile Social Networking Platform for Disaster Situations

A Service-Oriented Mobile Social Networking Platform for Dis...

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Annual Hawaii International Conference on System Sciences (HICSS)

作者： Xiping Hu Victor C.M. Leung Weichang Du Boon-Chong Seet Panos Nasiopoulos Department Electrical and Computer Engineering University of British Columbia Canada Faculty of Computer Science University of New Brunswick Canada Department Electrical and Electronic Engineering Auckland University of Technology New Zealand

This paper proposes a novel service-oriented mobile social networking platform called MS2A for disaster situations. MS2A consists of two layers: service layer and application layer. The service layer is implemented based on the service-oriented architecture (SOA) to ease application developments. By extending and composing the web services at this layer, application developers can efficiently and flexibly develop different new functions or applications for mobile disaster rescue and recovery applications. The application layer is oriented to mobile users and it integrates with functions of mobile social networks. With dynamic and automatic service collaboration support, it enables people to easily collaborate and help each other through their mobile devices in disaster situations. The results of our experiments and demonstration examples given in the paper show the feasibility and desired functionality of MS2A for relieving disaster situations with mobile devices.

关键词： Mobile handsets Mobile communication Ad hoc networks Service-oriented architecture Mobile computing Social network services

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Design of Low Input and High Output Impedance Current-mode Biquad Filter Using CDTAs with Independent Control of Quality Factor and Pole Frequency

Design of Low Input and High Output Impedance Current-mode B...

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International Symposium on Communications and Information Technologies

作者： Somsak Sattanaco Winai Jaikla Piya Supavarasuwat Wipobh Jaikhang Electrical Communication Engineering Faculty of Industrial Education King Mongkut's Institute of Technology Ladkrabang Bangkok 10520Thailand Program in electronic & Computer Engineering Faculty of Industrial Technology Chiangrai Rajabhat University Chiangrai 57100 Thailand

ISBN: (纸本)9781467355797

In this study, a single-input multiple-outputs current-mode analog biquadratic filter, based on current differencing transconducatance amplifier (CDTA) is presented. The proposed filter uses two CDTAs, one resistor and two grounded capacitors, which is well suited for integrated circuit implementation. The circuit simultaneously gives 3 standard transfer functions, namely, lowpass, highpass and bandpass filters with independent control of quality factor and pole frequency by electronic method. By summing of IHP and ILP, the notch filter can be also achieved. Moreover, the circuit possesses low input and high output impedance which would be an ideal choice for current-mode cascading. The PSPICE simulation results are included verifying the workability of the proposed filter. The given results agree well with the theoretical anticipation.

关键词： current-mode CDTA filter integrated circuit analog circuit

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Observer-based finite-time control for discrete fuzzy jump nonlinear systems with time delays

Observer-based finite-time control for discrete fuzzy jump n...

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American Control Conference

作者： Yingqi Zhang Peng Shi Sing Kiong Nguang Hamid Reza Karimi College of Science Henan University of Technology School of Electrical and Electronic Engineering The University of Adelaide Department of Electrical and Computer Engineering University of Auckland Department of Engineering Faculty of Engineering and Science University of Agder

ISBN: (纸本)9781479901777

This paper investigates the problem of observer-based finite-time H_∞ control for a family of discrete jump nonlinear systems with time delays represented by Takagi-Sugeno (T-S) model. The main contribution of this paper is to design an observer-based finite-time H_∞ controller such that the resulting closed-loop system is stochastic finite-time bounded and satisfies a prescribed H_∞ disturbance attenuation level over the given finite-time interval. Sufficient criteria on stochastic finite-time H_∞ stabilization via observer-based fuzzy state feedback are provided for the solvability of the problem, which can be tackled by a feasibility problem in terms of linear matrix inequalities. A simulation example is presented to illustrate the validity of our contributions.

关键词： system clock jump Fuzzy computability Standing Orders Controllers

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DWDM bidirectional wavelength reuse optical wireless transmission in 2×80 Gbit/s capacity

DWDM bidirectional wavelength reuse optical wireless transmi...

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International Workshop on Optical Wireless Communications

作者： H. Y. Hsu W. C. Lu H. Le Minh Z. Ghassemlooy Y. L. Yu S. K. Liaw Department of Electronic and Computer Engineering National Taiwan University of Science and Technology Taipei Taiwan Faculty of Engineering and Environment Northumbria University Newcastle upon Tyne United Kingdom

We demonstrate a practical 2×80 Gbit/s dense wavelength division multiplexing (DWDM) bidirectional short-range optical wireless link. The measured power penalty for the bidirectional transmission is less than 0.8 dB compared to the back-to-back link and is only 0.2 dB compared to the unidirectional transmission system. This technology may find potential applications for building-to-building and/or indoor communications.

关键词： Optical fiber communication Optical fibers Optical transmitters Optical receivers High-speed optical techniques Optical attenuators

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Estimation of nonstationary harmonic signals and its application to active control of MRI noise

Estimation of nonstationary harmonic signals and its applica...

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

作者： Maciej Niedźwiecki Michał Meller Yoshinobu Kajikawa Dawid Łukwiński Faculty of Electronics Telecommunications and Computer Science Department of Automatic Control Gdańsk University of Technology Gdansk Poland Department of Electrical and Electronic Engineering Faculty of Engineering Science Kansai University Suita Osaka Japan

A new adaptive comb filtering algorithm, capable of tracking the fundamental frequency and amplitudes of different frequency components of a nonstationary harmonic signal embedded in white measurement noise, is proposed. Frequency tracking characteristics of the new scheme are studied analytically, proving (under Gaussian assumptions and optimal tuning) its statistical efficiency for quasi-linear frequency changes. Laboratory tests show that the proposed algorithm can be successfully used for active control of MRI noise.

关键词： Noise Harmonic analysis Magnetic resonance imaging Adaptation models Signal processing algorithms Estimation Power harmonic filters

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Contributing parameters for magnetoresistance effect of the new design on Hall plate structure

Contributing parameters for magnetoresistance effect of the ...

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International Conference on Electrical engineering/electronics, computer, Telecommunications and Information technology, ECTI-CON

作者： T. Phetchakul P. Taisettavatkul W. Yamwong A. Poyai Electronic Department Faculty of Engineering King Mongkut's Institute of Technology Ladkrabang Bangkok Thailand Thai Microelectronics Center National Electronics and Computer Technology Center Chachoengsao Thailand

This paper presents the parameters which contribute magnetoresistance effect of the new design on Hall plate structure when it is compared with series resistance structure. The new design is designed with rectangular aluminum ring surrounding on Hall plate. It creates zero Hall voltage area which the carriers move and deflect freely. The new and classical designs have percentage of magnetoresistance effect about 20% at doping concentration 2 × 10 15 cm -3 , temperature 300 K at magnetic field 3 Tesla when classical one has metal space about 10 μm. The new design one is easier design than the classical series resistance and has no effect of metal space. Parameters which are used in this experiment are silicon and gallium arsenide at doping concentration 2 × 10 14 , 2 × 10 15 and 2 × 10 16 at temperature 200, 250 and 300 K with Sentaurus TCAD program for simulation. The new design has the percentage of magnetoresistance effect much higher up to 906% over than the classical series resistance when it is designed with high mobility material, low doping concentration and low temperature.

关键词： Magnetoresistance Resistance Doping Silicon Gallium arsenide Magnetic fields Aluminum

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