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Student Conference on Research and Development (SCOReD)

作者： M. F. N. Tajuddin N. H. Ghazali M. F. Mohammed B. Ismail Z. M. Isa T. C. Siong N. Ghazali School of Electrical System Engineering Universiti Malaysia Pedis Perlis Malaysia Faculty of Computer Science and Information Technology Universiti Teknologi Malaysia Johor Malaysia

ISBN: (纸本)9781424451869;9781424451876

This paper presents the programming and use of TMS320F2812 digital signal processor (DSP) in generating the digital pulse width modulation (DPWM). The structure and functions of eZdsp 2812 board used in this work is explained briefly and the steps need to be taken for the programming is explain in detail to control the frequency, the duty cycle and dead band of the generated PWM. The PWM generated by DSP from programming can be used to control and regulate power electronic converters.

关键词： Digital signal processors Digital signal processing Pulse width modulation Pulse generation Signal generators Space vector pulse width modulation Digital modulation Modulation coding Functional programming Frequency

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New method of DOA Estimation for Coherent Sources Under Unknown Noise Field

New method of DOA Estimation for Coherent Sources Under Unkn...

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2009 9th International Conference on Electronic Measurement & Instruments(第九届电子测量与仪器国际会议 ICEMI'2009)

作者： Zenggang Wang Shujing Su Jinglong YAN School of Electronics and Computer Science and Technology North University of ChinaShanxi 030051Ch North China System Engineering Institute Beijing 100089China

ISBN: (纸本)9781424438631;9781424438624

the major shortcomings of the MUSIC algorithm for direction-of-arrival (DOA) are that it performs poorly when the sources are highly and when the noise is unknown. A method was proposed to estimate DOA for coherent, noncoherent, and mixed narrowband signals under an unknown spatially noise environment, in this method, the forward-backward spatial smoothing algorithm was employed to decorrelate highly correlated sources and increase data amount, and a covariance matrix difference between the forwardbackward spatial smoothing for covariance matrix of the received data and its transform matrix was introduced to eliminate noise components from the array structure, then, the MUSIC spectral was constructed by eigenvalue decomposition the difference to estimate DOA of signal sources. The numerical result verified that the method is effective.

关键词： direction-of-arrival coherent sources forward-backward spatial smoothing MUSIC algorithm.

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Fast Reroute upon Multi-homed Domains Link Failures

Fast Reroute upon Multi-homed Domains Link Failures

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International Conference on computer and Information science (ACIS)

作者： Hailong Ma Yunfei Guo Jianwei Zhang National Digital Switching System Engineering and Technological Research and Development Center Zhengzhou China School of Computer Science and Communication Engineering Zhengzhou University of Light Industry Zhengzhou China

As more and more mission critical services emerge on the Internet, there is a growing demand for the Internet to provide stringent service availability and reliability. More and more domains adopt multi-homed connection to expect increasing reliability. But the de facto inter-domain protocol - BGP spends a long period to converge to another stable state when one of the links of multi-homed domain fails. The delayed convergence of BGP deteriorates the performance of time stringent services. In this paper, we propose a fast reroute approach, called Fremd, to react quickly to multi-homed domain link failures so as to perform non-stop routing. Through simulation we demonstrate that Fremd is more resilient to multi-homed domain link failures and the scale of exchanged messages and route table size due to the deployment of Fremd is acceptable.

关键词： Mission critical systems Web and internet services Reliability engineering Protocols Convergence computer network reliability Telecommunication network reliability Scalability IEEE news Information science

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Load Balancing Routing Algorithm for Ad Hoc Networks

Load Balancing Routing Algorithm for Ad Hoc Networks

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International Conference on Mobile Ad-hoc and Sensor Networks, MSN

作者： Wenbin Jiang Zhaojing Li Chunqiang Zeng Hai Jin Services Computing Technology and System Laboratory School of Computer Science and Technology Huazhong University of Science and Technology Wuhan China Department of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan China

In ad hoc networks, when the load is heavy, the performance of on-demand routing protocols, such as DSR protocol, will suffer large degradation. For instance, the absence of balanced distribution of network flow among nodes in the whole network is highly prone to producing heavy-load key nodes. This results in fast energy consumption of these key nodes, and finally decreasing the survival time of the network caused by their premature failures. To address this problem, a novel algorithm called cross-layer based load balancing algorithm for DSR (CLB-DSR) is proposed. In CLB-DSR, the cross-layer strategy is adopted to exchange the information between data link layer and network layer. Simulation results show that the improved routing protocol using CLB-DSR can effectively balance network load, improve the network throughput and reduce the end-to-end delay, the rate of data dropped.

关键词： Load management Ad hoc networks Routing protocols Energy consumption Delay effects Storms Mobile computing Sensor systems Clustering algorithms computers

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A simple and accurate measurement of fiber time delay in free-running linear-cavity laser configuration

A simple and accurate measurement of fiber time delay in fre...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Lingling Chen Meng Zhang Yue Cai Chun Zhou Zhigang Zhang Institute of Quantum Electronics State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing China

A simple, convenient and accurate technique for measurement of time delay in fiber by using a free-running linear-cavity laser is demonstrated. The uncertainty of time delay was in the order of 10 -7 ~ 10 -6 .

ISBN: (纸本)9781424438303

关键词： Time measurement Delay effects Fiber lasers Frequency measurement Laser mode locking Erbium-doped fiber lasers Laser theory Optical fiber testing Optical fiber communication Length measurement

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Ultra-low repetition rate all-normal-dispersion linear-cavity mode-locked fiber lasers

Ultra-low repetition rate all-normal-dispersion linear-cavit...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Meng Zhang Lingling Chen Chun Zhou Yue Cai Zhigang Zhang Institute of Quantum Electronics State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing China

We demonstrate the long linear-cavity with ultra-low repetition rate Ytterbium-doped fiber laser mode-locked by a SESAM. Output pulses were highly-chirped, with energies high to 75.2 nJ and minimum repetition rate was... 详细信息

ISBN: (纸本)9781424438303

关键词： Fiber lasers Laser mode locking Optical fiber polarization Optical fiber communication Ring lasers Optical fiber couplers Optical pulses Laser stability Semiconductor lasers Pump lasers

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Phase shift compensation of high modulation depth multi-layer InGaAs/InAlAs SESAM

Phase shift compensation of high modulation depth multi-laye...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Lingling Chen Meng Zhang Yue Cai Chun Zhou Ling Ren Zhigang Zhang Institute of Quantum Electronics State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing China

A new InGaAs/InAlAs multi-layer design of broadband SESAM including precise phase shift compensation is proposed. Simulation demonstrates a uniform modulation depth up to 25% for the wavelength from 1000 to 1080 nm.

ISBN: (纸本)9781424438303

关键词： Phase modulation Indium gallium arsenide Indium compounds Reflectivity Absorption Laser mode locking Fiber lasers Laser theory Semiconductor lasers Solid lasers

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Wind Farm Reactive Power Output Optimization for Loss Reduction and Voltage Profile Improvements

Wind Farm Reactive Power Output Optimization for Loss Reduct...

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第六届IEEE国际电力电子与运动控制会议 (2009 IEEE 6th International Power Electronics and Motion Control Conference-ECCE Asia

作者： C.L.Zhang J.J.Zhao X.Li J.P.Lu J.T.Hao State Key Laboratory of Transmission & Distribution Equipment and Power System Safety and New Techno School of Optical-Electrical and Computer Engineering University of Shanghai for Science and Technol

In recent years, the number of small size wind farms used as DG sources located within the distribution system are rapidly increasing. In this paper, wind farm made up with doubly fed induction generators (DFIG) is proposed as the continuous reactive power source to support system voltage control due to the reactive power control capability of DFIG. The particle swarm optimization (PSO) is utilized to find wind farm optimal reactive power output for distribution system losses reduction and voltage profiles improvement. Finally, the three feeder distribution system is used as a test case to evaluate the algorithm.

关键词： Wind farms Reactive power Reactive power control Induction generators Voltage control Wind energy generation Rotors Wind turbines Power system modeling Optical computing

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The stability of high-order cohen-grossberg neural networks

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Journal of Information and Computational science 2009年第3期6卷 1647-1652页

作者： Lei, Jingsheng Yan, Ping Lv, Teng School of Computer and Information Engineering Shanghai University of Electric Power Shanghai 200090 China College of Mathematics and System Science Xinjiang University Urumqi 830046 China Teaching and Research Section of Computer Artillery Academy Hefei 230031 China

In this paper, we study the stability of high-order Cohen-Grossberg neural networks with delays and reaction-diffusion terms. Some sufficient conditions are given to ensure the existence, uniqueness and globally exponential stability of the equilibrium point to the high-order Cohen-Grossberg neural networks. 1548-7741/ Copyright © 2009 Binary Information Press.

关键词： Diffusion in liquids

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Ultra-low repetition rate SESAM-mode-locked linear-cavity erbium-doped fiber laser

Ultra-low repetition rate SESAM-mode-locked linear-cavity er...

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Pacific Rim Conference on Lasers and Electro-Optics (CLEO/Pacific Rim)

作者： Lingling Chen Meng Zhang Chun Zhou Yue Cai Ling Ren Zhigang Zhang Institute of Quantum Electronics State Key Laboratory of Advanced Optical Communication System and Networks School of Electronics Engineering and Computer Science Peking University Beijing China

We investigated linear-cavity with ultra-low repetition rate Erbium-doped fiber laser mode-locked by a high modulation depth SESAM. Output pulses were highly-chirped, at energy up to 14 nJ and minimum repetition rate ... 详细信息

ISBN: (纸本)9781424438303

关键词： Erbium-doped fiber lasers Laser mode locking Optical fiber polarization Optical pulses Optical fiber communication Laser stability Fiber lasers Laser theory Pulse amplifiers Ring lasers

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