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检索条件"机构=Advanced Computer Systems Engineering Laboratory"

共 1539 条记录，以下是1411-1420 订阅

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A New Family of 2-D Optical Orthogonal Codes for Optical CDMA Access Networks

A New Family of 2-D Optical Orthogonal Codes for Optical CDM...

引用

Asia-Pacific Conference on Communications

作者： Sun Shurong Yin Hongxi Xu Anshi National Laboratory on Local Fiber-Optic Communication Networks & Advanced Optical Communication Systems School of Electronics Engineering and Computer Science Peking University Beijing China

ISBN: (纸本)0780391322

A new family of 2-D OOC, PC/OOC, for use in optical CDMA access networks is proposed in this paper. Analysis of its auto-and-cross correlation property is given and proof of that its cardinality achieves the upper bound in theory is presented. In contrary to previously constructed codes, PC/OOC exhibits the characteristics that the construction algorithm is simple and the number of wavelengths is optional which makes PC/OOC truly applicable to OCDMA networks as multi-access codes and greatly facilitates the operation of OCDMA

关键词： Optical fiber networks Multiaccess communication High speed optical techniques Upper bound Optical fiber communication Bandwidth Bit rate Telecommunication traffic Access protocols Design methodology

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Achieving fast fault detection and localization in all-optical networks

Achieving fast fault detection and localization in all-optic...

引用

National Fiber Optic Engineers Conference, NFOEC 2005

作者： Zeng, Hongqing Huang, Changcheng Vukovic, Alex Michel Savoie, J. Advanced Optical Network Laboratory Department of Systems and Computer Engineering Carleton University 1125 Colonel By Drive Ottawa ON K1S 5B6 Canada Communications Research Centre Canada 3701 Carling Avenue Ottawa ON K2H 8S2 United States

Fault detection and localization is critical for all-optical networks. In this paper after a review of the history and recent advancement on this topic, we proposed an end-to-end fault detection mechanism based on mon... 详细信息

ISBN: (纸本)1557527849

关键词： Fault detection

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2 × 2 RF MEMS switch matrix

2 × 2 RF MEMS switch matrix

引用

作者： McErlean, E.P. Hong, J.-S. Tan, S.G. Wang, L. Cui, Z. Greed, R.B. Voyce, D.C. Department of Electrical Electronic and Computer Engineering Heriot-Watt University Edinburgh EH14 4AS United Kingdom Central Microstructure Facility Rutherford Appleton Laboratory Didcot United Kingdom Advanced Technology Research Centre BAE Systems Chelmsford Essex CM2 8HN United Kingdom

The authors report on the recent development of a 2 × 2 RF MEMS switch matrix for high power applications. The RF design and modelling of the switch matrix using full-wave electromagnetic (EM) simulations are described. The method of fabrication and experimental setup are presented. Results for the recorded RF performance for on and off states are presented. Power handling characteristics of the switch are also examined. Some challenging issues for the development of this type of device are addressed.

关键词： Microelectromechanical devices

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Transport performance of an all-optical metro WDM network based on dynamic all-optical switches

Transport performance of an all-optical metro WDM network ba...

引用

National Fiber Optic Engineers Conference, NFOEC 2005

Transport performance is studied to assess the feasibility of four research facilities connected within metro WDM network. In particular, the dynamic wavelength switching is evaluated by tracking key network performan... 详细信息

ISBN: (纸本)1557527849

关键词： Optical switches

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Five-phase interior permanent magnet motor with low torque pulsation

Five-phase interior permanent magnet motor with low torque p...

引用

Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： L. Parsa H.A. Toliyat Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA Advanced Electric Machines & Power Electronics Laboratory Department of Electrical Engineering Texas A and M University College Station TX USA

High torque pulsation is the major disadvantage of most IPM motor configurations. Choosing proper number of stator slots and winding distribution as well as increasing number of phases are among the possible solutions for reducing torque pulsation. In this paper, five-phase interior permanent magnet motor with fractional-slot stator is studied. It is shown that despite other IPM motors; the proposed five-phase IPM motor with fractional slot has a very low torque pulsation. For comparison purposes, a five-phase IPM motor with 20 stator slots which is a common configuration for four pole five-phase motors is also considered. It is shown that the torque pulsation of the proposed fractional-slot five-phase IPM motor is much lower than the five-phase IPM motor with 20 stator slots. Nonlinear finite element method is used to analyze different machine configuration. A prototype four pole, five-phase IPM motor with 15 stator slots has been built and is used for experimental verification.

关键词： Permanent magnet motors Torque Reluctance motors Rotors Forging Stator windings Magnetic flux Induction motors Inverters Power engineering computing

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Field Weakening Operation of High Torque Density Five-Phase Permanent Magnet Motor Drives

Field Weakening Operation of High Torque Density Five-Phase ...

引用

IEEE International Conference on Electric Machines and Drives (IEMDC)

作者： L. Parsa N. Kim H.A. Toliyat Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA Department of Electrical Engineering Advanced Electric Machines & Power Electronics Laboratory Texas A and M University College Station TX USA

This paper investigates the field weakening operation of a five-phase permanent magnet motor. The proposed motor has concentrated windings such that the produced back-EMF is almost trapezoidal. The motor is supplied with the combined sinusoidal plus third harmonic of currents. This motor, while generating the same average torque as an equivalent permanent magnet brushless DC motor, overcomes its disadvantages. It is shown that torque producing and flux producing components of current for this motor can be decoupled by using multiple reference frame transformation. Therefore, vector control is easily applicable to the motor. Field weakening algorithm is derived and implemented. This motor benefits from high torque density of a BLDC motor below the rated speed and controllability of PMSM above the rated speed and during the field weakening region. Simulation and experimental results are provided to prove the validity of the superior performance of this drive

关键词： Torque Permanent magnet motors Brushless DC motors Synchronous motors DC motors Brushless motors Stator windings Wounds Machine vector control Controllability

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Challenge and progress in high power MEMS switches for reconfigurable RF front-ends

Challenge and progress in high power MEMS switches for recon...

引用

International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications (MAPE)

作者： J.-S. Hong E.P. McErlean S.G. Tan Y.-H. Chun Z. Cui L. Wang R.B. Greed D.C. Voyce Department of Electrical Electronic & Computer Engineering Heriot-Watt University Edinburgh UK Rutherford Appleton Laboratory Central Microstructure Facility Didcot UK Advanced Technology Research Centre BAE Systems Chelmsford UK

This paper reports the latest progress in developing advanced RF MEMS switches that are able to handle high RF power. Recent results of electromagnetic designs, electromechanical modelling, micromachining fabrication ... 详细信息

关键词： Microswitches Radio frequency Switches Radiofrequency microelectromechanical systems Communication switching Switching circuits Laboratories Microwave devices Microstructure Power system modeling

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Method of Multistage Mixing Speech Signals for the Real-Time Multimedia systems

Method of Multistage Mixing Speech Signals for the Real-Time...

引用

IEEE International Workshop on Intelligent Data Acquisition and advanced Computing systems: Technology and Applications

作者： A. Melnyk T. Korkishko R. Shevchuk Computer Engineering Department Lviv Polytechnic National University Lviv Ukraine Systems and Security Technology Group Communications and Networks Laboratory Samsung Advanced Institute of Technology Suwon South Korea Computer Science Department Ternopil State Economic University Ternopil Ukraine

In this work we offered the method of multistage mixing which allows the mixing speech samples on the measure of receipt of data blocks in mixer, and also mixing speech samples that was got from decompression of compr... 详细信息

关键词： Speech Real time systems Multimedia systems Protocols computer networks Signal generators Conferences Intelligent networks Data acquisition Application software

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Electromechanical modelling of high power RF-MEMS switches with ohmic contact

Electromechanical modelling of high power RF-MEMS switches w...

引用

European Conference on Microwave

作者： S.G. Tan E.P. McErlean J.-S. Hong Z. Cui L. Wang R.B. Greed D.C. Voyce Department of Electrical Electronic and Computer Engineering Heriot-Watt University Edinburgh UK Central Microstructure Facility Rutherford and Appleton Laboratory Didcot UK Advanced Technology Research Centre BAE SYSTEMS Chelmsford Essex UK

This paper presents a study of the behaviour of electrically actuated RF-MEMS switches with ohmic contact. We discuss about the relationship between the actuation voltage, displacement and the corresponding contact force experienced by the switch. We demonstrate the linear behaviour of the switch when factors such as width or length of the switch arm are varied. Experimental results for DC actuation are also presented.

关键词： Radiofrequency microelectromechanical systems Ohmic contacts Communication switching Power semiconductor switches Laboratories Voltage Micromechanical devices Space technology Silicon Power engineering computing

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Electromechanical modelling of high power RF-MEMS switches with ohmic contact

Electromechanical modelling of high power RF-MEMS switches w...

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European (Formerly European Gallium Arsenide and Other Semiconductors Application Symposium - EGASS) Microwave Integrated Circuit Conference (EuMIC)

作者： S.G. Tan E.P. McErlean J.-S. Hong Z. Cui L. Wang R.B. Greed D.C. Voyce Department of Electrical Electronic and Computer Engineering Heriot-Watt University Edinburgh UK Rutherford Appleton Laboratory Central Microstructure Facility Didcot UK BAE SYSTEMS Advanced Technology Research Center Chelmsford Essex UK

This paper presents a study of the behaviour of electrically actuated RF-MEMS switches with ohmic contact. We will discuss about the relationship between the actuation voltage, displacement and the corresponding contact force experienced by the switch. We will demonstrate the linear behaviour of the switch when factors such as width or length of the switch arm are varied. Experimental results for DC actuation are also presented.

关键词： Ohmic contacts Radiofrequency microelectromechanical systems Communication switching Power semiconductor switches Laboratories Voltage Micromechanical devices Space technology Silicon Power engineering computing

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