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Frontiers in Education (FIE) Conference

作者： N.A. Pendergrass G. Sun Department of Electrical and Computer Engineering University of Massachusetts Dartmouth USA Engineering Program University of Massachusetts Boston USA

This paper describes how computer assisted, collaborative learning techniques can be used to improve distance learning courses which use two-way compressed video. With these methods, students spend most of their class time working in groups on problems or interactive demonstrations. The approach provides an active learning experience and sharply reduces the amount of information which must be sent through the video system. The methods also increase interaction between students and the instructor and raise student motivation to overcome obstacles in the course. This paper also discusses many of the practical issues that are involved in distance education for classes using either collaborative learning or lecture based methods.

关键词： Collaborative work Distance learning Video compression Linear systems computer aided instruction Cameras Sun electrical engineering Digital filters Filtering

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Performance and uniformity of phased-array waveguide grating WDMS with wavelength comb self-alignment

Performance and uniformity of phased-array waveguide grating...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Wenhua Lin Chau-Han D. Lee Y.J. Chen D.R. Stone Department of Computer Science and Electrical Engineering and Joint Program for Advanced Electronic Materials University of Maryland

Wavelength division multiplexing (WDM) is emerging as one of the dominant technologies for future optical networks.

ISBN: (纸本)0780341252

Wavelength division multiplexing (WDM) is emerging as one of the dominant technologies for future optical networks.

关键词： Wavelength division multiplexing Optical crosstalk Arrayed waveguide gratings Optical waveguides Optical fiber networks Testing Optical switches Phased arrays Optical arrays Temperature

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PROPERTIES OF SIMULATED ANNEALING AND GENETIC ALGORITHMS FOR MAPPING DATA TO MULTIcomputerS

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Parallel Algorithms and Applications 1997年第4期12卷 279-296页

作者： Nashat Mansour[a] Jalal Kawash[a] Hassan Diab[b] [a] Lebanese American University Computer Science Program Beirut Lebanon [b] American University of Beirut Electrical Engineering Dept. Beirut Lebanon

We experimentally analyze some properties of simulated annealing algorithms (SA) and genetic algorithms (GA) for mapping data to multicomputers. These properties include sensitiviiy to user parameters, fault tolerance capability, and applicability to different multicomputer topologies. Some user parameters are included in the objective function and are architecture- or problem-dependent parameters. The others are used in the GA and SA algorithms. The fault tolerance capability is demonstrated by mapping data to a multicomputer with some faulty processors. We assume a hypercube multicomputer architecture in most experiments. However, mapping to mesh, array, ring, tree, and star graph topologies is also demonstrated. The experimental results show that the GA and SA are insensitive to user parameters in wide ranges, completely fault tolerant, and unbiased towards particular multicomputer topologies. These properties of flexibility and general applicability, which are lacking in other heuristic algorithms, make the GA and SA attractive for automatic parallelization systems.

关键词： automatic parallelization data mapping load partitioning and balancing scheduling parallelizing compilers

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Photonic integrated eight-wavelength 2/spl times/2 WDM crossconnect switch using phased-array waveguide grating multi/demultiplexers

Photonic integrated eight-wavelength 2/spl times/2 WDM cross...

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Optical Fiber Communication (OFC) Conference

作者： Haifeng Li Chau-Han Lee Wenhua Lin S. Didde Yunglui Chen D. Stone Department of Computer Sciences and Electrical Engineering Joint Program for Advanced Electronic Materials University of Maryland Baltimore Baltimore MD USA

A wavelength-division multiplexing (WDM) cross-connect switch (WDM-CCS), which can switch arbitrary wavelength components between different input signals, is a key component for WDM networks. In the paper, we report a monolithically integrated eight-wavelength 2/spl times/2 WDM-CCS with 200 GHz channel spacing. The switch is transparent to signal format and bit rate and can be widely used in multiwavelength scalable and reconfigurable WDM networks for dynamic wavelength routing.

关键词： Wavelength division multiplexing Optical waveguides WDM networks Optical switches Laboratories Optical interferometry Phased arrays Wavelength measurement Acoustic signal detection Solids

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computer-aided design of magnetostrictive devices using Terfenol-D

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EUROPEAN TRANSACTIONS ON electrical POWER 1997年第5期7卷 351-359页

作者： Benbouzid, MEH Spornic, SA Body, C [?]Dr. Mohamed El Hachemi Benbouzid (1968) SEE received the B.Sc. degree in Electrical Engineering in 1990 from the Electrical Engineering Institute of Batna University Algeria the MSc. degree in Electrical and Computer Engineering in 1991 from the National Polytechnic Instituteof Grenoble France and the Ph.D. degree also in Electrical and Computer Engineering in 1994 from the National Polytechnic Institute of Grenoble. After graduation he joined the University of Picardie-Jules Verne France where he is Associate Professor at the Professional Institute of Amiens. His currentresearch interests include electric machines anddrives computational of electromagnetics and electromechanical actuation as well as technics for energy savings. He is actually leading a research program on the monitoring and the diagnostics of induction machine drives for the French Picardie Region. He is active in the IEEE Power Engineering Society and is the treasurer of the French Chapter of the IEEE Power Electronics Society. (Laboratoire des Systkmes Automatique Universitk de Picardie-Jules Verne 7. Rue du Moulin Neuf. F-80000 Amiens France Phone: + 33 22 827680 Fax: + 33 22 82 76 82

This paper describes a model for the non-linear magnetomechanical coupling in new highly magnetostrictive materials. This model is devoted to the computer-Aided Design of magnetostrictive devices. It is based on an iterative process of successive magnetic and mechanical computations by a the Finite Element Method. Magnetic and mechanical quantities are still coupled by the iterative process. As a matter of fact, the use of experimental data though the Surface Spline Method allows the introduction of the magnetomechanical coupling. The experimental data are collected from a specially designed sample holder devoted to the static characterization of Terfenol-D rods. Comparisons between numerical outputs from the model and the experimental data reveal that the model is quite powerful to describe the magnetomechanical coupling in highly magnetostrictive materials as Terfonal-D. Otherwise, the proposed model has been extended to take into account the magnetostrictive effect in microsystems using highly magnetostrictive thin films. Numerical computations provide in this case coherent results and show that it is able to describe the global behaviour of highly magnetostrictive microsystems.

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Photoluminescence from GaN implanted with isoelectronic phosphorus and bismuth

Photoluminescence from GaN implanted with isoelectronic phos...

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IEEE International Symposium on Compound Semiconductors

作者： W.M. Jadwisienczak H.J. Lozykowski School of Electrical Engineering & Computer Science and Condensed Matter & SurfaceSciences ProgramStocker Center Ohio University Athens OH USA

Photoluminescence spectra, excitation spectra and decay kinetics of epitaxial GaN layers grown by MOCVD on sapphire substrates and implanted by isoelectronic impurities P and Bi were investigated. Post implant annealing up to 1150/spl deg/C, and different duration time was done in a tube furnace under flowing NH/sub 3/ or N/sub 2/ using proximity cap method to recover implantation damages. The PL of GaN:P shows strong emission peaked at 423 nm-428 nm with modulated structures that depend on annealing condition. The PL of GaN: Bi shows luminescence transitions, observable in a wide temperature range from 9 K to 300 K. Further, we develop the luminescence models that describe the recombination and quenching processes.

关键词： Photoluminescence Gallium nitride Bismuth Annealing Luminescence Kinetic theory MOCVD Substrates Impurities Implants

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The shape from motion approach to rapid and precise force/torque sensor calibration

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JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME 1997年第2期119卷 229-235页

作者： Voyles, RM Morrow, JD Khosla, PK Robotics Ph.D. Program Carnegie Mellon University Pittsburgh PA 15213-3891 Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA 15213

We present a new technique for multi-axis force/torque sensor calibration called shape from motion. The novel aspect of this technique is that it does nor require explicit knowledge of the redundant applied load vectors, yet it retains the noise rejection of a highly redundant data set and the rigor of least squares. The result is a much faster, slightly more accurate calibration procedure. A constant-magnitude force (produced by a mass in a gravity field) is randomly moved through the sensing space while raw data is continuously gathered. Using only the raw sensor signals, the motion of the force vector (the ''motion'') and the calibration matrix (the ''shape'') are simultaneously extracted by singular value decomposition. We have applied this technique to several types of force/torque sensors and present experimental results for a 2-DOF fingertip and a 6-DOF wrist sensor with comparisons to the standard least squares approach.

关键词： Torque Calibration Gravity (Force) Signals Noise (Sound) Stress Shapes Sensors

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Performance analysis of hypothesis testing for pairwise interaction point processes

Performance analysis of hypothesis testing for pairwise inte...

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Asilomar Conference on Signals, Systems & computers

作者： J.A. Gubner Wei-Bin Chang M.M. Hayat Department of Electrical & Computer Engineering University of Wisconsin Madison WI USA Electro-optics Graduate Program University of Dayton Dayton OH USA

The sufficient statistic for the likelihood ratio test between pairwise interaction point processes is well-known. However, the evaluation of its performance is a challenging problem. In this paper it is shown that the distribution of the sufficient statistic can be approximated by the distribution of a Poisson-driven shot-noise random variable. This latter distribution can be readily computed using numerical methods.

关键词： Performance analysis Testing Statistical distributions Statistical analysis Random variables Distributed computing Error analysis Environmental factors Forestry Biological system modeling

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Anticontrol of chaos via feedback

Anticontrol of chaos via feedback

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IEEE Conference on Decision and Control

作者： Guanrong Chen Dejian Lai Department of Electrical and Computer Engineering University of Houston Houston TX USA Program of Biometry School of Public Health University of Texas Houston Houston TX USA

ISBN: (纸本)0780341872

In this paper, a simple control method that combines a linear state-feedback with a nonlinear mod-operation is proposed for making an arbitrarily given, deterministic, discrete-time dynamical systems chaotic. The given system can be arbitrary in the sense that it can be either linear or nonlinear, lower or higher-dimensional, asymptotically stable, unstable, or chaotic. The resulting controlled system is chaotic in the sense that the controlled map (1) has sensitive dependence on initial conditions, (2) is topologically transitive, and (3) has a dense set of periodic points.

关键词： Chaos Feedback Control systems Inductors Fluid dynamics Heating Public healthcare Nonlinear control systems Physics Mathematics

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Electron multipactor code for high-power RF devices

Electron multipactor code for high-power RF devices

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IEEE Conference on Particle Accelerator

作者： S. Humphries D. Rees Department of Electrical and Computer Engineering University of New Mexico Albuquerque NM USA APT Program Los Alamos National Laboratory Los Alamos NM USA

We have developed an integrated software system, TrakRF, to model electromagnetic fields and charged particle orbits in high-power RF devices. Our primary application is simulation of electron multipactoring near RF vacuum windows for the APT (Accelerator Production of Tritium) program. In this paper we describe features of the codes and initial multipactor calculations for superconducting cavity arrays. The finite-element frequency-domain solver can determine resonant modes in cavities and waveguides. TrakRF directly determines power dissipation and phase shifts in lossy materials. In addition, the program handles scattered waves in open structures with free-space boundaries based on matched termination layers. TrakRF has advanced particle tracking capabilities to investigate a variety of innovative window designs. The program can simultaneously apply three independent solutions for electrostatic, magnetostatic and RF fields. The finite-element methods allow an accurate representation of electron collisions with surfaces.

关键词： Radio frequency Finite element methods Software systems Electromagnetic modeling Electromagnetic fields Orbits Application software Particle accelerators Electron accelerators Production

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