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2010 49th IEEE Conference on Decision and Control

作者： S. Sathananthan M. J. Knap L.H. Keel Department of Mathematics and Center of Excellence in Information Systems Tennessee State University Nashville TN 37209 USA Department of Electrical & Computer Engineering and Center of Excellence in Information Systems Tennessee State University Nashville TN 37209 USA

ISBN: (纸本)9781424477456

This paper presents a new approach to robust quadratic stabilization of nonlinear stochastic systems. The linear rate vector of a stochastic system is perturbed by a nonlinear function that satisfies a quadratic constraint. Our objective is to show how linear constant feedback laws can be formulated to stabilize this type of stochastic systems and, at the same time maximize the bounds on this nonlinear perturbing function which the system can tolerate without becoming unstable. The control input is simultaneously applied to both the rate vector and the diffusion term. The new formulation provides a suitable setting for robust stabilization of nonlinear stochastic systems where the underlying deterministic systems satisfy the generalized matching conditions. Examples are given to demonstrate the results.

关键词： stochastic systems Robust stability Nonlinear stochastic system control input nonlinear functions

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Robust Stability of Complex systems with Applications to Performance Attainment Problems

Robust Stability of Complex Systems with Applications to Per...

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American Control Conference

作者： M.J. Knap L.H. Keel S.P. Bhattacharyya Center of Excellence in Information Systems Tennessee State University Nashville TN 37209 USA Department of Electrical & Computer Engineering and Center of Excellence in Information Systems Tennessee State University Nashville TN 37209 USA Department of Electrical & Computer Engineering Texas A&M University College Station TX 77843 USA

ISBN: (纸本)9781424474264

Recently, a computationally efficient method was developed to deal with stability of a control system where the coefficients of the characteristic polynomial are polynomially dependent on the parameters of interest. In this paper, we extend this result to a family of complex polynomials which in turn solves some important performance attainment problems. This is due to the fact that a number of important performance attainment problems (phase margin, H_(infinity) margin, and SPR problem) can be cast as robust stability problems for complex polynomials. The results are illustrated by examples.

关键词： Robust stability Complex systems stability problems Characteristic polynomial control systems Polynomial phase margin

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Time-stepping finite-element analysis of dynamic eccentricity fault in a three-phase salient pole synchronous generator

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Progress In Electromagnetics Research B 2010年第20期 263-284页

作者： Faiz, J. Babaei, M. Nazarzadeh, J. Ebrahimi, B.M. Amini, S. Science and Research Branch Islamic Azad University Tehran Iran Shahed University Tehran Iran Center of Excellence on Applied Electromagnetic Systems School of Electrical and Computer Engineering University of Tehran Tehran Iran Niroo Research Institute Tehran Iran

In this paper, two-dimensional time-stepping -nite-element (TSFE) method is performed for modeling and analyzing of a salient pole synchronous generator with different degree of dynamic eccentricity (DE) fault. TSFE analysis is used to describe the influence of DE fault on the flux distribution within the generator and no-load voltage pro-les at low and high -eld current is obtained for healthy and faulty cases. Comparing the magnetic flux distribution of healthy and faulty generators helps to detect the influence of DE fault. Also, it can be seen at no-load condition with low excitation current, the effect of the eccentricity is considerable compared to that of the rated excitation current. Since the calculation of inductances of the machine is the most important step for fault analysis and diagnosis, the self- and mutual- inductances of the stator phases and rotor windings are calculated in the eccentric generator. Double periodic phenomenon is observedin inductances profile of stator phases due to the DE fault. Finally, spectrum analysis of stator current of two generators with different design parameters is used to diagnosis the significant harmonics in the presence of DE fault.

关键词： Inductance

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A sustainable data center with heat-activated cooling

A sustainable data center with heat-activated cooling

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Intersociety Conference on Thermal and Thermomechanical Phenomena in Electronic systems (ITHERM)

作者： Anna Haywood Jon Sherbeck Patrick Phelan Georgios Varsamopoulos Sandeep K. S. Gupta School of Mechanical Aerospace Chemical & Materials Engineering Arizona State University Tempe AZ USA National Center of Excellence on SMART Innovations Arizona State University Tempe AZ USA School of Computing Informatics and Decision Systems Engineering Computer Science and Engineering Arizona State University Tempe AZ USA

Technological and economic trends in data centers push toward facilities operated at higher ambient temperatures and at higher power densities to meet ever-increasing computational demands. Conventionally, data centers are cooled with vapor-compressor equipment which requires extra power to be driven. This paper proposes an alternative and sustainable data center cooling architecture that is heat driven. The thermal source is the heat produced by the data center room's equipment. A major challenge is providing both enough cooling to the data center and enough exergy to drive the cooling process, regardless of the thermal output of the data center equipment. This challenge is addressed by the use of organic heat storage and a sustainably powered (i.e. solar-powered) heat source, leading potentially to a PUE (Power Usage Effectiveness) value of less than one.

关键词： Cooling Space heating Heat pumps Data flow computing High performance computing Thermal loading Poles and towers Data engineering Energy storage Aerospace materials

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Panel — Models of entrepreneurship education and its role in increasing creativity, innovation and leadership in computer science and engineering students

Panel — Models of entrepreneurship education and its role i...

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Frontiers in Education (FIE) Conference

作者： Simona Doboli Wendy Tang Rajiv Ramnath John Impagliazzo Tim VanEpps Ankur Agarwal Rodrigo Romero Edward H. Currie Computer Science Department Director of Computing Entrepreneurship Hofstra University USA Electrical and Computer Engineering Director of Engineering and Technology Entrepreneurship minor and Faculty Director of Information and Technology Studies Stony Brook University USA Enterprise Institute for Sensing Systems (ISS) Department of Computer Science and Engineering Ohio State Uinversity USA Computer Science and Engineering Qatar University Qatar College of Engineering & Computer Science Florida Atlantic University USA Department of Computer Science and Engineering Florida Atlantic University USA Cyber-ShARE Center of Excellence University of Texas El Paso USA Computer Science Department Hofstra University and Resonance Publications USA

Creativity, innovation and leadership are among the essential attributes of future engineers as identified in the Engineer 2020 report by the National Academy of engineering. It is critical for students to have the ability to identify new needs and opportunities for technological innovation in highly complex and interdisciplinary domains. Historically, entrepreneurship has fueled innovation and the advent of many technological advances. Therefore, education in entrepreneurship for engineering or computing disciplines that complement strong analytical and technical skills, is likely to significantly enhance students' lifelong ability and desire to innovate. The goal of this panel is to discuss a number of education models in entrepreneurship, innovation, and leadership at different types of computing and engineering schools across the country and internationally, in order to identify common themes and effective components for such programs.

关键词： Educational institutions Innovation management Lead Technological innovation computer science

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Analysis of Dynamic Behavior of Switched Reluctance Motor-Design Parameters Effects

Analysis of Dynamic Behavior of Switched Reluctance Motor-De...

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IEEE Mediterranean Electrotechnical Conference

作者： Jawad Faiz Gh. Shahgholian H. Ghazizadeh Center of Excellence on Applied Electromagnetic Systems School of Electrical and Computer Engineering University of Tehran Department of Electrical Engineering Islamic Azad University

ISBN: (纸本)9781424457939

In the design of switched reluctance motor (SRM) and its drive, analysis and simulation of the dynamic behavior of the motor is essential. In the simulation process, model of the SRM and its controller is taken into account. In this paper motor characteristics are examined and effects of the motor design parameters, such as inductance, resistance and supply voltage, on the system response is studied. Variations of phase current and developed torque of the motor are predicted and discussed.

关键词： Switched reluctance motor Dynamic behavior Design parameters

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Terahertz detection using electro-optic effect in a ZnTe layered structure

Terahertz detection using electro-optic effect in a ZnTe lay...

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1st Conference on Millimeter-Wave and Terahertz Technologies, MMWaTT 2009

作者： Eshaghi, Armaghan Soltani, Amin Shahabadi, Mahmoud Center of Excellence on Electromagnetics Systems School of Electrical and Computer Engineering University of Tehran Iran

ISBN: (纸本)9781424468089

In this work, a layered structure of ZnTe slabs separated by air-gaps is used to detect terahertz pulses. The structure which can be considered as a periodic structure is operating close to its stop-band edge where the transmission of the optical signal is attenuated. Applying the terahertz signal will vary the refractive index of the ZnTe slabs of the periodic structure due to the electro-optic effect in ZnTe. Consequently, the stop-band will shift in the presence of the terahertz signal. Hence, the intensity of the transmitted optical signal is modulated by the terahertz pulse, thus the terahertz signal can be detected. To examine the performance of the proposed detector, a finite-difference time-domain (FDTD) analysis is employed so that the nonlinear processes involved in the ZnTe slabs can be taken into account rigorously. Performance of the proposed structure will be compared with that of the conventional detectors based on a single ZnTe layer. ©2009 IEEE.

关键词： Refractive index

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High efficiency silicon solar cells with ink jetted seed and plated grid on high sheet resistance emitter

High efficiency silicon solar cells with ink jetted seed and...

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2010 35th IEEE Photovoltaic Specialists Conference

作者： A. Ebong B. Rounsaville I. B. Cooper K. Tate A. Rohatgi S. Glunz M. Horteis A. Mette M. Gundermann Xjet School of Electrical and Computer Engineering Georgia Institute of Technology Atlanta GA USA University Center of Excellence for Photovoltaic Research and Education Georgia Institute of Technology Atlanta GA USA Fraunhofer Institute for Solar Energy Systems (ISE) Freiburg Germany Q-Cells OT Thalheim Bitterfeld-Wolfen Germany OT Thalheim Q Cells Bitterfeld-Wolfen Germany Xjet Limited Rehovot Israel

Fine and tall grid lines on high sheet resistance emitter can increase the efficiency of silicon solar cells by reducing the shadow loss and improving the blue response. However, current screen printing pastes are neither able to provide the adequate line geometry nor make good ohmic contact to high sheet resistance emitter. This paper uses a combination of inkjet printing and light induced plating of silver to solve both problems. The ink jetting of grid lines is used to write ~38 μm wide and ~4 μm tall seed lines. These grid lines grow to 65 μm wide and 20-25 μm tall after light induced plating of silver. The silver plating solution penetrates the entire contact region underneath the grid lines to reduce the PbO in the glass layer to Pb metal in addition to plating the silver crystallites underneath. This lowers the contact resistance. Prolonged plating builds the line height to reduce the line resistance. A combination of low contact and line resistances produced fill factor of 79.2% on 95-Ω/sq emitter. This resulted in 239-cm 2 Cz silicon solar cell efficiencies up to 18.7% with an average of 18.4%.

关键词： Lead

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Time-domain analysis of wavelength shift in a ZnTe slab due to electro-optic effect in THz

Time-domain analysis of wavelength shift in a ZnTe slab due ...

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1st Conference on Millimeter-Wave and Terahertz Technologies, MMWaTT 2009

作者： Mohamadi, Amin Soltani Shahabadi, Mahmoud Center of Excellence on Applied Electromagnetic Systems School of Electrical and Computer Engineering University of Tehran Tehran Iran

ISBN: (纸本)9781424468089

In this research, propagation of an optical signal through a ZnTe slab which shows electro-optic (EO) effect for terahertz frequencies is analyzed. We assume that the optical signal and the terahertz modulating signal are simultaneously present in the ZnTe slab. The slab is modeled by its nonlinear susceptibility in a one-dimensional Finite Difference Time Domain (FDTD) formulation. Using the FDTD analysis, we demonstrate that the optical signal will experience a frequency shift in the presence of the terahertz signal. The frequency shift predicted by this method of analysis is in agreement with a recently reported experiment. ©2009 IEEE.

关键词： Zinc compounds

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A novel analysis of rectangular dielectric waveguides using an interior-exterior integral equation technique

A novel analysis of rectangular dielectric waveguides using ...

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Asia-Pacific Conference on Microwave

作者： M. Radfar R. Faraji-Dana Center of Excellence on Applied Electromagnetic Systems School of Electrical & Computer Engineering University of Tehran Tehran Iran

In this paper, we apply a modified integral equation technique to analyze rectangular dielectric waveguides with elimination of spurious modes. The two stage method applies interior problem by modal analysis to access the electric field in the waveguide in terms of the electric field on the boundaries. The exterior problem can be solved by integral equation technique to calculate the boundary fields regarding to interior fields. Using this approach, the eigen value problem can be formulated by finding the zeros of the relating determinant. Eliminating the spurious modes, the zeros of each mode are distinctly distinguishable. The consequent dispersion diagram is also has good agreements with the results of other methods for rectangular dielectric waveguide.

关键词： Dielectrics Rectangular waveguides Integral equations Optical waveguides Electromagnetic waveguides Propagation constant Harmonic analysis Modal analysis Finite element methods Electromagnetic analysis

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