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Guaranteed cost H∞ control of linear stochastic Markovian switching systems

Guaranteed cost H∞ control of linear stochastic Markovian s...

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

ISBN: (纸本)9783902661937

A problem of H∞-disturbance attenuation for uncertain discrete-time stochastic processes under Markovian switching and random diffusion (noise) subject to norm bounded parameter uncertainties is considered. The jump Markovian switching is modeled by a discretetime Markov chain. The control input is applied to the rate vector and the state dependent diffusion term is modeled by a normal sequence of identically independently distributed random variables. The objective is to design a switched state feedback control law that guarantees the asymptotic stability of the closed-loop system with disturbance attenuation level γ. The control law is found as a solution of a set of linear matrix inequalities (LMI's). © 2011 IFAC.

关键词： Stochastic systems

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The effect of dielectric spacer thickness on surface plasmon enhanced solar cells for front and rear side depositions

The effect of dielectric spacer thickness on surface plasmon...

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作者： Pillai, S. Beck, F.J. Catchpole, K.R. Ouyang, Z. Green, M.A. ARC Photovoltaics Centre of Excellence University of New South Wales Sydney NSW 2052 Australia Center for Sustainable Energy Systems College of Engineering and Computer Science Australian National University Canberra ACT 0200 Australia

The excitation of surface plasmons on metallic nanoparticles has the potential to significantly improve the performance of solar cells, in particular thin-film structures. In this article, we investigate the effect of the dielectric spacer layer thickness on the photocurrent enhancement of 2 m thick, thin-film poly-Si on glass solar cells, due to random arrays of self-assembled Ag nanoparticles deposited on the front or the rear of the cells. We report a strong asymmetry in the external quantum efficiency (EQE) of the cell for front and rear located particles for different spacer thicknesses, which is attributed to differences in the scattering behavior of the nanoparticles. We find that for random arrays, with spectrally broad scattering resonances, the strength of the driving field and the coupling efficiency are more important for light trapping than the resonance wavelength. For particles located on the front of the cells it is desirable to have a thin dielectric spacer layer to enhance the scattering from the Ag nanoparticles. Additionally, light trapping provided by the random sized particles on the front can overcome suppression of light transmitted in the visible wavelength regions for thin layers of Si, to result in overall EQE enhancements. However, for particles deposited on the rear it is more beneficial to have the particles as close to the Si substrate as possible to increase both the scattering and the coupling efficiency. © 2011 American Institute of Physics.

关键词： Silver nanoparticles

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Towards prognostics of electrolytic capacitors

Towards prognostics of electrolytic capacitors

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AIAA Infotech at Aerospace Conference and Exhibit 2011

作者： Celaya, José R. Kulkarni, Chetan Biswas, Gautam Goebel, Kai Prognostics Center of Excellence SGT Inc NASA Ames Research Center Moffett Field CA 94035 United States Institute for Software Integrated Systems Vanderbilt University Nashville TN 37235 United States Electrical Engineering and Computer Science Vanderbilt University Nashville TN 37235 United States Prognostics Center of Excellence NASA Ames Research Center Moffett Field CA 94035 United States

ISBN: (纸本)9781600869440

A remaining useful life prediction algorithm and degradation model for electrolytic capacitors is presented. Electrolytic capacitors are used in several applications ranging from power supplies on critical avionics equipment to power drivers for electro-mechanical actuators. These devices are known for their low reliability and given their criticality in electronics subsystems they are a good candidate for component level prognostics and health management research. Prognostics provides a way to assess remaining useful life of a capacitor based on its current state of health and its anticipated future usage and operational conditions. In particular, experimental results of an accelerated aging test under electrical stresses are presented. The capacitors used in this test form the basis for a remaining life prediction algorithm where a model of the degradation process is suggested. This preliminary remaining life prediction algorithm serves as a demonstration of how prognostics methodologies could be used for electrolytic capacitors.

关键词： Forecasting

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A new method for transient analysis of a dipole above a lossy ground using Quadratic B-Spline Temporal Basis Functions

A new method for transient analysis of a dipole above a loss...

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2011 13th International Conference on Electromagnetics in Advanced Applications, ICEAA'11

作者： Firouzeh, Z.H. Moini, R. Sadeghi, S.H.H. Faraji-Dana, R. Vandenbosch, G.A.E. Department of Electrical Engineering Amirkabir University of Technology 424 Hafez Ave. Tehran Iran Center of Excellence on Applied Electromagnetic Systems School of Electrical and Computer Engineering University of Tehran Iran ESAT-TELEMIC Kasteelpark Arenberg 10 bus 2444 B-3001 Leuven Belgium

ISBN: (纸本)9781612849782

The transient response of a dipole above a lossy ground is calculated with a new formulation of the Method of Moments (MoM) in time domain, based on a novel representation of the Time-Domain Mixed Potential Integral Equation (TD-MPIE), using complex-time Green's functions. The TD-MPIE is solved by MoM in time domain along with a Marching-On-in-Time (MOT) procedure. Quadratic B-spline (QB) functions are used as Temporal Basis Functions (TBFs). Numerical examples show that the solution is stable and accurate, without late-time instabilities because of the compact support of the QB TBFs. © 2011 IEEE.

关键词： Method of moments

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Design of thrust ripple minimization in wound secondary linear synchronous motors by response surface methodology (RSM)

Design of thrust ripple minimization in wound secondary line...

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Power Electronic and Drive systems and Technologies Conference (PEDSTC)

作者： Monir Sadat Hosseini Mehdi Mardaneh Khameneh Sadegh Vaez-Zadeh Advanced Motion Systems Research Lab School of Electrical and Computer Engineering College of Engineering The Center of Excellence on Applied Electromagnetic Systems University of Tehran Tehran Iran

In this paper, after modeling and analyzing a single-sided wound secondary linear synchronous motor, single- and multi-objective design optimizations of the motor are carried out to develop larger average thrust and lower thrust ripple than the prototype by using design of experiments (DOE) and response surface methodology (RSM) considering multiple responses. By defining the motor weight as another objective function, it is tried to prevent an increase in motor size and reduce its material consumption. The optimization results confirm that desirable improvements in thrust mean, thrust ripple and motor weight are achieved. Finally, a finite element analysis is employed to evaluate the effectiveness of the employed machine models used in thrust and force ripple calculations and subsequently to confirm the proposed optimization method.

关键词： Optimization Synchronous motors Analytical models Finite element methods Permanent magnet motors Electromagnets Force

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Meixner's edge condition revisited for negative permittivity materials

Meixner's edge condition revisited for negative permittivity...

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General Assembly and Scientific Symposium, URSI

作者： Amir Nader Askarpour Mehrdad Saviz Reza Faraji-Dana Electrical and Computer Engineering Department University of Tehran Tehran Iran Center of Excellence on Applied Electromagnetic Systems Electrical and Computer Engineering Department University of Tehran Tehran Iran

The work disclosed herein investigates the edge conditions for a perfect electrically conducting wedge in a medium with negative permittivity. A typical structure has been assumed in accordance with previous works for ordinary media, and an optimization technique has been used to solve the problem numerically. Special cases of importance have been explored mathematically.

关键词： Metamaterials Permittivity Equations Permeability Periodic structures Media

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Improving the Spectral Efficiency of Amplify-and-Forward Cooperative Relay Network with Adaptive M-QAM Modulation

Improving the Spectral Efficiency of Amplify-and-Forward Coo...

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International Conference on computer Communications and Networks (ICCCN)

作者： Bhuvan Modi A. Annamalai Center of Excellence for Communication Systems Technology Research Department of Electrical & Computer Engineering Prairie View A and M University TX USA

This paper investigates the performance of cooperative amplify-and-forward (CAF) relay networks with adaptive M-ary quadrature amplitude modulation (M-QAM) technique in Nakagami-m and Rice wireless fading environments. We derived closed form upper bound expression for the marginal MGF of end-to-end SNR of CAF relay system in Nakagami-m fading to compute average bit error rate (ABER), mean achievable spectral efficiency, and outage probability performance metrics. Additionally, along with the above bounding techniques, we have adopted an accurate approximate MGF of end-to-end SNR of CAF relay system to compute above mentioned performance metrics. Employing the above novel approach based on "approximate MGF" allows us to simplify the computation complexity of achievable spectral efficiency as well as ABER of CAF relay system in generalized fading environments by simply replacing appropriate single channel MGF as readily available. The accuracies of our analytical results have been validated via Monte Carlo simulations.

关键词： Relays Fading Signal to noise ratio Bit error rate Adaptive systems Wireless communication Upper bound

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Energy detector's performance evaluation in a relay based cognitive radio network: Area under the ROC curve (AUC) approach

Energy detector's performance evaluation in a relay based co...

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IEEE Globecom Workshops

作者： S. Alam O. Olabiyi O. Odejide A. Annamalai Center of Excellence for Communication Systems Technology Research Department of Electrical and Computer Engineering Prairie View A and M University TX USA

In this paper, energy detector's performance is analyzed for the two-hop relay network using the area under the receiver operating characteristic (ROC) curve (AUC) in contrast to the ROC based analysis. AUC provides summary measures for the performance of a system. It provides meaningful performance analysis as it varies only from 0.5 to 1. In the worst case scenario, the practical detector's performance can be no less than 0.5 and the best can be 1. A simple generalized AUC framework is developed based on the canonical series representations of the generalized Marcum Q-function of real order in conjunction with the k th order derivative of the moment generating function (MGF) of signal to noise ratio (SNR) of the channel. The framework is then applied to analyze the energy-detection performance for single and multiple two-hop relay networks. For multiple two-hop relay networks, the receiver combining techniques are analyzed in particular maximum ratio combining (MRC) and square-law combining (SLC) as the representative of various combining techniques. Different factors such as the sampling number, number of relays and fading severity influencing the energy sensing have been analyzed. Proposed approach is simple in terms of computation and performance analysis and the results can be used readily for selecting proper cognitive radio operating parameters. Also the solution is capable of handling the half odd-integer bandwidth-time product (u) and the half odd-integer Nakagami-m fading severity index (m).

关键词： Relays Signal to noise ratio Diversity reception Cognitive radio Receivers Rayleigh channels

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ASER Analysis of Cooperative Non-Regenerative Relay systems over Generalized Fading Channels

ASER Analysis of Cooperative Non-Regenerative Relay Systems ...

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International Conference on computer Communications and Networks (ICCCN)

作者： O. Olabiyi A. Annamalai Center of Excellence for Communication Systems Technology Research Department of Electrical and Computer Engineering Prairie View A and M University TX USA

In this article, we present a novel moment generating function (MGF) approach for performance evaluation of twohops cooperative non-regenerative multi-relay networks over a myriad of stochastic channel models. First, we develop very tight exponential approximations for the erfc(.) and erfc 2 (.) functions which will facilitate the development of a unified closed-form expression for the average symbol error rate (ASER) of a wide range of digital modulation schemes over generalized fading channels (with and without cooperative diversity). Next, we derive a new "asymptotic" approximation for the MGF of signalto noise ratio (SNR) of a two-hops relayed path in cooperative amplify-and-forward (CAF) diversity systems, which closely approximates its "exact" MGF. Combining these two techniques allows us to dramatically reduce the computational complexity for ASER of CAF multi-relay networks that have been treated in the literature for specific fading environments, besides providing accurate ASER estimates for CAF relay networks in many fading environments that heretofore had resisted a simple solution. Moreover, our final expression for the MGF of end-to-end SNR is expressed in closed-form, which is a desirable attribute for system-level performance analysis and optimization such as optimal power assignment among cooperative relay nodes, ergodic capacity analysis with adaptive transmission policies, outage probability, joint PHY/MAC layer design, and so on. The accuracies of our approximations have been validated with "exact" closed-form formulas that are available for specific wireless fading environments (e.g., Rayleigh and Nakagami-m channels) and via Monte Carlo computer simulations.

关键词： Approximation methods Signal to noise ratio Relays Rayleigh channels Binary phase shift keying

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Further results on the energy detection of unknown deterministic signals over generalized fading channel

Further results on the energy detection of unknown determini...

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IEEE Globecom Workshops

作者： O. Olabiyi S. Alam O. Odejide A. Annamalai Center of Excellence for Communication Systems Technology Research Department of Electrical and Computer Engineering Prairie View A and M University TX USA

In this article, we consider the performance of energy detection in composite multipath/shadowing fading environment. We also investigate the mitigation of the effect of these fading components on detection performance with the use of diversity techniques. Single channel, maximum ratio combining (MRC), square law combining (SLC), and square-law selection (SLS) diversities are analyzed using the rapidly convergent canonical series representation of Marcum Q-function with derivatives of moment generating function (MGF) of signal-to-noise ratio (SNR) of composite channel. On the other hand, the selection diversity combining (SDC) is analyzed using single integral of cumulative distribution function (CDF) of SNR. In all cases, we model the composite channel fading using the G-distribution which has been shown to be more accurate in representing the Suzuki and Nakagami-Lognormal distributions than K and K G and in closed formed compared to single integral expression for Rice-Lognormal distribution. Using this framework, we found out that the performance of energy detection does not degrade significantly at low and moderate shadowing conditions and that diversity detection greatly mitigates the effect of shadowing on detection performance with MRC giving the best performance, followed by SLC and then SDC or SLS depending on the average channel SNR, number of samples and level of shadowing. To the best of our knowledge, such a simple framework and resulting novel observations have never been reported before.

关键词： Shadow mapping Signal to noise ratio Fading Diversity reception Detectors Wireless sensor networks Numerical models

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