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Browsing EECS Faculty Publications by Title

Browsing EECS Faculty Publications by Title

Now showing items 48-67 of 70

On the robustness of observer-based controllers

Beheshti, M. T.; Sawan, M. E. (IEEE, 1987-06-10)

In this paper, we investigate the robustness of the observer-based controller under Parameter perturbations. Our goal is to find the conditions for insensitivity of the optimal observer-based controller to parameter ...
Optimal control for a class of interconnected discrete-time systems with parameter uncertainty

Challoo, R.; Sawan, M. Edwin (IEEE, 2009-03-10)

A large-scale interconnected discrete-time system is considered. This system consists of three interconnected discrete-time subsystems x1, X2, and X3 where x2 and X3 can be directly controlled with the controls u2 and ...
Optimal control systems with low sensitivity to small time delays

Sawan, M. Edwin; Cruz, J. B. (IEEE, 1979-12-01)

The problem of reducing trajectory sensitivity to small time delays is considered. State and output feedback gains are computed, so that the system performs optimally with low sensitivity. The delay is assumed to be expected ...
An optimal frequency domain filter for edge detection in digital pictures

Shanmugam, K. Sam; Dickey, Fred M.; Green, James A. (IEEE, 1979-01-01)

Edge detection and enhancement are widely used in image processing applications. In this paper we consider the problem of optimizing spatial frequency domain filters for detecting edges in digital pictures. The filter is ...
Optimal pole shifting for discrete time systems

Arar, A. S.; Sawan, M. Edwin (IEEE, 1992-06-24)

A recursive method for selecting the state weighting matrix of a linear quadratic regulator problem in order to shift the open loop eigenvalues to be at desired location is presented. This method is capable of shifting a ...
Optimum clustered pilot sequence for OFDM systems under rapidly time-varying channel

Kim, Kwanghoon; Park, Hyuncheol; Kwon, Hyuck M. (IEEE, 2012-05)

As channel time-variation increases, orthogonality among subcarriers in an orthogonal frequency division multiplexing (OFDM) symbol can be destroyed because of the relatively long symbol period, whereupon intercarrier ...
Output feedback design of singularly perturbed discrete-time systems

Oloomi, Hossein; Alyatim, Amjad; Sawan, M. Edwin (IEEE, 1986-06-18)

The output feedback regulator design for linear shift-invariant discrete-time systems possessing the two-time-scale property is considered. An approximating quadratic performance index is derived, reflecting a two-time-scale ...
Phase synchronization for distributed sensor networks in feedback bit errors

Wu, Haijie; Ding, Yanwu; Kwon, Hyuck M. (IEEE, 2010-06-25)

It has been reported recently that phase synchronization in distributed sensor networks can be achieved by adjusting the phase in sensors randomly with a single bit feedback from the receiver (base station) to the sensors. ...
Pole placement using projective controls and LQ modification

Arar, A. S.; Sawan, M. Edwin (IEEE, 1991-06-26)

A method for solving the output regulator problem by using projective controls was reported by Medanic. Using this method reigenvalues of the state feedback closed-loop system can be retained where r is the number of the ...
Pulsed ferrite magnetic field generator for through-the-earth communication systems for disaster situation in mines

Bae, Seok; Hong, Yang-Ki; Lee, Jaejin; Park, Jihoon; Jalli, Jeevan; Abo, Gavin S.; Kwon, Hyuck M.; Jayasooriya, Chandana K. K. (Korean Magnetics Society, 2013-03)

A pulsed ferrite magnetic field generator (FMFG) was designed for the use in the 1000 m long through-theearth (TTE) communication system for mining disaster situations. To miniaturize the TTE system, a ferrite core having ...
Reinforcement and backpropagation training for an optical neural network using self-lensing effects

Cruz-Cabrera, A.A.; Yang, Mingtao; Cui, Guogi; Behrman, Elizabeth C.; Steck, James E.; Skinner, Steven R. (IEEE, 2000-11)

The optical bench training of an optical feedforward neural network, developed by the authors, is presented. The network uses an optical nonlinear material for neuron processing and a trainable applied optical pattern as ...
Rewriting XPath queries using materialized XPath views

Ramanan, Prakash (Elsevier, 2012-07)

Let XP(/, //, []) be the fragment of XPath 1.0, consisting of queries that involve only the child and descendant axes, and predicates without disjunction or negation (and no wildcard nodetests); these queries can be ...
Robustness of sampled-data control to unmodeled high-frequency dynamics

Dinh, Joseph H.; Sawan, M. Edwin (IEEE, 1993-06-02)

Robustness of sampled-data control designs to unmodeled high-frequency dynamics is studied using singular perturbation theory. When a plant is preceded by a zero-order holder, a direct transmission term of the reduced-order ...
A robust observer-based model-following control

Moursi, Z. M.; Raptis, J.; Sawan, M. Edwin (IEEE, 1988-06-15)

The model-following problem has been expressed as an LQ-problem, and robustness achieved by including an exponential factor in the cost integrand. In this paper the observer-based case is considered and the inherent ...
Robust performance design of PID controllers with inverse multiplicative uncertainty

Emami, Tooran; Watkins, John Michael (IEEE, 2011-06-29)

In this paper a graphical method is introduced for finding all proportional integral derivative (PID) controllers that satisfy a robust performance constraint for a given single input-single-output (SISO) linear time ...
Simulations on the statistical properties for cascaded Rayleigh fading channel

Ibdah, Yazan; Ding, Yanwu; Kwon, Hyuck M.; Lee, Kanghee (IEEE, 2011-11-07)

In the past few years, mobile to mobile communication has gained much attention. Researchers have invested considerable effort in obtaining appropriate channel models to understand the statistical properties of the underlying ...
Study of mobile mixed sensing networks in an automotive context

Chakravarthy, Animesh; Song, Kyungyeol; Peraire, Jaime; Feron, Eric (Springer, 2012)

Mixed sensing mobile networks comprise of mobile sensors that have different sensing capabilities. We look at such sensor networks in an automotive context; wherein automobiles with two levels of sensing (and consequently ...
Suboptimal model matching problem for two frequency scale transfer functions

Oloomi, Hossein; Sawan, M. Edwin (IEEE, 1989-06-21)

HÂ¿ model matching problem (MMP) for single-input/single-output (SISO) two frequency scale (TFS) systems is considered.
Target tracking strategies for a nonlinear, flexible aircraft-inspired model

Chakravarthy, Animesh; Evans, Katie A.; Evers, Johnny; Kuhn, Lisa M. (IEEE, 2011-06-29)

Aeroelastic wing micro aerial vehicle (MAV) concepts are being explored for military and civilian applications. However, on the whole, the issues of control of MAVs are largely unexplored. The authors seek to employ ...
Time-varying dynamics of a micro air vehicle with variable-sweep morphing

Chakravarthy, Animesh; Grant, Daniel T.; Lind, Rick (The American Institute of Aeronautics and Astronautics, 2012-05)

In this paper, the longitudinal dynamics of a fast-morphing, variable-wing-sweep micro air vehicle are investigated from a flight dynamics perspective. The time scales over which the morphing occurs are of the same order ...