[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

This paper is concerned with the distributed filtering problem over wireless sensor networks for a class of state-saturated systems subject to fading measurements and quantization effects. Each sensor node in the network communicates with its neighbors according to the network topology described by a directed graph. The fading phenomena of measurements are assumed to occur in a random way and the attenuation coefficients of the fading measurements are described by a set of random variables with known stochastic properties. By solving two sets of matrix difference equations, an upper bound for the filtering error covariance is presented. Subsequently, with the topology information of the sensor network, such an upper bound is minimized by properly designing the filter parameters. Moreover, the performance of the proposed filter is investigated through establishing sufficient conditions ensuring that the trace of the upper bound is bounded. The relationship between the filter performance and the mean of attenuation coefficient is also discussed. A numerical simulation is exploited to demonstrate the effectiveness of the proposed filtering method.

Recursive Distributed Filtering for a Class of State-Saturated Systems With Fading Measurements and Quantization Effects

Two-dimensional (2-D) digital filters can be corrupted by external interferences, but no stability criteria have yet been established This brief proposes a new l2 - l∞ stability criterion for the absence of limit cycles in 2-D digital filters that are described by Roesser model with external interference Our new criterion ensures the attenuation of the effect of external interference on 2-D digital filters to a prescribed level This criterion also guarantees the asymptotic stability result without external interference The proposed criterion is represented in terms of linear matrix inequality, which can be verified by using existing numerical packages We use an illustrative example to demonstrate the effectiveness of the proposed criterion

$l_{2} - l_{\infty}$ Elimination of Overflow Oscillations in 2-D Digital Filters Described by Roesser Model With External Interference

This paper considers the H∞ control for a class of interval time-varying delay systems. Based on Lyapunov stability theory and linear matrix inequality (LMI) technique, a delay-dependent stability condition with less conservatism and H∞ performance criterion is proposed by using the idea of delay partition and convex optimization approach. Furthermore, state feedback H∞ controller design is presented. Finally, a numerical example is provided to demonstrate the effectiveness and feasibility of the proposed results.

https://ieeexplore.ieee.org/iel7/6621666/6639389/06639896.pdf

H ∞ control for linear systems with interval time-varying delay

In this research, the design of a new genetic algorithm (GA) is introduced to detect the locations of license plate (LP) symbols. An adaptive threshold method is applied to overcome the dynamic changes of illumination conditions when converting the image into binary. Connected component analysis technique (CCAT) is used to detect candidate objects inside the unknown image. A scale-invariant geometric relationship matrix is introduced to model the layout of symbols in any LP that simplifies system adaptability when applied in different countries. Moreover, two new crossover operators, based on sorting, are introduced, which greatly improve the convergence speed of the system. Most of the CCAT problems, such as touching or broken bodies, are minimized by modifying the GA to perform partial match until reaching an acceptable fitness value. The system is implemented using MATLAB and various image samples are experimented with to verify the distinction of the proposed system. Encouraging results with 98.4% overall accuracy are reported for two different datasets having variability in orientation, scaling, plate location, illumination, and complex background. Examples of distorted plate images are successfully detected due to the independency on the shape, color, or location of the plate.

Localization of License Plate Number Using Dynamic Image Processing Techniques and Genetic Algorithms

Robust stability of discrete-time state-delayed systems with saturation nonlinearities: Linear matrix inequality approach

This paper considers the problem of global asymptotic stability of a class of nonlinear uncertain discrete-time state-delayed systems. The class of systems under investigation involves multiple state delays, norm-bounded parameter uncertainties, and generalized overflow nonlinearities which cover usual types of overflow arithmetic used in practice. A new criterion for the global asymptotic stability of such systems is presented. A numerical example is given to illustrate the applicability of the criterion presented.

Robust stability of discrete-time state-delayed systems employing generalized overflow nonlinearities

A recently reported criterion for the exponential stability and H ∞ performance of fixed-point digital filters with saturation arithmetic and external disturbance is reviewed. It is shown that there is a technical error in this criterion. A corrected version of the criterion is presented. Finally, a relaxed version of the criterion is made available.

A note on the criterion for the elimination of overflow oscillations in fixed-point digital filters with saturation arithmetic and external disturbance

An LMI condition for robust stability of discrete-time state-delayed systems using quantization/overflow nonlinearities

A delay-dependent criterion for the global asymptotic stability of a class of uncertain discrete-time state-delayed systems using various combinations of quantization and overflow nonlinearities is presented. The proposed criterion is in the form of a linear matrix inequality and, hence, computationally tractable. A numerical example highlighting the usefulness of the proposed criterion is given. Copyright © 2010 John Wiley & Sons, Ltd.

Delay-dependent LMI condition for global asymptotic stability of discrete-time uncertain state-delayed systems using quantization/overflow nonlinearities

V. Krishna Rao Kandanvli

Papers

Robust stability of discrete-time state-delayed systems with saturation nonlinearities: Linear matrix inequality approach

Robust stability of discrete-time state-delayed systems employing generalized overflow nonlinearities

A note on the criterion for the elimination of overflow oscillations in fixed-point digital filters with saturation arithmetic and external disturbance

An LMI condition for robust stability of discrete-time state-delayed systems using quantization/overflow nonlinearities

Delay-dependent LMI condition for global asymptotic stability of discrete-time uncertain state-delayed systems using quantization/overflow nonlinearities