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This paper presents new robust linear matrix inequality conditions for full order robust ℋ℞ filter design of discrete-time polytopic linear systems affected by a time-varying delay. Thanks to the use of a larger number of slack variables, the proposed conditions are less conservative than the existing methods. Numerical experiments illustrate the better performance of the proposed filter design procedure...
Subthreshold circuits have received widespread attention towards fulfilling ultralow power requirement of battery operated portable devices. Si-MOSFET shows huge performance degradation in terms of speed and robustness against variations when operated in subthreshold region. Improving the same will further expand their application area. DG FinFETs are most promising even in subthreshold region which...
Fine-grain Dynamic Voltage and Frequency Scaling (DVFS) is becoming a requirement for Globally-Asynchronous Locally-Synchronous (GALS) architectures. However, the area overhead of adding voltage and frequency control engines in each voltage/ frequency island must be taken into account to optimize the circuit. This paper focuses on the control for the frequency actuator. An optimal and robust saturated...
This paper proposes a closed-loop propofol admission strategy for depth of hypnosis control in anesthesia. A population-based, robustly tuned controller brings the patient to a desired level of hypnosis. The novelty lies in individualizing the controller once a stable level of hypnosis is reached. This is based on the identified patient parameters and enhances suppression of output disturbances, representing...
The problem of robust and non-fragile control by static state feedback gains assuring both the ℋ∞ guaranteed cost and regional pole location of the closed loop eigenvalues is proposed in this paper, for uncertain discrete-time system with multiple delays in the states. The regional pole location, or the D-stabilization, concerns with the problem of locating the closed-loop system eigenvalues inside...
We propose a new solution to the problem of globally asymptotically stabilizing a nonlinear system in feedback form with a known pointwise delay in the input. The result covers a family of systems wider than those studied in the literature and endows with control laws with a single delay, in contrast to the existing one, which include two distinct pointwise delays or distributed delays. The design...
A weakened implementation scheme for real-time feedback controllers is proposed to reduce the conservatism due to traditional worst-cases considerations, while preserving the stability and control performance. Based on recent results to assess stability of linear systems with delayed and sampled-data inputs, this paper takes into account both the effects of deadline misses of control tasks and uncertainties...
This paper is concerned with the problem of H∞ filter design for linear continuous-time state-delayed systems with finite frequency specifications. The developed approaches in the paper are to design a filter guaranteeing an H∞ performance bound in a finite frequency range for delayed systems. To reduce conservatism, delay-partitioning idea is exploited to derive a new finite frequency bounded real...
In this paper a new Active Queue Management (AQM) strategy based on Nonlinear Generalized Minimum Variance (NGMV) control is proposed for TCP/AQM networks. The NGMV control is a model free method which only requires output of the system. Cost function of this method involves weighted output error and weighted control signal terms. The NGMV controller is implemented in order to minimize the cost function...
The problem of robust stability for a class of uncertain neutral systems with distributed delays is inrestigated. Firstly, by constructing a functional. Then, a adaptive sliding mode controller (ADSMC) is proposed based on lyapunov functional, make the system asymptotic stability to the sliding plane obtain the desired dynamic erformance. Finally, a mumerical example is given to illustrate the e ectiveness...
In this paper, an adaptive neural control for a class of time-delay nonlinear systems with perturbed is posed, Based on radius basis function(RBF)neural networks, The radius basis function (RBF) neural networks is employed to estimate the unknown continuous functions. It is shown that the proposed method guarantees the semi-globally uniformly ultimately bounded ness of all signals in the adaptive...
This paper investigates the beamforming design for multiuser downlink with limited feedback, where a practical channel state information (CSI) feedback model consisting both feedback delay and CSI quantization error is considered. Under this circumstance, we derive a closed-form multiuser beamforming scheme via minimizing the expected mean square error (MSE) with respect to the feedback imperfection...
The problem of adaptive robust stabilization is considered for a class of uncertain nonlinear time-delay dynamical systems. It is assumed that the upper bound of the nonlinear delayed state perturbations is a linear function of some parameters which are assumed to be unknown. It is also assumed that the time delays are time-varying, and can be any nonnegative continuous and bounded functions. In this...
In this paper we present an autonomous watchdog circuit for error robustness which can detect logic errors caused by power supply noises and soft errors, with the smallest overheads compared to current research. The proposed watchdog circuit is realized with the dual-pipeline self synchronous system, without the need to duplicate logic. The watchdog circuit prevents error propagation through the logic...
Parallel cascade control structure is commonly used in the operation of process industries to reject disturbances that have a rapid effect on a secondary measured state, before the primary measured variable is affected. The investigations on PID tuning rules for SISO systems are many; however the literature about synthesis methods for designing and tuning cascade control structures appears to be rather...
Service compositions are increasingly used for the fast development of loosely-coupled dynamic distributed applications. Such compositions are prone to potential failures arising from their complex interaction scheme and from various kinds of network problems. Functional testing could overlook such failures, hence we claim it is important to specifically consider test cases for validating how the...
The robust servomechanism problem, which is to design a stabilizing controller such that the system output robustly tracks a given reference signal in the presence of certain disturbances, is considered for linear time-invariant time-delay systems of retarded type with distributed time-delay. The reference and the disturbance are assumed to satisfy a linear time-invariant delay-differential equation...
In this paper robust constrained regulation problem for a discrete-time system with actuation delay has been considered. Persistent but bounded measurement noise and disturbance input are present. Furthermore, a polytopic bound on estimation error is assumed to be given. A linear estimator is designed such that the given polytopic estimation error bound is achievable. Actuating delay is compensated...
Dynamic logic style is used in high performance circuit design because of its fast speed and less transistors requirement as compared to CMOS logic style. But it is not widely accepted for all types of circuit implementations due to its less noise tolerance and charge sharing problems. A small noise at the input of the dynamic logic can change the desired output. Domino logic uses one static CMOS...
This paper investigates the problem of stabilization of linear systems with unknown delay. The delay term in the system is represented by an interpolation of state values with constant delays by fuzzy approximation technique, resulting in a fuzzy model describing a large amount of complex systems focused on the unknown delay, where the delay can be constant and time-varying with or without known delay...
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