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The implementation of Model Predictive Control (MPC) requires to solve an optimization problem online. The computation time, often not negligible especially for Nonlinear MPC (NMPC), introduces a delay in the feedback loop. Moreover, it impedes fast sampling rate setting for the controller to react to uncertainties quickly. In this paper, a dual time scale control scheme is proposed for linear/nonlinear...
In order to maintain a small, stable backlog at the router buffer, active queue management (AQM) algorithms drop packets probabilistically at the onset of congestion, leading to backoffs by Transmission Control Protocol (TCP) flows. However, wireless losses may be misinterpreted as congestive losses and induce spurious backoffs. In this paper, we raise the basic question: Can AQM maintain a stable,...
Data centers are nowadays ubiquitous, in a worldwide scale, and often geographically dispersed. In such environments, data reliability and availability are enhanced via data redundancy throughout the distributed storage. Because user performance is important in data centers, data updates in such distributed environments are done such that eventual consistency is achieved. In this paper we utilize...
We propose in this paper, a robustness testing method of composite Web services. Our method aims to automatically test operations robustness which are provided by the involved Web services in the composition. Symbolic specification, used as a composition model is first translated into a symbolic execution tree that characterizes the execution paths followed during the symbolic execution. Then, from...
The optimal allocation of Communication-Intensive Applications is a well-know complex issue in Clouds. This kind of applications, due to the strong impact of communications on their performance, requires not only that their tasks are allocated on resources able to satisfy their computational requirements but also that the distance among these resources, in terms of communication delay or latency,...
This paper, the robust stability problem of dynamic interval systems with multiple time-delays is considered. Firstly, a kind of equivalent description of the interval matrix is presented. Then by using Lyapunov stability theory and matrix measure approach, several simple sufficient conditions of robust stability for dynamic continuous and discrete interval systems with multiple time-delays are obtained,...
Control of time delay system has been researched for a long time. In time delay system, feedback including time delay sometimes makes transient response of a system worse. In the worst case, the system becomes unstable. As time delay compensation method, various methods have been proposed, for example, smith predictor, communication disturbance observer, and so on. In particular, communication disturbance...
The problem of designing robust H∞ filters for Markovian jump systems with time-varying delays and parametric uncertainties is studied. Some delay-dependent conditions for the existence of the desired H∞ filter are obtained via a new mode-dependent Lyapunov functional such that the corresponding filtering error system is robustly stochastically stable with a prescribed H∞ performance level. The attractive...
Subthreshold logics and memories are crucial elements in ubiquitous-computing applications. The subthreshold circuits need level converters to communicate with the other circuits that use high supply voltages. However, level conversion from sub-to-super-threshold voltage suffers from weak driving strength and severe process variations. The level conversion may depend on the size or threshold voltage...
This paper investigates the problem of robust stabilization for uncertain networked control systems (NCSs) with random time delay via the output feedback control. A mode dependent controller is proposed by modeling the random delay as a Markov Chain. The resulting closed-loop system is expressed as a Markovian jump linear system (MJLS) with mode-dependent delay. Based on Lyapunov-Krasovskii method,...
Moving into the era of nanoscale devices, reliable clock distribution becomes a challenging problem due to the growing impact of process variations. This paper deals with this difficulty, especially on implementing useful clock skew. One possible robust way is by using programmable delay elements (PDEs) since PDEs can be adjusted after fabrication. However, with this benefit, using PDEs takes large...
The modified repetitive control system is a type of servomechanism for a periodic reference input. When modified repetitive control design methods are applied to real systems, the influence of uncertainties in the plant must be considered. In some cases, uncertainties in the plant make the modified repetitive control system unstable, even though the controller was designed to stabilize the nominal...
With CMOS technology shrinking to nanoscale regime, the susceptibility of a single chip to soft errors increases. Hence, the critical charge (Qcrit) of circuit decreases and this decrease is expected to continue with further technology scaling. In this paper previous hardened latch circuits are analyzed and it is found that previous designs offer limited protection against soft error especially for...
This paper considers the adaptive control problem for a class of large-scale systems with time-varying delays in interconnections. The nonlinear uncertainties of the systems under study are bounded by polynomial functions with unknown gains. On the basis of constructing a set of Lyapunov - Krasovskii functionals, new sufficient conditions for the existence of the corresponding adaptive control and...
Wireless Sensor Networks (WSNs) form a critical component in modern computing applications; given their size, ability to process and communicate information, and to sense stimuli, they are a promising part of The Internet of Things. However, they are also plagued by reliability and node failure problems. Here we address these problems by using E. coli Gene Regulatory Networks (GRNs) — believed to...
This paper details one of the front-end components of the system used at the PASCAL-CHiME multi-source robust automatic speech recognition (ASR) challenge 2011. The presented approach uses uncertainty propagation techniques to integrate conventional beamforming with automatic speech recognition. The paper addresses the derivation of a complex Gaussian posterior for the multi-channel Wiener and the...
A well used approach for echo cancellation is the two-path method, where two adaptive filters in parallel are utilized. Typically, one filter is continuously updated, and when this filter is considered better adjusted to the echo-path than the other filter, the coefficients of the better adjusted filter is transferred to the other filter. When this transfer should occur is controlled by the transfer...
In this paper, a new multichannel approach to robust loudspeaker-room equalization is presented. Traditionally, the equalization (or room correction) problem has been treated mostly by single-channel methods, with loudspeaker signals being prefiltered individually by separate scalar filters. Single-channel methods can generally improve the average spectral flatness of the acoustic transfer functions...
In this work we focus on a stochastic optimization based approach to make distributed routing and server management decisions in the context of large-scale, geographically distributed data centers, which offers significant potential for exploring power cost reductions. Our approach considers such decisions at different time scales and offers provable power cost and delay characteristics. The utility...
Owing to the advantages of the “system of systems” that has been widely used in enormous fields ranging from science to engineering, in this paper the method of the “system of systems” is applied to the analysis of the network architecture of the Internet and the corresponding controller of the Internet flow where the robustness is one of the most crucial factors for the performance analysis of the...
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