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This paper addresses robust control and scheduling codesign for networked embedded control systems (NECS) with uncertain but interval-bounded time-varying computation and communication delays. The NECS is modeled as a discrete-time switched linear system with polytopic uncertainty. A robust receding-horizon control and scheduling problem with a quadratic performance criterion is introduced and solved...
This paper proposes a discontinuous-impulsive output feedback which is a sampled based second order sliding mode controller. First, constructive convergence conditions are established for the controller, in the unperturbed and perturbed case. An adaptation mechanism is based on the aforementioned convergence conditions and allows to reduce gain magnitude.
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...
In this paper we derive sufficient conditions for passivity of neutral type time delay systems (TDS) with time varying parametric uncertainties. The delays in states and state derivatives are assumed to be time varying. Delay dependent sufficient conditions for robust passivity, are derived in terms of Linear Matrix Inequalities (LMIs). Feedback control law is formulated for robust passification of...
This paper proposes a cross-layer control mechanism to stream efficiently scalable videos to mobile receivers. Its goal is to maximize the quality of the received video while accounting for the variations of the characteristics of the transmitted content and of the channel. The control problem is cast in the framework of Markov Decision Processes. The optimal actions to apply to the system are learned...
We propose an SRAM replica tracking circuit that reduces divergence of the replica path relative to normal read path (6–16% less Sense differential Requirement), thus improving the access time by 5–8%. The approach is compatible to power managed SRAMs having Retain till Access feature and also for non power managed SRAMs with no sense differential impact. Using This Replica tracing circuit Sense differential...
Advances in the chip manufacturing process impose new requirements for post-production test. Small Delay Defects (SDDs) have become a serious problem during chip testing. Timing-aware ATPG is typically used to generate tests for this kind of defects. Here, the faults are detected through the longest path. In this paper, a novel timing-aware ATPG approach is proposed which is based on Pseudo-Boolean...
One approach for achieving integrated-system robustness centers on performing test during runtime, identifying the location of any faults (or potential faults), and repairing or avoiding the affected portion of the system. Fault dictionaries can be used to locate faults but conventional approaches require significant memory storage and are therefore limited to simplistic fault types. To overcome these...
An iterative flow to generate test sets providing high fault coverage under extreme parameter variations is presented. The generation is guided by the novel metric of circuit coverage, calculated by massively parallel statistical fault simulation on GPGPUs. Experiments show that the statistical fault coverage of the generated test sets exceeds by far that achieved by standard approaches.
Self-Adaptive VDD Scaling (SAVS) technique achieves power/energy reduction by dynamically scaling VDD for the prevailing conditions. However, when applied in sub-threshold (sub-Vt) region, robustness issues need to be addressed due to the severe delay uncertainty associated with sub-Vt Process, Voltage, and Temperature (PVT) variations. To ensure robustness for sub-Vt SAVS, we adopt the asynchronous-logic...
In this paper, some sufficient conditions for global robust asymptotical stability of neural networks with time-varying delays are presented. On basis of the obtained results, some linear matrix inequality (LMI) criteria are derived. A comparison of the present criteria with the previous criteria is made. Moreover, an example is given to show the effectiveness of the obtained results.
This paper deals with the problem of delay-dependent robust stochastic stabilization and robust Η∞ control for uncertain markovian jump systems with multiple delays in both state and input. Based on the conditional expectation of the Markov chain's mode-set, an improved method of the delay-dependent robust stochastic stabilization for this markovian jump systems is obtained by introducing a mode-independent...
Global robust exponential stability problems for Cohen-Grossberg neural networks are investigated in this paper. New sufficient conditions are derived to ensure the global robust exponential stability of the equilibrium point by using a new inequality and linear matrix inequality technique. A numerical example is given to show the effectiveness of the theoretical results.
Design and planning Military networks requires complex cost-performance trades involving several functions ranging from subnet creation, topology generation, routing hierarchy design & protocol choice, waveform and frequency planning and MAC choices. In this paper we focus on a subset of the design problems pertaining to routing architecture design with unit task organization (UTO) requirements...
Real-life systems should perform within tight limits even when affected by uncontrollable factors such as temperature and power supply variations. This paper outlines a methodology for robustness optimization based on the Design of Experiments and metamodelling concepts. The main idea is to derive metamodels of the mean response and its dispersion depending only on control factors; thus, the optimization...
With the scaling of the CMOS technology, domino logic circuits experience larger leakage currents, which affect their robustness and performance. The leakage can be compensated by using a properly sized PMOS keeper transistor, at the cost of circuit delay increase. Hence, it is expected that the performance improvement of domino logic will stop in future technology nodes, due to increased required...
This paper is concerned with the robust fault tolerant controller design of networked control systems with time-varying sampling periods. Based on Lyapunov stability theory and using LMI approach, new criteria are proposed for the controller design. A numerical example is given to demonstrate the proposed method.
A novel robust tracking control technique for time-delay systems with uncertain time-delays based on fuzzy T-S is presented. Fuzzy T-S model with parametric uncertainties is employed to represent the uncertain time-delay plant. This control synthesis design is shown reduce the tracking error considerably for all bounded reference inputs while guaranteeing the H∞ performance. The proposed solution...
An output feedback model reference adaptive controller is developed for a class of linear systems with multiple unknown time-varying state delays and in the presence of actuator failures. The adaptive controller is designed based on SPR-Lyapunov approach and is robust with respect to multiple unknown time-varying plant delays and to an external disturbance with unknown bounds. Closed-loop system stability...
Congestion is a problem in real networks. Users do not want to lose information and data should be delivered as fast and reliably as possible. This is really difficult to achieve. Moreover, networks work in changing environments: number of users, type of traffic, delays in transmission, etc. So this paper presents how to design PID controllers that take network changes into account. Non-linear simulations...
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