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The problems of Hinfin stability and stabilization for networked control systems (NCSs) with state and control signal quantizations are considered, and a new sector bound approach is proposed. Unlike the previous works, the transform of system models to uncertain systems is not needed, which results in that the proposed controller design method is simpler. Even for the NCSs with only state quantizations,...
This paper presents an application of statistical mechanics for analysis of critical phenomena in complex networks. Using the simulation model of a wired communication grid, the nature of phase transition is characterized and the corresponding critical exponent is computed. Network analogs of thermodynamic quantities such as order parameter, temperature, pressure, and composition are defined and the...
In this paper we consider the problem of driving to zero by means of state feedback the state of a nonlinear plant when only an approximate model of the plant is known and the information about its state is sampled. To this aim, we develop a specific model based control scheme and, under suitable hypotheses, we give a sufficient condition, in terms of length of the sampling interval and of other design...
This paper reports on our work of integrating low-cost sensors, probabilistic localization, and stochastic learning in a wireless sensor network-based system applied to warehouse management. This work is on-going, and our next step will be running the actor-critic policy optimization on a realistic scale in the real warehouse environment.
This paper addresses the static output feedback (SOF) Hinfin control for continuous-time linear systems with an unknown input delay from a novel perspective. New equivalent characterizations on the stability and Hinfin performance of the closed-loop system are established in terms of nonlinear matrix inequalities with free parametrization matrices. These delay-dependent characterizations possess a...
In this study, a procedure was developed to help transportation professionals evaluate the impacts of U-turns on level of service of signalized intersections using two widely used simulation packages: Synchro and SimTraffic. Two parameters related to U-turns were calibrated based on field data. They are (1) the saturation flow rate for U-turn and left-turn mixed traffic stream; and (2) the turning...
This paper addresses the adaptive stabilization problem of linear networked control systems with network-induced delay in the presence of state-dependent disturbances. The case of state feedback is treated in which a new adaptive model of networked control system in the presence of network-induced delays and state-dependent disturbances is proposed. Based on Lyapunov stability theory, new delay-dependent...
Active security and intelligent transportation are important Vehicular Ad hoc Network (VANET) applications, which need suitable vehicle-to-vehicle communication technology, especially routing technology. When designing routing protocol for VANET, driving information of vehicles can be used as routing metrics, which can provide additional routing information. A routing metric combining hop and speed...
This paper presents further results on the problem of establishing stability of retarded nonlinear interconnected systems comprising integral input-to-state stable subsystems. It is shown that the stability of the interconnected systems with respect to external signals can be verified by constructing Lyapunov-Krasovskii functionals explicitly whenever small-gain type conditions are satisfied. The...
This paper establishes the equivalence among several stability criteria, and presents a simplified stability criterion for singular time-delay systems. Furthermore, by using a delay decomposition method, a new stability criterion which is much less conservative than the existing ones is obtained. A numerical example is given to illustrate the effectiveness and less conservatism of the new proposed...
The problem of absolute stability for Lur'e singular systems with time-varying delay is presented. Two cases of time-varying delays - one being continuous-uniformly bounded and the other being differentiable-uniformly bounded with the derivative of the delay bounded by a constant are considered. Based on a new integral inequality, which avoids employing both model transformation and bounding technique...
The calculus of deterministic constraints on service and traffic streams offers a rich language to specify service guarantees. In particular, the service curve earliest deadline first (SCED) algorithm has an associated feasibility test given by linear constraints. Users sending streams of data through the server may have differing needs for delay and throughput.We suggest a way based on utility function...
In a recent paper we presented the first adaptive control design for an ODE system with a possibly large actuator delay of unknown length. We achieved global stability under full state feedback. In this paper we generalize the design to the situation where, besides the unknown delay value, the ODE also has unknown parameters, and where trajectory tracking (rather than equilibrium regulation) is pursued.
A simple nonlinear observer with a dynamic gain is proposed for a class of bounded-state nonlinear systems subject to state delay. By saturating the states of the system nonlinearities, we show that the observer exists whatever the delay is. Furthermore, it will be highlighted that the observer design is free from any preliminary analysis of the time-delay system such as estimating the Lipschitz constants...
Spatial filtering is an interest management mechanism that eliminates unnecessary state updates transmitted in distributed virtual environments. This paper proposes a new protocol to reduce the communication overhead for supporting spatial filtering. The protocol maintains potential interest regions (PIRs) to assist in observing entities entering the areas-of-interest (AOIs) of other entities. PIRs...
In this paper an optimal Kalman filter design problem is studied for networked stochastic linear discrete-time systems with random measurement delays, packet dropouts and missing measurements. Any of these three uncertainties in the measurement can occur in the network in the same run. Based on a Markov chain, we develop a unified/combined model to accommodate random delay, packet dropouts and missing...
Stabilization of unstable systems with actuator delay of substantial length and of completely unknown value is an important problem that has never been attempted. We present a Lyapunov-based adaptive control design that achieves global stability, without a requirement that the delay estimate be near the true delay value. We solve the problem by employing a framework where the actuator delay is represented...
A data-driven procedure is used to find linguistic rules that describe a dynamic process. In order to select valid rules, the concept of trip is proposed to reveal a rule status in a Truth Space Diagram (TSD). Based upon the trip, a normalized metric is proposed to assess a rule, which then makes the comparison possible among rules with the same antecedent but conflicting consequents. In addition,...
Distributed camera systems are typically used to simultaneously track multiple targets. Communication between cameras enables the ability to monitor targets in a complex environment where occlusion happens. Asynchronicity and time delay are among the most important factors that affect tracking error. We provide a feedback law controlling the pan and tilt of each camera to track the centroid of a cluster...
In this paper, a decentralized overlapping static output feedback law is proposed to control a linear time-invariant (LTI) interconnected system. It is assumed that an overlapping information flow structure is given which determines which output measurements are available for any local control agent. Uncertain transmission delay is also considered in communication links among different subsystems...
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