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The synchronization of multi-weighted complex dynamical networks with fixed and switching topologies is respectively investigated in this paper. Firstly, by putting to use Lyapunov functional approach and some inequality techniques, we establish a synchronization criterion for the multi-weighted complex dynamical network with fixed topology. In addition, the similar methods can be applied to get some...
This paper is concerned with finite-time synchronization for two models of coupled Cohen-Grossberg neural networks with time-varying delays. In the first one, linearly coupled Cohen-Grossberg neural networks is considered. In the second one, nonlinearly coupled Cohen-Grossberg neural networks is discussed. Based on finite-time stability theory, some inequality techniques, and designed controllers,...
In this paper, the problem of finite-time stabilization for a class of memristor-based neural networks with time-varying delays is investigated by using hybrid impulsive and nonlinear feedback controllers. Based on the theory of the differential equations with discontinuous right and Lyapunov function approach, several sufficient conditions are derived to guarantee the finite-time stabilization of...
This paper investigates synchronization problem of two identical chaotic Lur'e systems with time delay using sampleddata control. Firstly, a novel piecewise Lyapunov-Krasovskii function (LKF), which considers fully useful information of the systems and their cross terms, is introduced. Secondly, a new synchronization criterion is developed in terms of linear matrix inequalities (LMIs) by discarding...
This paper is focused on the asymptotical synchronization of memristor-based neural networks with time-varying delays via adaptive controllers. In existing investigations, most results about synchronization of MNNs can only be applied to some specific MNNs. Thus, we introduce a new simple adaptive controller to synchronize two MNNs with time-varying delays asymptotically. Furthermore, some new conditions...
In this paper, we investigate the finite-time cluster synchronization problem for networks with nonlinearly coupled delayed networks of nonidentical delayed dynamic systems. We derive sufficient conditions for finite-time cluster synchronization through a proper controller based on finite-time stability theory. Some numerical examples are then given to illustrate the theoretical results.
In this paper, we propose a cooperative control law of human-robotic networks in the presence of inter-robot communication delays. The objective is to guarantee human enabled synchronization of positions of robotic network to desired reference. We first design a cooperative controller to be implemented on each robot so that their motion are synchronized to a reference motion desired by a human operator...
In a high movement environment, handover occurs frequently in a mobile network and degrades the quality of mobile communication and service. The shorter the handover delay is, the better the communication quality can be obtained. To shorten the handover delay for a bunch of UEs moving in the same direction, mobile relays (MR), an intermediate role between a UE and an eNodeB (eNB), have been introduced...
Rehabilitation robotic systems may afford better care and telerehabilitation may extend the use and benefits of robotic therapy to the home. Data transmissions over distance are bound by intrinsic communication delays which can be significant enough to deem the activity unfeasible. Here we describe an approach that combines unilateral robotic telerehabilitation and serious games. This approach has...
This paper addresses the master-slave synchronization problem of continuous time nonlinear switched systems. The idea is to use sampled-data of both the measurement output and switching signal to design feedback control laws with synchronizing controller gains. Firstly, based on input delay approach, the synchronization error system is modeled as a switched system with state delay and asynchronous...
There are main parameters of synchronization signals stability and methods for their monitoring in packet networks in the article. The principles of monitoring synchronization signals in the LTE network are presented.
A new implementation of the recently proposed fixed-frequency two-sample (2S) quadrature generation subsystem (QSG) digital Phase Locked Loop PLL, applicable to single-phase Power Factor Correction (PFC), is proposed. Its characteristics are high accuracy and low computational burden. The proposed PLL includes a frequency feedback loop to improve the synchronization under line frequency variations...
In this paper, the Discrete Controller Synthesis (DCS) technique is applied in order to obtain a correct-by- construction automatic distributed scheduling of Wireless Sensor Network (WSN). Our approach starts from an abstract formal model considering that communication between nodes are instantaneous. Then, a refined model is obtained by adding a realistic communication mechanism while preserving...
In this paper, we propose an intermittent control scheme for neural oscillator systems with delay. The aperiodically intermittent controller is designed. Based on the linear matrix inequality, and Lyapunov theory, a sufficient condition is derived. The exponential synchronization of master-response neural oscillator systems can be ensured based on designed intermittent controller. Numerical simulation...
This paper investigates causal consensus problem of a class of singular (descriptor) multi-agent systems with network delays, fixed topology. For the studied systems, different from traditional open-loop prediction approach, a pseudo predictor based on closed-loop artificial system is proposed to predict the future state. For the time-varying delay, a data-receiving policy is proposed to turn it into...
The synchronized trajectory tracking control problem of multiple mobile robots under actuator faults is studied in this paper. We take the communication delays into consideration in system design and do not require that the network topology is symmetric. A distributed control design approach is proposed by incorporating the synchronized formation control method and a sufficient condition is obtained...
Modeling and analysis of non–functional properties is crucial in energy-aware real-time (ERT) automotive systems. EAST-ADL is an architectural language dedicated to safety critical automotive embedded system design. We have previously modified EAST-ADL to include energy constraints and transformed ERT behaviors modeled in EAST-ADL/STATEFLOW into UPPAAL models amenable to formal verification. Previous...
The problem of search for delay of broadband signals on the basis of code sequences is considered. The problem arises when using long code sequences in conditions of limited signal observation time and high requirements to reliability and synchronization accuracy. In these conditions use of various non-optimal methods and search algorithms, in particular, sequential-parallel search, consecutive algorithms...
Frequency synchronization of a distributed measurement system requires the transfer of an accurate frequency reference to all nodes. The use of a general-purpose packet-based network for this aim is analyzed in this paper, where oversampling is considered as a means to counter the effects of packet delay variation on time accuracy. A comprehensive analysis that includes the stability of the local...
We consider a collision channel model without feedback based on a time-slotted communication channel shared by K users. In this model, packets transmitted in the same time slot collide with each other and are unrecoverable. Each user accesses the channel according to an internal periodical pattern called protocol sequence. Due to the lack of feedback, users cannot synchronize their protocol sequences,...
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