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In this paper we introduce a novel combination of Sign Inverting Control (SIC) and Delay Scheduling (DS) concepts for systems with multiple rationally independent and large delays. The combined scheme functions with a single premise that, the union of a proper choice of control and its sign inverted version (SIC) would provide a larger stable operating region in the domain of the delays. The outstanding...
A system of homogeneous differential-difference equations with linearly increasing delay is considered. The sufficient conditions of the asymptotic stability of the zero solution are given. Razumikhin's method to estimate the solutions is applied. The results can be used for the stabilization of controllable systems as well as the charged particle beams.
The 4G standard Long Term Evolution (LTE) utilizes discontinuous reception (DRX) to extend the user equipments battery lifetime. DRX permits an idle UE to power off the radio receiver for two predefined sleep period and then wake up to receive the next paging message. Two major basic power saving models proposed to data are the 3GPP ETSI model and industrial DRX model proposed by Nokia. While previous...
IEEE 802.15.4 Medium Access Control (MAC) layer does not include the Request-To-Send/Clear-To-Send (RTS/CTS) handshake mechanism, in order to overcome the hidden node problem that affects Wireless Sensor Networks (WSNs). In this paper we propose and analyse the use of RTS/CTS in IEEE 802.15.4 for the nonbeacon-enable mode. The proposed solution shows that by considering the RTS/CTS mechanism combined...
Time-delay naturally appears in many control systems, and it is frequently a source of instability. However, for some systems, the presence of delay can have a stabilizing effect. Therefore, stability and control of time-delay systems is of theoretical and practical importance. Modern control systems usually employ digital technology for controller implementation, i.e. sampled-data control. A time-delay...
In this paper, we address the second-order consensus problem for networked mechanical systems on a directed topology in the case of existence of nonuniform communication delays. To realize the goal of second-order consensus, we propose an adaptive consensus scheme that consists of an adaptive controller and a distributed velocity observer. It is demonstrated that the position and velocity consensus...
In this paper, we consider the delay-dependent robust stabilization of uncertain stochastic system with time-varying delay using Lyapunov-Krasovskii (LK) functional approach. By exploiting a candidate LK functional and using free-weighting matrices in the delay-dependent analysis, a less conservative sufficient condition for the existence of a memoryless state feedback controller. A numerical example...
This paper proposes a robust integral sliding mode (RISM) manifold and the corresponding design method of stabilization control law for uncertain systems with control input time delay. Delay-independent sufficient condition for the existence of the RISM surface is given in terms of LMI, and the sliding mode control (SMC) law which can keep system stay on the neighborhood of the RISM surface in finite...
This paper investigates the consensus control of a class of Lipchitz nonlinear multi-agent systems with communication time delay. The proposed control only uses relative state information of the system. An optimal consensus control is then identified through a careful exploitation of the structure of Laplacian matrix and semi-discretization method.
Paper presents on-line cooperation of two advanced signal processing methods which are used for the best adaptation of LQ controller during stabilization of continuous linear system CLS in which abrupt changes of parameters have occurred. First processing algorithm is connected with special modification of modulating functions method MFM operating in two moving windows for fast identification of step...
This paper discusses the networked predictive control with communication delay and data loss in feedback channel under limit-bandwidth through a single value. A networked predictive control scheme is used to actively compensate for the communication delay and data loss. Based on the analysis of the closed-loop networked predictive control systems, a design strategy and detail steps is proposed. The...
The paper proposes an online method to analyze the root cause of alarms arisen in industrial process variables. The relation among alarm variables is described by discrete Bayesian networks. A special network structure is considered, where only one child node exits so that its abnormal state is caused by one or multiple parent nodes. The root cause of alarms arisen in the child node is analyzed, by...
Signal shaping technique can be distinguished as a very effective tool for suppressing both single and multiple oscillatory modes of a system linked with the shaper. Utilizing the concept of inverse signal shapers placed in the feedback loop, the double oscillatory mode suppression is addressed, considering that the oscillations induced by both the reference signal and the disturbance changes are...
In this paper we illustrate the use of a state space approach for the analysis of left-handed transmission lines, where an RLC equivalent circuit model is used to represent the transmission line. Steady state S-parameter frequency responses can be obtained directly from the state matrices, whereas the temporal response for arbitrary input excitations requires solution of the state equation. Validation...
This work considers message coding on a transport layer of data network using error correcting codes. Initially transport coding was presented with constant coding rate [1]. This work suggests usage of variable coding rate by recoding messages on some intermediate nodes of data network. The work contains analysis of recoding efficiency based on analytical model and simulation of Kleinrock network...
A state predictor control scheme is presented in this paper. The predictor is based on the Fundamental Calculus Theorem and its stability analysis is proved using the Backstepping approach. The proposed predictor-control scheme is validated in the nonlinear model of a quadrotor vehicle with delayed inputs. In order to prove its robustness in simulation, noise and dropout data are included in the emulation...
Infrastructure-as-a-Service (IaaS), which is offered by cloud computing, has focused on providing computing and storage resources, considering network mostly as a required communication accessory and not as a resource itself. In other words, the ability to define network resources (e.g. routing/switching elements, bandwidth, delay) is still very limited. However, the need to have more robust solutions...
Source localization using spherical microphone arrays has received attention due to the ease of array processing in the spherical harmonics (SH) domain with no spatial ambiguity. In this paper, we address the issue of near-field source localization using a spherical microphone array. In particular, three methods that jointly estimate the range and bearing of multiple sources in the spherical array...
The data communication between network nodes can be realized over more than one transmission path. These paths can be utilized in different ways; either to obtain better throughput or to obtain redundancy of transmitted data. The purpose of this paper is to present an analysis of the innovative two-path data transmission scheme with the focus on data redundancy. The proposed scheme uses a network...
NBTI (Negative Bias Temperature Instability) is a major concern in long-time circuit performance. In this paper, NBTI degradation models of basic logic gates have been developed based on the conventional reaction-diffusion (R-D) model which is used to predict the threshold voltage shift (ΔVTH) of p-type MOSFET. Besides load capacitance (CL), input slew rate (ti) and supply voltage (VDD), ΔVTH versus...
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