The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper aims to highlight the possibility of interactively determining the performance of dynamic systems using virtual instrumentation which include Matlab scripts, so as through this combination it can obtain the of virtual tools that work as simulators for certain systems or processes.
This paper deals with the three-dimensional Autoregressive (3-D AR) model parameter estimation from noisy data. We develop an algorithm to estimate the transversal AR parameters corresponding to the Quarter-Space (QS) region of support without a priori knowledge of additive noise power. The transversal parameters and the noise variance are both obtained as a solution of a quadratic eigenvalue problem...
The common industrial practice considers static analysis and design for distributed piping system while leaving the solution of problem arising from plant dynamic behaviour to designer experiences and/or to "ad-hoc" developed dynamic simulation models. In this paper, we describe a design methodology which can potentially increase performances, safety and shorten time to market development...
In this paper the trajectory tracking control problem for a certain class of propagation processes modeled as Quasi-Linear Parameter Varying systems is considered. The propagation physical models are generally described by means of PDEs (partial differential equations). However in real world control problems the PDE models are usually converted into ODEs (ordinary differential equations) models adopting...
This work considers efficient methods for the optimal control of a bilinear distributed parameter system representing the evolution of a scalar field in a fluid flow. The aim is to influence the flow field in order to maximize fluid mixing. The cost by which performance is judged is the ‘mix-norm’ defined in Mathew, Mezic and Petzold (Physica D 2005). The problem is particularly challenging as a large...
A novel linearized model for the transition control problem in plane Poiseuille flow has been proposed recently. The model is based on a finite difference approach in streamwise direction and a spectral approach in wall normal direction. It is thus valid for all spatial frequencies and can be used for the synthesis of controllers for flow control problems, using recently developed ideas for spatially...
A reasonable dissipative physical model is established for nucleons and meson dynamical system described by Klein-Gordon Schrödinger coupled equations. Using the laser pulse electric control to derive the initial ground state to target excited state will be considered in this paper. A stable semi-discrete approach is experimentally applied to realize the theoretical design of control searching. The...
Bidomain equations are the standard way to model the electric potential in cardiac tissue. They are based on the fact that active cardiomyocytes are present everywhere in the heart, while it is known that non-small regions exist where additional extracellular media take place. These regions, which play an important role in diseased hearts, are often taken into account through ad-hoc rough tuning of...
In today's cloud service market, different providers have very different low-level mechanisms to accommodate various types of policies from their users. Enforcement of policies over multiple cloud provider domains is an intrinsically complex problem for both sides. In reality, cloud providers have to either manually update enforcement mechanisms or negotiate adjusted policies with their users for...
In this paper, a simplified plasma limiter is modeled and simulated based on spectral-element time-domain (SETD) method. Maxwell Equations coupled to fluid model are proposed to describe the physics procession of the gas discharge and the mechanism of the plasma limiter. In order to solve the proposed PDEs, the Galekin's method is employed for the space discretization and the central difference scheme...
In this paper a simple unknown input estimation method for linear time invariant systems is proposed. Here reduce order cumming observer is extended and used for this purpose. The approach is based on the knowledge of generalized matrix inverse. The proposed observer estimate states in presence of unknown input disturbance. Necessary conditions for existence such unknown i/p observer are derived regarding...
The paper presents a discrete design method for tuning of proportional-integral-derivative control loops by using the Smith predictor with feedback filter in order to guarantee better dynamic and target loop specifications for setpoint tracking and disturbance rejection acting on the process with long dead-time. Simulation and experimental essays show that the effectiveness of the dead-time compensating...
We consider centralized wireless networks for users of video streaming services. If the network is congested, wireless channel resources can be insufficient to satisfy all user requests. In this case QoE with some users may heavily degrade (video playback may periodically interrupt due to rebuffering effect, or startup buffering can take an intolerably long time). These negative effects can be partly...
Most existing rat able aspect generating methods for aspect mining focus on identifying and rating aspects of reviews with overall ratings, while huge amount of unrated reviews are beyond their ability. This drawback motivates the research problem in this paper: predicting aspect ratings and overall ratings for unrated reviews. To solve this problem, we novelly propose a topic model based on Latent...
Serial estuarine hydrodynamic and sediment transport model is parallelized by MPI method based on domain decomposition techniques, the parallel model is applied to a hydrodynamic example of tidal current and sediment transport in the estuary and offshore area of Zhejiang in China. The benchmark result shows that MPI method has good parallel effect, whose speedup is accessible to 41 by 80 processors...
Hidden Markov models (HMM) is a probabilistic model consisting of variables representing observations, variables that are hidden, the initial state distribution, transition matrix, and parameters for all observation distributions. The said model is commonly used in speech recognition field and it has seen an increase in terms of usage, which include user profiling in mobile communication networks,...
This paper proposes a method for predicting aircraft flying qualities according to Cooper-Harper rating scale, where neural networks model is used to describe the nonlinear characteristics of pilot control based on experimental data. The relationship between the Cooper-Harper pilot rating and characteristics of a closed-loop aircraft-pilot system is investigated according to the parameters of pilot...
Quasi-synchronization is an important type of synchronization because of the parameter mismatches in the real world, so we will investigate it for a delayed network, which is master-slave coupled. By applying the aperiodically and nonlinearly intermittent control on the network, and assuming the time delay is varying, we will present some useful criteria for exponential quasi-synchronization. The...
We propose a household power consumption simulator with a compact representation of household occupant behaviors. The proposed simulator models a working cycle of occupant behavior using start time intervals and duration. Such easily interpreted and compact parameter representation simplifies the operation processes of the simulator in trials involving energy management services. Based on a numerical...
We study the horizontal shear (SH) wave problem propagating in a functionally graded piezoelectric material (FGPM) layered structure to compare the Wentzel-Kramers-Brillouin (WKB) method with the power series method. We establish coupled governing equations on the basis of elastodynamics theory. Both the WKB and power series methods are employed to solve the second-order variation coefficient equations...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.