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in this paper a combination between fractional order sliding mode control (FOSMC) and pole-placement is introduced for non-linear systems with uncertain disturbances. A sliding surface with a fractional order PID form is given, in which the eigenvalues of the reduced state equation of the errors are forced to be negative via the pole-placement method. The control law is designed based on the Lyapunov...
An approach based on the discrete-time adaptive distributed observer was recently proposed to solve the cooperative output regulation problem for discrete-time linear multi-agent systems. The validity of this approach relies on the assumptions that the solution to the regulator equations is unique and all the eigenvalues of the leader's system matrix are inside or on the unit circle. In this paper,...
We develop an algorithm that can detect the identity of false data-injection attackers in distributed optimization loops for estimating oscillation modes in power system models when the measurements used for the estimation are noisy. The fundamental set-up for the optimization is based on a distributed version of total least-squares (TLS) executed via Alternating Direction Multiplier Method (ADMM)...
This paper proposes a finite difference spatial discretization scheme that preserve the port-Hamiltonian structure of 1D and 2D infinite dimensional hyperbolic systems. This scheme is based on the use of staggered grids for the discretization of the state and co state variables of the system. It is shown that, by an appropriate choice of the boundary port variables, the underlying geometric structure...
Based on core problems of personalized recommendation, traditional collaborative filtering recommendation algorithm and theories of AprioriAll algorithm based on association rule, it is proposed to build two-dimension user interest model combining user's implicit and explicit interests and increase the threshold value of third dimension time in this paper t o realize the real-time personalized recommendation...
According to the fact that digital images mainly contain Gauss and salt & pepper noise, an anisotropic hybrid diffusion model with source term was proposed in this paper. Traditional edge-enhancing and coherence-enhancing models had the contrast between coherent structures and the background decreased while having the image denoised. In this paper a source term was introduced into the diffusion...
Accurate eigenvalues of nonzero-integer spherical wave functions of coaxial and biconical structures are determined for both TE and TM fields. It is found that the number of the eigenvalues is equal to the order of the characteristic equations, i.e., the order of the related associated Legendre functions and their derivatives. For each TE mode there is a unique nontrivial eigenvalue, which is the...
Aiming at the k-nearest neighbors algorithm for scatter point cloud data, an improve method has been proposed based on dimension reduction and sorting. In the improved algorithm, the main directions of point cloud data need to be solved according to PCA (Principal Components Analysis) to analyze the spatial distribution of point cloud data. After that, rotate the main directions to coincide with the...
We are investigating countermeasure techniques against electric noise on telecommunication and related equipment. There are many types of electric noise, and we focus on the characterization of transient noise such as the switching noise of switching power supplies. We are developing a method of transient signal analysis based on linear predictive coding (LPC) for the purpose. Unfortunately, as standard...
A new model order reduction (MOR) technique of multi-input multi-output (MIMO) systems utilizing the firefly optimization method is presented in this paper. The reduction operation is proposed to maintain the exact dominant dynamics in the reduced order model with the advantage of substructure preservation. This is mainly possible for systems that are characterized as multi-time scale systems. Obtaining...
Design of filters for graph signal processing benefits from knowledge of the spectral decomposition of matrices that encode graphs, such as the adjacency matrix and the Laplacian matrix, used to define the shift operator. For shift matrices with real eigenvalues, which arise for symmetric graphs, the empirical spectral distribution captures the eigenvalue locations. Under realistic circumstances,...
Joint EigenValue Decomposition (JEVD) algorithms are widely used in many application scenarios. These algorithms can be divided into different categories based on the cost function that needs to be minimized. Most of the frequently used algorithms in the literature use indirect least square (LS) criteria as a cost function. In this work, we perform a first order perturbation analysis for the JEVD...
This paper presents a novel approach for enhancing the efficiency of the design process of microwave devices by means of the finite element method. It combines mesh morphing with local model order reduction (MOR) and yields parametrized macromodels that can be used to significantly reduce the number of variables in the FEM system of equations and acceleration of computer simulation. A projection basis...
Wireless telemetry systems from the earth's surface to downhole antennas used in oil and gas exploration generally exploits the annulus between the casing and the tubing as a transmission media. This problem can be efficiently analyzed with a mode-matching technique (MMT), which only require modest computational resource to evaluate the propagation along the entire oil well. Prior MMT results have...
In this paper the mode matching (MM) technique is utilized to find the dispersion curve of a regular microstrip line. To convert the algebraic equations to a matrix form, a method is invoked which is similar to the well-known point matching (PM) technique. The results of this hybrid technique (MM-PM) are in close agreement with those from published work.
In this paper the spectrum of corrugated circular waveguides will be computed from classical matrix eigenvalues. Both cases of single and dual-depth corrugations are shown. The eigenvalue problem is formulated by means of generalized scattering matrix extracted from HFSS or any other 3D field solver where the eigenvalues are directly related to the propagation constants. New techniques to force the...
Transverse problem in coaxial regions leads to the well known Bessel equation. Solution of this equation is in the form of Fourier-Bessel expansion of which eigenvalues are determined by the appropriate transcendental equations. In electromagnetics, two symmetric cases: Dirchlet-Dirichlet (D-D) and Neumann-Neumann (N-N) are fundamental both from practical and theoretical points of view. The first...
A new Full Wave Finite Difference (FWFD) is proposed which is capable of evaluating field patterns of guided wave structures simultaneously and efficiently. Unlike the traditional finite difefrence methods, its formulation is based on all six vector field components.
Results of a nonlinear simulation is used in this paper to identify a linear model of a black-boxed synchronous machine. Linear system identification methods such as Prony Analysis, are employed to identify linear models of power system devices when their complete mathematical models are not available to be included in small signal stability studies. While the user lacks the knowledge of the control...
In this paper, characteristic modes involved in smart phone are analyzed using the available CMA code in the comprehensive 3D electromagnetic field solver HW (HyperWorks) FEKO. A typical design workflow of characteristic mode analysis is considered to meet design specifications. It includes investigation of the structure, excitation of the correct modes, and verification of the design parameters....
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