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Conventional single phase inverter offers a square wave output which when applied to electrical appliances may damage the later reducing its efficiency and life as this inverter output waveform is not sinusoidal and contains lower and higher order harmonics in addition to fundamental. On the other hand Selective Harmonic Elimination with Pulse Width Modulation (SHE-PWM) offers a fine control of the...
In this paper, an analytical approach is proposed for solving a special set of transcendental equations, which are often encountered for eliminating harmonics in converters. Typically, numerical solutions are used for solving the transcendental equations. The disadvantage of numerical approach is overhead in computational effort as it requires a PC with expensive software and solution time can also...
Relationships among physical quantities (PQs) express fundamental laws of the Universe. Physics equations represent relationships among PQs and therefore encode the basic knowledge of physics. System of PQs is the natural framework of physics and can be used as a guideline for informational modelling of various scientific aspects of physics. Relationships among PQs can be used for creation of semantic...
Analysis of cutoff characteristic for TE wave and TM wave is very important to design the geometry of structure (the angle of the cones) for TEM cell. In the paper, take the co-conical line for example. The half angle of inner conical conductor is 10° and that of outer conical conductor is 1.893°. An iteration method programmed in Matlab is used to solve the roots of the transcendental functions....
In this paper we present a method for estimating occlusion of pixels in image sequences. The estimation of the occlusion layer is based on optical flow. In our proposal the optical flow is computed in an exhaustive way by comparing neighborhoods between consecutive images. In order to compute the optical flow we consider three consecutive images (previous, actual and next frame). The optical flow...
This paper presents a new idea to solve the selective harmonic elimination (SHE) equations with non equal dc sources using Hybrid Newton Raphson Method (HNRM). This technique is a combination of genetic algorithm (GA) and Newton Raphson Method (NRM). The HNRM technique effectively eliminates the lower order harmonics from the output voltage of the converter. In this paper, it has been also shown that,...
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...
This paper shows a method for optimization of CHB inverter's harmonic performance under Selective Harmonic Elimination Pulse Width Modulation (SHEPWM) control. The optimization techniques are used for solving the set of non-linear transcendental trigonometrical equations. SHE is implemented to reduce the THD value. The set of non-linear equation is minimized by Big Bang-Big Crunch optimization technique...
This paper proposes a current-mode bandgap reference which employs a novel “coarse” voltage replication to offset the 2nd-order curvature due to base-emitter voltage of the BJT. The coarse replication is based on a process insensitive transcendental equation which regulates the independent CTAT current. The bandgap reference which will be implemented in 0.35µm CMOS process has a low operating current...
Electrical energy generation by using Photovoltaic system is becoming popular day by day. This paper presents a control topology for multilevel inverters used in standalone PV system. A hybrid technique is used to optimize the switching angles of thirteen levels single-phase cascaded multilevel inverter for selective harmonics elimination. The nonlinear transcendental equations problem is solved by...
A numerical approach to calculate multivariate transcendental equations in complex number domain that can be applied to solve dispersion equation is presented here. The mathematical derivations of the convergence of the moduli of the equations around null point are presented strictly, when the transcendental equation is univariate. Similar process also applies to the case when the equations are multivariate...
Haptics technology deals with sense of touch and kinesthetic learning through actuators. Haptics classified into human Haptics, machine Haptics, and virtual augmented reality. This review paper focuses on explaining Haptics through texture modeling of various surfaces through measuring tool classification. Equations, errors and future applications of Haptics through texture identification.
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.
In this paper an approach for integration between GPS and inertial navigation systems (INS) is described. The continuous-time navigation and error equations for an earth-centered earth-fixed INS system are presented. Using zero order hold sampling, the set of equations is discretized. An extended Kalman filter for closed loop integration between the GPS and INS is derived. The filter propagates and...
A new method for generating and animating a 3-D model of a person's face is proposed. The method involves novel algorithms for 2-D to 3-D construction under perspective projection model, real-time mesh deformation using a lower-resolution control mesh, and texture image creation that involves texture blending in 3-D. The resulting face models can be readily used in 3-D games, mobile messaging, e-learning...
In this paper we propose a novel motion filtering approach that takes into consideration the existence of certain system constraints with respect to the amount of the corrective rotational and translational motions that can be applied on each video frame for stabilization. The interdependence between rotational and translational constraints is considered, and a modified Kalman filtering algorithm...
In this work, tracking analysis of variable normalized least mean fourth (XE-NLMF) algorithm is carried out in the presence of two sources of nonstationarites: 1) carrier frequency offset between transmitter and receiver and 2) random variations in the environment. A novel approach to this analysis is carried out here using the concept of energy conservation. Close agreement between analytical analysis...
The presence of optical turbulence in video acquired by cameras viewing scenes at long distances can contribute significantly to degradation. This problem arises routinely, for example, in astronomy where objects of interest reside beyond the earth's atmosphere. Optical turbulence introduces time-varying perturbations in the images as well as blurring. In this paper, we introduce a method for suppressing...
The Radial Basis Function method (RBF) can be used not only for reconstruction of a surface from scattered data but for reconstruction of damaged images, filling gaps and for restoring missing data in images, too. The basic idea of reconstruction algorithm with RBF and very interesting results from reconstruction of images damaged by noise are presented. Feasibility of the RBF method for image processing...
This paper develops a theoretical model for the formation of transparent overlays and proposes a temporal algorithm to detect them independent of their degree of transparency. The proposed algorithm exploits our novel observation that the appearance of a transparent overlay results in a proportionally constant decrease in the intensity variance. In order to detect transparent regions, we first compute...
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