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In this paper, a novel ultrawideband (UWB) antenna with co-planar waveguide (CPW) feed is presented. The antenna is based on an egg-shaped conductor printed on a 30??40 mm2 FR4 substrate of 1.6-mm thickness. Two configurations of the antenna are studied. In the first, the ground plane features a large egg-shaped slot, and in the second, the ground plane is partial and rectangular in shape. The measured...
The contribution is concerned on the properties of the new ideal circuit element, a memristor. By definition, a memristor relates the charge q and the magnetic flux ?? in a circuit, and complements a resistor R, a capacitor C, and an inductor L as an ingredient of ideal electrical circuits. The properties of these three elements and their circuits are a part of the standard curricula. The existence...
Watermarking techniques are proposed as a solution to copyright protection of digital media files. Watermarking algorithms are mainly concentrated on spatial or spectral domains. In this work, a robust and high capacity watermarking method that is based on spatio-frequency (SF) representations is presented. We use the discrete evolutionary transform (DET) to represent an image in the SF domain. A...
In this paper, two new circuits for realization frequency dependent negative resistance (FDNR) depending on the passive component selection are proposed. Also, two FDNRs using a canonical number of elements, a CFOA, two resistors and maximum two capacitor, are developed. The proposed FDNR circuits do not need critical component matching constraints. Also, simulation results using SPICE program are...
This paper deals with the modified current-feedback operational amplifier (MCFOA) that is used in two voltage-mode (VM) frequency filters. Both structures presented employ single active and five passive elements. Circuits enable realizing a low- (LP), band- (BP), and high-pass (HP) filter responses without changing the circuit topology. There is no requirement for additional component or rotation...
Horn Antenna for millimeter-wave application has been analyzed by two methods, the first one is an asymptotic one which is the aperture integration based on the geometrical optics (GO), the second one is a numerical method based on the well known moment method and improved by wavelets. The aim of this work is first to introduce the application of wavelet in electromagnetic scattering, secondly a comparison...
Synchronization of completely different chaotic systems via active controllers is investigated. Chaos synchronization using active controllers is generalized for different chaotic systems. Two completely different Lorenz and Rossler systems are considered for synchronization and numerical simulations are presented graphically to confirm the validity of the proposed method.
In this study, an autonomous underwater vehicle (AUV) model with six degrees of freedom is presented to be shown having been linearized under several working conditions. Sliding Mode Control Law which is derived from linear theory is applied autonomous underwater vehicle for yaw steering plane. Simulation study is given to show that sliding mode controller designed assuming small states variation...
The following topics are dealt with: hybrid dual site engineering course design; phasor measurements; power system restoration; power system reliability monitoring; energy sources and power markets; electric power systems; electrical machines and drives; power electronics; electrical materials and high voltage technique; electric power systems.
A sliding mode control scheme combined with a nonlinear observer is proposed for control of uncertain chaotic systems. The control design is based on Lyapunov direct method for dealing with uncertainties with known bounds. Second and third order chaotic systems whose states are estimated through a nonlinear observer are stabilized by the sliding mode control. The numerical results are presented to...
This paper presents a novel approach for evaluating the reliability of protective systems taking into account its components reliability. In this paper, a previously proposed extended model is used for directional overcurrent scheme. In the extended model, the impacts of individual protective components are taken into account. An optimum routine test schedule is determined for each protective component...
This paper presents a new control strategy for controlling a group of distributed static series compensators (DSSCs) that can be clamped onto an existing power line and have the ability to change the series impedance of the line in order to control the flow of power. A harmonic analysis of an electromagnetic model of the DSSC is also presented in PSCAD/EMTDC to investigate the amount of harmonic injection...
The power consumption of a standard SRAM during read/write operations is dependent on the address applied, the data accessed, and the type of access (read/write). The power analysis resistant SRAM structure developed during the Project ??SCARD?? (Side Channel Analysis Resistant Design Flow) of the European Community 6. Framework Program reduces the dependency of power consumption on data and address...
In statistical signal processing, parametric modeling of non-Gaussian processes experiencing noise interference is a very important research area. The autoregressive moving average (ARMA) model is the most general and important tool of modeling system. This paper develops an algorithm for the selection of the proper ARMA model orders. The proposed technique is based on forming a third order cumulant...
Regarding the change of slot in high voltage synchronous generators, and the importance of slot leakage reactance in subtransient and transient short circuit currents and in the amount of synchronous reactance, this paper studies the effect of the changing of slot and conductor shape in high voltage synchronous on the amount of slot leakage reactance, using analytical formula and numerical analysis...
Our paper deals with description of the Contact center parts by mathematical models and prediction of traffic in the Contact centers. This knowledge is useful issue during design of the Contact center. The model of the Contact center is one of the options how we can estimate the traffic and important parameters of Contact center. In our work we deal with the description of the Contact center components...
A sine signal synchronous to the power system voltage signal is required in most power electronics based industrial applications. In this study, a phase locked loop (PLL) and direct look-up table (DLT) based hybrid sine oscillator is developed, and sinusoidal signals of the desired frequency that is synchronous to the reference input signal is generated in real time applications carried out with the...
Deficiencies like unbalanced voltages or harmonics in the voltage source could result in problems like excessive losses, over-voltages, mechanical oscillations, and interference with control electronics. Detecting these abnormal conditions in the machine is of great importance in the interaction of the electrical machine and the power grid. In this paper the effect of the unbalanced voltages, harmonics...
In this study, reduced current measurement control method is investigated for operation of 3-phase 4-wire shunt active power filter (SAPF) under unbalanced and distroted load conditions. The control method is based on Instantaneous Reactive Power theory (IRP) and requires only measuring the source currents to reduce the number of Current Sensors (CSs) needed in the conventional control approach. The...
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