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25,002 Article Results

Low bit Rate Video Quality Analysis Using NRDPF-VQA Algorithm

10.11591/ijece.v5i1.pp71-77
Subrahmanyam CH , Venkata Rao D , Usha Rani N
In this work, we propose NRDPF-VQA (No Reference Distortion Patch Features Video Quality Assessment) model aims to use to measure the video quality assessment for H.264/AVC (Advanced Video Coding). The proposed method takes advantage of the contrast changes in the video quality by luminance changes. The proposed quality metric was tested by using LIVE video database. The experimental results show that the new index performance compared with the other NR-VQA models that require training on LIVE video databases, CSIQ video database, and VQEG HDTV video database. The values are compared with human score index analysis of DMOS.
Volume: 5
Issue: 1
Page: 71-77
Publish at: 2015-02-01

FPGA Based V/f Control of Three Phase Induction Motor Drives Integrating Super-Lift Luo Converter

10.11591/ijpeds.v5.i3.pp393-403
Elangovan P , Nalin Kant Mohanty
The significance of Elementary Positive Output Super-Lift Luo Converter (EPOSLLC) in constant Voltage/Hertz (V/f) controlled Induction Motor (IM) drive is presented. The traditional IM drive which integrates phase controlled rectifier or boost converter in the facade end upshot tribulations like DC link fluctuations and deprived DC link voltage level. To overcome the problem, the conventional DC-DC converter is replaced with Proportional plus Integral (PI) controlled EPOSLLC in the front end of IM drive that produce the DC link voltage in geometric progression. The Voltage Source Inverter (VSI) of the suggested system renders both open loop and closed loop V/f control scheme for IM by feedback regulated Sinusoidal Pulse Width Modulation (SPWM) technique. Simulation and experimental works are conceded and results presented to demonstrate the viability of the proposed approach. Simulation is carried out using MATLAB /SIMULINK software and the experimental setup is built with Field Programmable Gate Array (FPGA) Spartan-6 processor. The anticipated EPOSLLC is found fit for V/f controlled IM drives considering the DC link Voltage, Speed response of IM and Total Harmonic Distorion (THD) in IM current.
Volume: 5
Issue: 3
Page: 393-403
Publish at: 2015-02-01

A High Gain Observer Based Sensorless Nonlinear Control of Induction Machine

10.11591/ijpeds.v5.i3.pp305-314
Benheniche Abdelhak , Bensaker Bachir
In this paper a sensorless Backstepping control scheme for rotor speed and flux control of induction motor drive is proposed. The most interesting feature of this technique is to deal with non-linearity of high-order system by using a virtual control variable to render the system simple. In this technique, the control outputs can be derived step by step through appropriate Lyapunov functions. A high gain observer is performed to estimate non available rotor speed and flux measurements to design the full control scheme of the considered induction motor drive. Simulation results are presented to validate the effectiveness of the proposed sensorless Backstepping control of the considered induction motor.
Volume: 5
Issue: 3
Page: 305-314
Publish at: 2015-02-01

Similarity and Variance of Color Difference Based Demosaicing

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4199
R. Niruban , T.Sree Renga Raja , R. Deepa
The aim of the project is to find the missing color samples at each pixel location by the combination of similarity algorithm and the variance of colour difference algorithm. Many demosaicing algorithms find edges in horizontal and vertical directions, which are not suitable for other directions. Hence using the similarity algorithm the edges are found in different directions. But in this similarity algorithm sometimes the horizontal and vertical directions are mislead. Hence this problem can be rectified using the variance of colour difference algorithm. It is proved experimentally that this new demosaicing algorithm based on similarity and variance of colouyr difference has better colour peak signal to noise ratio (CPSNR). It has better o0bjective and subjective performance. It is an analysis study of both similarity and colour variance algorithms. DOI: http://dx.doi.org/10.11591/telkomnika.v13i2.7048 
Volume: 13
Issue: 2
Page: 238-246
Publish at: 2015-02-01

Radial Basis Function Network Learning with Modified Backpropagation Algorithm

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4215
Usman Muhammad Tukur , Siti Mariyam Shamsuddin
Radial Basis Function Network (RBFN) is a class of Artificial Neural Network (ANN) that was used in many classification problems in science and engineering. Backpropagation (BP) algorithm is a learning algorithm that was widely used in ANN. However, BP has major disadvantages of slow error rate convergence and always easily stuck at the local minima. Hence, Modified BP algorithm was proposed in this study to improve the learning speed of RBFN using discretized data. C programming language was used to develop the program for the proposed method. Performance measurement of the method was conducted and the experimental results indicate that our proposed method performs better in error rate convergence and correct classification compared to the result with continuous dataset. T-test statistical analysis was used to check the significance of the results and most were found to be satisfactorily significant. DOI: http://dx.doi.org/10.11591/telkomnika.v13i2.7032 
Volume: 13
Issue: 2
Page: 369-378
Publish at: 2015-02-01

Buck-Boost Control of Four Quadrant Chopper using Symmetrical Impedance Network for Adjustable Speed Drive

10.11591/ijpeds.v5.i3.pp424-432
Saswati Swapna Dash , Byamakesh Nayak
This paper proposes buck-boost capabilities of four quadrant chopper for wide range speed control of DC motor drives using symmetrical impedance network called Z-source network. By controlling the shoot through duty ratio from 0 to 0.5 and non-shoot through techniques, the Z-source four quadrant choppers can produce any desired DC voltage across the DC motor. The switching patterns for both buck and boost operations are presented to achieve four modes of operation of DC motor. As a result, the proposed model will have ride through capability during voltage sags, manage during voltage swells, used in any types of DC voltage sources such as fuel cell and solar cell and improve the reliability by reducing EMI noise. Analysis and simulation results are presented to demonstrate these new findings.
Volume: 5
Issue: 3
Page: 424-432
Publish at: 2015-02-01

A Universal Formula for Asymptotic Stabilization with Bounded Controls

10.11591/ijece.v5i1.pp111-118
Muhammad Nizam Kamarudin , Abdul Rashid Husain , Mohamad Noh Ahmad , Zaharuddin Mohamed
Motivated by Artstein and Sontag universal formula, this brief paper presents an explicit proof of the universal formula for asymptotic stabilization and asymptotic disturbance rejection of a nonlinear system with mismatched uncertainties and time varying disturbances. We prove the stability via Lyapunov stability criteria. We also prove that the control law satisfies small control property such that the magnitude of the control signal can be bounded without the catastropic effect to the closed loop stability. For clarity, we benchmark the proposed approach with other method namely a Lyapunov redesign with nonlinear damping function. We give a numerical example to verify the results.
Volume: 5
Issue: 1
Page: 111-118
Publish at: 2015-02-01

Performance Analysis of a DTC and SVM Based Field-Orientation Control Induction Motor Drive

10.11591/ijpeds.v5.i3.pp336-343
Md. Rashedul Islam , Md. Maruful Islam , Md. Kamal Hossain , Pintu Kumar Sadhu
This study presents a performance analysis of two most popular control strategies for Induction Motor (IM) drives: direct torque control (DTC) and space vector modulation (SVM) strategies. The performance analysis is done by applying field-orientation control (FOC) technique because of its good dynamic response. The theoretical principle, simulation results are discussed to study the dynamic performances of the drive system for individual control strategies using actual parameters of induction motor. A closed loop PI controller scheme has been used. The main purpose of this study is to minimize ripple in torque response curve and to achieve quick speed response as well as to investigate the condition for optimum performance of induction motor drive. Depending on the simulation results this study also presents a detailed comparison between direct torque control and space vector modulation based field-orientation control method for the induction motor drive.
Volume: 5
Issue: 3
Page: 336-343
Publish at: 2015-02-01

Detection of Atrial Fibrillation using Autoregressive modeling

10.11591/ijece.v5i1.pp64-70
Kora Padmavathi , K.Sri Ramakrishna
A‎atrial fibrillation (AF) is the arrhythmia that commonly causes death in the adults. We measured AR coefficients using Burg’s method for each 15 second segment of ECG. These features are classified using the different statistical classifiers: kernel SVM and KNN classifier. The performance of the algorithm was evaluated on signals from MIT Physionet database.. The effect of AR model order and data length was tested on the classification results. This method shows better results can be used for practical use in the clinics.‏
Volume: 5
Issue: 1
Page: 64-70
Publish at: 2015-02-01

A Tactical Chaos based PWM Technique for Distortion Restraint and Power Spectrum Shaping in Induction Motor Drives

10.11591/ijpeds.v5.i3.pp383-392
V. Mohan , N. Stalin , S. Jeevananthan
The pulse width modulated voltage source inverters (PWM-VSI) dominate in the modern industrial environment. The conventional PWM methods are designed to have higher fundamental voltage, easy filtering and reduced total harmonic distortion (THD). There are number of clustered harmonics around the multiples of switching frequency in the output of conventional sinusoidal pulse width modulation (SPWM) and space vector pulse width modulation (SVPWM) inverters. This is due to their fixed switching frequency while the variable switching frequency makes the filtering very complex. Random carrier PWM (RCPWM) methods are the host of PWM methods, which use randomized carrier frequency and result in a harmonic profile with well distributed harmonic power (no harmonic possesses significant magnitude and hence no filtering is required). This paper proposes a chaos-based PWM (CPWM) strategy, which utilizes a chaotically changing switching frequency to spread the harmonics continuously to a wideband and to reduce the peak harmonics to a great extent. This can be an effective way to suppress the current harmonics and torque ripple in induction motor drives. The proposed CPWM scheme is simulated using MATLAB / SIMULINK software and implemented in three phase voltage source inverter (VSI) using field programmable gate array (FPGA).
Volume: 5
Issue: 3
Page: 383-392
Publish at: 2015-02-01

Robust Synchronization of the Unified Chaotic System

10.11591/ijece.v5i1.pp102-110
Hatem Trabelsi , Mohamed Benrejeb
The paper investigates the synchronization problem of the unified chaotic system. The case of identical, but unknown master and slave unified chaotic systems is considered. Based on compound matrices formalism, a unified synchronization control scheme is proposed independently of the unknown system parameter. Simulation results are provided to show the effectiveness of the presented scheme.
Volume: 5
Issue: 1
Page: 102-110
Publish at: 2015-02-01

FPGA-Based Implementation Direct Torque Control of Induction Motor

10.11591/ijpeds.v5.i3.pp293-304
Saber Krim , Soufien Gdaim , Abdellatif Mtibaa , Mohamed Faouzi Mimouni
This paper proposes a digital implementation of the direct torque control (DTC) of an Induction Motor (IM) with an observation strategy on the Field Programmable Gate Array (FPGA). The hardware solution based on the FPGA is caracterised by fast processing speed due to the parallel processing. In this study the FPGA is used to overcome the limitation of the software solutions (Digital Signal Processor (DSP) and Microcontroller). Also, the DTC of IM has many drawbacks such as for example; The open loop pure integration has from the problems of integration especially at the low speed and the variation of the stator resistance due to the temperature. To tackle these problems we use the Sliding Mode Observer (SMO). This observer is used estimate the stator flux, the stator current and the stator resistance. The hardware implementation method is based on Xilinx System Generator (XSG) which a modeling tool developed by Xilinx for the design of implemented systems on FPGA; from the design of the DTC with SMO from XSG we can automatically generate the VHDL code. The model of the DTC with SMO has been designed and simulated using XSG blocks, synthesized with Xilinx ISE 12.4 tool and implemented on Xilinx Virtex-V FPGA.
Volume: 5
Issue: 3
Page: 293-304
Publish at: 2015-02-01

Robust SINS/GNSS Integration Method for High Dynamic Applications

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/4206
Falin Wu , Hengyang Zhao , Yan Zhao , Haibo Zhong
As high dynamic movement is always accompanied by colored noise which lacks of mathematical model, traditional Kalman filtering based on an assumption of white Gaussian noise always faces serious divergence. To enhance the performance in high dynamic environment with uncertain colored noise, a kind of robust filtering based on H-infinity technology isdeveloped. State model of the algorithm is derived from SINS error propagation. Both position and velocity errorsare used as the measurements. A simulation system which includes a tri-axial turntable and a GNSS signal simulator is used to verify the integration design under high dynamic environment. Simulation results proved that both the accuracy and robustness of the integration design have been improved significantly.DOI: http://dx.doi.org/10.11591/telkomnika.v13i2.6876 
Volume: 13
Issue: 2
Page: 292-299
Publish at: 2015-02-01

A Novel Approach of Position Estimation and Power Factor Corrector Converter Fed BLDC Motor

10.11591/ijpeds.v5.i3.pp415-423
S. Kaliappan , R. Rajeswari
This paper proposes a Power factor Corrected (PFC) Bridgeless Buck-Boost converter fed BLDC motor drive. The Bridgeless configuration eliminates the Diode Bridge Rectifier in order to reduce the number of components and the conduction loss. The position sensors used in BLDC drives have drawbacks of additional cost, mechanical alignment problems. These bottle necks results in sensorless technique. The Sensorless technique mostly relies on measurement of Back EMF to determine relative positions of stator and rotor for the correct coil energising sequence can be implemented. This paper introduces the offline Finite Element method for sensorless operation. The proposed sensorless scheme estimates the motor position at standstill and running condition. The obtained Power Factor is within the acceptable limits IEC 61000-3-2. The proposed drive is simulated in MATLAB/Simulink the obtained results are validated experimentally on a developed prototype of the drive.
Volume: 5
Issue: 3
Page: 415-423
Publish at: 2015-02-01

Analysis of Variable Speed PFC Chopper Fed BLDC Motor Drive

10.11591/ijpeds.v5.i3.pp326-335
A Jeya Selvan Renius , K Vinoth Kumar
This paper provides the detailed analysis of the DC-DC chopper fed Brushless DC motor drive used for low-power applications. The various methods used to improve the power quality at the ac mains with lesser number of components are discussed. The most effective method of power quality improvement is also simulated using MATLAB Simulink. Improved method of speed control by controlling the dc link voltage of Voltage Source Inverter is also discussed with reduced switching losses. The continuous and discontinuous modes of operation of the converters are also discussed based on the improvement in power quality. The performance of the most effective solution is simulated in MATLAB Simulink environment and the obtained results are presented.
Volume: 5
Issue: 3
Page: 326-335
Publish at: 2015-02-01
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