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25,002 Article Results

On-line Signature Verification based on Pen Inclination and Pressure Information

https://ijece.iaescore.com/index.php/IJECE/article/view/5348
Jungpil Shin , Tetsuya Takanashi
In this paper, the features that have personal characteristic using pen inclination and pressure information are discussed. Forging a pen inclination and pressure information is difficult because it is not visible. Four features using invisible information are proposed and their characteristics are discussed. Proposed features calculated by physical vector analysis are verified by SVC2004 database using DP matching algorithm. As a result, the new feature named Down improves the recognition rate and reliability. Average of correct verification rate is 94.57 % and variance is 0.667.DOI:http://dx.doi.org/10.11591/ijece.v2i4.474
Volume: 2
Issue: 4
Page: 441-446
Publish at: 2012-08-01

The Modify Version of Artificial Bee Colony Algorithm to solve Real Optimization problems

https://ijece.iaescore.com/index.php/IJECE/article/view/5353
B. Asady , Parvaneh Mansouri , N. Gupta
The Artificial Bee Colony(ABC) algorithm is one of the best applicableoptimization algorithm. In this work, we make some modifications toimprove the ABC algorithm based on convergence speed of solution. Inorder to, we add some conditions to selected food sources by bees. So, ifsolution have been enough near to optimal solution, then further search existaround the food sources. That, this is near to optimal solution because, wecan replace lower and upper bounds of food sources with smaller valuesrelate to last search. Therefore, the new search is near to optimal solution and after some iteration, optimal solution achieves. Finally, we illustrateconvergence speed of the MABC algorithm that is faster than ABCalgorithm. There are some examples.DOI:http://dx.doi.org/10.11591/ijece.v2i4.423
Volume: 2
Issue: 4
Page: 473-480
Publish at: 2012-08-01

Power Transfer Capability & Reliability Improvement in a Transmission Line using Distributed Power- Flow Controller

https://ijece.iaescore.com/index.php/IJECE/article/view/5363
P. Ramesh , M. Damodara Reddy
The Distributed Power Flow Controller (DPFC) is derived from the Unified power-flow controller (UPFC).The DPFC is a solution to control the power flow in a single transmission line. By eliminating the common DC link and distributing the three phase series converters of the UPFC, a new concept of the Distributed Power Flow Controller (DPFC) is achieved. The active power exchange between the two converters, which is through the common dc link in the UPFC, is now through the transmission lines at the third-harmonic frequency in the DPFC. It inherits the advantages of the UPFC and the DFACTS concept, which allow power flow control for multi-line systems with relatively low cost and high reliability without additional cost. This paper presents two types of DPFCs; one is one three phase shunt converter and four three phase series converters. Another model is one three phase shunt converter and nine single phase series converters. By using three phase series converters, no common dc link between shunt and series converters but cost will increases. By using single phase series converters, no common dc link between shunt and series converters and cost also decreases. Detailed simulations are carried out on two- machine systems to illustrate the control features of these devices and their influence to increase power transfer capability and every series converter consists of D-FACTS concept so Reliability also improves because failure of series converters does not effect.DOI:http://dx.doi.org/10.11591/ijece.v2i4.357
Volume: 2
Issue: 4
Page: 553-562
Publish at: 2012-08-01

Demand side management potential at the bharati hospital and research centre

https://ijece.iaescore.com/index.php/IJECE/article/view/5358
Kripachariya Singh Sagolsem , Swati S More
The present paper has the main aim of illustrating some main results obtained from a walk through preliminary energy audit performed on The Bharati Hospitals and Research centre, Pune, India. These results are analyzed in order to determine an optimum consumption pattern and potential of saving in terms of expenditure towards energy cost.DOI:http://dx.doi.org/10.11591/ijece.v2i4.480
Volume: 2
Issue: 4
Page: 511-518
Publish at: 2012-08-01

Automatic Segmentation of Glottal Space from Video Images Based on Mathematical Morphology and the hough Transform

https://ijece.iaescore.com/index.php/IJECE/article/view/5352
Davod Aghlmandi , Karim Faez
Vocal disorders directly arise from the physical shape of the vocal cords. Videostroboscopic imaging provides doctors with valuable information about the physical shape of the vocal cords and about the way these cords move. Segmentation of the glottal space is necessary in order to characterize morphological disorders of vocal folds. One of the main problems with the methods presented is their low level of accuracy. To solve this problem, an automatic method based on Mathematical Morphology edge detection and the Hough transformation is presented in this article to extract the glottal space from the videostroboscopic images presented. This method and two other popular algorithms, histogram and active contour, are performed on 10 sets of videostroboscopy data from excised larynx experiments to compare their performances in analyzing videostroboscopy images. The accuracy in computing glottal area of these methods are investigated. The results show that our proposed method provides the most accurate and efficient detection, and is applicable when processing low-resolution images. In this paper we used edge detection based on geometric morphology to detecting the edges of vocal cords. Then in the next step the edges that were extracted, using Hough transform change to some lines. After that through using proposed algorithm, we omit the extra lines and extract the glottis.DOI:http://dx.doi.org/10.11591/ijece.v2i4.324
Volume: 2
Issue: 4
Page: 463-472
Publish at: 2012-08-01

Determination of Fault Location and Type in Distribution Systems using Clark Transformation and Neural Network

10.11591/ijape.v1.i2.pp75-86
Mohammad Sarvi , S. M. Torabi
In this paper, an accurate method for determination of fault location and fault type in power distribution systems by neural network is proposed. This method uses neural network to classify and locate normal and composite types of faults as phase to earth, two phases to earth, phase to phase. Also this method can distinguish three phase short circuit from normal network position. In the presented method, neural network is trained by αβ space vector parameters. These parameters are obtained using clarke transformation. Simulation results are presented in the MATLAB software. Two neural networks (MLP and RBF) are investigated and their results are compared with each other. The accuracy and benefit of the proposed method for determination of fault type and location in distribution power systems has been shown in simulation results.
Volume: 1
Issue: 2
Page: 75-86
Publish at: 2012-08-01

Design and Development of Power Electronic Controller for Grid-connected PV Array

10.11591/ijape.v1.i2.pp87-92
T. Shanthi
Design and simulation of a simple power electronic interface for grid-connected PV array has been proposed using boost converter and line-commutated inverter with maximum power point tracking (MPPT) controller. The output of PV array varies with irradiation, and hence the duty cycle of the PI controller is adjusted automatically to supply a constant DC voltage to the inverter circuit, the output of which is directly connected to the grid. The MPPT controller extracts maximum power from the solar array and feeds it to the single-phase utility grid. The proposed scheme has been modeled in the MATLAB 7.1 software and the complete system has been simulated for open loop and closed loop configurations. The active power fed to the grid is taken for different firing angles in open loop mode and the firing angle for maximum power has been determined. This is compared with the firing angle obtained from the closed loop mode and found that both results agree with each other.
Volume: 1
Issue: 2
Page: 87-92
Publish at: 2012-08-01

Impact of Thyristor Controlled Series Capacitor Insertion on Short-circuit Calculation in Presence Phase to Earth Fault

10.11591/ijape.v1.i2.pp93-104
Mohamed Zellagui , Abdelaziz Chaghi
This research paper presents a study on phase to earth fault short-circuit calculation with fault resistance on a single transmission line 400 kV in eastern Algerian transmission networks at Algerian Company of Electricity and Gas (Sonelgaz Group) compensated by series Flexible AC Transmission System (FACTS) i.e. Thyristor Controlled Series Capacitor (TCSC) installed in midline. The facts are used for controlling transmission voltage, power flow, reactive power, and damping of power system oscillations at high power transfer levels. The direct impacts of TCSC insertion on the total impedance, active power and reactive power a electrical transmission line and also parameters of short-circuit : symmetrical currents, line currents, symmetrical voltages and line voltages are carried out. More the effects of injected voltage by TCSC for three case studies are presented.
Volume: 1
Issue: 2
Page: 93-104
Publish at: 2012-08-01

Dynamic Modeling of Autonomous Wind–diesel system with Fixed-speed Wind Turbine

10.11591/ijape.v1.i2.pp47-64
Najafi Hamid Reza , Dastyar Farshad
Wind turbines have often connected to small power systems, operating in parallel to diesel generators, as is typically the case in autonomous wind–diesel installations or small island systems with high wind potential. Hence, the modeling and analysis of the dynamic behavior of wind–diesel power systems in presence of wind power will be important. In this paper, the system under study is modeled by a set of dynamic and algebraic equations (DAE). Dynamic behavior of a wind-diesel system is investigated by the proposed dynamic model. Wind-diesel system consists of wind turbines that are connected to synchronous diesel generator via short transmission line with local load. Dynamic stability of autonomous wind–diesel systems are discussed with emphasis on the eigenvalue analysis and the effective parameters on system stability. In this regards, saddle node bifurcation and hopf bifurcation are also investigated.
Volume: 1
Issue: 2
Page: 47-64
Publish at: 2012-08-01

Transmission Loss Allocation Based on Lines Current Flow

10.11591/ijape.v1.i2.pp65-74
Rahmat Aazami , Ali mansori , NosratAllah Mohammad Baigi , Amin Omidian , Ehsan Mohammadian
In this paper, the transmission loss allocation problem has been studied and a new method for loss allocation in pool electricity markets has been proposed. To do that, at first using a transmission line loss equations respect to bus injected currents, the share of each bus from the mentioned transmission line losses has been determined. Then, this method has been applied to the total network transmission lines and the share of each bus from the total losses has been acquired. The proposed method is based on the main network relations and no any simplifying suppose has been used. Finally, the proposed method is studied on a typical network.
Volume: 1
Issue: 2
Page: 65-74
Publish at: 2012-08-01

Automatic Generation Control for Interconnected Hydro-thermal System with the help of Conventional Controllers

https://ijece.iaescore.com/index.php/IJECE/article/view/5362
Vikram Kumar Kamboj , Krishan Arora , Preeti Khurana
The Problem of Automatic Generation Control of large interconnected multi-area system is necessitated by the importance of maintenance of frequency and tie-line flows at their scheduled values. Disturbance in any part of the power system network has its effect on the frequency and tie-line power flows of the entire network. Thus, It is the responsibility of the Power system engineers to ensure that adequate power is delivered to the load reliably and economically so that nominal condition will be re-established. This Research paper aims to represents how nominal value can be achieved by close loop control of real and reactive powers generated in the controllable source of the system with the help of conventional controllers.DOI:http://dx.doi.org/10.11591/ijece.v2i4.305
Volume: 2
Issue: 4
Page: 547-552
Publish at: 2012-08-01

Technical and Economic Assessment for using Ground-Source Heat Pumps in Commercial and Institutional Buildings

https://ijece.iaescore.com/index.php/IJECE/article/view/5357
Hossein Shahinzadeh , Hajar Ghotb
One of the most important methods proposed for reduction of consumed energy in facility and ventilation systems in a building is application of ground source heat pumps (GSHPs). With regard to the enhanced use of such pumps in providing heat and cold demands in homes, commercial centers, institutions and industrial buildings analysis of their performance as well as their benefits and deficiencies compared to common ventilation systems have gained interest of many researchers. Such systems apply ground as a thermal well in summer and as a heat source in winter. They can be used in various climatic conditions in different regions. They have no combustion and they only transfer heat. In the present article first, performance conditions of ground source heat pumps (in two modes of heating and cooling) are analyzed. Then in order to assess the performance of proposed model economically, its application in Iran will be studied. Finally after introducing the proposed plan and by concluding the overall results the return time for investment will be estimated. The obtained results from graph analysis would indicate the superiority of proposed model over other plans and also it provides an appropriate general context for the researchers for a better understanding and examining this system in comparison to other systems.DOI:http://dx.doi.org/10.11591/ijece.v2i4.1463
Volume: 2
Issue: 4
Page: 502-510
Publish at: 2012-08-01

Battery Control Strategy for Hybrid Power Generation Systems

https://ijece.iaescore.com/index.php/IJECE/article/view/5351
Junaidi Junaidi , Ayong Hiendro , Yohannes M. Simanjuntak
Standalone diesel generators (DGs) are widely utilized in remote areas in Indonesia. Some areas use microhydro (MH) systems with DGs backup.  However, highly diesel fuel price makes such systems become uneconomical. This paper introduces hybrid photovoltaic (PV)/MH/ DG/battery systems with a variable charging strategy method to minimize the diesel fuel consumption. The method is applied to control the state of charge (SOC) level of the battery based on its previous level and the demand load condition to optimize the DG operation. The optimal operation shows that the hybrid PV/MH/DG/battery with the variable charging strategy needs less fuel consumption than PV/MH/DG and MH/DG systems.DOI:http://dx.doi.org/10.11591/ijece.v2i4.556 
Volume: 2
Issue: 4
Page: 456-462
Publish at: 2012-08-01

Design and Development of a Litho-code ID based electronic entry-control system

https://ijece.iaescore.com/index.php/IJECE/article/view/5361
Umma Hany , Forhad Ebn Anwar , Nadiya Mahjabin , Sheesh Islam , Farzana Alam
Different card operated entry control systems have been developed. However, it is desired that the system is reliable, easy to implement and available at market. In this paper, we design and develop an electronic entry control system which is based on an ID card and ID card reader. In our system, the ID card contains encoded Litho-code ID and the card reader is used to read the encoded ID. We develop offline Software to collect user information, save data and to print the ID card. We design and develop the electronic card reader to capture the ID using infra-red (IR) sensors and for computer interfacing. We develop online software to process the signals exchanged between the card reader and CPU. In this paper, first we present the system layout and design outline. Then we explain the development and implementation methodology. Finally, we test the system and present the results.DOI:http://dx.doi.org/10.11591/ijece.v2i4.705
Volume: 2
Issue: 4
Page: 537-546
Publish at: 2012-08-01

A Protoype System for Transmitting Power through Radio Frequency Signal for Powering Handheld Devices

https://ijece.iaescore.com/index.php/IJECE/article/view/5356
Olakanmi O.Oladayo
Miniature devices development has been greatly complementing the technology developmental trend in telecommunication. This makes the new communication technology to sail smoothly into the society and creating unexpected market for both the telecommunication providers and embedded system manufactures. However power has been the major problem in the usage of some of these devices most especially in third world countries where power is epileptically supplied. This paper proposes a prototype system which wirelessly generates DC for charging and powering power-critical handheld and remotely located devices. The design captures 900MHz radio frequency signal with a dipole antenna, which is converted into DC and stores the power in the device’s battery or use it to power it. The major aim of this paper is to provide a prototypical system which provides a cheap, constant and environmental friendly system for powering and charging power critical handheld and remote devices thereby prevents systems failure due to power loss.DOI:http://dx.doi.org/10.11591/ijece.v2i4.572
Volume: 2
Issue: 4
Page: 495-501
Publish at: 2012-08-01
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