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27,404 Article Results

Design, Testing Analysis of High Tension Increased Safety Motor for Hazardous areas

10.11591/ijeecs.v15.i2.pp237-248
Bhagirath Ahirwal , Tarun Kumar Chatterjee
The increased safety (Ex e) motors are designed for safe operation in the zone 1 and 2 hazardous areas. The present paper describes the significant design parameters and successful testing of Ex e high tension (HT) induction motor rated 970KW/6.6KV/18 pole/ 3Phase/ 50Hz as per IS/IEC 60079-7 standard. The comparison of some useful design parameters is also given between safe area motor and hazardous area motor in this paper. The Ex e high tension induction motor mentioned in this paper have been manufactured by Bharat Heavy Electricals Ltd. (BHEL), Bhopal, India during the project and main author was the project leader.
Volume: 15
Issue: 2
Page: 237-248
Publish at: 2015-08-01

Mitigating the Effects of Intereference in a Multipath Prone Environment for a DVB-T Transmission

10.11591/ijict.v4i2.pp86-89
Oluwaseun Yinka Alabi , Michael Kolawole
This paper develops a novel simulation method that seeks to mitigate the effects of interference in a multipath prone environment for a DVB-T transmission by using the AWGN and the Multipath Rayleigh Fading Channel. The channel parameters were optimized until desired result was obtained. The reception performance of the DVB-T system shows that interference though not totally eliminated, can be minimized while transmitting in a multipath prone environment.
Volume: 4
Issue: 2
Page: 86-89
Publish at: 2015-08-01

Recognition of a Face in a Mixed Document

10.11591/ijeecs.v15.i2.pp301-312
Lhoussaine Bouhou , Rachid El Ayachi , Mohamed Fakir , Mohamed Oukessou
Face recognition is the field of great interest in the domaine of research for several applications such as biometry identification, surveillance, and human-machine interaction…This paper exposes a system of face recognition. This system exploits an image document text embedding a color human face image. Initially, the system, in its phase of extraction, exploitis the horizontal and vertical histogram of the document, detects the image which contains the human face. The second task of the system consists of detecting the included face in other to determine, with the help of invariants moments, the characteristics of the face. The third and last task of the system is to determine, via the same invariants moments, the characteristics of each face stored in a database in order to compare them by means of a classification tool (Neural Networks and K nearest neighbors) with the one determined in the second task for the purpose of taking the decision of identification in that database, of the most similar face to the one detected in the input image.
Volume: 15
Issue: 2
Page: 301-312
Publish at: 2015-08-01

Modeling of Balanced and Unbalanced Three-Phase Induction Motor under Balanced and Unbalanced Supply Based on Winding Function Method

10.11591/ijece.v5i4.pp644-655
Mohammad Jannati , Tole Sutikno , Nik Rumzi Nik Idris , Mohd Junaidi Abdul Aziz
An accurate model of balanced and unbalanced three-phase Induction Motor (IM) under balanced and unbalanced supply conditions based on Winding Function Method (WFM) is presented in this work. In this paper, the unbalanced condition in three-phase IM is limited to stator winding open-phase fault. The analysis of presented models is shown in details which allow predicting the performance of 3-phase IM under different conditions. Computer simulations were obtained using the MATLAB software for a three-phase squirrel cage IM. MATLAB simulation results show that the oscillation of the speed and electromagnetic torque has increased considerably due to the open-phase fault in stator windings.
Volume: 5
Issue: 4
Page: 644-655
Publish at: 2015-08-01

A Comparative Study: Change Detection and Querying Dynamic XML Documents

10.11591/ijece.v5i4.pp840-848
Vijay R Sonawane , D.R. Rao
The efficient management of the dynamic XML documents is a complex area of research. The changes and size of the XML documents throughout its lifetime are limitless. Change detection is an important part of version management to identify difference between successive versions of a document. Document content is continuously evolving. Users wanted to be able to query previous versions, query changes in documents, as well as to retrieve a particular document version efficiently. In this paper we provide comprehensive comparative analysis of various control schemes for change detection and querying dynamic XML documents.
Volume: 5
Issue: 4
Page: 840-848
Publish at: 2015-08-01

Decoupled Feed Forward Voltage Oriented Controller For DFIG Under Balanced And Unbalanced Fault Conditions

10.11591/ijeecs.v15.i2.pp209-216
Dileep Kumar Varma , Y. P. Obulesh , Ch. Sai Babu
As wind power penetration increases continuously in total Power Generation, the wind turbines are necessary to stay connected to grid even under grid disturbances. An enhanced control strategy for DFIG is proposed in the present paper to meet the latest grid codes set by grid operators. The decoupled current controller implemented in grid voltage oriented reference frame is applied to Grid Side Converter (GSC) to improve the dynamic performance of DFIG. The proposed scheme enhances the Low Voltage ride through capability of Wind farm by providing reactive Power support under adverse grid conditions. The Proposed scheme also counteracts the ripples in DC Link voltage, stator/rotor currents and stator/reactive power to fulfill the grid code commitments in weak grid.Simulation results are presented to verify the feasibility and robustness of the proposed control scheme.
Volume: 15
Issue: 2
Page: 209-216
Publish at: 2015-08-01

Aircraft Control System Using Model Predictive Controller

10.11591/ijeecs.v15.i2.pp259-269
Labane Chrif , Zemalache Meguenni Kadda
This paper concerns the application of model-based predictive control to the longitudinal and lateral mode of an aircraft in a terrain following task. The predictive control approach was based on a quadratic cost function and a linear state space prediction model with input and state constraints. The optimal control was obtained as the solution of a quadratic programming problem defined over a receding horizon. Closed-loop simulations were carried out by using the linear aircraft model. This project thesis provides a brief overview of Model Predictive Control (MPC).A brief history of industrial model predictive control technology has been presented first followed by a some concepts like the receding horizon, moves etc. which form the basis of the MPC. It follows the Optimization problem which ultimately leads to the description of the Dynamic Matrix Control (DMC).The MPC presented in this report is based on DMC. After this the application summary and the limitations of the existing technology has been discussed and the next generation MPC, with an emphasis on potential business and research opportunities has been reviewed. Finally in the last part we generate Matlab code to implement basic model predictive controller and introduce noise into the model.
Volume: 15
Issue: 2
Page: 259-269
Publish at: 2015-08-01

Processor Speed Control for Power Reduction of Real-Time Systems

10.11591/ijece.v5i4.pp701-713
Medhat Awadalla
Reducing energy consumption is a critical issue in the design of battery-powered real time systems to prolong battery life. With dynamic voltage scaling (DVS) processors, energy consumption can be reduced efficiently by making appropriate decisions on the processor speed/voltage during the scheduling of real time tasks. Scheduling decision is usually based on parameters which are assumed to be crisp. However, in many circumstances the values of these parameters are vague. The vagueness of parameters suggests that to develop a fuzzy logic approach to reduce energy consumption by determining the appropriate supply-voltage/speed of the processor provided that timing constraints are guaranteed. Intensive simulated experiments and qualitative comparisons with the most related literature have been conducted in the context of dependent real-time tasks. Experimental results have shown that the proposed fuzzy scheduler saves more energy and creates feasible schedules for real time tasks. It also considers tasks priorities which cause higher system utilization and lower deadline miss time.
Volume: 5
Issue: 4
Page: 701-713
Publish at: 2015-08-01

Control Analysis of Stand-Alone Wind Power Supply System with Three Phase PWM Voltage Source Inverter and Boost Converter

10.11591/ijece.v5i4.pp798-809
Tin Zar Khaing , Lwin Za Kyin
Wind power supply system is an effective, environmentally friendly power source for household and other applications. According to the wind speed changes in variation the output power of wind generator is not stable and constant. This paper proposes the variable speed stand-alone wind power supply system that includes Permanent Magnet Synchronous Generator, three phase diode rectifier, DC-DC boost converter, battery energy storage system, and voltage source inverter. DC-DC boost converter controls to extract maximum power from the available wind power. Battery energy storage system through bidirectional converter is to supply the load when wind power is shortage. To get the desired output voltage and frequency at the load side, the voltage source inverter with the sinusoidal pulse width modulation (SPWM) control technique has chosen. The harmonics generated from the VSI are filtered with simple passive LC filters.  Simulation results of output voltages and currents, the total harmonic distortion (THD) are presented using MATLAB/Simulink.
Volume: 5
Issue: 4
Page: 798-809
Publish at: 2015-08-01

Heuristic Approaches to Solve Traveling Salesman Problem

10.11591/ijeecs.v15.i2.pp390-396
Malik Muneeb Abid , Iqbal Muhammad
This paper provides the survey of the heuristics solution approaches for the traveling salesman problem (TSP). TSP is easy to understand, however, it is very difficult to solve. Due to complexity involved with exact solution approaches it is hard to solve TSP within feasible time. That’s why different heuristics are generally applied to solve TSP. Heuristics to solve TSP are presented here with detailed algorithms. At the end, comparison among selected approaches shows the efficiency of approaches in terms of solution quality and time consumed to solve TSP.
Volume: 15
Issue: 2
Page: 390-396
Publish at: 2015-08-01

Analysis Air Cooling Mechanism for Photovoltaic Panel by Solar Simulator

10.11591/ijece.v5i4.pp636-643
Mohd. Irwan Yusoff , Leow Wai Zhe , Muhammad Irwanto Misrun , Mohd Fareq Abd. Malek , Amelia Abdul Razak , Gomesh Nair A/L Shasidharan , Safwati Ibrahim
Measurement the outdoor efficiency of photovoltaic (PV) panels is essential, but it is not likely an exceptional circumstance at any given moment is always repeating itself. A solar simulator was designed and fabricated for the purpose of analyzing the performance of PV panel with and without an air cooling mechanism in indoor test. Twenty units of 500 W halogen lamps with build-in reflector support by the steel structure holder act as a natural sunlight. The uniformity of the solar radiation was measured in the test area. Two units of PV panel with same characteristics were experimental in three sets of uniformity of solar radiation, which are 620, 821 and 1016 W/m². The operating temperature of PV panel with an air cooling mechanism can be decreased 2-3 ˚C compared to PV panel reference. The PV panel with an air cooling mechanism can be increased in 3-7 % of maximum power output based on solar radiation. An overall method and procedure of the measurement by the solar simulator are discussed and proposed.
Volume: 5
Issue: 4
Page: 636-643
Publish at: 2015-08-01

Detection of Kidney Organ Condition Using Hidden Markov Models

10.11591/ijeecs.v15.i2.pp294-300
Siska Anraeni , Ingrid Nurtanio , Indrabayu Indrabayu
The frequencies of chronic kidney disease are likely to continue to increase worldwide. So people need to take a precaution, which is by maintaining kidney health and early detection of renal impairment by analyzing the composition of the iris is known as iridology. This paper presents a novel approach using a one-dimensional discrete Hidden Markov Model (HMM) classifier and coefficients Singular Value Decomposition (SVD) as a feature for image recognition iris to indicate normal or abnormal kidney. The system has been examined on 200 iris images. The total images of the abnormal kidney condition were 100 images and those for the normal kidney condition were 100 images. The system showed a classification rate up to 100% using total of image for training and testing the system unspecified, resize iris image 56x46 pixels, coefficient values U(1,1), Σ(1,1) and Σ(2,2), quantized values [18 10 7], and classify by 7-state HMM with .pgm format database.
Volume: 15
Issue: 2
Page: 294-300
Publish at: 2015-08-01

One-Bit Hard Combination Decision Scheme for Cooperative Spectrum Sensing in Cognitive Radio

10.11591/ijict.v4i2.pp66-73
Md. Shamim Hossain , Md. Ibrahim Abdullah , Mohammad Alamgir Hossain
In this paper, the performance of 1-bit hard combination decision scheme for cooperative spectrum sensing in Cognitive Radio has been studied to maximize the probability of primary user detection. Energy detector model is used to observe the presence of primary user signal. Simulation result shows that the probability of missed detection is decreasing for both conventional and 1-bit hard combination OR rule with increasing the probability of false alarm correspondingly. It also has demonstrated that 1-bit hard combination decision scheme exhibits comparable performance with the conventional one-bit scheme and thus achieves a good tradeoff between performance and complexity.
Volume: 4
Issue: 2
Page: 66-73
Publish at: 2015-08-01

Metal Mountable Ladder Feed Line UHF-RFID Tag Antenna

10.11591/ijece.v5i4.pp750-758
Najwa Mohd Faudzi , Mohd Tarmizi Ali , Ismarani Ismail , Hadi Jumaat , Nur Hidayah Mohd Sukaimi
A microstrip dipole UHF-RFID tag antenna that can be mounted on metal object is presented in this paper. The antenna, which has a very simple structure without any shorting pin and shorting plate, is composed of ladder feed line, rectangular loop, capacitive tip-loading and T-match structure. The insertion of ground plane in the tag antenna design reduces the negative impact of metal object to the performance of the tag antenna. The tag is designed to operate in the Malaysia frequency range with the center frequency of 921 MHz. The performance of the tag is evaluated through simulation and measurement in terms of impedance matching, antenna reflection coefficient and tag reading range. The measured reading range obtained when the tag is in free air and on metal object is 2.3 m and 2.2 m respectively.
Volume: 5
Issue: 4
Page: 750-758
Publish at: 2015-08-01

Smart Grid and Computer Network: How Analogous Are They?

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1529
Khalid Lefrouni , Rachid Ellaia
Technological advances allowing optimal exploitation of renewable energy sources and the development of new information and communications technology (ICT), have led to the appearance of a new network so-called Smart Grid. This article is dedicated to the study of similarities and differences between the smart grid and the computer network, thus, in order to better carry out this comparison. Firstly, we present the structure, operational model and benefits of smart grid. Secondly, we identify analogous quantities and similar parameters between the two networks. DOI: http://dx.doi.org/10.11591/telkomnika.v15i1.8087 
Volume: 15
Issue: 1
Page: 177-183
Publish at: 2015-07-01
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