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25,002 Article Results

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

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

Dual Proportional Integral Controller of Two-Area Load Frequency Control Based Gravitational Search Algorithm

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1512
M. Elsisi , M. Soliman , M. A. S. Aboelela , W. Mansour
Gravitational Search Algorithm (GSA) has recently been explored to develop a novel algorithm for distributed optimization and control. This paper proposes a dual Proportional Integral (PI) controller of Load Frequency Control (LFC) based GSA to enhance the damping of oscillations in a two-area power system. A two-area non-reheat thermal system is considered to be equipped with dual PI controller. GSA is utilized to search for optimal controller parameters by minimizing a time-domain based objective function. The performance of the proposed controller has been evaluated with the performance of the conventional PI controller, and  PI  controller  tuned  by  GSA in  order  to  demonstrate  the  superior efficiency of the proposed dual PI controller tuned by GSA. Simulation results emphasis on the better performance of the optimized dual PI controller based on GSA in compare to optimized PI controller based on GSA and conventional one over wide range of operating conditions, and system parameters variations. DOI: http://dx.doi.org/10.11591/telkomnika.v15i1.8093
Volume: 15
Issue: 1
Page: 26-35
Publish at: 2015-07-01

Platform-as-a-Service (PaaS): Model and Security Issues

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1526
Devi T , Ganesan R
Cloud computing is making a big revolution in the field of information technology thereby reducing capital expenditures spent. Computing is delivered as a service enabling effective utilization of computational resources. Certain security issues exist which prevents individuals and industries from using clouds despite its advantages. Resolving such problems may increase the usage of cloud thereby reducing the amount spent for resources. The paper focuses on one of the three service delivery models, Platform-as-a-Service (PaaS). PaaS model, layers in PaaS and PaaS providers are described along with the security issues encountered in PaaS clouds. The issues along with solutions discussed provide an insight into PaaS security for both providers and users which may help in future PaaS design and implementation. DOI: http://dx.doi.org/10.11591/telkomnika.v15i1.8073 
Volume: 15
Issue: 1
Page: 151-161
Publish at: 2015-07-01

Power Flow and Transient Stability Improvement by Static Synchronous Series Compensator

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1517
Md. Imran Azim , Md. Abdul Wahed , Md. Ahsanul Haque Chowdhury
In the present world, modern power system networks, being a complicated combination of generators, transmission lines, transformers, circuit breakers and other devices, are more vulnerable to various types of faults causing stability problems. Among these faults, transient fault is believed to be a major disturbance as it causes large damage to a sound system within a certain period of time. Therefore, the protection against transient faults, better known as transient stability control, is one of the major considerations for the power system engineers. This paper presents the control approach in the transmission line during transient faults by means of Static Synchronous Series Compensator (SSSC) in order to stabilize Single Machine Infinite Bus (SMIB) system.  In this paper, SSSC is represented by variable voltage injection associated with the transformer leakage reactance and the voltage source. The comparative results depict that the swing curve of a system increases monotonically after the occurrence of transient faults However, SSSC is effective enough to make it stable after a while. DOI: http://dx.doi.org/10.11591/telkomnika.v15i1.8075
Volume: 15
Issue: 1
Page: 71-77
Publish at: 2015-07-01

A Nine Level Cascaded Multi Level Inveter Using Embedded and FlipFlops

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1515
Chinnapettai Ramalingam Balamurugan , S.P. Natarajan , T.S. Anandhi , B. Shanthi
This paper proposes a nine level cascaded multilevel inverter based on the flip flops and logic gates. Generally multilevel inverter is used to achieve the high power by using a series of power semiconductor switches with the several dc voltage sources which is used to perform the power conversion. In this paper the flip flop based CMLI is compared with the conventional CMLI. The flip flops and logic gates are used to create logic equation for the each switch of the CMLI by using the switching states. This proposed topology is mainly used to reduce the total harmonic distortion and also increase the performance of the system. DOI: http://dx.doi.org/10.11591/telkomnika.v15i1.7978
Volume: 15
Issue: 1
Page: 57-62
Publish at: 2015-07-01

LEDs Lighting Arrangements for Underground Mines

https://ijeecs.iaescore.com/index.php/IJEECS/article/view/1510
Pratap Singh Yadav , Nitai Pal , Dheeraj Kumar , S. Vamsi Krishna
Lighting condition is very critical to mine workers, since they completely depend upon visual indication. Effective lighting systems provide better visibility and contribute to improved safety, production, productivity and efficiency of equipments. This paper intended to present a simulation study of configurations for the uniform illumination over a rectangular-target surface (underground mine 26X4.8 m gallery) using power LEDs. This cost effective lighting involved different sets of arrangements of LEDs that provide a close uniform light level for given optimized parameters. The optimized values of the variables in the arrangements were obtained by the using of MATLAB functions for optimization toolbox. DOI: http://dx.doi.org/10.11591/telkomnika.v15i1.7969 
Volume: 15
Issue: 1
Page: 14-19
Publish at: 2015-07-01
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