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Journal receives papers in continuous flow and we will consider articles from a wide range of Information Technology disciplines encompassing the most basic research to the most innovative technologies. Please submit your papers electronically to our submission system at http://jatit.org/submit_paper.php in an MSWord, Pdf or compatible format so that they may be evaluated for publication in the upcoming issue. This journal uses a blinded review process; please remember to include all your personal identifiable information in the manuscript before submitting it for review, we will edit the necessary information at our side. Submissions to JATIT should be full research / review papers (properly indicated below main title).

Journal of Theoretical and Applied Information Technology August 2011 | Vol. 30 No.1

Paper ID:	14222 -JATIT
Title:	GA SPEED AND DQ CURRNETS CONTROL OF PMSM WITH VECTOR CONTROL BASED SPACE VECTOR MODULATION USING MATLAB/SIMULINK
Author:	A. El Janati El Idrissi, N. Zahid
Source:	Journal of Theoretical and Applied Information Technology pp 01-09 Vol 30. No. 1 -- 2011
Abstract	In recent years, permanent magnet synchronous motors (PMSM) have gained variety industrial applications, because of simple structures, high efficiency and ease of maintenance. But these motors have a nonlinear mathematical model. To resolve this problem several studies have suggested the application of soft-computing technique. This paper presents vector control of PMSM fed by space vector modulation inverter using genetic algorithm (GA) controllers to improve speed, currents and the electric torque by significantly reducing their ripples, which offer an extra advantage of this study. The proposed method effectiveness has been verified by computer simulations using Matlab/Simulink®. These results are compared with the ones obtained with a vector control using PI controllers for speed and current [1] and the second obtained with adaptive controller based speed estimation technique [2].
Keywords	Permanent Magnet Synchronous Motor (PMSM), Vector Control, Space Vector Modulation (SVM), Genetic Algorithm (GA)
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Paper ID:	14176 -JATIT
Title:	COMPARISON PERFORMANCE OF INDUCTION MOTOR USING SVPWM AND HYSTERESIS CURRENT CONTROLLER
Author:	FIZATUL AINI PATAKOR, MARIZAN SULAIMAN, ZULKIFILIE IBRAHIM
Source:	Journal of Theoretical and Applied Information Technology pp 10-17 Vol 30. No. 1 -- 2011
Abstract	This paper presents the comparative performances of three phase induction motors using space vector pulse width modulation (SVPWM) and hysteresis current controller. An indirect field orientation is applied to ensure decoupling control between torque and flux of the induction motor. The hysteresis current controller is built in with PI speed controller and three hysteresis current bands while the SVPWM system is embedded with the two control loops, the inner current control loop and the outer speed control loop using PI controller. Both systems were run and tested using MATLAB/SIMULINK software. The simulation results demonstrate that the SVPWM can improve the quality of the stator current and reduce the torque ripple while maintaining the other performance characteristics of the system.
Keywords	Indirect Field Oriented, Space Vector Pulse Width Modulation (SVPWM), Hysteresis Current Controller
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Paper ID:	14326 -JATIT
Title:	A METHOD FOR QUALITY POWER PROVIDER TO OPERATE IN DISTORTED SUPPLY CONDITION
Author:	K.CHANDRASEKARAN, K.S.RAMA RAO
Source:	Journal of Theoretical and Applied Information Technology pp 18-27 Vol 30. No. 1 -- 2011
Abstract	Power Quality is a major concern within power industry and consumers. Poor quality of supply will affect the performance of customer equipment such as computers, microprocessors, adjustable speed drives, power electronic controllers, life saving equipment in hospitals, etc. and result in heavy financial losses to customers due to loss of production or breakdown in industries or loss of life in a hospital. The two major power quality disturbances are voltage sag and harmonic distortion. In this paper, a Quality Power Provider (QPP) based on voltage source inverter is modeled by simulation to compensate the power quality disturbances such as voltage sag and voltage harmonics in the distorted supply condition. The phase locked loop (PLL) is an important control unit of the QPP control scheme. To obtain accurate phase information and frequency of the input supply, the dqPLL method has been proposed. Simulation results based on MATLAB and PSCAD software are presented to verify the performance of the proposed QPP. QPP has improved the quality of power supply at the sensitive load end.
Keywords	Voltage Sag, Harmonics, PLL, Dqpll, Double Frequency Component
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Paper ID:	14266 -JATIT
Title:	OPTIMAL CAPACITORS PLACEMENT IN DISTRIBUTION NETWORKS USING GENETIC ALGORITHM: A DIMENSION REDUCING APPROACH
Author:	S.NEELIMA, Dr. P.S.SUBRAMANYAM
Source:	Journal of Theoretical and Applied Information Technology pp 28-34 Vol 30. No. 1 -- 2011
Abstract	A distribution system is an interface between the bulk power system and the consumers. Among these systems, radial distributions system is popular because of low cost and simple design. In distribution systems, the voltages at buses reduces when moved away from the substation, also the losses are high. The reason for decrease in voltage and high losses is the insufficient amount of reactive power, which can be provided by the shunt capacitors. But the placement of the capacitor with appropriate size is always a challenge. Thus the optimal capacitor placement problem is to determine the location and size of capacitors to be placed in distribution networks in an efficient way to reduce the power losses and improve the voltage profile of the system. For this purpose, in this paper, two stage methodologies are used. In first stage, the load flow of pre-compensated distribution system is carried out using ‘dimension reducing distribution load flow algorithm (DRDLFA)’. On the basis of this load flow the potential locations of compensation are computed. In the second stage, Genetic Algorithm (GA) technique is used to determine the optimal location and size of the capacitors such that the cost of the energy loss and capacitor cost to be a minimum. The above method is tested on IEEE 69 bus system and compared with other methods in the literature.
Keywords	Dimension Reducing Distribution Load Flow Algorithm (DRDLFA)’ Genetic Algorithm, Electrical Distribution Network, Optimal Capacitors Placement.
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Paper ID:	14289 -JATIT
Title:	GENETIC ALGORITHM FOR DECODING LINEAR CODES OVER AWGN AND FADING CHANNELS
Author:	H. BERBIA, F. ELBOUANANI, R. ROMADI, H. BENAZZA, M. BELKASMI
Source:	Journal of Theoretical and Applied Information Technology pp 35-41 Vol 30. No. 1 -- 2011
Abstract	This paper introduces a decoder for binary linear codes based on Genetic Algorithm (GA) over the Gaussian and Rayleigh flat fading channel. The performances and compututional complexity of our decoder applied to BCH and convolutional codes are good compared to Chase-2 and Viterbi algorithm respectively. It show that our algorithm is less complex for linear block codes of large block length; furthermore it's performances can be improved by tuning the decoder's parameters, in particular the number of individuals by population and the number of generations
Keywords	Block Code, Decoding, Methaheuristic, Genetic Algorithm, Neural Network
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Paper ID:	14304 -JATIT
Title:	RELIABILITY ANALYSIS OF RING, AGENT AND CLUSTER BASED DISTRIBUTED SYSTEMS
Author:	R.SEETHALAKSHMI, K.S.RAVICHANDRAN
Source:	Journal of Theoretical and Applied Information Technology pp 42-47 Vol 30. No. 1 -- 2011
Abstract	The introduction of pervasive devices and mobile devices has led to immense growth of real time distributed processing. In such context reliability of the computing environment is very important. Reliability is the probability that the devices, links, processes, programs and files work efficiently for the specified period of time and in the specified condition. Distributed systems are available as conventional ring networks, clusters and agent based systems. Reliability of such systems is focused. These networks are heterogeneous and scalable in nature. There are several factors, which are to be considered for reliability estimation. These include the application related factors like algorithms, data-set sizes, memory usage pattern, input-output, communication patterns, task granularity and load-balancing. It also includes the hardware related factors like processor architecture, memory hierarchy, input-output configuration and network. The software related factors concerning reliability are operating systems, compiler, communication protocols, libraries and preprocessor performance. In estimating the reliability of a system, the performance estimation is an important aspect. Reliability analysis is approached using probability.
Keywords	Reliability, Distributed System, Clusters, Agents, Ring Networks Cluster Information Gathering.
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Paper ID:	14367 -JATIT
Title:	SEARCHABLE SYMMETRIC ENCRYPTION: REVIEW AND EVALUATION
Author:	YAP JOE EARN, RAED ALSAQOUR, MAHA ABDELHAQ, TARIQ ABDULLAH
Source:	Journal of Theoretical and Applied Information Technology pp 48-54 Vol 30. No. 1 -- 2011
Abstract	Searchable Symmetric Encryption (SSE) allows a user to search over their encrypted data on a third party storage provider privately. There are several existing SSE schemes have been proposed to achieve this goal. This paper concerns with three currentSSE schemes, which are the Practical Techniques for Searches in Encrypted Data (PTSED), the Secure Index(SI), and the Fuzzy Keyword Search over Encrypted Data in the Cloud Computing (FKS-EDCC).The objective of this paper is to introduce a review of the three schemes with a discussion in the advantages and disadvantages of each.This paper also implements aprototype over an SI-based secure file searching system using java language. The performance of the system has been evaluated and discussed according to the false-positive rate.
Keywords	Searchable Symmetric Encryption (SSE), Practical Techniques for searches in encrypted Data (PTSED), Secure index (SI), Fuzz Keyword Search over Encrypted Data in Cloud Computing (FKS-EDCC)
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Paper ID:	14316 -JATIT
Title:	SURVEY ON SURVIVAL APPROACHES IN WIRELESS NETWORK AGAINST JAMMING ATTACK
Author:	FARAZ AHSAN, ALI ZAHIR, SAJJAD MOHSIN, KHALID HUSSAIN
Source:	Journal of Theoretical and Applied Information Technology pp 55-65 Vol 30. No. 1 -- 2011
Abstract	Wireless networks are more depicted to intentional or unintentional threats than their wired based equivalent networks. Major reason being the wireless medium which can be approached by others, who can listen and interfere in an on-going valid communication. In the absence of a collision detection mechanism and relying mainly on cooperation of each other for packet routing, the standard defined for wireless network is unable to identify any malicious activity, by default. Among attacks the ones which create isolation of the nodes on the network are considered more severe. If they last long enough, can result in denial-of-service and hence network collapses completely. The simplest form of such attacks is jamming attack which can block any current legitimate communication. It is easy to launch as no especial hardware is required and the area in range for a particular time can be jammed for any legal communication. Jamming is a specialized Denial of Service attack in which purpose is not to overflow buffers, instead to choke the physical communication channel, hence avoiding jammer is much harder than other forms of denial of service attacks. Unlike other attacks, especially routing attacks, no network parameter and topology etc need to be known in advance before launching jamming attack. However, if the network parameters are known and the attack is intelligently placed, a jammer can last longer resulting in more survival time on the network and damage. This paper surveys on different types of jamming attack and the mitigation techniques generally used. Besides this, we investigate about the approaches proposed that are considered efficient to survive in a jammed region, actively. Finally, we conclude by highlighting the potential areas which can be targeted to optimize in minimizing the effects of a jamming attack, as future directions.
Keywords	WLAN, Jamming Attack, Wireless Network, Survival Approaches, DOS
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