Journal of Theoretical and Applied Information Technology (JATIT)- Volume 19 No 2

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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 September 2010 | Vol. 19. No.2

Paper ID:	1296 -JATIT-2K10
Title:	RETRIEVING USE CASE DIAGRAM WITH CASE-BASED REASONING APPROACH
Author:	B. SRISURA, Dr. J. DAENGDEJ
Source:	Journal of Theoretical and Applied Information Technology Vol 19. No. 2 -- 2010
Abstract	Due to the difficulty of recalling the semi-structure form of use case diagram, applying reusing approach to the requirement analysis process has been being concerned as a complex task. Despite of this fact, there are relatively little attentions found in the research community. Therefore, this paper proposes how Case-Based Reasoning (CBR) – an approach solves new problem from recalling experiences, can be effectively applied to support the use case diagram reuse. In this research, the diagram retrieval method is designed to match the use case diagram by considering two dimensions: use case and actor dimension and relationship dimension. However, in order to present the significant accuracy and practicality of the proposed method, a tool and five comparative sets– including four various dimensional weights and one commercial tool were carefully set up to test in an experiment.
Keywords	Diagram-Based Retrieval, Use Case Diagram Retrieval, Use case Reuse
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Paper ID:	1425 -JATIT-2K10
Title:	ON ENERGY EFFICIENT DATA DISSEMINATION IN WIRELESS SENSOR NETWORKS USING MOBILE SINKS
Author:	NATARAJAN MEGHANATHAN, SUGAM K. SHARMA, GORDON W. SKELTON
Source:	Journal of Theoretical and Applied Information Technology Vol 19. No. 2 -- 2010
Abstract	We illustrate the effectiveness of using mobile sinks to obtain potential energy savings for the sensors during data dissemination in wireless sensor networks. The entire wireless sensor network is divided into two layers: the resource-constrained sensor nodes forming the bottom layer and a mobile ad hoc network of resource-rich sink nodes forming the top layer. Each sink node is assigned a particular cluster of sensors to monitor and collect data. A sink node moves to the vicinity of the sensor nodes (within a few hops) to collect data. The collected data is exchanged with peer mobile sinks and can also be transferred to a control center through multi-hop sink-to-sink data propagation. The energy loss due to multi-hop data propagation in disseminating the data from a sensor to the control center can be accounted to the sinks and not to the sensors. We also illustrate the effectiveness of using just one mobile sink to reduce energy consumption at the sensors in scenarios where one cannot afford to use multiple mobile sinks. In such scenarios, the mobile sink directly transfers the collected data to the control center.
Keywords	Energy Consumption, Mobility, Sensor Networks, Two-layer Architecture, Simulation, Mobile Sinks
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Paper ID:	1434-JATIT-2K10
Title:	COMPARITIVE STUDY ON VOLTAGE SAG COMPENSATION UTILIZING PWM SWITCHED AUTOTRANSFORMER BY HVC
Author:	T. DEVARAJU, DR.M.VIJAYA KUMAR , DR.V.C.VEERA REDDY
Source:	Journal of Theoretical and Applied Information Technology Vol 19. No. 2 -- 2010
Abstract	Custom Power devices like Dynamic voltage restorer and STATCOM are normally employed as a solution for mitigation of power quality problems like voltage sag and swell. In this paper new voltage sag compensators based on an autotransformer and an IGBT switched by PWM technique and Hysteresis Voltage Control (HVC) method are compared. These two schemes are able to recognize the voltage sag condition quickly, and it can correct the correct the voltage by boosting the input voltage during voltage sag events. Different voltage sag events have been simulated by MATLAB/Simulink software. The results of simulations verify the ability of both methods to mitigate voltage sag events.
Keywords	DVR, STATCOM, PWM Switching, Hysterisis Voltage Control, Voltage Sag
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Paper ID:	1433-JATIT-2K10
Title:	DRY SLIDING WEAR BEHAVIOUR ANALYSIS OF NITRIDED 316LN GRADE AUSTENITIC STAINLESS STEELS USING GAS NITRIDING PROCESS
Author:	RAM.SUBBIAH, Dr.R.RAJAVEL
Source:	Journal of Theoretical and Applied Information Technology Vol 19. No. 2 -- 2010
Abstract	The paper presents the results of an investigation into wear behaviour of gas nitrided stainless steel. Stainless steel has a good corrosion resistance, where they possess a low hardness, wear resistance. By case hardening the stainless steel, the hardness can be increased. Surface hardness can be increased by diffusion of carbon or nascent nitrogen. The gas nitriding is done at 450 – 5400 C for three different specimens. Nitriding is done in which hard complex nitrides are formed which improves the surface hardness. Non treated austenitic stainless steel specimen was used as a reference material. Wear test were also carried out for comparision. The layers were characterized by optical microscope, scanning electron microscope and XRD. Wear test were conducted to characterize the tribological wear behaviour.
Keywords	Wear, Nitriding, Surface hardness, Stainless Steel, X-Ray diffraction
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Paper ID:	1435-JATIT-2K10
Title:	A NEURO FUZZY CONTROLLER FOR INDUCTION MACHINES DRIVES
Author:	SRINIVASA RAO JALLURI , Dr.B.V. SANKER RAM
Source:	Journal of Theoretical and Applied Information Technology Vol 19. No. 2 -- 2010
Abstract	With the advent of recent power semiconductor technologies and various intelligent control algorithms, an effective control method based on vector control technology can be fully implemented in real-time application. DC motor drives being the most widely used technique is slowly being replaced by vector-control based high-performance IM drives. Over the last two decades researchers have been working to apply AIC for induction motor drives in order to contribute to this novel development we present a neuro fuzzy controller (NFC) for the IM motor drive, which has the advantages of both FLC and ANN, is presented in this paper
Keywords	Nfc, Im Drives, Induction Motor (Im), Low/Zero-Speed Operation, Sensorless Control.
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Paper ID:	1295-JATIT-2K10
Title:	MULTI LAYER INFORMATION HIDING -A BLEND OF STEGANOGRAPHY AND VISUAL CRYPTOGRAPHY
Author:	JITHESH K , Dr. A V SENTHIL KUMAR
Source:	Journal of Theoretical and Applied Information Technology Vol 19. No. 2 -- 2010
Abstract	This study combines the notion of both steganography [1] and visual cryptography [2]. Recently, a number of innovative algorithms have been proposed in the fields of steganography and visual cryptography with the goals of improving security, reliability, and efficiency; because there will be always new kinds of threats in the field of information hiding. Actually Steganography and visual cryptography are two sides of a coin. Visual cryptography has the problem of revealing the existence of the hidden data where as Steganography hides the existence of hidden data. Here this study is to suggest multiple layers of encryption by hiding the hidden data. Hiding the hidden data means, first encrypting the information using visual cryptography and then hide the share/s[3] into images or audio files using steganography. The proposed system can be less of draw backs and can resist towards attacks.
Keywords	Stenography, Visual Cryptography, Share, Discrete Cosine Transform(DCT)
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Paper ID:	1446-JATIT-2K10
Title:	AN IMAGE ENCRYPTION APPROACH USING CHAOS AND STREAM CIPHER
Author:	ALIREZA JOLFAEI, 2ABDOLRASOUL MIRGHADRI
Source:	Journal of Theoretical and Applied Information Technology Vol 19. No. 2 -- 2010
Abstract	In this paper, a novel image encryption scheme is proposed based on combination of pixel shuffling and W7. Due to sensitivity to initial conditions, chaotic maps have a good potential for designing dynamic permutation map. So a chaotic Henon map is used to generate permutation matrix. An external secret key is used to derive the initial conditions for the chaotic map and W7 secret key. Pixel shuffling is performed via vertical and horizontal permutation. Shuffling is used to expand diffusion in the image and dissipate the high correlation among image pixels. In order to evaluate performance, the proposed algorithm was measured through a series of tests. Experimental results illustrate that the scheme is highly key sensitive and shows a good resistance against brute-force and statistical attacks.
Keywords	Shuffling, W7, Henon Map, Permutation Matrix, Test
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Paper ID:	1451 -JATIT-2K10
Title:	COMPETITIVE EQUILIBRIUM APPROACH FOR LOAD BALANCING A COMPUTATIONAL GRID WITH COMMUNICATION DELAYS
Author:	K SHAHU CHATRAPATI, J UJWALA REKHA, DR. A. VINAYA BABU
Source:	Journal of Theoretical and Applied Information Technology Vol 19. No. 2 -- 2010
Abstract	Computational grids interconnect hundreds of heterogeneous computing resources from geographically remote sites, designed to meet the large demands of many users from scientific and business domains. A job initiated at one site can be executed by any of the computing resources. Therefore, response time of a job includes processing delay at the site of execution and communication delay for transferring the job from the site of initiation to the site of execution. Load balancing is allocation of jobs to available resources so as to optimize a given objective function. The objective can be achieving a system optimal solution, which tries to minimize the mean response time of all users or an individual optimal solution which tries to minimize each user’s response time. Previous works on load balancing either considered only system optimal objective or individual optimal objective. This paper introduces competitive equilibrium solution, a pricing mechanism for load balancing that independently and simultaneously achieves both system optimal objective and individual optimal objective.
Keywords	Computational Grid, Competitive Equilibrium, Nash Equilibrium, Cooperative Load Balancing, Non Cooperative Load Balancing
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Paper ID:	1464-JATIT-2K10
Title:	CONSTRUCTION AND EVALUATION OF MESHES BASED ON SHORTEST PATH TREE VS. STEINER TREE FOR MULTICAST ROUTING IN MOBILE AD HOC NETWORKS
Author:	JAMES SIMS, NATARAJAN MEGHANATHAN
Source:	Journal of Theoretical and Applied Information Technology Vol 19. No. 2 -- 2010
Abstract	A mobile ad hoc network (MANET) is a network of mobile devices that continuously restructure their topology due to mobility. Proposals on tree-based routing versus mesh-based routing protocols have shown that mesh-based multicast routing gives improved results for MANETs. The main reason for this is because trees are highly susceptible to failure due to frequent mobility. This paper will look at the developing a mesh from two different structures: a shortest path tree and a minimum Steiner tree. In each of the two cases, we extend a tree to a mesh by incorporating edges, which exist in the network graph, between any two constituent nodes of the tree. The goal is to look and determine how the implementation of these two structures can affect the overall performance of the multicast mesh and derive theoretical
Keywords	Keywords: Mobile Ad hoc Networks, Shortest Path Trees, Minimum Steiner Trees, Stability, Multicast, Mesh
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Paper ID:	1478-JATIT-2K10
Title:	RULE BASED EXPERT SYSTEM FOR SELECTING SOFTWARE DEVELOPMENT METHODOLOGY
Author:	M. AYMAN AL AHMAR
Source:	Journal of Theoretical and Applied Information Technology Vol 19. No. 2 -- 2010
Abstract	Software development methodology is a formalized approach that is used to plan and manage the process of developing a software system. Since there are many software development methodologies, one of the challenges faced by software developers is to decide which methodology to apply in a software project. This paper presents the modeling and development of a prototype expert system that helps software project managers and software engineers in selecting the appropriate software development methodology. The developed system is successfully designed as rule based expert system supported with object oriented modeling. The user interaction with the system is based on a user-friendly graphical interface.
Keywords	Software Development Methodology, Expert System, Rule Based Expert System, Object Oriented Modeling
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