Welcome to Journal of Theoretical and Applied Information Technology

Author:

Meziane.Salima, Toufouti.Riad, 1Benalla.Hocine

Source:

Journal of Theoretical and Applied Information Technology          pp 6-14,  2008       

Abstract

With an aim of improving the field oriented control, the control of the induction motor by Input-Output linearization techniques are used to track torque and rotor flux and the scheme is extended for speed control is presented. A comparative study between the performances of the proposed controller and field oriented control is carried out. The methods are compared in terms of their ability to handle loads on the motor shaft, their speed tracking capability and their sensitivity to operating condition variations. To estimate the rotor flux, an open loop observer is used. Index Terms-Nonlinear Control, induction motors, field orientation, input output linearization, observer. Simulation results show the effectiveness of the proposed method.

Author:

S. Tara Kalyani,  G. Tulasiram Das

Source:

Journal of Theoretical and Applied Information Technology          pp 15-21, 2008       

Abstract

The Unified Power Flow Controller (UPFC) is the most versatile and complex power electronic equipment that has emerged for the control and optimization of power flow in electrical power transmission system.  This paper presents real and reactive power flow control through a transmission line by placing UPFC at the sending end using computer simulation.   When no UPFC is installed, real and reactive power through the transmission line can not be controlled. This paper presents control and performance of UPFC intended for installation on that transmission line to control power flow.  A control system which enables the UPFC to follow the changes in reference values like AC voltage, DC voltage and angle order of the series voltage source converter is simulated.  In this control system, a generalized pulse width modulation technique is used to generate firing pulses for both the converters.  Installing the UPFC makes it possible to control an amount of active power flowing through the line.  Simulations were carried out using MATLAB and PSCAD software to validate the performance of the UPFC.

Author:

Dr.S.S.Riaz Ahamed

Source:

Journal of Theoretical and Applied Information Technology          pp  22-30, 2008       

Abstract

Orthogonal Frequency-Division Multiplexing (OFDM) — essentially identical to Coded OFDM (COFDM) — is a digital multi-carrier modulation scheme, which uses a large number of closely-spaced orthogonal sub-carriers. Each sub-carrier is modulated with a conventional modulation scheme (such as quadrature amplitude modulation) at a low symbol rate, maintaining data rates similar to conventional single-carrier modulation schemes in the same bandwidth. In practice, OFDM signals are generated and detected using the Fast Fourier transform algorithm.

Author:

 Niranjan V. , Mahmood, R. ,Kalaivani.A. and Sudha.S.

Source:

Journal of Theoretical and Applied Information Technology          pp 31-55 ,  2008       

Abstract

Cancer results due to mutations that occur within our genetic material. A small proportion of our genes are directly involved in maintaining normal cell growth; mutations that occur within these genes can eventually lead to cancer. Stevenson et al. was the first to discover the various reasons for the occurrence and the prevalence of cancer with the X-Chromosomal disorders. Our research focused on finding out the cancerous genes located on X –chromosome and the study of their expression. We found in majority were in the tissues of nervous systems, liver, pancreas and prostate which is characteristics of higher mammalians. Hence the sex chromosomes play a major role in cancer. Another important conclusion we were able to draw from the analysis is that CT antigens and its homologs were found to be most important in cancer and hence we investigated on MAGEE1 the most important CT antigens, which was found to be more responsible for causing cancer, Several databases were made use of in the comprehensive analysis of the magee1 gene. An extensive analysis of the magee1 gene including modeling of its structure may prove useful in designing a drug for cancer treatment.

Author:

 Challa Narasimham, Jayaram Pradhan

Source:

Journal of Theoretical and Applied Information Technology          pp 56-60 ,  2008       

Abstract

In order to achieve the security for the e-business application, generally the organizations follow the cryptographic methods. The two widely accepted and used cryptographic methods are symmetric and asymmetric. The DES ideally belongs to the category of symmetric key cryptosystem and RSA, NTRU belongs to the category of asymmetric key cryptosystem. Symmetric key ciphers use the same key for encryption and decryption, or the key used for decryption is easily calculated from the key used for encryption. Symmetric key ciphers can be broadly grouped into block ciphers and stream ciphers. Symmetric encryption has a troublesome drawback i.e., two people who wish to exchange confidential messages must share a secret key. The key must be exchanged in a secure way. Key distribution is difficult among the parties. .RSA is one of the oldest and the most widely used public key cryptographic algorithms. It was the first algorithm known to be suitable for signing as well as encryption. The system works on two large prime numbers, from which the public and private keys will be generated. NTRU (Nth degree truncated polynomial ring units) is a collection of mathematical algorithms based on manipulating lists of very small integers. NTRU is the first secure public key cryptosystem not based on factorization or discrete logarithmic problems. The keys are generated by having small potent polynomials from the ring of truncated polynomials. Finally we proceed with the key generation, encryption and decryption of the plain text required by implementing the algorithms of both the cryptosystems. Though the limitations are there in the symmetric key cryptosystem, we proposed and tested all the methods for variable sized text files. This paper presents the comparative study of DES, RSA and NTRU algorithms for variable sized text files as input and the results were observed, analyzed and compared so as to identify which method is appropriate to the business needs.

Author:

 Omar Al Jadaan, Lakishmi Rajamani, C. R. Rao

Source:

Journal of Theoretical and Applied Information Technology          pp 61-68 ,  2008       

Abstract

Multi-objective evolutionary algorithms (EAs) that use non-dominated sorting and sharing have been criticized. Mainly for their: 1- computational complexity (where M is the number of objectives and N is the population size). 2- Non-elitism approach; 3-the need for specifying a sharing parameter. In this paper, a method combining the new Ranked based Roulette Wheel selection algorithm with Pareto-based population ranking Algorithm is proposed, named Non-dominated Ranking Genetic Algorithm (NRGA), which alleviates most of the above three difficulties. A two tier ranked based roulette wheel selection operator is presented that creates a mating pool from the parents’ population by selecting the best (with respect to fitness and spread) solutions stochastically. Simulation results on benchmark test problems show that the proposed NRGA, in most of the problems, is able to find much better spread of solutions and faster convergence near the true Pareto-optimal front compared to NSGA-II other elitist MOEA that pay special attention to creating a diverse Pareto-optimal front. Much better performance of NRGA is observed.

Author:

 Abdullah Çevik & Yavuz Akbulut

Source:

Journal of Theoretical and Applied Information Technology          pp 69-73 ,  2008       

Abstract

The current study aims to contribute to classroom instruction of undergraduate education faculty students through development of an online contest, and evaluation of test items based on participants’ responses. The study was first presented at the 7th International Educational Technology Conference in the Turkish Republic of Northern Cyprus. It is a pilot study which covers four units of a single course offered in the Department of Computer Education and Instructional Technologies at Anadolu University. Students are provided with the opportunity to practice their skills on-line whenever and wherever they want. The research process involved four successive and interdependent steps, namely design, development, application and evaluation. An on-line testing program which has both a learner and instructor version was prepared. Questions were gathered from different sources along with the ones prepared by researchers. Item facility, item discrimination and distractor efficiency indices of questions were calculated by the program after it was piloted with 32 undergraduate students. Features of the program and implications for instruction were provided as well.

Author:

C.Senthamarai, A.Krishnan

Source:

Journal of Theoretical and Applied Information Technology          pp 74-79 ,  2008       

Abstract

Grid Computing has been identified as an important new technology in scientific and engineering fields as well as many commercial and industrial enterprises. Grid Computing is a form of distributed computing that involves coordination and sharing of computing application, data storage or network resources across dynamic and geographically dispersed organizations. In short, it involves virtualizing computing resources. Grids provide an infrastructure that allows for flexible, secure, coordinated resource sharing among dynamic collections of individuals, resources, and organizations. In this paper we develop an application framework for remote data monitoring in Power Distribution System by using Grid Computing. Using this framework it is easy to monitor and control the parameters such as voltage, load, frequency and power factor in electrical power distribution system. By monitoring all these parameters the line loss can be predicted and can be reduced so that the revenue will automatically be increased in the Power Distribution system by using this Application framework.

Author:

KHALIL SHIHAB, HAIDER RAMADHAN

Source:

Journal of Theoretical and Applied Information Technology          pp 80-94 ,  2008       

Abstract

Satisfactory system performance requires a continuous adjustment of tunable system parameters. These parameters are typically used to minimize the execution time. However, by the coupling of a performance model with an application, system parameters can be determined without user intervention. In this work presented here, a novel performance prediction system has been used to provide suitable performance models which can determine application mapping parameters, code execution decisions, and system choices on-the-fly. The method uses heuristics and system performance tools to the diagnosis of bottlenecks and provides the necessary remedies to achieve acceptable computer performance. The work introduces a parameter prioritizing tool to focus on those performance critical parameters. It also demonstrates how to reduce the time when tuning a large system with many tunable parameters. The search space can be reduced by checking the relations among parameters to avoid unnecessary search.

Author:

Dr Jayanthi Ranjan, Prof Pooja Tripathi

Source:

Journal of Theoretical and Applied Information Technology          pp 95-104 ,  2008       

Abstract

Competency Based Management (CBM) has become vital to any firm’s strategic position and organizational decision making. The role of Expert System (ES) is to provide a knowledge based information system that is expected to have human attributes in order to replicate human capacity in ethical decision making. In this paper a holistic framework is proposed to review the ES approach that will be practically feasible for organizational settings. It is based on the psychological conceptions of human competence and performance in the workplace. We explain the application of ES that can be used in an institute to systematically assess existing and future competencies required. Using an ES approach to Educational Institute with CBM will be able to more effectively use their limited resources to reap the more benefits from their investments in both people and technology.