Welcome to Journal of Theoretical and Applied Information Technology

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We propose a novel approach for solving the perceptual grouping problem in vision. Rather than focusing on local features and their consistencies in the image data, our approach aims at extracting the global impression of an image. We treat image segmentation as a graph partitioning problem and propose a novel global criterion, the normalized cut, for segmenting the graph. The normalized cut criterion measures both the total dissimilarity between the different groups as well as the total similarity within the groups .We show that an efficient computational technique based on a generalized eigen value problem can be used to optimize this criterion. At the heart of unsupervised clustering and semi-supervised clustering is the calculation of matrix Eigen values (eigenvectors) or matrix inversion. In generally, its complexity is O(N3). By using Fast Lanczos Method in Normalized cut Method, we improve the performance to O(N log N). We have applied this approach to segmenting static images, as well as motion sequences, and found the results to be very encouraging.

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In this paper, we propose an Internet payment system which uses a payment gateway to handle the credit card payment transaction between customers, merchants and banks. To test and evaluate the payment system, we build an online travel agency called E-Travel, which simulates a real-life E-Payment application.
On-line travel services including flight reservation, selling of travel accessories, tour guides, and hotel reservation are provided in E-Travel. E-Travel makes use of the proposed payment system to handle the payments transferred between customers and merchants. We implement the payment model as well as E-Travel, and conduct performance evaluation on the payment system. The performance results show that our payment system is easy-to-use, secure, and cost-effective.

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Wireless sensor networks are usually deployed for gathering data from unattended or hostile environment. Several application specific sensor network data gathering protocols have been proposed in research literatures. However, most of the proposed algorithms have given little attention to the related security issues. In this paper we have explored general security threats in wireless sensor network and made an extensive study to categorize available data gathering protocols and analyze possible security threats on them.

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The evolution of information technology and information systems (IS/IT) has included the evolution of research methodologies to support the field. This has fueled the battle of research methodologies among researchers, predominantly caused by the foundations of social sciences and computer technology, which combine to form the business and technology application of information systems and information technology. The questions about appropriate research methodologies in the study of the IS/IT field are continually debated by researchers. The quantitative researchers, founded in technology such as computer science, lean toward the quantitative research method. While the qualitative researchers, founded in the behavioral sciences and organizational behavioral, lean toward the qualitative research method. In the syntheses of IS/IT and the supporting research, mixed method research has illustrated that combining computer science and human behavior requires use of both methodologies practically to advance the knowledge of IS/IT. This literature review looks at various research methodologies and their application to the IS/IT field.

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Direct Torque Control (DTC) for Induction Motors using Matrix Converters is a high performance motor control scheme with fast torque and flux responses. This paper presents a new control scheme based on hybrid particle swarm optimization (HPSO). The main advantages of the matrix converter are combines with those of the DTC technique, generating the required voltage vectors under 0.9 input power factor operations. The results demonstrate the good quality and robustness in the system dynamic response and reduction in the steady-state and transient motor ripple torque.

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The purpose of this study is to determine the educational needs of the faculty members of the School for the Handicapped (SfH) - the only school in Turkey pursuing vocational higher education to the hearing-impaired students- regarding the use of Information and Communication Technologies (ICT). The study was carried out as a qualitative case study. The participants of the study included 3 administrators and 24 faculty members from the SfH. The data were collected through the participant observations by compiling the semi-structured interviews, open-ended questionnaires, researcher’s journal, documents and the archival records. The data have been analyzed inductively. The perspectives of both the administrators and the faculty members about the use of ICT revealed important evidence for determining the present case concerning the ICT integration process in the SfH. The data have been discussed in the light of the related research.

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This paper deals with the performance comparison of compound active clamping boost converter with the two inductor boost converter. The simulation is carried out on the open loop systems of compound active clamping and two inductor boost converters and is verified with the hardware results. The simulation results closely agree with the hardware results.

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This paper deals with the implementation of a computer program, which employs Genetic Algorithms (GAs) in the quest for an optimal class timetable generator. The program is written in Java and incorporates a repair strategy for faster evolution. This paper also explains an example usage of Genetic Algorithms (GAs) for finding optimal solutions to the problem of Class Timetable. It is seen that the GA could be improved by the further incorporation of repair strategies, and is readily scalable to the complete timetabling problem. The system at present does not take care of other constraints like unavailability of lecturers, small size of rooms and time required by the lecturer to move from one class to other class, which is to be considered in the future up gradations. The automated class timetable is used at the dept. of Computer Science & Engineering, Guru Nanak Institute of Technology (GNIT), Hyderabad, India and in future it will be used by other faculty administrators and proposes solutions to be considered by the parties involved: administration, departments and students.

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The lack of formal semantics in the existing formalisms describing multi-agents models combined with multi-agents systems complexity are sources of several problems during their development process. Formal methods are known to bring rigorous and precise descriptions. In previous papers, we have proposed a formal and generic framework called AUML-Maude allowing formal description and validation of AUML model with Maude. This language, based on rewriting logic, offers a rich notation supporting formal specification, implementation and verification of concurrent systems. In this paper, we enrich the translation AUML-Maude by new ideas and we propose a rewriting logic based tool for the edition and the analysis of AUML model. The tool allows to the user to draw AUML system graphically and translates the graphical representation to Maude specification for analysis. This tool allows preserving the graphic notations offered by AUML model for clarity and getting a formal specification in Maude for formal semantics and analysis.

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High Speed PM Motors are popularly used in Spacecraft flywheel application. So, this paper proposes two different designs: one for classical sizing and the other for genetic one at 50 kW output power with 250 m/s tip speed. These two design trials of High Speed Permanent Magnet Synchronous Motors (HSPMSMs) are simulated with MATLAB, and Genetic Algorithm Toolbox. Then, the two design examples comparisons are introduced in analytical forms with study of machines waveforms, Total Harmonic Distortion (THD) and rotor losses. Finally, the effect of poles number on some sizing parameters and motor characteristics are illustrated in the form of charts with the waveforms. This is done at constant number of slots and phases with number of poles are 4, 6, and 12 at 50 kW output power and tip speeds of 250, 200, 150, and 100m/s