August2011

1) Study of High Temperature Superconductor Based Transformer
(pp. 261-267)

Authors: Deepak Jain, Umang Lahoty, Gaurav Pathak, Vishwas Vats and R. Sudha

Abstract - This paper shows the various aspects such as geometry and applications of High Temperature Superconducting (HTS) transformers. The conventional transformer had some drawbacks so our design shifted to HTS transformer. The comparison of both is shown in this paper. Windings, core and cryogenic systems are essential parts of HTS which are discussed here. The major use of HTS in power system is as power transformer, fault current limiter and many more which are discussed. Insulation of parts is also kept in mind while studying the tests and results. Efficiency of HTS with different winding material is compared. So it is a review of HTS transformer considering the various parameters.

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2) A Novel Vector Quantization Technique for Image Compression with Enhanced Fuzzy Possibilistic C-Means using Standard Mahalanobis Distance
(pp. 268-275)

Authors: S. Sathappan, Dr. S. Pannirselvam

Abstract - Fast development in the field of internet and multimedia leads to the better image compression technique in areas like pattern recognition, image processing, system modeling, data mining, etc. Compression techniques have become the most concentrated area in the fields of computer. Image compression is a technique of efficiently coding digital image to reduce the number of bits required in representing an image. Many image compression techniques presently exist for the compression of different types of images. In this paper, Vector Quantization based compression technique is established with Enhanced Fuzzy Possibilistic C-Means (MFPCM) using Standard Mahalanobis Distance. For better determining of the distance between the clusters, this paper uses Standard Mahalanobis Distance. The residual codebook is used in this proposed approach which eliminates the distortion in the reconstructed image and thus enhancing the image quality. Moreover, the proposed technique replaces LBG algorithm with the Enhanced Fuzzy Possiblistic C-Means algorithm using Standard Mahalanobis Distance in the codebook generation. Experimental results on standard image Lena show that the proposed scheme can give a reconstructed image with higher PSNR value than the existing image compression techniques.

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3) Improved Digital Watermarking using Integer Wavelet Transform based audio steganography
(pp. 276-282)

Authors: Prabhakar, S. K. Dekate

Abstract - Steganography quantification is a challenging task for several applications. Compression algorithms are using second generation wavelets nowadays. This paper is for improvement in quantified parameters of steganography using integer wavelet transform. This paper highlights quantified steganography for digital watermarking application to make it more secure, robust and intelligent as well. Use of integer wavelet transform yields improved results. Audio steganography has been given new dimension related to digital watermarking under the use of such wavelet transform. Several results and conclusions also support the view point.

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4) Simulations on phenomenon of subcarrier and sub channelization concept in a transmission over a multipath wireless channel
(pp. 283-287)

Authors: Shah Ahsanul Haque, Mohammad Rakibul Islam, Md. Ashraful Hoque

Abstract - IEEE 802.16 wireless networks, known as WiMAX, employ a mechanism for guaranteed time allocation to mobile stations in order to meet the different quality of service requirements for service flows. The base station allocates contention-based time slots for the stations to transmit their requests for additional bandwidth. Each contention time slot can accommodate a single transmission if there is no sub-channelization or multiple concurrent transmissions if the base station enables sub-channelization during the contention period. For transmission during this period, each station employs a contention-resolution mechanism. In this paper, we developed an analytical model for the bandwidth request and resolution mechanism during this contention period when sub-channelization is employed. The model is shown to accurately model the contention period when sub-channelization is enabled. Performance metrics, such as throughput and capacity, show that adding more subchannels to the contention time slots increases both the throughput and the capacity of the contention period carrying more successful bandwidth requests. Simulations with different parameter sets are carried out to validate the proposed model.

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5) Analysis of Probability factors for permanent channels in a mobile environment
(pp. 288-293)

Authors: Shah Ahsanul Haque, Mohammad Rakibul Islam, Md. Ashraful Hoque

Abstract - WiMAX is the best solution to provide Broadband Wireless Access (BWA) at same data rates offered by Digital Subscriber Line (DSL) etc. Besides BWA it also provides support for cellular mobile phone users as well in the network. High traffic load in a cell results in increasing blocking probability, forced termination and handover failure etc. For this purpose to reduce the probabilities of blocking (Pb), handover failure (Ph), forced termination (Pft) and of not completed calls (Pnc), we have proposed two channel allocation schemes, Non Priority Scheme (NPS) and Reserved Channel Scheme (RCS), in WiMAX Cells. These both schemes are handover schemes, RCS is prioritized handover scheme and NPS is non-prioritized handover scheme. These schemes were previously used for Personal Communications Service (PCS). In PCS there was no support for wireless broadband technology (fixed or mobile), so there was no need of allocating channels permanently.  Fixed wireless broadband users in the mobile WiMAX network require permanent channel allocation as discussed before, so here we have taken permanent channels as well into account. Before we proceed further towards the simulation we need to understand the concept of NPS and RCS deeply.

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6) Development of a Multi Agent System Methodology for Modeling the Complex System
(pp. 294-299)

Authors: Dr. S.Q.Abbas, Devesh Katiyar and Anshu Srivastava

Abstract - This paper introduces the agent oriented methodologies for agent systems and its properties.
Based on literature on agent  technology, properties of agents are explained systematically.
Agent systems are understood as a software architecture type.

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