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Roy B.,Tripura Institute of Technology | Dasgupta R.,National Institute Of Technical Teachers Training And Research | Chaki N.,University of Calcutta
Advances in Intelligent Systems and Computing | Year: 2016

In recent years, despite several risk management models proposed by different researchers, software projects still have a high degree of failures. Improper risk assessment during software development was the major reason behind these unsuccessful projects as risk analysis was done on overall projects. This work attempts in identifying key risk factors and risk types for each of the development phases of SDLC, which would help in identifying the risks at a much early stage of development. © Springer India 2016.

Bhattacharya P.,National Institute of Technology Agartala | Biswas A.,Tripura Institute of Technology | Maity S.P.,Bengal Engineering and Science University
Smart Innovation, Systems and Technologies | Year: 2014

This paper introduces efficient and fast algorithms for unsupervised image segmentation, using low-level features such as color and texture. The proposed approach is based on the clustering technique, using 1. Lab color space, and 2. the wavelet transformation technique. The input image is decomposed into two-dimensional Haar wavelets. The features vector, containing the information about the color and texture content for each pixel is extracted. These vectors are used as inputs for the k-means or fuzzy c-means clustering methods, for a segmented image whose regions are distinct from each other according to color and texture characteristics. Experimental result shows that the proposed method is more efficient and achieves high computational speed. © Springer International Publishing Switzerland 2014.

Roy B.,Tripura Institute of Technology | Banik S.,Government of Tripura | Chaki N.,University of Calcutta | Saha B.,Tripura Institute of Technology
Proceedings - 2nd International Conference on Advances in Recent Technologies in Communication and Computing, ARTCom 2010 | Year: 2010

The challenges of mobile ad hoc network are to maintain quality of services and performance. Many routing protocols like AODV discover routes whenever required by the source node and the benefit in doing so is that no prior knowledge of the topology is required. The AODV routing protocol is commonly and effectively used for mobile, ad-hoc nodes [4, 7, 8, 15, 22, 23]. So far, many maintenance strategies have been proposed on AODV to provide better QoS services [7, 10, 19, 21] performances. Some has used the radio propagation characteristics of mobile nodes in ad hoc network [12, 23] during route maintenance [22]. Some modification has been done on computation of delay parameter [16, 19, 22]. The other modification was on multi route selection during route discovery considering only delay as QoS parameter [5, 23]. This paper aims towards proposing a new route maintenance strategy with multiple options that will lead to better performance during link failure on a route. During route discovery and route reply procedure [26] two different QoS parameters considered here are delay and bandwidth. The routes should be selected during route discovery process. The route maintenance strategy may be applied to both the routes independently and simultaneously by the internal nodes where the link failure has occurred. © 2010 IEEE.

Upadhyaya B.K.,Tripura Institute of Technology | Misra I.S.,Jadavpur University | Sanyal S.K.,Jadavpur University
Proceedings of 2010 13th International Conference on Computer and Information Technology, ICCIT 2010 | Year: 2010

Wireless technology is the fastest growing segment of the modern communication industry. The IEEE 802.16e standard, commonly known as mobile WiMAX, is the latest wireless technology that has promised to offer Broadband Wireless Access over long distance. The concept of OFDM is used in WiMAX to obtain high data rate in addition to reducing the effects like inter symbol interference and inter channel interference. It has proved to be the air interface for next generation Broadband Wireless System. In this paper, we present a finite state machine based novel technique to model the Address Generation circuitry of WiMAX multimode interleaver using VHDL on FPGA platform with all code rates and modulation schemes of IEEE 802.16e standard. Our approach provides better performance in terms of maximum operating frequency, use of flip-flops with negligible loss in terms of logic cells utilized compared to existing FPGA based implementations. Measured circuit parameters and software simulation of this model are also provided. ©2010 IEEE.

Dey D.,Tripura Institute of Technology | Goswami T.,Tripura Institute of Technology
Journal of Biomedicine and Biotechnology | Year: 2011

The dimension of biomolecules is of few nanometers, so the biomolecular devices ought to be of that range so a better understanding about the performance of the electronic biomolecular devices can be obtained at nanoscale. Development of optical biomolecular device is a new move towards revolution of nano-bioelectronics. Optical biosensor is one of such nano-biomolecular devices that has a potential to pave a new dimension of research and device fabrication in the field of optical and biomedical fields. This paper is a very small report about optical biosensor and its development and importance in various fields. Copyright © 2011 D. Dey and T. Goswami.

Das S.,Tripura Institute of Technology | Ghoshal D.,National Institute of Technology Agartala
ARPN Journal of Engineering and Applied Sciences | Year: 2016

Image compression based on fractal coding is a lossy compression technique and normally utilize for gray level images in range and domain blocks of rectangular shape. Fractal based digital image compression techniques' provides a large compression ratio and it is proposed using nearest neibourhood interpolation using isosceles triangle segmentation. In the present study a partitioned iterative function searching based on isosceles triangle shape dimension of image plane has been considered. During the searching the intensity of each pixel needs be transformed and this is done with intensity interpolation based on nearest neighborhood intensity interpolation. The proposed method has yielded higher PNSR with marginally lesser processing time but with very high compression ratio. It is established that the proposed method is suitable for face image as well as natural object images. © 2006-2016 Asian Research Publishing Network (ARPN).

Koch A.,North - Eastern Hill University | Kumar A.,University of the West Indies | De A.K.,Tripura Institute of Technology | Phukan A.,North - Eastern Hill University | Lal R.A.,North - Eastern Hill University
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014

Three new homotrinuclear copper(II) complexes [Cu3(slmh)(μ- Cl)2(CH3OH)3]·0.5CH3OH (1), [Cu3(slmh)(NO3)2(CH3OH) 5]·1.5CH3OH (2) and [Cu3(slmh)(μ- ClO4)2(CH3OH)3]·2CH 3OH (3) from disalicylaldehyde malonoyldihydrazone have been synthesized and characterized. The composition of the complexes has been established on the basis of data obtained from analytical and thermoanalytical data. The structure of the complexes has been discussed in the light of molar conductance, electronic, FT-IR and far-IR spectral data, magnetic moment and EPR spectral studies. The molar conductance values for the complexes in DMSO solution indicate that all of them are non-electrolyte. The magnetic moment values for the complexes suggest considerable metal-metal intramolecular interaction between metal ions in the structural unit of the complexes. The EPR spectral features reveal that at RT, the ground state for the complexes is a mixture of the quartet state (S = 3/2) and doublet state (S = ½). At lower temperature, the ground state for the complexes is dx 2-y2 with considerable contribution from dz2 orbital. Dihydrazone ligand is present in enol form in all of the complexes. The complexes have distorted square pyramidal stereochemistry. The electron transfer reactions of the complexes have been investigated by cyclic voltammetry. Hydrogen peroxide mediated oxidation of benzyl alcohol catalyzed by complex 1 has been studied. © 2014 Elsevier B.V. All rights reserved.

Upadhyaya B.K.,Tripura Institute of Technology | Sanyal S.K.,Jadavpur University
IEEE Transactions on Circuits and Systems II: Express Briefs | Year: 2013

In this brief, a low-complexity and novel technique is proposed to efficiently implement the address generation circuitry of the 2-D deinterleaver used in the WiMAX transreceiver using the Xilinx field-programmable gate array (FPGA). The floor function associated with the implementation of the steps, required for the permutation of the incoming bit stream in channel interleaver/deinterleaver for IEEE 802.16e standard is very difficult to implement in FPGA. A simple algorithm along with its mathematical background developed in this brief, eliminates the requirement of floor function and thereby allows low-complexity FPGA implementation. The use of an internal multiplier of FPGA and the sharing of resources for quadrature phase-shift keying, 16-quadrature-amplitude modulation (QAM), and 64-QAM modulations along with all possible code rates makes our approach to be novel and highly efficient when compared with conventional look-up table-based approach. The proposed approach exhibits significant improvement in the use of FPGA resources. Exhaustive simulation has been carried out to claim supremacy of our proposed work. © 2004-2012 IEEE.

Das S.,Tripura Institute of Technology | Ghoshal D.,National Institute of Technology Agartala
International Journal of Applied Engineering Research | Year: 2016

Fractal based digital image compression is a very specific technique in the field of color image compression. The method is best suited for irregular shape of image like snow bobs, clouds, flame of fire; tree leaves images, depending on the fact that parts of an image often resemble with other parts of the same image. Fractal coding has not been widely used because of its long encoding time and high computational complexity. This image compression has received much attention from the research community because of some desirable properties like resolution independence, fast decoding, and very competitive rate-distortion curves. Despite the advances made, the long computing times in the encoding phase still remain the main disadvantages of this technique. However, many solutions have been proposed for this problem, but there is not yet a standard for fractal coding. In this paper we proposed fractal coding based on equilateral triangle segmentation and apply graph-based image segmentation to fractal image compression, separating the initial image into many logic areas, and then encoding each area with fractal image compression method. Experimental results show that, compared with the typical approaches, proposed approach can accelerate the fractal coding speed on the premise of guaranteeing the decoded images quality. Proposed hybrid scheme incorporating fractal compression and speedup techniques have achieved high compression ratio compared to pure fractal compression. © 2016, Research India Publications.

Chakraborty K.,Tripura Institute of Technology | De A.,Bengal Engineering and Science University | Chakrabarti A.,Bengal Engineering and Science University
Computers and Electrical Engineering | Year: 2012

Self-organizing feature map (SOFM) in conjunction with radial basis function (RBF) has been applied in this paper to determine and classify the voltage stability states of a multi-bus power network. Simulations were carried out on a real 203-bus system of an Indian power utility considering load changes and contingencies. The data collected from simulations are then used as inputs to the SOFM which acts as a classifier to classify the voltage stability states of the system under test. To augment the effectiveness of the proposed method, the initial classification results were improved with the application of RBF technique. Studies show that the SOFM-RBF combination delivers high classification accuracy in the order of almost 100% and can be considered an effective soft-computing tool to ease the operation of large-multi bus power network under variable operating conditions. © 2012 Elsevier Ltd. All rights reserved.

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