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Chakraborty K.,Tripura Institute of Technology | Deb G.,Tripura University | Deb S.,National Institute of Technology Agartala
1st IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems, ICPEICES 2016 | Year: 2016

Load demands on distribution system is growing rapidly. So, the distribution system is operating nearer to the stability boundary. A stability index named line stability indicator (LSI) is developed in this paper for voltage stability analysis of radial distribution system. The applicability of the indicator is tested on a standard (IEEE) 33-bus Radial Distribution System. To find the value of proposed indicator for different lines of the system under consideration MATLAB code is used. This indicator is able to find the weak lines of the system. By using FACTS device at the receiving end side of the weak line the voltage level of buses of the system can be improved. Results indicate that installation of FACTS device at the appropriate bus will make the whole system more stable in respect of voltage. © 2016 IEEE.

Deb G.,Tripura University | Chakraborty K.,Tripura Institute of Technology | Deb S.,National Institute of Technology Agartala
1st IEEE International Conference on Power Electronics, Intelligent Control and Energy Systems, ICPEICES 2016 | Year: 2016

Voltage stability is one of the important issues of power system. Voltage stability should be maintained for secure operation of power system. Bus voltages regarding maximum reactive power loading is used in this paper for analysis of voltage stability. To test the applicability of the concerned method the reactive loads are increased by a constant factor. The proposed technique is applied on standard IEEE 14 bus test system. Load flow analysis of Newton Raphson method is coded in MATLAB programming for finding different parameters of the system and utilised for the stability analysis. The result from the proposed index is also verified by another standard indicator named 'reactive power sensitivity index'. Test results show the effectiveness of the proposed technique. FACTS device is utilised in the weakest bus to improve its voltage stability. © 2016 IEEE.

Das S.,Tripura Institute of Technology | Ghoshal D.,National Institute of Technology Agartala
Asian Journal of Information Technology | Year: 2016

Fractal geometry has been found to be an unbelievable breakthrough in solving the segmentation and compression problems of digital images. In present study, effect of variations of colour schemes has been studied with the help of various types of geometrical topology for the basic segmentation process. The most and popular RGB colour space performance has been compared with HSI colour space along with quad tree and isosceles geometrical segmentation. It has been found that hue-situation intensity scheme is superior to RGB schemes for the measurement of PSNR. The execution time for isosceles triangle based geometrical segmentation yield lower processing time. The major efficiency of the study is Multifoods compression ratio when HSI scheme has been adopted. Both types of segmentation viz. Quad tree and isosceles triangle approach have produced nearly four times increment in compression ratio. During the transformation all the channels, e.g., RGB and HSI have been treated separately. The results have been compared with those available from recent literature and it has been found that the proposed schemes of sequence of studies are superior to the earlier ones. © Medwell Journals, 2016.

Chakraborty K.,Tripura Institute of Technology | Saha G.,Tripura Institute of Technology
2016 International Conference on Intelligent Control, Power and Instrumentation, ICICPI 2016 | Year: 2016

Coming days are becoming a much challenging task for the power system researchers due to the anomalous increase in the load demand with the existing system. As a result there exists a discordant between the transmission and generation framework which is severely pressurizing the power utilities. In this paper a quick and efficient methodology has been proposed to identify the most sensitive or susceptible regions in any power system network. The technique used in this paper comprises of correlation of a multi-bus power system network to an equivalent two-bus network along with the application of Artificial neural network(ANN) Architecture with training algorithm for online monitoring of voltage security of the system under all multiple exigencies which makes it more flexible. A fast voltage stability indicator has been proposed known as Unified Voltage Stability Indicator (UVSI) which is used as a substratal apparatus for the assessment of the voltage collapse point in a IEEE 30-bus power system in combination with the Feed Forward Neural Network (FFNN) to establish the accuracy of the status of the system for different contingency configurations. © 2016 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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