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Dubey A.K.,Motilal Nehru National Institute of Technology | Nagaria R.K.,Motilal Nehru National Institute of Technology | Pal P.K.,Motilal Nehru National Institute of Technology | Singh R.K.,K.N.I.T.
Proceeding - IEEE International Conference on Computing, Communication and Automation, ICCCA 2016 | Year: 2016

A constant-gm, rail-to-rail operational amplifier circuit topology is presented in this paper. The amplifier input stage is realized using single NMOS pair at 0.13μm bulk-CMOS process technology. The overall gain variation is within the range of ±2.338% for the rail-to-rail common mode input range. The proposed design is able to reject the common mode input response with 115dB of common mode rejection ratio (CMRR). High slew rate is achieved and the simulated value is +19/-43 (V/μs) of an unity gain buffer op-amp at 5pF of CL. The variation in overall gm and gain are also simulated at different corner temperatures. The circuit simulation is done in Tanner EDA at 1.8 V of power supply which dissipates the power of 6.1mW. © 2016 IEEE.

Kumari M.,Indian Institute of Science | Pop I.,Technical University of Cluj Napoca | Nath G.,KNIT
International Journal of Non-Linear Mechanics | Year: 2010

The transient boundary layer flow and heat transfer of a viscous incompressible electrically conducting non-Newtonian power-law fluid in a stagnation region of a two-dimensional body in the presence of an applied magnetic field have been studied when the motion is induced impulsively from rest. The non-linear partial differential equations governing the flow and heat transfer have been solved by the homotopy analysis method and by an implicit finite-difference scheme. For some cases, analytical or approximate solutions have also been obtained. The special interest are the effects of the power-law index, magnetic parameter and the generalized Prandtl number on the surface shear stress and heat transfer rate. In all cases, there is a smooth transition from the transient state to steady state. The shear stress and heat transfer rate at the surface are found to be significantly influenced by the power-law index N except for large time and they show opposite behaviour for steady and unsteady flows. The magnetic field strongly affects the surface shear stress, but its effect on the surface heat transfer rate is comparatively weak except for large time. On the other hand, the generalized Prandtl number exerts strong influence on the surface heat transfer. The skin friction coefficient and the Nusselt number decrease rapidly in a small interval 0 < t* < 1 and reach the steady-state values for t* > 4. © 2010.

Prakash S.,Thapar University | Sinha S.K.,KNIT
IETE Journal of Research | Year: 2015

In this paper, artificial neural network (ANN) and fuzzy-based adaptive neuro-fuzzy inference system (ANFIS) approach to automatic generation control of three unequal area hydro-thermal power systems has been introduced. The proposed ANFIS controller combines the advantages of fuzzy controller as well as quick response and adaptability nature of ANN. Area 1 and area 2 consist of thermal reheat power plant whereas area 3 consists of hydro power plant with electric governor. Performance evaluation is carried out by using ANN, fuzzy, and ANFIS control approaches. To enhance the performance of intelligent controller, sliding surface is included. The performances of the controllers are simulated using MATLAB/SIMULINK software. A comparison of ANFIS, ANN, fuzzy-based approaches shows the superiority of proposed ANFIS over ANN, fuzzy for change in frequency and tie-line power deviation in three area interconnected power system. © 2015 Copyright © 2015 by the IETE.

Kaur P.,K.N.I.T. | Singh A.,Indian Institute of Technology BHU Varanasi
Proceedings of 2012 2nd IEEE International Conference on Parallel, Distributed and Grid Computing, PDGC 2012 | Year: 2012

Now-a-days Social Networking Sites (SNS) are increasingly gaining its importance to share thoughts, views, culture, status, image, video etc. in various domains such as academics, religion, politics, research and development. Apart of these strengths of SNS it has one major disadvantage which is inefficient authentication of user login. Due to this various types of fake message, personal or national threats, non-social activities, vulgar and harassing figures and videos etc. are posted by some imposters or non social personals. To the best of our knowledge there is no any technique reported in the literature to solve this very big social problem. To defeat this attack we have prepared our own SNS with embedding of face recognition technique at the time of registration of login in the site. Four holistic based algorithms PCA, LDA, ICA and SVM are used for evaluation and found very promising results ranges 79.77% ∼ 93.10% at various protocols. © 2012 IEEE.

Payasi R.P.,KNIT | Singh A.K.,Motilal Nehru National Institute of Technology | Singh D.,Indian Institute of Technology BHU Varanasi
International Review of Electrical Engineering | Year: 2012

The optimum location and size of distributed generation (DG) are affected with many factors. Some important factors, which must be considered in distributed generation planning (DGP), are load model, seasonal variations in load, and voltage step constraint. In previous works, the load model and voltage step constraint are considered separately by different authors. Further, the effect of voltage step on size of DG has been considered for fixed locations and particular operating power factor of DG. In this paper, the voltage step constraint, load model, and seasonal variations in load are considered together. An investigation into optimal location, size, and power factor of DG considering voltage step constraint and mixed load model is performed. The types of DGs capable of delivering real power as well as capable of delivering both real and reactive power are compared. The investigation shows that voltage step constraint is more effective for constant power load model, and the optimum size of DG may also increase with optimum location, instead of decrease. © 2012 Praise Worthy Prize S.r.l. - All rights reserved.

Singh S.,Allahabad University | Siddiqui T.J.,Allahabad University | Singh R.,Allahabad University | Singh H.V.,K.N.I.T.
2011 International Conference on Multimedia, Signal Processing and Communication Technologies, IMPACT 2011 | Year: 2011

In this paper, we propose DCT-domain robust data hiding algorithm using chaotic sequence. The algorithm works by dividing the cover into blocks of equal sizes and then embeds the watermark in middle band of DCT coefficient. Performance evaluation for robustness and imperceptibility of proposed algorithm has been made using the bit error rate (BER) and the peak signal to noise ratio (PSNR) value for cover image and watermarked image. This algorithm is compared to PN sequence based DCT algorithm. The proposed algorithm provides more robustness against several common image processing attacks, such as JPEG compression, low-pass filtering and addition of noise. In case of JPEG compression attacks, for low quality compression (Q-60) it has been analyzed that more than 92% of the hidden data was recovered without any error and for same quality compression in PN sequence based DCT algorithm has more than 89% of the hidden data recovered without any error. © 2011 IEEE.

Singh S.,KNIT | Singh H.V.,KNIT | Mohan A.,National Institute of Technology Kurukshetra
Procedia Computer Science | Year: 2015

In this paper, we propose secure and robust data hiding algorithm based on hiding in random coefficients of Discrete Wavelet Transform and student t-distribution. The watermark image is scrambled to increases its security and robustness. Performance evaluation for robustness and imperceptibility of proposed algorithm has been made using bit error rate (BER) and peak signal to noise ratio (PSNR) value for different watermark and cover images such as Lena, Gibbon and Fruit images. The experimental results demonstrate that the proposed algorithm achieves higher security and robustness against JPEG compression as well as other attacks such as addition of noise, low pass filtering and cropping attacks compared to other existing algorithm using DWT coefficients.

Kumar R.,KNIT | Singh S.P.,KNIT | Kumar B.,NSIT
Procedia Computer Science | Year: 2016

In this paper a modulator based on ANN for power quality improvement is presented. A low computational intensive ANN based SVPWM is designed for controlling a three-phase neutral clamped bidirectional three level rectifier. The performance of the system with SPWM and SVPWM technique is investigated and compared under different operating conditions through a developed simulation model in MATLAB/Simulink environment. © 2016 The Authors. Published by Elsevier B.V.

Kumari M.,Indian Institute of Science | Nath G.,KNIT
International Journal of Non-Linear Mechanics | Year: 2010

The unsteady mixed convection flow of an incompressible laminar electrically conducting fluid over an impulsively stretched permeable vertical surface in an unbounded quiescent fluid in the presence of a transverse magnetic field has been investigated. At the same time, the surface temperature is suddenly increased from the surrounding fluid temperature or a constant heat flux is suddenly imposed on the surface. The problem is formulated in such a way that for small time it is governed by Rayleigh type of equation and for large time by Crane type of equation. The non-linear coupled parabolic partial differential equations governing the unsteady mixed convection flow under boundary layer approximations have been solved analytically by using the homotopy analysis method as well as numerically by an implicit finite difference scheme. The local skin friction coefficient and the local Nusselt number are found to decrease rapidly with time in a small time interval and they tend to steady-state values for t*≥5. They also increase with the buoyancy force and suction, but decrease with injection rate. The local skin friction coefficient increases with the magnetic field, but the local Nusselt number decreases. There is a smooth transition from the unsteady state to the steady state. © 2010 Elsevier Ltd. All rights reserved.

Kumari M.,Indian Institute of Science | Nath G.,KNIT
Proceedings of the National Academy of Sciences India Section A - Physical Sciences | Year: 2012

The unsteady rotating flow of an incompressible laminar viscous electrically conducting fluid over an impulsively rotated infinite disk in the presence of magnetic field and suction is investigated. We have considered the situation where there is a steady state initially (i.e., at t = 0, the fluid is rotating with constant angular velocity over a stationary disk). Then at t > 0, the disk is suddenly rotated with a constant angular velocity either in the same direction or in opposite direction to that of the fluid rotation which causes unsteadiness in the flow field. The effect of the impulsive motion is found to be more pronounced on the tangential shear stress than on the radial shear stress. When the disk and the fluid rotate in the same direction, the tangential shear stress at the surface changes sign in a small time interval immediately after the start of the impulsive motion. © The National Academy of Sciences, India 2012.

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