Netaji Subhas Institute of Technology formerly Delhi Institute of Technology established in 1983. NSIT is one of the top engineering college in India. It is an autonomous institution of the Government of Delhi. The campus is situated at Azad Hind Fauj Marg, Sector - 3, Dwarka, New Delhi. The institute is affiliated to University of Delhi and was ranked as the 12th top engineering college by outlook india in 2014. Wikipedia.
Rana K.P.S.,Netaji Subhas Institute of Technology
Expert Systems with Applications | Year: 2011
A fuzzy logic based digital time domain sinusoidal acceleration waveform amplitude controller for an electrodynamic shaker is presented. The purpose of Fuzzy Logic Control (FLC) is to reproduce a pre-defined sinusoidal acceleration amplitude profile (in amplitude, frequency and time) at the shaker table. Sinusoidal vibration profiles (sine and logarithmic sine sweep) are considered for a controlled vibration generation in typical automotive and aerospace testing. The difficulty in sine sweep testing is that the non-rigid load dynamics are unknown and it can severely modify the shaker's performance during sweep test. Since a logarithmic frequency sweep is normally used, a controller needs to be robust to un-modeled dynamics and also fast enough to hold the desired acceleration amplitude within predefined limits throughout the sweep test. The controller structure is developed based on the usual power amplifier technology. The control action is implemented on a waveform-by-waveform basis and a FLC is developed in the LabVIEW environment on a PXI platform for real time control of the shaker. To attenuate the shaker suspension mode resonance a compensator based on electromechanical model of the shaker is designed and cascaded to FLC. The shaker model, suspension mode compensator design, FLC synthesis and experimental implementation results are presented in this paper. © 2011 Elsevier Ltd. All rights reserved.
Lahiri A.,Netaji Subhas Institute of Technology
Analog Integrated Circuits and Signal Processing | Year: 2011
This letter comments on the recently published paper in  which provides realizations of minimum component quadrature sinusoidal oscillators. On re-examination of the 'Type 3' oscillator circuits in , it has been found that the circuits actually suffer from 'latch up' problem due to use of incorrect polarity of the CCII based negative-impedance convertor. This problem has been corrected (without altering the characteristic equation) by swapping the impedances at y and x terminals. Explicit quadrature current outputs are derived similarly as done in . © Springer Science+Business Media, LLC 2011.
Jena J.,Netaji Subhas Institute of Technology
Meccanica | Year: 2012
In this paper, Lie group of transformation method is used to investigate the self-similar solutions for the system of partial differential equations describing a plasma with axial magnetic field (θ-pinch). The arbitrary constants occurring in the expressions for the infinitesimals of the local Lie group of transformations give rise to two different cases of possible solutions i.e. with a power law and exponential shock paths. A particular solution to the problem in one case has been found out. © Springer Science+Business Media B.V. 2011.
Singh J.K.,Netaji Subhas Institute of Technology
Modern Physics Letters A | Year: 2010
A class of non-static solutions to the Einstein field equations has been investigated in the context of Bianchi type-V spacetime in a family of scalartensor theories in the presence as well as absence of the magnetic field. The physical and kinematical behaviors of the models have been discussed. The energy conditions of the models have also been verified. © 2010 World Scientific Publishing Company.
Lahiri A.,Netaji Subhas Institute of Technology
Journal of Circuits, Systems and Computers | Year: 2010
A number of sinusoidal oscillators using current differencing buffered amplifiers (CDBAs) have been reported in the literature. However, only three of them are canonic quadrature oscillators (i.e., requiring two capacitors). The aim of this letter is to present additional realizations of single/dual- resistance-controlled quadrature oscillators using CDBAs. Four voltage-mode quadrature oscillators are proposed, which provide the following advantageous features: (i) use of reduced and canonic component count, viz. two CDBAs, three/four resistors and two capacitors, (ii) all passive components are grounded or virtually grounded, which is favorable from integration point of view and (iii) independent and non-interactive resistor control of the condition of oscillation (CO) and the frequency of oscillation (FO). Simulation results verifying the workability of the proposed circuits have been included. © 2010 World Scientific Publishing Company.
Singla R.K.,Netaji Subhas Institute of Technology
National Academy Science Letters | Year: 2014
Magnolol, phenolic bioactive phytomolecule, is a potential antihepatitis B viral agent. Current study is to mechanistically analyze the probable site of action for magnolol. Magnolol has been docked with EF3-CaM adenylyl cyclase (1PK0), deoxycytidine kinase (2NOA), human nucleoside diphosphate kinase (3FKB), human hepatitis B viral capsid (1QGT), hepatitis B X-interacting protein (3MSH) proteins using GRIP docking methodology, and compared with reference ligands like adefovir diphosphate (active metabolite of adefovir), lamivudine, tenofovir monophosphate (active metabolite of tenofovir) and tenofovir diphosphate (active metabolite of tenofovir). Results revealed its preferential interactability towards 2NOA i.e. deoxycytidine kinase, which raise up its chance to get metabolized into phosphorylated analogs, providing further impetus for discovery and clinical development of semi-synthetic analogs of magnolol. Out of all the virtually designed magnolol derivatives, Leadgrow-ML1449 have superior binding affinities towards all the test proteins except EF3-CaM adenylyl cyclase. © 2014 The National Academy of Sciences, India.
Aggarwal M.,Netaji Subhas Institute of Technology |
Garg P.,Netaji Subhas Institute of Technology |
Puri P.,Netaji Subhas Institute of Technology
Journal of Lightwave Technology | Year: 2014
In this paper, we present analytical expressions for the performance of dual-hop urban optical wireless communication system under the combined influence of atmospheric turbulence induced-fading and misalignment-fading (pointing errors). The system employs an amplify and forward relay with the assumption that channel state information is available at transmitting as well as receiving terminals. The atmospheric turbulence channels are modeled by independent but not necessarily identically distributed (i.n.i.d) Gamma-Gamma fading statistics with pointing error impairments. Using a tight upper bound for the end-to-end signal to noise ratio of the system, we derive the novel closed form expressions for the moment generating function and probability density function all in terms of Meijer's G-function. Based on the aforementioned statistical results, accurate closed-form expressions for average symbol error rate for M-ary phase shift keying modulation schemes, outage probability and the ergodic capacity under four adaptive transmission policies namely optimal rate adaptation, optimal power and rate adaptation, channel inversion with fixed rate and truncated channel inversion with fixed rate are derived in terms of Meijer's G -function function. Finally, the proposed mathematical analysis is accompanied with various numerical examples to demonstrate the effect of different system parameters on the system performance. © 1983-2012 IEEE.
Sharma R.,Netaji Subhas Institute of Technology |
Rana K.P.S.,Netaji Subhas Institute of Technology |
Kumar V.,Netaji Subhas Institute of Technology
Expert Systems with Applications | Year: 2014
A two-link robotic manipulator is a Multi-Input Multi-Output (MIMO), highly nonlinear and coupled system. Therefore, designing an efficient controller for this system is a challenging task for the control engineers. In this paper, the Fractional Order Fuzzy Proportional-Integral-Derivative (FOFPID) controller for a two-link planar rigid robotic manipulator for trajectory tracking problem is investigated. Robustness testing of FOFPID controller for model uncertainties, disturbance rejection and noise suppression is also investigated. To study the effectiveness of FOFPID controller, its performance is compared with other three controllers namely Fuzzy PID (FPID), Fractional Order PID (FOPID) and conventional PID. For tuning of parameters of all the controllers, Cuckoo Search Algorithm (CSA) optimization technique was used. Two performance indices namely Integral of Absolute Error (IAE) and Integral of Absolute Change in Controller Output (IACCO) having equal weightage for both the links are considered for minimization. Numerical simulation results clearly indicate the superiority of FOFPID controller over the other controllers for trajectory tracking, model uncertainties, disturbance rejection and noise suppression. © 2014 Elsevier Ltd. All rights reserved.
Agarwal V.,Netaji Subhas Institute of Technology
International Journal of Advanced Manufacturing Technology | Year: 2012
The solution of inverse kinematics and trajectory planning with performance criteria for a redundant manipulator is proposed with modification in fuzzy c-means. A new fuzzy clustering model based on a new generalized validity index based on weighted within-scatter metrics and betweencluster scatter metrics for the manipulator is proposed. In order to understand the proposed algorithm and to show its performance, two simulation studies of trajectory planning with manipulability criteria for a redundant manipulator are modeled to solve the problems of finding association rules in the data and of setting up an appropriate classification procedures. The problem of redundant manipulator (which is a multi-input, multi-output nonlinear system) is new in terms of solution by clustering method. The proposed algorithm for the trajectory planning of the manipulator is simulated using Matlab®. All practical steps, from data acquisition to model validation, are illustrated using a 4 degree of freedom robot manipulator. The simulated results are compared with the numerical methods of the trajectory planning. The results are presented graphically. The proposed method has the advantage of simplicity, flexibility, and good tracking performance. © Springer-Verlag London Limited 2011.
Gupta V.,Netaji Subhas Institute of Technology
Complex Analysis and Operator Theory | Year: 2013
In this paper, in order to make the convergence faster to a function being approximated, we modify the Bernstein-Durrmeyer type operators, which were introduced in Abel et al. (Nonlinear Anal Ser A Theory Methods Appl 68(11):3372-3381, 2008). The modified operators reproduce the constant and linear functions. The operators discussed here are different from the other modifications of Bernstein type operators. The Voronovskaja type asymptotic formula with quantitative estimate for a new type of complex Durrmeyer polynomials, attached to analytic functions in compact disks is obtained. Here, we put in evidence the overconvergence phenomenon for this kind of Durrmeyer polynomials, namely the extensions of approximation properties with exact quantitative estimates, from the real interval [0, 1/3] to compact disks in the complex plane. © 2011 Springer Basel AG.