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Vyas K.,Bhagwant University | Sharma A.K.,Global Institute of Technology | Singhal P.K.,Madhav Institute of Technology and science
Progress In Electromagnetics Research C | Year: 2014

In this paper, two novel coplanar waveguide (CPW) fed printed ultra wide band (UWB) monopole antennas with dual band-notching characteristics are proposed. The modified ground technique with symmetric ground plane in antenna 1 and asymmetric ground planes in antenna-2 is exploited to cover UWB application. Both antennas are compact with dimensions of 30×30×1:6mm3 and have dual band-notched characteristics with first notched band for integrated band of WiMax 3.5/5.5 GHz and C-band satellite communications 3.7-4.2 GHz and second notched band for WLAN 5.2/5.8 GHz bands. Antenna with symmetric ground plane achieves the impedance bandwidth of 2.9-11.5 GHz, and antenna with asymmetric ground plane achieves the impedance bandwidth of 2.9- 11.89 GHz, respectively with VSWR < 2 except in the notched bands. The antennas are designed and optimized in CST Microwave Studio. The simulated VSWR of the proposed antenna designs is compared with the measured VSWR of fabricated antennas, and it is found that they are in a good agreement. Both antennas exhibit monopole-like radiation patterns with significant gain in entire operating band. Maximum gain of the proposed antenna with symmetric ground plane is 5.3 dBi at 8 GHz, and that with asymmetric ground plane is 4.5 dBi at 7 GHz.

Saxena M.,Poornima University | Bannett O.O.,Global Institute of Technology | Sharma V.,Poornima University | Sharma V.,Global Institute of Technology
Procedia Engineering | Year: 2016

In this work the two disciplines of condition based maintenance (CBM), structural health monitoring (SHM) and prognostics are described fault identification and estimation is an important and necessary step in condition based maintenance. In the present work, an experiment is carried out with a customized test setup where the seeded defects are introduced in the inner race and outer race of a radial ball bearing. The relationship between the acquired vibration data and their relation with the seeded defect is found in this paper. When experiment is performed on the test setup designed for Fault prediction, Analytical Wavelet Transform proved an effective tool for the analysis of vibration signal. In this work, AWT followed by the Power Spectral Density is implemented on vibration signals of a defective Radial Ball Bearing. After finding the fault, its location and its intensity Ball Bearing's remaining useful life is estimated. © 2016 The Authors.

Agrawal A.,Infosys | Bindra G.S.,SRM University | Sharma P.,Global Institute of Technology
2012 6th International Conference on Application of Information and Communication Technologies, AICT 2012 - Proceedings | Year: 2012

In this paper a novel and simple iris feature extraction technique is proposed for iris recognition of high performance. We use one dimensional circular ring to represent iris features. The reduced and significant features afterward are extracted by Sobel Operator and 1-D wavelet transform. To improve the accuracy, this paper combines uses Euclidean Distance for classification. © 2012 IEEE.

Bindra G.S.,Columbia University | Agrawal A.,Infosys | Sharma P.,Global Institute of Technology
Proceedings of the 2012 International Conference on System Engineering and Technology, ICSET 2012 | Year: 2012

In this paper a novel and simple iris feature extraction technique is proposed for iris recognition of high performance. We use one dimensional circular ring to represent iris features. The reduced and significant features afterward are extracted by Sobel Operator and 1-D wavelet transform. To improve the accuracy, this paper combines uses Euclidean Distance for classification. © 2012 IEEE.

Singh P.,Global Institute of Technology | Pant M.,Indian Institute of Technology Roorkee
Advances in Intelligent Systems and Computing | Year: 2014

Shell and tube heat exchangers (STHE) are the most common type of heat exchangers widely used in various kinds of industrial applications. Cost minimization of these heat exchangers is of prime concern for designers as well as for users. Heat exchanger design involves processes such as selection of geometric and operating parameters. Generally, different exchangers geometries are rated to identify those that satisfy a given heat duty and a set of geometric and operational constraints. In the present study we have considered minimization of total annual cost as an objective function. The different variables used include shell internal diameter, outer tube diameter and baffle spacing for which two tube layout viz. triangle and square are considered. The optimization tool used is differential evolution (DE) algorithm, a nontraditional stochastic optimization technique. Numerical results indicate that, DE can be used effectively for dealing with such types of problems. © Springer India 2014.

Khichar R.,Global Institute of Technology | Upadhyay S.S.,Global Institute of Technology
Applied Geomatics | Year: 2010

We are at a time of transition in the fields of planetary geodesy, mapping, and imaging. Planetary exploration has moved from a time of initial reconnaissance of the solar system using mostly planetary flyby missions and images exclusively from framing cameras to much more extensive missions of targeted exploration using orbiting spacecraft, linescanner cameras, laser altimeters, and other sensors. It is appropriate to review the past history of this effort, recent advances in this area, and the current state of the art in both planetary and terrestrial geodesy, mapping, planetary imaging and surveillance, and reference systems. A wireless sensor network is a network consisting of small sensing devices spatially distributed using sensors to cooperatively monitor various conditions (Römer and Mattern, IEEE Wireless Comm 11(6):54-61, 2004; Thomas Haenselmann, Sensornetworks, GFDL Wireless Sensor Network textbook, http://www. informatik.uni-mannheim.de/∼haensel/sn-book, 2006). So far, over 100 physical (light, pressure, humidity, etc.), chemical (gas, liquid, solid, etc.), and biological (DNA, protein, acoustics, etc.) properties can be sensed by using in situ sensing technology. With the presence of cheaper, miniature, faster, and smart in situ sensors, the increasing availability of abundant ubiquitous computing devices, wireless and mobile network access, and autonomous and intelligent geospatial software agents, distributed networked. © The Author(s) 2010.

Bhoopal R.S.,University of Rajasthan | Sharma P.K.,University of Rajasthan | Kumar S.,University of Rajasthan | Pandey A.,Global Institute of Technology | And 2 more authors.
Special Topics and Reviews in Porous Media | Year: 2012

The effective thermal conductivity (ETC) of polymer composites is studied using artificial neural networks. Artificial neural networks are a form of artificial intelligence, which attempt to mimic the function of the human brain and nervous system. Artificial neural networks provide a great deal of promise but they suffer from a number of shortcomings, such as knowledge extraction, extrapolation, and uncertainty. This paper presents the use of the artificial neural network for prediction of ETC of metal-filled polymer composites due to their increasing importance in many fields of engineering applications and technological developments. Artificial neural networks models are based on a radial basis with the training function: the more efficient design radial basis network (NEWRB) and the feedforward backpropagation network with training functions conjugate gradient with Powell-Beale restarts, Levenberg-Marquardt, one-step secant, random order incremental, and resilient backpropagation. The volume fraction and thermal conductivity of continuous (matrix) and dispersed (filler) phases are input parameters to predict the ETC. The resultant predictions of ETC using the different models of artificial neural networks agree well with the available experimental data. © 2012 by Begell House, Inc.

Grover J.,Global Institute of Technology | Laxmi V.,Malaviya National Institute of Technology, Jaipur | Gaur M.S.,Malaviya National Institute of Technology, Jaipur
International Journal of Security and Networks | Year: 2014

In vehicular ad hoc networks (VANETs), vehicles are enabled to exchange information to detect and mitigate critical situations. VANETs are vulnerable to many security threats. One severe attack is Sybil attack, in which a malicious node forges large number of fake identities in order to disrupt the proper functioning of VANET applications. Fake information reported by a single malicious vehicle may not be highly convincing because most of the VANET applications require several vehicles to reinforce a particular information before accepting as a truth. A Sybil attacker pretends multiple vehicles in order to reinforce false messages. Proposed methodology exploits the characteristics of Sybil nodes as the neighbours of fake identities (originated from a malicious node) share significant common neighbouring nodes. Motivation behind the design of proposed approach is to locate Sybil nodes quickly without using secret information exchange and special hardware support. We evaluate our proposed approach on the realistic traffic scenario. Copyright © 2014 Inderscience Enterprises Ltd.

Soni A.,Global Institute of Technology | Gupta V.,Malaviya National Institute of Technology, Jaipur | Arora C.M.,Malaviya National Institute of Technology, Jaipur | Dashora A.,University of Rajasthan | Ahuja B.L.,University of Rajasthan
Solar Energy | Year: 2010

We report energy bands, density of states and optical properties of CuGaS2 and CuInS2 chalcopyrites. The electronic structure has been computed using linear combination of atomic orbitals (LCAO) scheme within density functional theory (DFT) and full-potential linearised augmented plane wave method. The energy bands, density of states, components of dielectric tensors and absorption coefficients are compared with the available data. It is seen that the present LCAO-DFT calculations reproduce the electronic properties of both the chalcopyrites in a reasonable way. The optical properties show more absorption of solar radiations for CuGaS2 chalcopyrite, depicting its more usefulness in the solar cells. © 2010 Elsevier Ltd.

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