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Sannappa J.,Kuvempu University | Ningappa C.,Vidya Vikas Institute of Engineering and Technology
Radiation Protection Dosimetry

An extensive studies on the indoor activity concentrations of thoron, radon and their progeny in the granite region in the state of Karnataka, India, has been carried out since, 2007 in the scope of a lung cancer epidemiological study using solid-state nuclear track detector-based double-chamber dosemeters (LR-115, type II plastic track detector). Seventy-four dwellings of different types were selected for the measurement. The dosemeters containing SSNTD detectors were fixed 2 m above the floor. After an exposure time of 3 months (90 d), films were etched to reveal tracks. From the track density, the concentrations of radon and thoron were evaluated. The value of the indoor concentration of thoron and radon in the study area varies from 16 to 170 Bq m-3 and 18 to 300 Bq m-3 with medians of 66 and 82.3 Bq m-3, respectively, and that of their progeny varies from 1.8 to 24 mWL with a median of 3.6 mWL and 1.6 to 19.6 mWL, respectively. The concentrations of indoor thoron, radon and their progeny and their equivalent effective doses are discussed. © The Author 2013. Published by Oxford University Press. All rights reserved. Source

Anjum N.,Vidya Vikas Institute of Engineering and Technology | Suresha B.,Indian National Institute of Engineering
Advances in Tribology

The mechanical properties and dry sliding wear behaviour of glass fabric reinforced epoxy (G-E) composite with varying weight percentage of silicon dioxide (SiO2) filler have been studied in the present work. The influence of sliding distance, velocity, and applied normal load on dry sliding wear behaviour has been considered using Taguchi's L9 orthogonal array. Addition of SiO2 increased the density, hardness, flexural, and impact strengths of G-E composite. Results of dry sliding wear tests showed increasing wear volume with increase in sliding distance, load, and sliding velocity for G-E and SiO2 filled G-E composites. Taguchi's results indicate that the sliding distance played a significant role followed by applied load, sliding velocity, and SiO2 loading. Scanning electron micrographs of the worn surfaces of composite samples at different test parameters show smooth surface, microploughing, and fine grooves under low load and velocity. However, severe damage of matrix with debonding and fiber breakage was seen at high load and velocity especially in unfilled G-E composite. © 2013 Naveed Anjum et al. Source

Suma,Vidya Vikas Institute of Engineering and Technology
International Journal of Electrical and Computer Engineering

Compressing the medical images is one of the challenging areas in healthcare industry which calls for an effective design of the compression algorithms. The conventional compression algorithms used on medical images doesn't offer enhanced computational capabilities with respect to faster processing speed and is more dependent on hardware resources. The present paper has identified the potential usage of Vedic mathematics in the form of Urdhava Tiryakbhyam sutra, which can be used for designing an efficient multiplier that can be used for enhancing the capabilities of the existing processor to generate enhance compression experience. The design of the proposed system is discussed with respect to 5 significant algorithms and the outcome of the proposed study was testified with heterogeneous samples of medical image to find that proposed system offers approximately 57% of the reduction in size without any significant loss of data. Copyright © 2016 Institute of Advanced Engineering and Science. All rights reserved. Source

Sannappa J.,University of Mysore | Ningappa C.,Vidya Vikas Institute of Engineering and Technology | Narasimha K.N.P.,Manasagangothri
Indian Journal of Pure and Applied Physics

The activities of 226Ra, 232Th and 40K and natural radiation levels have been measured at granite regions of Karnataka State, India using HPGe detector and scintillometer. In granite region 232Th activity is high compared to 226Ra. The data shows that the activities of 226Ra, 232Th and 40K and ambient y-radiation level were found to be high in comparison to global and Indian average1. Source

Vijay G.S.,Manipal University India | Pai S.P.,Nmam Institute Of Technology | Sriram N.S.,Vidya Vikas Institute of Engineering and Technology | Rao R.B.K.N.,COMADEM International
Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology

This article uses the cluster dependent weighted fuzzy C-means based radial basis function neural network for comparing the different dimensionality reduction techniques for the fault diagnosis in the rolling element bearing. The vibration signals from normal bearing, bearing with defect on the inner race, and bearing with defect on the outer race were acquired under one radial load and two shaft speeds. These signals were subjected to the wavelet transform based denoising from which several time and frequency domain features were extracted. Dimensionality reduction techniques, namely, principal component analysis, Fisher's criterion, and separation index, have been used to select the sensitive features. The selected features were used to train and test the radial basis function neural network, where the centers of the radial basis function units have been optimized by the cluster dependent weighted fuzzy C-means and the widths of the radial basis function units have been fixed by trial and error. Finally, a comparison of the dimensionality reduction techniques based on the radial basis function neural network performance is presented. © IMechE 2012. Source

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