Hemalatha G.,KSRMCE |
Anuradha B.,SVUCE |
Adinarayana Reddy V.,GPREC
International Journal of Applied Engineering Research | Year: 2015
The primary goal of this work is to introduce temporal artifact detection strategy to detect non responsive channels and trials in evoked potentials by tracing out the signals with very low energy and to remove artifacts in multichannel evoked potentials. The non responsive channels and trials are identified by calculating the energy of the average evoked potential of each channel, and the energy of the average evoked potential of each trial. Then channel wise and trial wise median test is conducted to detect and remove non-responsive channels and trials. An artifact is defined as any signal that may lead to inaccurate classifier parameter estimation. Temporal domain artifact detection tests include: a standard deviation (STD) test that can detect signals with little or abnormal variations in each channel, a clipping (CL) test detect amplitude clipped EPs in each channel, a kurtosis (KU) test to detect unusual signals that are not identified by STD and CL tests, mode deviation test to detect the signals with large mode deviation and correlation test to detect the signals with less correlation. An attempt has been made to apply these techniques to 14-channel visual evoked potentials (VEPs) obtained from different subjects. © Research India Publications.
Venkatanarayana M.,KSRMCE |
Jayachandra Prasad T.,RGMCET
ARPN Journal of Engineering and Applied Sciences | Year: 2012
The concept of cepstrum thresholding (CT) is applied to estimate smoothed nonparametric spectrum. The CT method is applied to Mesosphere, Stratosphere and Troposphere (MST) radar data for spectral cleaning. This method is not superior as compared with the conventional Periodogram method. So, to enhance the spectral visibility in Doppler Profile (DP), the CT technique is modified. The modified cepstrum (MC) is developed and implemented, to validate, it is applied to radar data. An adaptive spectral moment's estimation technique is utilized for analyzing the Doppler spectra of the MST radar signals. From the Doppler frequency components, the radial velocities in the direction of the zonal (U), meridional (V), and vertical (W) are estimated. In turn, the wind velocity is estimated from U and V components. The proposed method works well even at higher altitudes and results are compared with the traditional methods such as Peak detection technique and the matched filter. © 2006-2012 Asian Research Publishing Network (ARPN).
Reddy C.M.,VITS |
Reddy B.R.B.,KSRMCE |
Reddy E.K.,JNTUA |
2011 International Conference on Nanoscience, Technology and Societal Implications, NSTSI11 | Year: 2011
Biomaterials engineered at the nano level play a significant role in human health care, in particular bone - related therapy, because of their unique functional properties. In this work we explained bone grafting, bone healing, Preparation of hydoxy apatite (HA) and finite element model for bone grafting and simulation. Finite Element Model (FEM) is useful for surgery and reduces failures. The main aim of this study is to provide a patient specific model where the surgical gestures were considered and to evaluate its relevance as a predictive tool. © 2011 IEEE.