Acknowledgments
We thank the Principal and Director of Siddaganga Institute of Technology, Tumakuru, Karnataka, for the research facilities. One of the authors (HSL) is thankful to the Vision Group of Science and Technology, Department of Information Technology, Biotechnology and Science & Technology, Government of Karnataka, for providing funds under the CISEE Programme (GRD No. 472) to carry out the present research work by means of a sponsored project.