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Articles by John Bosco Balaguru Rayappan
Total Records ( 7 ) for John Bosco Balaguru Rayappan
  Rengarajan Amirtharajan and John Bosco Balaguru Rayappan
  Information technologies and communications have pervaded our homes and business places. No matter how well-organized and extensive the communication technology is there are always loop holes in the network and people who seek after the clandestine information to extract from these loop holes. The pandemic problem of security is still a raging problem as every solution compromises on one trait to heighten the other(s) according to the necessity of the hour. In this paper we suggest an algorithm where we have tried to retain all the three important banalities of secure communication: robustness, capacity and imperceptibility by using Haar Integer wavelet transform a Discrete Wavelet Transform (DWT) domain method in tandem with a cryptic scheme i.e. the direct binary or inverted binary embedding of data. Experimental results that compute the MSE and PSNR show that this algorithm caters to the need of the hour by delivering the high capacity with good imperceptibility.
  Sundararaman Rajagopalan , Rengarajan Amirtharajan , Har Narayan Upadhyay and John Bosco Balaguru Rayappan
  Little brooks make great rivers-says a proverb. Information science involves not only the efforts made for gathering, acquiring or collecting the data that corresponds to the information but also contains the ways to save it, protect it and preserve it. The meaning of the proverb however stresses upon how to protect and secure information, as a small leakage will pave way for entire loss of information which should be protected. True, there have been various methods, approaches and algorithms proposed in the past and will emerge in future too in the areas of secure information transmission. Cryptography and steganography have been primary sources for information security. The bird’s eye view on the literature pertaining to the above mentioned two giants of information security spots a number of algorithms developed on both software as well as hardware platforms. This study does the survey from the literature on different cryptographic and image steganographic methods implemented on a reconfigurable hardware like FPGAs in the past. The analysis of various methods proposed earlier is also an important objective of this study.
  Padmapriya Praveenkumar , Rengarajan Amirtharajan , K. Thenmozhi and John Bosco Balaguru Rayappan
  Orthogonal Frequency Division Multiplexing (OFDM) has come to the rescue of the bandwidth constraint owing to the burgeoning digital multimedia applications. The serial data is made parallel and transmitted over multiple orthogonal frequencies with bandwidth of each subcarrier considerably lesser than the coherence bandwidth of the channel. This study aims to review the present state of art in Error Correcting Codes (ECC) in OFDM, generated by methods like Convolutional Encoding, using Reed-Solomon Codes and Turbo codes. Furthermore the deployment of Artificial Neural Networks (ANN), to train the system for higher fault tolerance in OFDM is detailed.
  Usha Nandini Devi , John Bosco Balaguru Rayappan and B.G. Jeyaprakash
  Nanostructured ceria/polyaniline core shell particles were synthesized via polymerization of aniline monomers with the cerium oxide nanoparticles. Cerium oxide nanoparticles were prepared by hydroxide-medicated treatment and the shell was formed by polymerization of aniline hydrochloride with ammonium peroxydisulphate. Structural and optical characteristics of the prepared nanocomposites were studied separately for cerium oxide, polyaniline and core-shell ceria-polyaniline. The UV-Vis absorption spectra of the CeO2-PANI confirmed the formation of the core-shell nanostructure. The optical properties of nanocomposites obtained from this method were analyzed as a function of preparation condition and the same has been reported.
  M. Antony , N. Lawrence and John Bosco Balaguru Rayappan
  Investigations on the hydrogenation of graphane has gained a significant momentum due to its applications in the fields of hydrogen storage, automobiles, etc. The knowledge on lattice vibrations and hence the thermal properties of hydrogenated graphene (graphane) is important in order to use this material for hydrogen storage applications. This study has reported one of the important thermal properties namely Debye-Waller factor and defect modes of graphane by computing phonon frequency modes by considering atomic interactions up to six neighbors in the frame work of Born von Karman formalism and Green’s function approach. The estimated defect modes particularly the localized vibrational modes and the values of Debye-Waller factor for a temperature range of 400 to 1300 K have been reported.
  Varadharaja Perumal Srinivasa , Durgajanani Sivalingam , Jeyaprakash Beri Gopalakrishnan and John Bosco Balaguru Rayappan
  Nanostructured copper oxide (CuO) thin films have been deposited onto thoroughly cleaned glass substrates by spray pyrolysis technique. The structural, morphological, optical and electrical properties of the CuO thin films deposited at different concentrations of precursor solution as a function of substrate temperature around 373 K were investigated using XRD, FE-SEM and electrometer respectively. The nanostructured CuO thin films showed significant response towards various concentrations of ethanol vapor and hence this material can used as an effective sensor element to detect ethanol.
  Antony Sasither Selvanayagam , Jeyaprakash Beri Gopalakrishnan and John Bosco Balaguru Rayappan
  Novel chemical sensor was fabricated by forming the thin films of conducting polyaniline on glass substrates using spin coating technique. Structural and morphological characterizations of spin coated polyaniline (PANI) thin film were carried out using X-Ray Diffractometer (XRD) and Field Emission Scanning Electron Microscope (FE-SEM), respectively. The functional group present in the polyaniline thin film was confirmed using FTIR spectrometer. Sensing performance of the prepared film was studied. The resistance of the polyaniline thin film was reduced from 109-107 ohms towards the 25 ppm concentration level of ammonia at room temperature.
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