%Certificate
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This is to certify that the thesis entitled, "Investigations and Recent Trends in Cognitive Systems" submitted by Mr. SATVIR SINGH, for the award of the degree of Doctor of Philosophy in Electronics \& Communication Engineering to the Maharshi Dayanand University, Rohtak (India) is a record of bonafide research work carried out by him under our guidance and supervision.

The results presented in this thesis have not been submitted to any other University for the award of any other degree or diploma.

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\textbf{Prof. Arun Khosla, Ph.D.}   &   \textbf{Prof. J. S. Saini, Ph.D.}\\
\textit{Assistant Professor, ECE}   &   \textit{Professor \& Chairman, EE}\\
%Department of ECE                  &   Department of EE \& BME\\
National Institute Technology       &   DCR University of Sc. \& Tech.\\
Jalandhar (PB) INDIA                &   Murthal, Sonipat (HR) INDIA\\
\textbf{(Supervisor)}               &   \textbf{(Supervisor)}\\

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%\multicolumn{2}{c}{\bfseries Prof.}\\
%\multicolumn{2}{c}{\textit Dean}\\
%\multicolumn{2}{c}{University College}\\
%\multicolumn{2}{c}{Maharishi Dayanand University}\\
%\multicolumn{2}{c}{Rohtak, Haryana, INDIA}\\

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