replaced overall system diagram

src/design_methodology_and_implementation.tex

@@ -21,8 +21,8 @@ This section should not include screenshots nor detailed “how-to” operations
 
 	\begin{figure}[H]
 		\centering
-		\includegraphics[scale=0.4]{graphics/simplified.eps}
-		\caption{A simplified overall system diagram.}
+		\includegraphics[scale=1]{graphics/system.png}
+		\caption{A simplified overall system illustration.}
 		\label{fig:simplified}
 	\end{figure}