備忘録：subcaptionサイトで既に言及あり．
Q: Is it possible to get IEEEtran to work with the subcaption package?
The problem is that there does not seem to be a way to prevent subcaption from taking control of the main caption formatting away from IEEEtran like the caption=false option does under subfig.sty. IEEEtran has to format captions differently depending on its mode. An admittedly crude hack that might work is simply to restore IEEEtran's definition of @makecaption:
\makeatletter
\let\MYcaption\@makecaption
\makeatother
\usepackage[font=footnotesize]{subcaption}
\makeatletter
\let\@makecaption\MYcaption
\makeatother
\usepackage{subcaption}
それで例えばこうする．
\begin{figure*}[!p]
\begin{minipage}[b]{0.5\linewidth}
\centering
\includegraphics[width=2.5in]{box}%
\subcaption{Case I}\label{fig_first_case}%
\end{minipage}%
\hfil
\begin{minipage}[b]{0.5\linewidth}
\centering
\includegraphics[width=2.5in]{box}%
\subcaption{Case II}\label{fig_second_case}%
\end{minipage}%
\caption{Simulation results for the network.}
\label{fig_sim}
\end{figure*}