\documentclass[a4paper, oneside, 10pt]{article}
\usepackage[unicode]{hyperref}
\usepackage[utf8x]{inputenc}
\usepackage[english]{babel}
\usepackage{graphicx}
\graphicspath{{media/}}
\date{\today}
\title{}
\author{}
\usepackage[utf8x]{inputenc}
\begin{document}



\subsection{\texorpdfstring{M.S. Students}{MS Students}}
\label{sec:ms_students}


Array
\begin{itemize}
  \item \href{http://nanophys.khu.ac.kr/doku.php?id=user:hyeondeok}{Hyeondeok Seo}

  \begin{itemize}
    \item Office: 310 West Wing, College of Sciences
    \item Phone: +82-2-961-2284
    \item Email: \href{mailto:hdseo@khu.ac.kr}{hdseo@khu.ac.kr}
  \end{itemize}
  \end{itemize}


\begin{center}
\line(1,0){250}
\end{center}



\href{http://nanophys.khu.ac.kr/doku.php?id=user:yewzzang}{\raggedright\includegraphics[keepaspectratio=true,width=0.8\textwidth]{user/yewzzang/selection_001}
}
      \begin{itemize}
  \item \href{http://nanophys.khu.ac.kr/doku.php?id=user:yewzzang}{Changhyun Yoo}

  \begin{itemize}
    \item Office: 310 West Wing, College of Sciences
    \item Phone: +82-2-961-2284
    \item Email: \href{mailto:yewzzang@naver.com}{yewzzang@naver.com}
  \end{itemize}
  \end{itemize}


\begin{center}
\line(1,0){250}
\end{center}



\href{http://nanophys.khu.ac.kr/doku.php?id=user:sunho}{\raggedright\includegraphics[keepaspectratio=true,width=0.8\textwidth]{user/sunho/selection_001}
}
      \begin{itemize}
  \item \href{http://nanophys.khu.ac.kr/doku.php?id=user:sunho}{Sunho Park}

  \begin{itemize}
    \item Office: 310 West Wing, College of Sciences
    \item Phone: +82-2-961-2284
    \item Email: \href{mailto:harambada@gmail.com}{harambada@gmail.com}
  \end{itemize}
  \end{itemize}


\begin{center}
\line(1,0){250}
\end{center}



\href{http://nanophys.khu.ac.kr/doku.php?id=user:sunho}{\raggedright\includegraphics[keepaspectratio=true,width=0.8\textwidth]{user/sunho/selection_001}
}
      \begin{itemize}
  \item \href{http://nanophys.khu.ac.kr/doku.php?id=user:sunho}{Sunho Park}

  \begin{itemize}
    \item Office: 310 West Wing, College of Sciences
    \item Phone: +82-2-961-2284
    \item Email: \href{mailto:harambada@gmail.com}{harambada@gmail.com}
  \end{itemize}
  \end{itemize}


\end{document}
