\setlength{\topmargin}{0.4cm}
\setlength{\headheight}{0cm}
\setlength{\headsep}{0cm}
\setlength{\textheight}{23.6cm}
\setlength{\oddsidemargin}{-0.54cm}
\setlength{\evensidemargin}{-0.54cm}
\setlength{\columnsep}{0.7cm}
\setlength{\textwidth}{17.0cm}

\newlength{\abstractwidth}
\setlength{\abstractwidth}{15cm}

\renewcommand{\baselinestretch}{0.9}

\pagestyle{empty}
\thispagestyle{empty}

\def\@maketitle{\newpage
\begin{center}
%\centering
	{\LARGE\bf\@title\par}%
	\vskip 0.5em%
	{\Large\bf\@etitle\par}%
	\vskip 1.5em%
	{\large\begin{tabular}[t]{c}\@author\end{tabular}\par}%
	\vskip 1.5em%
	{\large\@affiliation\par}%
	\vskip 1.5em%
	\@abstract\par%
	\vskip 1.5em
\end{center}}
%}
\long\def\abstract#1{\long\gdef\@abstract{\parbox{\abstractwidth}{{\bf Abstract:} #1}}}
\long\def\etitle#1{\long\gdef\@etitle{#1}}
\long\def\affiliation#1{\long\gdef\@affiliation{#1}}

\newcommand{\afil}[1]{\textsuperscript{#1}}



\twocolumn
