\documentclass[10pt,twocolumn,a4paper]{article} % class notes
%\documentclass[10pt,a4paper]{article} % sometimes 
%\documentclass[11pt,a4paper]{article} % normal documents 
\usepackage{hfont,uhc}                 % for hangul
\usepackage{amsmath}                   % include following three 
\usepackage{amsfont}                   % if you want to use amstex
\usepackage{amssymb}
\usepackage{epsfig,graphicx}           % to include eps images
\usepackage{latexsym}
\usepackage{times}
%\usepackage{mathptm}                  % times new roman math font
\usepackage{mathptmx}                  % times new roman math font
\textwidth = 160mm  % 210mm (sometimes use 170mm)
\textheight = 247mm % 297mm (sometimes use 237mm)
\topmargin = -10mm  % adjust following three values to suit your PC and printer
\oddsidemargin = -5mm
\evensidemargin = -5mm
\columnsep = 8mm
%\columnseprule =   % specify when column separation line is needed  
                    % when using twocolumns

\renewcommand{\figurename}{±×¸²~}
\renewcommand{\tablename}{Ç¥~}
\renewcommand{\labelitemiii}{$\bullet$}
\renewcommand{\labelitemiv}{--}

\renewcommand{\topfraction}{0.9}       % to include large floating image
\renewcommand{\bottomfraction}{0.9}

\makeatletter
\renewcommand{\@makecaption}[2]{
\vskip\abovecaptionskip
\sbox\@tempboxa{$<$#1$>$ #2}%
\ifdim \wd\@tempboxa >\hsize
  $<$#1$>$ #2\par
\else
  \global \@minipagefalse
  \hb@xt@\hsize{\hfil\box\@tempboxa\hfil}%
\fi
\vskip\belowcaptionskip
}
\makeatother

\renewcommand{\proofname}{\textgt{Áõ¸í}}
\theoremstyle{definition}
\newtheorem{theorem}{\textgt{Á¤¸®}}
\newtheorem{lemma}{\textgt{º¸Á¶Á¤¸®}}
\newtheorem{definition}{\textgt{Á¤ÀÇ}}
\newtheorem{corollary}{\textgt{µû¸§Á¤¸®}}
\newtheorem{assumption}{\textgt{°¡Á¤}}

\begin{document}

\end{document}