\documentclass[a4paper,11pt]{jarticle}
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\begin{document}
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% 発表の題目
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\begin{center}

{\LARGE\bf 発表題目（日本語・英語可）} 

\vspace*{5mm}
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% 著者の名前と所属
% 著者が少ない場合は削除してください。
% 著者が多い場合は追加してください．
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第１著者の名前（○○大学△△学科）\\
$^\ast\!\!$
第２著者の名前
（×××大学大学院□□研究科）\\
第３著者の名前（○○大学△△学科）
\end{center}

アブストラクトの本文はここから始まります．
アブストラクトは日本語か英語で記述をお願いします．
ページ番号は入れないでください．
1ページ以内に収まるようにしてください．
ただし，文字の大きさ（11ポイント），余白や改行幅等のレイアウト
は変更しないでください．
各著者の後には所属を書いてください．
都市のORで発表を行う著者の名前には$\ast$をつけてください．
最後に，参考文献は必要に応じて書いてください． 

\begin{thebibliography}{99}

\bibitem{ref1}
A. Author, B. Coauthor, 
Title of the paper,
{\it Journal of urban Operations Research},
{\bf 52}, 1--100, 2015.

\bibitem{ref2}
瀬戸花子，南山太郎，
論文の題名，
都市のオーアール学会誌, 
{\bf 52}, 1--100, 2012.
\end{thebibliography}

\end{document}