L I F U L L C o . , L t d . A l l R i g h t s R e s e r v e d . "! • :, ,&, `, ,W: 6YO # F?XMI/ UI, H11 <(2!*%3[8, pp. 183–189 (2016) • 'P, ^B, 0N, $N: Twitter L9 KR @ TQ1 VA, NII IDR 2016 http://www.nii.ac.jp/dsc/idr/userforum/poster/IDR-UF2016 P10.pdf • ,N, :, 0., E_: ;D!7\Z ]4" 5>)/, =+JS!C-G OS-15TQ1 AI(2017)