Visual Emphasis of Lip Protrusion for Pronunciation Learning 論文 Siyang YU・Kazuaki KONDO・Yuichi NAKAMURA・Takayuki NAKAJIMA・Hiroaki NANJO・Masatake DANTSUJI ·2019 ·『IEICE Transactions on Information and Systems』 E102.D(1) pp. 156-164 doi:10.1587/transinf.2017EDP7411