The portable projection system design based on light emitting diode using secondary colors. - Oh-Jin Kwon; Yongseok Chi; Youngseop Kim; Hack Youp Noh (ICCE, 2013)

A Multiple Optical Vision System of Virtual Display. - Yongseok Chi (ICISA, 2018)

Unique Cipher-Acoustic Languages for Human-Robot Interactions. - Irvin Steve Cardenas; HyunJae Jeong; Jong-Hoon Kim; Yongseok Chi (HRI, 2019)