The previewable switch: a light switch with feedforward. - Richard Chulwoo Park; Hyunjae Lee; Hwan Kim; Woohun Lee (Conference on Designing Interactive Systems, 2014)

Hapcube: a tactile actuator providing tangential and normal pseudo-force feedback on a fingertip. - Hwan Kim; Hyeon-Beom Yi; Richard Chulwoo Park; Woohun Lee (SIGGRAPH Emerging Technologies, 2018)

Defining basic archetypes of an intelligent agent's behaviour in an open-ended interactive environment. - Richard Chulwoo Park; Donghyeon Ko; Hyunjung Kim; Seung Hyeon Han; Jee Bin Lim; Jiseong Goo; Geehyuk Lee; Woohun Lee (Digit. Creativity, 2020)