Wonjun Lee is a Ph.D. student in the Department of Robotics Engineering at Daegu Gyeongbuk Institute of Science and Technology. He received his B.S. degree from Eulji University in 2013 and M.S. degree from Daegu Gyeongbuk Institute of Science and Technology in 2015. His doctoral research focuses the piezoelectric micromachined ultrasonic transducer (pMUT) design and fabrication for cell stimulation.