On September 1st, the retirement ceremony of Professor Sang Ken Kauh of the Department of Mechanical Engineering was held. After entering the Department of Mechanical Engineering at Seoul National University in 1973, Professor Sang-Ken Kauh went through master's and doctoral programs at the university, and served as a professor starting from 1989. Professor Sang-Ken Kauh had designed various sensors, embedded systems, wireless measurement, and flow measurement systems. For example, a patterning system for drawing liquid metal circuits curved surfaces wase of the core technologies for manufacturing flexible wearable devices that are currently in the spotlight, allowing electronic circuits to be manufactured according to the appearance of our human body. Professor Sang Ken Kauh will continue work as an emeritus professor at Seoul National University.