Changhoon Yoon is a PhD student at KAIST (School of Computing) in South Korea. He is working with Dr. Seungwon Shin at Network and System Security Laboratory, and his research interests primarily lie in the area of network security including Software-Defined Networking (SDN) and Network Function Virtualization (NFV) security. He is currently leading Security-Mode ONOS project, which is a collaborative project with the researchers from ON.LAB and SRI International to design and implement a security extension for ONOS, and he is also participating in other SDN security projects, such as SDN WAN security project and etc. In addition, he has presented "Security-Mode ONOS" at ONS 2016, and he published several research papers on SDN security at a major journal and a workshop.