▶ Job experiences 2015. 7. ~ present: Founder and CEO, hyBee Inc., Korea 2020. 9. ~ present: Emeritus Professor, Seoul National University, Korea 1994. 3. ~ 2020. 8: Professor, School of Electrical Eng., Seoul National University, Korea 2001. 3. ~ 2013. 2: A board member, KCTech Inc., Korea 1997. 3. ~ 2003. 2: Senior Technical Advisor (acting manager of Nokia Seoul R&D center), Nokia Inc. 1988. 4. ~ 1994. 2: Principal Eng., Motorola Inc., USA 1980. 3. ~ 1985. 2: Senior research engineer, Korea Agency for Defense Development (ADD) ▶ Commercial system development experiences ZigBee and BLE compatible HB2200 and HB1200 SoC (2016-2020) for hyBee WiBro (m-WiMax) baseband modem (2008) for GCT GMR modem of Hugh Networks (2005) for AP Systems WCDMA transceiver (2000~2002) for Nokia and Samsung V.32, V.33, V.34 and 56K voice-band modems (1988~1994) for Motorola ▶ Educational experiences 1988. 5: Ph.D., Dept. of Electrical and Computer Eng., Univ. of Massachusetts, USA 1980. 2: MS, Dept. of Electrical Eng., KAIST, Korea 1977. 2: BS, Dept. of Electrical Eng., Seoul National Univ., Korea ▶ R&D records 451 papers published in Journals and Conferences 132 patents registered to Korea and USA PTO