His research interests are power management circuits and systems, switch mode power converters, switched-capacitor power converters, low dropout regulators, bandgap references, micro-power energy harvesting circuits, RFID and micro-sensor circuits, and fundamental research in analog integrated circuit analysis and design.
Ki is serving on the International Technical Program Committee (ITPC) of the IEEE International Solid-State Circuit Conference (ISSCC, known as Chip Olympiad) since 2009; and served as an Associate Editor of the IEEE Transactions on Circuits and Systems II: Express Briefs (2004-2005). He was the recipient of the Asia Innovator Award (1998) granted by EDN Asia; the Outstanding Design Award (2004) and the Special Feature Award (2006) of the LSI University Design Contest organized by the Asia and South Pacific Design Automation Conference; the Best Paper Award of the IEEE International Symposium on Low Power Electronic Devices (2007) and the IEEE International Symposium on Integrated Circuits (2009); and the Student Paper Contest (First Prize) of the IEEE Int'l. Symp. on Circ. and Syst., (2011).