He is ICT Endowed Chair Professor at School of Electrical Engineering, KAIST. He did his BS and MS in Dept. of Computer Science, Seoul National University, Seoul, Korea in 1990 and 1992, respectively. He received his Ph. D in Computer Science from University of Minnesota in 1997. He worked for Intel Corp. as Server Performance Analyst till 1999. From 1999 till 2019, he was with Dept. of Computer Science, Hanyang University, Seoul, Korea. He was a dept. head and a director of Center for File and Storage Systems Technology (CFSR) at Hanyang University. He moved to KAIST after 20 years of tenure at Hanyang University. He was awarded a number of prestigious and highly selective government grants including National Research Lab grant (2007 – 2012) and  Basic Research Lab grant ( 2017 – 2020). He was a PI of a number of nation wide government funded project consortium including “Developing high performance SSD controller” (2010-2015, consortium of five universities and three companies, KEIT) and “Developing the OS technologies for large scale NVRAM”(2012 – 2017, consortium of five universities and four companies, KEIT).

He was awarded “Outstanding Researcher Award”, Hanyang University(2016) and “Gaheon Outstanding Research Award” from Korean Institute of Information Scientists and Engineers (KIISE)(2017). Funded by Samsung Electronics, he developed Namsan Filesystem. With Namsan Filesystem, he was awarded  “Best Academy-Industry Collaboration Practice in Samsung Electronics” in 2006. Namsan Filesystem was deployed in the commercial TV products. His work on IO stack optimization in Android platform identified the root cause of the IO inefficiencies in the Android smartphones (USENIX ATC 2013, best paper award). His work on IO stack design on the Flash Storage proposes a new way of designing the filesystem, block layer and device formware for the Flash storage (USENIX FAST 2018, best paper award).

He is known for his work on the Android IO stack optimization, filesystem and block layer design for SSD and NVRAM. His research interests include Operating System, Distributed System, Storage System and Software support for byte-addressable NVRAM.

Activities

  • General Chair, ACM SOSP 2025
  • Technical Committee, IEEE Consumer Technology Society, 2020-2022
  • Program Committee, ACM SYSTOR 2022,2023,2024
  • Program Committee, USENIX FAST 2015,2018,2019,2020,2021,2022,2023, 2024(Program Chair)
  • Program Committee, USENIX ATC 2018,2019,2020 (ERC),2021,2022,2023, 2025
  • Program Committee, USENIX HotStorage 2010,2011,2012,2017,2019,2020,2021(PC Chair),2023,2024,2025
  • Program Committee, IEEE NVMSA 2018,2019
  • Program Committee, IEEE MSST 2012,2014,2019,2024
  • Program Committee, ACM SDDCS 2017,2018
  • Program Committee, ACM LCTES 2017
  • Program Committee, USENIX INFLOWS 2016
  • Program Committee, Workshop on Software-Defined Data Communications and Storage (SDDCS) in conjunction with IEEE ICDCS 2016
  • General Chair, IEEE NVMSA 2016
  • Program Committee, ACM APSYS 2015
  • Workshop Chair, KIISE NVRAMOS 2008,2009,2010,2011,2012,2013
  • Program Committee, IEEE ICPADS 2012, Singapore
  • Program Committee, IEEE SNAPI 2011, 7th IEEE International Workshop on Storage Network Architecture and Parallel I/Os, 2011
  • Asia Liason, International Conference on Distributed Computing Systems(IEEE ICDCS 2011)
  • Program Committee, IEEE HPCA 2010 Workshop on the Use of Emerging Storage and Memory Technologies, Bangalore, India
  • Program Committee, IASTED International Conference on Internet and Multimedia Systems and Applications 2007,2008,2009,2010,2011
  • Program Committee, Third Workshop on Ad-Hoc Wireless Networks (WAHOC’09; www.wahoc.imcsit.org), 2009
  • Program Committee, International Workshop on Software Support forPortable Storage 2009 (IWSSP 2009), 2009
  • Program Committee, Workshop on Data Storage Devices and Systems (DS2), Korea 2009
  • Program Committee, IASTED International Conference on Wireless and Optical Communications (WOC 2009),  2009.
  • Program Committee, Pacific Rim Conference on Multimedia(PCM 2007)
  • Program Committee, The 11th IASTED International Conference on Artificial Intelligence and Soft Computing(ASC 2007), August 29 – 31, 2007
  • Workshop Chair, International Workshop on Internet Traffic Measurement, Modeling and Analysis, Jan. 2005 (co-*organized with Walter Willinger at AT&T and Don Towsley at UMASS Amherst)
  • Program Committee, Pacific Area Workshop on Knowledge Discovery and Data Mining 2003 (PAKDD ’03)
  • Workshop Chair, International Workshop on Data Mining for Actionable Knowledge 2003, May 2003(DMAK ’03)
  • 제39대 정보과학회 회장, 2024.1.1 – 2024.12.31
  • 정보과학회 수석부회장, 2023,1,1 – 2023.12.31
  • 정보과학회 스토리지 연구회 운영위원장, 2019.3.1 – 2021.2.28
  • KCC 2018 대회장, 2018.6.21 – 6.23
  • 정보과학회 지회장, 2018.3.1 – 2019.2.28
  • KCC 2016 프로그램 위원장, 2016
  • 정보과학회 분과발전위원회 위원, 2015.3.1 – 2016.2.29
  • 정보과학회 SW정책위정원회 위원, 2015.3.1 – 2016.2.29
  • 정보과학회 이사, 2015.3.1 – 2016.2.28, 2019.3.1 – 2020.2.28
  • 정보과학회 부회장(정책담당), 2013.3 – 2015.2
  • 정보과학회 컴퓨터 시스템 연구회 운영위원장, 2014.3 – 2016.2
  • 정보과학회 SW정책연구회 운영위원장, 2014.3 – 2015.2
  • 산업기술평가관리원, 외부평가위원원, 2013.3 – 2014.2
  • 정보과학회 부회장, 2012.3 – 2013.2, 2013.2 – 2014.2, 2016.3.1 – 2017.2.28, 2018.3.1 – 2018.2.28

Honors

  • Best Paper Award, USENIX FAST 2018
  • Gaheon Outstanding Researcher Award, KIISE, Dec 2016
  • Outstanding Research Achievement Award, Hanyang University, August, 2014
  • Best Paper Award, USENIX ATC, 2013
  • Department Fellowship, Dept. of Computer Science, University of Minnesota, 1995
  • Government Overseas Fellowship(Computer Science major, Ministry of Education, 1992- 1995)

Professional Experience

  • 2019.3 – present: Professor, School of Electrical Engineering, KAIST, Daejon, Korea
  • 1999.3 – 2019.2: Professor, Division of Electrical and Computer Engineering, Hanyang University
  • July 2002 – Aug. 2002: visiting scholar(adjunct research associate), Computer Science Dept, University of Minnesota
  • 1997 – 1999: Server Performance Analyst, Intel Corp.
  • 1992 – 1997: Research Assistant, Computer Science Dept., University of Minnesota