Professor

Youjip Won

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.

Homepage: https://oslab.kaist.ac.kr/professor-youjip-won/

PhD Students

Changhyun Park

Changhyun Park is a PhD student at Embedded Software System Laboratory at Department of Computer Science, Hanyang University. His research interests are focused on the mathematical model of SSD.

Publications

  • 박창현, 조석희, 원유집 “리눅스상의 각 파일 시스템에서의 SSD성능 실험” 한국정보과학회 제36회 정기총회 및 추계학술발표회 (2009. 11)

Joontaek Oh

Joontaek Oh is a PhD Student at Department of Computer Science,, Hanyang University. He is a member of Embedded Software System Laboratory. His research interests are File system and Storage. He is researching the improvement of F2FS and EXT4.

Publications

  •  Youjip Won, Jaemin Jung, Gyeongyeol Choi, Joontaek Oh, Seongbae Son, Jooyoung Hwang, Sangyeun Cho “Barrier Enabled IO Stack for Flash Storage”, in proc. of USENIX Conference on File and Storage Technologies (FAST), Oakland, CA, USA, Feb. 12-15, 2018 (Awarded Best Paper)

Muhammad Danish Tehseen

Muhammad Danish Tehseen is MS leading to PhD Integrated student at Department of Electronical and Electronics Engineering. He is a member of Operating System Lab at KAIST.

Publications

Jieun Kim

Jieun Kim is a MS leading to PhD intergrated student at Department of Electrical Engineering, KAIST. She is a member of Operating system laboratory. Her research interests are computer vision and Embedded System.

Publications

Julian Troy Valdez

Julian Troy Valdez is a MS leading to PhD integrated student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interest is Linux kernel.

Publications

MS Students

Kyoungho Koo

Kyoungho Koo is MS student at Department of Computer Science, Hanyang University. He is a member of Embedded Software System Laboratory. His research interests are Micro-Controller Operation System and Visual system.

Publications

  • [IEEE NVMSA] Kyoungho Koo, Yongjun Park, Youjip Won, “LOCKED-Free Journaling: Improving the Coalescing Degree in EXT4 Journaling”, in Proc. of  IEEE Non-Volatile Memory Systems and Applications Symposium (NVMSA) 2020, Sokcho, Korea, Aug. 19-21, 2020
  • [WDCS] 구경호, 이원종, 오준택, 박영준, 원유집, “트랜잭션 블록 삽입 대기로 발생하는 저널링의 성능저하와 최적화 방안” 한국정보과학회, 2019 정보보안 및 고신뢰컴퓨팅 하계워크샵 (WDCS 2019), 2019년 8월 12 – 8월 14일, 제주대학교 아라컨벤션홀, 제주

Junhan Lee

Junhan Lee is MS student at Department of Electrical Engineering, KAIST. He is a member of Operating System Laboratory. His research interests is Linux kernel.

Publications

Dohyun Kim

Dohyun Kim is MS student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interests are File system and OS kernel.

Publications

Hojin Nam

Hojin Nam is MS student at Department of Electrical Enginnering, KAIST. He is a member of Operating System Laboratory. His research interests is memory support software.

Publications

Sion Ji

Sion Ji is MS student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interests are File system and SQLite in Android.

Publications

Jeoungahn Park

Jeoungahn Park is MS student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interests are Linux kernel and CPU scheduling.

Publications

Wonyoung Lee

Wonyoung Lee is MS student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interests are linux kernel and low power design.

Publications

Minsu Jang

Minsu Jang is MS student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interests are Android OS and system design.

Publications

Kwangwon Min

Kwangwon Min is MS student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interests are Linux Kernel and File system

Publications

 Yongjin Kim

Yongjin Kim is MS student at Department of Electrical Engineering, KAIST. He is a member of Operating System Laboratory. His research interest is OS kernel.

Publications

Undergraduate Interns

Juwon Kim

Juwon Kim is BS student at Department of Electrical Engineering, KAIST. He is a member of Operating System Laboratory. His research interest is Filesystem.

Publications

Alumni

  • 이도근
  • 황태호
  • 김형준(Kim, Hyungjun), (주)윈스, 2020
  • 김명선(Kim, Myeongseon), LG CTO, 2020
  • 이원종(Lee, Wonjong), 삼성전자, 2020
  • 김선두(Kim, Sundoo), LG CTO, 2019
  • 조정우(Jo, Jungwoo), Exem, 2019
  • 윤주성(Yun, Juseong), , 2019
  • 유진수(Yoo, Jinsoo) , 삼성전자, 2018
  • 조민재(Cho, Minjae) ,(주) 우아한형제들 , ,
  • 김선녕(Kim, Sunyoung) , , ,
  • 최경열(Choi, Gyeongyeol), TMaxSoft, 2017
  • 노연진(Noh, Yeonjin), LG CTO, 2017
  • 손성배(Son, Seongbae), HP, 2017
  • 김지현(Kim, Jihyun), , 2017
  • 이성진(Lee, Seongjin), 경상대학교, 2016
  • 천승용(Cheon, Seungyong), LG CTO, 2016
  • 손한근(Son, Hankeun ), , 2016
  • 유밝은(Yoo, Balgeun), LG CTO, 2016
  • 정재민(Jung, Jaemin), Texas A&M Univ., 2016
  • 이성수(Lee, Seongsu), LG CTO, 2016
  • Dam Quang Tuan,Vietnam National Univ, 2016
  • 이건우(Lee, Keonwoo), Future Systems, 2016
  • 임은령(Lim, Eunryoung),네이버 랩스, 2016
  • 이원건(Lee, Onegun), 삼성전자, 2016
  • 김명식(Kim, Myungsik), 삼성전자, 2016
  • 이철희(Lee, Choelhee), 아리온 테크놀로지, 2015
  • 박찬현(Park, Chanhyun), SK hynix, 2015
  • 박동일(Park, Dongil), 삼성전자, 2015
  • 임경렬(Lim, Kyeongyeol),BIGSOFT3A, 2015
  • 김준엽(Kim, Junyeop), 티맥스데이터, 2015
  • 김규일(Kim, Kyuil), LG CTO, 2014
  • 정수만(Jeong, Sooman), 삼성전자, 2014
  • 이기성(Lee, Kisung), 삼성전자, 2013
  • 신진철(Shin, Jinchul), SK Planet, 2013
  • 김재운(Kim, Jaewoon), , 2013
  • 정창훈(Jeong, Changhun),티맥스데이터, 2013
  • 조석희(Cho, Seokhei), LG CTO, 2013
  • 김종민(Gim, Jongmin),Samsung MSL, 2012
  • 김해성(Kim, Haesung), LG CTO, 2012
  • 홍성우(Hong, Sungwoo), , 2011
  • 唐 智(Tang Zhi),중국 Zhejiang시 금감원 , 2011
  • 김주현(Kim, Joohyun), 삼성전자, 2011
  • 이철목(Lee, Chulmok),삼성전자, 2011
  • 구자진(Koo, Jajin), 이오테크닉스, 2011
  • 전태종(Quan, TaiZhong),중국산업은행, 2011
  • 윤대영(Yoon, Daeyoung),교대역 소재 감리회사, 2011
  • Dashdorj Yamkhin, Mongolia Univ. of Science and Technology,2010
  • 최정헌(Choi, JeongHeon),Self-employeed, 2010
  • 이광호(Lee, Kwangho), 삼성전자, 2010
  • 어해동(Yeo, Dylan), 삼성전자,2010
  • 김요환(Kim, Yohwan), LG전자, 2009
  • 박진희(Park, Jinhee), 삼성전자, 2009
  • 최민석(Choi, Minseok), 매크로 임팩트(주), 2009
  • 신형종(Shin, Hyungjong), 삼성전자, 2008
  • 장재혁(Chang, Jaehyeok), , 2008
  • 조성호(Cho, Sungho), , 2008
  • 한석희(Han, SeokHee), , 2008
  • 민재홍(Min, Jaehong),삼성전자 ,2008
  • 반종명(Ban, Jong-Myeong), 삼성전자 , 2008
  • 전병길(Jeon, Byunggil), 삼성전자 , 2007
  • 김은기(Kim, Eunki), 삼성전자 , 2007
  • 김락기(Kim, Rak-ki), 삼성전자 , 2007
  • 김영진(Kim,Youngjin), NHN, 2007
  • 박동주(Park, Dongju), Kakao, 2007
  • 박재석(Park, Jaeseok), 삼성전자, 2007
  • 이모원(Lee, Mowon),Naver, 2007
  • 이주훤(Lee, Juhwon), (주)만도, 2007
  • 정형원(Jung, Hyungwon),삼성전자 , 2007
  • 정원민(Jung, Wonmin),LG CTO , 2007
  • 한영수(Han, Youngsoo), 삼성전자, 2006
  • 노승현(Noh, Seunghyun),(주)만도, 2006
  • 류재민(Ryu, Jaemin), 삼성전자, 2006
  • 고영준(Goh, Youngun),태민시스템, 2006
  • 이시창(Lee, Sichang), 삼성 S1, 2006
  • 한영수(Han, Youngsoo), 삼성전자, 2006
  • 방창대(Bang, Changdae), , ,
  • 강성주(Kang, Sungjoo), ETRI, 2005
  • 김재한(Kim, Jaehan), , 2005
  • 윤영성(Yun, Youngsung), 삼성전자, 2005
  • 김효준(Kim, Hyojun), Google, 2005
  • 장인광(Jang Ingwang), 삼성전자, 2005
  • 장형규(Jang, Hyeonggyu),CTRing, 2005
  • 김두한(Kim, Duhan), 삼성전자, 2004
  • 강광석(Gang, Gwangseok), 삼성전자, 2004
  • 천지원(Chen, Jiwon), 삼성전자, 2004
  • 송동현(Song, Donghyun), 삼성전자, 2004
  • 이용만(Lee, Youngman), KOTBA, 2004
  • 김진용(Kim, Jinyong), 한국전자통신연구원, 2004
  • 양승헌(Yang, Seunhyun), 넥슨코리아, 2004
  • 최정완(Choi, Jungwan), LG 전자 MC연구소, 2003
  • 송승호(Song, Seungho), 삼성전자,2003
  • 심보욱(Shim, Bouk),LG전자, 2002
  • 오창영(Oh, Changyoung), Reakosys, 2002
  • 차승일(Cha, Seungil), TG삼보컴퓨터, 2002
  • 백국실(Baek, Guksil), Nexdigm, 2002
  • 박진연(Park, Jinyeon),LG전자,2002
  • 김범은(Kim, Beopeun), 삼성전자, 2002
  • 조경선(Cho, Kyungsun), 삼성전자, 2001

Collaborators

Jongmoo Choi

Jongmoo Choi is an Associate Professor at School of Computer Science and Engineering, Dankook University, Korea. He received the BS degree in oceanography from Seoul National University, Korea, in 1993 and the MS and PhD degrees in computer engineering from Seoul National University in 1995 and 2001, respectively. His research interests include file systems, flash memory, embedded systems, and virtualization technology.

Homepage: http://embedded.dankook.ac.kr/~choijm/

Jeongseok Ha

Jeongseok Ha is currently an Associate Professor of Electrical Engineering at KAIST. He received 2003 Ph. D. in Electrical and Computer Engineering, Georgia Institute of Technology, U.S.A. His research interests include Rate-adaptive channel coding, Channel coding for storages and communication systems, Channel codes defined on graphs such as low-density-parity-check(LDPC) codes, Tornado codes, Turbo codes, Information theorical security: Wiretap channel.

Homepage: http://ccit.kaist.ac.kr/

Kangyoon Lee

Kangyoon Lee is an Associate Professor of Department of Electronics Engineering, SungKyunKwan University. He received the B.S., M.S. and Ph.D. degrees in the School of Electrical Engineering from Seoul National University, Seoul, Korea, in 1996,1998, and 2003, respectively. His research interests include implementation of CMOS RF transceiver, analog integrated circuits, and analog/digital mixed-mode VLSI system design.

Homepage: http://www.iclab.co.kr/

Jaekyun Moon

Jaekyun Moon is a Professor of Electrical Engineering at KAIST. Prof. Moon received a BSEE degree with high honor from Stony Brook University and M.S. and Ph.D. degrees in Electrical and Computer Engineering at Carnegie Mellon University. Prof. Moon’s research interests are in the area of channel characterization, signal processing and coding for data storage and digital communication. He also worked as Chief Technology Officer at Link-A-Media Devices Corp. in 2008. He is an IEEE Fellow.

Homepage: http://comstolab.kaist.ac.kr/

Incheol Park

Incheol Park is a Professor in the Department of Electrical Engineering and Computer Science at KAIST. He received the B.S. degree in Electronics Engineering from Seoul National University in 1986, the M.S. and Ph.D. degrees in Electrical Engineering from Korea Advanced Institute of Science and Technology(KAIST) in 1988 and 1992, respectively. His current research interests include CAD algorithms for high-level synthesis and VLSI architectures for general-purpose microprocessors. He is a senior member of the IEEE.

Homepage: http://ics.kaist.ac.kr/

Yeonseung Ryu

Yeonseung Ryu is an Associate Professor at Department of Computer Software, Myongji University, Korea. He received his BS, MS and Ph.D in the Dept. of Computer Science and Statistics, Seoul National University, Korea. His research interests include Operating Systems, Storage Systems, Multimedia Systems, and Network Systems.

Homepage: http://syso.mju.ac.kr/

Ilhoon Shin

Ilhoon Shin is a Professor in the Department of Electrical Engineering and Computer Science at KAIST. He received the B.S. degree in Electronics Engineering from Seoul National University in 1986, the M.S. and Ph.D. degrees in Electrical Engineering from Korea Advanced Institute of Science and Technology(KAIST) in 1988 and 1992, respectively. His current research interests include CAD algorithms for high-level synthesis and VLSI architectures for general-purpose microprocessors. He is a senior member of the IEEE.

Homepage: http://blue.snut.ac.kr/~ihshin/

Sungroh Yoon

Sungroh Yoon is an Assistant Professor of Electrical Engineering at Seoul University, Seoul, Korea. His research interests include high-performance solid-state drive (SSD) architecture based on NAND flash and other emerging non-volatile memory devices. He is also interested in SSD-based energy- efficient system design and biocomputation.

Homepage: http://acl.korea.ac.kr/