Professor

Youjip Won   

ICT Endowed Chair Professor
Director, Center for File and Storage Systems Research
Dept of Electrical Engineering, KAIST

Postdoctoral researcher

Juwon Kim

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

Publications

  • [ACM HotStorage] Hwanseok Yoo, Juwon Kim, and Youjip Won, “Manycore Scalable Logging for Log-Structured Filesystem”, In Proc. of ACM Workshop on Hot Topics in Storage and File Systems (HotStorage), Prague, Czechia, Sep 28th – 29th, 2026
  • [ACM SOSP] Juwon Kim, Hwanseok Yoo, Seung Won Yoo, and Youjip Won, “GAZE: Rearchitecting Log-Structured Filesystem for Garbage Collection on Zoned Namespace Flash Storage”, In Proc. ACM Symposium on Operating Systems Principles (SOSP), Prague, Czechia, Sep. 29th – Oct. 2nd, 2026.
  • [IEEE NVMSA] Jihoon Seok, Juwon Kim, Youjip Won, “LeaST: Learned Sector Translation for Skipped Physical Page Address,” in Proc. IEEE Non-Volatile Memory Systems and Applications Symposium (NVMSA), Aug. 2026.
  • [USENIX FAST] Juwon Kim, Seungjae Lee, Joontaek Oh, Dongkun Shin, and Youjip Won, “D2FS: Device-Driven Filesystem Garbage Collection”, In Proc. of USENIX Conference on File and Storage Technologies (FAST) 2025, Feb. 25-27, 2025
  • [USENIX FAST] Jieun Kim, Joontaek Oh, Juwon Kim, Seung Won Yoo, and Youjip Won, “OPIMQ: Order Preserving IO stack for Multi-Queue Block Device”, In Proc. of USENIX Conference on File and Storage Technologies (FAST) 2025, Feb. 25-27, 2025
  • [ACM SAC] Juwon Kim, Dongeon Kim, Seung Won Yoo, Myoengin Cheon, Joontaek Oh, and Youjip Won, “lwFSCK: Light-weight Filesystem Check”, ACM Symposium on Applied Computing (SAC) 2025, Mar. 3 – Apr. 4, 2025
  • [USENIX ATC] Juwon Kim, Minsu Jang, Danish Muhammad Teeshen, Joontaek Oh, and Youjip Won “IPLFS: Log-Structured File System without Garbage Collection“, In Proc. of USENIX Annual Technical Conference (ATC) 2022, July. 11-13, 2022

PhD Students

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

  • [ACM HotStorage] Jieun Kim, Dohyun Kim and Youjip Won, “Fair I/O Scheduler for Alleviating Read/Write Interference by  Forced Unit Access in Flash Memory”, In Proc. of ACM HotStorage’22, Virtual, June. 27-28, 2022
  • [KIISE 논문지] 김지은, 유승원, 원유집 “현대 입출력 스택에서 쓰기 순서 효율적 보장에 대한 고찰” 정보과학회 논문지, 제43권, 제3호, 2025년 3월, pp.27-35
  • [USENIX FAST] Jieun Kim, Joontaek Oh, Juwon Kim, Seung Won Yoo, and Youjip Won, “OPIMQ: Order Preserving IO stack for Multi-Queue Block Device“, In Proc. of USENIX Conference on File and Storage Technologies (FAST) 2025, Feb, 25-27, 2025
  • Jieun Kim, Dohyun Kim, Minki Kang, and Youjip Won, “Storage IO Characterization in Autonomous Driving System”, IEEE Transactions on Intelligent Vehicles, In submission
김도현

Dohyun Kim

Dohyun Kim is a PhD 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

Junhan Lee

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

Publications

Seung Won Yoo

Seung Won Yoo is PhD student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interest is Filesystem.

Publications

  • [USENIX FAST] Joontaek Oh, Seung Won Yoo, Hojin Nam, Changwoo Min and Youjip Won, “CJFS : Concurrent Journaling for Better Scalability”, In Proc. of USENIX Conference on File and Storage Technologies (FAST) 2023, Feb, 20-23, 2023
  • [ACM SYSTOR] Seung Won Yoo, Joontaek Oh, and Youjip Won “O-AFA: Order Preserving All Flash Array”, in Proc. of The ACM International Systems and Storage Conference (SYSTOR), Haifa, Israel, June. 13-15, 2022

Sukjoon Oh

Sukjoon Oh is PhD student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interest is Linux kernel .

Publications

Bonmoo Koo

Bonmoo Koo is PhD student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interest is Storage.

Publications

Gyeongjun Ha

Gyeongjun Ha is a MS leading to PhD integrated student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interests are File systems and Storage.

Publications

MS Students

Hyobyung Han

Hyobyung Han is MS student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interest is File system and Storage

Publications

Hwanseok Yoo

Hwanseok Yoo is a MS student at Department of Electrical Engineering, KAIST. He is a member of Operating System Laboratory. His research interests are Filesystem and OS kernel.

Publications

Minki Kang

Minki Kang is a MS student at Department of Electrical Engineering, KAIST. She is a member of Operating System Laboratory. Her research interests are Storage and GPU System.

Publications

Jaewon Lee

Jaewon Lee is MS student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interest is OS kernel.

Publications

Whanseok Kim

Whanseok Kim is MS student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interest is File system and Storage.

Publications

Minjun Kim

Minjun Kim is MS student at Department of Electrical Engineering, KAIST. He is a member of Operating system laboratory. His research interest is File system and Storage.

Publications

Yoonsoo Oh

Yoonsoo Oh is MS student at Department of Electrical Engineering, KAIST. He is a member of Operating system Laboratory. His research interest is GPU File System.

Publications

Alumni

  • Muhammad Danish Tehseen,Braindeck,2026
  • 석지훈 (Seok, Jihoon), SK hynix,2026
  • 이승재 (Lee, Seungjae),,2025
  • 오준택 (Oh, Joontaek), University of Wisconsin–Madison, 2024
  • 최병현 (Choi, Byeonghyeon), , 2024
  • 박수익 (Park, Suik), SK Hynix, 2024
  • 김동언 (Kim, Dongeon), Presto Labs, 2024
  • 임승호 (Lim, Seungho), SK Hynix, 2024
  • 황채영 (Hwang, Chaeyoung), LG CNS, 2024
  • 장주현(Jang, Juhyeon), 삼성전자, 2023
  • 장민수(Jang, Minsu), 셀렉트스타, 2022
  • 민광원(Min, Kwangwon), 삼성전자, 2022
  • 김용진(Kim, Yongjin), LG CTO, 2022
  • 남호진(Nam, Hojin), 삼성전자, 2022
  • 지시온(Ji, Sion),삼성전자,2022
  • 박정안(Park,JeoungAhn),SK hynix,2022
  • 이도근(Lee, Dokeun), SK hynix, 2021
  • 황태호(Hwang, Taeho), SK hynix, 2020
  • 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), (주)코비전, 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), 신세계, 2017
  • 이성진(Lee, Seongjin), 경상대학교, 2016
  • 천승용(Cheon, Seungyong), LG CTO, 2016
  • 손한근(Son, Hankeun ), SK Hynix, 2016
  • 유밝은(Yoo, Balgeun), LG CTO, 2016
  • 정재민(Jung, Jaemin), Samsung MSL, 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),고영테크놀러지, 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
  • 여해동(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), 네이버, 2008
  • 조성호(Cho, Sungho), , 2008
  • 한석희(Han, SeokHee), LG CTO, 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), 네이버, 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),Phantom AI, 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), Univ. of Texas at Dallas, 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