Jaehyung Ahn

High Performance Computing Researcher

Jaehyung Ahn

Current: Staff researcher in SAIT (May. 2019 ~ )

Contact: jh2ekd_at_gmail.com

Research Experiences

  • Software-hardware / OS-application co-optimization, especially about I/O
  • Large AI model distributed training
  • Server architecture with high performance devices
  • FPGA-based accelerator prototyping
  • Supercomputer reliability

and SSD modeling, multi-tier object storage system, CPU architecture, and so on.

Publications

Google Scholar

  • DCS: a fast and scalable device-centric server architecture, Micro 2015
    • Jaehyung Ahn, Dongup Kwon, Youngsok Kim, Mohammadamin Ajdari, Jaewon Lee, Jangwoo Kim
  • DCS-ctrl: a fast and flexible device-control mechanism for device-centric server architecture, ISCA 2018
    • Dongup Kwon, Jaehyung Ahn, Dongju Chae, Mohammadamin Ajdari, Jaewon Lee, Suheon Bae, Youngsok Kim, Jangwoo Kim
  • SSDcheck: Timely and accurate prediction of irregular behaviors in black-box ssds, Micro 2018
    • Joonsung Kim, Pyeongsu Park, Jaehyung Ahn, Jihun Kim, Jangwoo Kim, Jong Kim
  • DTStorage: Dynamic tape-based storage for cost-effective and highly-available streaming service, CCGrid 2016
    • Jaewon Lee, Jaehyung Ahn, Choongul Park, Jangwoo Kim
  • Enforcing Last-level Cache Partitioning through Memory Virtual Channels, PACT 2019
    • Jongwook Chung, Yuhwan Ro, Joonsung Kim, Jaehyung Ahn, Jangwoo Kim, John Kim, Jae W. Lee, Jung Ho Ahn
  • Breaking MLPerf Training: A Case Study on Optimizing BERT, Arxiv
    • Yongdeok Kim, Jaehyung Ahn, Myeongwoo Kim, Changin Choi, Heejae Kim, Narankhuu Tuvshinjargal, Seungwon Lee, Yanzi Zhang, Yuan Pei, Xiongzhan Linghu, Jingkun Ma, Lin Chen, Yuehua Dai, Sungjoo Yoo

Education

  • Mar. 2013 ~ Feb. 2019: Ph.D in Computer Science and Engineering, POSTECH, Korea.
  • Mar. 2009 ~ Feb. 2013: B.S. in Computer Science and Engineering, POSTECH, Korea.

Awards

  • 2nd place as a member of PLUS, CODEGATE 2011 Capture The Flag Apr 2011
  • 3rd place as a member of Kaist@postech, DEF CON 18 Capture The Flag Aug 2010

DEF CON and CODEGATE are the most prestigious international hacking competitions. I joined the team and reverse engineered binaries, decrypted ciphers, and exploited & patched vulnerabilities.