Jeongseob Ahn (안정섭)

I am an Assistant Professor of the Department of Software & Computer Engineering at Ajou University.
Before joining Ajou University, I spent years at Oracle Labs, working a HW/SW co-design project.

Contact Information
- E-mail: jsahn @ ajou.ac.kr
- Office: Paldal Hall #1004-1
- Address: Ajou University, 206 Worldcup-ro, Yeongton-gu Suwon, South Korea 16499
- Tel: +82-31-219-3823

Research Group: Computer Systems Laboratory (http://csl.ajou.ac.kr)

Research Interests

• Computer Systems and Architecture, Systems for Machine Learning, Cloud Computing

Teaching

• SCE212: Computer Organization and Architecture (Fall 2017, Fall 2018)
• CSE515: Advanced Operating Systems (Fall 2018 w/ JeongGil Ko)
• SCE213: Operating Systems (Spring 2018)
• ICT331: Computer Organization (Spring 2018)
• CSE561: Advanced Computer Architecture (Fall 2017)

Experiences and Education

• Assistant Professor, Ajou University, Aug. 2017 ~ Present
• Researcher, Oracle Labs, Feb. 2016 ~ Jul. 2017
• Research Fellow, University of Michigan, Feb. 2015 ~ Jan. 2016
• Ph.D. in Computer Science, KAIST, Feb. 2015
  
• M.S. in Computer Science, KAIST, Feb. 2011
• B.S. in Computer Science and Engineering, Dongguk University, Feb. 2009
• Undergraduate Research Assistant, Samsung Electronics Software Membership, Jan. 2005 ~ Jan. 2009

Students

• Jonghyeon Kim (BS)
• Wonkyo Choe (BS)
• Taeklim Kim (BS)
• Jiwon Jeon (BS)

Publications [Google Scholar]

• "Improving Load Balancing for HBM Channels" [ Paper (to appear) ]
  Byoungchan Oh, Nam Sung Kim, Jeongseob Ahn, Bingchao Li, Ronald Dreslinski, and Trevor Mudge
  Proceedings of the 4th International Symposium on Memory Systems (MEMSYS), Washington DC, USA, October 2018.

• "Accelerating Critical OS Services in Virtualized Systems with Flexible Micro-sliced Cores" [ Paper | Slides ]
  Jeongseob Ahn, Chang Hyun Park, Taekyung Heo, and Jaehyuk Huh
  Proceedings of the 13th ACM European Conference on Computer Systems (EuroSys), Porto, Portugal, April 2018.

• "How Much Computation Power do you need for Near-Data Processing in Cloud?"
  Namhyung Kim, Jeongseob Ahn, Sungpack Hong, Hassan Chafi, and Kiyoung Choi
  The 7th Workshop on Architectures and Systems For Big Data (ASBD), Toronto, ON, Canada, June 2017.

• "Enhancing DRAM Self-Refresh Modes for Idle Power Reduction"
  Byoungchan Oh, Nilmini Abeyratne, Jeongseob Ahn, Ronald Dreslinski, and Trevor Mudge
  Proceedings of the 16th IEEE International Symposium on Low Power Electronics and Design (ISLPED), San Francisco, CA, USA, August 2016.

• "Fast Two-level Address Translation for Virtualized Systems" [Link]
  Jeongseob Ahn, Seongwook Jin, and Jaehyuk Huh
  IEEE Transactions on Computers (TC), 64(10):3461-3474, December 2015

• "H-SVM: Hardware-assisted Secure Virtual Machines under a Vulnerable Hypervisor" [Link]
  Seongwook Jin, Jeongseob Ahn, Jinho Seol, Sanghoon Cha, Jaehyuk Huh, and Seungryoul Maeng
  IEEE Transactions on Computers (TC), 64(10):2833-2846, October 2015

• "Micro-sliced Virtual Processors to Hide the Effect of Discontinuous CPU Availability for Consolidated Systems" [ Paper | Slides ]
  Jeongseob Ahn, Chang Hyun Park, and Jaehyuk Huh
  Proceedings of the 47th IEEE/ACM International Symposium on Microarchitecture (MICRO), Cambridge, UK, December 2014.

• "Subspace Snooping: Exploiting Temporal Sharing Stability for Snoop Reduction" [ Link ]
  Jeongseob Ahn, Daehoon Kim, Jaehong Kim, and Jaehyuk Huh
  IEEE Transactions on Computers (TC), 61(11):1624-1637, November 2012.

• "Revisiting Hardware-Assisted Page Walks for Virtualized Systems" [ Paper | Slides ]
  Jeongseob Ahn, Seongwook Jin, and Jaehyuk Huh
  Proceedings of the 39th ACM/IEEE International Symposium on Computer Architecture (ISCA), Portland, OR, USA, June 2012.

• "Dynamic Virtual Machine Scheduling in Clouds for Architectural Shared Resources" [ Paper | Slides | Code ]
  Jeongseob Ahn, Changdae Kim, Jaeung Han, Young-ri Choi, and Jaehyuk Huh
  Proceedings of the 4th USENIX Workshop on Hot Topics in Cloud Computing (HotCloud), Boston, MA, USA, June 2012.

• "Architectural Support for Secure Virtualization under a Vulnerable Hypervisor" [ Paper ]
  Seongwook Jin, Jeongseob Ahn, Sanghoon Cha, and Jaehyuk Huh
  Proceedings of the 44th IEEE/ACM International Symposium on Microarchitecture (MICRO), Porto Alegre, Brazil, December 2011.

• "Subspace Snooping: Filtering Snoops with Operating System Support" [ Paper ]
  Daehoon Kim, Jeongseob Ahn, Jaehong Kim, and Jaehyuk Huh
  Proceedings of the 19th ACM/IEEE International Conference on Parallel Architectures and Compilation Techniques (PACT), Vienna, Austria, September 2010.

• "The Effect of Multi-core on HPC Applications in Virtualized Systems" [ Paper | Slides ]
  Jaeung Han, Jeongseob Ahn, Changdae Kim, Youngjin Kwon, Young-ri Choi, and Jaehyuk Huh
  The 5th Workshop on Virtualization and High-Performance Cloud Computing (VHPC) , Ischia-Naples, Italy, August 2010.