Research Interest

My research interests are in the areas of computer architecture and operating system related to memory and storage systems. While pursuing my Ph.D., focusing on NAND flash memory-based storage systems, I work on (i) characterizing their behaviors under various computing environments such as HPC and cloud, (ii) modeling their performance and lifetime, and (iii) devising performance and lifetime enhancement techniques for such systems.


Ph.D. in Computer Science and Engineering

Aug 2012 - Dec 2020
Pennsylvania State University
  • Advisor: Prof. Mahmut Kandemir
  • Thesis: Case-Specific Lifetime Management Strategies for Long-Lasting Flash Devices

M.S. in Computer Science and Engineering

Mar 2007 - Feb 2009
Seoul National University

B.S. in Computer Science and Engineering

Mar 2003 - Feb 2007
Seoul National University


Design of a Host Interface Logic for GC-Free SSDs
M. Jung, W. Choi*, M. Kwon, S. Srikantaiah, J. Yoo, M. Kandemir
TCAD, vol. 39, no. 8, 2020
Fair Write Attribution and Allocation for Consolidated Flash Cache
W. Choi*, B. Urgaonkar, M. Kandemir, M. Jung, D. Evans
ASPLOS, 2020
Fair Resource Allocation in Consolidated Flash Systems
W. Choi*, B. Urgaonkar, M. Kandemir, M. Jung
HotStorage, 2019
Invalid Data-Aware Coding to Enhance the Read Performance of High-Density Flash Memories
W. Choi*, M. Jung, M. Kandemir
MICRO, 2018
Parallelizing Garbage Collection with I/O to Improve Flash Resource Utilization
W. Choi*, M. Jung, M. Kandemir, C. Das
HPDC, 2018
A Scale-Out Enterprise Storage Architecture
W. Choi*, M. Jung, M. Kandemir, C. Das
ICCD, 2017
Exploiting Data Longevity for Enhancing the Lifetime of Flash-based Storage Class Memory
W. Choi*, M. Arjomand, M. Jung, M. Kandemir
An In-Depth Study of Next Generation Interface for Emerging Non-Volatile Memories
W. Choi*, J. Zhang, S. Gao, J. Lee, M. Jung, M. Kandemir
NVMSA, 2016
NANDFlashSim: High-Fidelity, Micro-Architecture-Aware NAND Flash Memory Simulation
M. Jung, W. Choi*, S. Gao, E. Wilson, D. Donofrio, J. Shalf, M. Kandemir
TOS, vol. 12, no. 2, 2016
HIOS: A Host Interface I/O Scheduler for Solid State Disks
M. Jung, W. Choi*, S. Srikantaiah, J. Yoo, M. Kandemir
ISCA, 2014
Triple-A: A Non-SSD Based Autonomic All-Flash Array for Scalable High Performance Computing Storage Systems
M. Jung, W. Choi*, J. Shalf, M. Kandemir
ASPLOS, 2014
ePRO-MP: A Tool for Profiling and Optimizing Energy and Performance of Mobile Multiprocessor Applications
W. Choi*, H. Kim, W. Song, J. Song, J. Kim
Scientific Programming, vol. 17, No. 4, 2009


Summer Intern

May 2018 - Aug 2018
Samsung Semiconductor, San Diego, CA

Summer Intern

May 2017 - Aug 2017
Seagate, Shakopee, MN

Software Engineer

Mar 2009 - May 2012
Samsung Electronics, Suwon, Republic of Korea