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Sangwook Shane Hahn

PhD Candidate

shanehahn@davinci.snu.ac.kr

Gold Prize in Computer Science & Engineering, Samsung Humantech Paper Award, 2014

Best Paper Award in Mobile Application and System, Korea Computer Congress, 2016

PhD Fellowship, Naver Corporation, 2016

Participation Prize in Computer Science & Engineering,  Samsung Humantech Paper Award, 2017

Student Grants USENIX FAST 2014, USENIX OSDI 2014, USENIX FAST 2016, ACM SIGOPS APSys 2017

  • NAND flash management software
  • Storage system solution
  • Cross-layer optimization
  • Linux operating system development (I/O stack)
  • ARM architecture-based embedded system
  • Android mobile system
  • "SOS : Software-based Out-of-Order Scheduling for High-Performance NAND Flash-Based SSDs", Sangwook Shane Hahn, Sungjin Lee, and Jihong Kim, IEEE 29th Symposium on Mass Storage Systems and Technologies (MSST 2013), Long Beach, USA, May 6-10, 2013
  • "Improving NAND Endurance by Dynamic Program and Erase Scaling", Jaeyong Jeong, Sangwook Shane Hahn, Sungjin Lee, and Jihong Kim, USENIX Workshop on Hot Topics in Storage and File Systems (HotStorage '13), San Jose, USA, June 27-28, 2013
  • "Lifetime Improvement of NAND Flash-based Storage Systems Using Dynamic Program and Erase Scaling", Jaeyong Jeong, Sangwook Shane Hahn, Sungjin Lee, and Jihong Kim, USENIX Conference on File and Storage Technologies (FAST '14), Santa Clara, USA, February 17-20, 2014
  • To Collect or Not to Collect: Just-in-Time Garbage Collection for High-Performance SSDs with Long Lifetimes", Sangwook Shane Hahn, Sungjin Lee, and Jihong Kim, Design Automation Conference (DAC'15), San Francisco, USA, June 7-11, 2015
  • AIOPro : A Fully-Integrated Storage I/O Profiler for Android Smartphones", (Best Paper Award) Sangwook Shane Hahn, Inhyuk Yee, Donguk Ryu and Jihong Kim, Korea Computer Congress (KCC'16), Jeju, Republic of Korea, June 26-30, 2016
  • AIOPro : A Fully-Integrated Storage I/O Profiler for Android Smartphones", Sangwook Shane Hahn, Inhyuk Yee, Donguk Ryu and Jihong Kim, Journal of KIISE (JOK'17), Vol. 44, no. 3, pp. 232-238, 2017
  • Dynamic Erase Voltage and Time Scaling for Extending Lifetime of NAND Flash-Based SSDs", Jaeyong Jeong, Youngsun Song, Sangwook Shane Hahn, Sungjin Lee, and Jihong Kim, IEEE Transactions on Computers, Vol. 66, 2017
  • qtar: Design and Implementation of the Optimized tar Command with FTL-level Remapping Technique", Jeongseok Ryoo, Sangwook Shane Hahn and Jihong Kim, Korea Computer Congress (KCC'17), Jeju, Republic of Korea, June 26-30, 2017
  • Improving File System Performance of Mobile Storage Systems Using a Decoupled Defragmenter", Sangwook Shane Hahn, Sungjin Lee, Cheng Ji, Li-Pin Chang, Inhyuk Yee, Liang Shi, Chun Jason Xue and Jihong Kim, USENIX Annual Technical Conference (ATC'17), Santa Clara, USA, July 12-14, 2017
  • Garbage Collection Synchronization Technique for Improving Tail Latency of Cloud Databases", Seungwook Han, Sangwook Shane Hahn and Jihong Kim, Journal of KIISE (JOK'17), Vol. 44, no. 8, pp. 767-773, 2017
  • Improving User Experience of Android Smartphones Using Foreground App-Aware I/O Management", Sangwook Shane Hahn, Sungjin Lee, Inhyuk Yee and Jihong Kim, Asia-Pacific Workshop on Systems (APSys'17), Mumbai, India, September 2-3, 2017
  • Research for SSD Endurance Improvement with Data Compression (R&DB, Dec 2013 ~ Nov 2015)
  • Host-Level FTL Implementation using Enterprise SSD (R&DB, Oct 2014 ~ Sep 2015)
  • Research for I/O Stack Performance Improvement for UFS Storage (R&DB, Jul 2015 ~ Aug 2016)
  • Research for Cross-Layer Optimization for NAND Flash-Based Storage System (R&DB, Jul 2016 ~ Present)
  • Research for an Integrated Optimization Solution for next-generateion NAND-based Storage Devices (Ministry of Science, ICT and Future Planning, Dec 2013 ~ Nov, 2016)
  • Study on Storage Systems for Exa-scale High Performance Computing Systems (Korea Research Foundation, Oct 2015 ~ Present)
  • International Patent, China, DATA STORAGE DEVICE FOR COMPRESSING INPUT DATA, 2017.  
  • Domestic Patent, Republic of Korea, GARBAGE COLLECTION METHOD FOR FLASH MEMORY, 2017.
  • Domestic Patent, Republic of Korea, DATA STORAGE DEVICE FOR COMPRESSING INPUT DATA, 2016.