In my office (October 2019)

Youngjae Kim

Associate Professor of Computer Science and Engineering

Director of Laboratory of Advanced System Software (LASS)

Office: Adam Schall Hall (AS911), Sogang University, Seoul, Republic of Korea

E-mail: youkim.a.t.sogang.ac.krTel: +82-2-705-8933

Address: AS911, 35 Baekbeom-ro, Mapo-gu, Seoul, Republic of Korea, 04107

News!

  • [Publication] Feb. 2020: Our paper titled in "DISKSHIELD: A Data Tamper-Resistant Storage for Intel SGX" accepted in ACM ASIACCS 2020.
  • [Publication] Feb. 2020: Our paper titled in "Crocus: Enabling Computing Resource Orchestration for Inline Cluster-wide Deduplication on Scalable Storage Systems" accepted in IEEE TPDS.
  • [Service] Jan. 2020: Invited to serve as a program chair for NVMSA'20 and NVRAMOS'20

Current Research Interests

  • Operating Systems (F2FS and NVM File Systems, File System Scalability)
  • Key-Value Store/Database (Log-Structured Merge based KV Store Optimization, NVM based KV Store, Key-Value Interfaced Solid-State Drive)
  • Computer System Security (Secure I/O Framework in OS for Kernel-Compromized Enviornemnt, Ransomware Attack Detection and Backup Solutions, WORM Storage, AI based Malware Attack Detection, Adversarial Attacks)
  • Energy-Aware Computing (Heap Memory Object Profiling and Energy-Optimal Object Placement in Hybrid Memory Systems, AI/ML/DL based Memory Object Pattern Prediction)
  • Distributed File Systems (Data Deduplication Framework in Ceph, Science Discovery Services for Distributed File Systems)
  • Distributed Deep Learning (Cloud Framework for Excution of Deep Learning Models)

2020

  1. [Security] Jinwoo Ahn, Junghee Lee, Yungwoo Ko, Donghyun Min, Jiyoon Park, Sungyong Park, Youngjae Kim, DISKSHIELD: A Data Tamper-Resistant Storage for Intel SGX, In Proceedings of the The 15th ACM ASIA Conference on Computer and Communications Security (ACM ASIACCS) (2020), Taipei, Tiwan, June 1-5, 2020. (Acceptance Rate: 67/308=21.7%)
  2. [Distributed System] Prince Hamandawana, Awais Khan, Chang-Gyu Lee, Sungyong Park, Youngjae Kim, Crocus: Enabling Computing Resource Orchestration for Inline Cluster-wide Deduplication on Scalable Storage Systems, IEEE Transactions on Parallel and Distributed Systems (TPDS), (accepted)

2019

  1. [Distributed System] Awais Khan, Taeuk Kim, Hyunki Byun, Youngjae Kim, SCISPACE: A Scientific Collaboration Workspace for GeoDistributed HPC Data Centers, Future Generation Computer Systems (FGCS), Vol 101, December 2019, pp. 398-409. [SCI] (5-Year Impact Factor: 5.768)
  2. [OS/Firmware] Chang-Gyu Lee, Hyeongu Kang, Donggyu Park, Sungyong Park, Youngjae Kim, Jungki Noh, Woosuk Chung, Kyoung Park, iLSM-SSD: An Intelligent LSM-tree based Key-Value SSD for Data Analytics, In Proceedings of the IEEE Int'l Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS) (2019), Rennes, France, October 22-25, 2019. (Acceptance Rate: 29/122 = 23.8%) [talk]
  3. [Compiler/ML] Khu-rai Kim, Youngjae Kim, Sungyong Park, Towards Robust Data-driven Parallel Loop Scheduling Using Bayesian Optimization, (short paper) In Proceedings of the IEEE Int'l Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS) (2019), Rennes, France, October 22-25, 2019. (Acceptance Rate: 32.0%) (39 papers accepted for 29 regular and 10 short papers combined out of 122 submissions) [talk]
  4. [OS] Joon-Hyung Kim, Jangwoong Kim, Hyeongu Kang, Chang-Gyu Lee, Sungyong Park, Youngjae Kim, pNOVA: Optimizing Shared File I/O Operations of NVM File System on Manycore Servers, Proceedings of the 10th ACM SIGOPS Asia-Pacific Workshop on Systems (APSys) (2019), Hangzhou, China, August 19-20, 2019. (Acceptance Rate: 15/35 = 42.8%) [talk]
  5. [OS] Chang-Gyu Lee, Hyunki Byun, Sunghyun Noh, Hyeongu Kang, Youngjae Kim, Write Optimization of Log-structured Flash File System for Parallel I/O on Manycore Servers, Proceedings of the 12th ACM International Systems and Storage Conference (Systor) (2019), Haifa, Israel, June 2019. (Acceptance Rate: 14/44 = 31.8%, 14 full papers accepted out 44 submissions) [talk]
  6. [Security] Donghyun Min, Donggyu Park, Jinwoo Ahn, Ryan Walker, Junghee Lee, Sungyong Park, Youngjae Kim, Amoeba: An Autonomous Backup and Recovery SSD for Ransomware Defense, Invited for presentation in the special session of 2018 best of CAL, HPCA 2019. [talk]
  7. [Distributed System] Hyogi Sim, Geffroy Vall ´ee, Youngjae Kim, Sudharshan Vazhkudai, Devesh Tiwari, Ali Butt, An Analysis Workflow-Aware Storage System for Multi-Core Active Flash Arrays, IEEE Transactions on Parallel and Distributed Systems (TPDS) (2019), Vol. 30, No. 2, pp. 271-285, February 2019.

2018

  1. [Security] Donghyun Min, Donggyu Park, Jinwoo Ahn, Ryan Walker, Junghee Lee, Sungyong Park, Youngjae Kim, Amoeba: An Autonomous Backup and Recovery SSD for Ransomware Defense, IEEE Computer Architecture Letter (CAL) (2018), 17(2):245-248 (December 2018). (Acceptance Rate: Approximately 24%) (Best Paper Award)
  2. [Distributed System] Awais Khan, Chang-Gyu Lee, Prince Hamandawana, Sungyong Park, Youngjae Kim, A Robust Fault-Tolerant and Scalable Cluster-wide Deduplication for Shared-Nothing Storage Systems, (short paper) In Proceedings of the IEEE Int'l Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS) (2018), Milwaukee, WI, USA, September 25-28, 2018. [talk] [video(partial)]
  3. [Security] Junghee Lee, Kalidas Ganesh, Hyuk-Jun Lee, Youngjae Kim, FeSSD: A Fast Encrypted SSD Employing On-Chip Access-Control Memory, IEEE Computer Architecture Letters (CAL) (2017), 16(2):115-118 (December 2017). (Acceptance Rate: Approximately 24%)
  4. [Profiling/Characterization] Xu Ji, Chao Wang, Nosayba El-Sayed, Xiaosong Ma, Youngjae Kim, Sudharshan S. Vazhkudai, Wei Xue, Daniel Sanchez, Understanding Object-level Memory Access Patterns Across the Spectrum, In Proceedings of the 2017 ACM/IEEE International Conference on High Performance Computing, Networking, Storage and Analysis (SC) (2017), Denver, CO, November 2017. (Acceptance Rate: 61/327 = 18.9%) [talk]
  5. [Distributed System] Hyogi Sim, Youngjae Kim, Sudharshan Vazhkudai, Geoffroy R. Valle ́e, Seung-Hwan Lim, Ali Butt, TagIt: An Integrated Search and Discovery Service for File Systems, In Proceedings of the 2017 ACM/IEEE International Conference on High Performance Computing, Networking, Storage and Analysis (SC) (2017), Denver, CO, November 2017. (Acceptance Rate: 61/327 = 18.9%) [talk]
  6. [I/O Scheduling] Kalidas Ganesh, Youngjae Kim, Monobrata Debnath, Sungyong Park, Junghee Lee, LAWC: Optimizing Write Cache using Layout-Aware I/O Scheduling for All Flash Storage, IEEE Transactions on Computer (TC) (2017), Vol. 66, No. 11, pp. 1890-1902, November 2017.
  7. [Security] Chintan Chavda, Ethan C. Ahn, Yu-Sheng Chen, Youngjae Kim, Sogang University; Kalidas Ganesh, Junghee Lee, Vulnerability Analysis of On-Chip Access-Control Memory, In Proceedings of the 9th USENIX Workshop on Hot Topics in Storage and File Systems (HotStorage) (2017), Santa Clara, CA, July 10-11, 2017. (Acceptance Rate: 21/51 = 41.1%) [talk]
  8. [Programming Model] Matt S. Lee, Hyogi Sim, Youngjae Kim, Sudharshan Vazhkudai, AnalyzeThat: A Programmable Shared-Memory System for an Array of Processing-In-Memory Devices, IEEE/ACM International Symposium on Cluster, Cloud and Grid Computing (CCGRID) (2017) (accepted as a short paper), Madrid, Spain, May 2017. [talk]
  9. [Performance Modeling] Seung-Hwan Lim, Youngjae Kim, A Quantitative Model of Application Slow-Down in Multi-Resource Shared Systems, Performance Evaluation (PEVA) (2017), Vol. 108, pp. 32-47, February 2017.
  10. [Distributed System] Youngjae Kim, Scott Atchley, Geoffroy R. Vallée, Matt S. Lee, Galen M. Shipman, Optimizing End-to-End Big Data Transfers over Terabits Network Infrastructure, IEEE Transactions on Parallel and Distributed Systems (TPDS) (2017), Vol. 28, No. 1, pp. 188-201, January 2017.
  11. [Distributed System] Hyogi Sim, Youngjae Kim, Sudharshan Vazhkudai, Devesh Tiwari, Ali Anwar, Ali Butt, Lavayna Ramakrishnan, AnalyzeThis: An Analysis Workflow-Aware Storage System, In Proceedings of the 2015 ACM/IEEE International Conference on High Performance Computing, Networking, Storage and Analysis (SC) (2015), Austin, TX, November 2015. (Acceptance Rate: 79/358 = 22.0%)
  12. [I/O Scheduling] Junghee Lee, Youngjae Kim, Jongman Kim, Galen Shipman, Synchronous I/O Scheduling of Independent Write Caches for an Array of SSDs, IEEE Computer Architecture Letters (CAL) (2015), 14(2):79-82 (July 2015). (Acceptance Rate: Approximately 24%)
  13. [Distributed System] Youngjae Kim, Scott Atchley, Geoffroy Valle ́e, Galen Shipman, LADS: Optimizing Data Transfers using Layout-Aware Data Scheduling, In Proceedings of the USENIX Conference on File and Storage Technologies (FAST) (2015), San Jose, CA, February 2015. (Acceptance Rate: 28/130 = 21.5%) [talk]
  14. [Parallel File System] S. Oral, J. Simmon, J. Hill, D. Leverman, F. Wang, M. Ezell, R. Miller, D. Fuller, R. Gunasekaran, Y. Kim, S. Gupta, D. Tiwari, S. Vazhkudai, J. Rogers, D. Dillow. A. Bland, G. Shipman, Best Practices and Lessons Learned from Deploying and Operating Large-Scale Data-Centric Parallel File systems, In Proceedings of the 2014 ACM/IEEE International Conference on High Performance Computing, Networking, Storage and Analysis (SC) (2014), New Orleans, LA, November 16-21, 2014. (Acceptance Rate: 82/394=21.3%)
  15. [I/O Scheduling] Youngjae Kim, Junghee Lee, Sarp Oral, David Dillow, Feiyi Wang, Galen M. Shipman, Coordinating Garbage Collection for Arrays of Solid-state Drives, IEEE Transactions on Computers (TC) (2014), Vol. 63, No. 4, pp. 888-901, April 2014.
  16. [I/O Scheduling] Junghee Lee, Youngjae Kim, Galen M. Shipman, Sarp Oral, Jongman Kim, Preemptible I/O Scheduling of Garbage Collection for Solid-state Drives, IEEE Transactions on Computer-Aided Design of Integrated Circuits and Systems (TCAD) (2013), Vol. 32, No. 2, pp. 247-260, February 2013.
  17. [HPC Architecture] Devesh Tiwari, Simona Bobila, Sudharshan Vazhkudai, Youngjae Kim, Xiaosong Ma, Peter Desnoyers, Yan Solin, Active Flash: Towards Energy-Efficient, In-Situ Data Analytics on Extreme-Scale Machines, In Proceedings of the USENIX Conference on File and Storage Technologies (FAST) (2013), San Jose, CA, February, 2013. (Acceptance Rate: 24/127 = 18.9%)
  18. [Energy Modeling] Devesh Tiwari, Sudharshan Vazhkudai, Youngjae Kim, Xiaosong Ma, Simona Boboila, Peter Desnoyers, Reducing Data Movement Costs using Energy-Efficient Active, Computation on SSD, In Proceedings of the USENIX Workshop on Power-Aware Computing and Systems (HotPower) (2012), co-located with OSDI, Hollywood, CA, October 2012. (Acceptance Rate: 10/39 = 25.6%)
  19. [Performance Modeling] Seung-Hwan Lim, Jae-Seok Huh, Youngjae Kim, Galen M. Shipman, Chita Das, D-Factor: A Quantitative Model of Application Slow-Down in Shared Service Systems with Multiple Resources, In Proceedings of the ACM Int'l Conference on Measurement and Modeling of Computer Systems (SIGMETRICS) (2012), London, United Kingdom, June 11-15, 2012. (Acceptance Rate: 31/203 = 15.2%) [talk]
  20. [Distributed System] Chao Wang, Sudharshan Vazhkudai, Xiaosong Ma, Fei Meng, Youngjae Kim, Christian Engelmann, NVMalloc: Exposing an Aggregate SSD Store as a Memory Partition in Extreme-Scale Machines, In Proceedings of the IEEE Int'l Parallel and Distributed Processing Symposium (IPDPS) (2012), Shanghai, China, May 21-25, 2012. (Acceptance Rate: 118/569 = 20.7%)
  21. [Storage Architecture] Simona Boboila, Youngjae Kim, Sudharshan Vazhkudai, Peter Desnoyers, Galen M. Shipman, Active Flash: Out-of-core Data Analytics on Flash Storage, In Proceedings of the IEEE Symposium on Massive Storage Systems and Technologies (MSST) (2012), Monterey, CA, April 16-20, 2012. (Acceptance Rate: 14/57 = 24.5%) [talk]
  22. [Storage Optimization] Youngjae Kim, Aayush Gupta, Bhuvan Urgaonkar, Piotr Berman, Anand Sivasubramaniam, HybridStore: A Cost-Efficient, High-Performance Storage System Combining SSDs and HDDs, In Proceedings of the IEEE Int'l Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS) (2011), Singapore, July 25-27, 2011. (Acceptance rate: 41/157 = 26.1%) [talk]
  23. [Distributed System] Ramya Prabhakar, Sudharshan Vazhkudai, Youngjae Kim, Ali Butt, Min Li, Mahmut Kantemir, Provisioning a Multi-Tiered Data Staging Area for Extreme-Scale Machines, In Proceedings of the International Conference on Distributed Computing Systems (ICDCS) (2011), Minneapolis, Minnesota, June 20-24, 2011. (Acceptance Rate: 87/565 = 15.1%)
  24. [Modeling/Scheduling] Seung-Hwan. Lim, Jae-Seok. Huh, Youngjae Kim, Chita Das, Migration, Assignment, and Scheduling of Jobs in Virtualized Environment, In Proceedings of the USENIX Workshop on Hot Topics in Cloud Computing (HotCloud) (2011), co-located with USENIX ATC, Portland, OR, June 2011. (Acceptance Rate: 23/72 = 31.0%)
  25. [I/O Scheduling] Youngjae Kim, Sarp Oral, Galen M. Shipman, Junghee Lee, David Dillow, Feiyi Wang, Harmonia: A Globally Coordinated Garbage Collector for Arrays of Solid-state Drives, In Proceedings of the IEEE Symposium on Massive Storage Systems and Technologies (MSST) (2011), Denver, Colorado, May 23-27, 2011. (Acceptance Rate: 15/63 = 23.8%) [talk]
  26. [I/O Scheduling] Junghee Lee, Youngjae Kim, Galen M. Shipman, Sarp Oral, Feiyi Wang, Jongman Kim, A Semi-Preemptive Garbage Collector for Solid State Drives, In Proceedings of the IEEE Int'l Symposium on Performance Analysis of Systems and Software (ISPASS) (2011), Austin, TX, April 10-12, 2011. (Best Paper Award Nomination)
  27. [Workload Characterization] Youngjae Kim, Raghul Gunasekaran, Galen M. Shipman, David Dillow, Zhe Zhang, Brad Settlemyer, Workload Characterization of a Leadership Class Storage, In Proceedings of the Petascale Data Storage Workshop in conjunction with SC (PDSW) (2010), co-located with SC New Orleans, LA, November 2010. [talk]
  28. [HPC Architecture] Min Li, Sudharshan Vazhkudai, Ali Butt, Fei Meng, Xiaosong Ma, Youngjae Kim, Christian Engelmann, Galen M. Shipman, Functional Partitioning to Optimize End-to-End Performance on Many-Core Architectures, In Proceedings of the IEEE/ACM Int'l Conference on High Performance Computing, Networking, Storage and Analysis (SC) (2010), New Orleans, LA, November 2010. (Acceptance Rate: 51/253 = 20.1%)
  29. [Architecture] Youngjae Kim, Brendan Tauras, Aayush Gupta, Bhutan Urgaonkar, FlashSim: A Simulator for NAND Flash-based Solid-State Drives, In Proceedings of the International Conference on Advances in System Simulation (SIMUL) (2009), Porto, Portugal, September 2009. (Acceptance Rate: 31.0%)
  30. [Architecture] Aayush Gupta, Youngjae Kim, and Bhuvan Urgaonkar, DFTL: A Flash Translation Layer Employing Demand-based Selective Caching of Page-level Address Mappings, In Proceedings of the International Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS) (2009), Washington DC, March 2009. (Acceptance Rate: 29/113 = 21.8%)
  31. [Data Center] Jeonghwan Choi, Youngjae Kim, Anand Sivasubramaniam, Jelena Srebric, Qian Wang, Joonwon Lee, CFD-based Tool for Studying Temperature in Rack-mounted Servers, EEEE Transactions on Computer (TC) (2008), Volume 57, Issue 8, Pages 1129-1142, August 2008.
  32. [Data Center] Jeonghwan Choi, Youngjae Kim, Anand Sivasubramaniam, Jelena Srebric, Qian Wang, Joonwon Lee, Modeling and Managing Thermal Profiles of Rack-mounted Servers with ThermoStat, In Proceedings of the International Symposium on High Performance Computer Architecture (HPCA) (2007), Phoenix, Arizona, February 2007. (Acceptance Rate: 28/174 = 16.0%) (Best Paper Award Nomination)
  33. [Architecture] Sudhanva Gurumurthi, Youngjae Kim, Anand Sivasubramaniam, Using STEAM for Thermal Simulation of Storage Systems, EEEE Micro Special Issue on Computer Architecture Simulation and Modeling (MICRO) (2006), Volume 26, Number 4, Pages 43-51, July/August 2006.
  34. [Architecture] Youngjae Kim, Sudhanva Gurumurthi, Anand Sivasubramaniam, Understanding the Performance-Temperature Interactions in Disk I/O of Server Workloads, In Proceedings of the IEEE Int'l Symposium on High Performance Computer Architecture (HPCA) (2006), Austin, Texas, February 2006. (Acceptance Rate: 26/172 = 15.6%) [TR]

Under Review

  1. [Operating System] Chang-Gyu Lee, Sunghyun Noh, Youngjae Kim, Linux Kernel Page Cache of File Systems with Readers-Writer Lock for Filesystem Scalability, Computer Systems Conference (title and conference name are temporary due to double blind review), (submitted)
  2. [Security] Donghyun Min, Yungwoo Ko, Jinwoo Ahn, Ryan Walker, Sungyong Park, Junghee Lee, Youngjae Kim, A Content-based Ransomware Detection and Backup Solid-State Drive for Ransomware Defense, IEEE Transactions on Computers (TC) - Special Issue on Hardware Security, (submitted)
  3. [Modeling/Optimization] Taeuk Kim, Safdar Jamil, Joongeon Park, Youngjae Kim, eMap: Optimizing Placement of Heap Memory Objects in Energy-Constrained Hybrid Memory Systems, IEEE Transactions on Computers (TC), (submitted)
  4. [Distributed System] Hyogi Sim, Awais Khan, Sudharshan Vazhkudai, Seung-Hwan Lim, Ali Butt, Youngjae Kim, An Integrated Search and Discovery Service for Distributed File Systems, IEEE Transactions on Parallel and Distributed Systems (TPDS), (under major revision)
  5. [Distributed System] Awais Khan, Prince Hamandawana, Youngjae Kim, A Content Fingerprint-based Cluster-wide Inline Deduplication for Shared-Nothing Storage Systems, ACM Transactions on Storage (TOS), (under revision for resubmission)
  6. [Distributed Systems/BlockChain] S. Woo, J. Song, S. Kim, Y. Kim, and S. Park, GARET: Improving Throughput using Gas Consumption-aware Relocation in Ethereum Sharding Environments, Cluster Computing: The Journal of Networks, Software Tools and Applications, 2020 (under minor revision)

Short Bio

Services

Supervising Students (LASS Members)

  • 6 PhD students
    1. Awais Khan (2015-)
    2. Chang-Gyu Lee (2017-)
    3. Safdar Jamil (2018-)
    4. Hyungu Kang (2019-)
    5. Donghyun Min (2019-)
    6. Abdul Salam (2020-)
  • 9 MS students
    1. Jinwoo Ahn (2018-) (joining Samsung Research, expected graduation: Aug. 2020)
    2. Joongeon Park (2019-)
    3. Yonghyuk Yoo (2019-)
    4. Yungwoo Ko (2019-)
    5. Jiyun Park (2019-)
    6. Hee-Rock Lee (2020-)
    7. Soon Hwang (2020-)
    8. *June-Hyung Kim (2019-) (joining LG CTO, expected graduation: Feb. 2021)
    9. *Min-Gyo Jeong (2019-) (* co-advised with Prof. Sungyong Park)
  • 3 BS students
    1. Jiyoung Hwang (Senior)
    2. Seungjin Lee (Senior) (double major: EE+CSE)
    3. Jinhoon Lee (Senior)
  • Alumni (First Employer, Graduation Year)

Ph.D.

M.S.

    1. Sunghyun Noh (Samsung Electronics, Mar. 2018-Feb. 2020)
    2. Dong-Gyu Park (TmaxSoft, Setp. 2017-Aug. 2019) (co-advised with Prof. Sungyong Park)
    3. Jangwoong Kim (TmaxSoft, Mar. 2017-Feb. 2019) (co-advised with Prof. Sungyong Park)
    4. Taeuk Kim (TmaxSoft, Mar. 2017-Feb. 2019)
    5. Hyunki Byun (TmaxSoft, Mar. 2017-Feb. 2019)
    6. Donghyun Min (PhD Program at Sogang University, Mar. 2017-Feb. 2019)

Students at Ajou University

    1. Prince Hamadawana (PhD Program at Ajou University, Mar. 2016-Feb. 2019)
    2. Preethika Kasu (PhD Program at Ajou University, Mar. 2016-Feb. 2019)

Honors & Awards

  1. Best Paper Award and Nomination
  2. Outstanding Research Award
    • Awarded from Oak Ridge National Laboratory, 2012
  3. Scholarship
  4. Graduation in Honor
    • Graduated in 1st rank with the highest GPA in class, Sogang University (July 2001)