• Youngjae Kim, Junghee Lee, Sarp Oral, David Dillow, Feiyi Wang, Galen M. Shipman, Coordinating Garbage Collection for Arrays of Solid-state Drives, (To appear) IEEE Transactions on Computers (IEEE TC). (pdf)
  
  
• Youngjae Kim, Aayush Gupta, Bhuvan Urgaonkar, A Temporal Locality-aware Page-Mapped Flash Translation Layer, (Accepted with minor revision) Journal of Computer Science and Technology (JCST).
  
  
• Junghee Lee, Youngjae Kim (corresponding author), 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 (IEEE TCAD), Vol. 32, pp. 247-260, February 2013. (pdf)
  
  
• 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, Proceedings of the USENIX Conference on File and Storage Technologies (FAST 2013), February, 2013. (24/127 = 18.9%)
  • This work was started when Mr. Tiwari (NCSU) was with ORNL for his summer internship (2012). I was a mentor of him with Dr. Sudharshan and Prof. Xiaosong.
  
  
• Byung-Hoon Park, Youngjae Kim, Beong-Do Kim, Taeyoung Hong, Sungjun Kim, John Lee, High Performance Computing: Infrastructure, Application, and Operation, Journal of Computing Science and Engineering (JCSE), December 2012.
  
  
• Myoungjae Jeon, Youngjae Kim, Jaeho Hwang, Joonwon Lee, Euiseong Seo, Workload Characterization and Performance Implications of Large-Scale Blog Servers, ACM Transactions on the Web (ACM TWEB), Volume 6, Issue 4, November, 2012. (pdf)
  
  
• Devesh Tiwari, Sudharshan Vazhkudai, Youngjae Kim, Xiaosong Ma, Simona Boboila, Peter Desnoyers, Reducing Data Movement Costs using Energy-Efficient Active, Computation on SSD, Proceedings of the USENIX Workshop on Power-Aware Computing and Systems (HotPower 2012), Hollywood, CA, October 2012. (10/39 = 25.6%) (pdf)
  • This work was started when Mr. Tiwari (NCSU) was with ORNL for his summer internship (2012). I was a mentor of him with Dr. Sudharshan and Prof. Xiaosong.
  
  
• 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, Proceedings of the ACM Int'l Conference on Measurement and Modeling of Computer Systems (SIGMETRICS 2012), London, United Kingdom, June 11-15, 2012. (31/203 = 15.2%) (pdf), (ppt)
  • This work was started when Mr. Lim (PSU) was with Penn State. I was a mentor of him with Dr. Jae-Seok Huh.
  
  
• 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, Proceedings of the 26th IEEE Int'l Parallel and Distributed Processing Symposium (IPDPS 2012), Shanghai, China, May 21-25, 2012. (118/569 = 20.7%) (pdf)
  
  
• Galen M. Shipman, David Dillow, Doug Fuller, Raghul Gunasekaran, J. Hill, Youngjae Kim, Sarp Oral, Doug Reitz, James Simmons, Feiyi Wang, A Next-Generation Parallel File System Environment for the OLCF, Proceedings of the Cray User Goup conference (CUG 2012), Stuttgart, Germany, April 29-May 3, 2012. (pdf)
  
  
• Simona Boboila, Youngjae Kim, Sudharshan Vazhkudai, Peter Desnoyers, Galen M. Shipman, Active Flash: Out-of-core Data Analytics on Flash Storage, Proceedings of the 28th IEEE Symposium on Massive Storage Systems and Technologies (MSST 2012), Monterey, CA, April 16-20, 2012. (14/57 = 24.5%) (pdf), (ppt)
  
  • This work was started when Ms. Boboila (Northeaster Univ.) was with ORNL for her summer internship (2011). I was a mentor of her with Dr. Sudharshan.
  
  
• Junghee Lee, Youngjae Kim, Sarp Oral, Galen M. Shipman, David Dillow, Feiyi Wang, Comparing Coordinated Garbage Collection Algorithms for Arrays of Solid-state Drives, Proceedings of the 3rd Non-Volatile Memories Workshop (NVMW 2012), San Diego, CA, March 4-6, 2012. (33/60l = 55.0%)
  • This work was started when Mr. Lee (Georgia Tech) was with ORNL for his summer internship (2011). I was a mentor of him.
  
  
• Simona Boboila, Youngjae Kim, Sudharshan Vazhkudai, Peter Desnoyers, Galen M. Shipman, Performance-Energy Tradeoffs for Out-of-Core Processing on Non-Volatile Memory Devices, Poster in the Proceedings of the 3rd Non-Volatile Memories Workshop (NVMW 2012), San Diego, CA, March 4-6, 2012. (A full paper appears in MSST 2012.) (pdf), (poster)
  
  • This work was started when Ms. Boboila (Northeaster Univ.) was with ORNL for her summer internship (2011). I was a mentor of her with Dr. Sudharshan.
  
  
• Youngjae Kim, Sudhanva Gurumurthi, Anand Sivasubramaniam, Dynamic Thermal Management for High-Performance Storage Systems, Book Chapter in Handbook of Energy-aware and Green Computing, Editors: Ishfaq Ahmad and Sanjay Rank, Publisher: Chapman and Hall/CRC Press Taylor and Francis Group LLC, December 26. 2011. ISBN-13: 978-1439850804.
  
  
• David Dillow, Sarp Oral, Galen M. Shipman, Zhe Zhang, Youngjae Kim, Enhancing I/O Throughput via Efficient Routing and Placement for Large-scale Parallel File Systems, Proceedings of the 30th IEEE Int'l Performance Computing and Communications Conference (IPCCC 2011), Orlando, FL, November 17-19, 2011. (36/129 = 27.9%) (pdf)
  
  
• Youngjae Kim, Aayush Gupta, Bhuvan Urgaonkar, Piotr Berman, Anand Sivasubramaniam, HybridStore: A Cost-Efficient, High-Performance Storage System Combining SSDs and HDDs, Proceedings of the 19th IEEE Int'l Symposium on Modeling, Analysis and Simulation of Computer and Telecommunication Systems (MASCOTS 2011), Singapore, July 25-27, 2011. (41/157 = 26.1%) (pdf) citation
  
  
• Ramya Prabhakar, Sudharshan Vazhkudai, Youngjae Kim, Ali Butt, Min Li, Mahmut Kandemir, Provisioning a Multi-Tiered Data Staging Area for Extreme-Scale Machines, Proceedings of the 31th Int'l Conference on Distributed Computing Systems (ICDCS 2011), Minneapolis, Minnesota, June 20-24, 2011. (87/565 = 15.1%) (pdf)
  • Ms. Prabhakar (Penn State) is a summer intern at ORNL in 2010. (Mentor: Dr. Youngjae and Dr. Sudharshan.)
  
  
• Seung-Hwan. Lim, Jae-Seok. Huh, Youngjae Kim, Chita Das, Migration, Assignment, and Scheduling of Jobs in Virtualized Environment, Proceedings of the 3rd USENIX Workshop on Hot Topics in Cloud Computing (HotCloud 2011), Portland, OR, June 2011. (23/72 = 31.0%) (pdf)
  
  
• 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, Proceedings of the 27th IEEE Symposium on Massive Storage Systems and Technologies (MSST 2011), Denver, Colorado, May 23-27, 2011. (15/63 = 23.8%) (pdf)
  
  
• Junghee Lee, Youngjae Kim, Galen M. Shipman, Sarp Oral, Feiyi Wang, Jongman Kim, A Semi-Preemptive Garbage Collector for Solid State Drives, Proceedings of the IEEE Int'l Symposium on Performance Analysis of Systems and Software (ISPASS 2011), Austin, TX, April 10-12, 2011. (pdf) Best Paper Nominee
  • This work was started when Mr. Lee (Georgia Tech) was with ORNL for his summer internship (2010). I was a mentor of him.
  
  
• Seon-Yeong. Park, Youngjae Kim, Bhuvan Urgaonkar, Joonwon Lee, Euiseong Seo. A Comprehensive Study on Energy Efficiency and Performance of Flash-based SSD, Elsevier Journal of System Architecture (Elsevier JSA), Volume 57, Issue 4, Pages 354-365, April 2011. (pdf) Among 25 most downloaded JSA papers in 2011 source,
  
  
• Youngjae Kim, Junghee Lee, Galen M. Shipman, Pathological Behavior of SSDs and Application in HPC Storage, Proceedings of the 2nd Non-Volatile Memories Workshop (NVMW 2011), San Diego, CA, March 2011. (32/63 = 50.7%)
  
  
• Youngjae Kim, Raghul Gunasekaran, Galen M. Shipman, David Dillow, Zhe Zhang, Brad Settlemyer, Workload Characterization of a Leadership Class Storage, Proceedings of the 5th Petascale Data Storage Workshop (PDSW 2010), New Orleans, LA, November 2010. (pdf), (ppt)
  
  
• 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, Proceedings of Supercomputing (SC): the 23th IEEE/ACM Int'l Conference on High Performance Computing, Networking, Storage and Analysis (SC 2010), New Orleans, LA, November 2010. (51/253 = 20.1%) (pdf)
  
  
• Myoungjae Jeon, Jae-Ho Hwang, Youngjae Kim, Jae-Wan. Jang, Joonwon Lee, Euiseong Seo, Measurement, Modeling, and Analysis of a Large-scale Blog Sever Workload, Proceedings of the Int'l Symposium on Social Computing Applications (SCA 2010), Minneapolis, MN, August 2010. (Invited paper, only 15% selected from SocialCom-10 submissions.) (pdf)
  
  
• Youngjae Kim, Brendan Tauras, Aayush Gupta, Bhuvan Urgaonkar, FlashSim: A Simulator for NAND Flash-based Solid-State Drives, Proceedings of the Int'l Conference on Advances in System Simulation (SIMUL 2009), Porto, Portugal, September 2009. (Acceptance Rate: 31.0%) (pdf)
  
  
• Aayush Gupta, Youngjae Kim, and Bhuvan Urgaonkar, DFTL: A Flash Translation Layer Employing Demand-based Selective Caching of Page-level Address Mappings, Proceedings of the 14th Int'l Conference on Architectural Support for Programming Languages and Operating Systems (ASPLOS 2009), Washington DC, March 2009. (29/113 = 21.8%) (pdf)
  
  
• Youngjae Kim, Jeonghwan Choi, Sudhanva Gurumurthi, Anand Sivasubramaniam, Managing Thermal Emergencies in Disk-Based Storage Systems, ASME Journal of Electronic Packaging (ASME JEP), Volume 130, Issue 4, Pages 041105, 1-8, December 2008. (pdf) Among top 10 most downloaded articles -- November 2008 source
  
  
• Jeonghwan Choi, Youngjae Kim, Anand Sivasubramaniam, Jelena Srebric, Qian Wang, Joonwon Lee, CFD-based Tool for Studying Temperature in Rack-mounted Servers, IEEE Transactions on Computer (IEEE TC), Volume 57, Issue 8, Pages 1129-1142, August 2008. (pdf)
  
  
• Youngjae Kim, Jeonghwan Choi, Sudhanva Gurumurthi, Anand Sivasubramaniam, Graceful Operation of Disk Drives under Thermal Emergencies, Proceedings of the Int'l Conference on Thermal Issues in Emerging Technologies Theory and Application (THETA 2007), Cairo, Egypt, January 2007. Selected for Journal publication in ASME Journal of Electronic Packaging.
  
  
• Jeonghwan Choi, Youngjae Kim, Anand Sivasubramaniam, Jelena Srebric, Qian Wang, Joonwon Lee, Modeling and Managing Thermal Profiles of Rack-mounted Servers with ThermoStat, Proceedings of the 13th Int'l Symposium on High Performance Computer Architecture (HPCA 2007), Phoenix, Arizona, February 2007. (28/174 = 16.0%) (pdf) Best Paper Nominee
  
  
• Sudhanva Gurumurthi, Youngjae Kim, Anand Sivasubramaniam, Using STEAM for Thermal Simulation of Storage Systems, IEEE Micro Special Issue on Computer Architecture Simulation and Modeling (IEEE Micro), Volume 26, Number 4, Pages 43-51, July/August 2006. (pdf)
  
  
• Youngjae Kim, Sudhanva Gurumurthi, Anand Sivasubramaniam, Understanding the Performance-Temperature Interactions in Disk I/O of Server Workloads, Proceedings of the 12th IEEE Int'l Symposium on High Performance Computer Architecture (HPCA 2006), Austin, Texas, February 2006. (26/172 = 15.6%) (pdf), (Detailed Technical Report)
  
  
• Youngjae Kim, Soyeon Park, Seungryoul Maeng, Practical Schemes Using Logs for Lightweight Recoverable DSM, Proceedings of the IASTED Int'l Conference on Parallel and Distributed Computing and Systems (PDCS 2003), Marina del Rey, CA, November 2003. (pdf)
  
  
• Soyeon Park, Youngjae Kim, Seungryoul Maeng, Lightweight Logging and Recovery for Distributed Shared Memory over Virtual Interface Architecture, Proceedings of the 2nd Int'l Symposium on Parallel and Distributed Computing (ISPDC 2003), Ljubljana, Slovenia, October 2003. (pdf)
  

Technical Reports (Unpublished)

• Zhe Zhang, Youngjae Kim, Xiaosong Ma, Galen M. Shipman, Yuanyuan Zhou, Multi-level Hybrid Cache: Impact and Feasibility, Technical Report (ORNL/TM-2010/297), National Center for Computational Sciences, Oak Ridge National Laboratory, February 2012. (pdf)
  
  
• Youngjae Kim, Sarp Oral, David Dillow, Feiyi Wang, Douglas Fuller, Steve Poole, Galen M. Shipman, An Empirical Study of Redundant Array of Independent Solid-State Drives (RAIS), Technical Report (ORNL/TM-2010/61). National Center for Computational Sciences, Oak Ridge National Laboratory, March 2010. (pdf)

Under Submission

• Youngjae Kim et. al., Coordinated Garbage Collection for RAID Array of Solid State Disks, U.S. Patent Application 61,370,908 filed August 5, 2010, Provisional Acceptance on September 2010. A full application was filed in the USPTO on January 28, 2011.
  
  
• Youngjae Kim, et al., HybridPlan: A Capacity Planning Technique for Projecting Storage Requirements in Hybrid Storage Systems, submitted for Journal Review.

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