I'm an AssistantAssociate Professor in Department of Semiconductor Systems Engineering at Sungkyunkwan University (SKKU), Suwon, Korea. Please send me an email if you're interested in my research area.

Prior to SKKU, I was a Postdoctoral Associate in Department of Computer Science at Cornell University, working with Prof. Rachit Agarwal and Prof. A. Kevin Tang from 2018 to 2021. I worked at Samsung Electronics, Suwon, Korea as a Senior Engineer from 2015 to 2018 and Bell Labs, Alcatel-Lucent (currently Nokia), Seoul, Korea as a Member of Technical Staff from 2010 to 2015. I received my M.S. and Ph.D. degrees in computer science from Korea University, Seoul, Korea in 2005 and 2010, respectively and the B.S. degree in computer science from The Catholic University of Korea, Korea in 2003.

My research interests are generally in system software and operating systems, including storage disaggregation, data center systems, CPU-efficient storage/network stacks, and so on.

Selected Publications (Full list)

• Taeyoung Park, Yunjae Jo, Daegyu Han, Beomseok Nam, Jaehyun Hwang, "Lockify: Understanding Linux Distributed Lock Management Overheads in Shared Storage," to appear in USENIX FAST 2026.

• Duckwoo Kim, YoungGyoun Moon, Jaehyun Hwang, KyoungSoo Park, "FlexCP: A Scalable Multipath TCP Proxy for Cellular Networks," ACM CoNEXT 2023.

• Qizhe Cai, Midhul Vuppalapati, Jaehyun Hwang, Christos Kozyrakis, Rachit Agarwal, "Towards µs Tail Latency and Terabit Ethernet: Disaggregating the Host Network Stack," ACM SIGCOMM 2022.

• Qizhe Cai, Shubham Chaudhary, Midhul Vuppalapati, Jaehyun Hwang, Rachit Agarwal, "Understanding Host Network Stack Overheads," ACM SIGCOMM 2021.

• Jaehyun Hwang, Midhul Vuppalapati, Simon Peter, Rachit Agarwal, "Rearchitecting Linux Storage Stack for μs Latency and High Throughput," USENIX OSDI 2021.

• Jaehyun Hwang, Qizhe Cai, Ao Tang, Rachit Agarwal, "TCP ≈ RDMA: CPU-efficient Remote Storage Access with i10," USENIX NSDI 2020.

• Kyoungwoon Lee, Cheol-Ho Hong, Jaehyun Hwang, and Chuck Yoo, "Dynamic network scheduling for virtual routers," IEEE Systems Journal, vol. 14, no. 3, pp. 3618-3629, Sep. 2020 . 

• Cheol-Ho Hong, Kyoungwoon Lee, Jaehyun Hwang, Hyunchan Park, and Chuck Yoo, "Kafe: Can OS Kernels Forward Packets Fast Enough for Software Routers?," IEEE/ACM Transactions on Networking (ToN), vol. 26, no. 6, pp. 2734-2747, Dec. 2018.

• Jaehyun Hwang, Anwar Walid, and Joon Yoo, "Fast Coupled Retransmission for Multipath TCP in Data Center Networks," IEEE Systems Journal, vol. 12, no. 1, pp. 1056-1059, Mar. 2018. 

• Qiuyu Peng, Anwar Walid, Jaehyun Hwang, Steven H. Low, "Multipath TCP: Analysis, Design, and Implementation," IEEE/ACM Transactions on Networking (ToN), vol. 24, no. 1, pp. 596-609, Feb. 2016.

• Jaehyun Hwang, Joon Yoo, and Nakjung Choi, "Deadline and Incast Aware TCP for cloud data center networks," Computer Networks, vol. 68, pp. 20-34, Aug. 2014. (Special issue acceptance ratio: 12/60=20%) 

Awards

• 2019 SIGCOMM Networking Systems Award : "Multipath TCP Implementation in the Linux kernel" (involved in the MPTCP Linux kernel project as a contributor).

• 2017 IEEE Communications Society William R. Bennett Prize Paper Award ("The most honorable paper prize of IEEE in the field of communications networking") :

  • "Multipath TCP: Analysis, Design, and Implementation", IEEE/ACM Transactions on Networking, Feb, 2016.

Open Source Contributions

• NetChannel: Disaggregating the Host Network Stack [github]

• blk-switch: Rearchitecting Linux Storage Stack [github]

• i10: CPU-efficient Remote Storage Access [github]

• Multipath TCP congestion control algorithm, Balia, has been officially included in the MPTCP Linux kernel (since v0.90 release)  [http://multipath-tcp.org/pmwiki.php?n=Main.Release90]

Professional Services

• [SOSP'25] Finance Chair

• [NVMSA'24] Finance Chair, Registration Chair

• Program Committee:

  • 2025: NVMSA'25

  • 2024: NVMSA'24, HSN'24

  • 2023: NVRAMOS'23, HSN'23

Teaching

• Undergraduate courses

  • [SSE3071] Introduction to Network Systems: Fall 2025, Fall 2024

  • [SSE3044] System OS: Spring 2025, Spring 2024, Spring 2023

  • [SSE2030] Introduction to Computer Systems: Spring 2025, Spring 2024

  • [SWE3022] Introduction to Computer Networks: Fall 2023

  • [SWE2001] System Programs: Spring 2023, Spring 2022

  • [SSE3053] Programming Language and Compilers: Fall 2022

  • [SSE2034] System Software Practice III (C++ programing): Fall 2022

  • [SSE2032] System Software Practice I (C programming): Spring 2022

• Graduate courses

  • [ECE5989] Network System S/W Design: Fall 2024

  • [ECE5658] Operating System Design: Fall 2025, Fall 2023