Jaehyun Hwang, Ph.D.
      Postdoctoral Associate
      441 Gates Hall
      Department of Computer Science
      Cornell University, Ithaca, NY, 14850


Jaehyun Hwang received the B.S. degree in computer science from The Catholic University of Korea, Korea in 2003, and the M.S. and Ph.D. degrees in computer science from Korea University, Seoul, Korea in 2005 and 2010, respectively. He worked at Bell Labs, Alcatel-Lucent (currently Nokia), Seoul, Korea as a Member of Technical Staff from 2010 to 2015 and Samsung Electronics, Suwon, Korea as a Senior Engineer from 2015 to 2018. Since Nov 2018, he has been with the Department of Computer Science, Cornell University, Ithaca, NY, USA as a Postdoctoral Associate and working with Prof. Rachit Agarwal and Prof. A. Kevin Tang.

Research Interests
  • Cloud computing / data center networking
  • Big data platforms / communications
  • TCP & MPTCP congestion control
  • Software-defined networking (SDN)
  • Network virtualization
  • Dynamic adaptive streaming over HTTP (DASH)
  • 5G mobile network systems
Open-source contribution

Publications  [Google citations]

 - Under submission / In preparation
  • Jaehyun Hwang and Joon Yoo, "A Memory-Efficient Transmission Scheme for Multi-Homed Internet of Things (IoT) Devices," in preparation.

 - Journal papers
  • Kyoungwoon Lee, Cheol-Ho Hong, Jaehyun Hwang, and Chuck Yoo, "Dynamic network scheduling for virtual routers," accepted to IEEE Systems Journal, 2019. (SCI-indexed) [pdf]
  • Cheol-Ho Hong, Kyoungwoon Lee, Jaehyun Hwang, 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. (SCI-indexed) [pdf]
  • 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. (SCI-indexed) [pdf]
  • Jaehyun Hwang, Junghwan Lee, and Chuck Yoo, "Eliminating bandwidth estimation from adaptive video streaming in wireless networks," Signal Processing: Image Communication, vol. 47, pp. 242-251, Sep. 2016. (SCI-indexed) [pdf]
  • Jaehyun HwangCheol-Ho Hong, and Hyo-Joong Suh, "Dynamic Inbound Rate Adjustment Scheme for Virtualized Cloud Data Centers," IEICE Transactions on Information and Systems, vol. E99-D, no. 3, pp. 760-762, Mar. 2016. (SCIE-indexed) [pdf]
  • 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. (SCI-indexed) [pdf]
  • Jaehyun Hwang and Sang-Seon Byun, "A Resilient Buffer Allocation Scheme in Active Queue Management: A Stochastic Cooperative Game Theoretic Approach," International Journal of Communication Systems (IJCS), vol. 28, no. 6, pp. 1080-1099, Apr. 2015. (SCIE-indexed) [pdf]
  • 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%) (SCIE-indexed) [pdf]
  • Jaehyun Hwang, Junghwan Lee, Nakjung Choi, and Chuck Yoo, "HAVS: Hybrid Adaptive Video Streaming For Mobile Devices," IEEE Transactions on Consumer Electronics (T-CE), vol. 60, no. 2, pp. 210-216, May 2014. (ICCE issue acceptance ratio: 5%) (SCI-indexed) [pdf]
  • Jaehyun Hwang and Joon Yoo, "FaST: Fine-grained and Scalable TCP for Cloud Data Center Networks," KSII Transactions on Internet and Information Systems (TIIS), vol. 8, no. 3, pp. 762-777, Mar. 2014. (SCIE-indexed) [pdf]
  • Junghwan Lee, Jaehyun Hwang, Nakjung Choi, and Chuck Yoo, "SVC-based Adaptive Video Streaming over Content-Centric Networking," KSII Transactions on Internet and Information Systems (TIIS), vol. 7, no. 10, pp. 2430-2447, Oct. 2013. (SCIE-indexed) [pdf]
  • Jaehyun Hwang and Chuck Yoo, "Formula-based TCP Throughput Prediction with Available Bandwidth," IEEE Communications Letters, vol. 14, no. 4, pp. 363-365, Apr. 2010. (SCI-indexed) [pdf]
  • Jaehyun Hwang, See-Hwan Yoo, and Chuck Yoo, "Momentary Recovery Algorithm: A New Look at the Traditional Problem of TCP," IEICE Transactions on Communications, vol. E92-B, no. 12, pp. 3765-3773, Dec. 2009. (SCI-indexed) [pdf]
  • Jaehyun Hwang, Jin-Hee Choi, Se-Won Kim, and Chuck Yoo, "DR-TCP: Downloadable and Reconfigurable TCP," Journal of Systems and Software, vol. 81, no. 1, pp. 83-99, Jan. 2008. (SCIE-indexed) [pdf]

 - Conference and Workshop papers
  • Jaehyun Hwang, Joon Yoo, Sang-Hun Lee, Hyun-Wook Jin, "Scalable Congestion Control Protocol based on SDN in Data Center Networks," in Proc. IEEE Global Communications Conference (GLOBECOM), San Diego, USA, Dec. 2015. [pdf]
  • Jaehyun Hwang and Joon Yoo, "Packet Scheduling for Multipath TCP," in Proc. IEEE International Conference on Ubiquitous and Future Networks (ICUFN), Sapporo, Japan, Jul. 2015. (invited paper) [pdf]
  • Nakjung Choi, Jeongran Lee, and Jaehyun Hwang, "Scalable and Energy Efficient WiFi Management," in Proc. IEEE International Conference on Consumer Electronics (ICCE), Las Vegas, USA, Jan. 2014. [pdf]
  • Jaehyun Hwang, Nakjung Choi, Junghwan Lee, and Chuck Yoo, "SVC-based Hybrid Video Streaming in Mobile CE Devices," in Proc. IEEE International Conference on Consumer Electronics (ICCE), Las Vegas, USA, Jan. 2014. [pdf]
  • Jaehyun Hwang, Joon Yoo, and Nakjung Choi, "IA-TCP: A Rate Based Incast-Avoidance Algorithm for TCP in Data Center Networks," in Proc. IEEE International Conference on Communications (ICC), Ottawa, Canada, Jun. 2012. [pdf]
  • Jaehyun Hwang, See-Hwan Yoo, and Chuck Yoo, "TCP Feno: Enhancement for Higher Accuracy of Loss Differentiation Over Small Buffer Heterogeneous Networks," in Proc. IEEE Conference on Local Computer Networks (LCN), Zurich, Switzerland, Oct. 2009. [pdf]
  • Jaehyun Hwang, Jin-Hee Choi, Se-Won Kim, and Chuck Yoo, "DR-TCP: Downloadable and Reconfigurable TCP," poster session, USENIX Annual Technical Conference (USENIX ATC), San Jose, USA, Jun. 2007. [pdf]
  • Se-Won Kim, Jaehyun Hwang, Jin-Hee Choi, and Chuck Yoo, "Sentry: a Binary-Level Interposition Mechanism for Trusted Kernel Extension," in Proc. IEEE International Conference on Computer and Information Technology (CIT), Seoul, Korea, Sep. 2006. [pdf]
  • Jaehyun Hwang, Jin-Hee Choi, and Chuck Yoo, "A Decision Maker for Transport Protocol Configuration," in Proc. International Conference on Computational Science (ICCS), Reading, UK, May 2006. [pdf]
  • See-Hwan Yoo, Jin-Hee Choi, Jaehyun Hwang, and Chuck Yoo, "Eliminating the Performance Anomaly of 802.11b," in Proc. International Conference on Networking (ICN), Reunion Island, France, Apr. 2005. [pdf]

Internet-Draft (IETF)

 - Domestic (Korean) Journal & Conference papers & Articles
  • 최낙중, 황재현, "네트워크 기능 가상화/소프트웨어 정의 네트워킹 기반 가상 EPC 도입 및 진화," KNOM Review, 제 17권, 제 2호, pp. 34-46, Dec. 2014. [pdf]
  • 고한얼, 이재욱, 백상헌, 황재현, "Multipath TCP (MPTCP) 표준화 및 기술개발 동향", 한국통신학회지: 정보와 통신, 제 31권, 제 9호, Sep. 2014. [pdf]
  • 황재현, "IETF MPTCP WG 표준화 동향", IETF미러포럼-기술분석보고, Korea IETF Forum (K-IETF), Sep. 2014. [doc]
  • 최낙중, 황재현, "콘텐트 중심 네트워크에서의 적응적 비디오 스트리밍," 한국통신학회지: 정보와 통신, 제 30권, 제 3호, pp. 73-79, Mar. 2013. [pdf]
  • 이신형, 황재현, 유혁, "가상 네트워크를 위한 젠 기반 가상 라우터 설계," 한국정보처리학회 추계학술발표대회, Nov. 2010.
  • 이태훈, 황재현, 유시환, 유혁, "멀티 인터페이스를 가진 이동 단말을 위한 다중 동시 전송 TCP의 구조 제안," 대한임베디드공학회 추계학술대회, Nov. 2009.
  • 황재현, 유시환, 유혁, "작은 버퍼 네트워크 환경을 위한 손실 구분 알고리즘," 한국컴퓨터종합학술대회, Jul. 2009.
  • 황재현, 유혁, "TCP 선택을 위한 자동 적응 프레임워크," 한국통신학회 논문지, 제 34권, 제 2호, pp. 130-142 , Feb. 2009. [pdf]
  • 황재현, 유시환, 유혁, "SACK을 이용한 TCP의 효율적인 손실 복구 기법," 한국정보과학회 추계학술대회, Oct. 2008.
  • 황재현, 유시환, 유혁, "TCP의 수동적 네트워크 용량 측정을 위한 지연 패킷 페어 기법," 한국컴퓨터종합학술대회, Jul. 2008.
  • 황재현, 김세원, 유혁, "TCP의 동적 적응 프레임워크," 한국컴퓨터종합학술대회, Jun. 2007.
  • 황재현, 최진희, 김세원, 유혁, "TCP의 동적 적응을 위한 결정 메커니즘," 한국컴퓨터종합학술대회, Jun. 2006.
  • 김세원, 황재현, 유혁, "Sentry: Kernel Extension을 위한 바이너리 수준의 인터포지션 기법," 한국컴퓨터종합학술대회, Jun. 2006.
  • 황재현, 최진희, 김세원, 유혁, "Downloadable TCP의 설계 및 구현," 한국정보과학회 추계학술대회, Nov. 2005.
  • 황재현, 유혁, "컨텐츠 기반 네트워크를 위한 효율적인 라우팅 기법," 한국정보과학회, Oct. 2004.
  • 황재현, 유혁, "이동 애드 혹 네트워크에서 RTT에 영향을 주는 요인에 대한 분석," 한국정보처리학회 춘계학술대회 논문집, 제 11권, 제 1호 , May 2004.
  • 유시환, 황재현, 유혁, "모바일 컴퓨팅: 서비스와 기반 기술을 통한 패러다임의 변화," 대한의료정보학회지, 제 10권, 제 1호, pp. 1-16, 2004.

 - Presentations & Invited Talks
  • Anwar Walid, Qiuyu Peng, Jaehyun Hwang, Steven H. Low, "Balia (Balanced linked adaptation): A new MPTCP congestion control algorithm," IETF-90 Multipath TCP Working Group, Toronto, Canada, Jul. 2014.
  • Jaehyun Hwang, "Deadline and Incast Aware TCP for Data Center Networks," Research Talk, Bell Labs (Murray Hill), New Jersey, US, Nov. 2013.
  • Jaehyun Hwang, "Supporting Service Level Agreements of Cloud Services in Data Center Networks," 5G: Enabling Technologies & Services Workshop, Korea University, Seoul, Korea, Sep. 2013.
  • Jaehyun Hwang, "Efficient Transport Protocol for Data Center Communications," KREONET Workshop, Jeju Island, Korea, Jun. 2013.
  • Jaehyun Hwang, "Data Center Communications and a New Transport Protocol," Data in 21st Century Workshop, Korea University, Seoul, Korea, Sep. 2012.
  • Jaehyun Hwang, "HTTP Adaptive Streaming over Content-Centric Networking," Symposium on Virtualization Technology, Korea University, Seoul, Korea, Jun. 2011.

 - Technical memorandums
  • Jaehyun Hwang and Joon Yoo, "Scalable Congestion Control Protocol for Bursty Flows in Data Center Networks," Alcatel-Lucent, Tech. Memo. ITD-13-54470G, Oct. 2013.
  • Jaehyun Hwang, Nakjung Choi, Matteo Varvello, and Steven Benno, "Empirical Evaluation of Adaptive Video Streaming over Information-Centric Networking," Alcatel-Lucent, Tech. Memo. ITD-12-51613B, Apr. 2012.

 - Patents
  • Youngsung Kho, Jaehyun Hwang, Joonseo Lee, Moonyoung Jeong, Kyuho Han, "Apparatus and Method for Switching Radio Access Technology in Wireless Communication System (무선 통신 시스템에서 무선 접속 기술을 스위칭하기 위한 장치 및 방법," Korean Patent Application filed, No. 10-2018-0027576, Mar. 08 2018. [google_patents]
  • Moonyoung Jeong, Youngsung Kho, Jaehyun Hwang, Joonseo Lee, Kyuho Han, "Method, Apparatus and System for Establishing a Session for Communication with a Local Network in Wireless Communication System," Korean Patent Application filed, No. 10-2018-0011409, Jan. 30 2018. [google_patents]
  • Youngjoong Mok, Chiwoo Lim, Jin Park, Kangeun Lee, Giwon Lee, Jaehyun Hwang, Hyunjeong Kang, "Method and Apparatus for Beam Searching based on History (히스토리 기반 빔 탐색 방법 및 장치)," Korean Patent Application filed, No. 10-2017-0140765, Oct. 27 2017. [google patents]
  • Namkoo Kang, Giwon Lee, Jaehyun Hwang, Jin Park, Kangeun Lee, Chiwoo Lim, "Device and method for beam management in wireless communication system," PCT Application filed, PCT/KR2018/004688, Dec. 15 2017. [google patents]
  • Hakyung Jung, Junghwan Lim, Youngsuk Sun, Jinhyoung Kim, Jaehyun Hwang, Hyunjoo Lee, Sooyoung Jang, Giwon Lee, Jinho Lee, "TCP Proxy Device-Assisted Communication Method and Apparatus in Wireless Communication," US Patent Application filed, US15/982,695, May. 17 2018. [google_patents]
  • Hakyung Jung, Jinhyoung Kim, Sangkyu Baek, Giwon Lee, Jinho Lee, Hyunjoo Lee, Sooyoung Jang, Jaehyun Hwang, "Method and Apparatus for Transmitting TCP ACK in Communication System," US Patent Application filed, US16/009,872, Jun. 15 2018. [google_patents]
  • Jaehyun Hwang, Seongryong Kang, Daejoong Kim, Sangheon Lee, "Method and Apparatus for Packet Splitting over Multiple Links in Mobile Cellular Networks," PCT Application filed, PCT/KR2018/004688, Apr. 23 2018. (priority date: Apr. 21 2017) [google_patents]
  • Seongryong Kang, Jaehyun Hwang, Daejoong Kim, Sanghun Lee, "Method and apparatus for transmitting and receiving data using multilinks in wireless communication system," PCT Application filed, PCT/KR2017/007352, Jul. 10 2017. (priority date: Jul. 11 2016) [google patents]
  • Kyuho Han, Seongryong Kang, Daejoong Kim, Sangheon Lee, Jaehyun Hwang, "Gateway, network assignment method of gateway, mme, network assignment method of mme, terminal, and network connection method of terminal in wireless communication system," US Patent Application filed, US15/720,700, Sep. 29 2017. [google patents]
  • Jaehyun Hwang, Seongryong Kang, "Method and apparatus for transmitting data in wireless communication system", PCT Application filed, PCT/KR2017/007514, Jul. 13 2017. (priority date: Jul. 28 2016)  [google patents]
  • Seongryong Kang, Jaehyun Hwang, Jonghyune Kim, Jungah Choi, "Method and apparatus for controlling the data rate", PCT Application filed, PCT/KR2017/007429, Jul. 12 2017. (priority date: Jul. 14 2016) [google patents]
  • Jaehyun Hwang and Thierry Klein, "Software Defined Networking Based Congestion Control," US Patent granted, US9,450,884, Sep. 20 2016. [google patents]
  • Junghwan Lee, Jeamin Lim, Jaehyun Hwang, Nakjung Choi, Chuck Yoo, "Method for Receiving Adaptive Streaming Service (적응형 스트리밍 서비스를 수신하는 방법)," Korean Patent granted, No. 10-1654898, Aug. 31 2016. [google patents]
  • Jaehyun Hwang and Joon Yoo, "A Method for Avoiding Network Congestion and an Apparatus Thereof," US Patent granted, US9,356,878, May 31 2016. [google patents]
  • Jaehyun Hwang and Anwar Walid, "Fast Coupled Retransmission for Multipath Communications", US Patent granted, US10,020,918, Jul. 10 2018. [google patents]
  • Jaehyun Hwang, "Aggregator Server in a Data Center Network (데이터 센터 네트워크의 집합자 서버)," Korean Patent Application filed, No. 10-2013-0076017, Jun. 28 2013. [google patents]
  • Chuck Yoo, Jaehyun Hwang, Se-Won Kim, Jin-Hee Choi, "TCP Processing System and Method of Controlling The Same (티씨피 처리 시스템 및 그 제어방법)," Korean Patent granted, No. 10-0914308-0000, Aug. 20 2009. [google patents]