- Postdoctoral Fellow, Computer Sciences Department, University of Wisconsin – Madison, WI, USA (November 2007 ~ February 2010)
- Advisor: Prof. Suman Banerjee
- Researched and studied the adaptive and intelligent next generation transport protocol for heterogeneous networks.
- Improved TCP performance (e.g. throughput, goodput, fairness, friendliness) in integrated wireless communications networks.
- Studied loss differentiation schemes (e.g. TCP NewReno-LP, JTCP, Jersey, Veno) for TCP over wireless networks.
- Proposed timestamp and congestion level index based available bandwidth estimation scheme.
- Compared various TCP versions (e.g. TCP New Jersey, Westwood, Vegas, Reno) using ns-2 simulator.
- Designed and implemented random simple error model for uncorrelated losses and multi-state error model for correlated losses (e.g. multi-path fading) in NS-2 simulator.
- Ph.D. in Information and Communication Engineering at Sungkyunkwan University, South Korea. (September 2002 ~ February 2006)
- Advisors: Prof. Jinwook Chung, Prof. Seongjin Ahn, and Prof. Jitae Shin
- Thesis title: Controllable Class-based Service Architecture for QoS Differentiation.
- Presented novel service architecture with strong service guarantees and high scalability in IP networks.
- Proposed triple collaboration which consists of major primitives: (1) an active queue management, (2) a scheduling mechanism, and (3) a TCP congestion control scheme.
- Defined and realized of a new service architecture which can offer absolute and relative differentiation of packet delay and loss to traffic classes.
- Demonstrated the effectiveness of the approach through numerical analysis (Queueing theory) and simulation.
- M.S. in Information Engineering at Sungkyunkwan University, South Korea. (March 1995 ~ February 1997)
- Advisor: Prof. Jinwook Chung
- Thesis title: A Study on the Interface Design of Network Traffic Analysis Systems.
- B.S. in Information Engineering at Sungkyunkwan University, South Korea. (March 1991 ~ February 1995)