SE GI HONG

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09/2007 ~ Present
PBS (Permission-Based Sending) Project
Columbia University

• Signaling architecture for network traffic authorization.
• Preventing denial-of-service attacks and other forms of unauthorized traffic.
• Exploiting control plane signaling protocol architecture and secure authorization (permission).

• Se Gi Hong and Henning Schulzrinne, “PBS NSLP: Network Traffic Authorization”, IETF, Internet Draft, May 2009, work in progress.

06/2007 ~ 08/2007
Evaluation of a DHT-based P2P System
Bell Labs at Alcatel-Lucent (Summer Internship)

• Evaluated the control message overhead needed to maintain the DHT-based system and stabilization of the system under various churn rates and networking sizes.
• Simulated this project using OMNeT++ and OverSim.

• Se Gi Hong, Volker Hilt, and Henning Schulzrinne, “Evaluation of Control Message Overhead of DHT-based P2P System”, Bell Labs Technical Journal (BLTJ), Vol. 13, No. 3. 

01/2006 ~ 05/2007
7DS Project
Columbia University

    Measurements of Multicast Service Discovery

• Measured and analyzed multicast service discovery traffic in a campus wireless network.
• Analyzed different service discovery delay models in terms of packet overhead and service discovery delay under different network sizes and mobilities.

    Accerelating Service Discovery

• Proposed and algorithm to accelerate service discvory in wireless Zero Configuration Networking (Zeroconf) mobile ad hoc networks.
• Allowed users to discover network topology changes and new services in real-time while minimizing network overhead.
• Implemented and tested this project on Linux, using C.

    P2P Information Exchange

• Worked on data exchanges on wireless mobile ad hoc networks by providing an application-level set of protocol services that will enable exchange of information between peer devices. 
• Implemented and tested this project on Linux using C, and also implemented and tested it using LEAF (Linux Embedded Application Firewall), an embedded Linux distribution, on a WRAP (Wireless Router Application Platform).

    Publication

• Se Gi Hong, Suman Srinivasan and Henning Schulzrinne, “Measurements of Multicast Service Discovery in a Campus Wirless Network”, Columbia University Technical Report, cucs-050-08.

• Se Gi Hong, Suman Srinivasan and Henning Schulzrinne, “Accelerating Service Discovery in Ad-hoc Zero Configuration Networking”, In Proceeding of IEEE Conference on Global Communications (GLOBECOM), Washington D.C., Nov. 2007. [pdf]

• Suman Srinivasan, Arezu Moghadam, Se Gi Hong and Henning Schulzrinne, “7DS - Node Cooperation and Information Exchange in Mostly Disconnected Networks”, In Proceeding of IEEE International Conference on Communications (ICC 2007), Glasgow, Scotland, June 24 - 28, 2007. [pdf]

01/2004 ~ 12/2005
The Armstrong Project
Columbia University

    Funneling-MAC protocol

• Worked on a localized and sink-oriented MAC protocol in wireless sensor networks, focusing on congestion control and aggregation of information. 
• Wrote a C++ code of this protocol and tested it on NS-2 simulator.

    Pulication

• Gahng-Seop Ahn, Emiliano Miluzzo, Andrew T. Campbell, Se Gi Hong and Francesca Cuomo, "Funneling-MAC: A Localized, Sink-Oriented MAC For Boosting Fidelity in Sensor Networks", In Proc. of Fourth ACM Conference on Embedded Networked Sensor Systems (SenSys 2006), Boulder, Colorado, USA, Nov. 1-3, 2006. [pdf]