Seungjoon Lee
Email:		slee[AT]cs.umd.edu

I finished my Ph.D. study in August 2006. After spending 8 years at AT&T Labs Research, I am currently with the Infrastructure team in Two Sigma Investments, LLC.

I am broadly interested in computer networks, cloud computing, large-scale systems, wireless networks, and mobile computing. Here are my publication list and curriculum vitae.

The following is a list of specific areas that I have recently worked on.

• Content Delivery
  A large fraction of today's Internet traffic is due to dissemination of various contents (e.g., videos). I have worked on a wide range of aspects in content delivery systems such as optimal content placement, efficient request routing, and efficient peer-to-peer media streaming.
  Selected papers:
  
  • Optimal VoD Content Placement: [ACM CoNext 2010] [IPCO 2013]
    
  • Request Routing using Anycast: [ACM TWEB 2011]
    
    
• Cloud Computing
  I recently worked on network design for cloud infrastructure, where I designed, implemented, and deployed high-throughput multicast capability, which is essential to the delivery of high-rate financial data, but is not supported in OpenStack. I also have worked on intelligent orchestration of cloud and network infrastructure via load balancing, resource allocation, and live VM-migration.
  Selected papers:
  
  • Mobile Cloud Offloading: [ACM MobiArch 2013]
    
  • Virtual Private Mobile Network: [ACM MCS 2011]
    
  
  
• Core Networks
  I have worked on topology and service path inference for wireless cellular services running on overlays of multiple wide-area networks. The work has become the foundation of a tool used by various cellular service operations groups in AT&T to identify relevant paths for service issue troubleshooting. I am also working on how to utilize SDN (software defined networking) approaches in wide-area network services.
  Selected papers:
  • Path Inference: [IEEE CNSM 2012]
    
  • 3G Hierarchical Routing: [ITC 2011]
    
  
  
• Wireless Networks
  My work in this area spans from wireless link layer to wireless routing. I have performed a detailed study of bit errors in the IEEE 802.11 link layer and proposed an efficient error recovery scheme based on the findings. I also have proposed efficient routing schemes and virtual routing backbone construction schemes in multi-hop settings.
  Selected papers:
  • Wireless Bit Error Pattern and Recovery: [IEEE/ACM ToN 2012] [Usenix NSDI 2010]
    
  • Virtual Routing Backbone Construction: [ACM Sigmetrics 2007]
    

Education

• Ph.D. in Computer Science, University of Maryland, College Park (2006)
  (Advisor: Dr. Bobby Bhattacharjee)
• M.S. in Computer Science, Seoul National University, Seoul, Korea (2000)
• B.S. in Computer Science, Seoul National University, Seoul, Korea (1996)

• IEEE Infocom 2011, 2012, 2013, 2014, 2015
  
• International Teletraffic Congress (ITC) 2013
  
• IEEE International Conference on Network Protocols (ICNP) 2012
  
• IFIP Networking 2012
  
• IEEE LANMAN Workshop 2010, 2011
  
• IEEE SECON (Conference on Sensor, Mesh, and Ad Hoc Communications and Networks) 2008
  

• Content Placement
  U.S. Patent #8,856,846 issued 10/7/2014
  D. Applegate, A. Archer, V. Gopalakrishnan, Seungjoon Lee, K. K. Ramakrishnan
  
  
• Internet Protocol Version 6 Content Routing
  U.S. Patent #8,856,281 issued 10/7/2014
  Jacobus Van der Merwe, Seungjoon Lee, Oliver Spatscheck
  
  
• Multi-Autonomous System Anycast Content Delivery Network
  U.S. Patent #8,607,014 issued 12/10/2013
  Oliver Spatscheck, Zakaria Al-Qudah, Seungjoon Lee, Michael Rabinovich, Jacobus Van der Merwe
  
  
• Anycast Transport Protocol for Content Distribution Networks
  U.S. Patent #8,560,597 issued 10/15/2013
  Oliver Spatscheck, Seungjoon Lee, Michael Rabinovich, Jacobus Van der Merwe
  
  
• Methods And Apparatus To Configure Virtual Private Mobile Networks
  U.S. Patent #8,509,169 issued 08/13/2013
  Jacobus Van Der Merwe, Deepak K. Chawla, Gustavo de los Reyes, Seungjoon Lee
  
  
• Mitigating low-rate denial-of-service attacks in packet-switched networks
  U.S. Patent #8,443,444 issued 05/14/2013
  Jia Wang, Chia-Wei Chang, Seungjoon Lee, Bill Lin
  
  
• Multi-path Load Balancing Using Route Controller
  U.S. Patent #8,175,006 issued 05/08/2012
  Seungjoon Lee, Jacobus Van Der Merwe
  
  
• Method For Encoding Frame Data
  U.S. Patent #7,940,850 issued 05/10/2011
  Lusheng Ji, Samrat Bhattacharjee, Bo Han, Seungjoon Lee, Robert R. Miller
  
  
• Broadcast Latency Optimization In Multihop Wireless Networks
  U.S. Patent #7,903,653 issued 03/08/2011
  Seungjoon Lee, Rajiv Gandhi, Yoo-ah Kim
  
  
• Method And Apparatus For Scheduling Data Packet Transmission Over A Multihop Wireless Backhaul Network
  U.S. Patent #7,366,178 issued 04/29/2008
  Seungjoon Lee, Girija Narlikar, Gordon Wilfong, Lisa Zhang
  
  

Other (Older) Information

• I was member of the NICE project.
  PRM-NICE LINUX code (simple how-to)
  Simulation code
• I integrated the sleep mode operation into the MadWifi driver.
  (The code is not cleaned up, but you are welcome to play with it.)
• I was a member of INC Lab and worked with Prof. Chongkwon Kim.
• Previous Coursework & TA at UMD
• I actively participate in local seminar series: GTRG KGSYS SysChat CSHCN
• I maintain a number of paper lists for my and others' reference.
  k-Connected Subgraphs
  Game theory in wireless networks
  Multi-channel wireless networks
  Power-aware ad hoc networks
  Distributed trust and reputation systems