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A Brief Summary on Research Activities. Cao, Jun Korea University Advisor: Prof. Wonjun Lee 2010.11.07. Contents. Curriculum Vitae Research Summary Master Thesis Other Projects Conclusion. Curriculum Vitae. Family Parents (Beijing, China) Education

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a brief summary on research activities

A Brief Summary on Research Activities

Cao, Jun

Korea University

Advisor: Prof. Wonjun Lee

2010.11.07

contents
Contents
  • Curriculum Vitae
  • Research Summary
  • Master Thesis
  • Other Projects
  • Conclusion
curriculum vitae
Curriculum Vitae
  • Family

Parents (Beijing, China)

  • Education

2000.09 – 2003.07 Taiyuan No.5 School, Shanxi Province, PRC

2004.03 – 2005.02 Korean language course, Hongik University

2005.03 – 2009.02B.S., Korea University

2009.03 – 2011.02M.S., Korea University

  • Internship

2007.07 – 2009.02 Network Lab., Korea University

2007.01 – 2007.02 SK Corporation

2006.07 – 2006.08SK Telecom

curriculum vitae1
Curriculum Vitae
  • Graduate Information

Network Lab. Department of Computer Science and Engineering

Advisor: Prof. Wonjun Lee

    • Research topics
      • IEEE 802.11, WLAN
      • Wireless Mesh Network
      • Medium Access Control
      • Routing in Wireless Ad Hoc Network
      • Distributed Computing
    • Master Thesis

A simple Distributed Dynamic Set Scheme for Exposed Terminal Problems

research summary
Research Summary
  • Projects

2007.09 – 2009.02 (인턴)

      • Sponsor: ITRC-HCI,IITA (정보통신연구진흥원)
      • Topic: Communication protocol for HCI applications

2009.03 – 2010.02 (석사 1년)

      • Sponsor: KOSEF (한국과학재단)
      • Topic: Topology control using cooperative communication

2010.03 – 2011.02 (석사 2년)

      • Sponsor: KRF (한국학술진흥원)
      • Topic: Packet scheduling in relay assistant networks
1 st year internship
1st Year, Internship
  • Topic: Communication protocol for HCI applications
  • Activity: Wireless Mesh Network test-bed construction
  • Setup Phase
    • Server
      • Linux server edition
    • Embedded router
      • Routing, Interface
    • Analysis tools
      • Traffic generator
      • Traffic dumping
  • Testing examples
    • Routing path selection
    • Handoff
    • Channel assignment

Wired backbone

(for administration purpose)

Wireless backbone 802.11a

master course 1 st year
Master course 1st year
  • Topic :Topology control using cooperative communication
  • Cooperative comm. for coverage extension
  • Disconnected topology in wireless networks

ISSUE:

How to select the minimal set of links while maximizing connectivity?

master course 1 st year1
Master course 1st year
  • Solution
    • Step 1: clustering and selecting headers
    • Step 2: greedy algorithm to add links until requirement is reached
master course 2 nd year
Master course 2nd year
  • Topic: Packet Scheduling in Relay Assistant Networks

ISSUE

How to schedule relays in a balance way?

Relay assistant

networks

  • Solution
  • Each relay is assigned with a relaying probability.
  • The relaying probability is inverse proportional to
  • its traffic loadK.
  • By setting the expect number of relaying to 1,
  • each relay solve the equation to get R.
master thesis
Master Thesis
  • Topic: Spatial reuse and exposed terminal problem

ISSUE 1

How to identify exposed terminals in distributed way?

ISSUE 2

How to deal with collision?

master thesis1
Master Thesis
  • Solution
    • Issue 1: Identifying exposed nodes

Exposed nodes dynamically join a dynamic set

    • Issue 2: handling collision

Common time stamp for handling concurrent transmission

2

1

other projects
Other Projects
  • Query by humming
    • Course name: 미디어처리 (4학년)
    • 구성: 3명 (UI / Signal Processing / Data structure)
  • *그림인용: http://people.csail.mit.edu/edmond/projects/musicdb/musicdb.pdf
other projects1
Other Projects

A movie

  • User-rate prediction for movies
    • Recommendation system
    • Course name: Algorithm (4학기)
    • 구성: 2명

K Nearest Node clustering

  • 17700 movies with user rates
  • 4400 users

Correlation of rates by common users of any two movie.

other projects2
Other Projects
  • Results: (Input file) Probe.txt

RMSE: 1.29320

RMSE: 1.39235

answer

no matrix shrink

matrix shrink

conclusion
Conclusion
  • Publications
  • TAs