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Research Interest

Interested in (Internet) Data Science, particularily user behaviors and content propagation in online services. I'm currently interested in user behaviors on online social media. Also, I enjoy collaborative researches with various fields such as journalism, life science, and so on.

Publications

Thanks to my great collaborators

International Conference

  • logo Taejoong Chung, Jinyoung Han, Daejin Choi, Taekyoung Kwon, Jong-Youn Rha, and Hyunchul Kim,
    "Privacy Leakage in Event-based Social Networks: A Meetup Case Study",
    In Proceedings of ACM Conference on Computer-Supported Cooperative Work and Social Computing (CSCW`18), Jersey City, United States, November 2018.
    (acceptance ratio = 105/384 = 27.3%)
  • logo Jiwon Kang, Daejin Choi, Eunil Park, and Jinyoung Han,
    "Understanding Influential Comments in Online Conversations",
    accepted in ACM Conference on Computer-Supported Cooperative Work and Social Computing (CSCW`18) (poster)
  • logo Selin Chun, Daejin Choi, Jinyoung Han, Huy Kang Kim, and Taekyoung Kwon,
    "Unveiling a Socio-Economic System in a Virtual World: A Case Study of an MMORPG",
    In Proceedings of the 2018 World Wide Web Conferenc (WWW) 2018 (Industry Track), Ryon, France, April 2018.
  • Jinyoung Han, Daejin Choi, Jungseock Joo and Chen-Nee Chuah,
    "Predicting Popular and Viral Image Cascades in Pinterest",
    in The 11th International AAAI Conference on Web and Social Media (ICWSM 17'), Montreal, Canada, 2017.
    (acceptance ratio = 50/357= 14.0%)
  • Daejin Choi, Jinyoung Han, Taejoong Chung, Yong-Yeol Ahn, Byung-Gon Chun, Ted "Taekyoung" Kwon,
    "Characterizing Conversation Patterns in Reddit: From the Perspectives of Content Properties and User Participation Behaviors"
    in ACM Conference on Online Social Networks (COSN) 2015, Standford, CA, USA, Nov. 2015.
    (acceptance ratio = 22/82 = 26.8%)
  • Jinyoung Han, Daejin Choi, A-Young Choi, Jiwon Choi, Taejoong Chung, Ted "Taekyoung" Kwon, Jong-Youn Rha, Chen-Nee Chuah,
    "Sharing Topics in Pinterest: Understanding Content Creation and Diffusion Behaviors"
    in ACM Conference on Online Social Networks (COSN) 2015, Standford, CA, USA, Nov. 2015.
    (acceptance ratio = 22/82 = 26.8%)
  • Jinyoung Han, Daejin Choi, Byung-Gon Chun, Ted "Taekyoung" Kwon, Hyun-chul Kim and Yanghee Choi,
    "Collecting, Organizing, and Sharing Pins in Pinterest:Interest-driven or Social-driven?",
    ACM SIGMETRICS, Austin, Texas, USA, Jun. 2014.
    (acceptance ratio = 40/238 = 16.8%)
  • Taejoong Chung, Jinyoung Han, Daejin Choi, Ted "Taekyoung" Kwon, Huy Kang Kim and Yanghee Choi,
    "Unveiling Group Activities in Online Social Games: A Socio-Economic Analysis",
    World Wide Web (WWW) 2014, Seoul, Korea, Apr. 2014.
    (acceptance ratio = 84/650 = 12.9%)

International Journal

  • logo Daejin Choi, Jinyoung Han, Selin Chun, Efstratios Rappos, Stephan Robert, and Ted "Taekyoung" Kwon
    "Bit.ly/practice: Uncovering Content Publishing and Sharing through URL Shortening Services",
    Elsevier Telematics and Informatics, Vol. 35, Issue 5, pp. 1310-1323, DOI:https://doi.org/10.1016/j.tele.2018.03.003, August 2018
  • Jinyoung Han, Daejin Choi, Byung-Gon Chun, Ted "Taekyoung" Kwon, Hyun-chul Kim and Yanghee Choi,
    "Collecting, Organizing, and Sharing Pins in Pinterest:Interest-driven or Social-driven?",
    ACM SIGMETRICS Performance Evaluation Review, Vol. 42, Issue 1, pp. 15-27, Jun. 2014.
    (Proceeding of ACM SIGMETRICS 2014)

Domestic Conference/Journal

  • Daejin Choi, Taekyoung "Ted" Kwon,
    "A Proposal of High-Performance Computing Network Architecture based on Software-Defined Network, Priority-based Flow Control, and RoCE",
    in Proc. of KICS Conference Winter 2018, Korea, Jan. 2018
  • Selin Chun, Daejin Choi, Taekyoung "Ted" Kwon,
    "A Study on Relations of Goods based on Online Purchase Pattern in Open Market",
    in Proc. of JCCI, Sockcho, Korea, April. 2016
  • Donghyun Son, Daejin Choi, Nakjung Choi, Junghwan Song, Taekyoung "Ted" Kwon,
    "Cache-friendly Adaptive Video Streaming Framework Exploiting Regular Expression in Content Centric Networks",
    The Journal of KICS, Vol.40, No.09, August 2015.
  • Donghyun Son, Daejin Choi, Donghyun Kim, Youngbin Im, Jinyoung Han, Ted "Taekyoung" Kwon, and Yanghee Choi,
    "A proposal of the effective 2hash-based data structure for CCN",
    in Proc. of KICS Summer, Jeju Island, Korea, June. 2013.
  • Daejin Choi, Jinyoung Han, Youngbin Im, Ted "Taekyoung" Kwon, Yanghee Choi
    "A Study on the Multi-core based Router for Efficient Parallel Packet Processing,"
    in Proc. of KICS Fall, Seoul, Korea, November. 2012

Patent

  • Ted "Taekyoung" Kwon, Yanghee Choi, Daejin Choi, Youngbin Im, Yoon Kwon, and Junho Suh,
    "Content Routing Method and Architecture",
    (pending, Korean application No. 10-2014-0072835), June, 16, 2014

Talks & Presentations

  • ACM Conference on Online Social Networks (COSN) 15'

    Stanford University, CA, USA

    Nov. 2015


    Characterizing Online Conversations on Reddit:From the Perspectives of Content Properties and User Participation Behaviors

  • AAAI ICWSM 17'

    Montreal, Canada

    May. 2017


    Predicting Popular and Viral Image Cascades in Pinterest

Education

  • 2012.9 - Current

    Ph. D Student

    Seoul National University


    Department of Computer Science and Engineering
    (Advisors: Ted "Taekyoung" Kwon and Yanghee Choi)

  • 2005.3 - 2012.8

    B.S.

    Korea University


    Department of Computer Science
    (Mathematics as minor)

Project Experiences

  • m

    SDN/NFV

    Development of Access Technology Agnostic Next-Generation Networking Technology for Wired-Wireless Converged Networks,
    Sponsored by Institute for Information & communications Technology Promotion (IITP), Korea
    2015.06 - 2020.05

  • a

    Video Streaming

    Design mobile offloading algorithm based on delay-tolerant transmission protocol
    Sponsored by Small and Medium Business Administration (SMBA), Korea, in cooperation with Mavlux
    2015.12. - 2016.11

  • c

    Data Science & Applications

    Research on value creation for online consumers: from the perspectives of needs, corresponding behavior, and privacy leakage
    Sponsored by Seoul National University Big Data Institute
    2015.03. - 2016.02

  • c

    Data Science & Applications

    Study of Efficient Structuring and Displaying Contents based on Relationship among Contents
    Sponsored by Small and Medium Business Administration (SMBA), Korea, in cooperation with Nemolade
    2014.08. - 2015.07

  • d

    Content-Centeric Network

    Study on Application Model of Mobile CCN Service
    Sponsored by Electronics and Telecommunications Research Institute (ETRI), Korea 2013.05 ~ 2013.12

  • d

    Content-Centeric Network

    Design and Implementation of Multi-Core Based Content Routers for Reducing Large-Size Video Traffic
    Sponsored by Small and Medium Business Administration (SMBA), Korea, in cooperation with Cocolink 2012.07 ~ 2014.06

Skills

Quite used to programming with various languages, managing database, and utilizing a variety of platforms

Programming Language : C/C++, Python, Java
Database: Oracle, MySQL, MS-SQL
Statistics: Matlab, R
Platform and Cloud: Android, iOS, Google App Engine (GAE)

Contact

E-mail : djchoi@mmlab.snu.ac.kr
Address : Multimedia & Mobile Communication Lab., School of Computer Science and Engineering, Seoul National University
Office: Building 301, Room 518
Phone: +82-2-880-9147