CV

Last Updated: Aug. 28 2019

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Professional Experiences

Mar. 2025 - present: Assistant Professor at Ewha Womans University.
Sep. 2020 - Feb. 2025: Assistant Professor at Incheon National University.
Feb. 2019 - Aug. 2020: Research Scientist at Georgia Institute of Technology.
(PI: Munmun De Choudhury)
Aug. 2012 - Feb. 2019: Research Assistance at Seoul National University.
(Supervisors: Prof. Ted “Taekyoung” Kwon and Prof. Yanghee Choi )
Aug. 2016 - Dec. 2016: Visiting Researcher at HEIG-VD, Swithzerland.
Aug. 2007 - Jan. 2010: Software Engineer at GameVil Inc.

Education

Ph.D in Electronic Engineering and Computer Science, Seoul National University, 2019.02
- Thesis:”Understanding and Predicting User Behavior and Content Propagation Patterns in Internet: A Data-Scientific Approach”
  Supervisors: Prof. Ted “Taekyoung” Kwon and Prof. Yanghee Choi
B.S. in Computer Science and Engineering (Mathematics as Minor), Korea University, 2012.08

Selected Publications

2025
- “BankTweak: Adversarial Attack against Multi-Object Trackers by Manipulating Feature Banks, “ Woojin Shin, Donghwa Kang, Daejin Choi, Brent Byunghoon Kang, Jinkyu Lee, and Hyeongboo Baek* The 34th International Joint Conference on Artificial Intelligence (IJCAI), 2025 (BK21 Top-tier CS Conference: IF=4.0)
- “Political Bias Prediction Models Focus on Source Cues, Not Semantics, “ Selin Chun, Daejin Choi*, Taekyoung Kwon*, The 39th Annual AAAI Conference on Artificial Intelligence, 2025 (BK21 Top-tier CS Conference: IF=4.0)
2024
- “CURE: Context- and Uncertainty-Aware Mental Disorder Detection, “ Migyeong Kang, Goun Choi, Hyolim Jeon, Jihyun An, Daejin Choi*, Jinyoung Han*, The 2024 Conference on Empirical Methods in Natural Language Processing (EMNLP) (BK21 Top-tier CS Conference: IF=3.0)
- “Predicting Diversification Scores of Videos in Recommendation Network,” Selin Chun, Jinyoung Han, Daejin Choi*, and Taekyoung Kwon*, Expert Systems with Applications (SCIE, JCR 2022 IF=8.5)
2023
- “Supporters First: Understanding Online Social Support from a Supporter Perspective,”
  Meeyun Kim, Koustuv Saha, Munmun De Choudhury, and Daejin Choi*, ACM Conference on Computer-Supportive Cooperative Work and Social Computing (CSCW) (BK21 Top-tier CS Conference: IF=3.0)
Before 2022
- “Preventing Rumor Spread with Deep Learning,”
  Daejin Choi, Hyuncheol Oh, Selin Chun, Taekyoung Kwon, and Jinyoung Han,
  Expert Systems With Applications. Vol. 197, pp. 116688, July, 2022 (SCIE, JCR 2020 IF=6.954)
- “Development of a Machine Learning Model Using Multiple, Heterogeneous Data Sources to Estimate Weekly US Suicide Fatalities,”
  Daejin Choi, Steven A. Sumner, Kristin M. Holland, John Draper, Sean Murphy, Daniel A. Bowen, Marissa Zwald, Jing Wang, Royal Law, Jordan Taylor, Chaitanya Konjeti, Munmun De Choudhury,
  JAMA Network Open, December 2020. (SCIE, JCR 2019 IF = 5.032)
- “Cross-Lingual Suicidal-Oriented Word Embedding toward Suicide Prevention,”
  Daeun Lee, Soyoung Park, Jiwon Kang, Daejin Choi, and Jinyoung Han,
  EMNLP Findings, November 2020.
- “Rumor Propagation is Amplified by Echo Chambers in Social Media”,
  Daejin Choi, Selin Chun, Hyunchul Oh, Jinyoung Han, and Ted “Taekyoung” Kwon,
  Scientific Reports. Vol. 10, Issue 1, pp. 310. Jan. 2020. (DOI:10.1038/s41598-019-57272-3, SCI. IF=4.122)
- “Predicting Content Consumption from Content-to-Content Relationships”,
  Jinyoung Han, Daejin Choi, Taejoong Chung, Chen-Nee Chuah, Hyun-chul Kim, and Ted “Taekyoung” Kwon,
  Elsevier Journal of Network and Computer Applications (JNCA), April 2019. (DOI: 10.1016/j.jnca.2019.01.030)
2018
- “Privacy Leakage in Event-based Social Networks: A Meetup Case Study”,
  Taejoong Chung, Jinyoung Han, Daejin Choi, Taekyoung Kwon, Jong-Youn Rha, and Hyunchul Kim,
  ACM Conference on Computer-Supported Cooperative Work and Social Computing (CSCW`18), Jersey City, United States, November 2018. (acceptance ratio = 105/384 = 27.3%)
- “Understanding Influential Comments in Online Conversations”,
  Jiwon Kang, Daejin Choi, Eunil Park, and Jinyoung Han,
  ACM Conference on Computer-Supported Cooperative Work and Social Computing (CSCW`18), Jersey City, United States, November 2018. (poster)
- “Unveiling a Socio-Economic System in a Virtual World: A Case Study of an MMORPG”,
  Selin Chun, Daejin Choi, Jinyoung Han, Huy Kang Kim, and Taekyoung Kwon,
  International World Wide Web Conferenc (WWW) 2018, Ryon, France, April 2018.
- “Predicting Popular and Viral Image Cascades in Pinterest”,
  Jinyoung Han, Daejin Choi, Jungseock Joo and Chen-Nee Chuah,
  International AAAI Conference on Web and Social Media (ICWSM 17’), Montreal, Canada, 2017.
  (acceptance ratio = 50/357= 14.0%)
- “Characterizing Conversation Patterns in Reddit: From the Perspectives of Content Properties and User Participation Behaviors”,
  Daejin Choi, Jinyoung Han, Taejoong Chung, Yong-Yeol Ahn, Byung-Gon Chun, Ted “Taekyoung” Kwon,
  ACM Conference on Online Social Networks (COSN) 2015, Standford, CA, USA, Nov. 2015.
  (acceptance ratio = 22/82 = 26.8%)
- “Sharing Topics in Pinterest: Understanding Content Creation and Diffusion Behaviors”
  Jinyoung Han, Daejin Choi, A-Young Choi, Jiwon Choi, Taejoong Chung, Ted “Taekyoung” Kwon, Jong-Youn Rha, Chen-Nee Chuah,
  ACM Conference on Online Social Networks (COSN) 2015, Standford, CA, USA, Nov. 2015.
  (acceptance ratio = 22/82 = 26.8%)
- “Collecting, Organizing, and Sharing Pins in Pinterest:Interest-driven or Social-driven?”,
  Jinyoung Han, Daejin Choi, Byung-Gon Chun, Ted “Taekyoung” Kwon, Hyun-chul Kim and Yanghee Choi,
  ACM SIGMETRICS, Austin, Texas, USA, Jun. 2014. (acceptance ratio = 40/238 = 16.8%)
  Also published in ACM SIGMETRICS Performance Evaluation Review, Vol. 42, Issue 1, pp. 15-27, Jun. 2014.
- “Unveiling Group Activities in Online Social Games: A Socio-Economic Analysis”,
  Taejoong Chung, Jinyoung Han, Daejin Choi, Ted “Taekyoung” Kwon, Huy Kang Kim and Yanghee Choi,
  International World Wide Web (WWW) 2014, Seoul, Korea, Apr. 2014. (acceptance ratio = 84/650 = 12.9%)

Patents

Ted “Taekyoung” Kwon, Daejin Choi, Selin Chun, Minhyeok Kang,
“A Long Short Term Memory-based Recurrent Neural Network Method to Predict per-Service Temporal Trac Amount in Data Center”
Korea patent, Pending no. 10-2019-0014970 (Feb. 8, 2019).
Ted “Taekyoung” Kwon, Minkyung Park, Sungmin Sohn, and Daejin Choi,
“Credit-based Multipath Transmission Method for Datacenter Network Load Balancing”
Korea patent, Registraction no. 10-1932138 (Dec. 18, 2018).
Ted “Taekyoung” Kwon, Yanghee Choi, Daejin Choi, Youngbin Im, Yoon Kwon, and Junho Suh, “Content Routing Method and Architecture”
Korea patent, Pending no. 10-2014-0072835 (Jun. 16, 2014).

Talks

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

November 03, 2015

Talk at Stanford University, California, USA

[Conference Talk] Predicting Popular and Viral Image Cascades in Pinterest

May 18, 2017

Tutorial at Montreal, Canada

[Invited Talk] Computational Social Science with Graph Modeling

May 25, 2018

Invited Talk at Hanyang University (ERICA), Ansan, South Korea

[Invited Talk] Data Science & Machine Learning Tutorial

January 22, 2019