Interactive Visual Analysis and Data Exploration Research


Lab.: http://ivaderlab.unist.ac.kr/

Open positions) I am looking for motivated undergraduate research interns and graduate students, who will love to design and evaluate novel user interfaces, visualization techniques, interaction methods, and visual analytics systems. If you are interested in researching on human perception, cognition, and interactions (even in VR and AR), email me.

Important! To work with me you should contact me first. Otherwise, your admission might not be guaranteed.

See my calendar to schedule a meeting: http://ivader.unist.ac.kr/my-calendar

Desired programing skills) Any combination of C++, Java,
OpenGL, Unity, Web development (JavaScript, D3.js, WebGL, jQuery, Django, HIghcharts, Raphael, Bootstrap, MongoDB,  ...).

Sungahn Ko (고성안)

Assistant Professor

School of Electrical & Computer Engineering

UNIST (Ulsan National Institute of Science & Technology), Korea


  •  Ph.D. Purdue Univ., 2014
  •  M.S. KAIST, 2008
  •  B.E. Korea Univ., 2006


Research areas

  • Visual analytics (with Machine Learning)
  • Information visualization
  • HCI (Human-Computer Interaction)
  • Big Data Analytics/Data Mining
  • User Interface and Software Design and Evaluation (UX design)
  • Human Perception/Cognitive Science
  • Human Factors in VR/AR

Visualization keywords
*big data, multivariate, multi-dimensional, high-dimensional, spatial, temporal, spatial-temporal, business intelligence, disaster, financial, traffic and movement analysis
, bioinformatics

HCI keywords
user interface design, human (or personal) activity analysis, human perception and pattern recognition ability analysis, human factors in visualization

Office:  Bldg. 106 401-10

Tel: +82 52 217 2161


ITP 701, 703 Engineering Programming (2017 SPR)

CSE 48001 Graphical User Interface Design (2016 Fall)

ECE 524 Software Engineering (2016 Fall)

CSE 24101 Object-oriented programing (2016 SPR)


Kuatbek Mukabak

Juyoung Oh (a research intern at ETRI, 2016/Winter)


Chunggi Lee

Jaesung Lee

Soyeun Lee

Hansol Yoo

Heena Kwag

Daehwa Kim


2017 Undergraduate: Yousang Oh (Samsung Electronics), Hyungmin Kang (Naver LIne), YongSeok Jung (LG Electronics)


*Sungahn Ko, Isaac Cho, Shehzad Afzal, Calvin Yau, Junghoon Chae, Abish Malik, Kaethe Beck, Yun Jang, William Ribarsky, David S. Ebert, "A Survey on Visual Analysis Approaches for Financial Data," Computer Graphics Forum (EuroVis 2016),  35(3):599-617, 2016 [PDF]

*Jiawei Zhang, Benjamin Ahlbrand, Abish Malik, Junghoon Chae, Zhiyu Min, Sungahn Ko and David S. Ebert, "A Visual Analytics Framework for Microblog Data Analysis at Multiple Scales of Aggregation," Computer Graphics Forum (EuroVis 2016) [PDF]

*Junghoon Chae,Ziawei Zhang, Sungahn Ko, Abish Malik, Heather Connell,  David Ebert,  "Visual Analytics for Investigative Analysis of Hoax Distress Calls using Social Media," IEEE International Symposium on Technologies for Homeland Security, 2016 [PDF]

*Sungahnn Ko, Jieqiong Zhao, Jing Xia, Shehzad Afzal, Xiaoyu Wang, Greg Abram, Niklas Elmqvist,, Len Kne, David Van Riper, Kelly Gaither, Shaun Kennedy, William Tolone, William Ribarsky, David S. Ebert, "VASA: Interactive Computational Steering of Large Asynchronous Simulation Pipelines for Societal Infrastructure," IEEE Transactions on Visualization and Computer Graphics (IEEE Vis 2014), 20(12):1853-1862, 2014 [PDF]

*Sungahnn Ko, Shehzad Afzal, Yang Yang, Junghoon Chae, Abish Malik, Yun Jang David Ebert, "Analyzing High-dimensional Multivariate Network Links with Integrated Anomaly Detection, Highlighting and Exploration", IEEE Conference on Visual Analytics Sciences and Technology (IEEE Vis 2014), p83-92, 2014 [PDF]

*Chen, V.Y., Razip, A.M., Ko, S., Qian, C.Z., and Ebert, D.S., "Multi-aspect visual analytics on large-scale high-dimensional cyber security data", Information Visualization, 2013 [PDF]

*Sungahn Ko, Jang, Y., Maciejewski, R., Ebert, D, "MarketAnalyzer: An Interactive Visual Analytics System for Analyzing Competitive Advantage Using Point of Sale Data," Computer Graphics Forum (EuroVis 2016), 31(3):1245-1254, 2012 [PDF]

*Maciejewski, R., Pattath, A., Ko, S., Hafen, R., Cleveland, W., Ebert, D., "Automated Box-Cox Transformations for Improved Visual Encoding," IEEE Transactions on Visualization and Computer Graphics,  2012. [PDF]

*Sungahn Ko, KyungTae Kim, Tejas Kulkarni, Niklas Elmqvist, "Applying mobile device soft keyboards to collaborative multitouch tabletop displays: design and evaluation," Proceedings of International Tabletop Surface,  p130-139, 2011 [PDF]

*KyungTae Kim, Sungahn Ko, Niklas Elmqvist, David S. Ebert, "WordBridge: Using Composite Tag Clouds in Node-Link Diagrams for Visualizing Content and Relations in Text Corpora," HICSS 2011: 1-8 [PDF]

*Man-Keun Seo, Sungahn Ko, Kyu Ho Park, "NLE-FFS: A Flash File System with PRAM for Non-linear Editing," IEEE Transactions On Consumer Electronics, 55(4):2016-2024, 2009 [PDF]

Professional Activities

Paper Reviews:

EG/VGTC Conference on Visualization (EuroVis), 2017

IEEE Pacific Visualization, 2017

IEEE IEEE VIS (VAST), 2016, 2017

IEEE Transactions on Intelligent Transportation Systems, 2016



IEEE Pacific Visualization 2017, Sponsorship chair & Visualization Notes Committee


UNIST ECE: http://ece.unist.ac.kr/

UNIST Address: 401-10, Bldg. 106, 50, UNIST-gil, Ulsan 44919, Republic of Korea.

우편번호 44919, 울산광역시 울주군 언양읍 유니스트길 50, 울산과학기술원, 106동 401-10