Research Title

Overall Project Title

• Development of Mobility and Connectivity Platform for Autonomous Delivery

Sub-project Title

• Development of Integrated Control System for Multi-mobility and Autonomous Delivery Service Demonstration

Sponsor

• Ministry of Trade, Industry and Energy 

Participating Institutions

• KATECH (lead), Yonsei University, Seoul National University, Minisoft, MondrianAI etc

Research Period

• Total Period: 2023. 04. 01 - 2026. 12. 31

• Participation Period: 2024. 06. 01 - Present

Role

• Practical Manager (Contribution: 50%)     * PI: Prof. Yong Gu Ji

• Conducted during my Ph.D. program at Yonsei University

Keywords

• eHMI, AV–Pedestrian Communication, Pedestrian crossing decision

Research Goal

• The goal of this project is to support safer, more comfortable, and more efficient interactions between mobility systems and pedestrians. In particular, this project explores how external Human–Machine Interfaces (eHMI) can help pedestrians understand the movement and intended path of mobility systems in shared spaces.

Research Introduction

This project investigates eHMI designs that communicate real-time movement information from mobility systems to pedestrians.

Study 1 focuses on movement-state-based eHMI for autonomous vehicles. This study examines how pedestrians’ crossing decisions, measured by Crossing Decision Time (CDT), change depending on the vehicle’s braking intensity.

Study 2 extends this approach to autonomous delivery robots. This study explores path-based eHMI, which communicates the robot’s intended direction or trajectory in real time. The goal is to examine whether such information can reduce pedestrians’ hesitation, uncertainty, and unnecessary pauses when encountering delivery robots.

Together, these studies aim to provide design insights for pedestrian-centered eHMI systems that improve safety, comfort, and interaction efficiency in future mobility environments.

Research Achievements

• Journal

  • Park, J., Jung, S., Kim, N., Kim, T., & Ji, Y. G. (2026). Effects of Autonomous Vehicle Braking Behavior and Kinematic eHMI on Pedestrian Crossing Decisions. International Journal of Human–Computer Interaction, 1-19.

• Conference

  • Park, J., Kim, N., Park, S., Park, G., Jung, S., & Ji, Y. G. (2025). I’m Going to Stop, Will You Cross?: The Impact of Vehicle’s eHMI on Pedestrian’s Decision-Making. In International Conference on Human-Computer Interaction (pp. 181-193). Springer, Cham. (Gothenburg, Sweden) - Oral [PDF]