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Eungchang Mason Lee

Ph.D. student in KAIST, South Korea (a.k.a 용산동쌍가락지)

  eungchang_mason@kaist.ac.kr


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Projects

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Laboratory Projects

※ Development of Drone System for Diagnosis of Porcelain Insulators in Overhead Transmission Lines

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  • Supported by KEPCO and KEPRI
  • This project was counducted at Urban Robotics Lab in KAIST: Link
  • I participated in this project during: 2023.01 - 2024.06

　In this project, we develop a autonomous drone manipulation framework for diagnosis of porcelain insulators in transmission lines. We are developing a robust multi-LiDAR SLAM, real-time obstacle avoidance path planner, and adaptive attitude / trajectory tracking controllers.

Keywords: Drone, Quadrotor UAV, Manipulation, Drone Manipulation, Aerial Inspection, Multi-LiDAR SLAM


※ Research of Coverage Path Planner for 3D Reconstruction with UAVs

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  • Supported by Confidential
  • This project was counducted at Urban Robotics Lab in KAIST: Link
  • I participated in this project in 2022

　In this project, we developed a energy-efficient and obstacle-aware coverage path planner for UAVs to accurately reconstruct the target structures with high-resolution. The detailed information is confidential.

Keywords: Drone, Quadrotor UAV, Coverage Path Planning, 3D Reconstruction, Obstacle avoidance, Exploration, SLAM


※ 2022 ADD Autonomous Flight Competition in Battlefield Situations

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　The competition aims to develop an autonomous drone to pass through complex and dangerous outdoor obstacles, infiltrate an unknown two-story building, detect hidden targets, create precise 3D maps including target types and coordinates, and return to the starting point safely. I developed main framework including local/global path planners, 3D map logger with the detected target positions and a decision-making system.

Keywords: Drone, Quadrotor UAV, Competition, Obstacle avoidance, Exploration, Object Detection, SLAM


※ IEEE UAV Competition 2022 - Low Power Computer Vision Challenges (LPCVC): Chase

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  • Hosted by LPCV and IEEE - Link
  • Source code of this project is available at Github
  • This project was counducted at Urban Robotics Lab in KAIST: Link
  • I participated in this project during: 2022.01 - 2022.02

　Low Power Computer Vision Challenges aims to develop light and fast computer vision solutions to be used in many fields including Robotics. In 2022, the goals of the competition was to track the non-uniform motion vehicle at constant distance away with a quadrotor UAV, while avoiding obstacles. We estimated the trajectory of the moving vehicle in the form of 5th order polynomial using the detected center point with YOLO network. Then, Adaptive weight Model Predictive Controller (AMPC) is designed to track the target effectively.

Keywords: Quadrotor, Drone Competition, Target Tracking, Object Detection, Machine Learning, Computer Vision, Path planning


※ Unmanned Swarm CPS Research Lab

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  • Supported by ADD
  • This project was counducted at Urban Robotics Lab in KAIST: Link
  • I participated in this project during: 2021.1 - 2021.12

　In this project, we developed adaptive multi robot localization method. With the high fidelity networking, artificial intelligent cooperative control, and mobile ground control station, unmanned swarm system has been researched to operate cyber-physical systems.

Keywords: Multi-robot systems, Cyber-Physical System, Multi-robot localization, Simultaneously Localization and Mapping


※ Autonomous Drone Navigation for Power Line Inspection in Underground

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  • Supported by KEPCO and KEPRI
  • This project was counducted at Urban Robotics Lab in KAIST: Link
  • I participated in this project during: 2020.8 - 2022.12

　In this project, we developed indoor SLAM, navigation, and exploration method to operate an UAV exploring the underground power line tunnel safely. In consideration with the limited payload and computational resource of the UAV, the precomputed and lightweight local exploration planner was proposed. Additionally, to charge the battery of the UAV on the UGV with the docking station, relative pose estimation EKF and autonomous landing algorithm was developed.

Keywords: Unmanned Aerial Vehicle, Exploration, Structural Inspection, Underground Navigation


※ A Study on the Visual-Inertial Navigation System of Artificial Intelligent Unmanned Aerial Vehicle for Reconnaissance and Exploration

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  • Hosted by ROND in KAIST
  • This project was counducted at Urban Robotics Lab in KAIST: Link
  • I participated in this project during: 2020.5 - 2020.11

　Research on Unmanned Aerial Vehicles has been actively conducted in recent years. In particular, the UAV to explore an unknown, GNSS-denied environment is required, but the self-localization method, such as Visual Inertial Odometry, is mandatory to operate it. Considering the payload and the operating time of the UAV, lightweight and low-power consuming cameras and IMU are preferred, and even Object Detection and 3D Mapping can be obtained using a RGB-D camera. In this work, we developed a 3D Mapping system including object positions in an unknown and GNSS-denied environment for the UAV with a RGB-D camera. The system is demonstrated in Gazebo simulator, and the quantitative and qualitative results are obtained.

Keywords: Unmanned Aerial Vehicle, Visual-Inertial Navigation System, Exploration, Artificial Intelligence


※ 2020 Korea Robot Aircraft Competition

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  • Hosted by MOTIE and KAIA - Link
  • This project was counducted at Urban Robotics Lab in KAIST: Link
  • I participated in this project during: 2020.4 - 2020.11

　Korea Robot Aircraft Competition aims to promote the revival of the domestic aviation industry and respond to various demands, this competition will expand the base of unmanned aviation-related technologies through participation in high school and university (graduate) students, and contribute to discovering and fostering human resources in related industries. The competition has been held every year since 2002 for the purpose of raising awareness of unmanned aerial vehicles (drones) and training manpower through various missions using unmanned aerial vehicles (drones) developed by college students.

Keywords: Quadrotor, Drone Competition, Target Tracking, Object Detection, Machine Learning


※ 2019 AIRR AlphaPilot (Artificial Intelligence Robotic Racing)

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  • Hosted by Lockheed Martin and The Drone Racing League, Supported by NVIDIA
  • This project was counducted at Unmanned Systems Research Group in KAIST: Link
  • I participated in this project during: 2019.3 - 2019.12
  • Relative Media is listed on **About Me**’s Awards

　AlphaPilot is the first large-scale open innovation challenge of its kind focused on advancing artificial intelligence (AI) and autonomy. Supported and hosted by DRL, Lockheed Martin and NVIDIA. For the 1 Million dollar prize only for the winner. The challenge consists of Preliminary test and Real competition. Firstly, DRL and Lockheed martin used FlightGoggles Simulator from MIT to narrow down 424 teams over 81 countries into 9 Qualifiers. Only 9 Qulifiers participated real RACEs using DRL made drone 'RACER AI' which is equipped with RTOS like kernel customized NVIDIA Jetson Xavier and few sensors. Our team won the 3rd prize.

Keywords: Drone, Quadrotor, Autonomous Flying Drones, Drone Racing

FlightGoggles simulator and RACER-AI drone


※ 2018 R-BIZ Challenge Turtlebot3 Autorace

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　ROS based autonomous driving system for mobile robot (Turtlebot3) is developed for finishing the racing track with diverse missions. Using MATLAB, Lyapunov functional is proved to stabilize the error model of mobile robot. Simple HOG based Cascade Object Detector is trained using Computer Vision Toolbox of MatLab and then all systems are coded with Python to control the robot in real-time. Only 35 dollar Raspberry Pi computer was adopted and it was equipped with 1-D LiDAR and mono camera. Our team won the Mathworks Korea Special Prize.

Keywords: Mobile Robots, Autonomous Driving Vehicles, Lyapunov function based Control

Race GIF, Controller design, and Signal&Line detection


※ Research on Multi-Rate Sensor Fusion based Mobile Robot Model Predictive Control System

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　Measured data from Vehicle’s multi sensor system have asynchronized sampling rate, The final goal of this research project is to design multi-rate State Estimator that can assume exact state using asynchronized data. Model based prediction controller is designed to perform at real-time for improving control performance. In addition, ROS based mobile robot data processing system, LiDAR data based path planning, sign recognition algorithm are researched for implementing autonomous system.

Keywords: Sampled-data system, Multi-rate Sampled-data system, Model Predictive Control, Cyber-Physical System

Overall system: Multi-rate Observer, Controller, and results

Technology Transfer

Freelancing

※ KHNP Virtual Robot Challenge 2022

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　KHNP Virtual Robot Challenge aims to develop a autonomous navigation algorithm and a robust controller to complete diverse and challenging tasks including obstacle avoidance, exploration, and enduring the wind disturbances. I made Gazebo maps for the competition and coded scoring GUI. Additionally, I coded sample controllers for the quadrotor UAV.

Keywords: Drone, Quadrotor UAV, Competition, Obstacle avoidance, Exploration, Robust Control, Gazebo, Simulation


※ Palm Tree Field Exploration and Tree Identification with UAV / UGV

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  • Conducted at AKA-AI Robotics
  • I participated in this project during: 2021.11 - 2022.05

　The final goal of this research project is to develop an exploration system for monitoring unknown palm tree orchard environments while avoid‑ ing collisions and figuring out appearances of trees. I developed the whole system including pointcloud data processing, path planning, and controller. A state‑of‑the‑art open‑sourced SLAM algorithm is utilized.

Keywords: UAV, UGV, Exploration, Obstacle avoidance, SLAM, Gazebo, Simulation


※ KHNP Virtual Robot Challenge 2021

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　KHNP Virtual Robot Challenge aims to develop a autonomous navigation algorithm and a robust controller to complete diverse and challenging tasks including obstacle avoidance, manipulation for grasping a cube, climbing stairs, and enduring the disturbances. I made Gazebo maps for the competition and coded scoring GUI. Additionally, I coded sample controllers for the manipulator and the quadruped robot.

Keywords: Quadruped robots, Competition, Obstacle avoidance, Object Detection, Gazebo, Simulation