Faculty appointment
Assistant Professor
Div. of Computer Engineering
Appointment
Sep.
2026
2026
Effective September 2026
2026.09 — PresentAcademic curriculum vitae
Joonsu Ryu, Ph.D.
Assistant Professor Computer Engineering
Biography
Joonsu Ryu is an Assistant Professor (tenure-track) in the Division of Computer Engineering at Korea Cyber University. His research focuses on secure and intelligent wireless networking, including data-driven routing, reinforcement learning, game theory, and trust-based security for decentralized wireless systems. He received a B.S. with a double major in Mathematics and Computer Science & Engineering and a Ph.D. in Computer Science & Engineering, both from Sogang University. Before joining Korea Cyber University, he taught computer science and related courses at Sungshin Women’s University, Hansung University, Chung-Ang University, Dongguk University, and Ewha Womans University.
Connect
Research conversations, teaching, and collaboration.
Research focus
Building networks that remain intelligent under attack.
Secure & Intelligent Routing
Wireless Network Security
Reinforcement Learning
Game Theory
Trust & Reputation Systems
Appointment
Education
Doctor of Philosophy
Computer Science & Engineering
Sogang University
- Dissertation
- Defense Mechanisms against Routing Attacks in Wireless Networks using Reinforcement Learning and Game Theory View dissertation ↗
- Advisor
- Prof. Sungwook Kim Network Lab ↗
Bachelor of Science
Mathematics
Sogang University
- Double major
- Computer Science & Engineering
Publications
Journal articles
Published · 3-
Mitigating Jamming Attacks in Underwater Sensor Networks Using an M-Qubed-Based Opportunistic Routing Protocol
Joonsu Ryu and Sungwook Kim, “Mitigating Jamming Attacks in Underwater Sensor Networks Using an M-Qubed-Based Opportunistic Routing Protocol”, ETRI Journal, vol. 47, no. 3, pp. 559-571, 2025.
Read paper -
Trust System- and Multiple Verification Technique-based Method for Detecting Wormhole Attacks in MANETs
Joonsu Ryu and Sungwook Kim, “Trust System- and Multiple Verification Technique-based Method for Detecting Wormhole Attacks in MANETs”, IEEE Access, vol. 12, pp. 16266-16275, 2024.
Read paper -
Reputation-Based Opportunistic Routing Protocol Using Q-Learning for MANET Attacked by Malicious Nodes
Joonsu Ryu and Sungwook Kim, “Reputation-Based Opportunistic Routing Protocol Using Q-Learning for MANET Attacked by Malicious Nodes”, IEEE Access, vol. 11, pp. 47701-47711, 2023.
Read paper
Conference papers
Proceedings · 5-
Detection of Wormhole Attacks in Mobile Ad-hoc Network Using Multi-Validation Techniques
Joonsu Ryu and Sungwook Kim, “Detection of Wormhole Attacks in Mobile Ad-hoc Network Using Multi-Validation Techniques”, IEIE Conference, pp. 2038-2041, June 2023 (in Korean).
Details -
Energy Level based D2D Routing Algorithm By using the Reinforcement Learning Approach
Joonsu Ryu and Sungwook Kim, “Energy Level based D2D Routing Algorithm By using the Reinforcement Learning Approach”, IEIE Conference, pp. 744-746, June 2022 (in Korean).
Details -
Multi-hop Routing Method based on Reinforcement Learning for Efficient Data Offloading
Joonsu Ryu and Sungwook Kim, “Multi-hop Routing Method based on Reinforcement Learning for Efficient Data Offloading”, IEIE Conference, pp. 687-689, August 2020 (in Korean).
Details -
Finding the Influential Node set Using Reinforcement Learning in Social Networks
Joonsu Ryu and Sungwook Kim, “Finding the Influential Node set Using Reinforcement Learning in Social Networks”, IEIE Conference, pp. 1064-1065, June 2018 (in Korean).
Details -
A Study on the Influential Maximization Problem on Real-Time Dynamic Social Networks
Joonsu Ryu and Sungwook Kim, “A Study on the Influential Maximization Problem on Real-Time Dynamic Social Networks”, KIISE Conference, pp. 1200-1202, December 2017 (in Korean).
Details
Teaching
Faculty teaching
From Sep. 2026Assistant Professor
Korea Cyber University
2026.09 — Present
- Cloud Security; Introduction to Internet of Things
Lecturer appointments
2023 — 2026
Lecturer
Ewha Womans University
2025.09 — 2026.08
- Discrete Mathematics
- Computer Programming & Labs; Java Programming & Labs
- Computer Programming & Labs
Lecturer
Dongguk University
2024.09 — 2026.08
- Discrete Mathematics
- Object-Oriented Programming
- Object-Oriented Programming
- Programming Languages
Lecturer
Chung-Ang University
2024.09 — 2026.08
- Basic Computer Programming; Algorithm
- Programming Languages
- Basic Computer Programming
- Programming Languages; Programming
Lecturer
Hansung University
2024.03 — 2026.08
- Computer Programming
- Computer Programming
- Computer Programming
- Computer Programming
- Computer Programming
- Computer Programming
Lecturer
Sungshin Women's University
2023.09 — 2026.08
- Computer System Administration; Java Programming
- Computer System Administration
- Python Programming for Scientists
- Java Programming
- Programming Languages
Teaching assistant & mentoring
2015 — 2023Sogang University
Head Teaching Assistant, Sogang University
Dept. of Computer Science & Engineering
Led and managed a team of teaching assistants, coordinated grading, and oversaw student support.
Soongmoon High School
AI Program Mentor, Soongmoon High School
Student research mentoring
Mentored high-school students participating in an AI program and guided them in developing research plans based on their submitted project proposals.
Sogang University
Teaching Assistant, Sogang University
Dept. of Computer Science & Engineering
Assisted with grading assignments and exams and held office hours to answer student questions in C Programming, Data Structures, Design and Analysis of Algorithms, Computer Networks, and related courses.
Awards & Honors
Paper distinction
LG Electronics Paper Award for Outstanding Research
Conference of the Institute of Electronics and Information Engineers (IEIE) · June 2022
Paper distinction
Outstanding Paper Award
Conference of the Institute of Electronics and Information Engineers (IEIE) · June 2018
Languages
Korean
Native
English
Intermediate
Japanese
Intermediate