Sehyun Ryu

Research Interests

My research focuses on system-level design of wireless communication under practical constraints such as latency, limited observability, and signaling overhead, with selective use of machine learning where it is effective.

My research interests include:

• Channel prediction and estimation in modern wireless communication systems

•  AI-based optimization of CSI feedback overhead under limited signaling resources

• Digital twin-based environments for AI-RAN training and realistic CSI data generation

More broadly, I am interested in designing communication infrastructure that supports scalable and efficient machine intelligence in large-scale networks.

Papers

Preprints

[P1] Minjae Lee, Sehyun Ryu, Hosung Joo, Seungmin Choi, and Hyun Jong Yang*, "Importance-Aware CSI Feedback with Adaptive Latent Truncation," submitted to IEEE Transactions on Vehicular Technology, 2026.

[P2] Hyun Jong Yang, Howon Lee*, Kyuhong Shim, Jeongho Kwak, Hyunsoo Kim, Donghoon Kim, Sehyun Ryu, Jaehyun Choi, Youbin Kim, Chanjun Moon, Michael Ryoo, and Byonghyo Shim*, "Advancing Multi-Robot Networks via MLLM-Driven Sensing, Communication, and Computation: A Comprehensive Survey," submitted, 2025.

[P3] Hosung Joo‡, Seungmin Choi‡, Sehyun Ryu, and Hyun Jong Yang*, "Compressed-CSI Feedback with Near Real-time Domain Adaptation," submitted to IEEE Transactions on Communications, 2025.

[P4] Sehyun Ryu and Hyun Jong Yang*, "Blockage-Aware Multi-RIS WSR Maximization via Per-RIS Indexed Synchronization Sequences and Closed-Form Riemannian Updates," arXiv, 2025.

[P5] Hyeonsu Lyu, Jonggyu Jang, Sehyun Ryu, and Hyun Jong Yang*, "Deeper Understanding of Black-box Predictions via Generalized Influence Functions," arXiv, 2024.

International Journals

[J4] Sehyun Ryu*, "From Isolated to Interconnected: An Evolutionary Psychological Account of Artificial Othering and a Design Paradigm to Preserve Human Social Cohesion," in AI and Ethics (Springer Nature), accepted, 2026.

[J3] Sehyun Ryu and Hyun Jong Yang*, "Standards-Compliant DM-RS Allocation via Temporal Channel Prediction for Massive MIMO Systems," in IEEE Transactions on Vehicular Technology, accepted, 2026, doi: 10.1109/TVT.2026.3654149.

[J2] Seungmin Choi‡, Hosung Joo‡, Sehyun Ryu, Tommaso Melodia, and Hyun Jong Yang*, "Performance-Guaranteed CSI Feedback via Model-Free Incremental Residual Compression Framework," in IEEE Wireless Communications Letters, 2025, vol. 15, pp. 880-884, doi: 10.1109/LWC.2025.3624978.

[J1] Sehyun Ryu‡, Jonggyu Jang‡, and Hyun Jong Yang*, "Noise Variance Optimization in Differential Privacy: A Game-Theoretic Approach Through Per-Instance Differential Privacy," in IEEE Access, vol. 12, pp. 103104-103118, 2024, doi: 10.1109/ACCESS.2024.3433440.

International Conference Proceedings

[C2] Jaehyun Choi, Sehyun Ryu, Seungmin Choi, and Hyun Jong Yang*, "RT-AUGGAN: Robust Fingerprint Positioning under Environmental Variations via Ray Tracing-Assisted GAN Augmentation," IEEE International Conference on Consumer Electronics-Asia (ICCE-Asia) 2025.

[C1] Sehyun Ryu, Hosung Joo, Jonggyu Jang, and Hyun Jong Yang*, "Instance-Wise Laplace Mechanism via Deep Reinforcement Learning," AAAI 2024 (Student Abstract and Poster Program) [Oral Presentation].

Korean Domestic Papers

[D4] Sehyun Ryu and Hyun Jong Yang*, “A Survey of the Application of Ray-Tracing-Based Channel Modeling for Digital Twin Environments,” Winter Conference of KICS, 2026.

[D3] Sehyun Ryu and Hyun Jong Yang*, "Trends in Utilizing Generative Models for Wireless Communications," KICS Information and Communications Magazine, 2024.

[D2] Sehyun Ryu and Hyun Jong Yang*, "Research Trends of Deep Learning-Based Algorithms for Reduced CSI Feedback Overhead," Joint Conference on Communications and Information (JCCI), 2024.

[D1] Sehyun Ryu and Hyun Jong Yang*, “Additive Machine Unlearning Algorithm Using Orthogonality,” Summer Conference of KICS, 2023.

Patents

1. "Data Augmentation Method for Indoor Positioning based on Wireless Channel State Information and Computer Device Thereof," Hyun Jong Yang, Jaehyun Choi, Seungmin Choi, and Sehyun Ryu, KR 10-2026-0012777 (filed).

2. "Method and Apparatus for Channel Prediction-Based Rerference Signal Allocation in Massive MIMO Wireless Communication System," Hyun Jong Yang and Sehyun Ryu, KR 10-2025-0214422 (filed).

3. "Method for Channel State Information(CSI) Feedback Using Multi-Stage Residual Compression and User Equipment Performing the Same," Hyun Jong Yang, Seungmin Choi, Sehyun Ryu, and Hosung Joo, KR 10-2025-0202288 (filed).

4.  "Apparatus and Method for Providing Statistical Data," Hyun Jong Yang, Sehyun Ryu, and Jonggyu Jang, KR 10-2024-0143784 (filed).

5.  "Electronic Device for Deriving Influence Function," Hyun Jong Yang, Hyunsu Lyu, Jonggyu Jang, and Sehyun Ryu, KR 10-2024-0045157 (filed).

Experience

Education

Academic Services

• Journal Reviewer

  • IEEE Transactions on Information Forensics & Security.

  • IEEE Wireless Communications Letters.

  • The Journal of Korean Institute of Communications and Information Sciences.

• Conference Reviewer

  • IEEE Consumer Communications & Networking Conference (2024, 2025).

• Technical Program Committee

  • KICS International Conference on ICT Convergence (2025).

• Conference Assistant

  • IEEE/IEIE International Conference on Consumer Electronics Asia (2025).

Honors and Awards

• Grand Prize, New Industry Sector Ideas and Patent Rights Competition, Korea Invention Promotion Association, 2024.

• Excellence Award, Undergraduate Group Research Program (UGRP), POSTECH, 2019.

• Jigok Scholarship: Full funding for tuition, POSTECH, Mar. 2018 - Feb. 2023.

Research Projects

• Research Assistant, “Development of a 5G-A vRAN Research Platform,” IITP, 12.8B KRW, 2024.06 - 2028.12.

• Research Assistant, “AI-Based CBF Overhead Reduction," Samsung Electronics (S.LSI), 300M KRW, 2024.02 - 2024.08.

• Research Assistant, “Data processing methods and simulated signal generation for artificial intelligence radar data analysis,” ADD, 90M KRW, 2023.10 - 2024.12.