Research

Publications

Two first-author papers and one co-authored paper, with original PDFs on PPG/HRV, FMCW cardiac timing, and ultrasound smart mirrors.

Research Topics

Three conference proceedings papers: two as first author and one as third author. HRV-based cognitive-task classification, FMCW cardiac timing, and ultrasound–smart-mirror integration.

Publications and author roles

First page of the CICS’25 conference proceedings paper showing the title and Hyeong-Rok Ryu as first author

First author · 1/3 Conference proceedings Poster Presentation

Conference on Information and Control Systems 2025 · 2025

Published 2025.10.22 · pp. 291–292 · Presented 2025.10.23

Classification of Cognitive Task Performance using HRV Features: A Convolutional Neural Network Approach

Hyeong-Rok Ryu, Woo-seok Kang, Kyung-Ho Kim

This study classifies cognitive task performance from PPG-derived HRV features and evaluates a convolutional neural network approach.

Paper AUC: 0.99
Paper F1-Score: 0.992

First author · Poster preparation · Presentation participation

Publication details Official Conference DBpia Paper Code

The DBpia paper page shows the matching title, authors, and pp. 291–292.

First page of the KIEE 2026 Summer Conference FMCW paper showing the title and Hyeong-Rok Ryu as first author

First author · 1/3 Conference proceedings Poster Presentation

The 57th KIEE Summer Conference 2026 · 2026

Published 2026.07.08 · pp. 2413–2414 · Presented 2026.07.10

Analysis of Aortic Valve Opening and Closure Using Cardiac Signals Acquired by Non-Contact FMCW Radar

Hyeong-Rok Ryu, Woo-Seok Kang, Kyung-Ho Kim

This study aligns ECG, SCG, and FMCW radar signals to ECG R-peaks and analyzes morphology-based AO/AC candidate timing across 848 corresponding beats.

Concurrent acquisition: 600 s
Corresponding beats: 848

First author · Poster preparation · Presentation participation

Publication details Official Conference Paper Code

Bibliographic sources: original proceedings and conference page. Individual DBpia record: unconfirmed in the 2026-08-01 title search.

First page of the ultrasound–smart-mirror paper, with four authors and proceedings page 33

Co-author · 3/4 Conference proceedings

The 57th KIEE Summer Conference 2026 · 2026

Published 2026.07.08 · pp. 33–34

A study on ultrasound-smart mirror fusion technology for personalized body fat management

Dongmin Son, Jeonghyun Lee, Hyeongrok Ryu, Heechul Yoon

A system that derives subcutaneous-fat and muscle thickness from abdominal B-mode ultrasound boundaries and displays measurement guidance and results on a smart mirror.

Co-author · third of four authors

Publication details Official Conference Paper

Bibliographic source: supplied proceedings PDF, pp. 33–34.

Conference presentations

CICS’25 · 2025.10.23
KIEE 2026 · 2026.07.10

Related Code and Projects

PPG–HRV · FMCW Radar

The first paper combines PPG-derived HRV features with a CNN to classify cognitive-task performance. The second aligns concurrent ECG, SCG, and FMCW radar acquisition and compares AO and AC candidate timing around ECG R-peaks.