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Hyunseok Ryu

AI / NLP Researcher · GIST

I first set out to become a senior backend engineer who could ship good services, and along the way I studied a wide range of tools — from commercial software to developer tooling such as Docker and React. Yet the more I learned, the more I felt I was only growing familiar rather than growing deeper. Returning to school and studying mathematics filled that gap: I saw how central mathematical thinking and design are to understanding the world. I now want to build on mathematics, logic, and imagination — connecting abstract reasoning with concrete implementation — to become a researcher and practitioner who understands modern systems end to end.

Publications

  • SHRAG: A Framework for Combining Human-Inspired Search with RAG
    Hyunseok Ryu, Wonjune Shin, Hyun Park
    arXiv preprint (arXiv:2512.00772), 2025
    ScienceON Challenge (RDGenAI 2025, KISTI)
    [arXiv]
  • Digital Twin Agent Implementation based on CIP Concept
    Hyunseok Ryu, Inyong Song, Jong-Won Kim (류현석, 송인용, 김종원)
    Annual Conference of KIPS 31(2), 463–466, 2024
    Korea Information Processing Society (한국정보처리학회)

Projects

Automated Market-Trend Analysis

2022.06 – 2022.10
GIST AI project · Team Lead

A semi-automated market-response system for hyper-personalization: architected the pipeline and combined multiple NLP models to extract trends from online communities.

  • Architected the overall solving system
  • Combined BERT, Transformer, LSTM and soynlp for the task
  • Hands-on Korean-text data preprocessing
BERTTransformerLSTMsoynlpPython

Restricted-Area Human-Detection CCTV Alert App

2020.04 – 2020.06
ROK Army competition support · Dev Lead & Planner

On-device object detection on a Raspberry Pi 4 detects intruders in a restricted zone, pushes an alert to a phone, and records / streams to a server in real time.

  • React Native app with push notifications, GPS, and Kakao API
  • ExpressJS / Node.js RESTful and socket server
  • TensorFlow object detection running on Raspberry Pi 4
  • Deeper understanding of JavaScript and of individual ownership within a team
JavaScriptReact NativeNode.js/ExpressTensorFlowRaspberry Pi

Fatogo — Group Travel Booking Platform

2018.04 – 2018.12
Funded by GIST (₩8M) · Dev Lead & Service Planner

A tailored accommodation-booking platform for groups of young travelers.

  • Deployed a Django backend on AWS EC2
  • Designed RESTful APIs and integrated PostgreSQL with Django
  • Built and led a 4–6 person team
  • Learned first-hand how much project planning and communication matter
PythonDjangoPostgreSQLAWS EC2HTML/CSS

Self-Balancing Robot

2018.07 – 2018.08
GIST Competition · Individual project

Kept a robot upright from MPU 6-axis sensor data. Because gimbal lock does not occur in this setup, a quaternion frame was unnecessary.

  • Complementary filter over the MPU 6-axis sensor for accurate attitude estimation
  • PID control for balancing; raised the center of mass for stability
  • Motors were too slow to fully prevent falls — tuning the PID integral (I) gain remained the open challenge
mbed STM32F411CPID control

Vehicle Tracking System

2018.07 – 2018.08
GIST Competition · Team Lead / Developer

Collected and analyzed gyroscope and accelerometer data from an Android background process to infer which mode of transportation a user was riding, with an analysis pipeline on AWS.

  • Android background data-collection app (Android Studio)
  • Django REST API and data-collection server (AWS EC2, SQLite)
  • Real-time analysis with Python multiprocessing
  • First real experience of team collaboration and project planning
AndroidDjangoPythonAWS EC2Ubuntu

Client / Freelance Work

  • Dental Assistant App (frontend) — rendered panorama-analysis results as charts with a real-time 1:1 messaging service.
  • Wisdom-tooth Extraction Webview (fullstack) — patient-management app for doctors at Yonsei University Hospital.
  • XFashion Virtual Try-on AI website (closefits.com/coordi) — AI try-on prototype.
  • K-Digital Training educator — networking, cloud, and AI infrastructure.