Seunghyun An

Hi, I'm Seunghyun. I am a PhD candidate at the University of Wisconsin-Madison, where I focus on operating systems and host networking. Currently I am advised by Professor Ming Liu. At KAIST, I worked with Professor Youngjin Kwon on Rust OS and SmartSSDs. At EPFL, I worked with Professor Sanidhya Kashyap on Rust filesystems.

I am seeking Summer 2027 internships in systems software, operating systems, and performance engineering.

Outside research, I am an amateur astronomer interested in visual observing. I also enjoy cooking and spending time outdoors.

seunghyun at cs.wisc.edu

Publications

cSwitch: Scheduling Linux Threads under the I/O Chiplet Wall

SOSP 2026

Seunghyun An, Joontaek Oh, Ming Liu

Designed cSwitch, a Linux scheduling framework that uses a software-switch abstraction to model traffic through the I/O chiplet
Mitigated I/O-chiplet contention through traffic-aware thread scheduling

Server Chiplet Networking [PDF]

HotNets 2025

Seunghyun An, Joontaek Oh, Ming Liu

Characterized the chiplet network of two generations of AMD EPYC CPUs
Proposed future directions with chiplet networking

Education

University of Wisconsin - Madison

Madison, WI, USA

Ph.D. in Computer Science Aug. 2024 – Present

GPA: 4.0/4.0
Doctoral Minor in Astronomy

Korea Advanced Institute of Science and Technology (KAIST)

Daejeon, South Korea

B.S. Double Major in Computer Science and Electrical Engineering Mar. 2018 – Aug. 2024

GPA: 3.88/4.3, Magna Cum Laude
Honor Student

École Polytechnique Fédérale de Lausanne (EPFL)

Lausanne, Switzerland

Exchange Student in Computer Science Spring 2023

Teaching Experience

Teaching Assistance at UW-Madison

CS354 Machine Organization and Programming (Spring 2026)
CS537 Introduction to Operating System (Fall 2024, Spring/Fall 2025)

Teaching Experience at KAIST

Humanity/Leadership III: Hacking Class (Fall 2023)
Python Tutoring at Daeduk High School (2022)
Freshman Tutoring: Introduction to Programming (Spring 2022)
Freshman Tutoring: General Physics II (Fall 2021)

Honors

Dean’s List in School of Engineering, Spring 2021
Presidential Science Scholarship, 2018 – 2024
Reached the Best Result in 22nd International Astronomy Olympiad (IAO), 2017

Technical Skills

Programming Languages: C/C++, Rust, Python

Languages: Korean (Native), English (Proficient)

Algorithmic problem solving: LeetCode Guardian (2100+ contest rating)

Professional Experience

Military Service

Pyeongtaek, South Korea

Served as KATUSA in Eighth Army Public Affairs 2019 – 2020

Awarded Army Commendation Medal(ARCOM) from the U.S. Army

Miscellaneous Projects

KSSA–UW Website

KSSA–UW

IT Officer Jul. 2025 – Present

Maintain the website serving UW–Madison’s Korean graduate student community
Led its responsive redesign and migrated the Rhymix deployment to AWS EC2 and Cloudflare

HealthyPi 5 Firmware for Zephyr RTOS

UW–Madison

Advised by Prof. Ming Liu May 2026

Implemented stable, rate-controlled BLE communication for HealthyPi 5
Added multiple sensor-data streaming over BLE