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jun-hyuk.com
[email protected]
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A portrait of Jun Hyuk Chang

He is a fourth-year Ph.D. student in Computer Science at the University of Chicago, advised by Aaron J. Elmore and collaborating closely with Goetz Graefe. His research focuses on database systems, with interests in query optimization and indexing. Before his Ph.D., he earned his M.S. and B.S. from KAIST and spent about five years in industry at SK hynix and a database systems company.

Education

University of Chicago

Chicago, IL, USA
Ph.D. in Computer Science 2022 – 2027

KAIST

Daejeon, South Korea
M.S. in Computer Science 2016 – 2018
B.S. in Electrical Engineering 2013 – 2016

Experience

TikTok (Bytedance)

San Jose, CA, USA
Research Scientist Intern Jun. 2025 – Sep. 2025
  • Optimized OLAP database query execution engine (Velox) performance on Apache Spark.
  • Implemented a zero-copy serializer/deserializer using Apache Arrow to accelerate data spilling.

SK hynix

Bundang, Gyeonggi, South Korea
Tech Leader Aug. 2021 – Sep. 2022
  • Designed and developed a platform firmware (FIL, FTL layer) for NAND media.
  • On leave for Ph.D. studies since Sep. 2022.

TmaxData

Bundang, Gyeonggi, South Korea
Team Leader & Researcher Feb. 2018 – Aug. 2021
  • Led a team of 10 engineers for the database's active storage.
  • Designed and developed the primary database storage manager and architected re-balance and re-sync.

Kiswe Mobile Inc.

New Providence, NJ, USA
Software Engineer Intern Jun. 2016 – Aug. 2016
  • Developed a real-time interactive advertising system.
  • Engineered a real-time voting system with live results.

SK hynix

Icheon, Gyeonggi, South Korea
NAND Design Engineer Intern Dec. 2015 – Feb. 2016
  • Designed and verified NAND read/write functionality through simulation and testing with Verilog and HSPICE.

Publications

Enhancing Transaction Processing through Indirection Skipping PDF icon Paper site icon

Riki Otaki, Jun Hyuk Chang, Aaron J. Elmore, Goetz Graefe

VLDB 2025: Proceedings of the Very Large Data Base Endowment Inc, Volume 18, Issue 11, Pages 4104–4116

Resource-Adaptive Query Execution with Paged Memory Management PDF icon Paper site icon

Riki Otaki, Jun Hyuk Chang, Charles Benello, Goetz Graefe, Aaron J. Elmore

CIDR 2025: Conference on Innovative Data Systems Research

Towards Resource-adaptive Query Execution in Cloud Native Databases PDF icon Paper site icon

Rui Liu, Jun Hyuk Chang, Riki Otaki, Zhe Heng Eng, Aaron J. Elmore, Michael J. Franklin, Sanjay Krishnan

CIDR 2024: Conference on Innovative Data Systems Research

Amygdala resting-state functional connectivity alterations in patients with chronic insomnia disorder: correlation with electroencephalography beta power during sleep PDF icon Paper site icon

Woojin Kweon, Kyung Hwa Lee, Sang Ho Choi, Jiyoon Shin, Mincheol Seo, Jeong Eun Jeon, Ha Young Lee, Chowon Park, Sun-Young Kim, Jong Won Kim, Jun Hyuk Chang, Yu Jin Lee

Sleep 2023: Sleep, Volume 46, Issue 10, October 2023, zsad205

Enjoy the Silence: Noise Control with Smartphones PDF icon Paper site icon

Taesik Gong, Jun Hyuk Chang, Joon-Gyum Kim, Soowon Kang, Donghwi Kim, Sung-Ju Lee

ICCCN 2017: IEEE International Conference on Computer Communications and Networks

AIFI: Asynchronous Interaction Feedback Interface for Remote Presentation Preparation Paper site icon

Jun Hyuk Chang, Hyunsung Cho, Suhwan Jee, Chunjong Park, Minsuk Chang, Juho Kim, Sung-Ju Lee

KSC 2017: Korean Institute of Information Scientists and Engineers (KIISE), Korea Software Congress