Sanghyun Ahn is currently a Ph.D. student in the Department of Mechanical Engineering at Yonsei University, focusing on microneedles for drug delivery. His research involves using screen printing techniques to create substrate-free hyaluronic acid (HA) MN patches, aiming to improve the flexibility, scalability, and efficiency of MN production, particularly for curved or irregular surfaces. He was awarded the Best Paper Award by the Korean Society of Mechanical Engineers in 2003.