Dongsik Kim
Pohang University of Science and Technology · 工学
研究室紹介
Professor Dongsik Kim's research lab specializes in advanced laser-material interactions and their applications in precision manufacturing, materials processing, and wireless communications. The lab focuses on femtosecond laser processing for nanojoining of conductive nanostructures, 3D printing of refractory metals like tungsten using directed energy deposition, and liquid-assisted laser ablation for clean, efficient material removal. Additionally, the lab explores signal processing and physical layer optimization in wireless communication systems, particularly in cooperative relaying and channel estimation for SC-FDMA. These interdisciplinary efforts bridge materials science, photonics, and telecommunications with a strong emphasis on experimental validation and practical implementation.
Research Overview
Research Output Trend
Figures are computed from collected data and may differ slightly.
Selected Papers
15Although three-dimensional (3D) printing of tungsten parts by Powder Bed Fusion (PBF) has been demonstrated by multiple research groups, a directed energy deposition (DED) process for fabricating pure tungsten structures has never been reported. This work reports successful fabrication of pure tungsten structures by DED, revealing the required process conditions. The effect of laser power, scan speed, powder feed rate and carrier gas velocity on the stability and properties of the structures is
Femtosecond laser irradiation enables local crystalline nanojoining of silver nanowires with minimizing thermal damage on flexible substrates.
The effect of an artificially deposited liquid film on a laser-ablated metal surface at near-threshold laser fluences is presented. Experiments utilizing a Q-switched Nd:YAG laser (wavelength=1064 nm, full width at half maximum=6 ns) reveal that deposition of a liquid film results in substantial reduction of ablation threshold and enhancement of ablation yield. In addition, enlarged photoacoustic emission is detected in the ablation involving the liquid film. The augmentation of ablation efficie