Pohang University of Science and Technology · Engineering
Professor Dongsik Kim's research lab specializes in advanced laser-material interactions and additive manufacturing, with a focus on high-melting-point materials such as tungsten and silver nanowires. The lab investigates laser-based fabrication and processing techniques—including directed energy deposition (DED), femtosecond laser nanojoining, and liquid-assisted laser ablation—to enable precise, low-damage manufacturing on flexible and robust substrates. Key research directions include optimizing laser process parameters, understanding plasma and bubble dynamics in laser-matter interactions, and developing innovative methods for spectral efficiency and error resilience in wireless communications. The lab also explores applications in clean energy, advanced electronics, and next-generation wireless systems through interdisciplinary approaches combining materials science, photonics, and signal processing.
Figures are computed from collected data and may differ slightly.
Although 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
The relay employs network coding to transmit the packets from the source nodes simultaneously, for increasing spectral efficiency in wireless environments. The cooperative transmission based on network coding usually works on decode-and-forward (DF) protocols. However, detection errors at the relay cause error propagation, which degrades the performance of cooperative communications. To overcome this problem, we model the error propagation effect of the DF-based system at the destination as the
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