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"Moon Kyu Kwak"

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"Moon Kyu Kwak"

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Mass-producible Stepwise Thermal Patterning for Bio-inspired Dry Adhesives
Han Jun Park, Minsu Kim, Songyoung Lee, Moon Kyu Kwak
J. Korean Soc. Precis. Eng. 2025;42(10):833-841.
Published online October 1, 2025
DOI: https://doi.org/10.7736/JKSPE.D.25.00008

Dry adhesives inspired by gecko footpads have garnered considerable attention due to their unique features, including strong yet reversible adhesion, self-cleaning properties, and repeatable use. However, scaling these microstructured adhesives from laboratory fabrication to continuous, high-throughput manufacturing poses significant challenges. In this study, we introduce a stepwise thermal patterning system designed for the scalable production of gecko-inspired dry adhesives on flexible substrates. This automated system combines sequential processes such as plate-to-plate micro-molding, rapid thermal curing, demolding, and roll-up of the patterned film. By raising the curing temperature to approximately 180oC and employing an efficient stepwise imprinting method, we achieve fabrication speeds of up to 150 mm/min without compromising pattern accuracy. The system successfully replicates micropillar structures with a diameter of 15 μm and height of 15 μm, featuring 20 μm mushroom-shaped tips on flexible substrates. The resulting dry adhesives demonstrate stable pull-off strengths of 20-23 N/cm² and retain over 83.5% of their initial adhesion after 100,000 attachment–detachment cycles. These findings highlight the potential of our platform for reliable, high-throughput manufacturing of bio-inspired adhesives, paving the way for various industrial applications such as robotic manipulators, pick-and-place electronic assembly, and wearable devices that require repeated, residue-free attachment.

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Evaluation of the Manufacturing and Viral Killing Efficacy of Chitosan Microbeads Loaded with Disinfectants
Bong Su Kang, Sung Hak Choi, Moon Kyu Kwak, Ho-Sup Jung
J. Korean Soc. Precis. Eng. 2024;41(7):507-513.
Published online July 1, 2024
DOI: https://doi.org/10.7736/JKSPE.024.045
This study examines the efficiency of chitosan microbeads in manufacturing and their effectiveness as a disinfectant. The microbeads are developed using a solvent-assisted extraction process. The manufacturing process involves crosslinking chitosan through an emulsion-based method, with the help of a crosslinker. This leads to an increase in particle size while maintaining homogeneity and dispersion. The solvent-assisted method, which utilizes acetone, effectively extracts the crosslinked beads into the aqueous phase. This extraction process ensures the structural stability of the beads, with an average particle size of 40±3.94 ㎛. By incorporating the disinfectant agent into the chitosan beads, antiviral effects against the Porcine Reproductive and Respiratory Syndrome Virus (PRRSV) were observed. These effects were found to be effective at dilutions estimated to be between 1 : 1 and 1 : 100. The findings of this study demonstrate the inherent antiviral capabilities of chitosan beads and the enhanced impact when combined with the disinfectant. This suggests a synergistic approach to managing viral infections in livestock environments.
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Engineered Functional Materials
Moon Kyu Kwak
J. Korean Soc. Precis. Eng. 2024;41(7):499-499.
Published online July 1, 2024
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Advanced Film-Type Acoustic Reflector Inspired by Helmholtz Resonator
Sung Ho Lee, Jin Ho Choi, Gyu Man Kim, Yong Rae Roh, Moon Kyu Kwak
J. Korean Soc. Precis. Eng. 2020;37(4):283-290.
Published online April 1, 2020
DOI: https://doi.org/10.7736/JKSPE.019.150
Sound waves propagate in a manner in which energy is transmitted by adjacent molecules in the medium. These adjacent molecules exhibit inherent sound wave characteristics, such as height and wavelength, depending on the sound frequency. The Helmholtz resonator, one of the well-known acoustic elements, comprises a neck and a cavity, and features a resonance at a specific frequency related to structural dimensions. The acoustic characteristics of the Helmholtz resonator can be explained by a lumped spring-mass system in mechanical engineering; the resonant frequency can be calculated with the same analysis. The Helmholtz resonator is widely used as an acoustic filter as it can re-radiate sound waves with the opposite phase and significantly attenuate the original sound wave in the resonance frequency range. In this study, we fabricated a Helmholtz resonator-inspired film-type acoustic absorber (FAA), comprising a microscale resonator array made with polydimethylsiloxane (PDMS). Through acoustic attenuation experiments, the FAA revealed that the novel attenuation values reached up to 36.3 dB mm-1. Additionally, a continuous fabrication of the FAA was achieved via a custom-built roll-type equipment.

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  • Fabrication and Performance Evaluation of the Helmholtz Resonator Inspired Acoustic Absorber Using Various Materials
    Sung Ho Lee, Bong Su Kang, Gyu Man Kim, Yong Rae Roh, Moon Kyu Kwak
    Micromachines.2020; 11(11): 983.     CrossRef
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A Review - Productivity Enhancements of Micro/Nano Patterning Methods -
Moon Kyu Kwak
J. Korean Soc. Precis. Eng. 2018;35(11):1019-1026.
Published online November 1, 2018
DOI: https://doi.org/10.7736/KSPE.2018.35.11.1019
The purpose of this review paper is to highlight recent efforts and achievements to realize high productivity of micro/nano structure fabrication processes and feasible applications. Due to development in micro/nano fabrication processes, demands on micro/nano related applications are increasing rapidly in various fields. To meet requirements, fabrication process must have high production yield and be automated. Also, fabricated micro/nano structures are expressed on large area substrate. So, it is timely and appropriate to move forward to a new epoch by researching more robust and high throughput fabrication methods, large area fabrication techniques, and new applications. In this review paper, we present a series of recent achievements to overcome some of the limitations in productivity and product size of current fabrication processes, such as photolithography and imprinting lithography. For potential applications, transparent metal electrode, large size optical film, bus wire for narrow bezel, and water collecting surface, are briefly described to expand the application field from the well-known.

Citations

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  • Design of Transparent Conductive Oxides with Metal Patterning Techniques
    Hyeji Kim, Junghyun Lee, Younggwang Lee, Minwoo Hong, Dohyun Kim, Inpyo Lee, Chanhyuk Choi, Joondong Kim
    Journal of the Korean Solar Energy Society.2024; 44(5): 33.     CrossRef
  • Fabrication of Nanopatterned Metal Mold based on Zirconia Nanoparticle and its Application into Thermal Replication of Thermoplastic Materials
    Selim Park, Kyoung Chan Min, Sowon Jang, Yujin Ha, Wook-Bae Kim
    Journal of the Korean Society for Precision Engineering.2022; 39(7): 501.     CrossRef
  • Variation of a Triangular Pattern Shape due to Shrinkage in the Repeated UV Imprint Process
    Jiyun Jeong, Su Hyun Choi, Young Tae Cho
    Journal of the Korean Society of Manufacturing Process Engineers.2020; 19(7): 67.     CrossRef
  • Finding Ways to Deform Fine Patterns Fabricated by UV Curable Resin
    Woo Young Kim, Su Hyun Choi, Seonjun Kim, Young Tae Cho
    Journal of the Korean Society for Precision Engineering.2020; 37(4): 291.     CrossRef
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Design and Fabrication of Doctor Blade Type Dispensers for Uniform Resin Coating during Roll to Roll Imprinting Proce
Hee Chul Son, Seong Woo Kim, Jihoon Lee, Cheol Woo Park, Moon Kyu Kwak
J. Korean Soc. Precis. Eng. 2015;32(10):897-902.
Published online October 1, 2015
This study reports on a uniform resin coating method by using a doctor blade type dispenser. For high productivity, continuous imprint-lithography has been studied, and developed fabrication systems are used in several applications such as anti-reflection films, dry adhesives, and water collecting surfaces. In the continuous fabrication field, researchers have typically focused on patterning and demolding procedures. During the roll-to-roll fabrication process, however, the uniform resin coating process is also important in order to obtain a high quality product, which can be evaluated by uniform thickness, precise geometric expressions, and a thin residual layer. To achieve these, a doctor blade type dispenser was designed and fabricated. As a result, thickness of coated resin was well controlled by modulating the flow rate of the resin and blading gap. In addition, a very thin layer coating process (~ 10 μm) was achieved by softly contacting the blade on the substrate.
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Active Vibration Control of Smart Structure Using Piezoceramics
Moon Kyu Kwak
J. Korean Soc. Precis. Eng. 2001;18(12):30-46.
Published online December 1, 2001
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