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Design process of patient-specific osteosynthesis plates using topology optimization
Park Si-Myung,Park Soyeon,Park Jieun,Choi Minwook,Kim Laehyun,Noh Gunwoo 한국CDE학회 2021 Journal of computational design and engineering Vol.8 No.5
To reduce complications related to the osteosynthesis plating system, the use of a patient-specific plate design was proposed. However, the issue of associated complications is still critical. Because existing patient-specific plate designs have mainly relied on parametric studies, a design method is needed that considers the complex factors influencing the performance of the reconstruction and that can be generalized for various patients. The goal of this study was to propose a design process that can strengthen the advantages of a customized plate to reduce patient discomfort and ensure the stability of surgery. We applied topology optimization to design a plate for a case of mandibular condyle fracture. The optimization problem was set to maximize the plate stiffness and minimize its volume. The performance of the designed plate was evaluated using finite element simulations, which approximated the various mastication states. Plate performance was then compared with the performance of two conventional plating systems: bent plates and computerized numerical control-machined plates. The conventional plate models used a pair of mini-plates, and the bent plate was modeled by conducting bending simulation. Each finite element model was appraised via masticatory simulations under static molar-jaw-closing conditions. Differences in stress concentration were noted between the model with bent plates and the model with computerized numerical control-machined plates. The most severe stress concentration occurred in the bent plate, which was affected by the residual stress from the bending process. In comparison with the two conventional plates, the newly designed plate exhibited significantly improved biomechanical stability in terms of stress and stiffness and had approximately twice the endurance capability against fractured bone separation. The newly designed plate was designed to have a balance between volume and plate stiffness, and it showed superior stability over the conventional plates. The proposed plate design process using topology optimization is an effective method not only because it enhances the advantages of the patient-specific plate but also because it can be applied in various reconstruction cases.
Park, Sohyeon,Park, Joohee,Heo, Jiwoong,Lee, Sang-Eun,Shin, Jong-Wook,Chang, Minwook,Hong, Jinkee THE KOREAN SOCIETY OF INDUSTRIAL AND ENGINEERING 2018 Journal of Industrial and Engineering Chemistry Vol.68 No.-
<P><B>Abstract</B></P> <P>Medical silicone tubes are generally used as implants for the treatment of nasolacrimal duct stenosis. However, side effects such as allergic reactions and bacterial infections have been reported following the silicone tube insertion, which cause surgical failure. These drawbacks can be overcome by modifying the silicone tube surface using a functional coating. Here, we report a biocompatible and superhydrophilic surface coating based on a polysaccharide multilayer nanofilm, which can load and release antibacterial and anti-inflammatory agents. The nanofilm is composed of carboxymethylcellulose (CMC) and chitosan (CHI), and fabricated by layer-by-layer (LbL) assembly. The LbL-assembled CMC/CHI multilayer films exhibited superhydrophilic properties, owing to the rough and porous structure obtained by a crosslinking process. The surface coated with the superhydrophilic CMC/CHI multilayer film initially exhibited antibacterial activity by preventing the adhesion of bacteria, followed by further enhanced antibacterial effects upon releasing the loaded antibacterial agent. In addition, inflammatory cytokine assays demonstrated the ability of the coating to deliver anti-inflammatory agents. The versatile nanocoating endows the surface with anti-adhesion and drug-delivery capabilities, with potential applications in the biomedical field. Therefore, we attempted to coat the nanofilm on the surface of an ophthalmic silicone tube to produce a multifunctional tube suitable for patient-specific treatment.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Multilayer thin films for the construction of active repulsive hydrogen barriers
Park, Minwook,Kim, Dae-Yoon,Kang, Dong-Gue,Yoon, Won-Jin,Choi, Yu-Jin,Lee, Joong Hee,Jeong, Kwang-Un The Royal Society of Chemistry 2018 Journal of Materials Chemistry A Vol.6 No.6
<P>An active repulsive hydrogen (H2) barrier thin film (ARHB-tfilm) was fabricated by layer-by-layer (LbL), spin and plasma sequential coatings on a poly(ethylene terephthalate) (PET) film. Protons generated by the reduction of H2 on the palladium nanolayer can be trapped in the proton-rich Nafion region by the electrical repulsive force formed at the interface of the positively charged polymer nanolayer. The multilayer ARHB-tfilms showed a significant improvement in hydrogen gas barrier properties.</P>
Hierarchical Hybrid Nanostructures Constructed by Fullerene and Molecular Tweezer
Park, Minwook,Hong, Kyeong-Im,Kang, Minji,Kim, Tae-Wook,Lee, Hosoowi,Jang, Woo-Dong,Jeong, Kwang-Un American Chemical Society 2019 ACS NANO Vol.13 No.5
<P>For the construction of well-defined hierarchical superstructures of pristine [60]fullerene (C<SUB>60</SUB>) arrays, pyrene-based molecular tweezers (PT) were used as host molecules for catching and arranging C<SUB>60</SUB> guest molecules. The formation of host-guest complexes was systematically studied in solution as well as in the solid state. Two-dimensional proton nuclear magnetic resonance spectroscopic studies revealed that PT-host and C<SUB>60</SUB>-guest complexes were closely related to the molecular self-assembly of PT. Ultraviolet and fluorescence spectroscopic titrations indicated the formation of stable 1:1 and 2:1 (PT/C<SUB>60</SUB>) complexes. From the nonlinear curve-fitting analysis, equilibrium constants for the 1:1 (log <I>K</I><SUB>1</SUB>) and 2:1 (log <I>K</I><SUB>2</SUB>) complexes were estimated to be 4.96 and 5.01, respectively. X-ray diffraction results combined with transmission electron microscopy observations clearly exhibited the construction of well-defined layered superstructures of the PT-host and C<SUB>60</SUB>-guest complexes. From electron mobility measurements, it was demonstrated that the well-defined hierarchical hybrid nanostructure incorporating a C<SUB>60</SUB> array exhibited a high electron mobility of 1.7 × 10<SUP>-2</SUP> cm<SUP>2</SUP> V<SUP>-1</SUP> s<SUP>-1</SUP>. This study can provide a guideline for the hierarchical hybrid nanostructures of host-guest complex and its applications.</P> [FIG OMISSION]</BR>
Effect of ozone concentration on atomic layer deposited tin oxide
Park, Hyunwoo,Park, Joohyun,Shin, Seokyoon,Ham, Giyul,Choi, Hyeongsu,Lee, Seungjin,Lee, Namgue,Kwon, Sejin,Bang, Minwook,Lee, Juhyun,Kim, Bumsik,Jeon, Hyeongtag American Institute of Physics 2018 Journal of Vacuum Science & Technology. A Vol.36 No.5
금속이온 잉크와 탄소나노튜브 용액의 에어브러싱 적층 기반 고성능 고내구성 박막형 히팅 모듈의 수월 제작 기술
김민욱(Minwook Kim),김민규(Mingyu Kim),김광준(Kwangjun Kim),박재원(Jaewon Park),이민영(Minyoung Lee),최현식(Hyunsik Choi),박종갑(Jonggab Park),노현찬(Hyeonchan Noh),윤부현(Boohyeon Youn),정은창(Eunchang Jeong),최광진(Kwangjin Choi),허 대한전기학회 2020 대한전기학회 학술대회 논문집 Vol.2020 No.7