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RISS 인기검색어
- 검색키워드
- 저자 : Joonho Yoon (검색결과 72 건)
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Yoon, Hong Min,Kondaraju, Sasidhar,Lee, Jung Shin,Suh, Youngho,Lee, Joonho H.,Lee, Joon Sang Elsevier 2017 APPLIED SURFACE SCIENCE - Vol.409 No.-
<P><B>Abstract</B></P> <P>Recent studies have revealed that contact line forces play an important role in the droplet spreading process. Despite their significance, the physics related to them has been studied only indirectly and the effect of contact line forces is still being disputed. We performed a molecular dynamics simulation and mimicked the droplet spreading process at the nanoscale. Based on the results of the simulation, the contact line forces were directly calculated. We found that the forces acting on the bulk and the contact line region showed different trends. Distinct positive and negative forces, contact line spreading, and friction forces were observed near the contact line. We also observed a strong dependency of the atomic kinetics in the contact line region on the variations in the contact line forces. The atoms of the liquid in the contact line region lost their kinetic energy due to the contact line friction force and became partially immobile on the solid surface. The results of the current study will be useful for understanding the role of the contact line forces on the kinetic energy dissipation in the contact line region.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Contact line forces, including friction and spreading forces are directly calculated. </LI> <LI> Overall trends of variations in contact line forces during droplet spreading process show characteristics of contact line forces. </LI> <LI> Detail relations of contact line forces and atomic kinetics in the contact line provide a clear evidence of the possible energy dissipation mechanism in droplet spreading process. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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Yoon, H.N.,Seo, Joonho,Kim, Seonhyeok,Kil, Taegeon,Jang, Daeik,Bae, Jin-Ho,Lee, H.K. Techno-Press 2021 Advances in concrete construction Vol.12 No.1
The sound-absorption and NO<sub>x</sub>-removal performances of TiO<sub>2</sub>-incorporated porous concrete made with bottom ash aggregates were investigated. Concrete samples made with bottom ash aggregates having different paste-to-aggregate volume ratios (i.e., 0.2, 0.3 and 0.4) and TiO2 contents (i.e., 0%, 1% and 3%) were fabricated. The correlation between the voids and the mechanical strength values of concretes made with bottom ash aggregates was investigated through void ratio measurement and compressive strength tests to derive a proper aggregate size. The influence of target void and TiO<sub>2</sub> content on the void ratio, compressive strength, sound-absorption, and NO<sub>x</sub>-removal performances of the samples was explored through compressive strength, void ratio, sound-absorption, and NO<sub>x</sub>-removal performance tests. The test results indicated that the sound-absorption and NO<sub>x</sub>-removal performances of the concrete samples were greatly influenced by the total void ratio, and the NO<sub>x</sub>-removal efficiency of the concrete samples was further promoted with an increase in the TiO<sub>2</sub> content. These coupled effects were possibly attributed to the fact that the photocatalytic reaction is surface-oriented and can be affected by an increase in the total void ratio, increasing the available number of TiO<sub>2</sub> particles on the surface that can facilitate the photocatalytic reaction when exposed to light.
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Chung, Joonho,Kim, Moon Hang,Yoon, Yong Je,Kim, Kil Hwan,Park, So Ra,Choi, Byung Hyune Journal of Neurosurgery Publishing Group 2014 Journal of Neurosurgery: Spine Vol.21 No.6
<B>Object</B><P>This study investigated the effects of granulocyte colony-stimulating factor (G-CSF) on glial scar formation after spinal cord injury (SCI) in rats and compared the therapeutic effects between G-CSF and granulocytemacrophage colony-stimulating factor (GM-CSF) to evaluate G-CSF as a potential substitute for GM-CSF in clinical application.</P><B>Methods</B><P>Rats were randomly assigned to 1 of 4 groups: a sham-operated group (Group 1), an SCI group without treatment (Group 2), an SCI group treated with G-CSF (Group 3), and an SCI group treated with GM-CSF (Group 4). G-CSF and GM-CSF were administered via intraperitoneal injection immediately after SCI. The effects of G-CSF and GM-CSF on functional recovery, glial scar formation, and axonal regeneration were evaluated and compared.</P><B>Results</B><P>The rats in Groups 3 and 4 showed better functional recovery and more decreased cavity sizes than those in Group 2 (p < 0.05). Both G-CSF and GM-CSF suppressed intensive expression of glial fibrillary acidic protein around the cavity at 4 weeks and reduced the expression of chondroitin sulfate proteoglycans (p < 0.05). Also, early administration of G-CSF and GM-CSF protected axon fibers from destructive injury and facilitated axonal regeneration. There were no significant differences in comparisons of functional recovery, glial scar formation, and axonal regeneration between G-CSF and GM-CSF.</P><B>Conclusions</B><P>G-CSF suppressed glial scar formation after SCI in rats, possibly by restricting the expression of glial fibrillary acidic protein and chondroitin sulfate proteoglycans, which might facilitate functional recovery from SCI. GM-CSF and G-CSF had similar effects on glial scar formation and functional recovery after SCI, suggesting that G-CSF can potentially be substituted for GM-CSF in the treatment of SCI.</P>
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