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RISS 인기검색어
- 검색키워드
- 저자 : Joonho Yoon (검색결과 73 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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Structural Properties of Fibril-forming Segments of α-Synuclein
Jeseong Yoon,Joonho Park,장순민,이경희,신석민 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.3
We have performed replica-exchange molecular dynamics simulations on 41 residue peptide mainly composed of NAC (non Aβ component) sequence in α-Synuclein. To investigate conformational characteristics of intrinsically unstructured peptides, we carried out structural analysis on the ‘representative structures’ for ensemble of structures occurring at different temperatures. The secondary structure profile obtained from our simulations suggests that the NAC region of α-synuclein can be divided into roughly three helical-like segments. It is found that the overall helix-turn-helix like topology is conserved even though the conformational fluctuations grow as the temperature increases. The coordinate-based and the distance-based representative structures exhibit noticeable differences at higher temperatures while they are similar at lower temperatures. It is found that structural variations for the coordinate-based representative structures are much larger, suggesting that distance-based representative structures provide more reliable information concerning characteristic features of intrinsically unstructured proteins. The present analysis also indicates that the conformational features of representative structures at high temperatures might be related to those in membrane or low pH environment.
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