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Byunghoon Chung,Hun Lee,Bong Joon Choi,Kyung Ryul Seo,Eung Kwon Kim,Dae Yune Kim,Tae-im Kim 대한안과학회 2017 Korean Journal of Ophthalmology Vol.31 No.1
Purpose: The purpose of this study was to investigate the clinical efficacy of an optimized prolate ablation procedure for correcting residual refractive errors following laser surgery. Methods: We analyzed 24 eyes of 15 patients who underwent an optimized prolate ablation procedure for the correction of residual refractive errors following laser in situ keratomileusis, laser-assisted subepithelial keratectomy, or photorefractive keratectomy surgeries. Preoperative ophthalmic examinations were performed, and uncorrected distance visual acuity, corrected distance visual acuity, manifest refraction values (sphere, cylinder, and spherical equivalent), point spread function, modulation transfer function, corneal asphericity (Q value), ocular aberrations, and corneal haze measurements were obtained postoperatively at 1, 3, and 6 months. Results: Uncorrected distance visual acuity improved and refractive errors decreased significantly at 1, 3, and 6 months postoperatively. Total coma aberration increased at 3 and 6 months postoperatively, while changes in all other aberrations were not statistically significant. Similarly, no significant changes in point spread function were detected, but modulation transfer function increased significantly at the postoperative time points measured. Conclusions: The optimized prolate ablation procedure was effective in terms of improving visual acuity and objective visual performance for the correction of persistent refractive errors following laser surgery.
Choi, Jihye,Kang, Byunghoon,Kim, Hyun-Ouk,Suh, Jin-Suck,Haam, Seungjoo,Yang, Jaemoon The Royal Society of Chemistry 2019 Nanoscale Vol.11 No.5
<P>Herein, we report a <I>de novo</I> synthesis approach to produce bandgap-controlled polyaniline (PAni) nanostructure <I>via</I> Mn-mediated oxidative polymerization at the catalytic nanoreactor. To achieve systemic nanoconfined polymerization, manganese oxide (MnOx) nanoparticles coated with silica were used as the sacrificial nanotemplate. Interestingly, the catalytic nanoreactor simultaneously allowed the nanoconfined oxidative polymerization and controlling of the bandgap. MnOx could be reduced by the addition of aniline monomers and consecutive redox reaction at the nanoreactor. Furthermore, core cavity was generated, and ionized Mn could control the bandgap by coordination at the nanostructures.</P>
A study on the formation mechanism of ytterbium silicide for Schottky contact applications
Na, Sekwon,Choi, Hwayoul,Lee, Byunghoon,Choi, Juyun,Seo, Yujin,Kim, Hyoungsub,Lee, Seok‐,Hee,Lee, Hoo‐,Jeong John Wiley Sons, Ltd 2012 Surface and interface analysis Vol.44 No.11
<P>This article reports some new details of the Yb silicide formation mechanism. The combination of high‐resolution transmission electron microscopy and energy dispersive spectroscopy helped us to unravel several interesting aspects of the silicidation process at the early stage. Interdiffusion between Si and Yb was extensive even at low temperatures (<250 °C) and led to the formation of an amorphous layer, followed by the nucleation of crystalline YbSi<SUB>2−<I>x</I></SUB> at the bottom of the amorphous layer. Upon annealing at 350 °C, the silicide layer grew thicker as a flat layer of a uniform thickness with two epitaxial relations with the underlying Si lattice. Annealing at higher temperatures (400 °C and 500 °C) prompted silicide grains with random orientations to nucleate and grow on the epitaxial layer, producing a bilayer morphology. Copyright © 2012 John Wiley & Sons, Ltd.</P>
Park, Bernie Byunghoon,Lee, NaHye,Kim, YunHye,Jae, YoonGyu,Choi, Seunghyun,Kang, NaNa,Hong, Yu Ri,Ok, Kiwon,Cho, Jeonghee,Jeon, Young Ho,Lee, Eun Hee,Byun, Youngjoo,Koo, JaeHyung Wiley (John WileySons) 2017 ChemMedChem Vol.12 No.7
<P>Identification of potent agonists of odorant receptors (ORs), a major class of Gprotein-coupled receptors, remains challenging due to complex receptor-ligand interactions. ORs are present in both olfactory and non-chemosensory tissues, indicating roles beyond odor detection that may include modulating physiological functions in non-olfactory tissues. Selective and potent agonists specific for particular ORs can be used to investigate physiological functions of ORs in non-chemosensory tissues. In this study, we designed and synthesized novel synthetic dehydroacetic acid analogues as agonists of odorant receptor 895 (Olfr895) expressed in bladder. Among the synthesized analogues, (E)-3-((E)-1-hydroxy-3-(piperidin-1-yl)allylidene)-6-methyl-2H-pyran-2,4(3H)-dione (10) exhibited extremely high agonistic activity for Olfr895 in Dual-Glo luciferase reporter (EC50=9nm), Ca2+ imaging, and chemotactic migration assays. Molecular docking and site-directed mutagenesis studies suggested that a combination of hydrophilic and hydrophobic interactions is central to the selective and specific binding of 10 to Olfr895. The design of agonists armed with both hydrophilic and hydrophobic portions could therefore lead to highly potent and selective ligands for ectopic ORs.</P>