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Going Beyond the Olle Trails: A Digital Approach to Promote Oreum Hiking on Jeju Island
Donghwa Yoon,Walimuni Arachchilage Chathuri,Bye Paul Curtis,Priyana Panta,Ahmmed Md Jitu,Mincheol Kim,Jinhyun Ahn 한국경영과학회 2023 한국경영과학회 학술대회논문집 Vol.2023 No.5
Implication • Oreum Tourism Platform as an innovative solution • Facilitate trip planning and exploration • Foster community and environmental stewardship • Contribute to the sustainable development of Jejus tourism industry
Going Beyond the Olle Trails: A Digital Approach to Promote Oreum Hiking on Jeju Island
Donghwa Yoon,Walimuni Arachchilage Chathuri,Bye Paul Curtis,Priyana Panta,Ahmmed Md Jitu,Mincheol Kim,Jinhyun Ahn 대한산업공학회 2023 대한산업공학회 춘계학술대회논문집 Vol.2023 No.5
Implication • Oreum Tourism Platform as an innovative solution • Facilitate trip planning and exploration • Foster community and environmental stewardship • Contribute to the sustainable development of Jejus tourism industry
CASE REPORT : A Granulomatous Drug Eruption Induced by Entecavir
( Jimi Yoon ),( Donghwa Park ),( Chiyeon Kim ) 대한피부과학회 2013 Annals of Dermatology Vol.25 No.4
Entecavir (Baraclude®, Bristol-Myers Squibb) is a potent and selective antiviral agent that has demonstrated efficacy in patients with chronic hepatitis B. The most frequent adverse events attributed to entecavir include increased alanine aminotransferase, upper respiratory tract infection, headache, abdominal pain, cough, pyrexia, fatigue, and diarrhea. Although quite a few randomized double-blind studies including ones investigating adverse events along with these general symptoms have been reported, few cases of cutaneous adverse events have been described in detail. We demonstrate a case of granulomatous drug eruption as a cutaneous adverse event induced by entecavir. (Ann Dermatol 25(4) 493∼495, 2013)
Fabrication method for ultra-long optical micro/nano-fibers
Lee, Donghwa,Lee, Kwang Jo,Kim, Jin-Hun,Park, Kyungdeuk,Lee, Dongjin,Kim, Yoon-Ho,Shin, Heedeuk Elsevier 2019 CURRENT APPLIED PHYSICS Vol.19 No.12
<P><B>Abstract</B></P> <P>Nonlinear optical interactions can be enhanced dramatically by tight light-confinement and long interaction-length. Optical fiber tapers with micro/nano-thickness waists considerably increase light-matter interactions in or near their waists. Here, we propose and demonstrate a novel tapering method of fabricating uniform, low-loss, and ultra-long micro/nano fibers. The technique comprises three steps for conventional flame-brushing and pulling, recalibration, and one-directional pulling. Using the proposed method, two strands of tapered fibers are fabricated, having 0.82-μm/1.6-μm diameters, 220-mm/500-mm uniform lengths with <55-nm/66-nm diameter variances, and high transmittances of 90.2%/91.5%. A figure of merit indicating the nonlinear-optic efficiency is defined and used to compare the results obtained in this study with those for tapered fibers in references. The proposed tapering method will be very useful for the fabrication of tapered fiber devices exploiting nonlinear optic effects, including Brillouin scattering, Raman amplification, and other third-order nonlinearities for supercontinuum generation.</P>
A zero-thermal-quenching phosphor
Kim, Yoon Hwa,Arunkumar, Paulraj,Kim, Bo Young,Unithrattil, Sanjith,Kim, Eden,Moon, Su-Hyun,Hyun, Jae Young,Kim, Ki Hyun,Lee, Donghwa,Lee, Jong-Sook,Im, Won Bin Nature Publishing Group, a division of Macmillan P 2017 NATURE MATERIALS Vol.16 No.5
<P>Phosphor-converted white light-emitting diodes (pc-WLEDs) are efficient light sources used in lighting, high-tech displays, and electronic devices. One of the most significant challenges of pc-WLEDs is the thermal quenching, in which the phosphor suffers from emission loss with increasing temperature during high-power LED operation. Here, we report a blue-emitting Na3-2xSc2(PO4)(3):xEu(2+) phosphor (lambda(em) = 453 nm) that does not exhibit thermal quenching even up to 200 degrees C. This phenomenon of zero thermal quenching originates from the ability of the phosphor to compensate the emission losses and therefore sustain the luminescence with increasing temperature. The findings are explained by polymorphic modification and possible energy transfer from electron-hole pairs at the thermally activated defect levels to the Eu2+ 5d-band with increasing temperature. Our results could initiate the exploration of phosphors with zero thermal quenching for high-power LED applications.</P>