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이택관,한정일 대한안과학회 2014 Korean Journal of Ophthalmology Vol.28 No.1
Dengue fever is a viral disease that is transmitted by mosquitoes and affects humans. In rare cases,dengue fever can cause visual impairment, which usually occurs within 1 month after contracting denguefever and ranges from mild blurring of vision to severe blindness. Visual impairment due to dengue fevercan be detected through angiography, retinography, optical coherence tomography (OCT) imaging,electroretinography, event electroencephalography (visually evoked potentials), and visual field analysis. The purpose of this study is to report changes in the eye captured using fluorescein angiography,indocyanine green, and OCT in 3 cases of dengue fever visual impairment associated with consistent visualsymptoms and similar retinochoroidopathic changes. The OCT results of the three patients with denguefever showed thinning of the outer retinal layer and disruption of the inner segment/outer segment (IS/OS)junction. While thinning of the retina outer layer is an irreversible process, disruption of IS/OS junction isreported to be reversible. Follow-up examination of individuals with dengue fever and associated visualimpairment should involve the use of OCT to evaluate visual acuity and visual field changes in patients withacute choroidal ischemia.
수평각막직경을 포함한 전안부 계측에 있어서 슬릿광주사 각막형태검사기와 저간섭성 반사계의 비교
이택관,박지현,강효정,권영아,송상률,김병엽,정재림.Taek Kwan Rhee. MD. Ji Hyun Park. MD. Hyo Jeong Kang. MD. Young A Kwon. MD.Sang Wroul Song. MD. Byoung Yeop Kim. MD. Jae Lim Chung. MD 대한안과학회 2014 대한안과학회지 Vol.55 No.5
Purpose: To compare the results of anterior segment biometry including white-to-white (WTW) between scanning-slit topography (ORBscan IIz<sup>®, Bausch & Lomb), optical low-coherence reflectometry (OLCR) biometry (Lenstar<sup>®, Haag-Streit), and Castroviejo calipers. Methods: Measurements on 72 eyes of 36 patients that underwent refractive surgery were measured using ORBscan<sup>®, Lenstar<sup>®, and calipers and compared. Ocular biometry parameters used in this study included the WTW, central corneal thickness, anterior chamber depth (ACD), keratometry, and pupil size. Results: The WTW measurements using ORBscan<sup>® and calipers (11.57 ± 0.35 mm and 11.58 ± 0.34 mm, respectively) were statistically similar. However, the measurement using Lenstar<sup>® (12.05 ± 0.40 mm) was significantly greater than with the other methods (<em>p</em> < 0.001). Central corneal thickness and keratometry measurements using ORBscan<sup>® were greater than when using Lenstar<sup>® (<em>p</em> = 0.01 for both). ACD and pupil size measurement using Lenstar<sup>® were greater than when using ORBscan<sup>® (<em>p</em> < 0.001 for both). Conclusions: Because WTW and ACD measurements using Lenstar<sup>® were greater than when using ORBscan<sup>® and calipers, unexpected high-vaulting may be observed due to the selection of a larger-sized posterior chamber phakic intraocular lens. Therefore, the differences in measurements obtained when using these methods should be considered. J Korean Ophthalmol Soc 2014;55(5):656-661
폐자원 및 바이오매스를 이용한 에너지자립 마을 구축에 관한 연구
이택관,이종연,김영준 유기성자원학회 2011 유기물자원화 Vol.19 No.2
This paper introduces about the study on the construction of zero energy villages in Korea using waste and biomass, and explains how to analyze the quantity of various resources from agriculture,livestock industry, forestry, and food waste with a village as a unit. Finally, three different scenarios for the construction of zero energy villages were suggested, based on the presumed amount of energy per each town. 본 연구는 국내에서 추진중인 에너지자립도 제로마을의 구축을 위하여 다양한 바이오매스의 활용방안에 대하여 소개하였고, 각 지역에서 발생하는 바이오매스의 활용가능성을 구체적으로 구현하고자 마을단위에서 음식물류폐기물, 가축분뇨, 각종 임업 및 산림폐기물의 생성량 및 그 현황을 조사, 분석하였으며, 마을단위별 추정 에너지량을 바탕으로 에너지 자립마을 조성을 위한 3가지 시나리오를 설정하였으며, 이를 기준으로 행정단위별 100% 에너지자립마을의 크기 및 규모를 분석하였다.
제주도 매립장 침출수 중 유기물의 효율적 처리를 위한 광촉매 분해 반응의 응용
이창한,이택관,조은일,감상규 한국환경과학회 2022 한국환경과학회지 Vol.31 No.8
In order to photocatalytically treat organic matter (CODCr) and chromaticity effectively, chemical coagulation and sedimentation processes were employed as a pretreatment of the leachate produced from landfill in Jeju Island. This was performed using FeCl3・6H2O as a coagulant. For the treated leachate, UV/TiO2 and UV/TiO2/H2O2 systems were investigated, using 4 types of UV lamps, including an ozone lamp (24 W), TiO2 as a photocatalyst, and/or H2O2 as an initiator or inhibitor for photocatalytic degradation. In the chemical coagulation and sedimentation process using FeCl3・6H2O, optimum removal was achieved with an initial pH of 6, and a coagulant dosage of 2.0 g/L, culminating in the removal of 40% CODCr and 81% chromaticity. For the UV/TiO2 system utilizing an ozone lamp and 3 g/L of TiO2, the optimum condition was obtained at pH 5. However, the treated CODCr and chromaticity did not meet the emission standards (CODCr: 400 mg/L, chromaticity: 200 degrees) in a clean area. However, for a UV/TiO2/H2O2 system using 1.54 g/L of H2O2 in addition to the above optimum UV/TiO2 system, the results were 395 mg/L and 160 degrees, respectively, which were within the emission standard limits. The effect of the UV lamp on the removal of CODCr, and chromaticity of the leachate decreased in the order of ozone (24 W) lamp > 254 nm (24 W) lamp > ozone (14 W) lamp > 254 nm (14 W) lamp. Only CODCr and chromaticity treated with the ozone (24 W) lamp met the emission standards.