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- 저자 : 안재환 ( Jae-hwan Ahn ) (검색결과 69 건)
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급성내경동맥폐쇄로 인한 제3뇌신경 불완전마비를 동반한 안동맥폐쇄
안재환,이슬기,김현웅,Jae Hwan Ahn,MD,Sul Gee Lee,MD,Hyun Woong Kim,MD 대한안과학회 2009 대한안과학회지 Vol.50 No.4
Purpose: We report a case of ophthalmic artery occlusion with third nerve paresis in the left eye due to acute occlusion of the left ICA. Case summary: A 37-year-old man visited our emergency room with “black out” in the left eye, headache, and nausea. The corrected visual acuity was 20/25 in the right eye, and hand motion in the left eye. In the left eye, a relative afferent papillary defect was noted, with an intraocular pressure of six mmHg. Twenty prisms of exotropia in the primary position was observed, and ocular motor examination revealed limitations of supraduction, infraduction, and adduction in the left eye, suggesting third nerve palsy of the left eye. Fundus examination revealed a pale retina in the macula of the left eye. Brain MRI demonstrated multifocal faint low densities in the left caudate nucleus as well as the frontal and parietal lobes. CT angiography and four-vessel angiography demonstrated complete occlusion in the proximal part of the left internal carotid artery ICA. After five months the corrected visual acuity of the left eye improved to 20/200. The 20 prism diopters of exotropia persisted, and ocular motor examination revealed only a mild limitation of adduction in the left eye. J Korean Ophthalmol Soc 2009;50(4):624-629
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단안 선천 상사근마비 환자에서 하사근절제술, 후전술, 전치술의 효과 비교
안재환,이슬기,Jae Hwan Ahn,Sul Gee Lee 대한안과학회 2010 대한안과학회지 Vol.51 No.1
Purpose: To compare the clinical outcomes of myectomy, recession, and anterior transposition (AT) of the inferior oblique muscle in congenital unilateral superior oblique palsy. Methods: A total of 40 patients who were followed for longer than three months postoperatively and, who underwent inferior oblique myectomy, recession, or AT were evaluated retrospectively. Results: We compared the result of inferior oblique myectomy, recession, and AT in congenital unilateral superior oblique palsy. The decreased amounts of inferior oblique overaction (IOOA) were 2.24±0.67, 2.00±0.76, 3.00±1.15 for myectomy, recession, and AT, respectively. Improvement of superior oblique underaction was 0.80±0.66, 0.86±0.83, 1.00±0.58, and the changes in hyperdeviation were 10.96PD, 8.25PD, 14.86PD for myectomy, recession, and AT, respectively. There were no significant differences among the surgical methods. The proportion of patients who showed IOOA in the contralateral eye after operation were 20.0% in myectomy, 25.0% in recession, and 57.1% in AT. Conclusions: The efficacies of myectomy, recession, and AT of inferior oblique muscle in the congenital unilateral superior oblique palsies showed no significant differences among methods. The AT group tended to show a larger effect than did the other methods, along with a high development percentage of contralateral eye IOOA. Based on these results, AT of the IO shoud be selectively chosen in more severe cases. J Korean Ophthalmol Soc 2010;51(1):76-80
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안재환(Jae Hwan Ahn),윤상린(Sang Leen Yun),김석구(Seog Ku Kim) 大韓環境工學會 2012 대한환경공학회지 Vol.34 No.7
본 논문에서는 하천구역 내에서의 경작활동으로 인한 비점오염원 유출특성을 파악하기 위하여 팔당상수원보호구역의 경기도 광주시에 위치한 G지역(논, 비닐하우스)과 남양주시의 S지역(노지 밭)을 선정하여 강우 시 현장조사를 수행하였다. 담수기능을 갖는 논은 강우강도에 따라 유출유량이 완만한 증감을 나타내어 제내지에 위치한 논의 유출특성과 유사한 현상을 보여주었다. 그러나 비닐하우스와 노지 밭 모두 강우강도에 비례하여 유출유량이 급격히 증가하는 현상을 보여주었다. 논, 비닐하우스 및 노지 밭의 BOD 평균 유출농도는 각각 2.0 mg/L, 2.8 mg/L, 7.9 mg/L로서 노지 밭의 유출농도가 높게 나타났으며, 강우사상에 따른 토양의 유출에 기인하여 SS, T-N 및 T-P 유출농도도 노지 밭이 가장 높은 것으로 조사되었다. 경작지별 배출부하량을 산정한 결과, 논의 T-N 배출부하량이 1,793.9 kg/year으로 밭에 비해 높게 나타났으며, 노지 밭의 SS 배출부하량은 69,704 kg/year로 전체 배출부하량의 70% 이상을 차지하는 것으로 산정되었다. The field study was carried out to investigate runoff characteristics of non-point source (NPS) by cultivation activity in river district. Two sites were selected mainly as G region (paddy field, green house), located in Kwangju, Gyeonggi Province, and S region (ordinary field), located in Namyangju, Gyeonggi Province, those belong to Paldang reservoir watershed. The paddy field with water storage capacity showed a slow increase in runoff as rainfall intensity increases. Meanwhile, both green house and ordinary filed revealed a rapid increase. The average BOD runoff concentration of paddy field, green house, and ordinary field was 2.0 mg/L, 2.8 mg/L, 7 9 mg/L, respectively. It indicates that ordinary field shows the highest value in BOD, SS, T-N, and T-P concentration due to the soil loss during rainfall. As a result of runoff load estimation according to the field, a T-N runoff load of paddy field was 1,793.9 kg/year, higher than that of ordinary field. It was estimated that a SS runoff load of ordinary field was 69,704 kg/year and accounts for more than 70% of overall runoff load.
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용량가변을 위한 이중 바이패스 적용 히트펌프의 난방 성능특성
안재환(Jae Hwan Ahn),주영주(Youngju Joo),윤원재(Won Jae Yoon),강훈(Hoon Kang),김용찬(Yongchan Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
A small room air-conditioner or a chiller for constant temperature bath usually uses a constant speed compressor. The constant speed compressor is operated with on/off control for variable capacities. However, the on/off control has several disadvantages such as energy loss and low compressor efficiency. To avoid these problems, a bypass system can be suggested for continuous operation. In this study, a dual bypass system having a hot gas bypass system and a liquid bypass system was adopted in a heat pump. The performances of the hot gas bypass system and the liquid bypass system in the heat pump were investigated experimentally with the variation of the expansion valve opening.
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안재환(Jae Hwan Ahn),윤상린(Sang Leen Yun),김석구(Seog Ku Kim),박윤식(Youn Shik Park),임경재(Kyoung Jae Lim) 大韓環境工學會 2012 대한환경공학회지 Vol.34 No.12
본 연구는 남한강과 북한강 유역 내 경작지 각 3개소(site A, B, C)를 대상으로 Web GIS-based VFSMOD System의 HUFF & SCS UH-based VFS Design Module을 적용하여 강우 시 경작지에서 유출되는 고형물질 유출저감을 모의하였다. 북한강 유역 내에 위치한 site A의 노지 밭의 토지경사도 5%, 강우 106.2mm 조건에서 고추 및 옥수수를 재배할 경우, 70% 이상의 고형물질 유출저감 효율을 얻기 위해서는 초생대 폭이 최소 0.5m 이상, 토지경사도 10%인 경우 70% 이상의 고형물질 유출저감 효율을 얻기 위해서는 초생대 폭이 최소 1.0∼1.5m 이상 유지해야 한다. 남한강 유역 내에 site B의 노지 밭의 토지경사도 5%, 강우량 95.1mm 조건에서 토마토 및 땅콩을 재배할 경우, 70% 이상의 고형물질 유출저감을 위해서는 초생대의 폭이 최소 0.5m, 토지경사도 10%인 경우 50% 이상의 고형물질 유출저감을 위해서는 최소 1.0m 이상의 폭을 갖는 초생대를 설치 해야 하는 것으로 나타났다. 남한강 유역 내에 site C의 노지 밭의 토지경사도 5%, 강우량 102.6mm 조건에서 고구마 및 콩을 재배할 경우, 64.0% 이상의 고형물질 유출저감을 위해서는 초생대의 폭이 최소 1.0m, 초생대를 설치해야 하는 것을 분석 되었다. 또한, 동일한 조건에서 강우지속시간 2시간의 강우량을 151.2mm로 증가시킬 경우, 62.0% 이상의 고형물질 유출저감을 위한 초생대의 최소 폭은 1.0m 이상 설치해야 하는 것으로 분석되었다. 초생대 시설은 경작지와 같은 토지이용 시 친환경적인 고형물질 유출저감 방안으로 검토될 수 있으며, Web GIS-based VFSMOD System을 이용하여 다양한 토지특성과 강우 사상을 반영하여 적정한 규모의 초생대 설계가 가능할 것으로 분석되었다. The study was performed to simulate the reduction efficiency of suspended solids (SS) for cultivated land located at riverine area at the Namhan River and the Bukhan River watershed sites (site A, B, C) under the rainfall conditions using HUFF & SCS UH-based VFS Design module of Web GIS-based VFSMOD System. The study indicates that the field 5% sloped, located at Bukhan River watershed (site A), requires at least 0.5m width of Vegetative Filter Strip (VFS) to reduce 70% of SS while the field 10% sloped requires the at least 1.0∼1.5m width of VFS to reduce 70% SS, under the condition 106.2mm of rainfall event and bell pepper or corn of crops. Against the conditions 95.1mm of rainfall event and sweet potato or soy bean of crops, the field 5% sloped, located at Namhan River watershed (site B) requires at least 0.5m width of VFS to reduce 70% of SS while the field 10% sloped requires at least 1.0m width of VFS to reduce 50% SS. The crops sweet potato and soy bean are cultivated in the site C, located at Namhan River watershed, 1m of VFS is capable of 64.0% and 62.0% of SS reduction against 102.6mm and 151.2mm rainfall conditions respectively, for the 5% sloped field. The result supports that VFS is one of most potential methods to reduce SS from cultivated area, which is environment-friendly hydrologic structure. The VFS design, however, needs to be simulated before its installation in the field, the simulation needs to consider not only various characteristics of the field but also different conditions affecting the VFS, using a model capable to consider a lot of factors.
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안재환(Jae-Hwan Ahn),김미경(Mee-Kyung Kim),이미경(Mi-Kyung Lee) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Sludge reduction by the sub-critical wet air oxidation (SCWAO; at <250℃ and 30 atm) was studied to find out the optimal operational parameters such as time, temperature, pressure, and oxidant dose. The initial suspended solids (SS) and total chemical oxygen demand (TCOD) concentrations of sludge used for the laboratory-scale experiment were 6,500 and 7,500 ㎎/L, respectively. When the temperature changed from 180 to 260℃ with 20℃ intervals, higher temperature was shown with higher TCOD removal efficiency at around 75%, and the soluble chemical oxygen demand (SCOD) was increased abruptly up to 2,000 ㎎/L within 10 min. At the same time, SS was decreased as SCOD increasing, implying organicsolids were liquefied during the process, with about 70% of SS decomposed within 10 min, whereas the organic acid concentration increased rapidly within 20 min. The higher temperature also resulted in higher organic acid concentration. Based on the results from the lab-scale experiments, a pilot plant with the capacity of 3 ㎥/d was designed and then operated at 60 min hydraulic retention time (HRT), 220℃, and <30 atm. Air was injected into the WAO reactor for the higher oxidation efficiency, at the flow rate of 50% of the stoichiometric oxygen requirement. The removal efficiencies for total solids and TCOD at 220℃, 30 atm, and 60 min HRT were over 70% and 40%, respectively, and the yields of volatile fatty acids (VFAs) and SCOD were 115 g VFAs/㎏ SS and 730 g SCOD/㎏ SS, respectively.
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