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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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열펌프의 난방운전시 핫가스 바이패스에 따른 성능 특성에 관한 실험적 연구
안재환(Jae Hwan Ahn),주영주(Youngju Joo),조일용(Ilyong Cho),강훈(Hoon Kang),김용찬(Yongchan Kim),최종민(Jongmin Choi) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
When the suction pressure of compressor decreases under its limit, the compression ratio is increased causing the malfunctions of compressor. As the method to decrease the compression ratio, hot gas bypass system is usually adopted in heat pump system. In the hot gas bypass system, the discharged gas from the compressor is bypassed into the compressor suction, which causes the increase of suction pressure and the decrease of compression ratio. In this study, the characteristics and performances of the hot gas bypass system in heat pump was investigated experimentally with a variation of the bypass flow rate ratio. With the increase of the bypass rate ratio, the compressor suction pressure was increased, even though the total capacity and COP was decreased. From the analysis of the experimental results, the optimum pressure control algorithm was suggested in this study.
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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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실험실 규모의 음향정재파를 이용한 수중의 입자분리 특성
안재환(Jae Hwan Ahn),강성원(Sung Won Kang),안광호(Kwang Ho Ahn),김이태(I Tae Kim),김석구(Seog Gu Kim),안호상(Ho Sang Ahn),이영섭(Young Sup Lee) 大韓環境工學會 2012 대한환경공학회지 Vol.34 No.12
실험실 규모의 음향정재파 장치를 이용하여 수체에 포함된 입자의 분리특성을 알아보았다. 음향정재파는 음파 또는 초음파와 유사한 파장으로 반사벽에 의해 발생된 파가 돌아오면서 일정한 파장을 형성한다. 이때 수중에 분산되어 있던 미세한 입자들은 음압이 0인 파장의 절점(node) 부분에 모이게 된다. 주파수 28.0kHz와 1.0MHz의 음향정재파 트랜스듀서를 이용 하였고, 수체에 포함된 입자는 평균 입경 6.8μm의 카올린과 100.5μm의 레드머드를 사용하였다. 수체 내에 음향정재파가 형성되면 발생된 파장에 의한 음압으로 수온이 0.15∼0.20℃/min 정도 상승된다. 카올린과 레드머드의 초기 농도는 0.1, 0.2, 0.3, 0.4, 0.5g/L로 동일하게 제조하였다. 1.0MHz의 주파수에서 5분경과 후 음향정재파가 가장 뚜렷하게 형성되었을 때의 반응조내의 탁도 제거율은 카올린은 18.2%∼56.2%로, 입경이 큰 레드머드는 23.0%∼53.6%의 분리효율을 나타내었다. 28.0kHz 주파수에서는 입자분리가 이루어지지 않았다. Characteristics of particle separation in water using labscale acoustic standing wave were studied. Acoustic standing wave is similar to either sound wave or ultrasonic, which makes a constant wave while returning to the origin by reflector. During that time, particulates dispersed in water are collected on the node of wave, where a sound pressure is zero. Acoustic standing wave transducer as of 28.0kHz and 1.0MHz were utilized and 6.8μm kaolin and 100.5μm redmud in average diameter were used as experimental materials in water. Once acoustic standing wave are generated in water, water temperature rises by 0.15∼0.20℃/min due to a sound pressure. Initial concentration of kaolin and redmud were controlled to have same as of 0.1, 0.2, 0.3, 0.4, 0.5g/L, respectively. Removal efficiency of the turbidity in a reacting chamber after 5 minutes, when acoustic sound wave was formed in most distinct, was measured to have 18.2∼56.2% for kaolin and 23.0∼53.6% for redmud at 1.0MHz. Particle separation was not observed at 28.0 kHz.
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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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