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황반부 장액성망막박리가 동반된 시신경유두소와의 수술적 치료 1예
류정완,나호,이원기,Jung-Wan Ryu,Ho Ra,Won-Ki Lee 대한안과학회 2010 대한안과학회지 Vol.51 No.1
Purpose: To report the clinical results of a planned vitrectomy, laser photocoagulation and gas tamponade for the treatment of serous macular detachment associated with optic disc pit. However, laser photocoagulation was performed on a postoperative outpatient basis for subretinal fluid. Case summary: A 13-year-old women presented with central visual disturbance in the left eye. Her best-corrected visual acuity (BCVA) was 0.16. On ophthalmic examination, the patient was diagnosed with optic disc pit combined with serous macular detachment. After 3 months, the serous macular detachment increased and visual acuity decreased to 0.1. Pars plana vitrectomy combined with complete posterior vitreous detachment was performed. After intravitreal injection of perfluorodecalin, internal drainage of the subretinal fluid using the back flush needle around the optic disc pit was performed, but the fluid was not drained. The planned intraoperative photocoagulation was not performed due to a large serous macular detachment. Gas tamponade was performed and a facedown position was maintained for 1 week followed by laser photocoagulation. The subretinal fluid was completely absorbed and visual acuity was improved. In addition, recurrence was not observed throughout the follow-up period. J Korean Ophthalmol Soc 2010;51(1):155-158
류정완,이영춘,이세엽,Jung-Wan Ryu,Young-Chun Lee,Se-Youp Lee 대한안과학회 2005 대한안과학회지 Vol.46 No.8
Purpose: To report a 38-year-old woman who showed esotropia and diplopia after LASEK surgery. Methods: A 38-year-old mildly myopic woman, who didn`t ordinarily need glasses or contact lenses, visited our clinic complaining of sudden onset of esotropia and diplopia following LASEK. Although she had had rarely intermittent esotropia in the past, her orthophoria had been maintained usually. The refractive error, -2.00 Dsph=-0.75 Dcyl×172 A in the right eye and -2.50 Dsph=-0.75 Dcyl×27 A in the left eye before LASEK. was improved to -0.50 Dsph -0.25 Dcyl×48 A in the right eye and -0.25 Dsph in the left eye after LASEK. However, she showed acute esotropia of 40 prism diopters (PD) at near and 30 PD at distance and diplopia. The Worth 4 dot test and Bagolini striated lens test indicated left suppression. In the Titmus stereo test, she exhibited loss of stereoacuity. Results: Her esotropia persisted for two months after first visiting our clinic, so we performed surgery of unilateral lateral rectus muscle resection and medial rectus muscle recession. After strabismus surgery, she showed orthophoria and the diplopia disappeared, while fusion and stereoacuity were regained. Conclusions: The clinical course of this patient suggested that recovery of accommodative need convert esophoria to esotropia. Therefore we recommend meticulous preoperative evaluation of strabismus in all candidates for refractive surgery.
브로일 버너의 화염안정성과 배기배출물에 관한 실험적 연구
정용기(Yong-Ki Jeong),류정완(Jung-Wan Ryu),위재혁(Jae-Hyug Wie),임재범(Jae-Beom Lim),김양호(Yang-Ho Kim),양대봉(Dae-Bong Yang),김영수(Young-Soo Kim),장영준(Young-June Chang),전충환(Chung-Hwan Jeon) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
An experimental study was performed to investigate the effects of heat capacity and air excess ratio on CO emission characteristics of the broil burner in the gas oven range. Observations of flow characteristics occurring inside the both burner (general broil burner and a sheet metal burner), were investigated by measuring air excess ratio and CO emission characteristics. Combustion was achieved at the firing rate of 10,000~24,000Btuh, inlet pressure of 200~300㎜H2O. The primary air flow rate was found to be strongly dependent on the operating conditions, such as fuel flow rate. However air excess ratio calculated is constant without relation to fuel flow rate. There was a tendency that flame distance decreases as the air excess ratio increases because of momentum effect. In view of CO concentrations, there is a difference according to the heat capacity and flame guide. The effect of flame guide is great than the heat capacity.
정용기(Yong-Ki Jeong),김영수(Young-Soo Kim),이대래(Dae-Rae Lee),양대봉(Dae-Bong Yang),류정완(Jung-Wan Ryu),Alexander Yun,장영준(Young-June Chang),전충환(Chung-Hwan Jeon) 한국연소학회 2007 KOSCOSYMPOSIUM논문집 Vol.- No.-
An experimental study was performed to investigate the effects of mixing Quality, inlet pressure, nozzle diameter on CO emission and radiation characteristics in porous ceramic fiber radiant burners. Observations of combustion characteristics occurring inside the burner system which was insulated fiber mat, were investigated by measuring temperature, CO emission and radiation characteristics. Combustion was achieved at the firing rate of 88~99 ㎉/hr, inlet pressure of 100~250㎜H₂O. CO emissions were found to be strongly dependent on the operating conditions. There was a tendency that CO concentration increased as the firing rate increases. The reason for rise of CO concentration is that it becomes the relatively rich condition. The fiber burner exhibit significant both spectral intensity peaks in the bands at 2.5㎛ and 4.0㎛ relatively. There is a small difference in the variable mixing tube. However spectral intensity increased with the firing rate.
가스 쿡탑 버너에서 디자인 형상이 배기배출물에 미치는 영향
정용기(Yong Ki Jeong),김영수(Young Soo Kim),양대봉(Dae Bong Yang),김양호(Yang Ho Kim),류정완(Jung Wan Ryu),위재혁(Jae Hyug Wie),임재범(Jae Beom Lim),석준호(Jun Ho Seok),장영준(Young June Chang),전충환(Chung Hwan Jeon) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
An experimental study was performed to investigate the effects of configuration of burner and air excess ration on CO & NOx emission characteristics of the cooktop burners which are used extensively. In this study, the combustion characteristics were investigated with the variation of design factor of cooktop turners. The results showed that as the thermal input increases, flammable region go narrower. With the increase of loading height from the cap to grate, the CO emission decrease owing to the reduction of quenching by flame impingement on the load. Additionally, the CO emission increase with angle of main slot, however the NO emission is almost unaffected.
염공부하에 따른 세라믹 화이버 버너의 배기 배출물과 분광학적 특성에 관한 연구
정용기(Yong Ki Jeong),이대래(Dae Rae Lee),김영수(Young Soo Kim),양대봉(Dae Bong Yang),김양호(Yang Ho Kim),류정완(Jung Wan Ryu),Alexander Yun,위재혁(Jae Hyug Wie),장영준(Young June Chang),전충환(Chung Hwan Jeon) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
An experimental study was performed to investigate the effects of both non-perforated and perforated ceramic fiber mat on temperature, CO, NO emission and radiation characteristics in porous ceramic fiber radiant burners. Observations of combustion characteristics occurring inside the burner system which was insulated fiber mat, were investigated by measuring emission and radiation characteristics. Combustion was achieved at the excess air ratio of 0.9~2, heat capacity of 1000~3000㎉/h. The local temperature distribution inside the mat and near the glass surface as a function of the equivalence ratio can be reasonably interpreted by the relation of the heat balance in the mat and movement of the reaction zone. CO emissions were found to be strongly dependent on the operating conditions. There was a tendency that CO concentration decreased as the excess air ratio increases. The NO concentration is maximal at the excess air ratio of approximately 1. The both fiber burner exhibit significant both spectral intensity peaks in the bands at 2.5㎛ and 4.0㎛ relatively.