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유리체강내 트리암시놀론 주입술로 호전된 임신 중 발생한 보그트-고야나기-하라다 병 1예
곽현덕,임성협,김현웅,윤일한,이호영,Hyun Duck Kwak,MD,Sung Hyup Lim,MD,Hyung Woong Kim,MD,PhD,Il Han Yun,MD,PhD,Ho Young Lee,MD 대한안과학회 2013 대한안과학회지 Vol.54 No.10
Purpose: To report a case of Vogt-Koyanagi-Harada (VKH) disease in a pregnant patient treated with intravitreal triamcinolone injection. Case summary: A 21-year-old female in the 19th week of gestation presented with bilateral blurring of vision associated with mild headache and tinnitus. Her initial best corrected visual acuity was 0.15 in the right eye and 0.3 in the left eye. Multiple serous retinal detachment and anterior chamber inflammation were observed, and VKH disease was diagnosed. Because of her pregnancy, the patient did not want high-dose systemic prednisolone therapy which may cause an abortion or low birth weight infant when used in a pregnant patient. Therefore, an intravitreal triamcinolone (4 mg/0.1 ml) injection was given in the right eye and topical steroid eye drops were used in the left eye. After 1 day, serous retinal detachment was significantly decreased and anterior chamber inflammation disappeared in the right eye. After 1 week, no serous retinal detachment was observed. In the left eye, serous retinal detachment was decreased after using steroid eye drops. After 10 days, serous retinal detachment disappeared but anterior chamber inflammation was still observed. After 1 month, best corrected visual acuity was 1.0 in both eyes and serous retinal detachment had not recurred. On follow-up, VKH disease had not recurred and a healthy normal weight infant was delivered. Conclusions: Intravitreal triamcinolone injection is an effective and safe treatment for VKH disease in pregnant women.
Static Characteristics of Micro Gas-Lubricated Journal Bearings with a Slip Flow
곽현덕(Hyun-Duck Kwak),이용복(Yong-Bok Lee),김창호(Chang-Ho Kim),이남수(Nam-Soo Lee),최동훈(Dong-Hoon Choi) 한국트라이볼로지학회 2002 한국트라이볼로지학회 학술대회 Vol.35 No.-
The fluid mechanics and operating conditions of gas-lubricated journal bearings in micro rotating machinery such as micro polarization modulator and micro gas turbine are different from their larger size ones. Due to non-continuum effects, there is a slip of gas at the walls. Thus in this paper, the slip flow effect is considered to estimate the pressure distribution and load-carrying capacity of micro gas-lubricated journal bearings as the local Knudsen number at the minimum film thickness is greater than 0.01. Based on the compressible Reynolds equation with slip flow, the static characteristics of micro gas-lubricated journal bearings are obtained. Numerical predictions compare the pressure distribution and load capacity considering slip flow with the performance of micro journal bearings without slip flow for a range of bearing numbers and eccentricities. The results clearly show that the slip flow effect on the static characteristics is considerable and becomes more significant as temperature increases.