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고온초전도 직류 케이블용 절연재료인 PPLP의 직류 및 임펄스 절연 특성
김우진,방만식,김해종,조전욱,김상현,Kim, Woo-Jin,Pang, Man-Sik,Kim, Hae-Jong,Cho, Jeon-Wook,Kim, Sang-Hyun 한국전기전자재료학회 2013 전기전자재료학회논문지 Vol.26 No.7
To realize the high-Tc superconducting (HTS) DC cable system, it is important to study not only high current capacity and low loss of conductor but also optimum electrical insulation at cryogenic temperature. A model HTS DC cable system consists of a HTS conductor, semi-conductor, cooling system and insulating materials. Polypropylene laminated paper (PPLP) has been widely adopted as insulating material for HTS machines. However, the fundamental insulation characteristics of PPLP for the development of HTS DC cable have not been revealed satisfactorily until now. In this paper, we will discuss mainly on the breakdown characteristics of 3 sheets PPLP in liquid nitrogen ($LN_2$). The characteristics of the diameter, location of butt-gap, distance between butt-gap length, pressure effect, polarity effect under DC and impulse voltage were studied. Also, the DC polarity reversal breakdown voltage of mini-model cable was measured in $LN_2$ under 0.4 MPa.
난치성 신생혈관 녹내장에서 유리체강내 베바시주맙과 구후 트리암시놀론 동시 주사 효과
김우진,정진구,유인천,이동욱,Woo-Jin Kim,Jin-Gu Jeong,In-Cheon You,Dong-Wook Lee 대한안과학회 2010 대한안과학회지 Vol.51 No.4
Purpose: To identify the regression of neovascularization and relief of other symptoms after intravitreal bevacizumab and retrobulbar triamcinolone injection in neovascular glaucoma patients with no possibility of visual acuity recovery. Methods: A total of 15 eyes in 15 patients with neovascular glaucoma, who had no possibility of visual acuity recovery and could not be treated with surgical intervention despite pain from October 2008 to May 2009, were reviewed retrospectively. Changes in degree of pain, conjunctival injection, revascularization, and visual acuity were evaluated after injection. Results: Ten of the 15 (67%) neovascular glaucoma patients were male, with a mean age of 62.50±12.79 years. The most common prediposing ocular disease was diabetic retinopathy (9; 60%), and the others were central retinal vein occlusion (4: 26%), central retinal artery occlusion (1; 7%), and uveitis (1; 7%). Change in intraocular pressure was significant (p<0.001), as were decreases in the degrees of pain and conjunctival injection (p<0.001, <0.001) after the injections. Regression of neovascularization continued in 13 patients (87%) after two months. Conclusions: Intravitreal bevacizumab and retrobulbar triamcinolone injection is a safe intervention that can substantially relieve pain experienced by neovascular glaucoma patients. J Korean Ophthalmol Soc 2010;51(4):568-574
백내장 수술 후 발생한 안내염 환자에 관한 8년간의 고찰
김우진,권의용,이동욱,조남천,Woo Jin Kim,Eui Yong Kweon,Dong Wook Lee,Nam Chun Cho 대한안과학회 2008 대한안과학회지 Vol.49 No.11
Purpose: To estimate the annual incidence rate, evaluate any changes, analyze the microbiologic spectrum of infecting organisms, antibiotic susceptibility, and factors associated with visual outcomes of postoperative endophthalmitis following cataract surgery over an 8-year period. Methods: A retrospective investigation of direction, sex, age, culture results, interval duration, and initial visual acuity of 29 patients with endophthalmitis following cataract surgery was conducted from January 2000 to December 2007. The study was divided into two 4-year periods, with patients categorized into either Group 1 or 2. Results: The incidence rate was 0.359%, the major infective organism was Staphylococcus epidermidis, and no significant change was observed during the 8-year period. Vancomycin retained efficacy in all cases, but increased resistance occurred with ciprofloxacin during the 8 years. Increased visual acuity after treatment was greater in Group 2 and the interval from onset of ocular symptoms to ophthalmic consultation was shorter in Group 2, although a statistical significance was not demonstrated. Conclusions: Vancomycin remains effective for patients with endophthalmitis following cataract surgery. Patients who initially had good visual acuity showed greater improvement. However, sex, age, or whether or not the patients had a vitrectomy operation, were not statistically significant factors in the improvement of visual acuity. J Korean Ophthalmol Soc 2008;49(11):1771-1778