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원발성개방각녹내장 환자의 백내장수술 중 나타난 악성녹내장 유사 현상 1예
이상엽,박종운,Sang Yeop Lee,Jong Woon Park 대한안과학회 2010 대한안과학회지 Vol.51 No.8
Purpose: Malignant glaucoma is a rare complication of anterior segment surgery. The authors present a case of a malignant glaucoma-like phenomenon during cataract surgery in a primary open-angle glaucoma (POAG) patient. Case summary: A 74-year-old man with POAG underwent a cataract surgery in his left eye. After phacoemulsificiation, sodium hyaluronate was used to form the capsular bag for intraocular lens implantation. Following this procedure, the capsular bag space and anterior chamber became shallow. Intraocular pressure (IOP) elevated, and the shallowing of the anterior chamber and capsular bag space continued to a dangerous level. The surgical procedure was stopped and postponed for two days. After two days, IOL was successfully implanted in the posterior bag. Conclusions: Although the preoperative ophthalmologic examination failed to reveal a zonular problem, there was a possibility for a small area of zonular defect. A malignant glaucoma-like phenomenon was suspected to have occurred due to leakage of sodium hyaluronate or balanced salt solution into the vitreous through a small area of zonular dialysis. If a similar condition, occurs delayed surgery for IOL implantation would be more effective than vitrectomy or laser treatment. J Korean Ophthalmol Soc 2010;51(8):1150-1154
단안상전장애에 동반된 눈꺼풀처짐에서 눈꺼풀올림근을 이용한 이마근걸이술 1예
이상엽,김혜영,Sang Yeop Lee,Hye Young Kim 대한안과학회 2010 대한안과학회지 Vol.51 No.2
Purpose: For the correction of ptosis in monocular elevation deficiency (MED) patients, levator resection or frontalis sling operation with various materials has been used. The authors present a case of a monocular elevation deficiency patient who was treated for ptosis using the levator muscle as a frontalis sling. Case summary: A six-year-old male patient with left monocular elevation deficiency underwent a frontalis sling operation using a levator muscle. The patient had received left inferior rectus recession, left medial rectus resection and left lateral rectus recession with transposition. An upper eyelid skin crease incision was made, and the anterior surface of the levator muscle was exposed as far as the Whitnall ligament. A levator muscle flap was then formed from aponeurosis by incising the full width of the levator horizontally, just below the Whitnall ligament and anchored to the frontalis muscle. The surgical result was satisfactory as the preoperative MRD1 was 0.5 mm and the postoperative MRD1 was 2.5 mm. There were no complications such as keratitis or wound problems. Conclusions: The levator muscle flap can be an effective frontalis suspension material to correct ptosis in an MED patient with poor levator function. J Korean Ophthalmol Soc 2010;51(2):282-285
POLICY & ISSUES 기획특집_2 - 국내 배출권거래제 세부 운영방안 마련을 위한 과제
이상엽,Lee, Sang-Yeop 환경보전협회 2013 환경정보 Vol.403 No.-
국내 배출권거래제는 2015년 1월부터 도입된다. 정부는 그 동안 시행령을 마련하였고, 앞으로 기본계획과 할당계획을 확정할 예정이다. 기본계획과 할당계획은 구체적인 최종 세부 운영규칙과 관련된 사항이다. 각 운영요소의 대안별 선택 및 대안간 평가에 관한 실증적 검토, 운영요소 간 상호 연계 효과 등에 관한 최종적 점검이 필요하다.
이상엽,Lee, Sang-Yeop 한국작물보호협회 2010 자연과 농업 Vol.262 No.-
토양으로 전염되는 균행벽은 조기발견과 사전에 병해진단이 어려우며, 외부증상이 나타나 방제를 할 경우에도 치료보다는 주변 식물체에 감염 예방이 급선무이다.
GaN 고출력 증폭기의 초소형 레이다 적용에 관한 연구
이상엽,이재웅,Lee, Sang_yeop,Yi, Jaewoong 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.5
Trend on high-power GaN(Gallium Nitride) SSPA(Solid-State Power Amplifier) and its availability in miniature radar systems are presented. There are numerous studies on high-power GaN devices since they have some characteristics of high-breakdown voltage, high power density, and high-temperature stability. Recent scaled GaN technology makes it possible to apply it in SSPAs for W- and G-band applications, with increasing its maximum frequency. In addition, it leads to downsizing and power-efficiency improvement of SSPAs, which means that GaN SSPAs can be available in miniature radar systems. This study also shows radar performance and comparison in the case of using such SSPAs at three frequency bands of Ku, Ka, and W. Finally, we demonstrate prospects of scaled GaN SSPAs in future miniature radar systems.