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유리체절제술과 내경계막제거술 후 9개월에 지연 폐쇄된 특발성 황반원공 1예
이종헌,김호윤,박성후,이지은,변익수,Jong Heon Lee,Ho Yun Kim,Sung Who Park,Ji Eun Lee,Ik Soo Byon 대한안과학회 2014 대한안과학회지 Vol.55 No.5
Purpose: To report a case of delayed idiopathic macular hole closure after vitrectomy, internal limiting membrane peeling, and gas tamponade. Case summary: A 69-year-old female complained of visual disturbance in her left eye. At presentation, her visual acuity was 20/100 in the left eye. Fundus examination and optical coherence tomography revealed a full-thickness macular hole 489 μm in diameter as well as posterior vitreous detachment. Hence, vitrectomy, concurrent cataract surgery, internal limiting membrane peeling and gas tamponade were performed. One month postoperatively, the hole remained unclosed, although decreased in size to 378 μm. At 2 months, cystoid macular edema developed and postoperatively the hole diameter decreased gradually to 311 μm, 252 μm and 156 μm at 2, 3, and 5 months, respectively. Finally, the hole was closed upon the resolution of macular edema at 9 months. However, the visual acuity of 20/100 remained unchanged. Conclusions: Delayed closure of holes which may be related to cystoid macular edema, can develop after macular hole surgery. J Korean Ophthalmol Soc 2014;55(5):775-779
이종헌,홍창희,이화용,Lee, Jong-Heon,Hong, Chang-Hui,Lee, Hwa-Yong 대한전자공학회 1979 전자공학회지 Vol.16 No.3
본 논문에서는 바나디움 주화물을 사용한 새로운 반도체 소자인 C.T.R을 제조하여 그외 전기적 특성을 조사하였다. 그 실험결과는 다음과 같다. (1) 제조될 C.T.R의 저항급변계수 는 3정도였고, (2) 의 값은 환원시간과 급냉시간에 크게 의존하였으며, (3) 의 큰 값을 갖는 C.T.R은 짧은 switching현상을 갖는다. In this paper, we fabricated a samiconductor C. T. R.(Critical Temperature Resisthor) using vanadium-oxides as material and measured its electrical characteustics. Experimental results are as follows; (1) The abrupt resistance change coefficient of the fabricated C. T, R., , is approximately 3 and (2) the value of depends largely on the reducing time and quenching time and also (3) the C. T, R. with larger value of has shorter switching time.
이종헌 ( Jong-heon Lee ) 한국산업융합학회 2006 한국산업융합학회 논문집 Vol.9 No.3
In this paper, the stability of SA(Spectral Acceleration) fragility curves is studied for the two sets of elastic modulus of concrete. In doing that, general purpose structural analysis program and generally used probability density function are used. The results of structural analysis are represented by Bernoulli distribution which says damage or no damage. By the use of Maximum Likelihood Method, two parameters of lognormal distribution - median and standard deviation - are found. With them, the fragility curves are constructed.