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이종헌,강건,배춘익,Lee, J.H.,Kang, K.,Bae, C.E. 한국마린엔지니어링학회 1999 한국마린엔지니어링학회지 Vol.23 No.5
A UBET program is developed for determining flash the optimum sizes of preform and initial billet in plane-strain closed-die forging. The program consists of forward and backward tracing processes. In the forward program, flash, die filling and forging load are predicted. In backward tracing process the optimum dimensions of initial billet and preform are determined from the final-shape data based on flash design. Experiments are carried out with pure plasticine billets ar room temperature. The theoretical predictions of forging load and flow pattern are in good agree-ment with the experimental results.
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.
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(Jong Heon Lee),정재우(Jae Woo Jung),조성호(Seong Ho Jo),서제현(Je Hyun Seo) 대한검안학회 2015 Annals of optometry and contact lens Vol.14 No.4
Purpose: To report a surgical treatment for a case of uveitic glaucoma during pregnancy. Case summary: A glaucoma female to be pregnant with 26 weeks visited for our clinic, who had used anti glaucoma medication. At the initial examination, intraocular pressures (IOP) of right and left eye were 38, 30 mmHg, respectively. We performed selective laser trabeculoplasty of both eyes with no complication, and then IOPs of right and left eyes were decreased to 26, 23 mmHg, respectively. 1 week later, she came to our emergency department due to acute visual impairment. Her IOP was 45 mmHg in right eye with uveitis. We regard that she had uveitic component related to the stress of fetal cardiac abnormality and recent her husband’s car-accident. Afterall she underwent trabeculectomy because of sustained high IOP. After surgery, IOP was decreased to 5 mmHg in right eye with elevated bleb but anterior chamber was shallow. We waited for 3 days because overfilteration would be resolved. After all, we did bleb revision with air injection in anterior chamber. After surgery, that IOP was persisted 10-16 mmHg with cystic bleb. Conclusions: This study showed the course of glaucoma during pregnancy was various, and emotional stress can lead uveitic glaucoma in contrast to the studies showed an association with pregnancy and lower IOP. Also, gentle manipulation is needed for pregnant women, because of thinner and softer sclera in high myopia and pregnancy itself.