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이정규,정동원,이창해,육운수,Lee, Jong Kyu,Jeong, Dong Won,Lee, Chang Hae,Yook, Woon Soo 대한토목학회 1994 대한토목학회논문집 Vol.14 No.6
The results of laboratory experiments on the clear-water scour of cohesionless bed sediment for three types of pier shape were presented. According to the experimental data, the local scouring around the pier was initiated at $V/V_c=0.4{\sim}0.5$ and $Fr_p{\fallingdotseq}0.2$, and the relative local scour depths linearly increased with respect to the velocity ratio and the pier Froude number. The relative scour depth had the linear relationship with ${\tau}_r$ for ${\tau}_r$ < $10^{-4}$, but it tends to become constant for ${\tau}_r$ > $10^{-4}$, irrespective of ${\tau}_r$. And also the relative scour depths showed the close relationship with both the geometric standard deviation and the pier shape. 본 연구에서는 3가지 교각형상에 대하여 국부적 정지상세굴에 대한 실험결과를 분석하였다. 실험결과에 의하면 교각의 세굴은 $V/V_c=0.4{\sim}0.5$, $Fr_p{\fallingdotseq}0.2$일 때 시작되었고 상대세굴심은 유속비와 교각푸르드수와의 관계에서 선형적으로 증가하였다. 또한 상대세굴심은 ${\tau}_r$ < $10^{-4}$일 때는 선형적으로 증가하지만 ${\tau}_r$ > $10^{-4}$이 되면 일정해지는 경향을 가지며 모래의 기하표준편차(${\sigma}_g$)와 교각형상과도 깊은 관계가 있었다.
이정규,김호영,조호균,Jeong Kyu Lee,Ho Young Kim,Ho Kyun Cho 대한안과학회 2011 대한안과학회지 Vol.52 No.5
Purpose: This study was performed to investigate the potential damage to white rabbit retinas caused by an operating microscope light. Methods: A total of 18 white rabbits were exposed to the light of an operating microscope for 60 minutes. Fundus examination, fluorescein angiography (FAG), and electroretinogram (ERG) were performed before exposure and 1 hr, 1 day, 7 days and 14 days afterward to allow for serial comparisons. Light and electron microscopic examinations were performed to evaluate the changes in the rabbit retinas over time. Results: Signs of retinal damage upon fundus examination and FAG were not found before or after exposure to the light of an operating microscopy. ERG, however, showed significant reduction in the dark-adapted rod response 1 hour after light exposure, and significant decline in the amplitude of the maximal combined response a- and b-wave 1 day after light exposure in the rabbit retinas. ERG findings returned to the pre-exposure level after 2 weeks. Ultrastructural injury to the photoreceptor outer segments and the retinal pigmented epithelium, observed using transmission electron microscopy, recovered to the pre-exposure state after 2 weeks. Conclusions: The risk of retinal damage should be considered as an early result of exposure to the light of an operating microscope, even in normal retinal findings. J Korean Ophthalmol Soc 2011;52(5):603-609