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COVID-19 mRNA 백신 주사 후 발생한 백내장 2예
윤은유,최재원,안민원,박민지 대한안과학회 2022 대한안과학회지 Vol.63 No.12
목적: COVID-19 mRNA 백신 주사 후 진행한 단안 백내장 2예를 보고하고자 한다. 증례요약: 2명의 환자가 mRNA 백신 후부터 시작된 단안의 시력저하를 주소로 내원하였다. 40세 남자 환자는 mRNA-1273 (ModernaⓇ, Cambridge, UK) 2차 주사 후부터 발생된 좌안 시력저하를 주소 내원하였으며 40세 여성 환자는 BNT162b2 (PfizerⓇ, New York, NY, USA) 3차 주사 후 발생한 양안 시력저하를 주소로 내원하였다. 두 증례 모두 안과적 과거력도 없었으며 안저검사에서 뚜렷한시신경병증이나 망막병증은 없었다. 수정체유화술 및 인공수정체 삽입술을 시행 후 2개월의 최대교정시력은 향상되었고 안압은 안정적으로 유지되었다. 결론: COVID-19 mRNA 백신 주사 후 백내장의 발생 및 진행 가능성을 고려해야 할 것으로 생각한다.
수분사법으로 제조된 순철 분말의 고압비틀림 성형 공정에 의한 치밀화 및 나노결정화
윤은유,이동준,김하늘,강희수,이언식,김형섭,Yoon, Eun-Yoo,Lee, Dong-Jun,Kim, Ha-Neul,Kang, Hee-Soo,Lee, Eon-Sik,Kim, Hyoung-Seop 한국분말야금학회 2011 한국분말재료학회지 (KPMI) Vol.18 No.5
In this study, powder metallurgy and severe plastic deformation by high-pressure torsion (HPT) approaches were combined to achieve both full density and grain refinement at the same time. Water-atomized pure iron powders were consolidated to disc-shaped samples at room temperature using HPT of 10 GPa up to 3 turns. The resulting microstructural size decreases with increasing strain and reaches a steady-state with nanocrystalline (down to ~250 nm in average grain size) structure. The water-atomized iron powders were deformed plastically as well as fully densified, as high as 99% of relative density by high pressure, resulting in effective grain size refinements and enhanced microhardness values.
고압비틀림 공정으로 제조된 구리-다이아몬드 초미세립 복합재료
윤은유,이동준,김택수,김형섭,Yoon, Eun-Yoo,Lee, Dong-Jun,Kim, Taek-Soo,Kim, Hyoung-Seop 한국분말야금학회 2012 한국분말재료학회지 (KPMI) Vol.19 No.3
In this work, powder metallurgy and severe plastic deformation by high-pressure torsion (HPT) approaches were combined to achieve both full density and grain refinement at the same time. Pure Cu powders were mixed with 5 and 10 vol% diamonds and consolidated into disc-shaped samples at room temperature by HPT at 1.25 GPa and 1 turn, resulting in ultrafine grained metallic matrices embedded with diamonds. Neither heating nor additional sintering was required with the HPT process so that in situ consolidation was successfully achieved at ambient temperature. Significantly refined grain structures of Cu metallic matrices with increasing diamond volume fractions were observed by electron backscatter diffraction (EBSD), which enhanced the microhardness of the Cu-diamond composites.
윤은유,박민지,최재원 대한안과학회 2023 대한안과학회지 Vol.64 No.8
Purpose: This study evaluated the efficacy and safety of subconjunctival bevacizumab injection after primary pterygium surgery. Methods: We performed a conjunctivo-limbal autograft after pterygium resection in 136 eyes of 128 patients with primary pterygium between December 2019 and July 2021. A subconjunctival bevacizumab injection of 2.5 mg (0.1 mL) was administered in the bevacizumab group but not in the control group (54 eyes of 48 patients). We compared pterygium recurrence rates between the two groups at 1 day, 1 week, 1 month, 3 months, 6 months, and 12 months after surgery. Results: Pterygium recurrence occurred in one eye (1.21%) in the bevacizumab group and five eyes (9.25%) in the control group. Additionally, fibrovascular tissue proliferation was suppressed in the bevacizumab group and no postoperative complications were observed. Conclusions: Pterygium recurrence occurred in one eye (1.21%) in the bevacizumab group and five eyes (9.25%) in the control group. Additionally, fibrovascular tissue proliferation was suppressed in the bevacizumab group and no postoperative complications were observed. 목적: 원발성 군날개절제술 후 베바시주맙을 주사하여 그 효과와 안전성을 알아보고자 하였다. 대상과 방법: 2019년 12월부터 2021년 7월까지 원발성 군날개 환자 128명 136안을 대상으로 군날개절제술 후 자가윤부결막이식술을시행하였고, 베바시주맙군(80명 82안)에서는 수술 후 1주 후 베바시주맙 2.5 mg (0.1 mL)을 결막하 주사하였으며, 대조군(48명 54안)에서는 시행하지 않았다. 수술 후 1일째, 일주일, 1개월, 3개월, 6개월, 12개월 경과 관찰하여 두 군에서 군날개의 재발률을 비교하였다. 결과: 베바시주맙군에서 1안(1.21%)에서 재발하였으며 대조군에서 5안(9.25%)에서 재발하였다. 또한 베바시주맙군에서 섬유혈관 조직의 증식이 억제되는 양상을 보였으며 수술 후 합병증은 관찰되지 않았다. 결론: 군날개수술 베바시주맙 결막하 주사는 군날개 재발을 억제하는데 효과가 있어 수술 후의 보조요법으로 잠재력이 있다고 생각한다.
고압비틀림 공정을 통한 급속응고 MgZn<sub>4.3</sub>Y<sub>0.7</sub> 합금 분말의 치밀화 및 기계적 거동
윤은유,채홍준,김택수,이종수,김형섭,Yoon, Eun-Yoo,Chae, Hong-Jun,Kim, Taek-Soo,Lee, Chong-Soo,Kim, Hyoung-Seop 한국분말야금학회 2010 한국분말재료학회지 (KPMI) Vol.17 No.3
In this paper, rapid solidified Mg-4.3Zn-0.7Y (at.%) alloy powders were prepared using an inert gas atomizer, followed by a severe plastic deformation technique of high pressure torsion (HPT) for consolidation of the powders. The gas atomized powders were almost spherical in shape, and grain size was as fine as less than $5\;{\mu}m$ due to rapid solidification. Plastic deformation responses during HPT were simulated using the finite element method, which shows in good agreement with the analytical solutions of a strain expression in torsion. Varying the HPT processing temperature from ambient to 473 K, the behavior of powder consolidation, matrix microstructural evolution and mechanical properties of the compacts was investigated. The gas atomized powders were deformed plastically as well as fully densified, resulting in effective grain size refinements and enhanced microhardness values.