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미세표면분석 기법을 이용한 미용 콘택트렌즈와 일반 콘택트렌즈의 표면거칠기와 세균부착성 비교
지용우,홍순호,정동룡,김응권,이형근,Yong Woo Ji,Soon Ho Hong,Dong Yong Chung,Eung Kweon Kim,Hyung Keun Lee 대한안과학회 2014 대한안과학회지 Vol.55 No.5
Purpose: To determine the surface roughness of cosmetic and conventional contact lenses (CLs) and their susceptibility to bacterial adhesion. Methods: Concave surface roughness of cosmetic and conventional hydrogel (Etafilcon A) CLs was measured by atomic force microscopy (AFM) and scanning electron microscopy (SEM). In particular, the surface of the color tinted area of cosmetic CLs was measured. CLs were immersed into a bacterial solution of Pseudomonas aeruginosa for 1, 12, or 24 hours and culture of P. aeruginosa that had adhered to the CLs was performed. Results: Concave surface roughness of cosmetic CLs significantly increased compared with conventional CLs by AFM (<em>p</em> < 0.05). Bacterial colony formation of <em>P. aeruginosa</em> adhering to cosmetic CLs within one hour significantly increased compared with conventional CLs (<em>p</em> = 0.047). Adhesions of <em>P. aeruginosa</em> to CLs within one hour was found to correlate significantly with the surface roughness of CL (r > 0.9, <em>p</em> < 0.05). By SEM, <em>P. aeruginosa</em> had adhered to the color-tinted area more than to the non-color-tinted area of cosmetic CLs. Conclusions: Surface of cosmetic CLs was significantly rougher and initial adhesion of bacteria was higher to cosmetic CLs than to conventional CLs. In particular, an increased number of bacteria was found to be adhered to the color-tinted area of cosmetic CLs. Initial bacterial adhesion is important because it is the first stage of bacterial attachment process to any surface. After then, the adherent bacteria can progress to form a biofilm. Increased surface roughness of CLs contributes to opportunities for the CL to come into contact with bacteria, and thus, initial bacterial adhesion increases. In this study, it is clear that cosmetic CLs are more vulnerable to bacterial adhesion. To avoid serious complications, such as bacterial keratitis, the manufacturing process for smoothing and treating the surface in order to inhibit bacterial adhesion should be developed in the future. J Korean Ophthalmol Soc 2014;55(5):646-655
지용우(Yongwoo Jee),백건(Keon Baek),김진호(Jinho Kim) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.6
신재생 에너지 보급의 증가로 신재생 에너지의 간헐성, 변동성, 분산화의 특성에 따라 기존 전력 산업에서 발견되지 않은 새로운 문제가 발생하고 있다. 이에 대응하여 국내 계통의 예비율은 지속적으로 증가하고 있으며 실효성을 위해 수요형 virtual power plant(VPP)와 같은 대안이 요구된다. 수요형 VPP 자원을 활용하기 위해 선행적으로 수요자원에 대한 분석과 연구가 필요하며, 본 논문에서는 VPP에 대형 수요자원으로서 활용할 수 있는 산업용 수요자원의 부하패턴을 파악하고 분석하였다.