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STANDARDS BUILDER - KTC 심윤수 원장 - 글로벌 종합시험인증기관으로 힘찬 도약
윤정호,Yun, Jeong-Ho 기술표준원 2011 기술표준 Vol.110 No.-
한국기계전기전자시험연구원(KTC)은 지난해 7월 한국전기전자시험연구원과 한국기기유화시험연구원이 통합되어 출범한 종합시험인증기관이다. 전기 전자, 계량 계측, 에너지 등 산업 전 분야에 걸친 시험인증 인프라 구축을 통해 차세대 주성장 동력산업을 육성, 자원하며 최근에는 신기술 제품 인증정보 보급과 국제인증 네트워크 구축 등에 박차를 가하는 한편 친환경 녹색기술 분야와 스마트 그리드, NFC(Near Field Communication) 등 새로운 사업영역에도 적극 도전하고 있다.
Visual fatigue in Watching 3 Dimension Television
윤정호,이익한,김대현,김재도 한국안광학회 2012 한국안광학회지 Vol.17 No.1
Purpose: This study was to evaluate visual fatigue with passing of watching 3D TV in short term and with experience of watching 3DTV in long term. Methods: 98 adult subjects aged 33.5±5.5 years (22 to 51 years; 12females and 86 males) agreed to participate in this study. Subjects were asked to watch 52 inch LED 2D and 3D television (Shutter glasses method) at 2.7 meters for 65minutes with wearing their habitual glasses or contact lenses. For evaluating visual fatigue, subjects were verbally responded to 11 questions : eye straining, eye paining, dry eye, sore eye, watery eye, photophobia, blur vision, diplopia, eye fatigue, headache, and dizziness with scale 0 to 3 at each measurement while watching 3D and 2D TV. Results: The mean scores of visual fatigue were 2.08±2.14, 3.19±3.02, 3.40±3.37, 3.53±3.07 for after 5 minutes, 25 minutes, 45 minutes, and 65 minutes respectively for 3D TV, and 0.40±1.03, 0.22±0.70, 0.22±0.58, and 0.17±0.52 after 25, 45, and 65 minutes respectively for 2D TV. Visual fatigue for watching 3D TV was significantly higher than for watching 2D TV at all measurements sessions (paired t-test, p < 0.001). The visual fatigue significantly increased during watching 3D TV for 65minutes (p < 0.001, RM-ANOVA). The visual fatigue during watching 3D TV was significantly increased until 25minutes (paired t-test, p < 0.001), stable after that. For correlation between visual fatigue and 3D watching experience, the more 3D watching experiences were significantly the less visual fatigues in photophobia, blur vision, diplopic and dizzy symptoms (ANOVA, all F(1, 96) = 4.500, all p < 0.05), but there was not significantly different in the other symptoms (ANOVA, F (1, 96) = 2.123, p = 0.148). Conclusions: Visual fatigue for watching 3D TV was higher than for watching 2D TV, increase by 25 minutes. It was different by symptoms for correlation between visual fatigue and 3D watching experience.
윤정호,안상훈 대한기계학회 1993 大韓機械學會誌 Vol.33 No.2
전자산업이 고도화되어감에 따라 전자기술은 소재 . 기계분야와 복합된 기술의 발전이 가속화 되어 가고 있다. 특히 이 글에서는 응력해석 CAE 기술이 전자부품산업에 적용되는 사례를 소 개하고자 한다. 그 중 하나는 하드디스크의 정밀부품 중의 하나인 스핀들 모터용 Hub의 절삭 가공시 고려하여야 하는 탄성 변형량을 해석하고 이를 적용하는 사례이고 또 하나는 Audio Deck의 Capatan Shaft를 지지하는 플리스틱 Base가 신뢰성 시험도중 또는 고온 부하시 발생하는 크리프현상을 해석하여 적용하는 사례이다. 이 글에서 소개하는 두 가지 사례는 전자부품산업에 응력해석 CAE를 적용할 수 있는 예들 중 빙산의 일각에 불과할 뿐이고, 이와 유사한 전자부품에 응력해석 CAE를 적용할 수 있다.
Validating a New Approach to Quantify Posterior Corneal Curvature in Vivo
윤정호,Kodikullam Avudainayagam,Chitralekha Avudainayagam,Helen A Swarbrick 한국안광학회 2012 한국안광학회지 Vol.17 No.2
Purpose: Validating a new research method to determine posterior corneal curvature and asphericity(Q) in vivo,based on measurements of anterior corneal topography and corneal thickness. Methods: Anterior corneal topographic data, derived from the Medmont E300 corneal topographer, and total corneal thickness data measured along the horizontal corneal meridian using the Holden-Payor optical pachometer, were used to calculate the anterior and posterior corneal apical radii of curvature and Q. To calculate accurate total corneal thickness the local radius of anterior corneal curvature, and an exact solution for the relationship between real and apparent thickness were taken into consideration. This method differs from previous approach.^[18,27-30] An elliptical curve for anterior and posterior cornea were calculated by using best fit algorism of the anterior corneal topographic data and derived coordinates of the posterior cornea respectively. For validation of the calculations of the posterior corneal topography, ten polymethyl methacrylate (PMMA) lenses and right eyes of five adult subjects were examined. Results: The mean absolute accuracy (±standard deviation(SD)) of calculated posterior apical radius and Q of ten PMMA lenses was 0.053±0.044 mm (95% confidence interval (CI) −0.033 to 0.139), and 0.10±0.10 (95%CI −0.10 to 0.31) respectively. The mean absolute repeatability coefficient (±SD) of the calculated posterior apical radius and Q of five human eyes was 0.07±0.06 mm (95% CI −0.05 to 0.19) and 0.09±0.07 (95% CI −0.05 to 0.23), respectively. Conclusions: The result shows that acceptable accuracy in calculations of posterior apical radius and Q was achieved. This new method shows promise for application to the living human cornea.