The CMM is the most widely used measuring device in the field. The three-dimensional measurement method is divided into a method of scanning the shape of a product and a touch method. In this study, the accuracy of the dimension and shape of each measurement point touch method was analyzed based on the measured value with the touch method CMM using the inner and outer diameter measurement specimens. Through the experimental results, it was possible to obtain the closest value to the true value at more than 30 measurement points.

In this study, measurement errors of the X and Y axes were verified by using an 80-100 mm gauge block, an NPL type angle measuring device, and a spelling on a contact-type 3D measuring device surface plate. In addition, the measurement specimen was repeatedly measured 10 times at 10° intervals from 0° to 40° to confirm the average value and standard deviation. After confirming the statistical test value (P) through ANOVA analysis of the statistical program, the correlation between angle change and error was confirmed.

The existing reliability evaluation models which have already developed by the corporations are so various because of using Maximum Likelihood Method. The existing models are very complicated owing to using system designing methods Therefore, it is very d

목적 및 방법: 콘택트렌즈 착용자를 대상으로 원주굴절이상 정도에 따라 등가구면 오차 발생도를 비교해 보기 위해, 자각적 굴절검사와 자동굴절력계를 이용한 타각적 굴절검사로 over-refraction을 수행하였다. 결과: 5종의 콘택트렌즈를 착용한 상태에서 자각적 및 타각적 굴절검사로 덧굴절검사를 실시한 결과, 일회용 소프트콘택트렌즈와 6개월용 소프트콘택트렌즈 그리고 실리콘하이드로젤 콘택트렌즈에서는 그룹 B(-0.25~-0.75D)에서 가장 큰 측정오차를 보였고, 미용칼라 콘택트렌즈는 그룹 D(up to -2.00D)에서 가장 큰 측정오차를 보였으며, RGP 콘택트렌즈는 그룹A(0D)에서 가장 큰 측정오차를 보였다. 그러나, 오차값은