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안영주(Young ju An),김효진(Hyo jin Kim),주천기(Choun Ki Joo) 대한안과학회 2016 대한안과학회지 Vol.57 No.7
목적: Galilei G6와 Pentacam HR로 측정한 각막굴절력과 전방깊이, 중심각막두께의 측정치를 비교하고, 기기 간 일치도를 분석하고자 하였다. 대상과 방법: 백내장 수술을 목적으로 방문한 환자 40명(40안)을 대상으로 두 기기를 이용하여 측정한 전면과 후면의 각막굴절력, 전방깊이, 그리고 중심각막두께를 비교하였다. 결과: Galilei G6 (4 mm), Pentacam HR (3 mm), Pentacam HR (4 mm)로 측정한 전면 각막굴절력은 각각 44.35 ± 1.38D, 44.09 ± 1.32D, 44.12 ± 1.35D였고, 후면 각막굴절력은 각각 6.39 ± 0.23D, 6.45 ± 0.23D, 6.45 ± 0.22D였다. Galilei G6 (4 mm)와 Pentacam HR (3 mm), Galilei G6 (4 mm)와 Pentacam HR (4 mm) 사이에서 전면과 후면 각막굴절력 모두 유의한 차이를 보였다. Galilei G6와 Pentacam HR로 측정한 전방깊이는 각각 3.26 ± 0.42 mm, 3.17 ± 0.42 mm, 중심각막두께는 각각 556.65 ± 30.12 μm, 553.78 ± 29.42 μm였고, 측정치 간에 유의한 차이를 보였으며, 측정값의 95% 일치도 한계는 각각 -0.14~0.32 mm, -12.54~18.29 μm였다. 결론: Galilei G6와 Pentacam HR로 측정한 전면과 후면의 각막굴절력, 전방깊이, 그리고 중심각막두께는 측정치에서 유의한 차이를 보이고 일치도가 낮아 임상에서 대치하여 사용할 수 없을 것으로 생각한다. 〈대한안과학회지 2016;57(7):1056-1062〉 Purpose: To assess the degree of agreement of two rotating Scheimpflug cameras, Galilei G6 and Pentacam HR, in measuring corneal refractive power (K), anterior chamber depth (ACD), and central corneal thickness (CCT). Methods: Measurement agreement was assessed in 40 eyes of 40 outpatients at our hospital. Measurements of anterior and posterior corneal refractive power (K), ACD, and CCT were compared between the Galilei G6 and Pentacam HR. Results: For Galilei G6 (4 mm), Pentacam HR (3 mm) and Pentacam HR (4 mm), the anterior corneal refractive powers (K) were 44.35 ± 1.38 D, 44.09 ± 1.32 D, and 44.12 ± 1.35 D, respectively, and the posterior corneal refractive powers (K) were 6.39 ± 0.23 D, 6.45 ± 0.23 D, 6.45 ±0.22 D. The differences in the results were statistically significant. The average ACD measurements using Galilei G6 and Pentacam HR were 3.26 ± 0.42 mm and 3.17 ± 0.42 mm, respectively, and the average CCT measurements were 556.65 ± 30.12 μm and 553.78 ± 29.42 μm. The differences in the measurements were statistically significant. In addition, ACD 95% limits of agreement (LoA) between Galilei G6 and Pentacam HR were in the range of -0.14~0.32 mm, and CCT 95% LoA were in the range of -12.54~18.29 μm. Conclusions: There were significant differences in measurements of anterior and posterior corneal refractive power (K), ACD, and CCT between the two cameras. Agreement analysis suggests that Galilei G6 and Pentacam HR should not be used interchangeably. J Korean Ophthalmol Soc 2016;57(7):1056-1062
이주현(Ju-Hyun Lee),안영주(Young-Joo An),안진우(Jin-Woo Ahn) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
This paper is to research about design and drive system of a switched reluctance motor for a pallet truck application. SRM is suitable for a pulse type source and is researched for home and industrial applications owing to the advance of power electronics technology. An SRM for a pallet truck drive is developed and tested. The drive system has to operate with low voltage and high current. The small size, robustness and high efficiency make it possible to replace with DC motor which is used in a pallet truck conventionally. Test results show that pallet truck with SRM has better drive characteristics than that of the DC motor.
Tread Mill용 BLDCM의 구동 특성 향상을 위한 제어시스템
이주현(Ju-Hyun Lee),안영주(Young-Joo An),안진우(Jin-Woo Ahn) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
BLDCM(Brushless D.C. Motor) is widely used for industrial application because of high efficiency and high power density. Especially, in servo system and home appliance, BLDCM is very useful due to high control performance and low acoustic noise. In this paper, 2.5HP rated BLDCM and its controller is developed for tread mill application. The prototype BLDCM has 4 poles rotor and 24 slots stator. Ferrite magnet was used as a rotor magnet because of the cost and temperature characteristic. For the stable operation of tread mill, current and temperature can be detected and treated by DSP. Thedesigned BLDCM and its controller is verified by the experimental results.