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- 저자 : 오정한(Chunghan Oh) (검색결과 2 건)
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김민정(Minjung Kim),오정한(Chunghan Oh),박신혜(Shinhae Park),주천기(Choun‐,Ki Joo) 대한검안학회 2006 Annals of optometry and contact lens Vol.5 No.1
Purpose: To investigate the prevalence of accommodative insufficiency and convergence insufficiency and to evaluate the visual fatigue causes accommodative insufficiency and convergence insufficiency. Methods: 80 subjects (mean age: 14.46±1.70 yrs) performed Push‐up method for amplitude of accommodation and near point convergence. We evaluate the subjective visual fatigue and Critical flicker fusion frequency using Visual Fatigue Instrument (Visual Fatigue Instrument 501a, WellTech, Paju, Kyongkido, Korea) causes accommodative insufficiency and convergence insufficiency. Results: Mean amplitude of accommodation was 15.93±6.73 D and 80% within normal range and mean near point convergence was 5.48±2.56 cm and 92.5% within normal range. Amplitude of accommodation and subjective visual fatigue showed statistical significant correlation (p=0.000). Critical flicker fusion frequency and subjective visual fatigue showed statistical significant correlation (p=0.000). However there was no statistical significant correlation in near point convergence and subjective visual fatigue (p>0.000). Conclusions: Accommodative insufficiency was more prevalent than convergence insufficiency and amplitude of accommodation and subjective visual fatigue showed statistical significant correlation (p=0.000). It is important to perform amplitude of accommodation for decrease visual fatigue in student.
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ZK 웜과 인볼류트 헬리컬기어로 결합된 CVVL용 웜기어 설계
손종현(Jonghyeon Sohn),박노길(Nogill Park),오정한(Chunghan Oh) 한국자동차공학회 2014 한국 자동차공학회논문집 Vol.22 No.1
The worm gear is used in the motor drive system of automotive CVVL because of its compactness and self-locking ability. A ZK worm and an involute helical gear can be meshed in order to reduce production cost. However, the gearing is not suitable for the reliability and the NVH problem. To improve the dynamic performances, an optimal design process is considered. The transmission error is calculated theoretically and minimized with the several gear design parameters. An inequality condition such as the teeth interference elimination is added.
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