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손성완,서정원,신승주,정성근,Sung Wan Son,Jung Won Seo,Seong Joo Shin,Sung Kun Chung 대한안과학회 2010 대한안과학회지 Vol.51 No.12
Purpose: The goal of the present study was to compare the stability of the 3-piece (TecnisⓇ ZA9003) and single-piece (AcrySofⓇ IQ) aspheric intraocular lenses (IOL) by testing decentration, tilt, anterior chamber depth, and refraction. Methods: The subjects of this study consisted of 101 eyes who had undergone cataract surgeries with a 3-piece aspheric IOL (54 eyes) and with a single-piece aspheric IOL (47 eyes). The decentration, tilt, anterior chamber depth, and refraction were measured on postoperative day 1, 1 month, and 2 months, using an anterior eye segment analysis system (EAS-1000, Nidek, Japan). Results: There was a statistically significant difference in the decentration on the postoperative day 1 (p = 0.04). However, there was no statistically significant difference on postoperative 1 month (p = 0.15) and 2 months (p = 0.13). There was no statistically significant difference in the tilt on postoperative day 1, 1 month, and 2 months. There was no statistically significant difference in the anterior chamber depth on postoperative day 1, 1 month, and 2 months. There was a statistically significant difference in the refraction on postoperative day 1 (p = 0.03). However, there was no statistically significant difference on postoperative 1 month (p = 0.07) and 2 months (p = 0.07). Conclusions: There was no statistically significant difference in the decentration, anterior chamber depth, and refraction between the 3-piece and single-piece aspheric IOL. Therefore, there is no difference between the 3-piece and single-piece aspheric IOL in the capsular bag stability until 2 months postoperatively. J Korean Ophthalmol Soc 2010;51(12):1584-1589
손성완,장성호,백재호,전종균,권영철,Son, Sung-Wan,Jang, Sung-Ho,Baek, Jae-Ho,Chun, Chong-Keun,Kwon, Young-Chul 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.1
공기스프링을 감쇠기로 사용하는 방진대는 넓은 주파수대역에서 우수한 진동 절연성능을 가짐으로 널리 사용되어 왔다. 하지만 공기스프링은 구조적으로 저강성, 저감쇠의 특성을 가지고 있으므로 외란에 의해 쉽게 가진되어 안정성이 떨어지는 문제가 있다. 이에 공기스프링과 같은 수동소자만을 이용한 수동제어 형식의 보완을 위해 능동 및 반능동 방식의 감쇠기가 제안되고 연구되고 있다. 따라서 본 연구에서는 이러한 수동형 제진대의 능동 및 반능동제어를 위한 동역학적 해석에 관하여 연구하였다. 제진대의 제어시스템 구현을 위하여 6 자유도 제진대의 물리적인 특성에 기초한 동역학적 모델을 정립하고 해석 및 실험을 통해 동역학 모델의 적용가능성을 검증하였다. The anti-vibration tables that use air suspensions as dampers have been widely used due to their high anti-vibration performance in wide frequency band. However, they face a problem of easily accelerating the vibration when triggered by external force because their air suspensions have low rigidity and dampness. In response, there has been a study on active/semi-active dampers that use only the passive components like air suspensions to complement the passive-control format. Thus, we have dynamically analyzed the active/semi-active control of such passive anti-vibration tables. To demonstrate the anti-vibration table's control system, we have also constructed a kinetic model based on the physical characteristics of an anti-vibration table with 6 degrees of freedom and verified its applicability through analysis and experiments.
팁의 횡운동에 의한 2차원 및 3차원 물 메니스커스 형상변화에 관한 연구
손성완(Sung Wan Son),하만영(Man Yeong Ha) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Two and three dimensional immiscible water meniscus deformation phenomena on a moving tip in a channel has been investigated by using lattice Boltzmann method involving two-phase model. We studied the behavior of a water meniscus between the tip and a solid surface. The contact angles of the tip and a solid surface considered are in the range from 10° to 170°, the velocity of the tip used in the study are 0.01, 0.001, and 0.0001, and flat and rounded tips are considered. The behavior of water confined between the tip and a solid surface depends on the contact angles of the tip and a solid surface, and the velocity of the tip. When the tip is moving, we can observe the various behaviors of shear deformation of a water meniscus. As time goes on, the behavior of the water meniscus can be classified into three different patterns which are separated from the tip or adhered to the tip or sticked to a solid surface according to the contact angles and the tip velocities.