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무색 인공수정체렌즈안과 광변색 인공수정체안에서의 수술 전후 스트레이라이트의 비교
김인혁,황형빈,신승주,정성근,In Hyuk Kim,MD,Hyung Bin Hwang,MD,Seung Joo Shin,MD,Sung Kun Chung,MD,PhD 대한안과학회 2014 대한안과학회지 Vol.55 No.2
Purpose: To compare visual acuity and intraocular straylight after implantation of clear and photochromic intraocular lenses (IOLs) in a mesopic lighting condition. Methods: Clear IOLs were implanted in 95 eyes of 72 patients (clear IOL group), and photochromic IOLs were implanted in 22 eyes of 16 patients (photochromic IOL group). Best-corrected visual acuity (BCVA) was measured indoors before surgery and 1 month after surgery. Straylight values were measured indoors before surgery and 1 and 2 months after surgery using the C-quant straylight meter (Oculus GmbH, Wetzlar, Germany). Results: There were no significant differences between the 2 groups in BCVA at 1 month postoperatively (p = 0.587). Mean straylight values of clear and photochromic IOL groups were 2.76 ± 1.89 log (s) and 2.88 ± 2.04 log (s) preoperatively, 1.39 ± 0.84 log (s) and 1.32 ± 0.26 log (s) at 1 month postoperatively, and 1.43 ± 0.92 log (s) and 1.45 ± 0.50 log (s) at 2 months postoperatively. There were no significant differences between the 2 groups in indoor straylight values (p = 0.778, 0.709, 0.929, before surgery, 1 and 2 months after surgery respectively). Repeated-measure analysis of straylight values also showed no significant difference between the 2 groups (p > 0.05). Conclusions: There were no significant differences in BCVA and straylight values between clear and photochromic IOL groups under a mesopic light condition. Therefore, photochromic IOL could be suitable choice for cataract patients who spend significant time under mesopic conditions. J Korean Ophthalmol Soc 2014;55(2):190-195
PI 관측기를 이용한 MDPS 시스템의 모델 기준 제어
김인혁(In Hyuk Kim),김규하(Kyu Ha Kim),정현희(Hyun Hee Jeong),서정훈(Jeong Hoon Seo) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
Various control performances such as assist torque generation, vibration suppression, providing road surface information, returnability, and damping are required in MDPS (Motor Driven Power Steering) system. For this reason, many kinds of control methods are being studied. This paper proposes a PI (Proportional Integral) observer based controller. The proposed controller consists of PI observer, MDPS reference model, and integral state feedback control including reaction force compensation. The PI observer is designed to estimate the state of the system, the driver’s torque, and the rack reaction force, and then, the reference model is designed to have the desired steering feel. The estimated driver torque is used for the reference model to generate the position command. The motor torque to actuate the MDPS system consists of rack reaction force compensation and position control. This paper shows the simulation results to describe the performance of the proposed control method.