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V2G-V2H 기능을 갖는 3.3kW급 전기자동차용 양방향 충전기
정세형(Se-Hyung Jung),홍석용(Seok-Yong Hong),박준성(Jun-Sung Park),최세완(Se-Wan Choi) 전력전자학회 2015 전력전자학회 논문지 Vol.20 No.1
This paper proposes a 3.3-kW bi-directional EV charger with V2G and V2H functions. The bi-directional EV charger consists of a DC-DC converter and a DC-AC inverter. The proposed EV charger is suitable for wide battery voltage control due to the two-stage configuration of the DC-DC converter. By employing a fixed-frequency series loaded resonant converter as the isolated DC-DC converter, zero-current-switching can be achieved regardless of battery voltage variation, load variation, and power flow. A 3.3-kW prototype of the proposed EV charger has been built and verified with experiments, and indicates a maximum efficiency of 94.39% and rated efficiency of 94.23%.
유수정체 안내후방렌즈삽입술 후 망막신경섬유층 두께 측정값의 변화
이태희,박정원,정세형,박상우,Tae Hee Lee,Jung Won Park,Se Hyung Jeong,Sang Woo Park 대한안과학회 2014 대한안과학회지 Vol.55 No.5
Purpose: In the present study we evaluated the changes of measured retinal nerve fiber layer (RNFL) thickness using optical coherence tomography (OCT) after phakic intraocular lens (implantable collamer lens, ICL) implantation and analyzed the factors correlated with the changes of measured RNFL thickness. Methods: Forty eyes of 40 patients (Group A: 20 patients using spectral domain OCT and Group B: 20 patients using time domain OCT) who underwent ICL implantation were included in this study. RNFL thickness was measured 1 week before surgery and 1 month postoperatively using OCT. The changes of measured RNFL thickness and the correlation between patients' data were analyzed. Results: The postoperative measured RNFL thickness of the average, inferior, temporal, and superior quadrants were increased compared to preoperative measured RNFL thickness in Group A. Group B had similar results in the average, inferior, and superior quadrants (<em>p</em> < 0.05). However, the postoperative changes of RNFL measurements were not correlated with the preoperative spherical equivalent, the degree of spherical equivalent change and diopters of implanted lens (<em>p</em> > 0.05). Conclusions: The measured RNFL thickness after ICL implantation may increase compared to the preoperative value. Caution should be taken when interpreting the RNFL thickness values measured by OCT in patients with myopia who undergo ICL implantation. J Korean Ophthalmol Soc 2014;55(5):702-710