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철도차량용 무선전력전송시스템의 지상 권선 방식에 따른 특성 비교 연구
정신명(Shin-Myung Jung),박찬배(Chan-Bae Park),이병송(Byung-Song Lee),김재희(Jae-Hee Kim),이승환(Seung-Hwan Lee),이준호(Jun-Ho Lee),이수길(Su-Gil Lee),백제훈(Jeihoon Baek),이경표(Kyung-Pyo Yi),이원준(Won-Jun Lee) 한국철도학회 2014 한국철도학회 학술발표대회논문집 Vol.2014 No.10
최근 무선전력전송기술이 휴대폰, 전동칫솔 등의 생활 가전제품에의 적용을 넘어 전기자동차, 전기버스와 같은 교통수단, 그리고 더 큰 용량을 필요로 하는 철도차량에까지 그 적용이 확대되고 있다. 본 논문에서는 그 중에서 철도차량에 적합한 무선전력전송 시스템의 지상 권선 방식을 소개하고 그 특성을 비교분석 하였다. 구조가 간단하고 경제성이 뛰어난 단상 권선 방식과 단상과 같은 전류에서 더 큰 전력을 보낼 수 있는 삼상 권선 방식을 소개하고, 2차 측에서의 출력전압, 레일에 유기되는 유기기전력 특성, 경제성등의 분석도 수행하였다. 시뮬레이션을 통해 각 방식의 특성을 살펴보고, 그 결과를 통해 픽업 구조의 최적화 설계에 활용하여 철도차량에 보다 적합한 무선전력전송시스템 모델을 도출할 수 있을 것으로 기대된다. Recently, wireless power transfer (WPT) technology has been applied to the home appliances such as mobile phones, electric toothbrush, LED TVs, and lightings, and even electric vehicles (EV) and railway transit. This paper presents the various ground winding methods of WPT for railway transit, and theoretical analysis of those methods. The single-phase ground winding method which has a simple structure and lowcost, and three-phase ground winding method which has high power density are introduced and the comparative analysis of the secondary pick-up induced voltages, rail induced voltages, and economic feasibility are conducted to draw the optimal WPT models for railway transit.
Development of 1-MW Inductive Power Transfer System for a High-Speed Train
Jae Hee Kim,Byung-Song Lee,Jun-Ho Lee,Seung-Hwan Lee,Chan-Bae Park,Shin-Myung Jung,Soo-Gil Lee,Kyung-Pyo Yi,Jeihoon Baek Institute of Electrical and Electronics Engineers 2015 IEEE transactions on industrial electronics Vol. No.
<P>Design and fabrication of a 1-MW inductive power transfer (IPT) system that supplies power to the vehicle in real time without any battery charge is proposed for a high-speed train. The IPT system consists of a 1-MW resonant inverter, a 128-m transmitter, four pickups, including rectifiers, and a wireless feedback network to maintain a constant output voltage of the pickups. The operating frequency of the system is 60 kHz to achieve efficient power transfer with a large air gap. The measured efficiency of the IPT system at the 818-kW output power of the pickups for the 5-cm air gap is 82.7%. The electromagnetic field and the induced voltage at the rail are also measured for safety evaluation. The fabricated IPT system was adapted to the high-speed train, and the train successfully accelerates to a speed of 10 km/h according to startup procedures.</P>
이진복(Lee, Jinbok),김경택(Kim, Kyeongtack),안치형(Ahn, Chi-Hyung),백제훈(Back, Jeihoon),신현오(Shin, Hyun-Oh) 한국방재학회 2019 한국방재학회논문집 Vol.19 No.7
본 연구에서는 동절기 콘크리트의 동해를 방지하고, 강도발현 성능을 확보하기 위해 전자기 유도에 의한 비접촉식 가열방식인 유도가열을 활용한 콘크리트 발열양생 기법을 개발하였다. 거푸집 종류 및 두께, 온도이력곡선의 형태, 강섬유 혼입률에 따른 발열양생 후 압축강도 특성을 평가하였다. 실험결과 0 ˚C 저온양생 콘크리트의 15시간 압축강도는 1 MPa 미만으로 강도발현이 전혀 진행되지 않아 동절기 발열양생의 필요성을 확인하였다. 유도가열에 의한 발열양생의 경우 고온가열양생과 비슷한 수준의 강도 발현율을 보였으며, 상온양생 대비 약 122-188%의 강도 발현율을 보이는 것으로 나타났다. A heat curing method was developed for concrete by using induction heating, which is a non-contact technique that operates on the principle of electromagnetic induction. The aim was to protect the concrete from freezing and achieve appropriate rate of strength gain in cold weather. The effects of the types and thicknesses of metallic forms, temperature variation curves, and addition of steel fibers on the compressive strength of concrete were evaluated. Test results indicated that no strength gain occurred when the concrete was kept in a low-temperature chamber at 0 °C. The concrete specimens that were cured using induction heating exhibited a strength gain ratio (122%-188% of the concrete cured at ambient temperature) that was comparable to that of the concrete specimens cured in a high-temperature chamber.
이제훈,곽애영,정우석,하병진,Jeihoon Lee,Ae Young Kwak,Woo Suk Chung,Byoung Jin Ha 대한안과학회 2011 대한안과학회지 Vol.52 No.12
Purpose: We present a new simple technique to remove subconjunctival cyst under the slit lamp microscope. Case summary: A cotton swab was used to verify whether or not the cyst was freely movable under the conjunctiva. After topical anesthesia, we incised the conjunctiva near the cyst using a 30-gauge needle and extracted the cyst through the wound using forceps under the slit lamp microscope. Four cases of subconjunctival cyst were successfully removed with our new technique. During the average five month (2-10 month) follow-up period, there was no recurrence or procedure- related complications. Conclusions: Some subconjunctival cysts such as an epithelial inclusion cyst which is freely movable without attachment to surrounding tissues can be easily removed with a 30-gauge needle and forceps under the slit lamp microscope. This could be considered as the primary procedure instead of simple aspiration. J Korean Ophthalmol Soc 2011;52(12):1531-1536
Ji, Yong Woo,Lee, Jeihoon,Lee, Hun,Seo, Kyoung Yul,Kim, Eung Kweon,Kim, Tae-im Wolters Kluwer Health, Inc. All rights reserved. 2017 Cornea Vol.36 No.2
<P>Conclusions: Automated noninvasive measurements using an advanced corneal topographer and LLT measured with an ocular surface interferometer can be alternatives to conventional methods to evaluate tear conditions on the ocular surface; the former device can provide information about conformational MG changes in NSDES with MGD.</P>
김태임,김응권,David Sung Yong Kang,이훈,최진영,Jeihoon Lee 연세대학교의과대학 2016 Yonsei medical journal Vol.57 No.6
Purpose: To compare the effectiveness of toric foldable iris-fixated phakic intraocular lens (pIOL) implantation and non-toric foldableiris-fixated pIOL implantation with limbal relaxing incisions (LRIs) for correcting moderate-to-high astigmatism in myopic eyes. Materials and Methods: The medical records of 146 patients (195 eyes) with myopic astigmatism who underwent toric foldable iris-fixated pIOL implantation (toric group; 94 eyes) or non-toric foldable iris-fixated pIOL implantation with concurrent LRIs (LRI group; 101 eyes) were retrospectively reviewed. For subgroup analysis, the two groups were subdivided according to preoperative astigmatic severity [moderate, 2.00 to <3.00 diopters (D); high, 3.00–4.00 D]. Visual and astigmatic outcomes were compared 6 months postoperatively. Results: The uncorrected distance visual acuity was at least 20/25 in 100% and 98% of the toric and LRI group eyes, respectively. The toric group had lower mean residual cylindrical error (-0.67±0.39 D vs. -1.14±0.56 D; p<0.001) and greater mean cylindrical error change (2.17±0.56 D vs. 1.63±0.72 D; p<0.001) than the LRI group, regardless of the preoperative astigmatic severity. The mean correction index (1.10±0.16 vs. 0.72±0.24; p<0.001) and success index (0.24±0.14 vs. 0.42±0.21; p<0.001) also differed significantly between the groups. Conclusion: Both surgical techniques considerably reduced astigmatism and had comparable visual outcomes. However, toric foldableiris-fixated pIOL implantation was more reliable for correcting moderate-to-high astigmatism in myopic eyes.