하이브리드 태양광 LED 가로등 컨트롤러의 효율 개선

윤중현,김진사,Yun, Jung-Hyun,Kim, Jin-Sa 한국전기전자재료학회 2015 전기전자재료학회논문지 Vol.28 No.2

We develop the 60 W class hybrid solar LED street lamp controller. The controller is providing power via an inverter in the day with the least solar cell and battery and charging the battery for the ESS, acts as a power failure, the built-in battery. Rated output of the fabricated LED street lamp is 300 W or greater battery capacity 300 Wh, discharge time 10 hr, LED street lamp efficiency showed a very high level of light efficiency by about 127 lm/W. In addition, as a result of light distribution pattern according to the distance and the light intensity measurement will be able to ensure a very high quality, show the constant brightness in the distance from the road lights 6 m is about 35~40 lux in uniformity ratio. The proposed hybrid solar LED street lamp system showed a high energy capacity of approximately 1.5 to 152.7% power generation efficiency than typical conventional solar street lamp.

식물성장용 사각배광 LED 조명 개발 및 평가

윤중현,Yun, Jung-Hyun 한국전기전자재료학회 2014 전기전자재료학회논문지 Vol.27 No.2

In this paper, plant crops used in the region to grow crops for the LED lighting area of a rectangle to fit the light distribution to maximize the efficiency of a rectangular distribution was made of LED lights. After the fabrication of LED lamps, light distribution, and in the area of $1.2m{\times}3m$ was the analysis of Illuminance chart. As a result of examining the performance light distribution for total Emin/Eav is 56%, and the target area of the light distribution compared to normal lamps Emin/Eav is improved by about 17%. In addition, plants grown in the area to minimize the outgoing light distribution can be focused on the cultivation area, according to the distance of the plants and be able to have the best luminous efficacy is judged.

공기 조화를 위한 자외선 C 살균기의 개발 및 평가

윤중현,선기주,천민우,Yun, Jung-Hyun,Sun, Ki-Ju,Cheon, Min-Woo 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.12

Nowadays, with improvement of economical income and life qualities, life pattern changes have been brought such as increasing of avocational activities. Consequently, following those life trends, utilization of car is getting increased. Thus, the perceptions of car have been changed from the only means of transport in the past to a 2nd residental space. that is why the car's endo environmental factors are getting so important. Air conditioner regulating air ventilization in vehicle's indoor automatically sets the right temperature based on the differences of indoor and outdoor's temperature with development of advanced functions to provide better environmental qualities in vehicle. However, even those advanced techniques for functional development are got so diverse though, the essential technique for preventing the growth of bateria and mold inside of the air conditioner are not even severals. Especially, evaporator one of the vehicle air conditioning equipments generates cooled air by vaporizing refrigerant in liquid state with the water as the adduct for this reactions. It has structural difficulties for water vaporation then cause the growth of germs. That's why this reseach was focused on the way of eliminating germs in the vehicle air conditioner efficiently. Direct air sterilizer by using UVC(Ultraviolet C) is manufactured and that performances are evaluated.

태양광 가로등용 멀티스트링 파워 밸런싱 시스템의 개발 및 평가

윤중현,Yun, Jung-Hyun 한국전기전자재료학회 2012 전기전자재료학회논문지 Vol.25 No.12

In this paper, multi-string power balancing system for streetlight was developed. Accordingly, the components of the system was developed, unit converters, MPPT control unit, a bank of Li-ion battery and controls the charging and discharging. Loss by improving the efficiency of the system through the parallel operation of the unit converter output will be reduced. And by improving the efficiency of the system through the unit converter parallel operation, output losses will be reduced. Charging and discharging efficiency of the device used in a typical solar streetlight is calculated based on the maximum power input. Because of the variation of the input power has a weakness. In this paper, flexible to changes in the input, and a system was developed to minimize the cost per watt. Measure the performance of the unit module from the system, the result was more than 91%. And the charging capacity 12 V/105 Ah, module power 180 W, respectively. Should expect to be able to improve performance through continuous monitoring in the future.

전기방사법으로 제조된 PAN/PVdF 복합나노섬유의 특성연구

윤중현(Jung Hyun Yun),최동유(Dong You Choi) 大韓電子工學會 2009 電子工學會論文誌 IE (Industry electronics) Vol.46 No.3

본 논문에서는 PAN/PVdF의 중량비에 따라 방사용액을 제조한 후 고전압으로 전기방사법에 의해 복합나노섬유를 제조하였다. 제조된 복합나노섬유는 PVdF의 함량이 감소할수록 섬유경이 감소하는 경향을 나타냈다. PAN/PVdF 복합나노섬유의 친수성 정도를 확인하기 위하여 접촉각을 측정한 결과 친유성인 PVdF의 함량이 증가할수록 물과의 접촉각이 증가하는 것을 확인할 수 있었다. 필터측정용 샘플을 40℃의 온도, 85%의 습도에서 25시간 동안 방치한 후 성능을 평가한 결과 PAN/PVdF 복합나노섬유의 경우 99.95% 이상의 헤파(HEPA)급 및 99.999% 이상의 울파(ULPA)급 성능을 나타냄을 확인할 수 있었으며, 섬유경이 작을수록 필터 성능이 증가하는 것을 확인할 수 있었다. PAN/PVdF 복합나노섬유의 벌크 인장강도는 5-8㎫, 신도는 100-300% 범위였으며, PVdF의 함량이 증가할수록 강도와 신도가 동시에 증가하는 것을 알 수 있었다. PAN/PVdF 복합나노 섬유를 120℃에서 2시간 열처리한 시료의 인장강도는 3-8㎫정도였다. 인장강도의 경우는 열처리에 의해 거의 변화가 없었으며, 신도는 감소함을 알 수 있었다. In this paper, manufactured composite nanofiber by electrospinning that make spinning solvent according to weight of PAN/PVdF. PVdF content of composite nanofiber decreases, diameter of fiber decreased. Result that measure contact angle to confirm hydrophile property of PAN/PVdF composite nanofiber, PVdF content increases, could confirm that contact angle with water increases. After leave filter measurement sample for 25 hours in temperature of 40℃, humidity of 85%, result PAN/PVdF composite nanofiber that estimate efficiency could confirm that display performance of HEPA more than 99.95% and ULPA more than 99.999%. And fiber diameter is small, could confirm that filter performance increases. Tensile strength of bulk of PAN/PVdF composite nanofiber was 5-8㎫, expansion 100-300%. And strength and expansion could know that increase according as PVdF's content increases. Tensile strength was 3-8㎫ degree after annealing PAN/PVdF composite nanofiber during 2 hours in 120℃. Tensile strength was no change almost by annealing, and expansion could know that decrease.

Y-branch 광스위치 설계에 관한 연구

윤중현(Jung Hyun Yun),이재규(Jae Kyu Lee),김상덕(Sang Dug Kim),윤성도(Saung Do Yun),임성래(Seong Rae Lim),김종빈(Jong Bin Kim) 한국통신학회 1994 한국통신학회 학술대회논문집 Vol.1994 No.7

소형화 구조를 위한 koch curve 마이크로스트립 패치 안테나 설계

김선웅,김걸범,윤중현,최동유,Kim, Sun-Woong,Kim, Gul-Bum,Yun, Jung-Hyun,Choi, Dong-You 한국정보통신학회 2014 한국정보통신학회논문지 Vol.18 No.12

안테나에서의 소형화 기법은 안테나의 물리적인 모양을 변형하여 공진에 필요한 전기적인 길이를 주어진 공간에서 최대화하고 경우에 따라서 고차의 공진모드를 이용하는 방법이다. 가장 대표적인 설계방법으로는 헬리컬 안테나, 미앤더 안테나, 프랙탈 안테나 등이다. 본 논문에서 제안한 소형화 안테나는 프랙탈 개념의 koch curve 구조이다. 안테나는 ISM 대역의 2.45 GHz 주파수이며, 마이크로스트립 패치 안테나로 제작하였다. koch curve 마이크로스트립 패치 안테나는 유전율 4.7, 유전체 높이 1.6 mm, 손실 탄젠트 0.02의 FR4 epoxy 기판을 사용하였으며, 에칭공정으로 제작하였다. 제작된 안테나의 반사손실 결과는 2.45 GHz 대역에서 -23.17 dB, VSWR 결과는 1.1491, 임피던스 정합은 $46{\Omega}$이다. The antenna miniaturization technique involves the increment of the electrical length of the resonator the variation of the physical appearance of the antenna. The most typical method of size reduction is designing helical antenna, meander antenna, and fractal antenna. Size reduction using fractal antenna is proposed in this paper. Fractal koch curve has been etched in microstrip patch antenna to downsize the antenna at ISM (Industrial Scientific and Medical) frequency band of 2.45 GHz koch curve microstrip patch antenna ha FR4 epoxy substrate with dielectric constant 4.7, loss tangent equal to 0.02 and dielectric high of 1.6 mm. The designed antenna is fabricated using etching process. The fabricated antenna has return loss of 2.45 GHz, VSWR of 1.1492, and impedance is matched to $46{\Omega}$.

폴리머 테이퍼링 도파로 영역이 있는 저 손실 플라스틱 광섬유 커플러

김광택,민성환,윤중현,Kim, Kwang-Taek,Min, Seong-Hwan,Yun, Jung-Hyun 한국전자통신학회 2012 한국전자통신학회 논문지 Vol.7 No.4

본 논문에서는 폴리머 테이퍼링 도파로 영역을 포함하는 $1{\times}4$ 형태의 플라스틱 광섬유 커플러를 제안하고 구현하였다. 플라스틱 광섬유와 폴리머 사각 도파로의 접속면에서 광 누설 손실을 줄이기 위해 단면이 원형에서 구형으로 천천히 바뀐 플라스틱 광섬유를 도입하였다. 실리콘 고무로 만들어진 주형을 이용하여 소자를 제작하였다. 제작된 소자는 1.33 dB의 삽입손실과 2.2 dB의 평탄도를 보였다. In this paper, we proposed and demonstrated a low loss $1{\times}4$ type plastic optical fiber(POF) coupler incorporating a polymer tapering waveguide region. To avoid leakage loss at the interfaces between the POF and the polymer waveguide, we employed two POF transition regions, in which the cross section of the POF is adiabatically converted from a circular to a rectangular shape without change of its cross-section area. The device was fabricated based on a injection mold made of a silicon rubber. The fabricated POF coupler showed 1.33 dB of excess loss and 2.2 dB of flatness.

실리카 2층 Slab 도파로를 위한 고유방정식의 개선된 알고리즘

지유강,박종란,윤중현,박수봉,Ji yoo-kang,Park jong-ran,Yun jung-hyun,Park soo-bong 대한전자공학회 2006 電子工學會論文誌-SD (Semiconductor and devices) Vol.43 No.2

본 논문에서는 실리콘 상의 2층 실리카 도파로에서 새로운 고유치 방정식을 도출하여, 프리즘 커플러로 굴절률과 박막의 두께를 결정하는 방법을 나타내었다. 도출된 고유치 방정식의 알고리즘은 반복 파라메터가 4개의 변수에서 3개의 변수로 감소되어질 수 있으므로 Ref.[5]의 방정식의 해보다 보다 좋은 장점을 갖으며. 또한 본 논문에 얻어진 평균 에러는 약 $10^{-5}\~10^{-6}$ 이 하였다. In this paper, we derive a novel eigenvalue equation of double silica layers on silicon only for TE mode and present the method as an example how to use it to determine the refractive indices and thicknesses with prism coupler. Our method to solve eigenvalue equation have good merit rather than [5] in that the equation is real and iteration parameters can be reduced from four to three. The average magnitude of the errors is less than $10^{-5}\~10^{-6}$ approximately

광집적회로를 위한 PSG 박막 특성에 관한 연구

김상덕(Sang Dug-Kim),윤중현(Jung Hyun-Yun),이재규(Jae Kyu-Lee),김종빈(Jong Bin-Kim) 한국통신학회 1993 한국통신학회 학술대회논문집 Vol.12 No.1