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기반 기술 : 역률개선 및 고조파 저감을 위한 전자식 안정기 설계
이충식 ( Chung Sik Lee ),조문택 ( Moon Taek Cho ),나승권 ( Seung Kwon Na ) 한국항행학회 2014 韓國航行學會論文誌 Vol.18 No.5
제안된 회로는 교류 입력 전원부와 무손실 스너버 회로가 부가된 DC-DC 컨버터와 DC-AC 변환을 위한 인버터로 구성하였다. 변환된 등가회로를 이용하여 형광램프의 특성을 만족시킬 수 있는 최적의 회로상수를 결정해서 설계함으로써 기존의 인버터 직류측 에서 발생되는 맥동주파수에 의한 왜형파 발생을 제거하고 인버터의 입력전류를 불연속이 되도록 하므로써 맥동율과 스위칭 손실을 현저히 감소시켰다. 이러한 모든 결과를 증명하기 위하여 40 W 직관형 형광램프를 대상으로 실험하여 고조파의 발생을 측정한 결과 제안된 전자식 안정기의 우수성을 확인하였다. Proposed electronic ballast circuit for harmonic reduction includes adding lossless snubber circuit to DC DC converter. To get inverter for changing DC-AC, a lamp has been changed to equivalence resistance in the standard lamp voltage and current data, also inverter circuit has been interpreted by being changed to R, L, C equivalence circuit. Using converted equivalent circuit, the most suitable circuit constant which can satisfy the characteristics of fluorescent lamps has been decided on and finally designed. It could not only eliminate distortion waveform from pulsation frequency in inverter direct side current but also reduce considerably pulsation rate and switching loss by making input current of inverter discontinuous. The validity for the results of this study has been verified through the experiment to measure harmonic occurrence after applying a newly manufactured product of electronic ballast to 40 W line tube style fluorescent lamps.
이충식(Lee, Chung-Sik),박연민(Park, Yeon-Min),오동현(Oh, Dong-Hyun),이을영,성태경(Sung, Tae-Kyung),정채봉(Joung, Che-Bong),김병철(Kim, Byung-Chul) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.11
In this papers, we analyzed the performance evaluation for Multi face primatic Daylighting System. For this research, we conducted optical simulations using Lighting Tools Program for 12 models under various conditions. We selected 2 type models on the simulation results. And we compared model Ⅰ(azimuth tracking model)"s field test result with simulation result. Results show that system efficiency of the tracking system is higher 18.5% than the passive. This means that if the performance ratio of the passive model is assuming 100%, it is similar to simulation"s result 113%.
만성두통 환자에서 한방 치료 후 인영혈 부위의 뇌혈류에 대한 연구
이충식 ( Chung Sik Lee ),박보라 ( Bo Ra Park ),박인숙 ( In Suk Park ),김지훤 ( Ji Hwon Kim ),이상언 ( Sang Eon Lee ),임진영 ( Jin Young Lim ),류영수 ( Yeoung Su Lyu ),강형원 ( Hyung Won Kang ),김태헌 ( Tae Heon Kim ) 대한한방신경정신과학회 2009 동의신경정신과학회지 Vol.20 No.1
Objectives: This study was performed to change of blood flow in In-Young(ST9) after treatment on chronic daily headache patients. Methods: Monitoring of TCD was examined in 10`s chronic daily headache patients before and after treatment. Mean velocity flow, systolic velocity and pulsatility index were analyzed from TCD at In-Young(ST9). The patients was laid for 20 minutes before treatment and also for treatment. Results: The results showed a significant(p<0.05: Paired T-test) decrease in mean velocity flow and systolic velocity. but there were no significant differences in pulsatility index. Conclusions: These results suggest that there were significant change on blood flow in In-young of chronic daily headache patients.
BIPV 시스템의 차양 효과에 따른 피크 냉방부하 절감효과에 관한 연구
이충식(Lee Chung-Sik),이응직(Lee Eung-Jik),이철구(Lee Chul-Goo) 한국태양에너지학회 2008 한국태양에너지학회 논문집 Vol.28 No.5
As the number of buildings that use the transparent permeation materials as the outer wall is on the increase, the coming amount of the light rays is a lot, and thus the increase in the cooling load and the radiant heat of high temperature may cause the residents to discomfort. In order to reduce such influences, this paper analyzed the installation effects of the sunshade BIPV. The inner temperature of the room installed the sunshade BIPV or otherwise was measured, and compared and analyzed the effects of reducing the cooling load by the incoming light rays. The sample space of the third floor of S university installed the sunshade BIPV has two rooms on the same conditions, and for five sunny days selected in August, the researcher measured the air temperature and the temperature of the fittings with closing the windows to minimize the movement of air without operating the coolers. The maximum cooling load measured by the incoming light rays in the room where the sunshade BIPV was not installed was examined as 459.13kcal/h. It can be understood as the effect of reducing the cooling load according to the incoming rays of the room with sunshade BIPV. Even though the effect of cooling load reduction is not so great in a room, the total reduction in cooling room for the 32 rooms installed the sunshade BIPV was estimated to be 40442.27kcal/day, which will be able to bring the maximum reduction effect of 17.lkW in energy and reduce the investment cost owing to the reduction in cooling load when initially designing the building.
다중 파라볼릭 반사경 방식을 이용한 추적식 집광시스템 개발
이충식(Lee, Chung-Sik),김종민(Kim, Jong-Min),박연민(Park, Yeon-Min),성태경(Sung, Tae-Kyung),정채봉(Joung, Che-Bong),강승훈(Kang, Seung-Hoon),김병철(Kim, Byung-Chul) 한국태양에너지학회 2013 한국태양에너지학회 논문집 Vol.33 No.2
Daylighting system is an alternative lighting system using daylight collecting device, light transformer and light diffuser. In this paper, we developed a daylighting system in which the collecting device composed by dual parabolic reflectors, the silica optical fiber adapted to the light transformer and light diffuser made of the polyglass squaresheet. We have estimated the system efficiency and general color rendering index(Ra)of the developed system. The system efficiency measured to 23.8% and Ra was revealed as 95. Ra number of the developed system is bigger than the number(65) of the previous fresnel lens based sunlight collector.
합곡(合谷) 및 족삼리(足三里) 혈(穴) 자침이 인영혈(人迎穴)부위의 뇌혈류에 미치는 영향
이충식 ( Chung Sik Lee ),박보라 ( Bo Ra Park ),서종훈 ( Jong Hoon Seo ),강형원 ( Hyung Won Kang ),류영수 ( Yeoung Su Lyu ),김태헌 ( Tae Heon Kim ) 대한한방신경정신과학회 2007 동의신경정신과학회지 Vol.18 No.1
Objective : This study was performed to evaluate the effects of Hap-Kok(LI4) and Jok-Sam-Lee(ST36) acupuncture on blood flow in In-Young(ST9). Method : Monitoring of TCD was examined in each 25`s healthy men and wemen in 20s before and after acupucture on both(right and left) Hap-kok(LI4) and was done on both(right and left) Jok-Sam-Lee(ST36) by different group with same condition. Mean velocity and Pulsatility index analyzed from TCD at both In-Young(ST9). Both group was acupuctured for 15-20 minutes laying at bed. Results : The results showed a significant(p≤0.05: Paired T-test) decrease in mean velocity and increase in pulsatility index at both group. Conclusion : These results suggest that acupuncture could have a specific effect on blood flow called In-Young acupoint.