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천공구분에 따른 서울지역 일사의 발광효율 측정 및 예측모델과의 비교 연구
윤갑천,윤경,김강수 한국태양에너지학회 2011 한국태양에너지학회 논문집 Vol.31 No.6
For accurate daylight simulation, accurate exterior illuminance is necessary. But, Korea Meteorological Agency provides only the solar irradiance data. Thus, there is a need for the research on luminous efficacy. In this study, global horizontal irradiance, diffuse horizontal irradiance, global horizontal illuminance, and diffuse horizontal illuminance were measured to calculate the luminous efficacy in SEOUL. And, we evaluated the applicability of the Perez"s model by comparing the measured data and calculated data. As a result, measured global luminous efficacy is 126(110~129)lm/W and diffuse luminous efficacy is 127(115~133)lm/W in Seoul. Perez"s model was relatively accurate with 5% difference in the diffuse luminous efficacy. But, it can be predicted about 15% lower in the global luminous efficacy.
일사의 발광효율을 이용한 수직면 주광조도 예측에 관한 연구
윤갑천(Yoon Kap-Chun),김강수(Kim Kang-Soo) 한국태양에너지학회 2014 한국태양에너지학회 논문집 Vol.34 No.1
Exterior vertical illuminance is an important factor for lighting control. But, there are not many researches about the exterior illuminance on a vertical surface. In this study, we predicted the exterior illuminance on a vertical surface using vertical luminous efficacy. First, we calculated the vertical luminous efficacy according to the sky clearness category. And we performed the statistical analysis of the measured and the calculated illuminance with luminous efficacy. The MBE and RMSE of the predicted exterior illuminance were-1.2% and 15.5%, respectively. Second, the annual illuminance on a vertical surface calculated with the luminous efficacy and the short-term measured solar irradiance was suggested in this study.
A New Structure and Driving Scheme of PDP for High Luminous Efficacy
Yi, Jeong-Doo,Kim, Joon-Yeon,Chae, Su-Yong,Kim, Tae-Woo,Cho, Sung-Chun,Chun, Byoung-Min,Kim, Jeong-Nam,Cho, Yoon-Hyoung The Korean Infomation Display Society 2004 Journal of information display Vol.5 No.2
We have developed a new PDP cell structure called MARI(Multi Anode for Reduction of Ionic effect) and new driving scheme achieving a high luminous efficacy. The MARI PDP has middle electrode inserted between X and Y main electrodes. In the MARI PDP, reset and scan voltage is applied to middle electrode and sustain voltage is applied to X and Y electrode. Using a long gap sustain discharge we accomplished a high luminous efficacy. And we developed 42"full panel adopting MARI structure and new driving scheme and attained luminous efficacy of 2.35 lm/W.
Long 전극갭을 가지는 AC PDP의 전기광학적특성에 미치는 돌기전극의 영향
許禎恩(Jeong-Eun Heo),玉政于(Jung-Woo Ok),李敦揆(Don-Kyu Lee),李海準(Hae-June Lee),李?駿(Ho-Jun Lee),朴正后(Chung-Hoo Park) 대한전기학회 2008 전기학회논문지 Vol.57 No.8
In the current PDP technology, one of the most important issues in AC PDP is improvement of luminance and luminous efficacy. To improve luminance and luminous efficacy, new cell structure of PDP containing long discharge path is necessary. However, it causes an increment of firing voltage. In order to decrease firing voltage of AC PDP having long discharge gap, the protrusion electrode is proposed. To drop the firing voltage, the protrusion electrode is inserted into the forward area of the main discharge gap. This paper presents measurements of detailed optical and electrical characteristics of AC PDP with protrusion electrodes. The experimental results show that the proposed structure with gap 80㎛ has lower firing voltage to 27V than that of the conventional long gap structure. Moreover, the ICCD(Intensified Charge Coupled Device) images of the proposed structure show quick discharge generation by 0.07usec and longer continuation by 0.05usec than that of the conventional long gap structure. Therefore, the proposed protrusion electrodes have higher luminance by 12.5% than that of the conventional structure, as having no decrement of Luminous efficacy.
AC PDP의 휘도 및 효율 향상을 위한 Long Discharge Gap 전극구조 연구
董殷?(Eun-Joo Dong),玉政于(Jung-Woo Ok),李敦揆(Don-Kyu Lee),李海準(Hae-June Lee),李?駿(Ho-Joon Lee),朴正后(Chung-Hoo Park) 대한전기학회 2008 전기학회논문지 Vol.57 No.5
One of the most important issues in AC PDP is luminance and luminous efficacy. To improve the luminance and luminous efficacy, new sustain electrode structure which contains long discharge gap is necessary. However, it causes a rise of firing voltage. In this experiment, a new structure is proposed in order to solve this problem. To drop the firing voltage, the hump shaped electrode is inserted into the forward area of the main discharge gap. The experimental results show that proposed structures with 160um discharge gap have high firing voltage by 38V, high luminance by 30% and high luminous efficacy by 15% compared with conventional type having 60um discharge gap. In addition, the proposed structure with hump electrode shows lower firing voltage by 24V compared with the test panel with 160um discharge gap which doesn't have hump electrode though they have similar luminous efficacy.
董殷?(Eun-Joo Dong),玉政于(Jung-Woo Ok),윤초롬(Cho-Rom Yoon),李海準(Hae-June Lee),李?駿(Ho-Joon Lee),朴正后(Chung-Hoo Park) 대한전기학회 2008 전기학회논문지 Vol.57 No.4
To improve the luminous efficacy of PDPs, an AC PDP with new metal electrode structure is suggested. Operating voltage margin, power consumption, luminance, luminous efficacy, addressing jitter and ICCD image of test panel with proposed structure are measured, to compared with performances of the conventional ITO structure and proposed structures. To enhance luminous efficacy, we designed new structure which have asymmetric metal electrode structure. The experimental results show that the suggested structure shows luminance to maximum 89% and luminous efficacy to maximum 107% compared with conventional ITO standard structure. In addition, proposed structures with asymmetric electrode show low power consumption by 2~3%, high luminance by 5~7%, and high luminous efficacy by 2~3% compared with proposed symmetric electrode structures.
Comparison of Power Quality and Luminous Efficacy of Commercial Energy Saving Lamps in Thailand
Nitipong Somchaiwong,Ekkachai Chaidee 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
The objectives of this paper are the investigation and comparison of the electrical power quality and efficacy of energy saving lamps. These lamps consume less real power and produce higher relative illumination compared with traditional incandescent lamps. However, the energy saving lamps produce high total harmonic distortion (THD) that have effect to power quality problem. On the other hand those lamps operate at low power factor which is the demanding additional reactive power from the electrical utility. To investigation the power quality of lamps, the samples of commercial energy saving lamps in Thailand are tested. The experimental results are compared with standard incandescent and mercury lamps. The experiments were performed by using Luminous Flux Tester which is developed according IEC standard. We found that, the sample compact fluorescent lamps have lower energy consumption, higher illumination than the standard incandescent lamps, but high level of THD. The compact fluorescent lamps have higher efficacy than the mercury lamps. In this paper, the electrical and lighting characteristics of energy saving lamps are presented to verify the effectiveness of each lamp.
유일(Il You),손영주(Young-Joo Song),이영민(Young-Min Lee),옥정우(Jung-Woo Ok),남춘우(Choon-Woo Nahm),이돈규(Don-Kyu Lee) 대한전기학회 2012 전기학회논문지 Vol.61 No.11
AC-PDPs have recently achieved good performance and their image quality can sufficiently compete with the LCD TV. However, it is necessary more effort to improve the luminance and luminous efficacy in the PDP technology. The gas mixture ratio plays a very important role in discharge characteristics, but the mechanism of gas discharge is complex and complicated. In this paper, we investigate the mechanism of gas discharge with Ne+Xe miture ratio through zero and two dimensional fluid simulation.
조성용(Sung-Yong Cho),박정후(Chung-Hoo Park),유윤식(Yun-Sik Yu),이돈규(Don-Kyu Lee) 대한전기학회 2009 전기학회논문지 Vol.58 No.12
The effects of Si-doped MgO have been investigated in order to improve the material properties of the MgO protective layer in plasma display panels. A small amount of Si is added to the MgO pellet while the MgO layer is being deposited by using an electron-beam evaporation method. Both the surface characteristics of the protecting layer and the electro-optical properties of 4 in. test panels are investigated, such as XRD patterns, SEM images, firing and sustain voltages, secondary electron emission coefficient(γ), luminance, luminous efficacy and lifetime. The firing and sustain voltage are minimized when Si concentration is 0.038%, where the luminance and luminous efficacy increase up to 17% and 26% compared with that of the pure MgO film, separately, and lifetime also shows good characteristics.
Long Gap Hump 전극구조를 가진 ac PDP에서의 Xe-Ne 가스의 방전 특성 연구
許宗喆(Jong-Cheol Heo),玉政于(Jung-Woo Ok),李敦揆(Don-Kyu Lee),李海準(Hae-June Lee),李?駿(Ho-Jun Lee),朴正后(Chung-Hoo Park) 대한전기학회 2009 전기학회논문지 Vol.58 No.1
To increase the luminance and luminous efficacy in the discharge for alternating current plasma display panel (ac PDP), the increment of Xe contents and long discharge gap are necessary. However, the driving voltage and the cost of driving circuit increases in the high Xe contents and long discharge path condition. In this paper, a long gap ITO hump electrode (LGH) model for discharge cells of ac PDP is evaluated in the various Xe contents(5~20%). The discharge voltage of LGH structure is lower about 30V than that of ITO reference structure with same main discharge gap. The LGH structure has lower power consumption and higher luminance than those of reference structure, respectively. Also, the luminous efficacy of LGH structure is higher about 20% than that of ITO reference structure in the 20% Xe contents.