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도로 조명 설계에 있어서 취도-조도 환산계수 적용에 관한 검토
주윤석(Youn-Suck Joo),이동호(Dong-Ho Lee),여인선(In-Seon Yeo),지철근(Chol-Kon Chee) 한국조명·전기설비학회 1998 한국조명·전기설비학회 학술대회논문집 Vol.1998 No.-
In this paper it is examined the validity of luminance-to-illuminance conversion factor in the roadway lighting design. Luminance and illuminance distribution patterns were measured to yield the calculated conversion factor on the newly-constructed highway, and this value was compared to the conversion factor commonly used. We found that some discrepancy might exist between them due to difference in the values between the luminance yield factor and the coefficient of utilization. Therefore this fact must be fully understood in the roadway lighting design process.
형광체층 위치에 따른 LED 패키지의 열 특성에 관한 연구
김완호(Wan-Ho Kim),구대형(Dai-Hyoung Koo),임기태(Ki-Tae Lim),여인선(In-Seon Yeo) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.11
In this paper, we studied for the thermal property LED package depending on the amount of phosphor and position of phosphor layer. The white light was released by energy conversion of phosphor from the blue to yellow range light. However, the heat was also generated according to the quantum efficiency of phosphor leading to the increment of internal temperature of LED package. When the thermal property of LED package was investigated by varying the phosphor concentration, the temperatures of packages with 50 and 100wt% of phosphor were increased by 17 and 19.2℃, respectively compared to the package without phosphor. Also, the heat characteristic was evaluated by changing the phosphor positions such as precipitation, dispersion, and reverse precipitation. In the LED package fabricated with a precipitation layer, the temperatures of upper and lower part were 70.1 and 64.0℃ and their temperature difference was 5.9℃. In the case of LED package with dispersion layer, the temperatures of upper and lower part were 77.2 and 63.0℃ and the temperature difference was 14. 2℃. The package with reverse precipitation layer showed the highest (91.4℃) and lowest (62.1℃) temperatures because the heat was not effectively transferred from phosphor layer to LED chip due to long distance between them.
TiO₂ 분산 안정성 제어를 통한 LED 패키지 광 특성 및 색 균일성 향상에 대한 연구
임기태(Ki-Tae Lim),김완호(Wan-Ho Kim),여인선(In-Seon Yeo) 한국조명·전기설비학회 2017 조명·전기설비학회논문지 Vol.31 No.11
In this study, the carbon length of the TiO₂ surface property was controlled by using other surface materials in order to improve the light characteristics and color uniformity of the white LED. The surface physical properties of the TiO₂ particles were adjusted in the same manner as the physical properties of the silicone encapsulating material to ensure the dispersion stability. and The improved dispersion stability enabled to prevent the precipitation and aggregation of the particles which enhances the scattering efficiency of TiO₂. As a result of the measurement of optical characteristics, total luminous flux improvement of 3 to 8% occurred in the LED package manufactured using the surface modified TiO₂, and deviation of color uniformity due to angle could be improved.
이용필(Yong-Pill Lee),여인선(In-Seon Yeo) 한국조명·전기설비학회 2018 조명·전기설비학회논문지 Vol.32 No.3
In this study, we established and devised optical design goals for the ‘ LED roadway lighting with low-level mounting’, which analyzes problems with existing streetlights and existing low-lightness problems. Further, the analysis of various types of light emitted and the suitability of road illumination performance indicators through the field survey process and the feasibility of evaluating the characteristics of various aspects, including maintainability, design, and standardization, were proposed.
백색 LED의 광학적 특성 향상을 위한 레이저 경화에 관한 연구
김완호(Wan-Ho Kim),이유성(Yu-Seong Lee),김재필(Jae-Pil Kim),여인선(In-Seon Yeo) 한국조명·전기설비학회 2019 조명·전기설비학회논문지 Vol.33 No.1
In this paper, we studied for improving color uniformity of white LED by using laser curing method. Silicone encapsulant was cured at high speed through the laser curing process, resulting in the improvement of phosphor dispersibility. Luminous flux, color temperature distribution and reliability test of prepared white LED package were evaluated to compare the photo-performance of LED PKG prepared by convection oven or laser curing process. The difference in precipitation speed by encapsulation viscosity and phosphor specific gravity affected the spectrum, color temperature and color uniformity of white LED package. The optical structure with surface light distribution was designed for the uniform laser irradiation and the curing process was carried out using homogenizer. As a result of measurements, through the laser curing process, luminous flux was improved by 6.0% and color temperature was 280K lower and the color temperature distribution was less than 110K. The reliability test of the high-temperature and high-humidity operation life evaluation was improved by 9%.
M. sympodialis 억제 및 HFDPC 활성 효과를 갖는 두피 케어용 LED의 광학 특성
문민중(Min-Joong Moon),이지범(Jie-Beom Lee),여인선(In-Seon Yeo) 한국조명·전기설비학회 2019 조명·전기설비학회논문지 Vol.33 No.1
In this paper, we studied the optical properties of LEDs that inhibit Malassezia sympodialis and activate HFDPC(Human follicle dermal papilla cells) to prevent dandruff and hair loss. The optical data of the test results confirmed measurement traceability by calculating the horizontal irradiance irradiated directly to the cells. In the test results, when irradiated with light of 393 ± 3nm, it was found to be effective in improving antifungal performance when increasing the horizontal irradiance while lowering the energy density in the effective energy range where the light absorption of M.sympodialis is easy. In the scalp cell activation test, light was irradiated to HFDPC at an energy density of 5 ± 0.17J/㎠ with the 630 ± 1nm LED and the energy density of 20 ± 1.22J/㎠ with the 850 ± 1nm LED. As a result, the incidence rates of IGF-1 and VEGF, which are hair growth promoting factors, were increased by 38% and 44%, respectively, compared to the normal group not irradiated with light. In particular, when the 850 ± 1nm LED is irradiated, the Incidence of the inflammatory factor(COX-2, MMP-2) is not changed compared to the normal group.
송상빈(Sang-Bin Song),곽재영(Jae-Yong Gwarg),여인선(In-Seon Yeo),임건호(Keon-Ho Lim) 한국조명·전기설비학회 1999 한국조명·전기설비학회 학술대회논문집 Vol.1999 No.-
In this paper we develop an electronic starter circuit that is suitable for Neon sign operation of switch-start fluorescent lamps. The developed starter enable single pulse ignition of fluorescent lamp at the peak point of preheating current, irrespective of the position of the Turn-On signal. This is possible due to the sequential operation of two transistors different in their operation characteristics and a diode operation characteristic. The switching endurance test using this starter has been carried for more than 3000 hours for a single switch-start on a severe blinking condition of preheating of 0.1s and of successive lighting interval of 0.1s.
김태성,여인선,이진,Kim, Tae-Seoung,Yeo, In-Seon,Lee, Jin 한국조명전기설비학회 1988 조명.전기설비 Vol.2 No.1
각종 전기설비용 절연재료로 주목받는 Epoxy는 경화제와의 가교반응으로 전기절연특성이 우수한 경화물질을 얻을 수 있으며, 경화제의 종류와 격자 형성에 형태에 따라 경화된 Epoxy의 특성이 결정된다. 본 연구는 Epoxy의 경화시 분위기의 온도를 변화시켜 격자형성의 진행형태를 변화시키고, 경화된 Epoxy의 제반특성을 조사하여 전기절연특성이 가장 우수하게 되는 경화온도를 얻고자 한다. Epoxy를 분위기 온도 $20~50[^{\circ}C]$사이에서 $5^[{\circ}C]$ 간격으로 변화하면서 경화시킨 결과, 분위기 온도 $30[^{\circ}C]$에서 경화된 Epoxy의 전기절연특성 및 기계적 강도가 가장 우수하다고 판명되었다. Epoxy, noticed as a new insulation material tor electrical installation, may become an excellent cured material from the crosslink reaction with some curing agents. The characteristics of cured Epoxy is determined by the kind of the curing agents and the method of lattice formation. The purpose of this paper, varing the process of lattice formation by various surrounding temperatures during the curing process, is to obtain the optimum curing temperature for electrical insulation from the results of investigation on the properties of cured Epoxy. In the experiment, Epoxy was cured at various temperatures between $20[^{\circ}C] and 50^[{\circ}C]$ which differ by $5^[{\circ}C]$, and then examined on the electrical insulation haracteristics as well as the thermal and mechanical stability. As a result, it is concluded that the optimum electrical insulation characteristis and mechanical strength of cured Epoxy can be obtained when cured at a surrounding temperature at $30[^{\circ}C]$.