• KOREAN JOURNAL OF CROP SCIENCE
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• v.40 no.5
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• pp.543-547
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• 1995

This study was conducted to light intensity and night interruption on leaf production in perilla. Using two cultivars ; og-dong and Yeup-sil. The present studies were conducted to investigate effect of the light intensity and night interruption for prolongation of vegetative growth by flowering inhibition in the National Honam Crop Experiment Station, R. D. A, Iri, Korea. The results are summarized as followes, varietal differences of days to flower initiation were not significant by the light intensity and night interruption, however differences of days to flower initiation light intensity or night interruption treatment were higly significant. Flowering of perilla was prolongated in high light intensity and in long night interruption. Between the factors treated flowering of perilla was more influenced by light intensity than night interruption. Days to flower initiation of perilla were light intensity(0.5∼1 Lux) in 30 mins night interruption, however 3∼10 light intensity in 60 mins night interruption and 30∼100 Lux light intensity in 10, 30, 60 mins night interruption treatment were not flowering. Plant height, leaf area and dry weight of perilla were the highest in 30∼100 Lux light intensity treatment than in the other treatments. The results would be avaliable establish year-round production methods for low cost of perilla leaf.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.131-133
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• 2015

일반적으로, 태양광 발전은 최대한 오랜 시간 많은 양의 태양광을 받을 수 있는 방법이 중요하다. 본 연구에서는 태양광 수집 량을 높이기 위해 태양 전지판에 매트릭스 형태로 배치된 광센서의 조도차를 이용한 자동 태양광 추적 및 충전 시스템을 제안한다. 제안하는 시스템은 날씨 및 주변 환경의 조도 간섭 등과 같은 환경 상태정보를 광센서로부터 획득한 조도 정보와 함께 태양의 방향을 추적하기 위한 알고리즘에 적용한다. 본 시스템을 통해 사용자는 좁은 공간에서도 최대한의 태양광을 집적할 수 있으며, 적은 비용으로 효율성 있는 태양광 발전 시스템을 구축 할 수 있다.

• Proceedings of the Korean Information Science Society Conference
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• 2012.06d
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• pp.381-383
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• 2012

식물재배용 인공광 최적 배치에 따른 균일한 조도 분포는 고품질의 식물 생산을 가능하게 한다. 그러나 기존에 상용화된 식물재배시스템의 경우, 인공광 배치에 따른 조도 분포 시뮬레이션 등의 전처리 과정이 생략된 채 제작되어 생산 품질의 편차를 초래하는 문제점을 가지고 있다. 이에 본 논문은 식물재배단의 광 균일도 향상을 위해 조명 설계 소프트웨어인 Relux를 이용하여 LED 조명장치의 높이, 간격 등의 배치를 달리함에 따라 변화하는 각 재배단의 조도 분포 및 균일도, 그리고 전체 에너지 소비량 등을 사전에 시뮬레이션 함으로써 대상 식물재배에 적합한 조명장치의 최적 위치를 파악하고자 한다. 또한, 포터블 조도측정기를 이용하여 재배단의 각 식물의 위치를 기준으로 실 측정한 결과 데이터와 비교 분석 과정을 거쳐 본 시뮬레이션 결과의 신뢰도를 입증하고자 한다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.7
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• pp.58-62
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• 2017

In this study, the design conditions for the Korean-style glass greenhouse structure has been reduced to achieve the most efficient use of natural light. The AGI program was simulated for the optimal conditions of daylight in a glass greenhouse. From the results of daylight simulation, the axis position of the glass greenhouse's roof was not an important factor in the daylight effects regarding illumination and uniformity. In summer, there were long periods of daylight and high illumination levels. The illumination value of daylighting increased with increasing glass transparency value, and the illumination value was greatest at 14:00 hours. At this time, the rate of light variation according to the glass transparency was 89 [lux/%]. In addition, the optimal design conditions for the glass greenhouse were established, which were a $30[^{\circ}]$ or $150[^{\circ}]$ installation angle and higher transmittance of glass.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.14-16
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• 2012

본 논문은 단일 추적모듈과 무선 센서 네트워크를 이용한 내장형 태양광 추적시스템을 제안한다. 내장형 태양광 추적시스템은 조도 변화에 따라 단일 추적모듈로부터 도출된 회전값을 무선 센서 네트워크로 발전모듈에게 전달하여 태양전지를 동일하게 회전시키는 시스템이다. 추적모듈은 조도측정부의 양단 간 조도 값을 비교하여 회전값을 도출하고 항상 태양광과 프레임이 수직이 되도록 유지한다. 발전모듈은 전달받은 회전값을 적용하여 추적모듈과 동일한 방향으로 유지함으로 발전량을 최대화한다. 테스트베드를 개발하여 추적 실험을 통해 제안된 시스템의 타당성을 검증하였다.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.05a
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• pp.30-37
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• 2005

태양광 채광시스템은 자연광의 유입이 어려운 공간에 주광을 유입하기 위하여 개발된 장치로써 에너지를 절약하고 인간의 쾌적성을 향상시키는 등 지속가능한 건축을 위해 도입 및 확대가 크게 기대 되는 장치이다. 이에 본 연구는 기존에 본 연구실에서 개발된 시스템의 문제점을 보완하고 개선하여 건축물 적용시의 채광성능을 평가하는데 연구목적이 있다. 본 시스템의 설치는 2004년 10월 25일 (주) 동아산전과의 공동작업으로 설치되었으며, 수원에 있는 K대학 공과대학 5층 옥상 파라펫에 설치하였다. 평가실험은 2005년 4월 5일 9시30분부터 15시30분까지 청천공 상태에서 실시하였고, 총32개의 측정점을 선정하여 주광조도비로 채광성능을 평가하였다. 실험결과, 반사거울을 설치 시 창이 있을 경우 실내의 주광조도비는 평균 20.3[%] 상승하였고 창을 제거할 경우 실내의 주광조도비는 평균 38.2[%]정도 상승하여 채광학적으로 유효한 것으로 분석되었다. 따라서 본 시스템은 건축물의 실내 및 옥외의 음영진 곳에서 유용하게 사용될 수 있음이 입증되었다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.3
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• pp.333-338
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• 2021

This study determined the characteristics of LED illumination and photosynthetically active radiation flux density (PPFD) for LED lighting design in an indoor plant factory. This was done based on the light wavelength and PPFD intensity required for plant growth. It has been found that the wavelength and intensity are decreased according to the measuring distance, and green light has an important role in illumination characteristics, while blue light has an important role in the PPFD characteristics. Considering only the photosynthetic properties of plants, the effective order of photosynthesis was blue>red>white>green. When the measurement distance was 30 [cm], it was found that reduction levels of 60 [cm], 90 [cm], and 120 [cm] decreased to about 36 [%], 18 [%], and 10 [%], respectively. As a result of the characteristics of mixed light (red:blue=2:1, 3:1, 4:1) and the measurement distance, when the measured value at 30 [cm] is 100%, the measured value at 120 [cm] is 10-11 [%]. From the obtained results, an optimal structure was proposed for maximizing the light efficiency of an indoor greenhouse for future research.

• Journal of the Korean Institute of Landscape Architecture
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• v.37 no.3
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• pp.113-124
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• 2009

This study has attempted to calculate the intensity of illumination for the optimal growth environment of indoor plants after analyzing both damage to plant species and growth conditions as impacted by light conditions for the Kyobo Life Insurance greenhouse. The optical intensity of illumination has been estimated after investigating the problems of growth conditions based on an analysis of illumination by light condition, dead tree replacement cycle(weeks) and rate of damage of plant species. According to the investigation of illumination, the lowest difference was observed between the shaded spot in the south(531lux) and the sunny spot(602lux) while the largest difference(nearly 500lux) was detected between the shaded spot in the central area(210lux) and the sunny spot(782lux). According to an analysis of dead trees from 1990 to 2004, in terms of dead tree replacement cycle, Viburnum awabuki was the highest(161weeks), followed by Phyllostachys spp.(84weeks), Camellia japonica and Ternstroemia japonica(40weeks). Regardless of plant species, damage rate of plant were lower in the shaded spot and higher in the sunny spot. According to correlation and regression analyses with the intensity of illumination as an independent variable and the damage rate of plant species as a dependent variable, the damage rate of plant species increased as the intensity of illumination decreased. A dramatic decline in the rate of damage was observed at $500{\sim}600lux$. At 700lux, it reached the lowest level.

• Korean Journal of Optics and Photonics
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• v.30 no.5
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• pp.197-203
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• 2019

In this paper, we studied a reflector design that can improve the illuminance uniformity when using a xenon flash lamp in the photonic sintering process. To achieve complete sintering of substrates in the irradiated area, the light efficiency and illuminance uniformity were set to target performance. Existing elliptical reflectors or parabolic reflectors make it easy to satisfy the target light efficiency, but have difficulty satisfying the illuminance uniformity. In this paper, a twin-concave feature has been added to the center of the parabolic reflector to satisfy the illuminance uniformity. It was confirmed that the illuminance uniformity of the parabolic reflector with a twin-concave feature was improved, compared to that of the traditional reflector.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.5
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• pp.8-14
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• 2003

The daylight responsive dimming system, which uses daylight and automatically controls the light output of electric lighting according to the amount of 3.vailable daylight, is an energy saving system Successful performance relies on how photosensor signal can precisely represent workplace illuminance. However, it is not accurately identified due to the dynamic nature of the sun and the sky changed with respect to different seasons or time. The purpose of this research is to identify the correlation between workplace illuminance and photosensor signals, and propose an optimal location and spatial characteristics of the photosensor through experiments, which minimizes the above impacts and improve system performance.