• 한국레이저가공학회지
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• 제11권1호
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• pp.1-6
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• 2008

We proposed new light guide panel (LGP) fabrication method exploiting laser-processed inner scatterers and surface pattern. The proposed method has achieved LGP performance improvement in both brightness and uniformity. The inner scatterers and surface pattern of grid type were fabricated with a 2nd harmonic Nd:YAG pulse laser engraving system and a $CO_2$ laser scanning system, respectively. In the implementation of LGP, inner scatterers was arranged in accordance with linear or curved pattern with changing density and surface pattern was engraved on the surface of an inner-scatterers embedded LGP. The increase of scatterers' density and the use of surface patterns in both linear and curved pattern provided high luminance and uniformity enhancement. While thecurved pattern incorporated with increased scatterers' density and surface patterns yielded brightness improvement with preserving good uniformity, the linear pattern showed highly localized brightness near the light entrance of the LGP. We can also observe that the uniformity was mainly determined by pattern of inner scatterers, and the brightness was improved by the higher density and the utilization of surface patterns. From the results, the use of laser-processed inner and surface patterns can be a potential alternative for efficient and simple LGP fabrication method.

• KIEAE Journal
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• 제14권5호
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• pp.13-20
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• 2014

Museums have developed various needs of the visitors and exhibits over the past two centuries. Currently, they have multiple functions of display, conservation, research and public education about artworks and cultural events. Therefore, exhibits should be displayed in various ways so that visitors can feel inter-relations with exhibits. The exhibition areas of museums should be provided with the stable lighting environment for visitors and artworks. For the study, I selected four museums, which were the Seoul Museum, the Mimesis Art Museum, the Seoul Museum of Art in Nowon and the National Museum of Modern and Contemporary Art in Gwacheon, and I measured illumination levels of the selected Museums, and then, I surveyed the visitors' responses on the lighting conditions of them. According to the results, the measurements of the illumination levels in the four museums showed that the illumination levels of them were effectively controlled to display the art works. However, the illuminance levels at some areas that drew the natural light as lighting source were much higher than recommended illumination values for museum. In the mean time, the answers of questionnaires showed that the natural light were so effective to light the museums although the natural light provided some areas with high illumination levels.

• 생물환경조절학회지
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• 제12권1호
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• pp.17-21
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• 2003

참외재배시 저광도 조건시 상품수량의 급격한 저하를 막기 위하여 본 연구가 수행되었다. 과실 비대기에 해당되는 착과후 10일부터 400 $\mu$mol$.$m$^{-}$2$.$S$^{-1}$정도의 저광도 조건이 지속되면 광합성 속도도 떨어지고, 엽록소 함량도 낮았으며 특히 요소 무엽면시비구의 광합성속도는 크게 저하되었다 당도에 있어서는 자연광에 비해 저광도 처리구가 전반적으로 낮았는데, 착과수가 많고 무엽면시비구일수록 낮았다. 발효과 발생률은 요소 엽면시비 유무에 관계없이 자연광에서는 4% 미만으로 발생되었는데, 저광도 조건에서는 10% 이상 발생되었다. 특히 저광도 조건에서 적과수를 적게 한 처리구일수록 발효과 발생률이 높았는데, 적과를 하지 않은 처리구는 각각 39와 48%로 매우 높은 발생율을 보였다. 수확시기 지연은 요소 엽면시비 유무와 관계없이 자연광에 비해 저광도 조건에서 늦어지는 경향을 보였는데, 적과수가 적을수록 지연정도는 심했다 주당 상품수량에 있어서는 저광도 조건하에서 자연광에 비해 16∼34% 수준 정도로 매우 낮은 수량을 보였는데, 요소 0.5% 액을 엽면시비하고 2개를 적과한 처리구가 34%수준으로 자연광에 비해 다른 처리보다 높은 상품수량을 보였다. 따라서 참외재배시 과실 착과후 10일경부터 강우 등에 의해 장기간 저광도 조건이 지속될 것으로 전망되면 상품수량의 급격한 저하를 막기 위하여 주당 6개의 착과 과실중에서 2개를 적과하고, 요소 0.5%액을 2회 정도 엽면시비 해주는 것이 바람직 할 것으로 사료된다.

• 한국환경과학회지
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• 제2권4호
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• pp.279-289
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• 1993

자연광 및 여러 파장의 광선과 NAA, GA$_3$, BA 등의 식물호르몬을 옥수수 유식물에 처리하여 엽록소-단백질 복합체 형성에 미치는 효과를 조사하였다. 자연광하에서 3 종류의 호르몬 처리는 전체적으로 엽록소-단백질 복합체, 특히 LHCP-1과 LHCP-3의 형성을 촉진하였으나, 2 종류의 호르몬 조합은 엽록소-단백질 형성에 효과적이지 못하였다. LHCP-1, CPA 및 LHCP-3 등의 광계 II 관련 엽록소 형성에 있어서 백색광은 자연광에 비하여 효과가 적었으나 적색광은 효과적이었다. 적색광하에서 식물호르몬의 단독처리는 엽록체 발달 초기에 광계 II의 엽록소-단백질의 양적 증가를 유도하였다. 한편, 적색광하에서 2 종류의 호르몬 조합 처리도 자연광하에서의 처리와는 대조적으로 광계 II의 엽록소-단백질 형성에 매우 효과적이었다. 이와 같은 결과는 광선처리의 효과가 호르몬처리 효과보다 엽록소-단백질 복합체 형성에 중요한 인자로 작용한다는 것을 시사해 준다.

• 대한치과보철학회지
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• 제33권2호
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• pp.281-299
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• 1995

The purpose of this study was to evaluate the degree of occlusal contact under the fixed implant prosthesis of partially edentulous patients which was hased on occlusal concept of implant prosthesis. From the patients who have free-standing implant supported prosthesis of unilateral partially edentulous area, occlusal and occlusal contact point of th enatural tooth side and implant side of light closure and heavy closure were analyzed by T-scan system throuht pre-and post-adjustment and the degree of occlusal contact was estimated by Shimstock. The following results were obtained : 1. The occlusal force of natural tooth side(NF) from mid-sagittal axis was relatively constant at light and heavy closure through pre-and post-adjustment, but the occlusal force of implant side(IF) was decreased significantly at light closure(P<0.01) and heavy closure(P<0.05) of post-adjustment. 2. Natural tooth side-implant side moment(MIMoment) fo occlusal force from mid-sagittal axis was significant(p<0.05) through pre-and post-adjustment and the deviation from mid-sagittal axis was increased at light closure of post-adjustment, but was decreased at heavy closure of post-adjustment. 3. Comparing the NF and IF, IF was greater at heavy closure of pre-adjustment, and NF was greater at light closure of post-adjustment, and the NF and IF was relatively equally distributed at light closure of pre-adjustment and at heavy closure of post-adjustment. 4. The number of occlusal contact point of natural tooth side(NC) was relatively constant through pre-and post-adjustment, but the number of occlusal contact point of implant side(IC) was significantly decreased(P<0.05) at light closure of post-adjustment, and was not significant but was lesser at heavy closure of post-adjustment. 5. Difference of the NC and IC was greater at light closure of post-adjustment, but it was less at heavy closure of post-adjustment, and therefore occlusal contact point of natural tooth side and implant side was relatively equally distributed at heavy closure of postadjustment. 6. When bilaterally distribution of occlusal force and occlusal contact point was established, degree of occlusal contact of implant suporoted prosthesis with opoosing teeth at light clousre was $34.13{\pm}21.69{\mu}m$.

• Journal of Plant Biotechnology
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• 제48권1호
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• pp.62-70
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• 2021

본 연구는 물만을 공급하는 수경방식에서 인공광원에 따른 새싹보리의 생장과 품질에 미치는 영향을 분석하였다. 생육기간이 지나면서 초장이 길어지는 것을 관찰할 수 있었으며 지상부의 경우 형광등 처리구가 가장 높았으며 다음으로 LED 처리구, 자연광 처리구 순이었다. 또 에탄올 소독 처리구보다 무소독 처리구의 생장이 더 빠른 것을 관찰할 수 있었다. 종자 파종량이 많을수록 수확된 새싹보리의 수확량은 증가하였는데, 자연광 처리구가 가장 적었으며 형광등 처리구가 가장 높았다. 새싹보리 추출물의 총페놀 및 총플라보노이드 함량은 자연광 처리구가 가장 높았으나 TEAC와 FRAP은 모두 형광등 처리구에서 가장 높게 나타났다. 필수아미노산 함량은 41.64 ~ 45.93 mg/g의 범위로 자연광 처리구가 다른 두처리구에 비해 상대적으로 높은 함량을 나타내었으며, 비필수아미노산 함량은 45.51 ~ 53.69 mg/g의 범위로 LED 처리구에서 가장 높았다. 총아미노산 함량은 LED 처리구에서 97.47 ± 6.30 mg/g으로 가장 높았으며, 필수아미노산(46.83%)보다 비필수아미노산(53.17%)이 더 많이 분포하였다.

• 한국의상디자인학회지
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• 제6권3호
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• pp.45-53
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• 2004

Natural dyes have poor colorfastness as a result of the exposure of the dyed fabric to sunlight encountered during the display or wearing. As colors on fabrics fade excessively under sunlight, it is a problem to infer and restore the historic textiles with natural-dyed fabrics to original colors. The object of this study is to analyse the factors affected to color change under light. In experimental, fifteen natural dyes were dyed by the Korean traditional dyeing methods onto natural fiber fabrics: cotton, silk, ramie, and flex. Total 49 dyed fabrics in combination with dyes and fibers were used for the specimen. The Weather-O-meter was used for evaluating the effects of exposure to light for 2.5 to 450 hours. The process of color changes in the CIEL *A*B* color-order system to the exposure time were determined by spectrophotometer at 10$^{\circ}$ observer. Sunlight exposure caused significant changes in the color of natural-dyed fabrics. The degree and nature of color changes on the fabrics were dependent on the combination of fiber and the type of dye used. The groups of violet(Lithospermum erythrorhizon Sieb.et Zucc.) and black color(Ailanthus altissima Swingle, Phus trichocarpa Miq) yielded excellent colorfastness to light. The group of indigo blue color(Polygonum tinctorium Lour.) was also very resistant to fading in both exposure except silk. Whereas the dye groups of Red, Yellow, Orange, Brown colors indicated greatest changes in fading, particularly Carthamus tinctorius L.

• Animal cells and systems
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• 제2권4호
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• pp.455-462
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• 1998

A survey was conducted on the inorganic and organic solute patterns of plants in connection with nitrate metabolism according to different light regimes (1.9, 16.0, 91.5 $Wm^{-2}$). Besides measuring in vivo NRA, we also quantitatively analyzed ater-soluble inorganic ions, organic acids, low molecular weight carbohydrates, amino aciss and total N (% DW). Among 4 Carex species, C. pilosa is known as shade-adapted species and the others as half (C. gracilis) to full (C. rostrata & C. distans) light-adapted species. Compared to species adapted to high light intensity, shade-adapted C. pilosa showed reduced productivity under the highest light intensity. In general, nitrate and amino acid levels decreased at higher light intensity, while sugar and organic acid concentrations increased. In C. pilosa osmolality tended to rise with increasing light intensity, while in the other species it tended to fall. Under low light intensity, the drop in soluble carbohydrate contents is osmotically compensated for by an enhanced nitrate concentration. It is concluded that competition between nitrate and $CO_2$reduction for reductants and ATP from photosynthesis may have important ecological consequences for the adaptation of plants to low or high light conditions. Additionally, the patterns of ionic changes due to increased light intensities were essentially the same in all selected species, indicating similar characteristics of heir mineral ion and organic acid metabolism as well as in field-grown Carex species.

• Bulletin of the Korean Chemical Society
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• 제35권4호
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• pp.1229-1232
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• 2014

• KIEAE Journal
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• 제12권6호
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• pp.113-121
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• 2012

A hospital is the most important infra-facility of the places which take care of people's body in social environment. There exist several environmental factors in the ways to heal the human body in hospital ward, but this study tried to look into the improvable pleasant sickroom environment with focus on light environment among the factors. In other words, this study aims at the research on proper daylight inflow into sickroom space as basic data for understanding the link between healing environment and natural lighting. In the simulation analysis through this research, this study completed the initial simulation using Autodesk Revit 2011 with focus on two types of individual multi-bed room units of the two general hospitals located in Gwangju City. This study made a simulation analysis of The two multi-bed rooms looking to the west using the weather data on Gwangju district, which is the strong point of ECOTECT2011. Conclusively, looking into the analysis of the simulation model in time of attaching the length of in & outside light shelf, the angle controlling of light shelf, the daylight factor and DA were found to show the tendency to decrease in the numerical value due to the decrease in sunlight inflow as the simulation model moved more toward the room from the window in comparison with the existing analysis of multi-bed rooms. Particularly, this study was able to read that the daylight factor and DA were more decreasing to improve at the light shelf than the existing bedrooms; conclusively, this study judges that the natural lighting simulation analysis could be helpful in improving the healing environment as basic data.