• 반도체디스플레이기술학회지
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• 제18권3호
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• pp.19-24
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• 2019

In this study, the Ag nano-dots structure was applied to the textured wafer surface to improve the light trapping effect of crystalline silicon solar cell. The Ag nano-dots structure was formed by the annealing of Ag thin film. Ag thin film deposition was performed using a thermal evaporator. The effect of light trapping was compared and analyzed through light reflectance measurements. The optimization process of the Ag nano-dots structure was made by varying the thickness of Ag thin film, the annealing temperature and time. The thickness of Ag thin films was in the range of 5 ~ 20 nm. The annealing temperature was in the range of 450~650℃ and the annealing time was in the range of 30 ~ 60 minutes. As a result, the light reflectance of 10 nm Ag thin film annealed at 650℃ for 30 minutes showed the lowest value of about 9.67%. This is a value that is about 3.37% lower than the light reflectance of the sample that has undergone only the texturing process. Finally, the change of the light reflectance by the HF treatment of the sample on which the Ag nano-dots structure was formed was investigated. The HF treatment time was in the range of 0 ~ 120 seconds. As a result, the light reflectance decreased by about 0.41% due to the HF treatment for 75 seconds.

• Preventive Nutrition and Food Science
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• 제7권2호
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• pp.179-183
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• 2002

Lycopene as a natural antioxidant may provide protection against a broad range of epithelial cancers and chronic diseases. Lycopene concentrate extracted from tomatoes can be used as functional food. Lycopene would undergo degradation via isomerization and oxidation under different processing conditions, which impact its bioactivity and reduce the fuuctionality for health benefits. Heat and light induce lycopene oxidation and isomerization of all-trans form to cis form. The effects of thermal treatment and light irradiation on the stability of lycopene were determined. Results have shown that lycopene stability depends on the extent of oxidation and isomerization. Cir-isomers are less stable than trans-isomers. The level of cis-isomers increased as treatment time increased but only for a short period during the beginning of the treatment. The major effect of thermal treatment and light irradiation was a significant decrease in the total lycopene content. A true assessment of health benefits of lycopene concentrate depends on the lycopene content and the composition of all trans-isomers and cia-isomers.

• 한국환경농학회지
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• 제32권3호
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• pp.193-200
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• 2013

형광등이나 LED와 같은 인공광을 사용하는 식물공장(인공광 식물공장)은 계절에 상관없이 광, 온도 및 습도 등을 인위적으로 제어하면서 작물을 안정적으로 연중 생산할 수 있는 시스템이다. 본 연구에서는 수경재배 방식을 채택하고 있는 인공광 식물공장 시스템 내에서 엽채재배용 배양액을 이용한 방풍나물의 수경재배 가능성과 혼합광질이 생장에 미치는 영향을 검토하였다. 방풍나물은 청색과 적색 LED를 1:1 및 1:3의 비율로 혼합한 혼합광 조건에서 90일간 수행하였다. 광원의 광강도는 $100{\mu}mol/m^2/s$로 설정한 후 30일 간격으로 지상부 잎을 3회 수확하여 생장량을 조사하였다. 재배기간 동안 형광등과 LED의 혼합광 조사는 방풍나물 지상부 생장에 유의한 영향을 미치는 것으로 나타났다. 재배개시 30일째 방풍나물 지상부 생체중 및 건물중은 형광등+청색+적색의 혼합광(청, 적색 혼합비율 1:3, FLBR13구)에 의한 영향을 받아, 대조구인 형광등 조사구(FL구)에 비해 각각 3.7배 및 2배 증가하였다. 또한 식물체당 전개엽수는 FLBR13구에서 형광등+청색+적색 혼합광(청, 적색 혼합비율 1:1) 조사구인 FLBR11구에 비해 유의하게 증가하였다. LED와 형광등을 혼합 조사한 처리구에서와 같이, 형광등을 혼합하지 않고 청색과 적색의 LED만을 혼합하여 조사한 처리구에서도 청색과 적색의 혼합비율이 1:1인 BR11구에 비해 적색광의 혼합비율을 3배 증가시킨 BR13구에서 방풍나물의 지상부 생장이 촉진되었다.

• Journal of Animal Science and Technology
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• 제64권5호
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• pp.985-996
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• 2022

This study investigated the effects of light intensity on growth performance, blood components, eye condition, and carcass characteristics of broiler chickens. Three hundred and fifty-two 1-day-old male chicks were assigned to one of four treatments (four repetitions per treatment, 22 birds per repetition) and reared in a floor pen for 5 weeks. From the second week, chicks were reared under four different levels of light intensity (5, 20, 35, and 50 lx) and the lighting duration was maintained at 18-hours light : 6-hours dark (18L : 6D). The feed intake and body weight were measured weekly. At 35 days of age, 12 birds per treatment were randomly selected for blood sampling, eye measurement, and carcass analysis. There were no significant differences in body weight gain, feed intake, and feed conversion ratio among treatments. Triglyceride levels in the serum were significantly higher in the 5 lx treatment, and creatinine was significantly lower in the 5 lx treatment (p < 0.05). The heterophil : lymphocyte ratios decreased significantly as light intensity increased (p < 0.05); however, other blood cell compositions were not affected by light intensity. Interleukin-6 content was significantly higher in the 5 lx treatment than in other treatments (p < 0.05), but the content of tumor necrosis factor-α was not significantly different among treatments. Serum corticosterone concentration was significantly higher at 5 lx than at 20, 35, and 50 lx (p < 0.05). The corneal diameter was the highest in 5 lx treatment (p < 0.05), and tended to increase as the light intensity decreased. Other eye parameters were not significantly different among treatments, but displayed a tendency to increase as the light intensity decreased. Carcass yield and part yields were not affected by light intensity. Meat quality parameters (pH, color, cooking loss, and water-holding capacity) did not show significant difference among the treatments. The results indicate that a light intensity of 5 lx may increase physiological stress or have a negative effect on broiler welfare, even if the performance and carcass characteristics are not affected. Therefore, a light intensity of 20 lx or above is recommended considering both the growth performance and welfare of broilers.

• 한국작물학회지
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• 제39권4호
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• pp.307-316
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• 1994

광전역이 수도엽신의 광합성에 미치는 영향을 구명코져 일반형 2품종(추청벼, 화진벼)과 통일형 2품종(삼강벼, 칠성벼)에 대하여 분얼기에서 출수기에 이르는 기간동안 무처리, 30%, 70% 차광처리하여 분얼기와 출수기에 고저 광도 조건하에서 광합성 특성 및 이와 관련한 생리, 생태적 특성을 검토한 결과를 요약하면 다음과 같다. 1. 차광처리에 의한 건물중의 감소는 70% 차광처리구에서 많았으며, 분얼기보다 출수기가 현저하였고, LAR 및 SLA도 출수기에 높았다. 2. 분얼기 저광도(5Klux)하의 개체의 광합성 능력은 낮은 편이며, 무처리<30%<70% 차광처리의 순이었고, 고광도(33Klux)하에서는 무처리구 보다 30% 차광처리구가 가장 높았다. 3. 출수기에 단엽의 광합성 능력은 무처리에 비하여 70%차광처리구가 오히려 높았다. 4. 광합성에 대한 호흡비율(Respiration/Photosynthesis${\times}$100)은 무처리구에 비하여 차광처리구에서 전반적으로 낮았다. 5. CGR, RGR, NAR은 무처리구에 비하여 차광정도가 높을수록 감소하였다. 6. 차광처리는 수량 구성요소중 특히 1수 영화수를 감소시켜 정조수량이 감소되고, 따라서 수확지수도 저하되었다.

• 한국자원식물학회:학술대회논문집
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• 한국자원식물학회 2020년도 추계국제학술대회
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• pp.61-61
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• 2020

This experiment was carried out using artificial bed soil and LED in the plastic film house(irradiation time: 07:00-17:00/day). Seedlings(n=63 per 3.3 m²) of ginseng was planted on May 17, 2018. LED was combined with red and blue light in a 3:1 ratio and irradiated with different light intensity(40-160 µmol/m²/s). Average air temperature from April to September according to the light intensity test was 20.4℃-20.9℃. Average artificial bed soil temperature was 20.1℃-21.7℃. The test area where fluorescent lamp was irradiated tended to be somewhat lower than the LED irradiation area. The chemical properties of the test soil was as follows. pH levels was 6.6-6.7, EC levels 0.9-1.3 dS/m and OM levels 30.6-32.0%. The available P₂O₅ contents was 73.3-302.3 mg/kg. Exchangeable cations K and Ca contents were higher than the allowable ranges and mg content was high in the fluorescent lamp treatment. The photometric characteristics of LED light intensity are as follows. The greater the light intensity, the higher the PPFD(Photosynthetic Photon Flux Density) value, illuminance and solar irradiation. Fluorescent lamp treatment had high illuminance value, but PPFD and solar irradiation were lower than LED intensity 40 µmol/m²/s treatment. The photosynthetic rate increased(2.0-3.8 µmolCO²/m²/s) as the amount of light intensity increased, peaking at 120 µmol/m²/s, and then decreasing. The SPAD (chlorophyll content) value decreased as the amount of light intensity increased, and was the highest at 36.1 in fluorescent lamp treatment. Ginseng germination started on April 5 and took 14-17 days to germinate. The overall germination rate was 68.8-73.6%. The growth of aerial parts(plant height etc.) were generally excellent in the treatment of light intensity of 120-160 µmol/m²/s. The plant height was 41.9 cm, stem length was 24.1 cm, leaf length was 9.8 cm and stem diameter was 5.6 mm. The growth of underground part (root length etc.) was the best in the treatment with 120 µmol/m²/s of light intensity. Due to the root length was long(24.8 cm) and diameter of taproot was thick(18.7 mm), the fresh root weight was the heaviest at 24.8 g. There were no disease incidence such as Alternaria blight, Gray mold and Anthracnose. Disease of Damping-off caused by Rhizoctonia solani occurred 0.6-1.5% and incidence ratio of rusty root ginseng was 30.8-62.3%. It is believed that the reason for the high incidence of rusty root ginseng is that the amount of field moisture capacity of artificial bed soil is larger than the soil. Leaf discoloration rate was 13.7-32.3%.

• 한국작물학회:학술대회논문집
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• 한국작물학회 2017년도 9th Asian Crop Science Association conference
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• pp.215-215
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• 2017

The preference for domestic cereal crop of Setaria Italica has been increased with the recent interest in healthy foods. However, the productivity of Korean domestic produce, which has been decreasing due to the lack of cultivation technology and the low rate of mechanization during cultivation. Increase of germination ability will have a positive effect on the cultivation by reducing the labor of the manpower consuming and weeding work. Therefore, red light, ultrasonication, liquid priming and liquid smoke treatment that are effective for the germination of the seeds evaluated. The seeds of 1.4mm or more were used for the experiment. The priming solution used in the experiment was 1% $KH_2PO_4$ (74mM). During the priming, the light treated seeds at 2000 lux for 15, 30, 60 and 120 minutes. Ultrasonicationd treatment was performed for 5, 10, and 20 minutes at exposures of 60%, 80%, and 100% of ultrasound up to 21.6 kHz during priming. Light or ultrasound treated seeds transferred to priming treatment at $15^{\circ}C$ for 24 hours. The treatment of the liquid smoke was divided into the treatment of the liquid smoke alone and the treatment of the liquid smoke with the priming. The liquid smoke alone was diluted with distilled water without priming solution and the treatment of the liquid smoke was diluted with the salt priming solution. Both treatments were performed at 0.0%, 0.5%, 1.0%, 5.0%, and 10.0% of the liquid smoke (pH7) concentration at $15^{\circ}C$ for 6 hours. After each treatment, the seeds were dried to moisture content ranged 5-8% at $25^{\circ}C$ for 24 hours. All treatments showed better results than the non-treated control. Light treatment for 120 minutes improved for germination percentage (GP), Germination uniformity (GU) and heath seed percentage (HS). Ultrasonication treatment was most effective when treated with ultrasound at 21.6 kHz for 5 minutes in all germination characteristics. Ten % of the liquid smoke increase in 92% GP, 1.8 days MGT, $54%{\cdot}day^{-1}GR$, 0.76 GU and 88% HS comparing to non-treated control (72% GP, 2.3 days MGT, $45%{\cdot}day^{-1}GR$, 1.48 GU, and 63 % HS). This study showed that it is possible to obtain high germination by adding liquid smoke treatment to the seeds supplied to the farmers. The efficacy of light, ultrasonication, inorganic salt priming, and liquid smoke treatment on the seeds found in the experiment will be a positive alternative to labor force problems in the cultivation by improving germination.

• 생물환경조절학회지
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• 제22권3호
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• pp.214-219
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• 2013

본 실험은 임파첸스 분화식물의 생장과 개화에 LED 광질과 효과 적정 처리 시간을 구명하기 위해 수행되었다. 임파첸스의 초장은 2.50cm로 청색광에 의해 촉진되었으며 대조구에 비해 0.6cm의 차이를 보였다. 절간수, 뿌리길이, 분지수, 직경은 보광시간이나 광질에 영향을 받지 않았다. 엽면적은 412.81$cm^2$의 대조구에 비해 광질처리 시 626.64~784.53$cm^2$로 증가하였다. 광질처리에 의해 화아수와 개화수는 감소하는 경향을 보였다. 그러나 개화소요일수는 광질처리에 의해 단축되어 개화를 촉진하였으며 적색광에서 좋았다. 엽록소 함량은 광질처리에 의해 크게 영향을 받지 않았으나, 안토시아닌 함량은 전반적으로 일몰 후 4시간의 청색광에서 증가하였다. 광질처리는 청색광 처리에서 생체중과 건물중이 향상되었다.

• 식물조직배양학회지
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• 제27권1호
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• pp.19-23
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• 2000

사과 자엽조직으로부터 기내에서 식물체를 재분화시키는 데에 있어서 배양 광조건 및 절편체 극성과의 관계를 살펴보고자 사과‘Fuji’품종의 자엽을 재료로하여 광조건 및 광질을 달리하여 배양하였고, 또한 여러 가지 형태의 절편체를 사용하여 시험을 수행하였다. 배양환경조건 중 광조성에 따른 신초 재분화율을 본 결과 배양 초기 10일간 암배양한 후 명 배양한 처리구에서 가장 높은 재분화율을 나타내었으며, 배양중기의 암처리는 효과가 없었다. 광질별로 비교할 때 전처리로 4일간 암배양한 후 청색광을 조사한 처리구에서 높은 신초 재분화율을 나타내었다. 신초 재분화 유기와 절편체 극성과의 관계를 보면 모든 신초의 형성은 절제된 자엽의 기부 끝쪽에서만 이루어졌다. 즉, 기부쪽 절편체의 말단부 절단면에서보다는 기부쪽 절편체와 말단 절편체의 기부쪽 절단면에서 식물체의 재분화가 이루어짐을 알 수 있었다. 신초 유기는 배축의 기부쪽 자엽 절편체 에서 매우 높게 나타난 반면 자엽의 말단부위에 가까운 곳에서는 현저히 감소하였다.

• Journal of Plant Biotechnology
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• 제1권2호
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• pp.117-121
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• 1999

Effects of jasmonic acid treatment, UV-B and white light treatment on the anthocyanin biosynthesis and cell growth were investigated using the cell suspension culture system of grape (Vitis vinifera L.). Cell growth was not affected by white light irradiation, while it was remarkably suppressed by UV-B irradiation from 8 to 32 h. Anthocyanin accumulation dramatically increased after 16 h from irradiation of UV-B. Simultaneous treatment of jasmonic acid and UV-B increased anthocyanin accumulation by 10-fold. The cell division was restored when anthocyanin was abundantly accumulated after 32 h from UV-B irradiation. Optimum concentration of jasmonic acid was found to be 5 uM for maximum accumulation of anthocyanin. Application of jasmonic acid to grape suspension cells rapidly induced the expression of CHS gene after 2 h from treatment and showed maximum level at 32 h. Simultaneous treatment of jasmonic acid and light also induced CHS gene expression after 2 h, but the maximum level of CHS transcript was observed at 16 h with white light and 8 h with UV-B exposure. The synergistical effects could be explained by the defense mechanism that UV irradiation is mediated in part by alterations in JA and its signaling pathway.