• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2005.11a
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• pp.57-60
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• 2005

자연채광은 실내공간의 쾌적성을 향상시키며, 재실자의 건강을 증진시킬 뿐만 아니라 에너지 절약적인 측면에서 시너지 효과를 발휘하고 있다. 이에 반사거울형 태양광채광시스템은 도시가 과밀하고 고층화됨에 따라 자연채광의 도입이 어려운 실내공간에 태양광을 도입할 수 있는 자연에너지 활용장치라 할 수 있다. 본 연구는 태양광채광시스템을 이용하여 주거건물 옥상에 1차반사거울을 설치하고, 반지하의 상부에 2차반사거울을 설치하여 거실공간에 태양광을 유입하였다. 시스템 미설치시와 설치시에 대한 거실의 바닥면조도와 외부조도를 동시에 측정하여 외부조도에 대한 내부조도의 비율인 주광조도비를 분석하고, 증감율을 구하여 반사거울형 태양광채광시스템의 성능을 평가하였다. 채광성능평가 결과 채광시스템의 설치로 인한 실내 주광조도비는 평균 $80{\sim}1,400%$정도 증가하는 것으로 나타났으며, 또한 창면부에 비해 실의 후면부가 2배 이상 증가한 것으로 나타나 채광성능이 매우 큰 것으로 나타났다. 따라서 본 연구에서 실험한 반사거울형 태양광 채광시스템은 주거건물에서의 적용이 용이하고 높은 채광성능을 제공할 수 있어 실내 빛환경 향상에 크게 기여할 수 있을 것으로 기대된다.

• Proceedings of the Korean Vacuum Society Conference
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• 2010.02a
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• pp.298-298
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• 2010

최근 태양전지 연구가 활성화 되면서 다양한 종류의 태양전지가 만들어 지고 있다. 이에 따라 태양전지를 정확하게 분석하고 평가하는 방법에 대한 중요성이 커지고 있다. 태양전지의 성능과 품질을 평가하는 방법은 인공태양광조사장치(Solar Simulator)를 사용하여 태양전지의 전류와 전압특성을 측정하는 방법, 양자효율 측정 장치(Quantum Efficiency Measurement System)를 사용하여 태양광의 파장별로 분광반응도를 측정하는 양자효율측정법 등 다양한 방법이 있다. 그 중 양자효율측정법은 태양광의 다양한 파장에 대하여 태양전지가 파장대역마다 어떠한 반응을 하는지 알 수 있고, 그에 따른 태양전지에 사용된 재료의 특성을 알 수 있게 해준다. 일반적으로 양자효율측정은 태양광 아래에서의 상황과 유사한 환경을 만들기 위해 바이어스광을 사용하고, 분광기로 AC광원을 태양전지에 조사하여 측정한다. 바이어스광의 광량 및 AC광원의 주파수에 의해 양자효율 측정결과는 달라질 수 있는데, 이는 태양전지에 사용된 물질에 따라 다른 경향을 보인다. 본 연구에서는 바이어스광과 AC 광원 주파수를 특정한 광주파수대역(100 Hz ~ 1000 Hz)에서 단결정태양전지와 다결정태양전지에 조사하여 측정하였고, 양자효율 대한 영향과 그 결과에 따른 원인을 분석하였다.

• Journal of Wetlands Research
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• v.14 no.2
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• pp.237-242
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• 2012

In order to determine the ecological characteristics of Quercus serrata and Q. aliena, which are potential natural vegetation of riverine in Korea, we cultivated the seedlings of two oak species under light, soil moisture and nutrient gradients from April to October in glasshouse. Then, we measured aboveground, belowground and total plant biomass and analyzed the differences in growth between two oak species. The two oak species showed decreasing growth with lower light intensity, but reduction in growth of Q. aliena was greater than that of Q. serrata. Q. serrata and Q. aliena had a constant growth state under soil moisture gradients, but Q. aliena grew well more than Q. serrata in lower soil moisture gradient. As soil nutrient availability decreased, the growth of Q. aliena was greater than Q. serrata. These results mean that the growth of two oak species is not affected by soil moisture, but the part of growth in Q. serrata may be positively affected in lower soil moisture condition. Also, Q. serrata has strong shade tolerance and the ability to adapt high nutrient condition relative to Q. aliena. Thus, Q. serrata and Q. aliena will be advantageous for the growth in stream ecosystem due to high light availability, but Q. serrata will be distributed near the lowlands by the water environment. Also, because the two oak species need high soil nutrient, it is important to preserve herbaceous vegetation to prevent nutrients that flowed in the streams.

• Korean Journal of Environment and Ecology
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• v.30 no.5
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• pp.803-809
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• 2016

In order to elucidate the ecological responses of B. latissimum under global warming situation and prepare the conservation measures, we cultivated the plant within control(ambient $CO_2+$ambient temperature) and treatment(elevated $CO_2+$elevated temperature) from 2010 to 2011. Rising $CO_2$ concentration was treated with 2 times and temperature increased with $2.0^{\circ}C$ above than control. As a result, Growth response has received more the effect of $CO_2+$Temperature rising than light, moisture, nutrients, and it was grow well in $CO_2+$temperature rise sphere when many nutrients, and it was grow well in $CO_2+$temperature rise sphere when many nutrients. No. of leaves were many number in the treated group compared to the control at a low light gradient and high nutrient gradient, leaf width was narrow in the treatment compared to the control in the middle gradient of light and nutrients. Shoot length, petiole length, lamina length was no difference between control and $CO_2+$temperature rise sphere. Based on the results of this study, in order to preserve the B. latissimum in future climate, we should be supply of nutrients(containing ${NH_4}^+$, $NO_3$, $P_2O_5$, $K_2O$, etc.) in the habitat of the B. latissimum, and must ensure that the habitat of B. latissimum is not destroyed. Also, We should be find similar area with habitat of the B. latissimum, restoring, expanding.

• Journal of Bio-Environment Control
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• v.17 no.1
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• pp.51-59
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• 2008

Lettuce, a typical light-induced seed germination type, exhibits different germination responses according to cultivars, light quality, and plant growth regulator (PGR) treatments. Germination rates in most tested cultivars were over 85% under both white and red light, and were slightly decreased by blue light. Although photo-inhibition in germination was observed from most cultivars by far-red light, 'Cheongguangcheongchima', 'Okdol', and 'Manchudaecheongchima' could be classified as photo-insensitive lettuce cultivars by exhibiting the germination rates as 78,63, and 48% under for-red light, respectively. 6-Benzylamino purine (BAP) and kinetin promoted seed germination and normal seedling production under far-red light, but ethephon did not show any positive effects. Cytokinins such as BAP, kinetin, thidiazuron (TDZ), and zeatin overcame photo-inhibition of seed germination even the concentration of below $50\;mg{\cdot}L^{-1}$. However, auxins such as IBA, 2,4-D, and NAA failed to overcome the far-red light-induced photo-inhibition.

• Journal of Korean Society of Environmental Engineers
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• v.31 no.11
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• pp.1019-1024
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• 2009

Visible-light-active $TiO_2-_xN_x$ nanoparticles with a homogeneous anatase crystalline structure were successfully prepared through a hydrolysis of $TiCl_4$ with ammonia solution. The samples were characterized by X-ray diffraction (XRD), Transmission electron microscopy (TEM), $N_2$-sorption, and UV-vis diffuse reflectance spectra (DRS) techniques. The light absorption onset shifted from 390 nm on pure $TiO_2$ to the visible region at 530 nm on nitrogen-doped $TiO_2$. A clear decrease in the band gap was deduced from the DRS results. The photocatalytic activity was evaluated from the photodegradation of congo red solution under visible light irradiation. The photocatalyst showed the highest photocatalytic activity at an optimal value of nitrogen doping concentration. This was suggested that the nitrogen doping should have an important effects on the improvement of photocatalytic activity.

• Korean Journal of Environment and Ecology
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• v.29 no.4
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• pp.564-569
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• 2015

In order to discover materials that can be used for OLED, extractions of marine microalgae was screened for photoluminescence(PL) properties and analyzed using gas chromatography-mass spectrometry(GC-MS). The extractions of Nitzschia denticula, Navicula cancellata and Nannochloropsis salina showed PL spectroscopy among fourteen marine microalgae species. The selected three fractions from three microalgae were analyzed by GC-MS. According to the results, it was found that the identified organic light-emitting materials can be subdivided into three functional groups based on imidazole, purine and quinoline. These chemicals are considered to have a strong relationship with PL spectroscopy for OLED materials.

• 월간 기계설비
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• s.238
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• pp.36-46
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• 2010

에너지 다소비 시설인 하수처리시설이 녹색기술을 도입해 에너지 사용량은 줄이고 청정에너지를 생산하는 에너지 독립시설로 탈바꿈한다. 환경부는 최근 하수처리시설에 고효율 에너지 설비 재생에너지이용 설비 등을 설치해 2030년까지 3단계에 걸쳐 에너지자립을 50% 달성 등의 내용을 골자로 하는 '하수처리시설 에너지자립화 기본계획'을 확정 발표했다. 환경부에 따르면 하수처리시설은 하수처리 과정에서 소화가스, 소수력, 하수열 등을 이용할 수 있을 뿐만 아니라 하수처리시설물의 넓은 부지를 활용한 태양광 풍력발전이 가능하다는 것. 이에 따라 환경부는 올해부터 소화가스, 소수력발전, 에너지절감 설비, 태양광 풍력발전설비를 도입해 에너지 자립율을 2015년 18%에 이어 2020년 30%, 2030년 50%까지 끌어올린다는 방침이다.

• 월간 기계설비
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• s.239
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• pp.52-60
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• 2010

에너지 다소비 시설인 하수처리시설이 녹색기술을 도입해 에너지 사용량은 줄이고 청정에너지를 생산하는 에너지 독립시설로 탈바꿈한다. 환경부는 최근 하수처리시설에 고효율 에너지 설비 재생에너지이용 설비 등을 설치해 2030년까지 3단계에 걸쳐 에너지자립율 50% 달성 등의 내용을 골자로 하는 '하수처리시설 에너지자립화 기본계획'을 확정 발표했다. 환경부에 따르면 하수처리시설은 하수처리 과정에서 소화가스, 소수력, 하수열 등을 이용할 수 있을 뿐만아니라 하수처리시설물의 넓은 부지를 활용한 태양광 풍력발전이 가능하다는 것. 이에 따라 환경부는 올해부터 소화가스, 소수력발전, 에너지절감 설비, 태양광 풍력발전설비를 도입해 에너지 자립율을 2015년 18%에 이어 2020년 30%, 2030년 50%까지 끌어올린다는 방침이다. 본지는 지난호에 이어 이번호를 끝으로 연재를 마친다.

• Korean Journal of Environmental Agriculture
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• v.38 no.1
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• pp.61-67
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• 2019

BACKGROUND: Many studies on artificial lighting have been recently performed to investigate its effect on agricultural products with good quality. This review was aimed at comparing the effects of artificial light on functional metabolites of the plants that were grown in greenhouses and growth chamber. METHODS AND RESULTS: It has been summarized that artificial lighting both in growth chambers and greenhouses caused different functional metabolites patterns depending on light quality. Even though the same light quality was applied, different patterns in metabolites were observed in different plant species. For the same species, supplementation of the same light quality in both growth chambers and greenhouses did cause different functional metabolites patterns. CONCLUSION: Artificial lighting caused different patterns in functional metabolites of plants grown in greenhouses and growth chambers, depending on the light quality and/or plant species. The manipulation of plant growth and functional metabolites would be possible by engineering the light qualities, but knowledge on proper lighting condition depending on plant species and growth places would be necessary.