• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2001년도 추계학술대회 논문집
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• pp.505-508
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• 2001

Currently there is much interested in removing latent charge that is caused to latent image effect and blurring of obtained image as well as reduction of x-ray conversion efficiency in digital radiography system. To remove latent charge a-Se film is irradiated by light with 3500 lux using halogen lamp and optical fiber. We measured dark current and photosensitivity to analyze removing effect of latent charge, then compared with and without light erasing method. The reduction of measured signal due to latent charge effect was 32.3%, and the removal effect of latent charge by using light erase method was its 95.5%.

• 한국버섯학회지
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• 제8권4호
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• pp.137-141
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• 2010

1. 광 종류별 조도는 백색광은 2,270Lux로 가장 밝았으며, 황색광 1,750Lux, 청색광 460Lux, 적색광 400Lux의 순이었다. 2. 자실체 특성을 조사한 결과, CBM-1757이 느티만가닥버섯에 비하여 갓의 크기와 대직경이 양호한 경향이었으며, 광 종류간에는 황색광에서 다른 광에 비하여 다소 좋은 경향이었다. 3. 생육기간은 CBM-1757이 느티만가닥버섯에 비하여 균 배양일수는 2일, 초발이소요일수는 1일, 생육일수는 1일정도 단축되어 생육기간이 8일 정도 빠른 경향이었다. 광종류간에는 황색광에서 생육기간이 70일 소요되어 다른 광에 비하여 2~4일 정도 단축되는 경향이었다. 4. 유효경수 및 개체중은 품종간에 차이가 나지 않는 경향이었고, 병당 수량은 느티만가닥버섯 94.8g에 비하여 CBM-1757은 95.6g으로 약간 많았다. 광 종류간에는 백색광의 96.0g에 비하여 청색광 및 적색광에서는 2~9%가 감소되었으나, 황색광에서는 103.4g으로 8% 정도 증수되는 경향이었다. 5. 버섯의 색도는 CBM-1757이 느티만가닥버섯에 비하여 명도, 적색도 및 황색도가 높았으며, 광 종류간에는 황색광에서 다른 광에 비하여 다소 높은 경향이었다.

• 치위생과학회지
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• 제19권2호
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• pp.133-140
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• 2019

Background: The light-emitting diode (LED) curing light used is presumed to be safe. However, the scientific basis for this is unclear, and the safety of LED curing light is still controversial. The purpose of this study was to investigate the effect of LED curing light irradiation according to the conditions applied for the polymerization of composite resins in dental clinic on the cell viability and inflammatory response in Raw264.7 macrophages and to confirm the stability of LED curing light. Methods: Cell viability and cell morphology of Raw264.7 macrophages treated with 100 ng/ml of lipopolysaccharide (LPS) or/and LED curing light with a wavelength of 440~490 nm for 20 seconds were confirmed by methylthiazolydiphenyl-tetrazolium bromide assay and microscopic observation. The production of nitric oxide (NO) and prostaglandin $E_2$ ($PGE_2$) was confirmed by NO assay and $PGE_2$ enzyme-linked immunosorbent assay kit. Expression of interleukin $(IL)-1{\beta}$ and tumor necrosis factor $(TNF)-{\alpha}$ in total RNA and protein was confirmed by reverse transcription polymerase chain reaction and Western blot analysis. Results: The LED curing light did not affect the viability and morphology of normal Raw264.7 cells but affected the cell viability and induced cytotoxicity in the inflammation-induced Raw264.7 cells by LPS. The irradiation of the LED curing light did not progress to the inflammatory state in the inflammation-induced Raw264.7 macrophage. However, LED curing light irradiation in normal Raw264.7 cells induced an increase in NO and $PGE_2$ production and mRNA and protein expression of $(IL)-1{\beta}$ and $(TNF)-{\alpha}$, indicating that it is possible to induce the inflammatory state. Conclusion: The irradiation of LED curing light in RAW264.7 macrophage may induce an excessive inflammatory reaction and damage oral tissues. Therefore, it is necessary to limit the long-term irradiation which is inappropriate when applying LED curing light in a dental clinic.

• 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.

• Journal of Astronomy and Space Sciences
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• 제9권2호
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• pp.154-164
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• 1992

The Mg II lines been extracted from the IUE archival spectra of 32 Cygni to investigate the effect of the atmospheric eclipse. The UV light curve has been reduced from the continuum flux at the center wavelength of 2807.5 ${\AA}$ in the IUE spectra. The equivalent width of the Mg II k absoption line has been measured for each spectra. The results of the light variation and flux tracing of the absorption line at the vicinity of the primary eclipse confirmed the atmospheric eclipse. The atmospheric effect lasted until the phase 0.06 in the absorptin line tracing, while it lasted until the phase 0.02 in the UV light curve, respectively.

• 생명과학회지
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• 제6권3호
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• pp.193-197
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• 1996

The action spectrum for mycelial growth and fruitbody primordium formation in Pleurotus ostreatus has been studied by irradiation at various wavelengths. Effective wavelengths. Effective wavelengths were distributed from near ultraviolet to blue region of spectrum. The most effect of light was observed in the region between 340 to 500 nanometers. The light intensity required to obtain of the maximum effect at the most effective wavelengths(430-500nm), was over 6.8 mW/Cm$^{2}$. Up to 6.8 mW/Cm$^{2}$, the primordium formed about 25 hr after the start of illumination. The higher the light intensity, the earlier the formation of the primordium formation : Up to about 6.8 mW/Cm$^{2}$.

• Asian-Australasian Journal of Animal Sciences
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• 제29권11호
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• pp.1562-1568
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• 2016

Monochromatic green light-emitting diodes (LED) light stimuli influences the posthatch growth performance of chicks. This study was undertaken with the following objectives: i) to examine whether the green LED light stimuli induces an overheating effect by determining weight loss rate of fertile eggs during incubation period; ii) to look for the development of eyes and other primary organs at different ages of embryos and newly hatched chicks. Arbor Acres fertile broiler eggs (n = 480) were randomly assigned to 3 incubation groups and exposed to continuous white light, green light, or a dark environment (control) from the first day to 19 d of incubation. The light sourced from LED lamps with the intensity of 30 lx at eggshell level. The results showed that either green or white light stimuli during incubation did not significantly affect the weight loss rate of fertile eggs, hatching time, hatchability, chick embryo, or body weight (BW), the weight percentage of heart, liver, and eyes, as well as obvious systematic abnormalities in eye weight, side-to-side, back-to-front, or corneal diameter from 15 d of embryogenesis to 6 d of posthatch (p>0.05). Compared with the dark condition, green light stimuli during incubation tended to increase feed intake (p = 0.080), improved the BW gain of chicks during 0 to 6 day posthatch (p<0.05), and increased the percentage of pectoral muscle to the BW on 3- and 6-day-old chicks. In addition, embryos or chicks in green light had lower weight percentage of yolk retention on 19 d of embryogenesis and 1 d of posthatch in comparison to those in dark or white group (p<0.05). These results suggest that providing 30 lx green LED light stimuli during incubation has no detrimental effect on the development of eyes, heart and liver of embryos and hatchlings, but does have potential benefits in terms of enhancement of the chick growth during the early posthatch stages. In addition, the fertile broiler eggs stimulated with 30 lx green LED light during incubation does not cause an overheating effect.

• 한국전기전자재료학회논문지
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• 제21권8호
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• pp.760-765
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• 2008

Low power laser therapy is internationally certified and is known to be effective in stimulating DNA in living organisms, increasing protein synthesis and activating cell division, smoothing blood circulation, promoting cell activation, cell regeneration and function. It also has anti-inflammatory, anti-edemic, anti-fibrous dysplastic and neuralogic hyperfunctional effects. This study was intended to verify the effect of LED irradiation therapy on wound healing in cell and animal tests by applying LED irradiator using a laser and laser diode, which was independently designed and developed to emit beams of similar wavelength to that of a laser. This equipment was fabricated using a micro-controller and a high brightness LED, and designed to enable us to control light irradiation time, intensity and reservation. In case of cell proliferation experiment, each experiment was performed to irradiation group and non-irradiation group for tissue cells. MTT assay method was chosen to verify the cell increase of two groups and the effect of irradiation on cell proliferation was examined by measuring 590 nm transmittance of micro-plate reader. In the wound healing experiment, 1$cm^2$ wounds on the skin wound of SD-Rat(Sprague-Dawley Rat) were made. Light irradiation group and none light irradiation group divided, each group was irradiated one hour a day for 9 days. As a result, the cell increase of tissue cells was verified in irradiation group as compared to non-irradiation group. And, compared with none light irradiation group, the lower incidence of inflammation and faster recovery was shown in light irradiation group.

• 한국환경과학회지
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• 제3권2호
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• pp.141-155
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• 1994

담배(Nicotiana tabacum)와 까마중(Solanum migrum)의 솩간 원형질체 융합으로 유도된 켈러스를 재료로하여 캘러스의 전체 단백젤과 틸라코이드막 단백질의 양태변화를 중심으로 식물생장 조절물질과 단색광의 생리적 상호효과를 조사하였다. 여러 단색 광선을 캘러스에 조사하였을때, 적색 및 청색광이 캘러스의 전체 단백질과 킬라코이드막 단백질의 합성을 촉진하였으며 , NAA+$ extrm{GA}_3$ 와 NAA+BA의 조합구에서 캘러스의 전체 단백질과 틸라코이드막 댄백질의 축척이 활발히 일어났으며, NAA+$ extrm{GA}_3$처리구에서 더욱 효과적 이였다. NAA+$ extrm{GA}_3$ 처리구에 청색광, 적색광 및 근적외광을 제각각 처리하였을때 캘러스의 전체 단백질과 킬라코이드막 단백질의 합성은 적색광에 의하여 가장 촉진되었다. 따라서 적색광과 NAA+$ extrm{GA}_3$구의 동시처리가 캘러스의 전체 단백질 및 킬라코이드막 단백질의 합성을 상승적으로 촉진함을 보였다.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
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• 제29권3호
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• pp.29-36
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• 2023

Purpose: The purpose of this study is to find out whether the color change of the LED light source has a significant effect on the beta wave activity of EEG in the learning state. Methods: The subjects of the experiment were 20 male and female college students between the ages of 19 and 25 who routinely perform their studies. In the created learning environment, the EEG change according to the change in the lighting color was measured while solving the Mensa thinking ability problem while sitting on a desk with LED lights installed on the top and a chair with a footrest to stabilize the legs. The light source consisted of 3 ready-made colors and 6 newly created colors. A total of 9 color light stimuli were given for 2 minutes each, and the EEG change of the subject was observed. After the experiment, the correlation was analyzed based on the mid-beta wave data recorded on the QEEG according to the color change of light and the Mensa problem score. Results: It was found that the activation of mid-beta waves was stimulated in the temporal lobes (T5, T3, T6, T4) and occipital lobes (O1, O2) of all subjects who focused on solving Mensa thinking problems. As a result of comparing the top 20% and the bottom 20% of problem solving scores, the upper group had no effect of lighting, while the lower group showed increased beta wave activity in response to color light stimulation in the order of T4, T6, and T5. Implications: It was confirmed that the color of light that activates the middle beta wave varies greatly depending on the subject's attention and learning ability, and it is judged that the color of light including the green wavelength is helpful in activating the middle beta wave in the group with low learning ability.