• Journal of Ginseng Research
• /
• 제15권1호
• /
• pp.21-30
• /
• 1991

This study was conducted to know the elects of light intensity of polyethylene net shading on the growth status, photosynthesis and root yield of ginseng plants. Polyethylene net shading of loft transmittance was the best one among light intensities of polyethylene net used in view of photosynthesis and decreasing of early leaf defoliation. According to increase of light intensity under the shading chlorophyll contents of ginseng leaves were decreased. As it was increased over 2 mg/g Photosynthesis and total saponin of leaves showed on the decrease remarkably. The rate of alternaria blight of ginseng plants showed the positive correlation between light intensity and leaking rate. The shading of 10% transmittance in root yield was increased by 40% in 6-year-old ginseng plant as compared with common straw shading, due to decreased missing plant and increased root weight.

• 한국진공학회:학술대회논문집
• /
• 한국진공학회 2013년도 제45회 하계 정기학술대회 초록집
• /
• pp.286.1-286.1
• /
• 2013

Nowadays, the glare towards the light-emitting diode (LED) lighting source has much attention due to its eco-friendly nature, reduced energy consumption, and low CO2 emission. LEDs can show versatile colors by changing the composition ratio of semiconductors. Phosphors re-emit light by absorbing light from LED, which is the key factor for emission. The endeavor to make replica of natural white light is increasing day by day. Industrially, blue LED chip crowned with a yellow phosphor coated lens gives low quality white light. Newly, many researchers are introducing modern approaches, adding red phosphor to the yellow phosphor to increase the quality of white light. Here, we synthesized structurally and chemically stable europium doped oxyapatite Ca8Gd2(PO4)6O2 nano-crystalline structures by a hydrothermal method. The ultrafine structures were formed due to the effect of ethylenediaminetetraacetic acid, which is confirmed by the transmission electron microscope images. The structural properties were analyzed using the X-ray diffraction patterns.

• 방송공학회논문지
• /
• 제21권4호
• /
• pp.538-551
• /
• 2016

방송 제작현장에서는 영상 이미지 표현의 광원으로 Tungsten Halogen 광원이 주 광원으로 사용 되어 왔다. Tungsten Halogen 광원은 그동안 개발된 다른 광원보다 태양광원과 유사한 색 재현성으로 각광받아 왔지만 에너지 효율성의 문제점을 가지고 있었다. 최근 대체 광원으로 고효율의 에너지와 긴 수명의 LED광원이 방송 광원으로 주목받기 시작했다. LED광원은 독특한 발광원리 때문에 카메라를 통한 영상 이미지의 색 재현성과 광원에서 투사되는 빛의 질에 있어서 Tungsten Halogen광원과 다른 특성을 가지고 있다. 이런 특성은 LED광원이 방송 광원으로서 도입이 늦어지는 이유이다. 이에 본 연구에서는 LED 광원의 색 재현성과 빛의 질 특성인 평탄도를 측정하여 기준광원인 Tungsten Halogen과 비교하여 방송 광원으로써의 적합성에 대한 실험 데이터를 제시할 것이다. 또한 LED광원이 방송 광원으로서의 확산되기 위해서 필요한 점이 무엇인지 향후 과제와 기준을 제시하고자 한다.

• 한국환경농학회지
• /
• 제3권1호
• /
• pp.71-78
• /
• 1984

약 500nm 이하의 파장영역(청색광)이 차단된 태양광은 고추의 생장에 괄목할만한 효과를 보였다. 영양생장기의 여러가지 생장지표들은 전반적으로 생육상태가 향상 내지 촉진되고 있음을 보여주었다. 한편, chlorophyll a, ${\beta}-carotene$, 및 다섯가지 성분의 xanthophyll을 주성분으로 하는 것으로 밟혀진 고추의 광합성색소계의 수준은 광질처리구의 잎에서 백색광 대조구에 비하여 높게 나타났다. 특히 carotenoid들의 함량증가가 보다 현저하였다. 광질 처리효과로 생긴 왕성한 생장력은 숙과의 수량형성에도 반영되어 대조구대비 35%의 증수를 보였다. 또한 청색광을 차단한 광질처리가 식품으로서의 숙과의 품질들 저하시키는 일이 없음도 아울러 확인하였다. 본 연구에 사용한 광질을 선택한 논리적 근거와 실험결과들을 여러 가지 광생물학적 측면에서 토의하였다.

• 생명과학회지
• /
• 제13권1호
• /
• pp.15-20
• /
• 2003

발아율을 높이기 위하여 처리된 종자는 판매를 위하여 건조되어야만 한다. 본 연구는 파종전 처리된 박 종자의 발아율을 최상으로 유지하기 위한 건조방법을 강구하고자 용자대목과 궁합을 공시재료로 건조방법, 건조 및 발아 과정에서 처리되는 광질과 온도가 발아에 미치는 영향을 조사하기 위하여 수행되었던 바 그 결과를 요약하면 다음과 같다. 1) 종자처리가 이루어진 박 종자는 $35^{\circ}C$에서 10시간 건조할 경우 처리 직전의 수분함량에 도달하였으며 건열 소독된 종자와 발아율에서는 차이가 없었다. 2) 파종전 처리된 박 종자는 암상태에서 건조하는 것보다는 적색광을 조사하면서 건조할 경우 초기발아율이 높았으며 적색광의 처리효과는 3개월 이상 지속되는 것으로 나타났다. 3) 적색광을 처리하면서 건조된 박 종자의 발아율은 발아과정에서 초적색광 처리로 현저히 억제된 반면, 적색광 또는 암상태에서는 치상 후 2일까지의 초기발아율이 높은 것으로 나타났다. 4) 암상태보다는 적색광 처리를 통하여 건조된 박 종자의 발아율은 발아온도 10 또는 $20^{\circ}C$에 비하여 고온인 3$0^{\circ}C$에서 높은 것으로 조사되었다.

• 유통과학연구
• /
• 제13권9호
• /
• pp.19-27
• /
• 2015

Purpose - In a global economy, marketers are required to understand service quality from an international consumer viewpoint. Despite the increased need for cross-cultural research, few studies have developed service quality research international in scope. The present research aims to shed light on variations in airline service quality among international consumers. Research design, data, and methodology - Conducting crosscultural research, this study compares airline service quality variations, investigating an international consumer group and a Korean consumer group. T-test and factor analyses are applied to examine mean scores and factor structure of the airline service dimensions. Results - The results indicate there are significant differences in mean comparisons between the groups. The international consumers indicate significantly higher service perception scores than the Koreans. Further, we find that the factor structure of airline service quality diverges between the groups. The international group considers airline service quality in four dimensions, while Koreans consider it in two. Conclusions - The study sheds new light on international service variations and suggests that the field of airline service quality may differ by nations and/or cultures.

• 생명과학회지
• /
• 제11권2호
• /
• pp.166-172
• /
• 2001

Various types of the seeding of bottle gourd widely used as a rootstock of watermelon has been required to satisfy the farmers need. The study was done to determine the effect of light quality of blue, red and far-red lights treated with light emitting diodes on growth and morphology of bottle goured seeding and chlorophyll content of its cotyledons. The lights were treated in the growth chamber for 7 days to the seeding elapsed 8 days after sowing under natural condition, and 64 hole trays with commercial bedsoil. Plant height, length and diameter of hypocotyl, leaf area of cotyledon and first true leaf, its leaf length, number of true leaves, fraction and total dry weight were measured. Red light shortened and slenderized the hypocotyl, which lengthened by far-red light and thickened by blue light. Plant height was declined in order of far-red light treatment, blue and red lights mainly due to difference of hypocotyl length, Area and length of the first true leaf became smaller and shorter under far-red light than under the other lights. However, blue light increased leaf area of cotyledons. Two cultivars cv. Yongjadaemok and cv. Kunghap had different response to the light treatments in total seedling dry weight(dw); far-red and red light treatments showed the greatest and the least dw of hypocotyl, respectively, while blue and red lights did the greatest dw of the other organs. Among the ratio of each organ dw to total dw, those of hypocotyl and true leaves were different between the light treatments; the highest ratio of hypocotyl dw to total dw was observed in far-red light treatment but the lowest was in red light treatment. Those of the true leaves were the lowest in far-red light and similar response in blue or red light treatment. Chlorophyll content of cotyledons was decreased in order of red light treatment, blue and far-red lights, meaning that short period light treatment may influence photosynthesis of seeding and afterward its growth.

• 한국작물학회지
• /
• 제34권1호
• /
• pp.40-47
• /
• 1989

오리엔트종 연초에서 생육 후기 조도와, 인공기상실에서의 생육 온도를 달리하여 각각 잎담배의 화학성분과 품질과의 관계를 분석한 결과, 1. 조도가 낮을수록 잎담배의 품질이 낮고, 수확엽의 엽록소함량이 높으나 단위엽면적량이 낮았으며, 2. 당, 석유에텔 추출물 및 휘발성 유기산함량이 낮고, 전질소, 니코틴, 회분, pH는 높았으며 ester 화함물은 조도가 높은 구에서 neophytadiened은 조도가 낮을수록 함량이 높았다. 3. 생육 온도가 2$0^{\circ}C$, $25^{\circ}C$, 3$0^{\circ}C$로 높을수록 개화일수가 짧고 생육이 저하되었으며, 품질은 큰 차이를 보이지 않았다. 4. 생육 온도가 높을수록 질소화합물, 회분함량, pH가 높은 당합량이 낮았으나, 석유에텔 추출물, 휘발성 유기산 및 적유성분 중성부 함량은 큰 차이가 없었다. 5. 생육중 일조와 온도가 다른 환경의 잎담배 품질평가에 공통적으로 적용이 가능한 지수로는 I-IV, IX 및 X이 추천된다.

• Asian-Australasian Journal of Animal Sciences
• /
• 제33권7호
• /
• pp.1180-1190
• /
• 2020

Objective: To develop healthier comminuted meat products to meet consumer demand, the gel properties, rheological properties, microstructure and water distribution of pork meat batters formulated with various amounts of bamboo shoot dietary fiber (BSDF) were investigated. Methods: Different levels of BSDF (0% to 4%) were added to pork batters, and the pH, color, water-holding capacity, texture and rheological properties of pork batters were determined. Then, pork batters were analyzed for their microstructure and water distribution using scanning electron microscopy (SEM) and low-field nuclear magnetic resonance (LF-NMR). Results: Compared with the control, BSDF addition into meat batters showed a significant reduction in L^*-value and a significant increase in b^*-value (p<0.05). BSDF addition of up to 4% reduced the pH value of pork batters by approximately 0.15 units; however, the cooking loss and expressible water loss decreased significantly (p<0.05) with the increased addition of BSDF. The hardness and gel strength were noticeably enhanced (p<0.05) as the content of BSDF increased. The rheological results showed that BSDF added into pork batters produced higher storage modulus (G') and loss modulus (G") values. The SEM images suggested that the addition of BSDF could promote pork batters to form a more uniform and compact microstructure. The proportion of immobilized water increased significantly (p<0.05), while the population of free water was decreased (p<0.05), indicating that BSDF improved the water-holding capability of pork batters by decreasing the fraction of free water. Conclusion: BSDF could improve the gel properties, rheological properties and water distribution of pork meat batters and decrease the proportion of free water, suggesting that BSDF has great potential as an effective binder in comminuted meat products.

• 한국물환경학회지
• /
• 제34권6호
• /
• pp.632-641
• /
• 2018

Algal dynamics is controlled by multiple environmental factors such as flow dynamics, water temperature, trophic level, and irradiance. Underwater irradiance penetrating from the atmosphere is exponentially decreased in water column due to absorption and scattering by water molecule and suspended particles including phytoplankton. As the exponential decrease in underwater irradiance affects algal photosynthesis, regulating their spatial distribution, it is critical to understand the light extinction characteristics to find out the mechanisms of algal dynamics more systematically. Despite the significance, the recent data have been rarely reported in the main stream areas of large rivers, Korea. In this study, the euphotic depths and light extinction coefficients were determined by monitoring the vertical variation of underwater irradiance and water quality in the main channel of Nakdong River near Dodong Seowon once a week during summer of 2016. The average values of euphotic depth and light extinction coefficient were 4.0 m and $1.3m^{-1}$, respectively. The degree of light extinction increased in turbid water due to flooding, causing an approximate 50 % decrease in euphotic depth. Also, the impact was greater than the self-shading effect during the periods of cyanobacterial bloom. The individual light extinction coefficients for background, total suspended solid and algal levels, frequently used in surface water quality modeling, were determined as $0.305m^{-1}$, $0.090m^{-1}/mg{\cdot}L^{-1}$, $0.013m^{-1}/{\mu}g{\cdot}L^{-1}$, respectively. The values estimated in this study were within or close to the ranges reported in literatures.