• 한국멀티미디어학회논문지
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• 제20권11호
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• pp.1729-1740
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• 2017

This paper describes a vision-based method that effectively recognize a traffic light. The method consists of two steps of traffic light detection and discrimination. Many related studies have used color information to detect traffic light, but color information is not robust to the varying illumination environment. This paper proposes a new method of traffic light detection based on intensity and saturation. When a traffic light is turned on, the light region usually shows values with high saturation and high intensity. However, when the light region is oversaturated, the region shows values of low saturation and high intensity. So this study proposes a method to be able to detect a traffic light under these conditions. After detecting a traffic light, it estimates the size of the body region including the traffic light and extracts the body region. The body region is compared with five models which represent specific traffic signals, then the region is discriminated as one of the five models or rejected as none of them. Experimental results show the performance of traffic light detection reporting the precision of 97.2%, the recall of 95.8%, and correct recognition rate of 94.3%. These results shows that the proposed method is effective.

• 한국근적외분광분석학회:학술대회논문집
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• 한국근적외분광분석학회 2001년도 NIR-2001
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• pp.1128-1128
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• 2001

We have developed a probe for measuring the light levels inside illuminated fruit. The probe has minimal effect on the light levels being measured and enables the sampling of the light flux at any point within the fruit. We present experimental light extinction rates within apple, nashi, kiwifruit, and mandarin fruit. Moving from the illuminated side to the far side of the fruit, the extinction level follows an initial power law decay as the light diffuses into the fruit then reduces to an exponential decay through the rest of the fruit. Significant variations in the rates of light extinction are found in the core, skin and differing flesh regions. Monte Carlo simulations of the light distribution in fruit, which use scattering and absorption coefficients for the diffusely scattering tissue, and boundary conditions for the skin effects, produce results that follow the experimental results closely.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 가을 학술발표회 논문집
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• pp.413-416
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• 2003

Experimental tests on the high strength self-compacting concrete with light-weight fine aggregate and light-weight coarse aggregate(LHSSC) were performed with slump-flow, reaching time to the slump-flow of 500mm, V-funnel dropping time and U-box difference level and compressive strength. LHSCC with light-weight fine aggregate of 75% and light-weight coarse aggregate of 100% was only satisfied with the property conditions of second self-compacting concrete(SCC), like as flowability, resistance to segregation and filling ability. The 28-day compressive strength of LHSCC indicated above 300kgf/$\textrm{cm}^2$ in all concrete mixtures, and it was increased to increase the replacement ratio of light-weight fine aggregate or to decrease the replacement ratio of light-weight coarse aggregate. Therefore, for satisfying the properties of fresh SCC and hardened concrete with above 350kgf/$\textrm{cm}^2$, it would expected that the replacement ratio of light-weight fine aggregate and light-weight coarse aggregate will be determined with 50~75% and 25~50%, respectively.

• KSBB Journal
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• 제6권2호
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• pp.189-194
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• 1991

The effect of wtlitc light on unaeraten growth of Baker's yeast and the accompanying ethanol production has been studied in a batch process at 27$^{\circ}C$. Over the 80-hour period of the Champagne yeast process without pH control, the cull growth was inhibited by the fluorescent light. Another observed difference between the runs is that the drop and subsequent rise in redox potential occurred much sooner in the fermentation with light than in the fermentation without light. This preliminary study indicated that ethanol production could be enhanced by light as the cell concentration is repressed. The possible pathway, shift of the sugar substrate toward ethanol and away from cells was manifested by another difference as well. As observed under the microscope, many of the yeast cells grown under light budded without dividing by the normal fission process as they did in the dark. Furthermore, the undivided and branched (light grown) cell did not agglutinate at the end of the fermentation process as did the distinct spherical (dark grown) cells.

• 한국멀티미디어학회논문지
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• 제21권11호
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• pp.1244-1253
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• 2018

The color of traffic light is sensitive to various illumination conditions. Especially it loses the hue information when oversaturation happens on the lighting area. This paper proposes a traffic light recognition method robust to these illumination variations. The method consists of two steps of traffic light detection and recognition. It just uses the intensity and saturation in the first step of traffic light detection. It delays the use of hue information until it reaches to the second step of recognizing the signal of traffic light. We utilized a deep learning technique in the second step. We designed a deep convolutional neural network(DCNN) which is composed of three convolutional networks and two fully connected networks. 12 video clips were used to evaluate the performance of the proposed method. Experimental results show the performance of traffic light detection reporting the precision of 93.9%, the recall of 91.6%, and the recognition accuracy of 89.4%. Considering that the maximum distance between the camera and traffic lights is 70m, the results shows that the proposed method is effective.

• 한국기계가공학회지
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• 제11권6호
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• pp.175-182
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• 2012

Light characteristics of the monochromatic red(R), blue(B), green(G) and white(W) and the mixed LED (B-R LED) were investigated by light control a Spectrometer-MMS1 and an illuminometer. The power consumption of each LED was 1W and R LED has five wavelength bands(600nm, 640nm, 660nm, 680nm, 750nm). The light intensity of each LED was changed in a range 10~100%. As a results, the wavelength and the spectrum distribution of R LED increase with increasing light intensity but the wavelength of B, G, W LED decreases. It was found that illumination of each mononochromatic and B-R LED increases linearly with increasing light intensity. It was confirmed that the illumination intensity of R-B light has greater values than those obtained by monochromatic light at the same conditions.

• 생물환경조절학회지
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• 제30권3호
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• pp.218-229
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• 2021

최근, 소비자들이 건강관리에 대한 관심과 중요도가 높아짐에 따라 화학적인 농약을 사용하지 않은 유기농 천연 식품을 선호하게 되었다. 새싹 채소는 건강증진과 암, 심혈관질환 등의 질병을 예방하는 효과가 있어, 고기능성이고 안전한 식품인 새싹 채소의 소비가 크게 증가하고 있는 추세이다. 이 연구의 목적은 여러가지 새싹 채소 7종의 생육 그리고 생리활성 물질 함량에 대한 광의 영향을 조사하는 것이다. 새싹 채소용 케일, 다채, 브로콜리, 적양배추, 알팔파, 홍빛 열무 그리고 무 종자를 파종한 뒤 새싹들을 광조건(20℃, RGB 6:1:3, 130μmol·m^-2·s^-1, 12시간 광주기), 암조건 아래에서 각각 7일간 재배하였다. 처리 후 4일째부터7일째까지 1일 간격으로 샘플을 채취하였고 생체중과 건물중, 초장, 총페놀 함량, 항산화도를 측정하였다. Brassica 종(케일, 다채, 브로콜리, 적양배추)과 Medicago 종(알팔파)은 암조건에서 생체중 값이 유의적으로 높았지만 생리활성 물질 함량은 광조건에서 유의적으로 증대되었다. 이에 반해 Raphanus 속(홍빛 열무, 무)는 광조건에서 생체중이 유의적으로 증대되었지만 생리활성 물질 함량은 암조건에서 유의적으로 높은 값을 나타내었다. 다양한 새싹 채소의 생육과 생리활성 물질 함량 사이에서 음의 상관관계가 관찰되었다. 본 연구는 다양한 새싹 채소의 생육 및 영양학적 가치에 대한 광의 영향을 확인하였고 고품질의 새싹 채소를 생산하는데 있어 수확시기의 중요성을 강조한다.

• 한국습지학회지
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• 제25권3호
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• pp.196-204
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• 2023

섬오갈피나무는 산림청 지정 희귀식물로 곶자왈에서 자생하는 낙엽활엽관목식물이다. 본 연구는 섬오갈피나무의 광, 수분, 유기물에 따른 생육 반응 분석과 생태 지위폭을 측정하고, 이러한 결과를 바탕으로 적합한 환경조건을 찾고자 시도되었다. 섬오갈피나무는 광량이 아주 많거나 적은 조건이 아닌 중간 조건(L3, 자연광의 50%)에서 지상부 길이, 엽면적, 식물체 잎 무게가 증가하였다. 수분 구배와 유기물 구배는 잎 수와 식물체 잎 무게에 대한 생육 차이가 있었으며 수분 구배에서는 중간 조건(M3, 240ml) 이하에서 생육이 좋았으며 유기물 구배에서는 중간 조건(N3, 12%) 이상에서 생육 반응이 좋았다. 또한 생태 지위폭은 수분(0.977) > 유기물함량(0.964) > 광(0.951) 순으로 나타났다. 이러한 결과는 섬오갈피나무가 선호하는 서식지는 다소 그늘지고 약간 건조하며 토양의 양분이 많은 곳이며, 생육에 가장 큰 영향을 주는 환경요인은 광량임을 뜻하는 것으로 자생지의 서식지 관리에 우선적 고려 사항이라 판단된다.

• Asian-Australasian Journal of Animal Sciences
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• 제10권6호
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• pp.657-664
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• 1997

432 Babcock ISA white leghorn pullets reared for 8 weeks on a standard managemental conditions were exposed to feed/nutrient and light restrictions from 9 to 20 weeks of age. Four feeding regimes i. e. 100, 85 or 70 percent of the recommended allowance and low energy (2,500 Kcal/kg) low protein (13% CP) ration were fed each in the three light regimes i. e. (A) Natural day light starting from 13.24 hr/day at 8 weeks of age and ending 10.41 hr/day at the end of 20 weeks; (B) Constant 11 hr/day light and (C) starting with 13 hr/day at 8 weeks and decreasing @ 20 min/week till 20 weeks of age. At the age of 20 weeks all the birds were shifted to separate cages under uniform lighting feeding and management. During the 21st week light was increased to 12 hr a day and thereafter with an increase of 30 min per week, increased to 16 hr a day at the age of 29 weeks. From 20 weeks onward till 72 week age, all the birds were offered commercial layer rations ad libitum, prepared according to climatic conditions. The results of the study revealed that birds reared under natural and constant light had higher weights than decreasing light, yet they could not out perform during production period. The effect of feed and nutrient restriction, on the other hand, was found significant during rearing as well as production period. The birds exposed to higher level of feed and those exposed to nutrient restriction were lighter in weight. The 100% fed birds laid their first egg at an early age. However, those reared on 85% of the recommendation excelled all other groups in terms of produced number of eggs, egg mass, hen housed and hen day production and net returns.

• 생태와환경
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• 제33권1호통권89호
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• pp.9-22
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• 2000

본 연구에서는 남조류의 독성물질 배출 및 분해양상을 밝히고자 대청댐 지류인 옥천천의 스컴을 채취, 실험대상으로 하였다. Light와 dark 상태로 분리${\cdot}$배양한 배지에는 조사를 하는 동안 다른 영양염류는 첨가하지 않았다. 그 결과 세포내에서 microcystins의 총량은 세포수가 감소함에 따라 감소하였으며 Microcystis aeruginosa의 현존량과 비교하였을 때 light와 dark 상태의 경우 $r^{2}$값이 각각 0.96과 0.97로 높은 상관관계를 보였고 dark 상태에서 보다 더 빠른 감소추세를 보였다. 또한 세포에서 수체로 용존되는 microcystins의 량은 세포내에 존재하는 양의 극히 일부임을 확인 할 수 있었고 세포내에 분포하는 microcystins의 농도는 종류에 따라 차이를 보여 microcystin-RR>-LR>-YR의 순으로 존재하는 것으로 나타났다. 이러한 결과는 옥정호과 제천천을 대상으로 한 수심별 조사에서도 동일한 양상을 보였다. 수체에서 검출된 microcystins의 양은 점성물질의 양과 함께 light와 dark 상태에 따라 뚜렷한 차이를 보였으며 light의 경우 $r^{2}$값이 -0.75의 역의 상관관계를 보였다. 남조류 세포 및 microcystins에 대한 light와 dark 상태에서의 서로 다른 농도 결과는 배양 상태에 따른 미생물의 분해양상의 차이와 미생물에 대한 점성물질의 영향으로 추정된다.