• 대한임베디드공학회논문지
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• 제10권2호
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• pp.101-108
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• 2015

In this paper, a robust traffic light detection method is proposed by using vision sensor and DGPS(Difference Global Positioning System). The conventional vision-based detection methods are very sensitive to illumination change, for instance, low visibility at night time or highly reflection by bright light. To solve these limitations in visual sensor, DGPS is incorporated to determine the location and shape of traffic lights which are available from traffic light database. Furthermore the geometric relationship between traffic light and vision sensor is used to locate the traffic light in the image by using DGPS information. The empirical results show that the proposed method improves by 51% in detection rate for night time with marginal improvement in daytime environment.

• 청정기술
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• 제6권1호
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• pp.71-78
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• 2000

본 연구는 광합성 균주인 C. thiosulfatophium을 이용한 황화수소의 생물학적 탈황공정시 광에너지를 저감시키기 위해 광원의 종류와 광조사 유형에 따른 탈황효율을 조사하였다. 광에너지를 저감시키기 위해서는 반응기내 광분산 효율을 극대화시켜야 한다. 광이용효율을 높이기 위해, 세균농도와 생성부산물의 증가에 의한 빛의 산란과 흡수가 세균성장에 미치는 영향에 관한 연구와 미생물이 필요로 하는 파장의 빛을 최대로 공급하기 위해 LED, 백열등, 태양광 등을 이용한 광원의 최적화 연구, 그리고 외부조사형 광반응기의 광투과 효율의 한계를 극복하기 위한 광섬유를 이용한 내부조사형 광반응기에 대한 연구를 수행하였다.

• 수면정신생리
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• 제27권1호
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• pp.1-7
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• 2020

Mobile digital devices are very familiar and useful devices in the daily life of modern people, and are used for various tasks such as communication, reading, writing, and playing media. As the use of mobile digital devices has become more prevalent, user time has also been increasing. In particular, the number of people who use digital devices before sleep is growing. The light pollution associated with these devices is classified into four categories: urban sky glow, glare, light trespass, and clutter. The pattern in which modern people use digital devices corresponds to light pollution caused by light trespass and clutter from light exposure to artificial light at night. The light pollution caused by digital devices can cause melatonin secretion suppression, delayed sleep onset, reduction of sleepiness before bedtime, and periodic rhythm and cognitive function disturbances. In addition, a study of children and adolescents showed there may be disturbances in the sleep-wake cycle and circadian rhythm, deterioration of sleep quality, and daytime fatigue due to light pollution caused by artificial light at night from mobile digital devices. A multi-faceted research effort is also necessary to investigate the healthy use of mobile digital devices based on research evidence and insights with an accurate evaluation of the influence of mobile digital devices as a form of light pollution.

• 농업생명과학연구
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• 제44권6호
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• pp.61-67
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• 2010

중부지방에서 동절기에 월동가능한 상록지피식물의 이용가능성을 알아보고자 Ajuga reptans와 Carex morrowii 'Variegata', Dianthus 'Night Star', Hedera helix 'Ivalace', Pachysandra terminalis, Sedum rupestre 등 총 6종의 실험재료를 대상으로 0, 30, 70%의 차광처리에 따른 내한성 증진실험을 실시한 결과, 모든 처리구에서 40% 이하의 생존율을 나타낸 Dianthus 'Night Star'를 제외하고는 차광처리에 관계없이 Ajuga reptans와 Carex morrowii 'Variegata', Sedum rupestre은 50% 이상의 생존율과 상록의 잎을 유지했다. 그러나 Hedera helix 'Ivalace'와 Pachysandra terminalis는 0% 조건에서 전부 고사하였으나 70% 광조건에서는 40% 이상의 생존율을 나타냈다. 따라서 일부 내한성이 떨어지는 상록지피종들도 광조건의 조절에 따라서 상록의 잎을 유지하면서 월동 가능할 것으로 사료된다.

• 감성과학
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• 제20권4호
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• pp.135-142
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• 2017

In the present study, we investigated the physiological effects of smartphone use at night when the display luminance and white balance were differently manipulated. Two levels of luminance and two types of white balance were combined to form four types of displays. Subjects were instructed to use smartphones between 23:00 to 01:00 twice a week for two weeks, and for each trial, subjects were given one of the four display types. Melatonin concentration in the saliva, body temperature and heart rate were measured before and after each experiment. The experimental result showed that the low luminance display supported melatonin secretion and thermoregulation compared to the high luminance display. With regard to the white balance, higher melatonin level was observed when using the display that filtered blue light. The low luminance display together with yellowish tint best supported restful sleep at night in terms of every physiological response. This study collectively demonstrates that bright and blue light emitted from smartphone displays adversely affect melatonin secretion, body temperature, and heart rate, and therefore, suggests the use of a display with low luminance or a display that filters blue light for a restful sleep at night.

• 수산해양기술연구
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• 제38권3호
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• pp.217-225
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• 2002

광자극에 대한 역돔, Oreochromis niloticus[Linnaeus]의 심전도를 구명하기 위하여 16~18$^{\circ}C$ 수온에서 어체내에 전극을 삽입하여 3가지 광자극 (10, 100, 400 lu$\chi$)에 대한 심전도를 서간과 야간으로 구분하여 60분간 연속적으로 조사한 심전도를 상태별로 분석한 심박수와 생체전위는 다음과 같다. 1. 역돔은 마취 후 3분 뒤에 안정상태에 도달하였고, 안정상태에서 평균심박수는 서간에 47.6 beat/min, 야간에 45.1 beat/min였고, 평균생체 전위는 서간에 1.04 $\mu\textrm{V}$, 야간에 1.24 $\mu\textrm{V}$로 나타났다. 2 자극별 평균심박수는 \circled1 자극상태에서, 10 lu$\chi$인 경우 서간에 39.7 beat/min, 야간에 38.2 beat/min였고, 100 lu$\chi$인 경우 서간에 38.7 beat/min, 야간에 36.9 beat/min였으며, 400 lu$\chi$인 경우 서간에 36.8 beat/min, 야간에 35.8 beat/min로 나타났고, \circled2 회복상태에서, 10 lu$\chi$인 경우 서간에 47.1 beat/min, 야간에 46.0 beat/min였고, 100 lu$\chi$인 경우 서간에 47.2 beat/min, 야간에 45.6 beat/min였으며, 400 lu$\chi$인 경우 서간에 48.1 beat/min, 야간에 46.6 beat/min로 나타났다. 3. 자극별 평균생체전위는 \circled1 자극상태에서, 10 lu$\chi$인 경우 서간에 1.22 $\mu\textrm{V}$, 야간에 0.71$\mu\textrm{V}$였고, 100 lu$\chi$인 경우 서간에 0.63 $\mu\textrm{V}$, 야간에 0.90 $\mu\textrm{V}$였으며, 400 lu$\chi$ 인 경우 서간에 1.39 $\mu\textrm{V}$, 야간에 1.63 $\mu\textrm{V}$로 나타났고, \circled2 회복상태에서, 10 lu$\chi$인 경우 서간에 1.26 $\mu\textrm{V}$, 야간에 1.59 $\mu\textrm{V}$였고, 100 lu$\chi$인 경우 서간에 2.63 $\mu\textrm{V}$ 야간에 3.65 $\mu\textrm{V}$였으며, 400 lu$\chi$인 경우 서간에 2.52 $\mu\textrm{V}$, 야간에 3.67 $\mu\textrm{V}$로 나타났다.

• 수산해양기술연구
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• 제37권2호
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• pp.124-132
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• 2001

광 자극에 대한 향어, Cyprinus carpio [Linnaeus]의 심전도를 규명하기 위하여, 어체내에 전극을 삽입하여 3가지 광 자극 (10,100,400 lux)에 대하여 심전도를 주간과 야간으로 구분하여 60분간 연속적으로 조사한 심전도를 현황별로 분석한 심전수와 생체전위는 다음과 같다. 1. 향어는 마취후 5분 뒤에 안정상태에 도달하였고, 안정상태에서 평균심전수는 주간에 64.9 beat/min, 야간에 65.3 beat/min였고, 평균생체전위는 주간에 36.9 nV, 야간에 32.9nV로 나타났다. 2. 자극별 평균 심박수는 1) 자극상태에서, 10 lux인 경우 주간에 68.7 beat/min, 야간에 46.0 beat/min였고, 100 lux인 경우 주간에 53.4 beat/min, 야간에 44.1 beat/min였으며, 400 lux인 경우 주간에 53.2 beat/min, 야간에 40.1 beat/min로 나타났고, 2) 회복상태에서, 10 lux인 경우 주간에 67.9 beat/min, 야간에 57.2 beat/min였고, 100 lux인 경우 주간에 68.8 beat/min, 야간에 61.0 beat/min였으며, 400 lux인 경우 주간에 69.6 beat/min, 야간에 63.6 beat/min로 나타났다. 3. 자극별 평균생체전위는 1) 자극상태에서, 10lux인 경우 주간에 59.1 nV, 야간에 24.0 nV였고, 100 lux인 경우 주간에 26.8 nV, 야간에 45.6 nV였으며, 400 lux인 경우 주간에 71.7 nV, 야간에 14.4 nV로 나타났고, 2) 회복상태에서, 10 lux인 경우 주간에 38.8 nV, 야간에 27.3 nV였고, 100 lux인 경우 주간에 29.0 nV, 야간에 39.3 nV였으며, 400 lux인 경우 주간에 66.1 nV, 야간에 21.4 nV로 나타났다.

• Asian-Australasian Journal of Animal Sciences
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• 제32권6호
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• pp.904-911
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• 2019

Objective: The study was conducted to evaluate the effects of night light regimen on growth performance, antioxidant status and health of Lingnan Yellow broiler chickens from 1 to 21 days of age. Methods: A completely randomized factorial design involved 2 photoperiods (constant lighting [CL], 24 L:0 D and intermittent lighting [INL], 17 L:3 D:1 L:3 D)${\times}2$ light intensities (10 lx and 30 lx). A total of one thousand six hundred and eighty 1-d-old Lingnan Yellow broiler chicks were randomly divided into 4 treatments with 6 replicates (70 birds per replicate). The experiment lasted for 21 d. Results: Photoperiods and light intensities had no effect on average daily gain, feed conversion ratio, and mortality of the broiler chickens (p>0.05). The INL had a significant effect on average daily feed intake (p<0.05) of broiler chickens compared with CL. Photoperiod and light intensity had an interactive effect on melatonin (MT) concentration (p<0.05). At CL, reducing light intensity increased MT concentration; INL birds had higher MT but MT concentration was not affected by light intensity. There was an interactive effect on glutathione peroxidase (GPx) and catalase (CAT) in serum and total antioxidant capability (T-AOC) in liver between photoperiod and light intensity. With the decrease of light intensity, the activities of GPx and CAT in serum and T-AOC in liver increased in CL group (p<0.05). Broiler chickens reared under INL had better antioxidant status and 10 lx treatments had higher activities of CAT in serum than 30 lx (p<0.05). Different photoperiods and light intensities had no effect on malondialdehyde. There was an interaction between photoperiod and light intensity on serum creatine kinase (CK) concentration (p<0.05). At CL, the elevated light intensity resulted in an increase in CK content; INL birds had lower CK concentration especially in low light intensity group. Besides, INL and low light intensity significantly reduced the concentration of serum corticosterone and heat shock protein 70 (p<0.05). Serum immunoglobulin M contents were increased in broiler chickens reared under the INL compared with CL group (p<0.05). Conclusion: Results above suggest that the night light regimen of INL and 10 lx could be beneficial to the broiler chickens from 1 to 21 days of age due to the better health status and electricity savings.

• 한국군사과학기술학회지
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• 제9권2호
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• pp.34-41
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• 2006

This paper describes the general considerations and operational applications of aircraft night vision goggle(NVG). The operators should recognize the NVG characteristics, natural night light sources and interoperability between them. And they have to keep attention to the method to take steps to avoid misperceptions, illusions during flight, and the negative impact on the effectiveness and safety of the mission. The considerations based on the interoperability between NVG and night operation suggest the evaluation items of NVG field test and flight test.

• 수산해양기술연구
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• 제30권2호
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• pp.78-85
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• 1994

The author carried out an experiment to find out the response of Striped puffer. Fugu xanthoperus (Temminck et Schlegel) to the color lights. The experimental tank (300L$\times$50W$\times$50Hcm) was set up in a dark room. Six longitudinal sections with 60cm intervals are marked in the tank to observe the location of the fish. Water depth in the tank was kept 50cm level. Light bulbs of 20W at the both ends of the tank projected the light horizontally into the tank. Two different colored filters were selected from four colors of red, blue, yellow, and white, and the were placed in front of the light bulbs to make different colors of light. Light intensity was controlled by use of auxiliary filiters intercepted between the bulb and the filter. The fishes were acclimatized in the dark for 60 minutes before they were employed in the experiment. Upon turning on the light, the number of fish in each section was counted 40 times in 30 second intervals, and the mean of the number of fish in each section was counted 40 times in 30 second intervals, and the mean of the number of fish in each section was given as the gathering rate of the fish. The colors favourited by the fish was found in order of blue, yellow, white and red in the daytime, and blue, white, yellow and red at night. The difference of the average distribution on two different colors of light was 13.12%(4.10-26.55%), and the difference in the daytime(14.79%) was larger than at night (11.45%). Constantly the gathering rate of fish on illumination period was fluctuated with instability. As the gathering rate of fish on illumination period was fluctuated with instability. As the gathering rate on one color of light increased, the gathering rate on the other color of light decreased. The difference of the gathering rate on two different colors of light was comparatively distinct and the difference in the daytime was larger than at night.