• 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.

• Plant Biotechnology Reports
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• 제4권4호
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• pp.303-309
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• 2010

Endoreduplication is a developmental process that is unique to plants and occurs in all plants. The present study aimed to assess endoreduplication in various explant tissues and regenerated somatic embryos of Doritaenopsis. We further investigated the effects of light quality on endoreduplication and somatic embryo proliferation. To this end, we studied endoreduplication in leaves and root tips from regenerated plantlets and somatic embryos and in developing somatic embryos under 4 types of lighting conditions: red light, red + far-red light, red + blue light, and white light. We found that the degree of endoreduplication varied in different explants, and that the choice of explants used also influenced the ploidy levels of the newly regenerated somatic embryos. The DNA content of the leaf (2C-8C) was less than that of the root tip (2C-16C) and somatic embryo (2C-64C). In terms of light quality, the combination of red and far-red light produced the highest number of somatic embryos, while maintaining a low degree of endoreduplication. The data obtained indicate that this light combination stimulates somatic embryogenesis in Doritaenopsis and may exert some control on endoreduplication during cell division. These findings can be applied to achieve a reduction in somaclonal variations for the purpose of mass proliferation and genetic improvement.

• 조명전기설비학회논문지
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• 제24권10호
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• pp.58-66
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• 2010

This paper shows an implementation and management result of wireless networks based security light control system, which performs a great role in protection of pedestrians and prevention of crime. Conventional security light units have severe limits in confirmation and inspection of security light unit failure, like wilful damage by someone or failure by influence of other equipment or failure by spontaneous heat-increase, and so on. In addition, local government offices are responsible for maintenance of security light units and as a matter of fact, most of civil complaints are about security light units. It is an obvious that the existing security light maintenance system reaches the limit and the security light maintenance problem is a difficulty of local government. Therefore, efficient security light control system is needed, which enables central control and intelligent maintenance. Moreover, the system has to be easy to control and has to be stable. In this study, wireless sensor network based security light control system is implemented, which is independent of programming language and platform, and which is simple to control and extend the system. The proven protocols, HTTP and SOAP, are utilized in order to improve the system reliability. This paper shows the excellence of our proposed system by implementing and operating it in real environment.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2001년도 추계학술대회 논문집
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• pp.211-216
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• 2001

It is well known that composite laminates are easily damaged by low velocity impact. Low velocity impact damage characteristics and residual compressive strength of composite laminates used in light rail transit are investigated. The damage of composite laminates subjected to impact loading are occurred matrix cracking, delamination, and fiber breakage. The damage of matrix cracking and delamination are reduced suddenly the compressive strength after impact. The objectives of this study is to evaluate impact characteristics and the relationship between impact force and inside damage of composite laminates by low velocity impact loading. UT C-scan is used to determine impact damage areas by impact loading.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2004년도 추계학술대회 논문집
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• pp.854-861
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• 2004

LRT(Light Rail Transit System) is devided into steel-wheel train, LIM and rubber tired AGT(Automated Guide-way Transit System) The main features of LRT are low construction cost, low space, low noise, Environment-friendly, fastly, low maintenance cost. it's a civil transit transfer system of new generation became popular advanced nation. In this study, the beginning designed manufactureing rubber tired AGT turnout and guide-way system for the field application. We hope reliability for the system shall home production of turnout and guide-way

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2007년도 7th International Meeting on Information Display 제7권1호
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• pp.679-682
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• 2007

We have developed low voltage operating OLEDs with new electron transport layer. The device having a structure of ITO/2TNATA/HTL:Rubrene(1%)/HTL /new ETL/LiF/Al have been used. The voltage for achieving $1,000\;cd/m^2$ was 4.1 V, whereas the turn on voltage for the brightness of $1\;cd/m^2$ was 2.8 V. This high luminance at low operating voltage is caused by the high current density, resulting from high electron conduction property of the new electron transport layer.

• Medical Lasers
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• 제9권2호
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• pp.119-125
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• 2020

Photobiomodulation forms the basis of photomedicine and is defined as the effect of coherent or non-coherent light sources, such as low-level lasers and light-emitting diodes, on cells and tissues. This treatment technique affects cell functions, proliferation, and migration, and plays an important role in tissue regeneration. Mesenchymal stem cells (MSCs) are known to be beneficial for tissue regeneration, and the combination of stem cell therapy and laser therapy appears to positively affect treatment outcomes. In general, a low-power laser has a positive effect on MSCs, thereby facilitating improvements in different disease models. This study elucidates the mechanisms and effects of low-power laser irradiation on the proliferation, migration, and differentiation of various MSCs that have been examined in different studies.

• 한국작물학회지
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• 제39권4호
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• pp.307-316
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• 1994

광전역이 수도엽신의 광합성에 미치는 영향을 구명코져 일반형 2품종(추청벼, 화진벼)과 통일형 2품종(삼강벼, 칠성벼)에 대하여 분얼기에서 출수기에 이르는 기간동안 무처리, 30%, 70% 차광처리하여 분얼기와 출수기에 고저 광도 조건하에서 광합성 특성 및 이와 관련한 생리, 생태적 특성을 검토한 결과를 요약하면 다음과 같다. 1. 차광처리에 의한 건물중의 감소는 70% 차광처리구에서 많았으며, 분얼기보다 출수기가 현저하였고, LAR 및 SLA도 출수기에 높았다. 2. 분얼기 저광도(5Klux)하의 개체의 광합성 능력은 낮은 편이며, 무처리<30%<70% 차광처리의 순이었고, 고광도(33Klux)하에서는 무처리구 보다 30% 차광처리구가 가장 높았다. 3. 출수기에 단엽의 광합성 능력은 무처리에 비하여 70%차광처리구가 오히려 높았다. 4. 광합성에 대한 호흡비율(Respiration/Photosynthesis${\times}$100)은 무처리구에 비하여 차광처리구에서 전반적으로 낮았다. 5. CGR, RGR, NAR은 무처리구에 비하여 차광정도가 높을수록 감소하였다. 6. 차광처리는 수량 구성요소중 특히 1수 영화수를 감소시켜 정조수량이 감소되고, 따라서 수확지수도 저하되었다.

• 대한수의학회지
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• 제34권4호
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• pp.715-725
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• 1994

The ultrastructural investigations of the parotid gland of Korean native goat were carried out by transmission electron microscopy. The results were as follows; 1. The acini of parotid gland were composed of light and dark acinar cells. 2. In the light acinar cells, the secretory granules were classified into three types according to their electron densities and dense bodies. One type of granules was low electron density and had no dense bodies. Another type was low electron density and had dense bodies, and the other type was low electron density and had granular dense bodies. 3. The secretory granules of dark acinar cells showed high electron density and were also calssified into three types by dense bodies as the same way as in the light acinar cells. 4. The intercalated ducts consisted of simple cuboidal epithelium. The nuclei of epithelial cells were oval or round form, located at the central part, and had infolding nuclear membranes and one or two nucleoli. 5. The cells of both of the striated and excretory ducts were composed of light cells, dark cells, specific light cells and basal cells. 6. The nerve terminals were distinguished into two types. One had large granular synaptic vesicles, and another had small agranular synaptic vesicles.

• 한국정보통신학회논문지
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• 제22권9호
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• pp.1237-1242
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• 2018

광 역학 치료법은 그 효과가 특정 위치의 암세포에 국한되어있어 주변의 정상 세포에 큰 영향을 미치지 않기 때문에 다양한 부작용이 존재하는 현재의 암 치료법의 대안으로 제안되어 왔다. 이러한 광 역학 치료에는 광감응제를 선택적으로 자극시키기 위해 레이저를 이용하고 있으나, 고가의 치료비용과 높은 발열현상으로 사용에 제한적이다. 그러나 다양한 파장의 빛을 발할 수 있는 소형 발광 다이오드가 저가로 개발됨에 따라 대체가 가능하며, 이는 광 역학 치료 장비의 소형화 및 저가의 치료 장비 개발에 큰 영향을 미치고 있다. 현재 활발하게 연구되는 광 역학 치료법은 다양한 광감응제를 이용하여 암세포의 사멸을 유도하는데 목적이 있으나, 특정한 파장을 중심으로 진행된 연구는 상대적으로 미비한 실정이다. 따라서 본 논문에서는 저렴하며, 발열현상이 작고, 다양한 파장대의 광원지원이 가능한 발광 다이오드를 사용하고 이를 아두이노로 제어하여 새로운 저가의 암세포 증식 억제 모듈을 개발함으로써, 그 효과를 정량적으로 분석하고 새로운 항암치료법을 제시하고자 한다.