• 한국조경학회지
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• 제19권4호
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• pp.46-57
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• 1992

This study was carried out to compare physiological characteristics of winter green cultivar (Buxus microphylla van. koreana 'Hanlim') with those of native cultuvar and clucidate the effect of environmental factors such as light intensity, time of shading, and nutrients etc. on leaf color in Korean boxwood(Buxus microphylla var. koreana Nakai). The results are summarized as followed; The 'Hanlim' cultivar had higher contents of chlorophyll as compared with native cultivar from September, 1989 to March, 1990. However, at April, 1990, native cultivar had higher chlorophyll contents. In the rate of photosynthesis, 'Hanlim' cultivar was higher than native cultivar from September to December, 1989, but showed the opposite trend from March to April, 1990. As to the period of browning, 'Hanlim'cultivar had stayed green even after November 22, 1989, while the foliage of native cultivar turned yellowish brown color through the winter. The contents of nitrogen and potassium of 'Hanlim' cultivar werehigher than those of the native cultivar. However native cultivar had higher rate of phosphorus, magnessium, and calcium. In the effect of environmental factors such as light intensity, time of shading, and nutrients etc. on leaf color in Korean boxwood(Buxus microphylla var. koreana Nakai), chlorophyll contents were increased with shading and leaves grown 70% shading had twice as much as those of full sunlight, fertilized plot. Nutrient fertilization increased chlorophyll contents and values of color in boxwood too. In the shading times, early shading time maintained effectively green color of boxwood in winter. Therefore, in case of native cultivars, it has planted at full sunlight area until now and color of leaves turned yellowish brown color through the witner. However, it will maintain green color of leaves by planting at shade area. In addition to, as 'Hanlim' cultivar had benefits of maintain green color of leaves during winter, it will be planted at full sunlight area to landscape plants.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1991년도 하계학술대회 논문집
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• pp.486-491
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• 1991

The photovoltaic modules have each maximum power point, which depending on the intensity of sunlight, modules temperature and etc. Cuk converter is used to obtain the maximum charging power from photovoltaic modules to storage batteries. This paper proposed to a new tracking control method by detecting its current and voltage in photovoltaic power generation system controlled by microprocessor, in order to operate at the maximum power point tracking(MPPT) even if the sunlight and the temperature are varied.

• 한국환경보건학회지
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• 제26권2호
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• pp.49-58
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• 2000

The present study was performed to investigate photodegradation rate constants and degradation products of phosphamidon and profenofos by the USEPA method. The two pesticides were very stable in 16 days exposure of sunlight from September 3 to 22, 1999 and humic acid had no sensitizing effect on the photolysis of each pesticide in sunlight. In the UV irradiation test, phosphamidon was rapidly degraded as increasing UV intensity. In case of UV irradiation with TiO2 and with TiO2 powder amount, degradation of profenofos showed no significant difference with UV irradiation. Photodegradation rate of profenofos was slower than that of phosphamidon. In order to identify photolysis products, the extracts of degradation products were analyzed by GC/MS. The mass spectra of photolysis products of phosphamidon were at m/z 153 and 149, those of the profenofos were at m/z 208 and 240, respectively. It was suggested that the photolysis products of phosphamidon were 0, 0-dimethyl phosphate(DMP) and N, N-diethylchloroacetamide, those of profenofos were 4-bromo-2-chlorophenol and 0-ethyl-S-propyl phosphate.

• 한국실내디자인학회논문집
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• 제26권4호
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• pp.30-41
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• 2017

Sunlight is perceived by human beings first through the epidermis to space, and is a non - material medium that provides physical awareness of space, diversified expression of spaces, and plenty experience. The purpose of this study is to investigate the characteristics of active building skin based on the inflow of natural light required by humans, looked through among the works of Jacques Herzog & Pierre de Meuron, which show the characteristics of active building skin, TEA(Tenerife Espacio de las Artes, 2008), Messe Basel New Hall (2013) and Elbphilharmonie (2016). First, the interaction between Sunlight and space is divided into spatial characteristics and sensitivities according to their concepts, properties, and characteristics. The characteristics of active skin by light are classified into a physical approach and a constructive approach. Second, (El Croquis 152/153) and analyzed the images, detail drawings, and elevations, and simulated them in 3D to express the relationship between light and active building skin. Third, the changes of light intensity, light color, and distribution of light according to the time of light entering and the skin are determined from 6:00 am to 6:00 pm. Fourth, the images taken from January 30th to February 7th, 2017 on the site were compared with the computer simulated images, and the relationship between active skin and light was compared. This study is to recognize the existence and necessity of light required for human being through the activated epidermis differentiated from the limited or closed epidermis focused on information transmission, I would like to emphasize that I would like to take a step closer to the necessity and possibility of new attempts and developments so that I can feel the various experiential spaces by.

• International Journal of Industrial Entomology and Biomaterials
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• 제35권2호
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• pp.100-105
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• 2017

Under natural conditions, black soldier fly, Hermetia illucens (L.) (Diptera: Stratiomyidae), colonizes in warm temperate regions, and is active in Korea from May through October. Information on black soldier fly rearing, which is affected by seasonal factors in Korea, is limited. Oviposition by black soldier flies is dependent on light intensity and wavelength. Therefore, continuous mass rearing of this fly requires determination of optimal artificial conditions of illumination. In this study, we compared the number of eggs laid under an artificial light source (750 watt HPL lamp) versus nature sunlight. Our results showed that compared to oviposition under natural sunlight, the use of one or two lamps for 7 hours, resulted in only 43 and 76%, of the total number of eggs laid under natural sunlight, respectively. We also investigated the hatchability of oviposited eggs under artificial illumination and under natural sunlight. The hatching rate under the former was much significantly lower than under the latter. Further detailed research is required to develop methods for successful mass rearing of black soldier fly throughout the year by means of an indoor system.

• 한국산림과학회지
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• 제81권1호
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• pp.11-20
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• 1992

본(本) 연구(硏究)의 목적(目的)은 자엽(子葉)의 유무(有無), 광도(光度) 및 양료조건(養料條件)을 변화(變化)시켜 주었을 때 상수리나무(Quercus acutissima Carr.) 묘목(苗木)의 엽록소합량(葉綠素合量), 광합성능력(光合成能力), 그리고 ribulose-diphosphate(RuDP) carboxylase의 활성(活性)을 알아보는 것이다. 본(本) 연구(硏究)에서 얻은 결과(結果)를 요약(要約)하면 다음과 같다. 1. 마지막 수확에서 전광의 25% 조건(條件)을 제외한 모든 광도(光度) 아래서 엽록소(葉綠素) 합량(合量)은 거의 비슷했다. 2. 전광, 전광의 75% 조건(條件)에서 광합성능력(光合成能力)은 전광의 25% 조건보다 더 좋게 나타났다. 3. RuDP carboxylase의 활성(活性)은 광도(光度)가 증가할 수록 커졌다. 4. RuDP carboxylase 활성(活性)은 엽록소(葉綠素) a의 합량(合量)이(r=0.792) 엽록소(葉綠素) b의 합량(合量)(r=0.314) 보다 더 상관(相關) 관계가 높았다. 5. 전광의 75% 조건(條件)에서 1, 2% 양료(養料) 조건(條件)으로 사용하였을 때 RuDP carboxylase의 활성(活性)은 0.5% 양료(養料) 조건(條件)에 비해서 높았다.

• 임산에너지
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• 제22권3호
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• pp.20-28
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• 2003

참나무류 주요 수종을 대상으로 다양한 광선 조건에 식재된 실생묘의 활착 및 상대생장량과 광선에 대하여 민감하게 작용하는 엽록소 함량의 계절적인 변화를 조사하기 위하여 상수리나무 1-1묘, 1-0묘, 신갈나무 1-0묘, 졸참나무 1-0묘, 굴찬나무 1-0묘를 상수리나무 임분내에 상층임분 밀도를 자연광의 81%, 34%, 21% 등 3가지로 조절하였다. 조사대상 수종의 묘목을 20m x l0m 크기의 시험구에 100본씩 식재하여 활착율, 상대생장량, 엽록소 함량을 비교하였다. 상수리나무 1-1묘가 평균 73%로 다른 수i종에 비해 높은 활착율을 보였고, 상수리나무 1-0묘가 66%, 신갈나무와 졸참나무가 각각 56%, 45%였으며, 굴참나무는 41%로 이식후 활착율이 가장 낮게 나타났다. 또한 자연광의 81% 실험구에서 대부분의 주요 참나무류 수고, 근원경 생장이 가장 좋은 경향을 보여 주고 있었으며 자연광의 21% 실험구에서는 오히려 광도가 낮아지면서 생장이 상대적으로 저해되는 경향을 보여 주고 있다. 엽록소 함령(a, b, 총엽록소 함향)은 광도가 낮아지면서 엽록소 함량도 낮아지는 것을 알 수 있었다. 그러나 주요 참나무류 수종의 피음 효과에 대한 생장반응은 지속적으로 관찰해야 하며, 엽록소 함량과 생장에 밀접한 관련이 있는 생리적 특성에 대한 연구도 필요할 것으로 생각된다.

• 한국조경학회지
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• 제32권4호
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• pp.1-6
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• 2004

This study was carried out to investigate the effects of light intensities on the growth and net photosynthesis of Piper kauzura under different shading levels : 0％, 50％, 70％ and 90％ of sunlight. Mortality rate was lowest under a 70％ shading level but 0％ and 90％ shading levels were about 46％ and 53％ each respectively. Plant height was shorter and leaf size was smaller and yellowish under a 0％ shading level but increased when light intensity was decreased. However, under a 90％ shading level, growth of Piper kauzura was inferior to other treatments. Top fresh weight was about 11.24g under a 50％ shading level and about two times higher than that observed in about 6.6g under a 90％ shading level. Root fresh weight was about 7.7g under a 0％ shading level and was about two times higher than that showed in about 3.84g and 3.64g under 90％ and 70％ respectively. Total chlorophyll content and chlorophyll a/b rate were increased when light intensity was decreased. Net Photosynthesis achieved the highest under a 70％ shading level and maximum photosynthetic photon flux density was 150 molㆍm/sup -2/ㆍs/sup -1/. Therefore, growth of Piper kauzura was good under 50∼70％ shading, Meaning that it is an indoor plant that could be highly utilized.

• 한국환경복원기술학회지
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• 제10권1호
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• pp.16-22
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• 2007

This study was carried out to investigate the effects of shading conditions for appropriate light level for several floricultural plants native to Korea. The results under the different shading levels of 0, 30, 50, 60% and full sun light are as follows; Growth of Miscanthus sinensis and Pennisetum alopecuroides, which are heliophyte plants, were better under 30% shading condition than full sunlight. Higher shading levels was poor than control. Growth of Sedum spectable was decreased when light intensity was decreased. As shading level increased, growth reduction rate in Sedum spectable were higher than that of other species. Growth and ornamental value of Arisaema amurense, which is sciophyte plants, were increased under 50% shading.

• 한국약용작물학회지
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• 제23권1호
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• pp.43-48
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• 2015

This study was carried out in order to investigate the photosynthesis response and leaf characteristics of Peucedanum japonicum growing in forest farming. The experiment was performed by leaf mold (pine tree and chestnut tree) and shading levels (0%, 35%, 50% and 75% shading). Light relative intensity was 100% (full sunlight), 60.3% (35% shading), 35.1% (50% shading), and 17.4% (75% shading) respectively. Light response curves of pine-leaf mold and chestnut-leaf mold were the highest in control (full sunlight) and these were getting lower in the higher shading level. Photosynthesis capacity and light saturation point were indicated higher in chestnut-leaf mold within the same shading level. As the shading level increased, maximum photosynthesis rate decreased. And apparent quantum yield was not indicated statistically significant difference from all treatment. Leaf area, leaf length and leaf width were significant higher in 35% shading and control under chestnut-leaf mold in all treatment. As the shading level increased, LAR (leaf area ratio), SLA (specific leaf area) and SPAD value decreased in pine-leaf mold and chestnut-leaf mold. As a result of surveying the whole experiment, P. japonicum is judged better growth and higher yield by maintaining 35% shading (relative light intensity 60%) under chestnut-leaf mold in forest farming.