• 한국기계가공학회지
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• 제13권5호
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• pp.98-106
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• 2014

This study was carried out to evaluate the plant growth rate according to the wavelength characteristics of LED light sources. In order to achieve this, red, green, blue and white LEDs were arrayed in a rectangle array consisting of LED modules which can be combined with each other.. This can facilitate the selection of the optimal characteristics of the light from monochromatic red, green, blue and white LEDs or mixed LEDs for plant growth. Experiments to evaluate the growth rate according to the wavelength characteristics of the LEDs with several plants, in this case ice plants, lettuce, barley, broccoli and chives, were performed.

• Journal of Veterinary Science
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• 제21권2호
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• pp.37.1-37.5
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• 2020

Poultry red mites (PRMs), Dermanyssus gallinae, are one of the most harmful ectoparasites of laying hens. Because of their public health impact, safe, effective methods to eradicate PRMs are greatly needed. Carbon dioxide (CO₂) was shown to eradicate phytophagous mites; however, there is no evidence that PRMs can be eradicated by CO₂. Thus, the efficacy of CO₂, applied by direct-spraying and dry ice-generated exposure, for eradicating PRMs was investigated. Both treatments eradicated > 85% of PRMs within 24 h and 100% of PRMs by 120 h of post-treatment. Therefore, these novel approaches may be useful for eradicating PRMs in clinical settings.

• 한국표면공학회:학술대회논문집
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• 한국표면공학회 2014년도 추계학술대회 논문집
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• pp.204-206
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• 2014

석탄 화력발전소에는 연소가스의 질소산화물(NOx) 저감을 위한 SCR(selective catalytic reduction)설비가 운전되고 있으며, SCR은 환원제인 암모니아($NH_3$)를 이용하여 연소가스 내에 질소산화물을 물과 질소로 분해하는 역할을 한다. 그러나, 연소가스 중의 일부 삼산화황($SO_3$)과 미반응 암모니아가 결합하여 황산암모늄염(Ammonium bisulfate; $NH_4HSO_4$)을 생성하며, 이는 후단 APH(air preheater)의 열소자에 점착된 후 분진들과 함께 성장하여 막힘을 야기한다. 막힘이 발생된 APH는 연소가스의 흐름을 방해하기 때문에 차압을 증가시키며, 이는 발전효율의 감소뿐만 아니라 급전정지를 초래한다. 이를 해결하기 위하여 $CO_2$ 드라이아이스 세정 방법을 적용하였으며, pilot-scale plant에서 실험을 수행하였다. 또한, 드라이아이스 공정변수인 분사압력과 분사시간을 제어하여 pilot-scale plant의 APH 열소자 표면에 생성되어있는 오염물질들의 제거효율을 관찰한 결과 95 %의 높은 제거효율을 보였다.

• 콘크리트학회지
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• 제14권4호
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• pp.56-58
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• 2002

$\ulcorner$콘크리트표준시방서$\lrcorner$ 에서는 "서중 콘크리트로서 시공해야 할 시기를 일률적으로 정하기는 곤란하나, 하루평균 기온이 $25^{\circ}C$ 또는 최고온도가 3$0^{\circ}C$를 초과하는 시기에 시공할 경우에는 일반적으로 서중 콘크리트로서 시공할 수 있도록 준비해 두어야 한다."고 규정하고 있고, $\ulcorner$ACI 305R$\lrcorner$ 에서는 "서중(hot weather)은 수분 손실률과 시멘트 수화율의 가속에 의하여 굳지 않은 콘크리트(fresh concrete)와 굳은 콘크리트(hardened concrete)의 품질을 저하시키는 다음 조건들이 공존하는 상태이다."고 규정하고 있으며 그 조건들은 a. 높은 대기 온도 b. 높은 콘크리트 온도 c. 낮은 상대습도 d. 바람의 세기(풍속) 이다.(중략)

• 식물분류학회지
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• 제36권1호
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• pp.61-89
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• 2006

풍혈지는 여름철에 너덜지대 사면의 암괴 틈에서 찬 공기가 스며 나오며, 또한 결빙현상을 보이는 국소적 저온환경을 형성하는 지역이다. 본 연구에서는 풍혈지에 대한 식물상적 조사를 바탕으로 식물지리학적 중요성과 보존의 필요성을 제시하고자 국내 주요 풍혈지 7개소에 대한 현지 조사를 실시하였다. 그 결과, 풍혈지에서 한들고사리, 두메고사리 좀미역고사리, 월귤, 뚝지치 등 식물지리학적으로 중요한 다수의 북방계 식물들이 조사되었다. 또한 수직분포면에서도 산우드풀, 민둥인가목, 요강나물, 산새풀, 집사초와 같은 아고산식물들이 해발이 낮은 풍혈지에 생육하는 특이성을 보이고 있었다. 풍혈지는 빙하기에 남하했던 북방계 식물들이 최후빙기 이후 이주과정에서 국소적 기후환경에 적응, 고립되어 있는 피난처로 판단되어진다. 고피난처인 풍혈지는 기상학, 지형학적 중요성뿐만 아니라 식물지리학적으로도 아주 중요한 서식지 형태로 소집단으로 격리 분포하는 북방계 식물 종들에 대한 보존생물학적 연구를 통한 합리적인 현지내 외 보존대책의 수립이 시급하다고 판단된다.

• 한국의류학회지
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• 제34권12호
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• pp.1933-1946
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• 2010

This paper is a comparative analysis of the $19^{th}$ century practice of indigo dyes and dyeing in Korea and England. From over hundreds species of indigo plants in the world, it was dyer's knotweed and woad that were cultivated in Korea; however, the only indigo plant grown in England was woad. Indigo dye was produced in the form of damp indigo sediment (jeon) in Korea; however, imported indigo (as a main dye) and couched woad (as an additional dye) were indigo dyes used in England. There existed three kinds of indigo vats, the ice vat, ash-water vat, and indigo sediment (jeon) vat, in Korea. The fresh leaves of indigo were used for both the ice vat and ash-water vat. The ice vat was very convenient for preparation, but had a weakness in the inability to produce a very deep shade of blue. The ash-water vat and indigo sediment (jeon) vat were in use for producing a very deep shade of blue. The indigo sediment Goon) vat was employed presumably only by professional dyers. The indigo vat practiced in England was categorized into two types; one was woad-indigo vat, and the other was an indigo powder vat prepared by using imported indigo rock. There was a tendency to adopt different kinds of indigo vats according to the material to be dyed. The woad-indigo vat was employed for the dyeing of wool. A few of chemical vats with imported indigo were adopted, especially for the dyeing of cotton. Indigo dyers in 19th century Korea were differentiated from the rest of the dyers. They managed the growing of indigo plants as well as the production of indigo sediment (jeon). Woad dyers in 19th century England handled woolen cloth as well as worsted and woolen yarn in general. However, they sometimes dyed silk skein as well. They produced several colors such as black, blue, slates, grays, by using both woad and imported indigo.

• Plant Resources
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• 제7권2호
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• pp.147-154
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• 2004

Antifreeze proteins (AFPs) accumulate in the leaves of barley during cold acclimation, where they may inhibit ice recrystallization and produce freezing resistance of the plant. Four parental diallel crosses of the barley varieties were used to determine the heritability of AFPs and the relationship between the accumulation level of AFPs and freezing resistance. The concentration of apoplastic proteins in the cold-acclimated leaves was increased in the mean by four-fold over as compared with that of nonacclimated. The diallel cross analyses revealed that the gene of Sacheon 6 was dominant and those of Reno and Dongbori 1 were recessive. The AFPs had high narrow-sense heritabilities. The general combining ability effects of Reno and Dongbori 1 were much higher than the other parents. The bands of 32-kD for GLP, 35-& 28-kD for CLP and 25-, 22- & 16-kD for TLP were observed in the apoplastic extracts from cold-acclimated plants, but there were no clear differences between the parents and Fl hybrids. The concentrations of AFPs were significantly correlated with the degree of freezing resistance, indicating that the concentration of AFPs in the plant is the very important factor for freezing resistance.

• Journal of Plant Biotechnology
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• 제30권4호
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• pp.323-328
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• 2003

토양 내의 고농도의 염은 심각한 환경스트레스 중의 하나로 농작물의 생산을 감소시킨다. 식물은 염 스트레스로부터 벗어나기 위하여 많은 단백질을 합성한다든지 유전자들의 발현을 조절하는 등 여러 가지 생리, 생화학적인 변화를 일으킨다. 퉁퉁마디는 우리나라에 자생하는 염생식물로 갯벌과 염전주위에서 생육한다. 퉁퉁마디의 생화학적, 분자생물학적 내염성 기구를 이해하기 위하여 differential display방법으로 NaCl에 의하여 발현이 증가되는 cDNA들을 분리하였다. 본 연구에서는 그 중 하나인 ShADL의 특성을 조사하였다. ShADL은fructose-1, 6-bisphosphate aldolase와 높은 유사성을 보였다. 이 유전자는 1293bp길이에 359개의 아미노산으로 구성된 open reading frame을 포함하고 있으며, 이로부터 추정되는 분자량은 39 kDa이었다. ShADL단백질은 애기장대의 aldolase와 86％의 높은 유사성을 나타내었으며 같은 염생식물인 com-mon ice plant의 adolase와는 78％의 유사성을 보였다. Northern 분석결과, ShADL 유전자는 NaCl의 농도가 증가함에 따라 발현량이 급격히 증가하는 것으로 나타났다.

• Ocean and Polar Research
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• 제25권4호
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• pp.653-662
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• 2003

Changes in the area of geo-ecosystem $(62^{\circ}09'S,\;58^{\circ}31'w)$ reflect climatic changes in the South Shetland Islands. Air temperature and deglaciation will increase. The ice-free space area at the SSSS 8- (ASPA 121) site has enlarged threefold during the last 21 years, thus creating conditions for inhabitation and succession. Wind, water and snow play important roles in transportation of geochemical components. They distribute nutrients, mineral substances, seeds, fragments of plants and animals, etc. Plant and animal colonization is patchy and it happens at random in an 'island' - like manner. The colonization pattern is dependant, to a high degree on physical factors. The newly uncovered ice-free areas are at first inhabited by a vascular plant known as the Deschampsia antarctica. The border of the land-oasis with Admiralty Bay is the place where the processes related to animal feeding at the sea and reproduction on the land take place. Bird colonies and pinniped lairs form centers of fertilization surrounded by high chemical gradients dependent on the direction of the flow of nutrients $(e.g.\;NH_4)$. During the last 25 years, the numbers of penguins in this region have decreased, and thus the amount of materials excreted on land has diminished. The numbers of fur seals change in multi-annual cycles, and their migration into this area is related to the E1 $Ni\~{n}o$ phenomenon. The numbers of elephant seals in the area did not change. Organic matter deposited by the sea onto the shore are a source of nutrients and deficient chemical elements on land. Mineral matter is washed out into the waters of Admiralty Bay. These processes change seasonally, and multi annually. Negative effects on the environment at Arctowski Station induced by man are slight, but noticeable nevertheless. Physical processes have the largest influence on the living conditions and distribution of plants and animals, and as a consequence, on the functioning of the geo-ecosystem in the coastal-shore zone of the Maritime Antarctic.

• Food Science and Biotechnology
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• 제17권2호
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• pp.413-416
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• 2008

Effects of extracts obtained from the flowers of Elsholtzia splendens on the serum lipid profile and hepatotoxicity in mice were investigated. Female ICR mice were given E. splendens ethanolic extract (ESEs) orally at a dose of 10 or 50 mg/kg BW for 50 days. Significant dose-dependent decreases in triglyceride and low-density lipoprotein (LDL)-cholesterol of serum were observed. In addition, ESEs prolonged the lag-time of LDL oxidation in vitro. In the serum of ICE mice given ESEs orally at 10 and 50 mg/kg BW, the serum levels of aspartate aminotransferase (AST) and lactic dehydrogenase (LDH) increased significantly, while total protein, albumin, creatinine, alanine aminotransferase (ALT), and total bilirubin did not change. Therefore, ESEs may be beneficial to human health, although it has some hepatotoxicity.