• ALGAE
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• 제33권3호
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• pp.269-278
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• 2018

Ocean warming can have significant negative impacts on population genetic diversity, local endemism and geographical distribution of a wide range of marine organisms. Thus, the identification of conservation units with high risk of extinction becomes an imperative task to assess, monitor, and manage marine biodiversity for policy-makers. Here, we surveyed population structure and genetic variation of the red seaweed Gracilaria vermiculophylla along the coast of China using genome-based amplified fragment length polymorphism (AFLP) scanning. Regardless of analysis methods used, AFLP consistently revealed a south to north genetic isolation. Populations at the southern coast of China showed unique genetic variation and much greater allelic richness, heterozygosity, and average genetic diversity than the northern. In particular, we identified a geographical barrier that may hinder genetic exchange between the two lineages. Consequently, the characterized genetic lineage at the southern coast of China likely resulted from the interplay of post-glacial persistence of ancestral diversity, geographical isolation and local adaptation. In particular, the southern populations are indispensable components to explore evolutionary genetics and historical biogeography of G. vermiculophylla in the northwestern Pacific, and the unique diversity also has important conservation value in terms of projected climate warming.

• 한국산림과학회지
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• 제102권1호
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• pp.156-160
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• 2013

전 지구적 온난화는 광합성과 생장을 포함한 육상생태계의 생산성에 영향을 미칠 것으로 예상되고 있다. 실외 실험적 온난화가 굴참나무(Quercus variabilis Blume) 3년생 묘목의 엽록소 함량 및 순광합성률에 미치는 영향을 알아보고자 1년생 묘목을 2010년 4월에 식재하고 2010년 11월부터 적외선등을 이용하여 온난화 처리구의 기온을 대조구보다 $3^{\circ}C$ 증가시켰다. 2012년 5월부터 10월까지 굴참나무 묘목의 총 엽록소 함량과 순광합성률을 측정한 결과 총 엽록소 함량은 5월, 7월, 8월, 9월, 10월에 온난화 처리구에서 대조구보다 높았으나, 이들 간의 차이는 10월에만 통계적으로 유의하였다. 또한 순광합성률은 5월, 9월, 10월에 온난화 처리구에서 대조구보다 각각 57.0%, 21.4%, 89.6% 높았으나, 5월과 10월에 이들 간의 차이가 통계적으로 유의하게 나타났다. 온난화 처리에 따른 굴참나무 묘목의 봄과 가을철 엽록소 함량 및 순광합성률 증가 경향은 생장을 일찍 시작하고 늦게까지 지속함으로써 생장기간이 늘어나는 것과 관련이 있을 것으로 추정된다.

• 한국산학기술학회논문지
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• 제21권7호
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• pp.350-356
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• 2020

목적: 본 연구는 수술 후 회복실에 입실한 환자에게 가온요법 간호중재 프로그램이 미치는 효과를 파악하여 간호중재방안 개발 및 기초자료를 제시하고자 시도된 비 동등성 대조군 유사 실험연구이다. 연구방법: 연구의 대상자는 가온요법 프로그램을 적용한 실험군 31명, 대조군 31명을 대상으로 실시하였다. 가온요법은 가온기를 통해 회복실에서 38~43℃ 범위 내 가온하였다. 대상자의 일반적 특성은 실수와 백분율로 파악하였고, 실험군과 대조군의 동질성 검정은 𝑥²-test와 In-dependent t-test로 파악하였다. 실험군과 대조군의 시간에 따른 체온, 통증, 전율의 차이는 repeated measure ANOVA로 파악하였다. 실험군과 대조군의 온도 편안감의 차이는 t-test로 파악하였다. 결과: 첫째, 수술 직후 반복 측정 결과 실험군과 대조군의 체온, 통증, 전율이 유의한 차이를 보였다. 둘째, 온도 편안감은 유의한 차이를 보였다. 결론: 이와 같이 수술 후 가온요법 중재 시 환자에게 긍정적인 효과가 있는 것을 확인할 수 있었다.

• 한국기후변화학회지
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• 제7권1호
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• pp.9-17
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• 2016

Climate change affects plant responses on physiological characteristics and growth, and Pinus densiflora, one of the major tree species in Korea, are expected to be particularly vulnerable to rising temperature and increased precipitation. This study was conducted to investigate the effects of an open-field warming and precipitation manipulation on physiological characteristics and growth of P. densiflora seedlings. Seedlings of 2-year-old P. densiflora were planted in April, 2013, in open-field nursery located at Korea University. The air temperature of warmed plots had been set to be $3^{\circ}C$ higher than the control plots using infrared lamps. Precipitation was manipulated to be 30% lower or higher than the control, using transparent panels and drip irrigation. Net photosynthetic rate, total chlorophyll content, seedling height, root collar diameter and biomass were measured from April, 2014 to April, 2015. The increase in new shoot biomass from warming was statistically significant, with the biomass in warmed plots about 2-fold higher than in the control plots in 2014 and 2015. This result might be related to advanced bud burst and increased occurrence of abnormal new shoots in warmed plots. Meanwhile, the results of net photosynthetic rate, total chlorophyll content, seedling height, root collar diameter and total biomass from warming and precipitation manipulation were not statistically significant, but tendencies of lower net photosynthetic rate and higher seedling height and biomass in warmed plots compared to the control were shown. Such might be speculated as results of the extended growth period. When root to shoot (R/S) ratio was calculated from the biomass data obtained in April 2014 and April 2015, increased R/S ratio was observed regardless of the treatments applied. Drought tolerance of P. densiflora and particularly low annual precipitation observed in 2014 were suggested as the possible reasons.

• 한국환경교육학회지:환경교육
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• 제25권2호
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• pp.149-160
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• 2012

This study examined the effects of reflective writing activities utilizing environmental related mass media. Two classes participated as an experimental group (n=31) and a control group (n=30). Both groups of students learned five different topics on environment, such as diversity of ecosystem, global warming, desertification, reduction of the amount of carbon, and eco-friendly behavior. The experimental group students was taught utilizing mass media about each topic and had opportunities of reflective writing about each topic, while the control group of students was taught through lectures. The results indicated that students in the experimental group represented significantly better scores on environmental worldview, environmental sensitivity, and eco-friendly behavior compared to the control group students (p<.01).

• 한국분무공학회지
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• 제22권4호
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• pp.203-209
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• 2017

The International maritime organization(IMO), in an effort to slow down the global warming, proposes reduction in ship's speed as a way to lower the rate emissions from ships. In addition, since ship's fuel cost have been increased, the shipping volumes, fuel-saving technology are being required urgently. Therefore, in this present study, a method of reducing the fuel cost that can improve the performance of the diesel engine was tried by introducing a predetermined amount (0.1~0.3% of the mass amount of fuel used) of hydrogen fuel additive. The experimental conditions of the test engine were 1500rpm and torque BMEP-10b ar. The engine performances (power output, fuel consumption rate, p-max, exhaust temperature) were compared before and after addition of hydrogen fuel additives. This experimental study confirmed reducing at least 2% fuel consumption and 2.19% NOx emission.

• 한국도로학회논문집
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• 제14권2호
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• pp.37-44
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• 2012

세계각국에서 홍수, 태풍과 같은 자연재해가 많이 발생하고 있다. 이러한 자연재해가 발생하는 원인으로는 지구온실가스 배출 증가에 따른 지구온난화 현상 때문이다. 지구온난화를 막기 위해, 많은 연구진들이 신재생에너지에 대한 연구를 진행하고 있다. 정부는 온실가스배출량을 감축하여 지구온난화를 막기위해 "저탄소 녹색성장"의 국가정책 하에서 신재생에너지와 같은 친환경적인 녹색산업에 많은 관심과 투자에 집중하고 있다. 연구팀들은 도로를 주행하는 차량으로부터 전달되는 역학전 에너지를 이용하여 신재생에너지를 생산하는 연구를 진행하고 있다. 본 논문에서는 압전세라믹의 크기와 연결방식에 따른 연구 결과를 나타내고 있다. 또한 실험변수에 따른 압전세라믹의 파워특성을 측정하여 분석을 하였다.

• Clinical and Experimental Reproductive Medicine
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• 제14권1호
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• pp.51-59
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• 1987

The present experiments have been bone to verify the effects of the warming rate and the degenerated blastomere(s) on further development of the frozen and thawed 4- and 8-cell mouse embryos. The embryos obtained from the mouse superovulated and mated were frozen in the solution of 15M DMSO in PBS containing 10% FCS at a slowly cooling rate($0.3^{\circ}C/min$). Two methods of warming slowly($8^{\circ}C/min$) and quickly ($450^{\circ}C/min$) were applied for thawing embryos. The thawed embryos were grouped according to the number of healthy blastomere(s) in the embryos. Some of the embryos were eliminated their degenerated blastomere(s) by means of a micromanipulation technique. The embryos were examined their developmental phases after 48 or 72 hrs incubation. The rates of blastocyst development from the frozen and thawed 4- and 8-cell embryos were 72.7% and 73.5%, respectively in case of thawing slowly, and were 78.9% and 80.0%, respectively in case of thawing quickly. The rate in case of thawing quickly was significantly higher than that in case of thawing slowly. The rates of blastocyst development from the frozen and thawed 4- and 8-cell embryos eliminated their degenerated blastomere(s) increased 5.9% and 24.4%, respectively compared with those of control groups not eliminated. The more number of degenerated blastomere(s) were eliminated from the embryos, the higher rate of blastocyst development was shown. It may be concluded from the results that the quickly thawing method is better for increasing survival rate than the slowly thawing one, and that the degenerated blastomere(s) in the frozen and thawed embryos affects as an interfering factor for further development of the embryos.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 1996년도 춘계 학술대회논문집
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• pp.131-136
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• 1996

The numerical method for the flow field of a gas atomization process is presented. For the analysis of the compressible supersonic jet flow of a gas. an axisymmetric Navier-Stokes equations are solved using a LU-factored upwind method. The MUSCL type TVD scheme is used for the discretization of inviscid flux, whereas Steger-Warming splitting and LU factorization is applied to the implicit operator. For the validation of the present method, we computed the flow field around the simple gas atomizer proposed by Issac. The numerical results has shown excellent agreement with the experimental data.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 가을학술발표대회논문집
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• pp.79-80
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• 2023

After the Second Industrial Revolution, as global warming caused by environmental issues has intensified, the CO₂ emissions from the cement industry have become an urgent challenge. Therefore, this study aimed to reduce and utilize CO₂ emissions by using CO₂-reducing Calcium Silicate Cement.