• 한국분무공학회지
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• 제26권2호
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• pp.88-95
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• 2021

This study aims to investigate the influence of the droplet volume on the evaporation characteristics of the sessile droplet. In particular, the effect of the free convection in the vapor domain on the evaporation rate was analyzed through the numerical simulation. The commercial code of the ANSYS Fluent (V.2020 R2) was used to simulate the heat transfer in the liquid-vapor domain. Moreover, we used the diffusion model to estimate the evaporation rate for the different droplet volume under the room temperature. It was found that the evaporation rate significantly increases with the droplet volume because of the larger surface area for the mass transfer. Also, the effect of free convection on the evaporation rate becomes significant with an increment of droplet volume owing to the increase in the droplet radius corresponding to the characteristic length of the free convection.

• 한국어류학회지
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• 제32권4호
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• pp.239-244
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• 2020

마이크로네시아의 축 주변해에서 채집한 치어(체장 7.8 mm)의 형태적 특징은 체장과 지느러미의 발달단계를 제외하면 Omosudis sp.와 매우 유사하였다. 이 표본을 12S rRNA 마커를 이용하여 홍메치목의 Omosudis lowii로 동정하였다. 분자마커로 동정된 Omosudis lowii 치어의 형태적 특징은 이 종의 자치어 동정에 매우 유용할 것이다.

• 한국기후변화학회지
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• 제8권1호
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• pp.41-50
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• 2017

As serious consequences of climate change became indisputable, vehicles based on fossil fuel has to be shifted toward more sustainable way to drastically reduce carbon emissions. Eco-friendly vehicles contribute mitigating climate change through reducing the greenhouse gas emissions. The goal of this research is to find ways to promote the eco-friendly vehicle industry in Korea. In order to achieve this goal, surveys are collected from the professionals of eco-friendly vehicle industry, and analyzed through Delphi method. Results show that the first thing is to promote the eco-friendly vehicle market by introducing the economic incentives. The second thing is to allow more emission credit for eco-friendly vehicle manufacturers. The third thing is to build more concrete infrastructure for the eco-friendly vehicles. The increase of the number of the electric or hydrogen charging system would be one of the good examples of the infrastructure. The fourth thing is that the government supports the research & development of eco-friendly vehicles. The fifth is to regulate that the government agency is mandatory to use the eco-friendly vehicles. The sixth thing is to provide the low-carbon certification for eco-friendly vehicles. The seventh thing is to support advertising the eco-friendly vehicles. The results from this research can be used as a guideline to make policies to stimulate the eco-friendly vehicle industry in Korea.

• 비교문화연구
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• 제19권
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• pp.359-388
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• 2010

This study is aimed to investigate the aspect of using relative clauses in Korean. The data used for this study were extracted from the Korean text books for the foreign students and from the Chinese students' Korean compositions. They are the learners of Korean language at the early intermediated stage. As the result of analyzing them, the followings were found I)the majority of relative clauses in Korean consists of left-branching sentences. ii)The number of the subject relative clauses was higher than object ones in both of them. Especially in the aspect of using relative clauses, subject ones were used even more frequently than objective ones. This result is corresponded to the previous thesis, "the subject relative clauses was acquired earlier than object ones". iii)The relative clauses that those with a head noun function as subject in the main sentence showed in higher proportion in comparison of those as object. That is, this study showed that subjects were used more frequently than objects in the relative clauses used in their compositions. Finally, this study analyzed the errors of adnominal ending usage occurring in their compositions. More errors occurred when adjective form ended with '-hada' are changed into adnominal ending one.

• 한국기후변화학회지
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• 제7권2호
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• pp.111-120
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• 2016

In this study, Techno-economic evaluation model for carbon capture & sequestration (CCS) technologies are reviewed. Based on a key parameters of Korea's electricity market, performance data of 10 MW-scale post-combustion $CO_2$ capture pilot plant in Boryong station, the cost of $CO_2$ avoided was evaluated followed by international guideline suggested by IEA CCS costing methods task force. The result showed that Korea's Electricity cost including CAPEX & OPEX of reference power plant is relatively low compared to OECD nations which lead to a lower CCS cost ($33USD\;t/CO_2$). And future work using newly evaluated CAPEX & OPEX data of power plant with/without CCS is recommended.

• 한국기후변화학회지
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• 제7권4호
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• pp.507-512
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• 2016

This study was conducted to classify agroclimatic zones in South Korea. To classify the agroclimatic zones, such climatic factors as amount of rainfall from April to May, amount of rainfall in October, monthly average air temperature in January, monthly average air temperature from April to May, monthly average air temperature from April to September, monthly average air temperature from December to March, monthly minimum air temperature in January, monthly minimum air temperature from April to May, Warmth Index were considered as major influencing factors on the crop growth. Climatic factors were computed from monthly air temperature and precipitation of climatological normal year (1981~2010) at 1 km grid cell estimated from a geospatial climate interpolation method. The agroclimatic zones using k-means cluster analysis method were classified into 6 zones.

• 철학연구
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• 제116권
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• pp.133-154
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• 2010

신념과 같은 심성을 모두 제거하고자 하는 점에서 반직관적인 제거주의에 대한 반대자들은 이 신조가 자기반박적이라고 말했다. 이런 자기반박성 논증에 대한 반론 가운데 램지(William Remsey)의 반론은 가장 상세하며, 성립한다면 결정적인 반론에 속한다. 그는 자기반박성 주장이 실은 전형적인 제거주의에 대한 비판에 지나지 않아서 진정한 자기반박성 논증이 아니며 그래서 성공하지 못했거나, 진정한 자기반박성 논증이라 하더라도 특별히 제거주의만의 단점이 아니기에 성공을 거두지 못했다고 하면서, 제거주의를 자기반박성의 부담에서 벗어나게 하고자 시도했다. 하지만 램지의 이 시도 역시 성공하지 못했다. 그는 단순한 의미론적 전략을 사용하였을 뿐이다. 그의 자기반박성 개념은 너무 좁다. 그렇지만 램지의 논증과정을 검토하다 보면, 맥키(J. L. Mackie)의 화용적 자기반박성이 중요한 역할을 한다는 점이 드러난다. 어떤 형태의 자기반박성이든 화용적 자기반박성에 기반하고 있다. 여기서는 바로 이점에 착안하여 자기반박성에 관한 단순한 해석을 지지하고, 이에 대한 단순한 반박이 충분한 반박을 이라고 논증할 것이다.

• 대한소화기학회지
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• 제72권5호
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• pp.262-266
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• 2018

Surgery has been the standard treatment for perforated duodenal ulcers, with mostly good results. However, the resolution of postoperative leakage after primary repair of perforated duodenal ulcer remains challenging. There are several choices for re-operation required in persistent leakage from perforated duodenal ulcers. However, many of these choices are complicated surgical procedures requiring prolonged general anesthesia that may increase the chances of morbidity and mortality. Several recent reports have demonstrated postoperative leakage after primary repair of a perforated duodenal ulcer treated with endoscopic insertion using a covered self-expandable metallic stent, with good clinical results. We report a case with postoperative leakage after primary repair of a perforated duodenal ulcer treated using a covered self-expandable metallic stent.

• 에너지공학
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• 제27권4호
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• pp.92-97
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• 2018

본 연구는 자동차 엔진룸 내부에서 엔진과 연계된 부품의 냉각효과를 높이기 위해 후드 개발을 위한 수치해석을 다루고 있다. 급격한 온도편차에서 유발되는 엔진룸내 부품 온도를 저감시키면 부품에 대한 내구성 저하를 최소화 할 수 있다. 따라서, 본 연구에서는 차량 엔진룸 주요 부품 중에서도 온도제어가 비교적 용이한 발전기, 배터리, ECU 및 파워스틸 오일 등 4가지 부품을 목표로 엔진룸 냉각용 후드 개발을 위한 수치해석을 수행하였다. 그리고 수치해석을 검증하기 위하여 수치해석에서 가정하였던 동일한 조건으로 실험을 수행하여 비교하였다.

• 여성건강간호학회지
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• 제24권4호
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• pp.404-413
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• 2018

Purpose: To examine the applicability of a team-based learning using reflection journal in Women's Health Nursing for nursing students. Methods: This study had a nonequivalent control group non-synchronized design. Participants were 140 third-year undergraduate nursing students who agreed to participate in this study. The experimental group (n=70) received twice team-based learning using reflection journal about pregnancy nursing course while the control group (n=70) received only team-based learning. Data were analyzed with descriptive statistics, $x^2$ test, Fisher's exact test, and independent t-test using SPSS 23.0 program. Results: Compared to the control group, the experimental group reported significant positive changes in critical thinking (t=2.03, p=.044). Problem-solving, self-leadership, or academic self-efficacy of nursing college students was not significantly different between the two groups. Conclusion: Team-based learning using reflection journal is an effective teaching strategy to enhance critical thinking of nursing students.