• 한국수소및신에너지학회논문집
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• 제20권3호
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• pp.224-231
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• 2009

The improvement of cold start capability is one of the most challenging tasks to be solved for commercialization of fuel cell vehicle. In this study, cold start test and ice blocking test(IBT) of fuel cell stack were carried out under various operating conditions. This fuel cell stack can be thawed from -20$^{\circ}$C within 25s and the voltage change was found to be comprised of 4 steps; the first step is the voltage decrease by overpotential, the second step is the voltage increase by the cell temperature increase, the third step is the voltage decrease by ice blocking, and the last step is the voltage increase by thawing. Bootstrap startup was failed after shutdown at temperature under 40$^{\circ}$C because of much condensed water in the fuel cell. Quantitative estimation of cold start capability have been demonstrated by ice blocking test(IBT). In the results, it was found that cold start capability was improved double every 10$^{\circ}$C from 30$^{\circ}$C to 65$^{\circ}$C and enhanced by 30% at the condition of SR 3/4 compared to SR 1.5/2.0 and enhanced by 20% with dry purge condition compared to with RH 50% purge condition.

• 한국수소및신에너지학회논문집
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• 제20권3호
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• pp.208-215
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• 2009

PEMFC stack power output is needed to be around 100 kW to meet the requirements of automotive application and scaling-up the active area of the stack cells will allow a higher power. In the case of scaling-up the active area of cells, it is difficult to obtain uniform in-plane internal conditions such as temperature, relative humidity and stoichiometry of the feed gas. These ununiformity with the location in the cell would affect both the performance and durability of the stack, so it is important to understand phenomena in the cell for improving them. In this study, the current density, electrochemical resistance and performance distribution measurement was performed to understand the ununiformity in a single cell using in-situ method; (1) Current Density Distribution (CDD) Device and (2) Segmented Cell Fixture. The influence of location of feed gas on the performance of a single cell was experimentally measured and discussed by using a segmented single cell which was composed of 8 compartments. The correlation between the location and performance in a single cell was discussed by these two tools and it was extended between the local characterization and the durability in a MEA by comparing the used cell with a fresh one. It was also studied in terms of electrochemistry by Electrochemical Impedance Spectroscopy.

• KIEAE Journal
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• 제17권2호
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• pp.13-20
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• 2017

Meteorological data is one of the important factors in the calculation of building energy demand. The purposes of this study are to review the limitations of the typical meteorological data of ECO2 program and to create the new typical meteorological data and then analyze the building energy demands for additional regions which are not included in the existing 13 region in the ECO2 program. The extended typical meteorological data to a total of 33 regions were based on IWEC(International Weather for Energy Calculations) data files and were created in the form applicable to the building energy efficiency rating certification system. As a result of comparing the heating energy demands of a representative region with the surrounding regions in each of five regions in Korea, the variance of Cv(RMSE) ranged from 36% to 344% and MBE ranged from -32% to 190% for the whole regions. This suggests that the difference of heating energy demand may vary greatly depending on the region where the meteorological data is used and the meteorological data of more detailed regions is needed for reliable calculation of building energy demand.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2004년도 추계학술발표회 논문집
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• pp.5-27
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• 2004

• 대한설비공학회지:설비저널
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• 제44권9호
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• pp.22-32
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• 2015

• 건축사
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• 통권594호
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• pp.46-53
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• 2018

• 한국융합학회논문지
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• 제9권7호
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• pp.285-291
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• 2018

본 연구의 목적은 미용기업의 친환경 경영활동과 소비자 의사결정의 관계를 분석하는 것에 있다. 본 연구는 미용기업을 이용하는 소비자를 대상으로 한 설문지 355부의 자료를 SPSS v.18.0 통계 패키지 프로그램을 활용하여 분석하였다. 분석결과 친환경 경영활동의 속성은 에너지 절약, 지역사회공헌, 친환경 서비스 3개의 요인으로 구분 되었고 소비자의사결정의 속성인 구매의도, 구매평가, 재구매 3개의 요인에 통계적으로 유의미한 정(+)의 영향을 미치는 것으로 나타났다. 본 연구의 결과 소비자 의사결정에 있어서 미용기업의 친환경 경영활동이 기업의 성공적인 마케팅 전략에 중요한 요소임을 알 수 있었다. 본 연구는 미용기업의 친환경 경영활동을 유형화하여 연구한 점에서 의의가 있다고 할 수 있다. 본 연구를 통해 향후 미용기업의 친환경 경영활동에 친환경제품사용, 친환경정보의 제공, 친환경적인서비스를 마케팅 요소로 활용한다면 성공적인 마케팅 효과를 기대할 수 있을 것이다.

• 대한토목학회논문집
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• 제33권3호
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• pp.1253-1260
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• 2013

에코타운은 지속가능개발의 새로운 형태로서 전 세계적으로 많이 진행되고 있다. 미래개발방향의 한 과제로 지속가능개발이 추구하고 있는 목표를 수용하면서 또한 지역개발목표를 달성하고자 하며, 최근에는 에코타운은 지속가능개발이 목표로 하는 효율적 에너지 관리, 기후변화대응, 및 사회경제적 발전을 기저에 함유하고 있다. 본 논문은 에코타운을 네 가지 형태로 분류하여 각각의 특징과 전략을 사례를 중심으로 분석하였고, 이를 기초로 각 사례의 특징을 기술하였으나, 사업과 사업지의 특성에 따라 여러 분류에 속하는 사례도 있었다. 결론적으로 본 논문에서 제시한 분석형태를 기초로 국내 및 국제 에코타운사업의 전략과 추진을 설정하는 데 기여할 수 있다고 사료된다.

• International Journal of Advanced Culture Technology
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• 제12권1호
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• pp.254-261
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• 2024

Among eco-friendly energy, solar energy is one of the renewable energy sources that is developing in the spotlight in many countries. In line with this, the Korean government and local governments are carrying out projects to provide subsidies for the distribution of household solar power, raising the spread of household solar power and awareness. However, due to the lack of research on consumer perception of household solar power, this study investigated the perception of household solar power from 2015 to 2022 by setting the central word as solar power. As a result, 2016 had the highest number of collections, and when the top 50 words for each year were analyzed, it was confirmed that words related to the installation and maintenance of household solar power dominated. And through CONCOR analysis, a total of four were derived: solar energy recognition, renewable and eco-friendly energy recognition, solar government policies, solar companies, and perceptions of households. Through emotional analysis, it was confirmed that 2021 had the most positive data. As a result, consumer perception of household solar power is positive based on what was mentioned above, but research on how to use negative opinions on waste control and installation and maintenance should be conducted.

• 한국수소및신에너지학회논문집
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• 제31권1호
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• pp.57-64
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• 2020

The water-gas shift reaction for the compact reformer was carried out at a gas hourly space velocity of 72,152 h^-1 over the Cu-Nb-CeO₂ catalysts prepared by co-precipitation method. In order to investigate the effect of Nb₂O₅ promotion over a Cu-CeO₂ catalyst, the Nb₂O₅ loading amount was systematically changed from 0 to 5 wt.%. Among the prepared catalysts, the Cu-Nb-CeO₂ (1%) catalyst showed the highest catalytic activity (CO conversion=61% at 400℃) as well as 100% CO₂ selectivity. The high activity and stability of Cu-Nb-CeO₂ (1%) catalyst are correlated to high Brunauer-Emmett-Teller surface area, small metallic Cu crystallite size, and enhanced redox property.