• Journal of Advanced Marine Engineering and Technology
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• v.27 no.7
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• pp.845-851
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• 2003

The purpose of this experimental study is to investigate the quantitative pollutants reduction by oxygen enrichment and induced air effect in venturi type after-burner. For this purpose, CO, $CO_2$, $O_2$. and HC concentrations were measured before and after the after-burner by changing the Oxygen flow rate and area ratio which is defined as the ratio of air inducing area divided by total area. As results of this study, when the area ratio were increased, the emission reduction effect was increased even less oxygen flow rate. In that case when oxygen was injected too little, the pollutants were increased.

• Proceedings of the KIPE Conference
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• 2010.07a
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• pp.263-264
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• 2010

본 논문에서는 동일한 전압, 전류 위상을 갖는 2개의 트랜스포머를 1개의 트랜스포머로 집적화하여 부피저감 효과를 갖는 IM 트랜스포머를 제안한다. 제안한 IM 트랜스포머는 하프브릿지 및 풀 브릿지 타입의 컨버터, 인버터에서 승압, 감압 및 절연을 위한 트랜스포머를 2개 이상 사용하는 경우에 하나의 트랜스포머로 집적화하여 외족 코어에서 자속을 상쇄시켜 코어부피가 저감되는 효과가 있다. 제안된 IM 트랜스포머는 이론적으로 분석하여 Gyrator model을 통해 모의실험 및 시작품 제작하여 46인치 LCD TV용 인버터에 적용하여 실험을 통해 우수성을 검증하였다.

• Journal of the Korean Society of Marine Environment & Safety
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• v.27 no.7
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• pp.1074-1081
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• 2021

Nitrous oxide (N₂O) is one of the six major greenhouse gases and is known to produce a greenhouse ef ect by absorbing infrared radiation in the atmosphere. In particular, its global warming potential (GWP) is 310 times higher than that of CO₂, making N₂O a global concern. Accordingly, strong environmental regulations are being proposed. N₂O reduction technology can be classified into concentration recovery, catalytic decomposition, and pyrolysis according to physical methods. This study intends to provide information on temperature conditions and reaction time required to reduce nitrogen oxides with cost. The high-temperature ranges selected for pyrolysis conditions were calculated at intervals of 100 K from 1073 K to 1373 K. Under temperatures of 1073 K and 1173 K, the N₂O reduction rate and nitrogen monoxide concentration were observed to be proportional to the residence time, and for 1273 K, the N₂O reduction rate decreased due to generation of the reverse reaction as the residence time increased. Particularly for 1373 K, the positive and reverse reactions for all residence times reached chemical equilibrium, resulting in a rather reduced reaction progression to N₂O reduction.

• Journal of Advanced Marine Engineering and Technology
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• v.35 no.8
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• pp.1035-1040
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• 2011

In this study, many researches have been carried out against Energy Efficiency Operational Indicator(EEOI) of existing ships under discussion by IMO. This research is examined the method for the polices about IMO's greenhouse gas reducing emissions among them, we were analyzed the EEOI for existing ships. we have analyzed the result about applying EEOI using the calculation method of the rate of fuel consumption for cargo quantities to the actual existing ships and raised the problem. Based on this research, we were presented the improved EEOI about the engine load using fuel consumption and applied the existing ships. As a result, we concluded that the improved EEOI can define a resonable rate of $CO_2$ emissions.

• Proceedings of the Korea Society for Energy Engineering kosee Conference
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• 2003.11a
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• pp.217-222
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• 2003

• Proceedings of the Korean Institute of Landscape Architecture Conference
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• 2010.03a
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• pp.69-72
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• 2010

• Cement Symposium
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• s.36
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• pp.7-13
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• 2009

• Journal of Environmental Health Sciences
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• v.44 no.6
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• pp.599-607
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• 2018

Objectives: Carbon dioxide ($CO_2$) may be one of the biggest causes of climate change. The purposes of this study were to reduce greenhouse gases and to increase strawberry production by developing the supply devices in livestock facilities using the membrane technology Methods: Carbon dioxide was collected from beside to livestock facilities. The injection of $CO_2$ was stopped when it reached 1,000 ppm in the facility house. Case group with injection of $CO_2$ was compared to control group with normal environment. The experiments were conducted for 8 days from December 11, 2017. Results: Total strawberry production was found to be 1,317 kg in the case group and 1,176 kg in the control group. The correlation between $CO_2$ and crop yields has led to some statistical evidence that carbon dioxide helps to grow (${\beta}=0.832$, p<0.05). Conclusions: This study identified the potential for efforts to reduce the $CO_2$ in farming households. Increased concentrations of $CO_2$ have shown that strawberries have a better growth condition. In addition, it can be explained that the plants need wide leaves to quickly absorb much $CO_2$.

• Journal of Information Technology Services
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• v.12 no.2
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• pp.73-84
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• 2013

The development of the information on the internet brought a lot of changes in the real estate market. Because the real estate has local distinctiveness and individuality household who want to move must to visit place for housing information. But now household use internet real estate information at every decision-moving step and that is able to reduce not only the cost of real estate information but also social benefit like $CO_2$ emissions reduction effect. In this study, I analyzed the effect of $CO_2$ emissions reduction with Seoul household residential mobility data when household take informations from internet real estate site. As increasing a single family who is good at internet service, the effect of $CO_2$ reduction from the development of the Internet real estate information has more increased.

• Proceedings of the Korean Vacuum Society Conference
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• 2013.08a
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• pp.71.2-71.2
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• 2013

천연가스를 화학적 전환에 의해 부가가치를 높이기 위해서는 리포밍에 의해 합성가스(CO/H2)를 경유하는 간접전환경로가 현재로서는 가장 현실적인 방법이라 할 수 있다. 천연가스를 이용한 합성가스 제조기술은 수증기개질법(SRM), 이산화탄소 개질법(CDR, dry reforming), 부분산화법, 촉매 부분 산화법, 자열개질법 등으로 구분되며, 최근에는 각각의 제조방법의 장점을 고려하여 혼합개질법 또는 일련의 리포머 조합 방법이 개발되고 있다. CDR은 촉매 하에서 메탄과 이산화탄소의 직접접촉에 의해 반응이 일어나며, 수소와 일산화탄소의 비가 같은 합성가스가 제조된다. SRM에 비하여 고온에서 반응이 일어나고 전환율이 더 낮으므로 에너지 소비가 상대적으로 높다. 하지만, SRM과 함께 사용하면 합성가스 비율을 F-T합성이나 메탄올 합성에 적절한 비율로 조절이 가능한 장점이 있으며, 온실가스를 저감시킬 수 있는 전환기술로도 각광받고 있다. 본 발표에서는 최근의 CDR을 이용한 가스로부터 합성석유(GTL)와 메탄올을 고효율로 생산하는 기술 개발 동향에 대해서 소개하고자 한다.