• 한국조경학회지
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• 제51권6호
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• pp.75-87
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• 2023

본 연구는 조경·정원분야 기후변화 대응을 위한 역할로서 자연기반해법의 실증을 위한 실험적 설계를 제시하고, 탄소중립 사회를 위한 공간 전략적 방안과 문화 산업으로서의 역할을 제시하는 목적으로 진행되었다. 환경 보호와 탄소중립 사회 형성을 목표로 저 관리형 정원으로서의 탄소저감 효과를 위한 전략을 제시하고자 한다. 이를 위해 본 연구에서는 모델정원의 기능과 공간 요소, 탄소중립과 관련된 내용들을 보다 과학적인 데이터로 수집할 수 있도록 실질적 모델정원을 설계하고 조성하였다. 대상지는 국립세종수목원 내에 위치한다. 탄소저감 기능을 측정하는 실험구를 중심적으로 배치하며, 그 외 공간은 드라이가든과 커뮤니티 가든, 초화원 등으로 전시와 휴식을 할 수 있는 공간을 두었다. 실험구는 바이오차 부설 양, 식재밀도, 식재 수종에 따른 탄소저감 효과를 분석할 수 있게 타입을 구분하였다. 탄소저감을 위한 시설 적용과 시공 방식은 '지구를 위한 10가지 탄소정원 가꾸기'의 방식을 적용하였다. 대표적으로 빗물의 활용시설, 저탄소 인증 목재 활용, 인근지역 자재 사용을 적용하였다. 또한 각각의 시설 및 시공 방식에 따른 탄소저감 효과를 비교하여 제시하였다. 이 결과는 탄소중립 사회를 실현하기 위한 대응 방안을 모색하는 데에 중요한 기초 연구가 될 것으로 기대되며, 정원 산업 등 지속 가능한 발전이 필요한 다양한 분야에서의 참고가 될 것으로 기대한다.

• Journal of the Korean Wood Science and Technology
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• 제48권6호
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• pp.878-887
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• 2020

A neutral extract (NE), that is soluble in cold water and has excellent antioxidant activity, from Pinus radiata pine bark was prepared by sodium bicarbonate treatment, and its chemical characteristics were investigated. NE was prepared by treating P. radiata bark with 0.8% NaHCO₃ aqueous solution with a 5 : 1 liquor-to-bark ratio at boiling temperature for 1 h, resulting in 44% yield and final pH of 6.66. The yield of NE was 11% higher than that of the hot water extract (HWE) due to the increase in the solubility of polyphenols, the main component in the bark, by NaHCO₃ treatment. NE was characterized through FT-IR, NMR, and MALDI TOF MS analyses. The results indicated that NE is mostly composed of proanthocyanidins (PAs) consisting of procyanidin (PC) units. The acetylated neutral extract (Ac-NE) had weight average molecular weight (${\bar{M}}w$) of 5,300 Da. The Ac-NE had wide molecular weight distribution and its polydispersity (${\bar{M}}w/{\bar{M}}n$) was 6 times higher than that of pure PA. The antioxidant activity of NE was determined by 2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging assay and showed that NE had comparable antioxidant activity with pure PA.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2011년도 춘계학술대회 초록집
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• pp.94.1-94.1
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• 2011

In this work, ordered mesoporous carbons (OMCs) were prepared by the conventional templating method using mesoporous silica (SBA-15) for Pt-Ru catalyst supports in fuel cells. The influence of surface modification on carbon supports on the electrochemical activities of Pt-Ru/OMCs was investigated with different pH. The neutral-treated OMCs (N-OMCs), base-treated OMCs (B-OMCs), and acid-treated OMCs (A-OMCs) were prepared by treating OMCs with 2 M $C_6H_6$, 2 M KOH, and 2 M $H_3PO_4$, respectively. The surface characteristic of the carbon supports were determined X-ray photoelectron spectroscopy (XPS). The electrochemical activities of the Pt-Ru catalysts had been enhanced when the OMCs supports were treated by basic or neutral agents, while the electrochemical activities had been decayed for the A-OMCs supported Pt-Ru.

• 한국수소및신에너지학회논문집
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• 제34권3호
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• pp.316-326
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• 2023

Development of carbon-neutral fuel production technologies to solve climate change issues is progressing worldwide. Among them, methane can be produced through the synthesis of hydrogen produced by renewable energy and carbon dioxide captured through a CO₂ methanation reaction, and the fuel produced in this way is called synthetic methane or e-methane. The CO₂ methanation reaction can be conducted via biological or thermochemical methods. In this study, a 30 Nm³/h thermochemical CO₂ methanation process consisting of an isothermal reactor and an adiabatic reactor was used. The CO₂ conversion rate and methane concentration according to the temperature measurement results at the center and outside of the adiabatic reactor were analyzed. The gas flow into the adiabatic reactor was found to reach equilibrium after about 1.10 seconds or more by evaluating the residence time. Furthermore, experimental and analysis results were compared to evaluate performance of the reactor.

• 한국재료학회지
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• 제32권11호
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• pp.496-507
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• 2022

For the selective catalytic reduction of NOx with ammonia (NH₃-SCR), a V₂O₅WO₃/TiO₂ (VW/nTi) catalyst was prepared using V₂O₅ and WO₃ on a nanodispersed TiO₂ (nTi) support by simple impregnation process. The nTi support was dispersed for 0~3 hrs under controlled bead-milling in ethanol. The average particle size (D₅₀) of nTi was reduced from 582 nm to 93 nm depending on the milling time. The NOx activity of these catalysts with maximum temperature shift was influenced by the dispersion of the TiO₂. For the V_0.5W₂/nTi-0h catalyst, prepared with 582 nm nTi-0h before milling, the decomposition temperature with over 94 % NOx conversion had a narrow temperature window, within the range of 365-391 ℃. Similarly, the V_0.5W₂/nTi-2h catalyst, prepared with 107 nm nTi-2h bead-milled for 2hrs, showed a broad temperature window in the range of 358~450 ℃. However, the V_0.5W₂/Ti catalyst (D₅₀ = 2.4 ㎛, aqueous, without milling) was observed at 325-385 ℃. Our results could pave the way for the production of effective NOx decomposition catalysts with a higher temperature range. This approach is also better at facilitating the dispersion on the support material. NH₃-TPD, H₂-TPR, FT-IR, and XPS were used to investigate the role of nTi in the DeNOx catalyst.

• 한국가스학회지
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• 제27권1호
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• pp.70-77
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• 2023

인체의 건강과 환경 오염으로 인해 대기환경 규제가 강화되었고 배출가스 저감 목표가 높아지면서 가스 측정법에 관한 관심이 늘어나고 있다. 측정법에는 표본 방식이 주로 사용되고 있으나 공간적 시간적 측정 한계로 인해, 실시간 In-situ 방식인 레이저 흡수분광법이 주목받고 있다. 본 연구에서는 파장 변조 분광법을 연구하였고 무보정 알고리즘에 대하여 설명하였다. 개발된 알고리즘은 46개의 다중 흡수선을 반영할 수 있도록 변경하였고 가시광선과 중적외선 영역의 광 흡수 신호 분석에 적용하였다. 추가로 레이저 변조 매개변수에 대한 차이를 분석하였고 다양한 농도 조건의 O₂, NO 가스 측정 실험을 통해 성능을 검토한 결과, 선형성은 R²_O2=0.99999, R²_NO=0.99967로 나타났다.

• 한국결정성장학회지
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• 제33권2호
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• pp.54-60
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• 2023

본 연구에서는 탈황석고(DG)에 이산화탄소를 반응시켜 만든 탄산화물(CCMs)의 시멘트 혼합재로서 적용 가능성 분석을 위해 탈황석고와 탄산화물의 미세구조 및 기초물성 분석을 실시하였다. 탈황석고의 경우 CaO 및 CaSO₄가, 탄산화물의 경우 CaSO₄, CaCO₃, Ca(OH)₂ 및 CaSO₄·H₂O 결정상이 주 결정상으로 나타났으며 입도분석 결과 두 재료의 평균 입자 크기의 차이는 약 7 ㎛로 나타났다. 또한 탄산화물은 폐기물공정시험기준에 따른 중금속 용출시험 결과 주요 중금속이 불검출되었으며 열중량 분석 결과 탈황석고에 비해 CO₂ 분해가 2배 이상 나타난 것으로 보아 설비 운전 조건 최적화를 통해 건설 소재 원료로 활용 가능할 것이라 판단된다. 탈황석고와 탄산화물의 함량별 강도 거동 측정 결과 탄산화물 혼입 모르타르의 장기강도가 더 높은 것으로 나타났으며 이는 탄산화물에 존재하는 CaCO₃의 충전제 효과 때문인 것으로 나타났다.

• KIEAE Journal
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• 제13권2호
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• pp.131-139
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• 2013

The aim of this dissertation is establishing internal indicator list for achieving policy goal of Carbon Neutrality Green City. First of all, it started to construct the basic system of planning indicator based on through comprehension of current studies such as advanced researches, government guidelines and green building certifications. And then it was set up final indicator list through inspecting FGI (Focus Group Interview), Verification of suitability, and Analysis of importance). As a result of this research, the planning indicator divided three steps and there were classified four fields in the top-level; Green Land and Ecology, Green Energy, Green Resource and Transportation, Green Living and Institution. According to the data, it deducted four items (ratio of green land, site plan, heat island and management of climate, base of nature ecology) and twelve index in the field of green land and ecology, three item(energy conservation and self-supporting, energy efficiency, new regeneration energy) and twelve index in the field of green energy and regeneration, five items(water resources utilize and circulation, other resource reduction and circulation, public transportation, green transportation plan) and fifteen index. Totally, Planning Indicators of forty nine were deducted. Therefore, there was the result of importance analysis that the indicators of plan and maintain management as the side of space for carbon neutrality were more appreciated than carbon reduction of individual building.

• 자원ㆍ환경경제연구
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• 제19권1호
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• pp.45-80
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• 2010

본 연구는 우리나라의 기후변화 대응 정책 입안에 있어 조세중립적 세제개편을 통한 탄소세의 도입에 따른 이중배당가설이 성립하는지를 연산가능일반균형모형을 이용하여 검토해 보았다. 법인세율 감경과 법정복리비 감경을 통한 조세중립적 세제개편과 병행한 탄소세 도입을 실험하여 본 결과, 우리나라의 경우 소득의 척도로 이중배당 효과를 측정할 때, 두 경우 모두 약이중배당 효과가 발견되고 있다. 그러나 소비 척도로 측정한 이중배당 효과는 법인세 감경을 통한 조세중립적 탄소세 도입의 경우 이중배당 효과가 전혀 나타나지 않았으며, 고용으로 측정한 이중배당 효과는 법정복리비 감경을 통한 조세중립적 탄소세 도입을 할 경우 강이중배당 효과도 발견되었다.

• 한국안전학회지
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• 제39권1호
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• pp.27-32
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• 2024

This study analyzed cases of hydrogen (H₂) and natural gas (CH₄) leakage from a hydrogen-blended natural gas pipeline to determine a range of leakage characteristics, including leakage type, pipe material, pipe diameter, pressure, and damage size. Based on the results of this analysis, five hydrogen-blended natural gas leakage scenarios were selected. The national vision for a carbon-neutral society by 2050 is a very important strategic objective and promotes environmentally sustainable economic development in the age of the climate crisis. Accordingly, zero-carbon and low-carbon policies are being promoted in various fields, including energy production, consumption, and industrial processes. Hydrogen-blended natural gas is eco-friendly and is considered an important step towards carbon neutrality, with various countries including the United States and several European countries conducting empirical research to further investigate its potential. In Korea, a national research project commenced in April 2023 to verify and demonstrate the life cycle safety of blending hydrogen into the natural gas network. The results of this study will provide important data for the analysis of the damage impacts caused by the leakage of hydrogen-blended natural gas, such as the diffusion of gas clouds, fires, and gas explosions.