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신재생에너지와 기후변화에 대한 장기간 인식조사가 갖는 함의
안중우,AHN, JOONG WOO 한국수소및신에너지학회 2018 한국수소 및 신에너지학회논문집 Vol.29 No.1
The long-term perception investigation of environment is needed for the persistence of each country's policy on climate change, which is greatly influenced by external factors. Long term data on perception and attitudes of people's thought can be a big data point for climate change and consistent policies can be implemented with the need for public demand. Information on the perception of the general public regarding the environment should be carried out as a basis for the national environmental policy.
안중우,김진국,Ahn, Joong Woo,Kim, Jin Kuk 한국자원리싸이클링학회 2018 資源 리싸이클링 Vol.27 No.1
This study conducted the Life Cycle Assessment(LCA) on waste rubber recycling technology for recovering rubber product from the waste tires. Environmental impacts were assessed for the five categories of impacts: global warming, resource depletion, acidification, eutrophication, photochemical oxide production, and ozone layer depletion. When recycling 1ton of waste tire containing rubber, global warming impact was 1.77E+02 kg $CO_2-eq.$, resource depletion impact was 1.23E+00 kg Sb-eq., acidification impact was 5.92E-01 kg $SO_2-eq.$, eutrophication impact was 1.23E-01 kg $PO{_4}^{3-}-eq.$, photochemical oxide production impact was 3.42E-01 kg $C_2H_4-eq.$, and ozone layer depletion impact was 1.87E-04 kg CFC11-eq. In terms of overall environmental impacts, carbon, softener and electricity the greatest impact, so it is necessary to compare the environmental impacts of the raw materials to replace carbon and softener, and a method to reduce the filler usage in the process is needed. In addition, it is necessary to improve energy efficiency, change to low-energy sources, and apply renewable energy.
안중우(Joong Woo Ahn),김경신(Kyung Shin Kim) 한국펄프·종이공학회 2018 펄프.종이기술 Vol.50 No.1
Recycling of disposable diaper can help to alleviate many of the problems associated with landfills and waste incinerators, such as ground water and air pollution. Along with the consideration of the environmental effects, technology, social acceptance, and economic feasibility also need to be taken into account in promoting the recycling of diaper. With respect to the environmental effect, the environmental enhancement of diaper recycling comparing to current disposal method need to be identified. This study validates that accurate statistical data on diaper generation, material information and usage should be collected to assess the environmental aspect quantification. Life cycle assessment was conducted to measure the environmental impact caused by the utilization of diaper recycling process. Since the environmental effects of diaper recycling are largely avoided by the regeneration of pulp and plastic, the environmental improvement effect is significantly higher than current disposal method considering the production of pulp and plastic. It was found that the improvement effect of 131% in terms of eutrophication and 185% in terms of resource depletion was shown to be improvement. For actual diaper recycling to be realized in the future, an additional study on the optimal size, location, and target rate needs to be carried out through a variety of pilot projects and an environmental analysis should be conducted based on actual operational data.
안중우 ( Joong Woo Ahn ),김영실 ( Youngsil Kim ),양인목 ( Inmog Yang ),이수정 ( Sujung Lee ),조봉규 ( Bong Gyoo Cho ),조영주 ( Youngju Cho ) 한국전과정평가학회 2015 한국전과정평가학회지 Vol.16 No.1
This study has been carried out to evaluate environmental values of a coal ash recycling technology and suggest directions for improving environmental performance of the recycling technology. As the results of comparing the global warming environmental impacts of 3 types of geopolymers produced by fly ash, middle ash, and bottom ash with the impact of portland cement, Fly ash geopolymer showed 19%, Middle ash geopolymer 51%, Bottom ash geopolymer showed 133% of the impact of portland cement. The impact of Bottom ash geopolymer can be improved by reducing water use and wastewater recycling. In the case of Fly ash geopolymer and Middle ash geopolymer, energy efficiency and sodium silicate input have been found as material factors. The limitation of this study is not to consider the value of new recycling material, additional burden of coal ash dumping, and low efficiency of small amount production of a development stage. It can be inferred that the actual environmental impact of geopolymers would be lower.
안중우 ( Joong Woo Ahn ),김대수 ( Daesoo Kim ),양인목 ( Inmog Yang ),조봉규 ( Bong Gyoo Cho ),조영주 ( Youngju Cho ) 한국전과정평가학회 2015 한국전과정평가학회지 Vol.16 No.1
There have been many studies estimating the environmental damage cost for different areas. However, most studies focused on environmental issues even with reflecting social and environmental value, but the results could not show comparable indicators. This study has been conducted to investigate the economic value of environmental impact based on the LCA six impact categories in order to compare their values, such as resource depletion, global warming, ozone depletion, acidification, eutrophication, and photochemical oxidant creation. The result shows KRW 11,408/kg Sb, KRW 26.65/kg CO2, KRW 139,970/kg CFC-11, KRW 2,599/kg SO2, KRW 15,253/kg PO4(3-), and KRW 3,030/kg C2H4.
폐 형광등으로부터 재생된 유가자원의 환경성과 및 경제적 가치에 대한 연구
안중우 ( Joong Woo Ahn ),양인목 ( Inmog Yang ),이승희 ( Seung-whee Rhee ),조봉규 ( Bong Gyoo Cho ),조영주 ( Youngju Cho ) 한국전과정평가학회 2016 한국전과정평가학회지 Vol.17 No.1
This study was conducted to figure out environmental performance and the performance based economic value in order to confirm the value and necessity on the recycling technology of spent fluorescent lights. The comparison result of environmental impact of recycled six materials shows 1.33% of resource depletion, 3.23% of global warming, 1.70% of human toxicity, respectively. The assessment results of economic value of the environmental performance correspond to 266,000won/ton for six impact categories except toxicity. In addition, the environmental impact of recycling process can be improved by yield and energy efficiency increase.
고산가 폐유지 재생 지방산 메틸에스테르와 식물유 지방산 메틸에스테르의 전과정 환경영향 비교
안중우 ( Joong Woo Ahn ),양인목 ( Inmog Yang ),최아란 ( Aran Choi ),임대재 ( Daejae Im ),조봉규 ( Bong Gyoo Cho ),조영주 ( Youngju Cho ) 한국전과정평가학회 2016 한국전과정평가학회지 Vol.17 No.1
This study has been conducted to evaluate environmental values of high acid value waste oil recycling technology and suggest improvement directions of the recycling technology. As the result of comparing with vegetable oil fatty acid methyl ester(FAME), total environmental impact of recycled FAME showed 96% of vegetable oil FAME. When considering each impact category, environmental impacts of recycled FAME appeared to 54%, 15%, 99% of resource depletion, global warming, and human toxicity. Reducing water usage and recycling waste water can lower the environmental impact of recycling process.
MOCVD 공정 중 발생한 GaN 분말 scrap에 대한 대기 산화가 결정조직과 미세조직에 미치는 영향
홍현선,안중우,Hong, Hyun Seon,Ahn, Joong Woo 한국분말야금학회 2015 한국분말재료학회지 (KPMI) Vol.22 No.4
The GaN-powder scrap generated in the manufacturing process of LED contains significant amounts of gallium. This waste can be an important resource for gallium through recycling of scraps. In the present study, the influence of annealing temperatures on the structural properties of GaN powder was investigated when the waste was recycled through the mechanochemical oxidation process. The annealing temperature varied from $200^{\circ}C$ to $1100^{\circ}C$ and the changes in crystal structure and microstructure were studied. The annealed powder was characterized using various analytical tools such as TGA, XRD, SEM, and XRF. The results indicate that GaN structure was fully changed to $Ga_2O_3$ structure when annealed above $900^{\circ}C$ for 2 h. And, as the annealing temperature increased, crystallinity and particle size were enhanced. The increase in particle size of gallium oxide was possibly promoted by powder-sintering which merged particles to larger than 50 nm.