• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 2010년도 춘계학술 발표회
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• pp.65-65
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• 2010

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2002년도 International Meeting on Information Display
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• pp.1077-1080
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• 2002

Present status of diagnostics and simulations on microplasmas for understandings of the discharge and VUV emission characteristics in a unit cell of plasma display panel is overviewed and their future perspective will be argued towards potential improvement of the characteristics.

• 환경정책연구
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• 제8권1호
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• pp.1-30
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• 2009

교토의정서에서 저비용의 온실가스 저감 방안으로 도입된 온실가스 배출권 거래제도는 현재 유럽 배출권 거래 제도를 포함하여 다양한 규모와 지리적 범주를 가진 시장이 운영되고 있으며 우리나라를 비롯한 여러 국가에서 새로운 배출권 거래제도 도입을 계획하고 있다. 본 연구의 목적은 교토의정서를 기반으로 하는 배출권 시장과 자발적 배출권 시장에서 산림 관리 활동의 역할과 인정 범위를 조명하고, 국내 배출권 시장의 도입에 있어 산림부문 참여의 필요성을 고찰하는 것이다. 이를 위해 유럽연합 배출권 거래제도, 시카고 기후 거래소, 뉴사우스웨일즈 온실가스 감축제도, 지역 온실가스 이니셔티브의 사례를 분석하여 각 배출권 시장에서의 산림 흡수원 배출권의 역할과 인정범위를 분석하였다. 국내 배출권 시장에 있어 산림 흡수원 배출권의 포함은 비용절감과 감축활동 참여확대라는 이점과 함께 기술적 복잡성과 직접 감축노력의 감퇴라는 위험요소를 가진다. 하지만 위험요소에 대한 다양한 해법이 제시되고 있고 향후 기후변화협약 하에서 산림 흡수원의 범위와 규정에 대한 변화가 예상되며 국내 현실에서 온실가스 감축을 위한 다양한 접근이 필요한 만큼 산림 흡수원 배출권은 배출권 시장의 한 요소로 포함되어야 할 필요가 있다. 산림분야에 있어서 산림 흡수원 사업의 참여는 산업영역의 확대와 산림관리 재원의 마련이라는 기회를 제공하며 이러한 기회를 활용하기 위한 제도와 기술측면의 대비가 필요하다.

• 대한환경공학회지
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• 제34권4호
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• pp.280-287
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• 2012

본 연구에서는 대학 캠퍼스 단위에서의 온실가스 인벤토리 구축을 위해 한양대학교 안산캠퍼스를 대상으로 직접 배출원(도시가스, 실내등유, 이동연소), 간접 배출원(전력), 기타 배출원(항공, 수도) 세 부분으로 온실가스 배출원을 규명하였으며, 2007년부터 2009년까지 온실가스 배출원별 에너지 사용량에 따른 온실가스 배출량을 산정하였다. 그 결과, 전체 온실가스 배출영역 중 가장 많은 부분을 차지하는 것은 간접배출의 전력부문으로 전체 온실가스 배출량의 56.7% 차지하는 것을 확인하였다. 또한, 대학본부에서 수행 가능한 온실가스 감축시나리오 및 학교구성원이 수행 가능한 온실가스 감축 실천시나리오를 대학환경에 적합하게 설계한 후 LEAP 모델을 이용하여 2007년부터 2020년까지의 온실가스 감축잠재량을 평가하였다. 그 결과, 감축시나리오 적용시 2020년 BAU(배출전망치) 대비 2020년에는 직접배출 중 고정연소에서 63.34 ton $CO_{2eq}/yr$, 이동연소에서 221.1 ton $CO_{2eq}/yr$ 감축되었으며, 간접배출 중 조명에서는 4,637.34 ton $CO_{2eq}/yr$ 온실가스가 감축되는 것으로 산출되었다. 또한, 실천시나리오를 통한 온실가스 감축잠재량은 1293.76 ton $CO_{2eq}/yr$으로 산출되었다. 따라서, 한양대학교 안산 캠퍼스에 감축 실천 시나리오를 모두 적용한다면 2020년에는 2020년 BAU 대비 온실가스를 총 24% 감축할 수 있을 것으로 추정된다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.433-433
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• 2016

Carbon nanotubes (CNT) emitter has widely become an attractive mechanism that draws growing interests for cold cathode field emission. CNT yarns have demonstrated its potential as excellent field emitters. It was demonstrated that a small focal spot size was achieved by manipulating some electrical parameters, such as applied bias voltage at the mesh gate, and electrostatic focal lenses, geometrical parameters, such as axial distances of the anode, and the electrostatic focal lens from the cathode assembly, and the dimension of the opening of the electrostatic lens. Electrical-optics software was used to systematically investigate the behavior of the electron beam trajectory when the aforementioned variables were manipulated. The results of the experiment agree with the theoretical simulation results. Each variable has an individual effect on the electron beam focal spot size impinging on the target anode. An optimum condition of the parameters was obtained producing good quality of X-ray images. Also, MWCNT yarn was investigated for field emission characteristics and its contribution in the X-ray generation. The dry spinning method was used to fabricate MWCNT yarn from super MWCNTs, which was fabricated by MW-PECVD. The MWCNT yarn has a significant field emission capability in both diode and the triode X-ray generation structure compared to a MWCNT. The low-voltage-field emission of the MWCNT yarn can be attributed to the field enhancing effect of the yarn due to its shape and the contribution of the high-aspect-ratio nanotubes that protrude from the sides of the yarn. Observations of the use of filters on the development of X-ray images were also demonstrated. The amount of exposure time of the samples to the X-ray was also manipulated. The MWCNT yarn can be a good candidate for use in the low voltage field emission application of X-ray imaging.

• KIEAE Journal
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• 제8권4호
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• pp.19-27
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• 2008

The carbon dioxide is brought from the energy consumption and regarded as a criteria material to estimate the Global Warming Potential. Building shares about 30% in national energy consumption and affects to environment as much as the energy consumption. But there is not enough data to forecast the amount of the carbon dioxide during the maintenance stage. Various factors are related with the energy consumption and carbon dioxide emission such as the physical area, the building exterior area, the maintenance type and location. Among these factors, the building carbon-dioxide emission can be estimated by the overall building characteristics such as the maintenance area, the number of household, the heating type, etc., The physical amount such as the thickness of the insulation and window infiltration could explained the limited scope and might not be use to estimate the total carbon-dioxide emission energy because the each value could not include or represent the overall building. In this paper, it provided the estimation model of the carbon-dioxide emission, explained by the overall building characteristics. These factors are shown as the maintenance area, no. of household, the heating type, the volume of the building, the ratio of the window to wall area etc., For providing the estimation model of th carbon-dioxide emission, it conducted the corelation analysis to filter the variables and suggested the estimation model with the power model and multiple regression model. Most of the model have a good statistics and fitted in the curve line.

• 한국대기환경학회지
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• 제28권1호
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• pp.68-76
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• 2012

SULEV (Super Ultra Low Emission Vehicle) which is one of the emission standards in Fleet Average System introduced to Korea from 2009 is known as the most severe standard to achieve with internal combustion engine. Considering low sales volume of hybrid vehicles in Korea, vehicle manufacturers are required to develop SULEV technologies for conventional gasoline and LPG vehicles to meet the future Fleet Average standard. In this study, the comparison of emissions has been made between SULEV developed and ULEV LPG vehicles mainly produced in this time. To estimate the emission reduction of SULEV vehicles, CVS-75 and NIER test modes have been used. CVS-75 has been used for emission certification of gasoline and LPG vehicles. NIER modes cover various average vehicle speed and reflect Korean real driving patterns better than CVS-75. The test results show that SULEV LPG vehicles have very high potential to reduce $NO_x$ in regulated emissions, $N_2O$ in green house gases and toluene in VOCs. However, SULEV LPG vehicles don't affect much on the reduction of CO and total green house gases.

• 한국대기환경학회지
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• 제28권1호
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• pp.77-85
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• 2012

In this study, emission rates (ER) of biogenic volatile organic compounds (BVOCs) were measured by varying levels of photosynthetically active radiation (PAR). An appropriate plan for ozone reduction according to increasing ecology area ratio in future metropolitan areas was suggested. Several trees were selected as representative tree species in urban areas. Emission rates and composition ratios of monoterpene and isoprene emitted from these trees were estimated and compared. As a result, it was found that emission rates of BVOCs were considerably different depending on tree species. Especially, BVOCs emitted from Platanus orientalis and Quercus mongolica could significantly affect ozone increase in the metropolitan area, because the emission rates were several thousands to ten thousand times higher than those emitted from Zelkova serrata and Prunus serrulata. Furthermore, it was observed that emission rates of BVOCs by species increased maximum up to 10 times when PAR, which has close relations with temperature, rose. It was concluded that tree species such as Zelkova serrata et al., was appropriate for metropolitan areas since the species has low ozone potential and good landscape. Suppose this type of trees are planted on purpose in the urban areas, better ambient air quality will be promised in the future.

• 한국토양비료학회지
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• 제49권5호
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• pp.564-571
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• 2016

As the amount of rice straw collected increases, green manure crops are used to provide the needed organic matter. However, as green manure crops generate methane in the process of decomposition, we tested with different tillage depths in order to reduce the emission. The atmosphere temperature of the chamber was $25{\sim}40^{\circ}C$ during the examination of methane and soil temperature was $2{\sim}10^{\circ}C$ lower than air temperature. The redox potential (Eh) of the soil drastically fell right before irrigated transplanting and showed -300~-400 mV during the cultivating period of rice (7~106 days after transplant). When hairy vetch was incorporated to soil and the field was not irrigated, the generation of methane did not occur from 12 to 4 days before transplanting rice and started after irrigation. Regarding the pattern of methane generation during the cultivation of rice, methane was generated 7 days after transplanting, reached the pinnacle at by 63~74 days after transplanting, rapidly decreased after 86~94 days past transplanting and stopped after 106 days past transplanting. When tested by different soil types, methane emission gradually increased in loam and clay loam during early transplant, whereas it sharply increased in sandy loam. The total amount of methane emitted was highest in sandy loam, followed by loam and clay loam. In all three soil types, methane emission significantly reduced when tillage depth was 20 cm compared to 10 cm. The rice growths and yield were not affected by tillage depth. Therefore, reduction of methane emission could be achieved when application hairy vetch to the soil with tillage depth of 20 cm in paddy soil.

• 한국초지조사료학회지
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• 제41권4호
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• pp.280-286
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• 2021

The objective of this study was to prove the effect of pig slurry application with charcoal on nitrogen use efficiency (NUE), feed value and ammonia (NH₃) emission from maize forage. The four treatments were applied: 1) non-pig slurry (only water as a control), 2) only pig slurry application (PS), 3) pig slurry application with large particle charcoal (LC), 4) pig slurry application with small particle charcoal (SC). The pig slurry was applied at a rate of 150 kg N ha^-1, and the charcoal was applied at a rate of 300 kg ha-1 regardless of the size. To determine the feed value of maize, crude protein, dry matter intake, digestible dry matter, total digestible nutrient, and relative feed value were investigated. All feed value was increased by charcoal treatment compared to water and PS treatment. Also, the NUE for plant N was significantly higher in charcoal treatments (LC and SC) compared to PS treatment. On the other hand, there is no significant difference for feed value and NUE between LC and SC. The NH₃ emission was significantly reduced 15.2% and 27.9% by LC and SC, respectively, compared to PS. Especially, SC significantly decreased NH₃ emission by 15% compared to LC. The present study clearly showed that charcoal application exhibited positive potential in nitrogen use efficiency, feed value and reducing N losses through NH₃ emission.