연구용 원자로의 노심 열출력 불확실도 평가

이선일 한국에너지학회 2017 한국에너지공학회 학술발표회 Vol.2017 No.9

Effect of the Application of Carbonized Biomass from Crop Residues on Soil Chemical Properties and Carbon Pools

이선일,박우균,김건엽,최용수 한국토양비료학회 2015 한국토양비료학회지 Vol.48 No.5

Objective of this study was to investigate the effect of carbonized biomass from crop residues on chemical properties of soil and soil carbon pools during soybean cultivation. The carbonized biomass was made by field scale mobile pyrolyzer. A pot experiment with soybean in sandy loam soil was conducted for 133 days in a greenhouse, by a completely randomized design with three replications. The treatments consisted of four levels including the control without input and three levels of carbonized biomass inputs of 9.75 Mg ha-1, C-1 ; 19.5 Mg ha-1, C-2 ; 39 Mg ha-1, C-3. Soil samples were collected and analyzed pH, EC, TC, TN, inorganic-N, available phosphorus and exchangeable cations of the soils. Soil pH, Total-N and available phosphorus contents correspondingly increased with increasing the carbonized material input. The contents of soil carbon pools were 19.04 Mg C ha-1 for C-1, 26.19 Mg C ha-1 for C-2, 33.62 Mg C ha-1 for C-3 and 12.01 Mg C ha-1 for the control at the end of experiment, respectively. Increased contents of soil carbon pools relative to the control were estimated at 7.03 Mg C ha-1 for C-1, 14.18 Mg C ha-1 for C-2 and 21.62 Mg C ha-1 for C-3 at the end of experiment, respectively, indicating that the soil carbon pools were increased with increasing the input rate of the carbonized biomass. Consequently, it seems that the carbonized biomass derived from the agricultural byproducts such as crop residues could increase the soil carbon pools and that the experimental results will be applied to the future study of soil carbon sequestration.

Effect of the Application of Carbonized Biomass from Crop Residues on Soil Organic Carbon Retention

이선일,박우균,김건엽,신정두 한국토양비료학회 2014 한국토양비료학회지 Vol.47 No.6

This study was conducted to investigate the effect of carbonized biomass from crop residues on soil carbonstorage during soybean cultivation. The carbonized biomass was made by field scale mobile pyrolyzer. Thetreatments consisted of control without input and three levels of carbonized biomass inputs as 59.5 kg 10a-1,C-1 ; 119 kg 10a-1, C-2 ; 238 kg 10a-1, C-3. Soil samples were collected during the 113 days of experimentalperiods, and analyzed soil pH and moisture contents. Soil carbon contents and soybean yield were measured atharvesting period. For the experimental results, soil pH ranged from 6.8 to 7.5, and then increased withincreasing carbonized material input. Soil moisture contents were slightly higher by 0.1~1.5% than thecontrol, but consistent pattern was not observed among the treatments. Soil carbon and organic carboncontents in the treatments increased at 24 and 15% relative to the control at 15 days after sowing, respectively. Loss rate of SOC (soil organic carbon) relative to its initial content was 7.2% in control followed by C-1,6.8> C-2, 3.5>C-3, 1.1% during the experimental periods. The SOC change rate decreased with increasingcarbonized biomass rate. It was appeared that soybean yields were 476.9 kg 10a-1 in the control, and rangedfrom 453.6 to 527.3, kg 10a-1 in the treatments. However, significant difference was not found among thetreatments. It might be considered that the experimental results will be applied to soil carbon sequestration forfuture study.

휴경기간 녹비재배 농경지 토양에서 아산화질소 및 이산화탄소 배출특성

이선일,김건엽,최은정,이종식,정현철 한국농림기상학회 2018 한국농림기상학회지 Vol.20 No.4

Cropland is sources of atmospheric nitrous oxide (N2O) and carbon dioxide (CO2). However, the contribution of the fallow season to emission of these gases has rarely been determined. In this study, a field experiment encompassing three treatments was conducted to determine efflux of N2O and CO2 in cropland during fallow season. The treatments were hairy vetch (H.V.), rye and control (Con.). The H.V. and rye were sown in middle October and early November, respectively. The soil N2O efflux among all three treatments in the fallow season (November–April) were 0.014-2.956 mg N2O m-2⋅d-1. The cumulative N2O emissions were 104.4 mg N2O m-2 for Con., 85.8 mg N2O m-2 for H.V. and 85.0 mg N2O m-2 for Rye during the fallow season. The highest N2O emissions occurred in Con., while H.V. and Rye emissions were similar. Cumulative CO2 emissions were 293.1 g CO2 m-2 for Con., 242.2 g CO2 m-2 for H.V., 275.2 g CO2 m-2 for Rye during fallow season. This study showed that soil N2O and CO2 average daily emission during fallow season were 28.3% and 27.4%, respectively of the growing season. Our results indicate that CO2 and N2O emissions from agricultural systems continue throughout the fallow season. 농경지는 농업부문에서 배출되는 온실가스인 아산화질소와 이산화탄소의 공급원이다. 하지만 대부분 농경지 온실가스 배출연구는 경작기에 집중되어 있고, 휴경기 동안 거의 수행되지 않았다. 따라서 본 연구는 동절기 휴경 농경지 N2O와 CO2 배출량과 주요 환경요인과의 유의확률 및 경작기 배출량과 비교하였다. 휴경기동안 녹비작물로써 H.V.와 Rye를 재배하였을 때, N2O는 0.014∼2.956 mg N2O m-2⋅d-1 범위로 배출되었으며, 누적량은 대조구, H.V.처리구, Rye처리구에서 각각 104.4, 85.8 그리고 85.0 mg N2O m-2 배출되었다. 대조구에서 배출량이 가장 높았으며, H.V. 및 Rye 처리구는 비슷했다. 누적 이산화탄소 배출량은 대조구, H.V. 처리구, Rye 처리구에서 각각 293.1, 242.2 그리고 275.2 g CO2 m-2 배출되었다. 그리고 휴경기간동안 N2O 및 CO2 일 평균배출량은 경작기의 각각 28.3%, 27.4% 배출되었다.

다시 써보는 『예술 작품의 근원』

이선일 한국하이데거학회 2002 존재론 연구 Vol.7 No.-

AMR과 EVRC 음성부호화기를 위한 파라미터 직접 변환 방식의 상호부호화 알고리듬

이선일,유창동 대한전자공학회 2002 電子工學會論文誌-SP (Signal processing) Vol.39 No.11

본 논문에서는 AMR과 EVRC 음성부호화기를 위한 새로운 파라미터 직접 변환 방식의 상호부호화 알고리듬을 제안한다. 상호부호화를 위하여 부가적인 복호화, 부호화 과정을 거쳐야하는 기존의 Tandem 방식과 달리 제안된 파라미터 직접 변환 방식에서는 양 음성부호화기가 음성을 부호화하기 위하여 공통적으로 사용하는 파라미터들이 직접 변환된다. 제안된 알고리듬은 파라미터 복호화, 프레임 분류, 모드 결정, 그리고 두가지 프레임형을 위한 상호부호화기로 구성된다. 상호부호화기는 LSP, 프레임 에너지, 적응 코드북을 위한 피치 지연, 고정 코드북 벡터, 그리고 양 코드북의 이득을 변환한다. 제안된 알고리듬을 다양한 방법으로 평가해본 결과 기존의 Tandem 방식과 비교하여 계산량과 지연 시간을 줄이면서도 동등한 음질을 구현함을 확인할 수 있었다. In this paper, a novel transcoding algorithm for the Adaptive Multi Rate(AMR) and the Enhanced Variable Rate Codec(EVRC) vocoders via direct parameter transformation is proposed. In contrast to the conventional tandem transcoding algorithm, the proposed algorithm converts the parameters of one coder to the other without going through the decoding and encoding processes. The proposed algorithm consists of the parameter decoding, frame classification, mode decision, and transcoders for two frame types. The transcoders convert the parameters such as LSP, frame energy, pitch delay for the adaptive codebook, fixed codebook vector, and codebook gains. Evaluation results show that while exhibiting better computational and delay characteristics, the proposed algorithm produces equivalent speech quality to that produced by the tandem transcoding algorithm.

개방수조형 연구용 원자로에서 초기 운전 시나리오에 따른 노심입구온도 영향

이선일 한국에너지학회 2019 한국에너지공학회 학술발표회 Vol.2019 No.10

Analysis of Research Trends in Nitrous Oxide Emissions from Upland in Korea

이선일,이창규,김건엽,권효숙,이종식,최은정,신종두 한국토양비료학회 2019 한국토양비료학회지 Vol.52 No.4

Global climate change, especially global warming is considered as threat to our future and posterity. Increasing concentrations of greenhouse gas such as carbon dioxide (CO2), methane (CH4) and nitrous oxide (N2O) are the main causes of global warming. The Korean government has set a goal to cut the carbon emissions by 37% based on business-as-usual levels by 2030. According to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC), agricultural sector is an important source of greenhouse gas emissions. In this regard, it is common belief that reducing of such emission is of great significance to global climate change. In Korea, upland is one of the main sources of agricultural N2O emission. In order to analyze domestic research trends related to N2O emissions in the upland, 53 academic publications from 2009 to September 2019 were critically reviewed. The results were classified according to the research purposes. Reduction technologies of N2O emission account for approximately 28.3%. N2O characteristics and assessment for 24.5%, development of N2O emission factors for 22.6%, and N2O inventory assessment for 20.8% etc. Biochar, green manure, no tillage, and inhibitor were studied as a means of reducing N2O release. The optimum technologies to reduce N2O emission in Korea were discussed and proposed through the previous researches.

다시 써보는 『예술 작품의 근원』

이선일 한국하이데거학회 2002 현대유럽철학연구 Vol.7 No.-

가토 뇌기저핵에 단극성 전기응고 강도효과에 대한 실험적 연구

이선일,이영우 부산의대 1988 부산의대잡지 - 부산대학교 의과대학 Vol.28 No.2