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이은주,정수아,정예진,형세진,이재원 전남대학교 농업과학기술연구소 2022 농업생명과학연구동향 Vol.60 No.-
The study analyzed the physical and chemical properties of dry-torrefied (DT) and wet-torrefied (WT) biomass. Hemicellulose was mainly degraded by torrefaction, and the contents of glucan and lignin were relatively increased. The degradation rate of biomass was higher in WT (18.25%–23.13%) than in DT biomass (3.12%–3.83%), and it increased with increasing reaction time. Torrefaction improved the crystallinity of the biomass from 36.88% in the raw material to a maximum value of 60.97% in the biomass subjected to wet torrefaction for 30 min (WT-30). The thermal stability of torrefied biomass was improved in WT-10 (17.21%), WT-60 (15.38%), and DT-60 (8.74%) compared to that of the raw material (2.35%). The hydrophobicity and fine particle distribution of biomass were increa- sed by torrefaction, with the lowest water absorption (3.08%) and the highest distribution of fine particles (8.20%) being observed in WT-60 biomass.
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기후위기 시대 생활권 녹지의 산림복지서비스 증진을 위한 주요 관목 50종의 탄소흡수량 비교
김학구,권경원,김세화,문형진,형세진,홍용식,피정훈,김찬범 한국산림휴양복지학회 2023 한국산림휴양학회지 Vol.27 No.4
One of the main functions of gardens and urban forests is to uptake carbon from cities. This study was conducted mainly on planted shrubs to enhance carbon storage and annual carbon uptake functions in gardens and urban forests. The materials were compared and analyzed for carbon storage and carbon uptake by plant 50 shrubs that are planted a lot in gardens and urban forests. As a result, the carbon storage was calculated in the order of C. coreana(215.76gC), C. chinensis(212.79gC), W. subsessilis(193.20gC), I. serrata(130.50gC), V. erosum(120.24gC), E. japonicus(108.28gC), S. toblata(106.99gC), P. tomentosa(100.14gC), N. domestica(93.50gC), R. scandens(88.92gC). The annual average carbon uptake was calculated in the order of C. coreana(263.71gCO2/y), C. chinensis(260.07gCO2/y), W. subsessilis(236.13gCO2/y), I. serrata(159.50gCO2/y), V. erosum(146.96gCO2/y), E. japonicus(132.34gCO2/y), S. oblata(130.77gCO2/y), P. tomentosa(122.40gCO2/y), N. domestica(114.28gCO2/y), R. scandens(108.68gCO2/y). As a result of comparing the annual carbon uptake amount of 5 groups in each of 10 shrub species to E from group A, the group A was showed statistical differences from the rest of the group (p<0.05). Shrubs in the group A had an average annual carbon uptake of about 8.16 times higher than those in the group E. Planting species with high carbon uptake when creating new carbon uptake sources such as gardens and urban forests is expected to increase the annual carbon uptake effect of neighborhood green space and enhance forest welfare services overall.
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정원 및 도시숲의 산림복지서비스 증진을 위한 관목 탄소흡수계수 개발
김학구,김형섭,권경원,문형진,김세화,형세진,진병철,김찬범 한국산림휴양복지학회 2024 한국산림휴양학회지 Vol.28 No.1
Gardens and urban forests provide various benefits, including recreation, healing, disaster prevention, particulate matter reduction, promotion of biodiversity, and temperature reduction. Recently, there has been growing interest in the carbon sequestration effect, wherein plants uptake and store carbon dioxide from the air through their growth. To quantify the carbon sequestration effect of gardens and urban forests and calculate the uptake amount, various carbon sequestration factors for each species, such as wood density, biomass expansion factor, root content ratio, and carbon content factor, are essential. Therefore, this study developed a carbon sequestration factor for each species in order to identify and quantify the carbon sequestration effect of 5 shrubs planted in gardens and urban forests. The materials are 250 plants produced in Chung-cheong area, and carbon sequestration factor was measured by classifying the plants that were directly harvested by parts(leaf+twig, branch, stem, root). As a result of the study, wood density was calculated in the order of C. dichotoma(0.67g/㎤), L. obtusifolium(0.63g/㎤), N. domestica(0.55g/㎤), C. alba(0.45g/㎤), and W. subsessilis(0.44g/㎤). Biomass expansion factor was calculated in the order of W. subsessilis(4.57), C. alba(4.25), C. dichotoma(3.76), N. domestica(3.07), and L. obtusifolium(2.29). The root content ratio was calculated in the order of N. domestica(0.64), C. dichotoma(0.40), W. subsessilis(0.30), C. alba(0.29), and L. obtusifolium(0.27). The carbon content factor was calculated in the order of W. subsessilis(45.91%), N. domestica(45.67%), C. dichotoma(45.32%), L. obtusifolium(45.04%) and C. alba(44.99%). In addition, appropriate variables were selected using a Machine Learning process in MATLAB, and relative allometric equations were developed to estimate carbon storage through SPSS Statistics regression analysis. The study results will contribute to accurately estimating the carbon sequestration effect of gardens and urban forests.
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제재부산물을 이용한 습식·건식 반탄화 바이오매스의 물리/화학적 특성분석
정수아 ( Su-a Jung ),정예진 ( Ye-jin Jung ),형세진 ( Se-jin Hyung ),다오카오지앙 ( Dao Kha Giang ),이재원 ( Jae-won Lee ) 한국목재공학회 2020 한국목재공학회 학술발표논문집 Vol.2020 No.1
제재부산물은 합판, 보드 업계에서 주로 발생되며 일부는 연료로 사용되고 있다. 하지만 제재부산물의 수요는 축소되고 있어 다양한 용도 개발이 필요하다. 제재부산물 활용 방안 중 하나는 생분해성 플라스틱 제조이다. 제재부산물을 생분해성 플라스틱 제조에 활용하기 위해서는 바이오매스 소수화, 다량의 미세분 생산이 요구된다. 이러한 요구사항은 수분, 휘발성 물질을 분해하는 반탄화공정을 이용하여 해결할 수 있으며 이는 분쇄과정에서 소요되는 에너지를 절약할 수 있다. 본 연구에서는 제재부산물을 향후 생분해성 플라스틱 제조에 적합한 원료로 사용하고자 원료를 수집하고 미세분화 공정을 비교하기 위해 습식 및 건식 반탄화를 수행하였다. 공시재료로 레드파인 제재부산물을 선정하였고 원료에 대한 물리, 화학적 특성을 분석한 후 유성밀을 이용하여 미세분화하여 반응조건에 대한 차이를 비교분석하였다. 습식 및 건식 반탄화는 200℃에서 10, 20, 30분 동안 수행하였으며, 각 바이오매스에 대해 화학성분 분석, 분쇄특성, 결정화도를 분석하였다.
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