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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.
Modeling, validation and energy flow analysis of a wheel loader
김학구,오광석,고경은,김판영,이경수 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.2
This paper presents a wheel loader simulation model, validation results and energy flow analysis. The developed simulation model will facilitate the performance evaluation and optimization process in the development stage of a prototype wheel loader. The wheel loader simulation model consists of mechanical and hydraulic powertrain model, multi-body dynamic model and working part dynamic model. The multi-body dynamic model is simplified since the effect of pitch and roll motion of the wheel loader on the energy flow of the powertrain and hydraulic actuator systems is insignificant, a simplified planar model for the dynamic vehicle is good enough for the objective of this study. Every component is modeled and integrated in a simulation package developed using Matlab/Simulink. The simulation model has been validated using experiment data and the validation results show that it effectively represents the actual dynamic characteristic of the target wheel loader. The verified simulation model will be used as a virtual platform to evaluate the performance of alternative powertrain models such as a dual-clutch transmission and hydrostatic transmission. An advanced control system can also be implemented and evaluated using the virtual platform.
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.