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한국농공학회> 한국농공학회논문집> 포플러 목재칩을 이용한 농산촌 마을 집단난방시 연료품질, 비용, 대기환경에 미치는 영향에 관한 연구

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포플러 목재칩을 이용한 농산촌 마을 집단난방시 연료품질, 비용, 대기환경에 미치는 영향에 관한 연구

A Study on the Effect of Group Heating in Rural Villages Using Poplar Wood Chips on Fuel Quality, Cost, and Atmospheric Environment

안병일 ( An Byeong-il ) , 고경호 ( Ko Kyoung-ho )
  • : 한국농공학회
  • : 한국농공학회논문집 64권2호
  • : 연속간행물
  • : 2022년 03월
  • : 57-69(13pages)
한국농공학회논문집

DOI

10.5389/KSAE.2022.64.2.057


목차

Ⅰ. 서 론
Ⅱ. 본 론
Ⅲ. 결론 및 시사점
REFERENCES

키워드 보기


초록 보기

This study analyzes the fuel conditions and environmental effects of converting heating in rural villages that rely on fossil fuels into wood fuel. In particular, we tried to derive the most important considerations when using wooden chips as fuel in aging agricultural villages where various variables such as weather, facility characteristics, fuel quality, and maintenance capabilities work. Above all, an experiment was conducted by comparing it with oak trees to determine whether Italian poplar, a representative attribute water created to supply fuel wood in Korea, is suitable for heating fuel. Through experiments, 1) Even though the supply of poplar wood chips during 10 hours of operation was 60.74 kg less than that of hardwood chips, the production of hot water was 140 kWh higher. 2) The higher the exhaust gas temperature, the proportional (increase) oxygen concentration and inversely (decrease) PM and CO emissions. 3) Poplar has twice as much ash content as hardwood and three times more fine dust has been detected, but it meets all the standards for wood quality at the Korea Forest Science Institute. 4) Under the condition that there is a difference in water content (7.7%), hardwood cost 1.13 times more wood chips per 1 MWh than poplar, and even if the water content is corrected equally, hardwood cost 1.05 times more per 1 MWh than poplar. 5) In conclusion, it was proved that the fuel possibility, economic possibility, and environmental possibility of poplar wood chips are sufficient.

UCI(KEPA)

간행물정보

  • : 농학분야  > 농공학
  • : KCI등재
  • :
  • : 격월
  • : 1738-3692
  • : 2093-7709
  • : 학술지
  • : 연속간행물
  • : 2004-2022
  • : 1214


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KCI등재

1농업환경자원관리를 위한 팜맵 활용전략에 관한 연구

저자 : 위성승 ( Wee Seong-seung ) , 이원석 ( Lee Won-suk ) , 정남수 ( Jung Nam-su )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 3호 발행 연도 : 2022 페이지 : pp. 1-8 (8 pages)

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In this study, a farm map utilization strategy for sustainable agricultural environmental resource management was derived. In addition, it is intended to present an efficient method of providing farm map-related services. As a result of the demand survey, the additional information required for the farm map includes 29% of information on crops grown on farmland, 21% of management-related information such as the owner or business entity, 17% of topographical information including slope, 15% of agricultural water information, 17% of land status information, and the addition of functions. 2% was investigated. As a result of intensive interview survey, it was found that it can be used for information on crops cultivated by agricultural businesses, actual cultivated area by township, arable land consolidation division boundary, and management of agricultural promotion zones. The farm map can be used as basic data to efficiently manage agricultural environmental resources. Since the status of support for individual farms or lots, such as soil improvement agent support and organic fertilizer support, may belong to personal information, it can be processed and provided in units required by administration or policies, such as administrative boundaries, subwatersheds, and watersheds. It can serve as a basis for executing the direct payment currently supported only by individual farms, even in a community unit that manages environmental direct payments.

KCI등재

2농업용저수지의 실시간 수위 보정을 위한 Hampel Filter의 최적 Window Size 분석

저자 : 주동혁 ( Joo Dong-hyuk ) , 나라 ( Na Ra ) , 김하영 ( Kim Ha-young ) , 최규훈 ( Choi Gyu-hoon ) , 권재환 ( Kwon Jae-hwan ) , 유승환 ( Yoo Seung-hwan )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 3호 발행 연도 : 2022 페이지 : pp. 9-24 (16 pages)

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Currently, a vast amount of hydrologic data is accumulated in real-time through automatic water level measuring instruments in agricultural reservoirs. At the same time, false and missing data points are also increasing. The applicability and reliability of quality control of hydrological data must be secured for efficient agricultural water management through calculation of water supply and disaster management. Considering the characteristics of irregularities in hydrological data caused by irrigation water usage and rainfall pattern, the Korea Rural Community Corporation is currently applying the Hampel filter as a water level data quality management method. This method uses window size as a key parameter, and if window size is large, distortion of data may occur and if window size is small, many outliers are not removed which reduces the reliability of the corrected data. Thus, selection of the optimal window size for individual reservoir is required. To ensure reliability, we compared and analyzed the RMSE (Root Mean Square Error) and NSE (Nash-Sutcliffe model efficiency coefficient) of the corrected data and the daily water level of the RIMS (Rural Infrastructure Management System) data, and the automatic outlier detection standards used by the Ministry of Environment. To select the optimal window size, we used the classification performance evaluation index of the error matrix and the rainfall data of the irrigation period, showing the optimal values at 3 h. The efficient reservoir automatic calibration technique can reduce manpower and time required for manual calibration, and is expected to improve the reliability of water level data and the value of water resources.

KCI등재

3새만금간척지 지역 대기 중 초미세먼지 (PM2.5) 오염 특성 평가

저자 : 송지한 ( Song Ji-han ) , 김정수 ( Kim Jeong-soo ) , 홍성창 ( Hong Sung-chang ) , 김진호 ( Kim Jin-ho )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 3호 발행 연도 : 2022 페이지 : pp. 25-32 (8 pages)

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To understand the distribution characteristics of PM2.5 concentration in the Saemangeum Reclamation Area and nearby areas, three points of the background area, the occurrence area, and the affected area were selected and samples were collected for each season. The chemical composition was determined. As a result of analyzing the chemical composition contained in PM2.5, NO3 - (7.2 μg/m3), SO4 2- (4.3 μg/m3), NH4+ (4.3 μg/m3), OC (2.5 μg/m3), Si (1.3 μg/m3) m3) and EC (0.5 μg/m3) seemed to be the main components, and NO3-, SO4 2-, NH4 +, which are components that form secondary particles, occupied a large proportion. The composition ratio of PM2.5 was investigated in the order of ion component (56.8%) > Unknown (27.4%) > carbon component (11.8%) > heavy metal component (4.0%). During the PM2.5 high concentration case days, the ionic component accounted for 90.7% during atmospheric stagnation cases, whereas the chemical composition ratio was in the order of ionic component (51.7%) > heavy metal component (41.5%) > carbon component (6.8%) during yellow dust cases. It was found that the characteristic of PM2.5 in the Saemangeum reclaimed land and surrounding areas is mainly influenced by outside (domestic and overseas) throughout the year. Ion components accounted for the largest portion of PM2.5 components in this area, but there were few sources of SOx and NOx emission in the Seamangeum area, which are precursors for secondary particle formation. Therefore, it is judged that most of these are generated and influenced as a secondary reaction in the atmosphere from the outside.

KCI등재

4경사밭 고랑멀칭 방법에 따른 비점오염 저감효과 평가

저자 : 엽소진 ( Yeob So-jin ) , 김민경 ( Kim Min-kyeong ) , 김명현 ( Kim Myung-hyun ) , 방정환 ( Bang Jeong-hwan ) , 최순군 ( Choi Soon-kun )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 3호 발행 연도 : 2022 페이지 : pp. 33-43 (11 pages)

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South Korea's agricultural nitrogen balance and phosphorus balance rank first and second, respectively, among OECD countries, and proper nutrient management is required to preserve the water quality of rivers and lakes. This study evaluates the effects of furrow mulching on the reduction of non-point source pollution (NPS) load from a sloped upland. The study site was Wanju-gun, Jeollabuk-do, and the survey period was from 2018 to 2019. The slope of the testbed was 13%, and the soil type was sandy loam. The cropping system consisted of maize-autumn Chinese cabbage rotation. The testbed was composed of bare soil (bare), control (Cont.), furrow vegetation mulching (FVM), and furrow nonwoven fabric mulching (FFM) plots. Runoff was collected for each rainfall event with a 1/100 sampler, and the NPS load was calculated by measuring the concentrations of SS, T-N, and T-P. The NPS load was then analyzed for the entire monitoring and crop cultivation periods. During the monitoring period, the effect of reducing the NPS load was 1.5%∼44.5% for FVM and 13.1%∼55.2% for FFM. During the crop cultivation period, it was 1.2%∼80.5% for FVM and 27.0%∼65.1% for FFM, indicating that FFM was more effective than FVM. As the NPS load was fairly high during the crop conversion period, an appropriate management method needs to be implemented during this period.

KCI등재

5재하-제하과정에서 발생하는 흙의 변형계수 및 포아송비의 특성

저자 : 송창섭 ( Song Chang-seob ) , 김명환 ( Kim Myeong-hwan ) , 김기범 ( Kim Gi-beom ) , 박오현 ( Park Oh-hyun )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 3호 발행 연도 : 2022 페이지 : pp. 45-52 (8 pages)

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Prediction of soil behavior should be interpreted based on the level of axial strain in the actual ground. Recently numerical methods have been carried out focus on the state of soil failure. However considered the deformation of soil the prior to failure, mostly the small strain occurring in the elastic range is considered. As a result of calculating the deformation modulus to 50% of the maximum unconfined compression strength, Deformation modulus (E50) showed a tendency to increase according to the degree of compaction by region. The Poisson's ratio during loading-unloading was 0.63, which was higher than the literature value of 0.5. For the unconfined compression test under cyclic loading for the measurement of permanent strain, the maximum compression strength was divided into four step and the test was performed by load step. Changes in permanent strain and deformation modulus were checked by the loading-unloading test for each stage. At 90% compaction, the permanent deformation of the SM sample was 0.21 mm, 0.37 mm, 0.6 mm, and 1.35 mm. The SC samples were 0.1 mm, 0.17 mm, 0.42 mm, and 1.66 mm, and the ML samples were 0.48 mm, 0.95 mm, 1.30 mm, and 1.68 mm.

KCI등재

6유공암거 배수 구성: 환경지속가능성과 농업생산성 사이의 균형

저자 : 김경민 ( Kim Kyung-min ) , 정우성 ( Jeong Wu-seong ) , 바타라이라빈 ( Bhattarai Rabin ) , 정한석 ( Jeong Han-seok )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 3호 발행 연도 : 2022 페이지 : pp. 53-61 (9 pages)

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This study evaluated the impacts of subsurface drainage design, i.e., spacing and depth, on agricultural productivity and environmental sustainability in two tile-drained fields (Sites A and E) under a corn-soybean rotation in the Midwestern United States. A calibrated and validated Root Zone Water Quality Model (RZWQM) was used to simulate Nitrate-N (nitrogen) losses to tile drainage and crop yields of 30 tile spacing and depth scenarios over 24 years (1992-2015). Our results presented that the narrower and deeper the tile drains are placed, the greater corn yield and Nitrate-N losses, indicating that the subsurface drainage design may cause a trade-off between agricultural productivity and environmental sustainability. The simulation results also presented that up to about 255.7% and 628.0% increase in Nitrate-N losses in Sites A and E, respectively, far outweigh the rate of increase in corn yield up to about 1.1% and 1.6% from the adjustment of tile spacing and depth. Meanwhile, the crop yield and Nitrate-N losses according to the tile configuration differed depending on the field, and the soybean yield presented inconsistent simulation results, unlike the corn yield, which together demonstrate the heterogeneous characteristic of agro-environmental systems to a subsurface drainage practice. This study demonstrates the applicability of agricultural systems models in exploring agro-environmental responses to subsurface drainage practices, which can help guide the introduction and installation of tile systems into farmlands, e.g., orchards and paddy fields, in our country.

KCI등재

7관개용수로 CCTV 이미지를 이용한 CNN 딥러닝 이미지 모델 적용

저자 : 김귀훈 ( Kim Kwi-hoon ) , 김마가 ( Kim Ma-ga ) , 윤푸른 ( Yoon Pu-reun ) , 방재홍 ( Bang Je-hong ) , 명우호 ( Myoung Woo-ho ) , 최진용 ( Choi Jin-yong ) , 최규훈 ( Choi Gyu-hoon )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 3호 발행 연도 : 2022 페이지 : pp. 63-73 (11 pages)

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A more accurate understanding of the irrigation water supply is necessary for efficient agricultural water management. Although we measure water levels in an irrigation canal using ultrasonic water level gauges, some errors occur due to malfunctions or the surrounding environment. This study aims to apply CNN (Convolutional Neural Network) Deep-learning-based image classification and segmentation models to the irrigation canal's CCTV (Closed-Circuit Television) images. The CCTV images were acquired from the irrigation canal of the agricultural reservoir in Cheorwon-gun, Gangwon-do. We used the ResNet-50 model for the image classification model and the U-Net model for the image segmentation model. Using the Natural Breaks algorithm, we divided water level data into 2, 4, and 8 groups for image classification models. The classification models of 2, 4, and 8 groups showed the accuracy of 1.000, 0.987, and 0.634, respectively. The image segmentation model showed a Dice score of 0.998 and predicted water levels showed R2 of 0.97 and MAE (Mean Absolute Error) of 0.02 m. The image classification models can be applied to the automatic gate-controller at four divisions of water levels. Also, the image segmentation model results can be applied to the alternative measurement for ultrasonic water gauges. We expect that the results of this study can provide a more scientific and efficient approach for agricultural water management.

KCI등재

8강우량과 강우강도에 따른 지반함몰 상관관계 분석

저자 : 최창호 ( Choi Chang-ho ) , 김진영 ( Kim Jin-young ) , 강재모 ( Kang Jae-mo ) , 이성열 ( Lee Sung-yeol ) , 백원진 ( Baek Won-jin )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 3호 발행 연도 : 2022 페이지 : pp. 75-83 (9 pages)

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Recent settlements and sinkhole openings in urban areas have caused social problems such as damage to roads and structures, fear of the public, and loss of property. Several studies have demonstrated that surface subsidence and sinkhole opening are greatly affected by rainfall and rainfall intensity in urban areas. In this paper, we analyzed the relationship with the characteristics of recorded rainfall data using the ground subsidence database reported in major cities. The correlations were found using sedimentation and precipitation data from 2010 to 2014. The duration and intensity of a given precipitation have evolved to obtain an effect on ground sedimentation rate (SR). The results show that the relationship between SR and precipitation is asymptotic and can be modeled by a hyperbolic equation. Through this study, it is possible to predict the occurrence of ground subsidence due to precipitation in advance.

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1영농형 태양광 발전 시설 하부의 일사량 분포 모의

저자 : 정영준 ( Jeong Young-joon ) , 이상익 ( Lee Sang-ik ) , 이종혁 ( Lee Jong-hyuk ) , 서병훈 ( Seo Byung-hun ) , 김동수 ( Kim Dong-su ) , 이지민 ( Lee Jimin ) , 최원 ( Choi Won )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 2호 발행 연도 : 2022 페이지 : pp. 1-13 (13 pages)

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Agrivoltaic facility is the composite system that the solar panel is installed above the farmland, and it enables crop and electricity production simultaneously. Solar panels of the agrivoltaic facilities can block and reduce the amount of solar irradiance arriving at the farmland, but it can help the crop growth by preventing excessive solar irradiance. Therefore, to clarify how the agrivoltaic facilities affect the crop growth, precise solar irradiance distribution under the solar panel should be modeled. In this study, PAR (photosynthetically active radiation), radiation from 400 to 700 nm, which crops usually use to grow, was extracted from the total irradiance and its distribution model under various conditions was developed. Monthly irradiance distributions varied because the elevation of the sun was changed over time, which made the position changed that the local maximum and minimum irradiance appear. The higher panel height did not cause any significant difference in the amount of irradiance reaching below the solar panel, but its distribution became more uniform. Furthermore, the panel angles with the most irradiance arriving below the solar panel were different by month, but its difference was up to 2%p between the irradiance with 30° angle which is usually recommended in Korea. Finally, the interval between panels was adjusted; when the ratio of the length of the panel to the empty space was 1:2, the irradiance of 0.719 times was reached compared to when there was no panel, 0.579 times for 1:1 and 0.442 times for 2:1.

KCI등재

2인구, 주택, 농지 측면에서의 농촌지역 유휴화 취약성 평가

저자 : 이지민 ( Lee Jimin ) , 최원 ( Choi Won )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 2호 발행 연도 : 2022 페이지 : pp. 15-25 (11 pages)

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Idleness in rural areas is a very important issue with regard to national land space management. Previous studies have been conducted separately in terms of population housing and farmland. So, an integrated analysis considering population housing and farmland is required for rural spatial management. In this study, vulnerability indices were developed and spatial distribution of the vulnerable areas was analyzed by evaluating regional vulnerability on population, housing, and farmland. In addition, plans for rural space management plan were proposed considering the population hollowing out and the idle farmland. The results of this study would be helpful in preparing policies that take into account the vulnerability of idleness in rural areas.

KCI등재

3갈수기 지하수 물 사용량 저감 및 기저유출 수질 개선 방안 연구

저자 : 강태성 ( Kang Tae-seong ) , 양동석 ( Yang Dong-seok ) , 유나영 ( Yu Na-yeong ) , 신민환 ( Shin Min-hwan ) , 임경재 ( Lim Kyoung-jae ) , 김종건 ( Kim Jong-gun )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 2호 발행 연도 : 2022 페이지 : pp. 27-35 (9 pages)

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Based on the current status of groundwater usage in the dry season through field surveys, this study tried to suggest countermeasures to reduce groundwater usage and to improve the water quality of baseflow from agricultural fields. For this purposes, basins with water curtain cultivation preceded were targeted where decreases of groundwater due to continuous use of groundwater in spring and winter annually observed. From monitoring groudwater usage of the study watershed, 130,058, 130,105 ㎥/day of water was pumped in during the water curtain cultivation period (October-February) in the Shindun, Seokwon watershed respectively. And the pilot application of the smart automated sensor-based water curtain cultivation system (smart WC system) developed in this study to reduce groundwater consumption has been conducted. As a result, the efficiency of the smart WC system when threshold temperature is set as 6.3 ℃ was 21.1% compared to conventional cultivation and efficiency increased as threshold temperature gets lower. Lastly, in this study, culvert drainage and Bio-filters were installed and rainfall monitoring was performed 15 times in order to analyze the baseflow securement and pollutant loads behavior. As a result, the test-bed with culvert drainage and Bio-filter installed together generated 61.4% more baseflow (4.974 ㎥) than the test-bed with only culvert drainage was installed (3.056 ㎥). However, the total pollutant load of all water quality contents (BOD, COD, T-N, TOC) except for the SS and T-P was found to be greater in the culvert drain and Bio-filter installed than in the culvert drain test-bed.

KCI등재

4광해복원 경사지 밭의 토양유실 평가를 위한 현장실험 - 화학적 성질과 경사도 조건에서 -

저자 : 윤성욱 ( Yun Sung-wook ) , 강희천 ( Kang Hui-cheon ) , 권요셉 ( Kwon Yo-seb ) , 고일하 ( Koh Il-ha ) , 정문호 ( Jeong Mun-ho ) , 유찬 ( Yu Chan )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 2호 발행 연도 : 2022 페이지 : pp. 37-45 (9 pages)

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In-situ pilot experiment was carried out to establish a countermeasure on the soil loss from the hill side uplands that was rehabilitated by soil remediation method nearby abandoned mine sites for 2 years. It was considered that the affect of an inclination of cover surface, a stabilization treatment of cover layer by lime and steel refining slag (SRS) and a vegetation of soil surface as an effect factors in the experiment. It was constructed 4 lysimeters (plots, 22 m long, 4 m width) on the hilly side (37% inclination). One plot was control and two plots was treated by 1% lime and SRS. A remind one plot was modified a inclination to 27% to compare the affect of inclination on the amount of cover soil loss. It was attached a reservior tank and water level gauge in the end of lysimeters to measure the amount of the surface water flow and soil loss. It was also installed the automated sensors that could be collect the precipitation, soil moisture content, tension of cover layer in each plots. It was observed that the event of precipitation were caused the soil loss and it were related the physical and chemical properties of cover soil and inclination of surface layer of plots. During the experiment, it was exceeded the national regulation (50 t/ha/yr) in 37% inclination plots even though it was vegetated on the cover soil surface. However, in 27% inclination plot, it was shown that the amount of soil loss was maintained below the national regulation and, more ever, vegetation could reduce the the amount of soil loss. Therefore it was expected that such results could be applied to the future design of rehabilitation projects on the polluted farmland nearby abandoned mine sites.

KCI등재

5설계강우의 지속시간 및 시간분포에 따른 배수개선 농경지 침수 영향 분석

저자 : 전상민 ( Jun Sang-min ) , 김귀훈 ( Kim Kwi-hoon ) , 이현지 ( Lee Hyunji ) , 강기호 ( Kang Ki-ho ) , 유승환 ( Yoo Seung-hwan ) , 최진용 ( Choi Jin-yong ) , 강문성 ( Kang Moon-seong )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 2호 발행 연도 : 2022 페이지 : pp. 47-55 (9 pages)

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The objective of this study was to analyze the effect of the duration and time distribution of probability rainfall on farmland inundation for the paddy fields in the drainage improvement project site. In this study, eight drainage improvement project sites were selected for inundation modeling. Hourly rainfall data were collected, and 20- and 30-year frequency probability rainfalls were estimated for 14 different durations. Probability rainfalls were distributed using Intensity-Duration-Frequency (IDF) and Huff time distribution methods. Design floods were calculated for 48 hr and critical duration, and IDF time distribution and Huff time distribution were used for 48 hr duration and critical duration, respectively. Inundation modeling was carried out for each study district using 48 hr and critical duration rainfalls. The result showed that six of the eight districts had a larger flood discharge using the method of applying critical duration and Huff distribution. The results of inundation depth analysis showed similar trends to those of design flood calculations. However, the inundation durations showed different tendencies from the inundation depth. The IDF time distribution is a distribution in which most of the rainfall is concentrated at the beginning of rainfall, and the theoretical background is unclear. It is considered desirable to apply critical duration and Huff time distribution to agricultural production infrastructure design standards in consideration of uniformity with other design standards such as flood calculation standard guidelines.

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6포플러 목재칩을 이용한 농산촌 마을 집단난방시 연료품질, 비용, 대기환경에 미치는 영향에 관한 연구

저자 : 안병일 ( An Byeong-il ) , 고경호 ( Ko Kyoung-ho )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 2호 발행 연도 : 2022 페이지 : pp. 57-69 (13 pages)

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This study analyzes the fuel conditions and environmental effects of converting heating in rural villages that rely on fossil fuels into wood fuel. In particular, we tried to derive the most important considerations when using wooden chips as fuel in aging agricultural villages where various variables such as weather, facility characteristics, fuel quality, and maintenance capabilities work. Above all, an experiment was conducted by comparing it with oak trees to determine whether Italian poplar, a representative attribute water created to supply fuel wood in Korea, is suitable for heating fuel. Through experiments, 1) Even though the supply of poplar wood chips during 10 hours of operation was 60.74 kg less than that of hardwood chips, the production of hot water was 140 kWh higher. 2) The higher the exhaust gas temperature, the proportional (increase) oxygen concentration and inversely (decrease) PM and CO emissions. 3) Poplar has twice as much ash content as hardwood and three times more fine dust has been detected, but it meets all the standards for wood quality at the Korea Forest Science Institute. 4) Under the condition that there is a difference in water content (7.7%), hardwood cost 1.13 times more wood chips per 1 MWh than poplar, and even if the water content is corrected equally, hardwood cost 1.05 times more per 1 MWh than poplar. 5) In conclusion, it was proved that the fuel possibility, economic possibility, and environmental possibility of poplar wood chips are sufficient.

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7Budyko 프레임워크 기반 동적 물수지 모형을 활용한 월 단위 물순환 평가체계 개발

저자 : 김계웅 ( Kim Kyeung ) , 황순호 ( Hwang Soonho ) , 전상민 ( Jun Sang-min ) , 이현지 ( Lee Hyunji ) , 김시내 ( Kim Sinae ) , 강문성 ( Kang Moon Seong )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 2호 발행 연도 : 2022 페이지 : pp. 71-83 (13 pages)

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In this study, an indicator and assessment system for evaluating the monthly hydrological cycle was prepared using simple factors such as the landuse status of the watershed and topographic characteristics to the dynamic water balance model (DWBM) based on the Budyko framework. The parameters a1 of DWBM are introduced as hydrologic cycle indicators. An indicator estimation regression model was developed using watershed characteristics data for the introduced indicator, and an assessment system was prepared through K-means cluster analysis. The hydrological cycle assessment system developed in this study can assess the hydrological cycle with simple data such as land use, CN, and watershed slope, so it can quickly assess changes in hydrological cycle factors in the past and present. Because of this advantage is expected that the developed assessment system can predict changes in the hydrological cycle and use an auxiliary tool for policymaking.

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81930∼40년대 경지정리사업의 특징과 사회·경제적 배경

저자 : 김진수

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 64권 2호 발행 연도 : 2022 페이지 : pp. 85-96 (12 pages)

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The study is aimed to investigate the features and socio-economic background of farmland consolidation project with medium-sized paddy plot at irrigation associations during the Japanese colonial period in Korea. Most of farmland consolidation works in the 1940s was composed of independent irrigation and drainage ditches along the short side of field plot. However, the number of farm roads at farmland consolidation zone was much smaller than number of irrigation ditches to decrease reduction in farmland area. The standard field plot was medium-sized (about 20-40 ares) in Korea but small-sized (about 10 ares) in Japan in this period. As the result of farmland consolidation works, the unit water requirement was increased to 0.0035 ㎥/s/ha, and the unit area drainage discharge was over 2.0 ㎥/s/㎢ in many cases. The farmland consolidation with medium-sized plot have been spread under the colonial landlord system, where major landlords occupied a large share of farmland and managed corporate farming to gain more benefit. The reasons for spread of farmland consolidation with medium-sized plot may be as follows: high net profit ratio, an increase in land price, and labor savings in rice farming. The farmland consolidation with medium-sized plot in the colonial period showed intermediate features between the farm consolidation with small-sized plot for an increase in land productivity in Japan and the farm consolidation with medium-sized plot for an increase in labor productivity after the 1960s.

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