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한국농공학회> 한국농공학회논문집> 양돈사 내 동물 활동도에 따른 암모니아 및 미세먼지 배출농도 특성 분석

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양돈사 내 동물 활동도에 따른 암모니아 및 미세먼지 배출농도 특성 분석

An Investigation of Emission of Particulate Matters and Ammonia in Comparison with Animal Activity in Swine Barns

박진선 ( Park Jinseon ) , 정한나 ( Jeong Hanna ) , 이세연 ( Lee Se Yeon ) , 최락영 ( Choi Lak Yeong ) , 홍세운 ( Hong Se-woon )
  • : 한국농공학회
  • : 한국농공학회논문집 63권6호
  • : 연속간행물
  • : 2021년 11월
  • : 117-129(13pages)
한국농공학회논문집

DOI

10.5389/KSAE.2021.63.6.117


목차

Ⅰ. 서 론
Ⅱ. 재료 및 방법
Ⅲ. 결과 및 고찰
Ⅳ. 결 론
감사의 글
REFERENCES

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초록 보기

The movement of animals is one of the primary factors that influence the variation of livestock emissions. This study evaluated the relationship between animal activity and three major emissions, PM10, PM2.5, and ammonia gas, in weaning, growing, and fattening pig houses through continuous monitoring of the animal activity. The movement score of animals was quantified by the developed image analysis algorithm using 10-second video clips taken in the pig houses. The calculated movement scores were validated by comparison with six activity levels graded by an expert group. A comparison between PMs measurement and the movement scores demonstrated that an increase of the PMs concentrations was obviously followed by increased movement scores, for example, when feeding started. The PM10 concentrations were more affected by the animal activity compared to the PM2.5 concentrations, which were related to the inflow of external PM2.5 due to ventilation. The PM10 concentrations in the fattening house were 1.3 times higher than those in the weaning house because of the size of pigs while weaning pigs were more active and moved frequently compared to fattening pigs showing 2.45 times higher movement scores. The results also indicated that indoor ammonia concentration was not significantly influenced by animal activity. This study is significant in the sense that it could provide realistic emission factors of pig farms considering animal’s daily activity levels if further monitoring is carried out continuously.

UCI(KEPA)

I410-ECN-0102-2022-500-000833239

간행물정보

  • : 농학분야  > 농공학
  • : KCI등재
  • :
  • : 격월
  • : 1738-3692
  • : 2093-7709
  • : 학술지
  • : 연속간행물
  • : 2004-2022
  • : 1206


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64권2호(2022년 03월) 수록논문
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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.

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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.

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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.

KCI등재

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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1APEX-paddy 모델을 활용한 SSPs 시나리오에 따른 논 필요수량 변동 평가

저자 : 최순군 ( Choi Soon-kun ) , 조재필 ( Cho Jaepil ) , 정재학 ( Jeong Jaehak ) , 김민경 ( Kim Min-kyeong ) , 엽소진 ( Yeob So-jin ) , 조세라 ( Jo Sera ) , 오수당콰에릭 ( Owusu Danquah Eric ) , 방정환 ( Bang Jeong Hwan )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 1-16 (16 pages)

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Global warming due to climate change is expected to significantly affect the hydrological cycle of agriculture. Therefore, in order to predict the magnitude of climate impact on agricultural water resources in the future, it is necessary to estimate the water demand for irrigation as the climate change. This study aimed at evaluating the future changes in water demand for irrigation under two Shared Socioeconomic Pathways (SSPs) (SSP2-4.5 and SSP5-8.5) scenarios for paddy rice in Gimje, South Korea. The APEX-Paddy model developed for the simulation of paddy environment was used. The model was calibrated and validated using the H2O flux observation data by the eddy covariance system installed at the field. Sixteen General Circulation Models (GCMs) collected from the Climate Model Intercomparison Project phase 6 (CMIP6) and downscaled using Simple Quantile Mapping (SQM) were used. The future climate data obtained were subjected to APEX-Paddy model simulation to evaluate the future water demand for irrigation at the paddy field. Changes in water demand for irrigation were evaluated for Near-future-NF (2011-2040), Mid-future-MF (2041-2070), and Far-future-FF (2071-2100) by comparing with historical data (1981-2010). The result revealed that, water demand for irrigation would increase by 2.3%, 4.8%, and 7.5% for NF, MF and FF respectively under SSP2-4.5 as compared to the historical demand. Under SSP5-8.5, the water demand for irrigation will worsen by 1.6%, 5.7%, 9.7%, for NF, MF and FF respectively. The increasing water demand for irrigating paddy field into the future is due to increasing evapotranspiration resulting from rising daily mean temperatures and solar radiation under the changing climate.

KCI등재

2비닐하우스 기초 토양의 다짐률 변화에 따른 전단강도 특성

저자 : 임성윤 ( Lim Seongyoon ) , 허기석 ( Heo Giseok ) , 곽동엽 ( Kwak Dongyoup )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 17-26 (10 pages)

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Greenhouses have been damaged due to the uplift pressure from strong wind, for which rebar piles are often installed near the greenhouse to resist the pressure. For the effective design of rebar piles, it is necessary to access the shear strength of soil on which the greenhouse is constructed. This study experimentally evaluates the shear strength of the soil beneath the greenhouse. Four soil samples were collected from four agricultural sites, and prepared for testing with 75, 80, 85, and 90% compaction rates. One-dimensional unconfined compression test (UC), consolidated-undrained triaxial test (CU), and resonant column test (RC) were performed for the evaluation of shear strength and shear modulus. Generally, the higher shear strength and modulus were observed with the higher compaction rates. In particular, the UC shear strength increases with the increase of #200 sieve passing rate. Resulting from the CU test, the sample with the most of coarse soil had the highest friction angle, but the variation is small among samples. Resulting from the CU and RC tests, the ratio of maximum shear modulus with the major principle stress at failure was the higher at the finer soil. The ratio was two to three times greater than the ratio from the standard sand. This indicates that the shear strength is lower for the fine soil than the coarse soil at the same shear modulus. The results of this study will be a useful resource for the estimation of the pull-out strength of the rebar pile against the uplift pressure.

KCI등재

3토지피복지도를 이용한 저수지 수혜구역 농경지 면적 및 변화 추이 분석

저자 : 권채린 ( Kwon Chaelyn ) , 박진석 ( Park Jinseok ) , 장성주 ( Jang Seongju ) , 신형진 ( Shin Hyungjin ) , 송인홍 ( Song Inhong )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 27-37 (11 pages)

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Conversion of rice paddy field to upland has been accelerated as the central government incentivizes more profitable upland crop cultivation. The objective of this study was to investigate the current status and conversion trend from paddy to upland for the reservoir irrigation districts. Total 605 of reservoir irrigation districts whose beneficiary area is greater than 200 ha were selected for paddy-to-upland conversion analysis using the land cover maps provided by the EGIS of the Ministry of Environment. The land cover data of 2019 was used to analyze up-to-date upland conversion status and its correlation with city proximity, while land cover change between 2007 and 2019 was used for paddy-to-upland conversion trend analysis. Overall 14.8% of the entire study reservoir irrigation area was converted to upland cultivation including greenhouse and orchard areas. Approximately the portion of paddy area was reduced by 17.8% on average, while upland area was increased by 4.9% over the 12 years from 2007 to 2019. This conversion from paddy to upland cultivation was more pronounced in the Gyoenggi and Gyeongsang regions compared to other the Jeolla and Chungcheong provinces. The increase of upland area was also more notable in proximity of the major city. This study findings may assist to identify some hot reservoir districts of the rapid conversion to upland cultivation and thus plan to transition toward upland irrigation system.

KCI등재

4이미지 분석을 통한 서양측백나무의 광학적 공극도 산정 및 공기역학계수와의 상관성 평가

저자 : 장동화 ( Jang Dong-hwa ) , 양가영 ( Yang Ka-young ) , 김종복 ( Kim Jong-bok ) , 권경석 ( Kwon Kyeong-seok ) , 하태환 ( Ha Taehwan )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 39-47 (9 pages)

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Reduction effect of the spread of odorant and fine dust through windbreak trees can be predicted through numerical analysis. However, there is a disadvantage that a large space and destructive experiments must be carried out each time to calculate the aerodynamic coefficient of the tree. In order to overcome these shortcomings, In this study, we aimed to estimate the aerodynamic coefficient (C0, C1, C2) by using image processing. Thuja occidentalis, which can be used as windbreak were used as the material. The leaf area index was estimated from the leaf area ratio using image processing with leaf weight, and the optical porosity was calculated through image processing of photos taken from the side while removing the leaves step-by-step. Correlation analysis was conducted with the aerodynamic coefficient of Thuja occidentalis calculated from the wind tunnel test and leaf area index and optical porosity calculated from the image analysis. The aerodynamic coefficient showed positive and negative correlations with the leaf area index and optical porosity, respectively. The results showed that the possibility of estimating the aerodynamic coefficient using image processing.

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5남한지역 일단위 강우량 공간상세화를 위한 BCSA 기법 적용성 검토

저자 : 황세운 ( Hwang Syewoon ) , 정임국 ( Jung Imgook ) , 김시호 ( Kim Siho ) , 조재필 ( Cho Jaepil )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 49-60 (12 pages)

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BCSA (Bias-Correction and Stochastic Analog) is a statistical downscaling technique designed to effectively correct the systematic errors of GCM (General Circulation Model) output and reproduce basic statistics and spatial variability of the observed precipitation filed. In this study, the applicability of BCSA was evaluated using the ASOS observation data over South Korea, which belongs to the monsoon climatic zone with large spatial variability of rainfall and different rainfall characteristics. The results presented the reproducibility of temporal and spatial variability of daily precipitation in various manners. As a result of comparing the spatial correlation with the observation data, it was found that the reproducibility of various climate indices including the average spatial correlation (variability) of rainfall events in South Korea was superior to the raw GCM output. In addition, the needs of future related studies to improve BCSA, such as supplementing algorithms to reduce calculation time, enhancing reproducibility of temporal rainfall patterns, and evaluating applicability to other meteorological factors, were pointed out. The results of this study can be used as the logical background for applying BCSA for reproducing spatial details of the rainfall characteristic over the Korean Peninsula.

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6간월호 유역의 토지이용 및 기후변화에 따른 논밭 필요수량 변화 추정

저자 : 김시내 ( Kim Sinae ) , 김석현 ( Kim Seokhyeon ) , 황순호 ( Hwang Soonho ) , 전상민 ( Jun Sang-min ) , 송정헌 ( Song Jung-hun ) , 강문성 ( Kang Moon-seong )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 61-75 (15 pages)

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This study aims to assess the changes in crop water requirement of paddy and upland according to future climate and land use changes scenarios. Changes in the spatiotemporal distribution of temperature and precipitation are factors that lower the stability of agricultural water supply, and predicting the changes in crop water requirement in consideration of climate change can prevent the waste of limited water resources. Meanwhile, due to the recent changes in the agricultural product consumption structure, the area of paddy and upland has been changing, and it is necessary to consider future land use changes in establishing an appropriate water use plan. Climate change scenarios were derived from the four GCMs of the CMIP6, and climate data were extracted under two future scenarios, namely SSP1-2.6 and SSP5-8.5. Future land use changes were predicted using the FLUS (Future Land Use Simulation) model. Crop water requirement in paddy was calculated as the sum of evapotranspiration and infiltration based on the water balance in a paddy field, and crop water requirement in upland was estimated as the evapotranspiration value by applying Penman-Monteith method. It was found that the crop water requirement for both paddy and upland increased as w e go to the far future, and the degree of increase and variability by time showed different results for each GCM. The results derived from this study can be used as basic data to develop sustainable water resource management techniques considering future watershed environmental changes.

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7기계학습을 활용한 오리사 바닥재 수분 발생량 분석

저자 : 김다인 ( Kim Dain ) , 이인복 ( Lee In-bok ) , 여욱현 ( Yeo Uk-hyeon ) , 이상연 ( Lee Sang-yeon ) , 박세준 ( Park Sejun ) , 크리스티나 ( Cristina Decano ) , 김준규 ( Kim Jun-gyu ) , 최영배 ( Choi Young-bae ) , 조정화 ( Cho Jeong-hwa ) , 정효혁 ( Jeong Hyo-hyeog ) , 강솔뫼 ( Kang Solmoe )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 77-88 (12 pages)

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Duck industry had a rapid growth in recent years. Nevertheless, researches to improve duck house environment are still not sufficient enough. Moisture generation of duck house litter is an important factor because it may cause severe illness and low productivity. However, the measuring process is difficult because it could be disturbed with animal excrements and other factors. Therefore, it has to be calculated according to the environmental data around the duck house litter. To cut through all these procedures, we built several machine learning regression model forecasting moisture generation of litter by measured environment data (air temperature, relative humidity, wind velocity and water contents). 5 models (Multi Linear Regression, k-Nearest Neighbors, Support Vector Regression, Random Forest and Deep Neural Network). have been selected for regression. By using R-Square, RMSE and MAE as evaluation metrics, the best accurate model was estimated according to the variables for each machine learning model. In addition, to address the small amount of data acquired through lab experiments, bootstrapping method, a technique utilized in statistics, was used. As a result, the most accurate model selected was Random Forest, with parameters of n-estimator 200 by bootstrapping the original data nine times.

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8하천 수질에 대한 어류의 서식처적합도지수 산정 - 피라미를 대상으로 -

저자 : 홍록기 ( Hong Rokgi ) , 박진석 ( Park Jinseok ) , 장성주 ( Jang Seongju ) , 송인홍 ( Song Inhong )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 89-100 (12 pages)

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The conservation of stream habitats has been gaining more public attention and fish habitat suitability index (HSI) is an important measure for ecological stream habitat assessment. The fish habitat preference is affected not only by physical stream conditions but also by water quality of which HSI was not available due to the lack of field data. The purpose of this study is to estimate the HSI of Zacco platypus for water quality parameters of water temperature, dissolved oxygen (DO), and biochemical oxygen demand (BOD) using the water environment monitoring data provided by the Ministry of Environment (ME). Fish population data merged with water quality were constructed by spatio-temporal matching of nationwide water quality monitoring data with bio-monitoring data of the ME. Two types of the HSI were calculated by the Instream Flow and Aquatic Systems Group (IFASG) method and probability distribution (Weibull) fitting for the four major river basins. Both the HSIs by the IFASG and Weibull fitting appeared to represent the overall distribution and magnitude of fish population and this can be used in stream fish habitat evaluation considering water quality.

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9Terra MODIS 및 Sentinel-2 NDVI의 식생 및 농업 모니터링 비교 연구

저자 : 손무빈 ( Son Moo-been ) , 정지훈 ( Chung Jee-hun ) , 이용관 ( Lee Yong-gwan ) , 김성준 ( Kim Seong-joon )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 101-115 (15 pages)

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The purpose of this study is to evaluate the compatibility of the vegetation index between the two satellites and the applicability of agricultural monitoring by comparing and v erifying NDVI (Normalized Difference Vegetation Index) based on S entinel-2 and T erra MODIS (Moderate Resolution Imaging Spectroradiometer). Terra MODIS NDVI utilized 16-day MOD13Q1 data with 250 m spatial resolution, and Sentinel-2 NDVI utilized 10-day Level-2A BOA (Bottom Of Atmosphere) data with 10 m spatial resolution. To compare both NDVI, Sentinel-2 NDVIs were reproduced at 16-day intervals using the MVC (Maximum Value Composite) technique. As a result of time series NDVIs based on two satellites for 2019 and compare by land cover, the average R2 (Coefficient of determination) and RMSE (Root Mean Square Error) of the entire land cover were 0.86 and 0.11, which indicates that Sentinel-2 NDVI and MODIS NDVI had a high correlation. MODIS NDVI is overestimated than Sentinel-2 NDVI for all land cover due to coarse spatial resolution. The high-resolution Sentinel-2 NDVI was found to reflect the characteristics of each land cover better than the MODIS NDVI because it has a higher discrimination ability for subdivided land cover and land cover with a small area range.

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10양돈사 내 동물 활동도에 따른 암모니아 및 미세먼지 배출농도 특성 분석

저자 : 박진선 ( Park Jinseon ) , 정한나 ( Jeong Hanna ) , 이세연 ( Lee Se Yeon ) , 최락영 ( Choi Lak Yeong ) , 홍세운 ( Hong Se-woon )

발행기관 : 한국농공학회 간행물 : 한국농공학회논문집 63권 6호 발행 연도 : 2021 페이지 : pp. 117-129 (13 pages)

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The movement of animals is one of the primary factors that influence the variation of livestock emissions. This study evaluated the relationship between animal activity and three major emissions, PM10, PM2.5, and ammonia gas, in weaning, growing, and fattening pig houses through continuous monitoring of the animal activity. The movement score of animals was quantified by the developed image analysis algorithm using 10-second video clips taken in the pig houses. The calculated movement scores were validated by comparison with six activity levels graded by an expert group. A comparison between PMs measurement and the movement scores demonstrated that an increase of the PMs concentrations was obviously followed by increased movement scores, for example, when feeding started. The PM10 concentrations were more affected by the animal activity compared to the PM2.5 concentrations, which were related to the inflow of external PM2.5 due to ventilation. The PM10 concentrations in the fattening house were 1.3 times higher than those in the weaning house because of the size of pigs while weaning pigs were more active and moved frequently compared to fattening pigs showing 2.45 times higher movement scores. The results also indicated that indoor ammonia concentration was not significantly influenced by animal activity. This study is significant in the sense that it could provide realistic emission factors of pig farms considering animal's daily activity levels if further monitoring is carried out continuously.

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