• Title, Summary, Keyword: Regional source

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Regional Electricity Planning Using Open Source-Based Optimization Model (오픈 소스 최적화모형을 이용한 지역단위 전력계획)

  • Chung, Yong Joo
    • The Journal of Information Systems
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    • v.28 no.1
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    • pp.133-153
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    • 2019
  • Purpose The purpose of this study is to design a regional electricity planning model rather than the existing single region ones and verify its usefulness. The regional electricity planning model is to determine both electricity distribution among regions and power plant planning at the same time satisfying regional demands and distribution networks. Design/methodology/approach This study made a regional electricity planning model by integrating power plant planning and electricity distribution among regions. The regional electricity planning model is formulated into a linear programming problem, and coded and run using the OSeMOSYS, one of open source energy systems. Findings According to the empirical analysis result, this study confirmed that the regional electricity planning model proposed in this study deducts the unfairness among regions in view of electricity and green house gas. In addition, the model is expected to be used in evaluating and developing the national policies concerning fine dust and/or green house gas.

Simulation of the Best Management Practice Impacts on Nonpoint Source Pollutant Reduction in Agricultural Area using STEPL WEB Model (STEPL WEB 모형을 이용한 농촌지역 비점오염원저감 대책 모의)

  • Park, Youn Shik;Kum, Dong Hyuk;Jung, Young Hun;Cho, Ja Pil;Lim, Kyoung Jae;Kim, Ki Sung
    • Journal of The Korean Society of Agricultural Engineers
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    • v.56 no.5
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    • pp.21-27
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    • 2014
  • Sediment-laden water is problematic in aquatic ecosystem and for hydraulic structures in a watershed, and agriculture area in a watershed is one of source areas of nonpoint source (NPS), since soil surface typically exposures due to agricultural activities. Especially, severe sediment might flow into stream when agricultural area is located near stream like the Imha-dam watershed. Soil erosion is affected by precipitation, therefore there is a need to consider precipitation characteristics in soil erosion and best management practices (BMPs) simulation. The Web-based Spreadsheet Tool for the Estimation of Pollutant Load (STEPL WEB) allows estimating long-term sediment loads and the impact of best management practices to reduce sediment loads. STEPL WEB and predicted precipitation data by MIROC-ESM model was used to estimate sediment loads and its reduction by filter strip and conversion of agricultural area to forest in the future 30 years. The result indicates that approximately 70 % of agricultural area requires filter strip installation or that approximately 50 % of agricultural area needs to be converted to forest, for 41 % of sediment load reduction.

A Study on the Introduction of the Regional Tendency into Korean Modern Interior Design (한국현대실내디자인에서 지역성의 구축에 관한 연구)

  • 남경숙
    • Korean Institute of Interior Design Journal
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    • no.27
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    • pp.96-103
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    • 2001
  • The purpose of this thesis is to study on the source, the introductive process and the phenomenon of the regional tendency into Korean modern interior design. To achieve the purpose of this study, the methods and contents are as follows : 1. Explaining the regionalism in the architecture as the source of the regional tendency. 2. Explaining the introductive process of the regional tendency in Korean modern interior design.. For that, 1)Explaining the traditional expression, the leo-corbusian expression and the organic expression with nature in Korean contemporary architecture 2)Explaining the vernacular expression and the abstract expression in Korean modern art 3. Studying the regional tendency in Korean modern interior design For that, 1)Studying the expression of Korean traditionality 2)Studying the expression of the vernacular 3)Studying the expression of the environmental affinity By theme methods and contents, we will study the introduction of the regional tendency into Korean modern interior design.

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The Study for Vibro-acoustic Noise Analysis in the Fuselage of Regional Turboprop Airplane (중형항공기 동체 소음해석 기법 연구)

  • Park, Illkyung;Kim, Sungjoon;Jung, Jinduck
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.20 no.3
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    • pp.44-50
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    • 2012
  • The noise reduction is important one of considerations in the process of a civil aircraft development program. External noise sources are classified into an air-born source and a structure-born source. Among these noise sources, the most affected noise source into a cabin is the air-born noise source from an engine or propeller. The external noise is transmitted into the cabin through the fuselage structure of airplane which are composed of an fuselage structure, an interior trim panel and an acoustic insulation layer between an fuselage structure and an interior trim panel. Therefore, appropriate fuselage structure and acoustic insulation layer is very important to reduce the internal noise level. In this paper, the vibro-acoustic coupled analysis of the cabin noise of the 80~90 seats regional turboprop aircraft is carried out to validate the acoustic analysis method using Direct BEM and FEM. The sound pressure level onto the fuselage skin is acquired by fan-source noise analysis using BEM, and which sound pressure is used as acoustic noise source in vibro-acoustic noise analysis for cabin noise analysis using FEM.

A Study on Bulk Deposition Flux of Dustfall and Insoluble Components in Pusan, Korea (부산지역 강하먼지와 불용성 성분의 침적량에 관한 연구)

  • 김유근;박종길;문덕환;황용식
    • Journal of Environmental Science International
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    • v.10 no.3
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    • pp.209-216
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    • 2001
  • Dustfall particles were collected by the modified American dust jar (wide inlet bottle type) at 6 sampling sites in Pusan area from March, 1999 to February, 2000. Thirteen chemical species (Al, Ca, Cd, Cr, Cu, Fe, K, Mg, Mn, Ni, Pb, Si, and Zn) were analyzed by AAS and ICP. The purposes of this study were to estimate qualitatively various bulk deposition flux of dustfall and insoluble components by applying regional and seasonal distribution. Dustfall amount of regional variations were found in order of coastal zone, industrial zone, commercial zone, agricultural zone and residential zone, and seasonal total dustfall had higher concentrations during spring for 6.741 ton/${km}^2$/season, lower concentrations during summer for 1.989 ton/${km}^2$/season, and annual total concentration was 17.742 ton/${km}^2$/year. The regional distributions of enrichment factor show well-defined anthropogenic metals (Cd, Cu, Pb, and Zn) at industrial and agricultural zone, and contribution rate of soil particles were found in order of summer, fall, winter and spring. Factor loading effects of chemical composition of dustfall were found in order of road traffic emission source and combustion processed source, industrial activity source, soil source and marine source.

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Characteristics of long-range transported PM2.5 at a coastal city using the single particle aerosol mass spectrometry

  • Cai, Qiuliang;Tong, Lei;Zhang, Jingjing;Zheng, Jie;He, Mengmeng;Lin, Jiamei;Chen, Xiaoqiu;Xiao, Hang
    • Environmental Engineering Research
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    • v.24 no.4
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    • pp.690-698
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    • 2019
  • Air pollution has attracted ever-increasing attention because of its substantial influence on air quality and human health. To better understand the characteristics of long-range transported pollution, the single particle chemical composition and size were investigated by the single particle aerosol mass spectrometry in Fuzhou, China from 17th to 22nd January, 2016. The results showed that the haze was mainly caused by the transport of cold air mass under higher wind speed (10 m·s-1) from the Yangtze River Delta region to Fuzhou. The number concentration elevated from 1,000 to 4,500 #·h-1, and the composition of mobile source and secondary aerosol increased from 24.3% to 30.9% and from 16.0% to 22.5%, respectively. Then, the haze was eliminated by the clean air mass from the sea as indicated by a sharp decrease of particle number concentration from 4,500 to 1,000 #·h-1. The composition of secondary aerosol and mobile sources decreased from 29.3% to 23.5% and from 30.9% to 23.1%, respectively. The particles with the size ranging from 0.5 to 1.5 ㎛ were mainly in the accumulation mode. The stationary source, mobile source, and secondary aerosol contributed to over 70% of the potential sources. These results will help to understand the physical and chemical characteristics of long- range transported pollutants.

Three Reanalysis Data Comparison and Monsoon Regional Analysis of Apparent Heat Source and Moisture Sink (겉보기 열원 및 습기 흡원의 세 재분석 자료 비교와 몬순 지역별 분석)

  • Ha, Kyung-Ja;Kim, Seogyeong;Oh, Hyoeun;Moon, Suyeon
    • Atmosphere
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    • v.28 no.4
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    • pp.415-425
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    • 2018
  • The roles of atmospheric heating formation and distribution on the global circulation are of utmost importance, and those are directly related to not only spatial but also temporal characteristics of monsoon system. In this study, before we clarify the characteristics of apparent heat source <$Q_1$> and moisture sink <$Q_2$>, comparisons of three reanalysis datasets (NCEP2, ERA-Interim, and JRA-55) in its global or regional patterns are performed to clearly evaluate differences among datasets. Considering inter-hemispheric difference of global monsoon regions, seasonal means of June-July-August and December-January-February, which is summer (winter) and winter (summer) in the Northern (Southern) Hemisphere are employed respectively. Here we show the characteristics of eight different regional monsoon regions and find contributions of <$Q_2$> to <$Q_1$> for the regional monsoon regions. Each term in apparent heat source and moisture sink is shown to come from the ERA-Interim dataset, since the ERA-Interim could be representative of three datasets. The NCEP2 data has a different characteristic in the ratio of <$Q_2$> and <$Q_1$> because it overestimates <$Q_1$> compared to the other two different datasets. The Australia monsoon has been performing better over time, while some regional monsoons (South America, North America, and North Africa) have been showing increasing data inconsistency. In addition, the three reanalysis datasets are getting different marching with time, in particular since the early 2000s over South America, North America, and North Africa monsoon regions. The recent inconsistency among the three datasets that may be associated with the global warming hiatus remains unexplored.

Limitation Analysis on Estimation of SS Pollutant Load using Korean Ministry of Environment's 8-Day Interval Flow and Water Quality data (환경부 8일 유량‧수질 자료를 이용한 SS오염부하량 산정의 한계점 분석)

  • Kim, Taegoo;Yoo, Jongwon;Cho, Hyung-ik;Han, Jeongho;Lee, Dong Jun;Jung, Younghun;Yang, Jae E;Lim, Kyoung Jae
    • Journal of Korean Society on Water Environment
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    • v.32 no.2
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    • pp.149-162
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    • 2016
  • In recent years, there has been demand for precise estimations of pollutant loads on nationwide scale for the development of appropriate site specific (watershed specific) policies to reduce the negative impact of pollutant loads. River flow data and water quality data that were previously collected by various research institutes and universities for specific research purposes for a limited period was utilized in this study. However, only TMDL 8-day interval flow and water quality data were available in national scale. Three watersheds were selected and pollutant loads were calculated by two methods i.e., Numeric Integration (NI) method and Soil and Water Assessment Tool (SWAT). Subsequently, the results were compared to determine the appropriate method for monitoring nonpoint source networks nationwide. The SWAT model was calibrated and its estimated daily flow data were used in the NI method with estimated sediment data for 8-day monitoring data for three watersheds. The results indicated that the quantity of pollutant loads estimated with the NI and SWAT are different to some degrees especially during the summer season for all the three study watersheds. Thus, more frequent sampling of water quality is needed for nonpoint source pollutant estimation.

Evaluation of Modeling Approach for Suspended Sediment Yield Reduction by Surface Cover Material using Rice Straw at Upland Field (모델링 기법을 이용한 밭의 볏짚 지표피복의 부유사량 저감효과 평가 방법)

  • Park, Youn Shik;Kum, Donghyuk;Lee, Dong Jun;Choi, Joongdae;Lim, Kyoung Jae;Kim, Ki-sung
    • Journal of Korean Society on Water Environment
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    • v.32 no.1
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    • pp.108-114
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    • 2016
  • Sediment-laden water leads to water quality degradation in streams; therefore, best management practices must be implemented in the source area to control nonpoint source pollution. Field monitoring was implemented to measure precipitation, direct runoff, and sediment concentrations at a control plot and straw-applied plot to examine the effect on sediment reduction in this study. A hydrology model, which employs Curve Number (CN) to estimate direct runoff and the Universal Soil Loss Equation to estimate soil loss, was selected. Twenty-five storm events from October 2010 to July 2012 were observed at the control plot, and 14 storm events from April 2011 to July 2011 at the straw-applied plot. CN was calibrated for direct runoff, and the Nash-Sutcliffe efficiency and coefficient of determination were 0.66 and 0.68 at the control plot. Direct runoff at the straw-applied plot was calibrated using the percentage direct runoff reduction. The estimated reduction in sediment load by direct runoff reduction calibration alone was acceptable. Therefore, direct runoff-sediment load behaviors in a hydrology model should be considered to estimate sediment load and the reduction thereof.