• 한국방재학회:학술대회논문집
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• 한국방재학회 2010년도 정기 학술발표대회
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• pp.16-24
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• 2010

This paper introduces the applications of Taiwan Earthquake Loss Estimation System (TELES), which is developed by the National Center for Research on Earthquake Engineering (NCREE). Seismic disaster simulation technology (SDST) integrates geographical information system to assess the distribution of ground shaking intensity, ground failure probability, building damages, casualties, post-quake fires, debris, lifeline interruptions, economic losses, etc. given any set of seismic source parameters. The SDST may integrate with Taiwan Rapid Earthquake Information Release System (TREIRS) developed by Central Weather Bureau (CWB) to obtain valuable information soon after large earthquakes and to assist in decision-making processes to dispatch rescue and medical resources more efficiently. The SDST may also integrate with probabilistic seismic source model to evaluate various kinds of risk estimates, such as average annual loss, probable maximum loss in one event, and exceeding probability curves of various kinds of losses, to help proposing feasible countermeasures and risk management strategies.

• 한국토양비료학회지
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• 제16권2호
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• pp.112-118
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• 1983

전국 51개(個) 측후소(測候所) 및 분실(分室)의 강우성적(降雨成績)을 이용(利用)하여 토양유실량을 여측(予測)하기 위한 강우인자(降雨因子)(R-factor)를 분석(分析) 검토(檢討)한 결과(結果) 조사지역(調査地域)의 연평균(年平均) R-치(値)는 438이었으며 일반적(一般的)으로 동부지역(東部地域)은 R-치(値)가 200~300으로 낮았고 서부(西部) 및 남부지역(南部地域)과 제주도에서는 300~700으로 높았다. R-치(値)와 강우량(降雨量)과의 관계)는 지수함수의 유의성(有意性)있는 상관이 있었으며 이 관계식을 이용(利用)해 R-치(値)를 추정(推定)할 수 있었다. 포장(圃場)에서 측정(測定)한 토양유실량과 토양유실여측공식에 의(依)해 계산(計算)된 토양유실량을 비교(比較)해 본 결과(結果) 강우인자(降雨因子)는 EI 30을 사용(使用)하는 것이 타당(妥當)하였다.

• 한국농공학회:학술대회논문집
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• 한국농공학회 2000년도 학술발표회 발표논문집
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• pp.120-125
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• 2000

This study analyzes agricultural water demand nationwide which calculated by the estimation system for agricultural water demand(ESAD) with the data are observed in the other Studies. The results are as follows. Maximum, minimum and average values of annual evapotranspiration in paddy in 1,767 boundaries covering all the country are estimated as 819.2mm, 595.2mm and 702.9mm respectively. In the case of transplant seeding, the annual effective rainfall is estimated as 834.7mm to 464.3mm, while the average is 635.3mm. The amount of effective rainfall is largest in case of transplant seedlings and then come watered direct seeding and dry direct seeding regardless of region. Maximum, minimum and average values of annual evapotranspiration in upland in 1,767 boundaries are estimated as 659.97mm, 129.3mm and 411.8mm respectively. The annual effective rainfall is estimated as 607.2mm to 68.3mm while the average is 257.4mm. infiltration ratio in paddy in 1,767 boundaries applied in ESAD is 5.06mm/day in average, varying from 12.0mm/day to 2.0mm/day. Applied conveyance loss is 12.8% in average, varying from 18.0% to 8.0%.

• Advances in Energy Research
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• 제6권1호
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• pp.35-54
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• 2019

A successful blade design must satisfy some criterions which might be in conflict with maximizing annual energy yield for a specified wind speed distribution. These criterions include maximizing power output, more resistance to fatigue loads, reduction of tip deflection, avoid resonance and minimize weight and cost. These criterions can be satisfied by modifying the geometrical parameters of the blade. This study is dedicated to the aerodynamic assessment of a 20 kW horizontal axis wind turbine operating with two possible airfoils; that is $G{\ddot{o}}ttingen$ 413 and NACA 2415 airfoils (the Gottingen airfoil never been used in wind turbines). For this study parameters such as chord (constant, tapered and elliptic), twist angle (constant and linear) are varied and applied to the two airfoils independently in order to determine the most adequate blade configuration that produce the highest annual energy output. A home built numerical code based on the Blade Element Momentum (BEM) method with both Prandtl tip loss correction and Glauert correction, X-Foil and Weibull distribution is developed in Matlab and validated against available numerical and experimental data. The results of the assessment showed that the NACA 2415 airfoil section with elliptic chord and constant twist angle distributions produced the highest annual energy production.

• 대한원격탐사학회지
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• 제35권6_4호
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• pp.1351-1361
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• 2019

본 연구에서는 금강 유역(대청댐~금강하구둑)을 대상으로 RUSLE (Revised Universal Soil Loss Equation)를 활용하여 하천정비사업 전(2007년)과 후(2015년)의 연간 표토 침식량을 계산하였고, 이를 5단계의 class를 구분하여 해당 구간 별 표토침식면적을 산출하고 그 결과를 환경부의 토지피복 변화와 비교·분석하였다. RUSLE을 구성하는 각 인자를 생성하기 위하여 2007년과 2015년의 토지피복도, 국가기본 공간정보, 정밀 토양도, 연평균 강수량 자료 등의 다양한 공간정보자료를 활용하였다. 연구 결과, 연구지역에서의 연간 표토 침식량은 2007년과 대비하여 2015년에 class 1의 면적은 증가하였고, class 2, 3, 5의 면적은 감소하였으며, class 4의 면적은 증가하였다. 이러한 원인으로는 연구지역의 연평균 강수량의 감소, 생태공원조성과 이로 인한 인공시설물 확대, 농경지 감소 등으로 인하여 대부분의 지역에서 연평균 표토 침식량이 감소된 것으로 사료된다.

• 한국환경생태학회지
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• 제27권5호
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• pp.614-624
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• 2013

본 연구는 경주국립공원 전체 지구를 대상으로 토양침식에 대해 RUSLE 기법을 활용하여 잠재적 토양유실량과 침식위험도를 파악함으로써 토양생태계의 지속적인 보전과 더불어 재해방지 계획 수립을 위한 기초 자료 제공에 그 목적이 있다. 연평균 토양침식량 분석 결과, 전체 지구의 평균 토양침식량은 5.7ton/ha/yr로 나타났으며, 지구별로 남산 지구가 7.6ton/ha/yr로 가장 높았고 서악 지구가 2.1ton/ha/yr로 가장 낮았다. 토양침식위험등급 지역은 1% 미만으로 분석되었으며, 구미산 지구와 화랑 지구는 심각한 지역이 없었다. 그러나 남산 지구는 심각한 지역이 다른 지구에 비해 높게 나타났으며, 금오봉 일대에 집중되어 있었다. 따라서 금오봉 일대를 보호하기 위해서는 적절한 복원 및 관리방안이 수립되어야 할 것이다. 경주국립공원의 토지피복형태는 대부분 산림지역으로 나타났으며, 평균 토양침식량이 3.7ton/ha/yr로 양호한 수준인 것으로 확인되었다. 지형에 따른 토양침식량 분석 결과, 깊은 계곡이 단위면적 당 7.3ton/ha/yr로 나타났으며, 다음이 평탄곡지로 6.1ton/ha/yr로 분석되었다. 평탄지와 산정능선은 토양침식이 적게 발생되는 것으로 예측되었다. 향후, 국내 국립공원의 토양유실량을 분석한다면, 전체 국립공원의 토양생태계를 보전 및 복원할 수 있는 계획 수립에 도움이 될 것으로 기대된다.

• 한국농공학회논문집
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• 제62권2호
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• pp.53-62
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• 2020

The purpose of this study is to estimate the channel water loss of agricultural water supply in the command areas belong to Yechon irrigation channel of Gyeongcheon reservoir located Mungyeong-si, which area experienced a severe drought in 2015. The channel water loss was estimated by comparison of the irrigation water requirements (IWR) and agricultural water supply of the field data from 2012 to 2015. Further analysis was conducted to define the conveyance loss estimated based on the leakage holes and illegal pumping spots investigated through the field survey, and the distribution loss obtained by subtracting conveyance loss from the channel water loss. The annual rainfall decreased gradually, but the contribution of effective rainfall, available rain water to crop, increased to IWR during the study period. These phenomena resulted in the increase of agricultural water supply, and hence made greater the channel water loss simultaneously. The average channel water losses estimated as 36.8 % with 7.1 % of the conveyance loss and 29.7 % of distribution loss respectively. The distribution loss seems to be related to total number of rainy days, and irrigation schedules, while the conveyance loss was caused by irrigation channel aging conditions and illegal intake problems. In order to achieve sustainable agricultural water resources, the channel water loss needs to be reduced through the restoration of aged irrigation facilities and effective water managements in the fields.

• Earthquakes and Structures
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• 제13권4호
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• pp.421-427
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• 2017

Seismic safety evaluation of weir structure is significant considering the catastrophic economical consequence of operational disruption. In recent years, the seismic probabilistic risk assessment (SPRA) has been issued as a key area of research for the hydraulic system to mitigate and manage the risk. The aim of this paper is to assess the seismic probabilistic risk of weir structures employing the seismic hazard and the structural fragility in Korea. At the first stage, probabilistic seismic hazard analysis (PSHA) approach is performed to extract the hazard curve at the weir site using the seismic and geological data. Thereafter, the seismic fragility that defines the probability of structural collapse is evaluated by using the incremental dynamic analysis (IDA) method in accordance with the four different design limit states as failure identification criteria. Consequently, by combining the seismic hazard and fragility results, the seismic risk curves are developed that contain helpful information for risk management of hydraulic structures. The tensile stress of the mass concrete is found to be more vulnerable than other design criteria. The hazard deaggregation illustrates that moderate size and far source earthquakes are the most likely scenario for the site. In addition, the annual loss curves for two different hazard source models corresponding to design limit states are extracted.

• 국토계획
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• 제53권6호
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• pp.61-85
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• 2018

The purpose of this study is to provide a logical basis for guarantee the effectiveness of the tax support system, which is one of the main measures to prevent the side effects of commercial gentrification. For this purpose, this study analyzes the combination of tax support to replace the loss of net rental income due to stabilize commercial rents and annual rent increase rate that can be substituted through the tax support system based on economic utility of commercial lessors in Seoung-dong, Seoul. The result of this study shows that the tax support system can be used as an effective means to substitute a considerable portion of the net rental income loss due to stabilize commercial rents of Seongsu-dong. However if the rent price continues to rise every year, the tax support system does not work. In order to guarantee the sustainability of the tax support system, annual rent increase rate should be kept below a certain level.

• Ocean and Polar Research
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• 제44권2호
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• pp.127-137
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• 2022

This study examined the growth pattern and environmental factors affecting the growth of the halophyte, Suaeda japonica, which is prevalent on tidal flats in the west coast of Korea in order to calculate annual carbon production. Quantitative sampling was conducted every month for three years from 2018 to 2020 on salt marshes located on the southern coast of Ganghwa Island. In terms of annual density affected by the germination rate at first period, especially when air temperature for winter time was constantly below 0℃ for long periods of time, germination decreased and precipitation in summer also exerted an influence. In terms of annual growth with regard to length, the part below the ground grew rapidly in the beginning after budding, while the part above ground grew at a relatively steady rate at all times. With regard to biomass, the part below the ground also increased from April in a manner similar to length growth, but decreased drastically from September with leaves falling off and water loss occurring. The part above ground showed a rapid increase from the beginning of the rainy season. Size-frequency distribution revealed broader patterns after the rainy season as individual growth varied, but from September, it stopped at all year. High growth rates were recorded in the initial phase of growth after budding and growth was rapid, but growth declined in summer when biomass increased. The annual mean production based on growth rate was calculated at 352 gDWt/m²/yr, and the highest production was 519 gDWt/m²/yr in 2018, but it has decreased since 2019. Annual carbon production was at calculated 143.41 gC/m²/yr for Suaeda japonica in the vicinity of the southern coast of Ganghwa Island.