• 한국습지학회지
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• 제24권3호
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• pp.161-169
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• 2022

본 연구에서는 수원지방에서 효율적이고 타당한 빗물저류조의 용량을 평가하기 위하여 수원강우관측소의 월평균강수량, 일강수량변동곡선 및 일강우일수를 분석하였다. 빗물저류조 용량별 연평균빗물사용량 및 일평균저수량은 빗물저류조내 유입되는 일강수량, 일수요량, 빗물저류조의 용량 등을 일단위 연속방정식에 적용하여 산정하였다. 빗물저류조 용량별 연평균빗물사용량, 이용효율, 저류조 사용일수, 저류조의 일평균저수량, 일별수요량 등을 감안하여 빗물저류조의 용량을 평가하면 물의 재이용 관련 법령에서 제시한 활용강우량 50.0mm 이상은 과다한 빗물저류조의 용량인 것으로 판단된다. 따라서 지역별로 타당하게 제시될 일별 수요량, 빗물사용량에 따른 빗물저류조 용량별 편익, 빗물저류조 용량별 설치비용 등을 감안하여 빗물 저류조의 활용강우량 즉 빗물저류조의 용량을 결정하는 것이 합리적임을 보여주었다.

• 한국습지학회지
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• 제13권1호
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• pp.35-44
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• 2011

기후변동에 따른 식생반응 및 그에 따른 물수지 동역학의 변화를 살펴볼 목적으로 본 연구에서는 식생의 물 이용가능성과 식생 생산량의 지역별 연별 변동성을 분석하였다. 유역의 식생 물이용의 대리변수로서 습윤량에 대한 기화량의 비로 표현되는 Horton 지수의 계산을 통하여 유역에서의 수문 분할과 그에 따른 식생의 물 이용 가능성에 대한 정량화를 시도하였다. 연별 Horton 지수의 추정결과 기후의 변동성과 비교하여 볼 때 상대적으로 일정한 값을 유지하고 있는 것을 살펴볼 수 있다. 이와 더불어 Horton 지수와 식생의 강우이용효율을 비교한 결과, 물 이용가능성에 따른 식생의 물 이용에 대한 흥미로운 패턴이 있음을 살펴볼 수 있었다. 물이 식생 성장에 제한요소가 될 경우 식생의 강우이용효율은 공통적인 최대값으로 수렴한다는 선행연구들의 결과를 본 연구를 통해서도 확인할 수 있다.

• 한국습지학회지
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• 제18권4호
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• pp.481-487
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• 2016

본 연구는 도시 강우유출수 처리를 위한 하이브리드 빗물정원 시스템을 개발하고자 수행되었으며, Pilot scale 모니터링을 통하여 시스템 내의 서로 다른 구성요소간의 효율을 검증하였다. 유입수는 국내 외 도로강우유출수의 농도를 고려한 인공강우유출수를 이용하여 수행하였다. 모니터링 결과 하이브리드 빗물정원은 시설 내 저류 80%, 지하수의 침투 15%로 유입수의 약 95% 저감되는 것으로 나타났다. 이는 ST의 저류 및 PB와 IT의 침투 기작이 물순환 효과에 기여한 것으로 판단된다. 또한 오염물질 저감효율을 산정한 결과, TSS의 경우 평균 87%으로 나타났으며, 유기물은76%, 영양염류는 46%, 중금속은 56%으로 나타났다. 이는 PB와 IT에 포함된 여재의 여과, 침투 및 식생과 토양의 생물학적 흡수 기작 영향에 의해 나타난 결과로 판단된다. 이러한 연구 결과는 향후 빗물정원의 효율을 향상시키기 위한 시설의 개선 및 설계방안으로 활용 가능할 것으로 평가된다.

• Journal of Advanced Marine Engineering and Technology
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• 제32권7호
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• pp.1044-1050
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• 2008

Most of developed countries, the consumption of fossil fuels has been serious problems that cause serious environment pollution like acid rain, global warming. Also, we have faced that limitation fossil fuels will be exhausted. Currently, small hydropower attracts attention because of its small, clean, renewable, and abundant energy resources to develop. By using a small hydropower generator of which main concept is based on using the different water pressure levels in pipe lines, energy which was initially wasted by use of a reducing valve at the end of the pipeline, is collected by turbine in the hydropower generator. A propeller shaped hydroturbine has been used in order to use this renewable pressure energy. In this study, in order to acquire basic design data of tubular type hydraulic turbine, output power, head, efficiency characteristics due to the flow coefficient are examined in detail. Tubular-turbine among small hydraulic power generation can be used at low-head. The purpose of this study is to research turbine's efficiency due to runner vane angle using CFD analysis.

• 한국정보전자통신기술학회논문지
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• 제1권3호
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• pp.91-96
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• 2008

최근 네트워크대역 및 수신단말기의 해상도의 다양화에 의해 One Source-Multi use의 영상 전송을 구현하기 위한 기술로서 영상 확장적응성 기능이 주목받고 있다. 현재 MPEG에서는 H.264/MPEG-4 AVC를 기본으로 하는 SVC(Scalable Video Coding)의 표준화가 진행되고 있으며 SVC에서는 공간 시간 SNR 확장적응성을 제공할 수가 있다. 그러나 일반적으로 확장적응한 부호화는 비 확장적응한 부호화에 비해 부호화 효율이 떨어진다고 알려져 있다. 그래서 본 논문에서는 시간, SNR 확장적응성에 착안하여 SVC에 의한 확장적응성의 입자크기의 정도와 부호화 효율 관계를 기초로 하는 SNR 스케일러빌러티를 제공하는 FGS(Fine Granular Scalability) 기능을 전환함으로서 주관 품질의 향상을 꾀하는 수법을 검토한다.

• 한국농공학회논문집
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• 제55권6호
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• pp.19-30
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• 2013

This study is to evaluate the use of dual-polarization radar data for storm runoff modeling in Namgang dam (2,293 $km^2$) watershed using KIMSTORM (Grid-based KIneMatic wave STOrm Runoff Model). The Bisl dual-polarization radar data for 3 typhoons (Khanun, Bolaven, Sanba) and 1 heavy rain event in 2012 were obtained from Han River Flood Control Office. Even the radar data were overall less than the ground data in areal average, the spatio-temporal pattern between the two data was good showing the coefficient of determination ($R^2$) and bias with 0.97 and 0.84 respectively. For the case of heavy rain, the radar data caught the rain passing through the ground stations. The KIMSTORM was set to $500{\times}500$ m resolution and a total of 21,372 cells (156 rows${\times}$137 columns) for the watershed. Using 28 ground rainfall data, the model was calibrated using discharge data at 5 stations with $R^2$, Nash and Sutcliffe Model Efficiency (ME) and Volume Conservation Index (VCI) with 0.85, 0.78 and 1.09 respectively. The calibration results by radar rainfall showed $R^2$, ME and VCI were 0.85, 0.79, and 1.04 respectively. The VCI by radar data was enhanced by 5 %.

• Asian-Australasian Journal of Animal Sciences
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• 제18권2호
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• pp.296-300
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• 2005

Human-induced soil salinity is becoming a major threat to agriculture across the world. This salinisation occurs in both irrigated and rain-fed agricultural zones with the highest proportions in the arid and semi-arid environments. Livestock can play an important role in the management and rehabilitation of this land. There are a range of plants that grow in saline soils and these have been used as animal feed. In many situations, animal production has been poor as a result of low edible biomass production, low nutritive value, depressed appetite, or a reduction in efficiency of energy use. Feeding systems are proposed that maximise the feeding value of plants growing on saline land and integrate their use with other feed resources available within mixed livestock and crop farming systems. Salt-tolerant pastures, particularly the chenopod shrubs, have moderate digestible energy and high crude protein. For this reason they represent a good supplement for poor quality pastures and crop residues. The use of salt-tolerant pasture systems not only provides feed for livestock but also may act as a bio-drain to lower saline water tables and improve the soil for growth of alternative less salt tolerant plants. In the longer term there are opportunities to identify and select more appropriate plants and animals for saline agriculture.

• 한국농공학회논문집
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• 제53권5호
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• pp.9-16
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• 2011

Curve Numbers (CN) for the combination of land use and hydrologic soil group were regionalized at Imha Watershed using Long-term Hydrologic Impact Assessment (L-THIA) coupled with SCE-UA. The L-THIA was calibrated during 1991-2000 and validated during 2001-2007 using monthly observed direct runoff data. The Nash-Sutcliffe (NS) coefficients for calibration and validation were 0.91 and 0.93, respectively, and showed high model efficiency. Based on the criteria of model calibration, both calibration and validation represented 'very good' fit with observe data. The spatial distribution of direct surface runoff by L-THIA represented runoff from Thiessen pologen at Subi and Sukbo rain gage station much higher than other area due to the combination of poor hydrologic condition (hydrologic soil C and D group) and locality heavy rainfall. As a results of hydrologic condition and treatment for land use type based on calibrated CNs, forest is recommended to be hydrologically modelled dived into deciduous, coniferous, and mixed forest due to the hydrological difference. The CNs for forest and upland showed the poor hydrologic condition. The steep slope of forest and alpine agricultural field make high runoff rate which is the poor hydrologic condition because CN method can not consider field slope. L-THIA linded with SCE-UA could generated a regionalized CNs for land use type with minimized time and effort, and maximized model's accuracy.

• 한국실내디자인학회논문집
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• 제16권2호
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• pp.181-191
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• 2007

This study attempted to analyze the characteristics of interior design of the apartment units of Model-houses in terms of ecological aspects. 9 companies that possessed their model houses among the construction companies in Busan area as of August 2006 were selected. 20 units in the model houses of these companies were visited and analyzed. Through literature review, the guideline for the environmentally-friendly residential design was designed and developed to the checklists. The data collected were analyzed to find out the ecological characteristics of the interior space of apartment units. The findings are the followings. First, energy efficiency was properly considered in terms of natural lighting and natural ventilation. Second, in sustainability, the materials for floors and walls could not be reused even though they were environmentally-friendly. Water system needs more improvement for sustainable development including grey-water and rain recycling system. Third, interior greening should be applied more for better environment both physically and emotionally. It is expected that future housing will be more high-risen and densely-populated apartment spaces. Therefore, an approach to new ecological aspects including an emphasis on interior greening, use of eco-materials and adhesives, water recycling and flexibility of the spatial configuration should be made for the next generation.

• Journal of Forest and Environmental Science
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• 제40권2호
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• pp.99-110
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• 2024

According to the REDD+ program, it is necessary to monitor, quantify, and report forest conditions in protected land areas. The objectives of this work were to quantify the average monthly aerial net primary productivity (ANPP_MONTH) of semi-arid Chaco Forest at Copo National Park (CNP), Santiago del Estero, Argentina, during the period 2000-2023, as well as its spatial distribution and relationship, and its use efficiency (RUE) of average monthly rainfall (AMR). The ANPP_MONTH model accounted for 90% of the seasonal variability from October to May, the average seasonal ANPP_MONTH was 145 tons of dry matter per hectare (t dm/ha), being the maximum in January with 192 t dm/ha and the minimum in May with 91 t dm/ha. The surface area covered by ANPP_MONTH exhibited a consistent positive trend from October to May (t test=15.65, p<0.01). Strong and significant direct relationships were found between ANPP_MONTH and AMRs, linear models explaining 90% and 96% of the variability, respectively. The results obtained become reference values for assessing the capacity of the forest systems to stock carbon for global warming mitigation and for monitoring and controlling their response to extreme climatic adversities. The average ANPP_MONTH reduces uncertainty when defining the thresholds to monitor and quantify ANPP and forest area, thus facilitating the detection of negative changes in land use in CNP. Such results evidence the National Parks Administration's high effectiveness for the maintenance of protected area and for the high ANPP of the FCHS of CNP in the period 2000-2023.