• 한국태양에너지학회 논문집
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• 제32권4호
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• pp.59-64
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• 2012

The correlation between hydrologic performance design parameters of small hydro power(SHP) sites and rainfall condition have been analyzed for major river systems. The model, which can predict flow duration characteristic of stream, was developed to estimate the inflow caused from rainfall. And another model to predict hydrologic performance for SHP plants is established. Based on the models developed in this study, the hydrologic performance characteristics for SHP sites have been analyzed. The results show that the hydrologic performance characteristics of SHP sites have some difference between the river systems. Especially, the specific design flowrate and specific output of SHP sites located on North Han river and Nakdong river systems have large difference compared with other river systems. It was found that the hydrologic performance design parameters such as specific design flowrate and specific output were affected by rainfall condition in basin area of SHP sites.

• 한국산학기술학회논문지
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• 제11권12호
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• pp.5042-5048
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• 2010

유비쿼터스 환경에서 다양한 센서로부터 생성되는 데이터 스트림에 대해 사용자가 요구하는 위치 기반 서비스를 효과적으로 지원하기 위해 연산자 네트워크와 공유 등을 통한 연속 질의 처리 기법이 활용되고 있다. 위치 정보 기반의 연속 질의 처리는 특정 영역을 중심으로 유사 질의가 집중적으로 발생할 수 있으므로, 본 논문에서는 유사한 조건을 갖는 공간 연산을 공유하기 위해 그리드 영역 분할을 이용한 공간 연산 공유 기법을 제안한다. 제안기법은 공간 연산을 직접 공유하지 않고 그리드 셀 별로 이동객체를 공유하기 때문에 유사한 조건을 갖는 공간 연산의 공유가 가능하여 공간 연산의 실행 빈도수를 크게 감소시켜 질의 처리 속도의 향상과 함께 메모리 이용률을 향상시킨다.

• 한국농공학회논문집
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• 제54권1호
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• pp.55-62
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• 2012

This study is to assess the reduction of nonpoint source pollution by applying Best Management Practice (BMP) in Chungju-dam watershed (6,585.1 $km^2$) using Soil and Water Assessment Tool (SWAT). The model was calibrated using 3 years (1998-2000) daily streamflow at 3 locations and monthly water quality of sediment (SS), total nitrogen (T-N) and total phosphorus (T-P) data at 2 locations and validated for another 3 years (2001-2003) data. The 5 BMPs of streambank stabilization, porous gully plugs, recharge structures, terrace, and contour farming were applied to stream and area with the specific criteria of previous researches. Through the parameter sensitivity analysis, the farming practice P-factor and Manning's roughness of stream were sensitive. Overall, the NPS reduction effect was high for streambank stabilization, terrace, and contour farming. At the watershed outlet, the SS, T-P, and T-N were reduced by 64.4 %, 62.8 % and 17.6 % respectively.

• 생태와환경
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• 제48권4호
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• pp.280-286
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• 2015

점봉산의 한 소하천에 서식하는 녹색강도래 Sweltsa illiesi와 S. lepnevae의 생활환이 추정되었다. 약충은 DNA barcode로 동정되었다. 이들의 약충은 성충으로 우화하기 몇 달 전부터 머리에 종 특이적 무늬가 나타났으며, 더듬이 셋째 마디의 모양이 서로 달랐다. 두 종은 거의 동일한 semivoltine 생활환을 가지며, 산란된 알은 6월에 부화하여 약 701일의 생육기간을 보내는 것으로 나타났다. 두 종의 통합된 연평균 생물량은 회분외질량 (AFDM)으로 $96mg\;AFDM\;m^{-2}$으로 추정되었다. 통합 2차생산력은 size frequency법으로는 373 mg, increment summation법으로는 $297mg\;AFDM\;m^{-2}\;yr^{-1}$인 것으로 추정되었다.

• 한국환경복원기술학회지
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• 제21권4호
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• pp.25-42
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• 2018

The purpose of this study is to present the basic data for management of ecologically restored stream by surveying and analysing the vascular plants distributed in Chunghyocheon stream, Gyeongju-si. The survey of vascular plants in this site was conducted before and after restoration. The number of vascular plants were summarized as 276 taxa including 68 families, 188 genera, 242 species, 1 subspecies, 29 varieties and 4 forms. The rare plants were 2 taxa including Prunus yedoensis Matsum. and Iris ensata var. spontanea (Makino) Nakai, and the Korean endemic plant was Lespedeza maritima Nakai. The specific plants by floristic region were 13 taxa including 1 taxa of grade V, 3 taxa of grade III, 1 taxa of grade II and 8 taxa of grade I. The naturalized plants were 62 taxa including Persicaria orientalis (L.) Spach, Lepidium virginicum L., Poa compressa L. and so forth. The invasive alien plants were 3 taxa including Ambrosia artemisiifolia L., Aster pilosus Willd. and Lactuca scariola L.. The hydrophytes were 34 taxa including 26 taxa of emergent plant, 1 taxa of floating-leaved plant, 2 taxa of free-floating plant and 5 taxa of submerged plant.

• 한국농공학회지
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• 제38권3호
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• pp.127-136
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• 1996

The purpose of this study is to provide with information for the water resources development and management in stream management planning, such as information on the sediment trensport, design of dam and water facilities, river improvement and flood plains management. The major results obtained from the field measurement and analysis of the watershed characteristics, hydraulic and sediment characteristics are as follows ; 1. The rating curve formulas obtained from the analysis of the hydraulic characteristics data collected are ; Q-=110.563 $(H-0.474)^2$ for 0.7m$(H-0.146)^2$ for 0.4m$Sr=aX{^2} {_1} X^{c}{_2}$, in the experimental watershed.

• 전기전자학회논문지
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• 제21권1호
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• pp.92-95
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• 2017

본 논문에서는 적은 면적의 GP-GPU에서 성능을 향상시키기 위한 방법을 제안한다. 본 논문에서는 superscalar와 같이 과도하게 스케줄링 복잡성을 증가시키지 않는 대신 단순한 코어의 수를 늘려 성능을 극대화 시키는 방법을 제안한다. GP-GPU를 구성하는 Stream Processor의 구조를 단순화한다. 또한, Warp Schedule에서 thread 할당을 어플리케이션에 적합한 방법을 개발하여 성능을 개선한다. 성능을 검증하는 방안으로 neural network의 한 분야인 딥러닝에 대한 스레드 할당방식을 제안한다. Neural Network 알고리즘의 경우 Intel CPU 대비 90%에서 ARM Cortex-A15 4 core 대비 98% 성능 향상을 확인할 수 있었다.

• 한국환경복원기술학회지
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• 제23권6호
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• pp.87-107
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• 2020

The purpose of this study is to present the basic data for maintenance and management of river ecosystem by surveying and analysing the kinds and their characteristics of vascular plants in Bukcheon stream, Gyeongju-si, South Korea. The numbers of vascular plants were summarized as 428 taxa including 92 families, 265 genera, 3 subspecies, 24 varieties, 6 forms, 5 hybrids and 5 cultivars. Among the identified taxa, there were 90 planted species. The endangered wild species was Cicuta virosa, and the rare plants were 5 taxa including Prunus × yedoensis, Juniperus chinensis L. var. sargentii and so on. The Korean endemic plants were 5 taxa Populus × tomentiglandulosa, Salix koriyanagi, Lespedeza maritima, Forsythia koreana and Aster pseudoglehni. The specific plants by floristic region were 26 taxa including 2 taxa of grade V, 3 taxa of grade IV, 2 taxa of grade III, 8 taxa of grade II and 11 taxa of grade I. The naturalized plants were 81 taxa including Euphorbia maculata, Erigeron strigosus, Vulpia myuros and so on. The invasive alien plants were 7 taxa including Humulus scandens, Rumex acetosella, Ambrosia artemisiifolia, Ambrosia trifida, Lactuca seriola, Symphyotrichum pilosum and Paspalum distichum.

• 한국환경복원기술학회지
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• 제23권3호
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• pp.23-43
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• 2020

The purpose of this paper is to create ecological values for urban rivers. For this, the paper looks into river bed structures and how nearby lands are used. This study was performed to set the specific sections for analysis through a field investigation of the infrastructure conditions, surrounding land use, and the inter habitat structure of Seongnaecheon(Stream). A total of 780 individuals from 31 species of wild birds appeared in Seongnaecheon(Stream). According to foraging guild's habitat, there were 9 species of water, 8 types of water edges, 5 types of crowns, 5 types of shrubs, 2 types of tree trunks, 2 types of birds of raptors, and 355 individuals of water, 243 shrubs, 90 crowns, 84 water edges and 5 raptors. Many water birds were observed at the site where the Seongnaecheon(Stream) sandy plains and wetland herbaceous area were developed and the open water was secured. Most of the forest birds appeared on levee slope connected with forest around and riverside with fewer facilities for use. The species diversity index of Shannon, the entire section of Seongnaecheon(Stream), was 2.2697 and the downstream ecological landscape conservation area of Seongnaecheon(Stream) was found to be useful as a habitat for wild birds in the city compared to other sections. Some sections of Seongnaecheon (Stream) had low species diversity index due to lack of green space and surrounding urbanization areas. In choosing target species, I researched the special features of the habitats and the habitation structure of wild birds in each zone. Regarding detailed plans, by classifying the breeding place & roosting site and the roosting site & shelter that took account of the inhabitation characteristics of the target species in different sections, this paper suggested the major plant species and multilayer planting structures. Moreover, this study proposed the development of habitats for water birds and forest birds along with the connection of the green network for improving the Eco-corridor linkage and inhabitation features in Seongnaecheon(Stream).

• 자원환경지질
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• 제27권1호
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• pp.101-113
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• 1994

강원도 상동지역의 옥동천 및 그 지류들을 대상으로 수질 파라메터(Eh-pH, 부유물질)의 측정과 하상퇴적물의 화학분석을 통하여 석탄광 및 금속 광산활동에 의한 옥동천의 수성 환경의 오염정도를 조사하였다. 옥동천의 조사유역을 상부와 하부 옥동천으로 구분할 때 상부 유역은 석탄광의 개발로 인한 황화물의 산화작용으로 인하여 수질은 매우 낮은 pH를 나타내 광산 산성수(Acid Mine Drainage)로 심하게 오염된 것으로 조사되었다. 또한 상부 옥동천에 용존된 철이 지류들의 유입과 하천의 aeration으로 철 산화물(floc)의 발생과 이의 침전으로 하천 바닥은 황갈색의 철산화물이 퇴적되어 있다. 그러나 상부 옥동천의 유속에 의해 일부 철 산화물이 침전되지 못한채 부유되어 옥동천은 매우 탁하게 보인다. 상부 옥동천온 천평천의 유입으로 인하여 낮은 pH의 산성수는 중화되지만 부유물질의 존재로 인하여 하부 옥동천은 계속 탁하여 광산 산성수의 영향이 지속되고 있다. sediment quality criteria와 비교해 볼 때 하부 옥동천의 하상퇴적물, 특히 상동 텅스텐-모리브덴늄 광미 저장댐과 인접된 지점의 하상퇴적물은 Pb, Cu, Zn, Co, Cd, As 및 Bi 등의 유해금속에 의해 농축되어 있어 퇴적물의 질이 상당히 악화되어 있다. 수중 및 저서 생물에 대한 서식처 및 수질을 개선하기 위해서 옥동천 상부에는 산성수를 중화시킬 수 있는 경제성 있는 수처리 장치의 도입과 중금속의 speciation의 연구가 필요할 것으로 사료된다.