• 한국육종학회지
• /
• 제41권4호
• /
• pp.369-376
• /
• 2009

Cowpea might have been introduced from China to Korea and cultivated for several hundred years but it has never been a staple food crop in Korea. In this study, genetic diversity of 492 Korean cowpea landrace accessions that have passport information was estimated using six SSR markers. The mean of Weir's gene diversity was 0.665 from all accessions investigated in the study. Cowpea gene diversity of six local provinces in Korea was ranged from 0.370 in accessions of Gangwon to 0.680 in Jeonra provinces. Low gene diversity of the cowpea genepool of Gangwon province was probably derived from relatively few introductions. Especially SSR markers VM36 and VM39 seem to be good markers to distinguish the Gangwon accessions from others by occurring at a specific locus with higher than 78% of allele frequency. Except for the Gangwon province with the low genetic diversity, gene diversity of cowpea accessions from other provinces was ranged from 0.600 to 0.680 indicating no big differences among provinces. Distribution pattern of the allele frequencies was similar among the other provinces. This may reveal that Korean farmers might exchange cowpea seeds easily with even their neighbors with geographical barriers. A core collection, 100 landraces, ca. 20% of base collection, was developed at the 70% of a similarity coefficient level using random sampling approaches after stratification of the entire landrace collection based on the phenetic dendrogram. The variability of SSR in the base and core collections of Korean cowpea landrace was compared by calculating Weir's gene diversity. The mean of Weir's gene diversity of the core was 0.707 while that of the base collection was 0.665. The higher diversity index in the core collection indicates that it maintains the initial variability and well represents the base collection. The core collection included one of determinate accession (IT 216155) and two of no branching type accessions (IT 103959 and IT 161024). The core collection could be used to guide more efficient management and utilization of the entire collection. This core collection should be revised periodically as additional accessions are collected and further characterization is conducted.

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2006년도 학술발표회 논문집
• /
• pp.540-545
• /
• 2006

The objective of the study is to assess the water quality improvement resulted from the rearrangement of the irrigation water supply systems at Mankyeong River and Ansung Chun basin. There is a mixed type of watershed composed of urban and rural areas in the region. The water intake facilities for agricultural use such as reservoir, weir and pumping station are generally located at upstream river where the water quality maintains relatively clean. However, this study focuses on moving the water intake to downstream and rearranging the irrigation water supply system, then investigating how effective they are for water quality improvement in the river. When the water intake is moved downstream, the stream flow is increased as much as the amount of irrigation water that is to be taken upstream. The augmented flow which is frequently referred to as environmental flow can function as dilution water for improving the quality of polluted water that is originated from the wastewater in tributaries.

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2009년도 학술발표회 초록집
• /
• pp.1827-1831
• /
• 2009

본 연구에서는 래버린스 형태 중 비교적 연구가 거의 되어 있지 않은 직사각형 래버린스 위어의 유량특성을 분석하여 월류량 증대효과를 분석하고자 하며 직사각형 래버린스 위어의 복잡한 흐름현상을 구현하기위해 수리모형실험을 수행하였다. 수리모형실험은 직사각형 래버린스 위어의 다양한 형상을 고려하기 위해 유효길이와 위어 폭 비(L/W)의 범위를 2, 4, 6, 8, 10으로 적용하였다. 또한, 수리모형실험에서 수심 변화에 대한 범위는 전수두와 위어 높이의 비를 0.05에서 0.75범위로 수행하였다. 직사각형 래버린스에 대한 유량 특성을 유량비와 유량계수 곡선을 이용하여 월류량 증대효과를 분석하였다. 그 결과, 직사각형 래버린스 위어의 유량비는 L/W가 증가할수록 감소하는 경향을 나타냈으며, 전수두 비$(H_t/P)$가 증가할수록 작아지는 경향을 나타냈다. 즉, 일반 선형 위어보다 월류량 증대하는 효과가 낮은 전수두 비에서 발생하는 것으로 분석되었으며, 월류량 증대를 위한 수공구조물 설계의 기초자료로 활용이 가능할 것이다. 향후, 유량계수를 예측하는 관련 식이나 기법을 개발하여 효과적으로 래버린스 위어의 유량을 산정할 수 있을 것이다.

• 전기학회논문지
• /
• 제57권1호
• /
• pp.137-141
• /
• 2008

Biochip, which implements bioanalytical process on a tiny surface, is one of candidates for medical diagnosis, drug screening, and molecular sensing. In general, a type of biochip based on microfluidics is composed of microcomponents including microchannel, pump, and valve, which require complicated processes. In this study, gray-scale photolithography(GSPL) was applied to fabricate a biochip with multiple layers. A mould for casting PDMS(polydimethylsiloxane) channel, was fabricated using GSPL. A gray-photomask was prepared by printing gray patterns on a high-quality glossy paper followed by photoreducing by 10:1 onto the photo-film. The formation of multiple layers was studied according to the change of gray level of pattern and the developing time. A biochip composed of a weir(multiple layer structure) and a reaction chamber in a single microchannel was fabricated in a glass plate. Finally, we investigated the application of biochip to antigen-antibody reaction by packing the microbead coated with antibody.

• 한국세라믹학회지
• /
• 제35권2호
• /
• pp.201-207
• /
• 1998

A tube-type filter dam(or baffle with holes) for ferrous melt refining is applied to the tundish operation for molten steel having low carbon and ultra-low carbon. The changes in the total oxygen content insoluble aluminum content and the distribution of inclusion size in molten steel during tundish operation were in-vestigated at the pouring part strand and mold of tundish. Removal mechanism of inclusions is considered to be caused by buoyancy action of the filter dam better than filtration action and the size range of in-clusions filtrated by the filter dam was for 30-50$\mu\textrm{m}$. Decrease in deviation of inclusion content in molten steel was confirmed for appling the filter dam in comparison with using conventional dam and weir. Also the filter dam had the advantage of baffle with holes at lower part in the efficiency of inclusions removal.

• Journal of applied mathematics & informatics
• /
• 제32권3_4호
• /
• pp.359-375
• /
• 2014

In this paper, a multiobjective nondifferentiable fractional programming problem (MFP) is considered where the objective function contains a term involving the support function of a compact convex set. A vector valued (generalized) ${\alpha}$-univex function is defined to extend the concept of a real valued (generalized) ${\alpha}$-univex function. Using these functions, sufficient optimality criteria are obtained for a feasible solution of (MFP) to be an efficient or weakly efficient solution of (MFP). Duality results are obtained for a Mond-Weir type dual under (generalized) ${\alpha}$-univexity assumptions.

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2011년도 학술발표회
• /
• pp.69-69
• /
• 2011

영산강 수계인 함평지역의 면적이 13.69ha인 논 유역에 건설기술연구원에서 개발된 수문모형인 CAT 모형을 적용하였다. 이 유역에서는 배수를 위해 플라스틱 파이프로 된 배수공을 쓰고 있으며, 배수공은 기존의 Weir Type의 물꼬와는 상이하게 Orifice 형식의 수리적 특성을 갖는다. 이러한 조건에 맞는 수문분석을 위해서 CAT 모형에 배수공을 위한 모듈이 추가되었으며, 현장 계측 자료를 이용한 적용성 평가가 요구되고 있다. 본 연구에서는 2008년부터 2010년까지 대상지역 논에서 모니터링 한 강우-유출 자료를 이용하여 논에서의 물수지 분석을 위한 CAT 모형의 적용성을 평가하였다.

• 한국농공학회지
• /
• 제37권3_4호
• /
• pp.82-89
• /
• 1995

The efforts of formulation have been reviewed and the results of existing laboratory experiments are investigated in order to describe the contracted flow which occurs at the final closure of sea dike construction. The regional characteristics of contracted flow is analyzed by checking the drawdown curve, and Chezy's mean velocity equation is employed to estimate the discharge rate at the closure. Weir-type discharge equations are reviewed, which are derived from Bernoulli equation, and the problems of the equations are discussed. Chezy's mean velocity equation is considered to be widely and generally applicable, and the empirical factor introduced in Chezy's equation is named 'form drag factor' since it is primarily dependent on the form drag caused by the contraction of discharge area. Laboratory experiments were conducted mainly in order to investigate the variation of form drag factor against various parameters, and an empirical equation is developed for the estimation of form drag factor.

• 한국수자원학회:학술대회논문집
• /
• 한국수자원학회 2017년도 학술발표회
• /
• pp.58-62
• /
• 2017

우리나라는 하상계수가 큰 하천의 특성 때문에 년 중 일정한 하천수위를 유지하기 어렵다. 더욱이 지류하천의 중 상류는 갈수기에는 건천화가 발생하곤 하며, 홍수기에는 빠른 유속으로 하류의 홍수위를 상승시키곤 한다. 따라서 지류하천 중 상류에는 수위조절 기능을 가지는 가동보를 설치하여 저류와 분배기능을 부여하고, 수재해 예방에 활용할 필요가 있다. 본 연구에서는 부력 승강식 가동보에 의한 수위자동조절 효과를 금강 지류인 치성천의 중 상류를 대상으로 수문학적 홍수추적 방법을 이용하여 분석하고, 성능구현을 위한 조건들을 검토하였다. 부력 승강식 가동보는 저류와 자동방류 기능으로 홍수기에는 하류의 홍수위 완화에 효과적이었으며, 다단으로 연속 배치할수록 효과는 향상되는 것으로 분석되었다.

• 한국전산유체공학회지
• /
• 제20권3호
• /
• pp.15-19
• /
• 2015

A fishway is a structure on or around artificial and natural barriers, such as dams, locks and waterfalls, to help fishes' natural migration. In this paper, a computational fluid dynamics (CFD) code, termed SNUFOAM is used to analyze vertical hydraulic characteristic of rollway of fishway. Volume-of-fluid (VOF) method was used to handle free-surface. It is important to determine the factors influencing flow characteristics in fishway because fish use directional information from the flow characteristics to navigate through fishway. Fishway was modeled in 2-D and the influence of the stream velocity, slope, and weir height of fishway was tested. In results, the transition Reynolds number was $2{\times}10^5{\sim}3{\times}10^5$.