• Proceedings of the KWS Conference
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• 1996.05a
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• pp.173-175
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• 1996

• Journal of Korean Society of Forest Science
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• v.103 no.3
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• pp.383-391
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• 2014

Long-term changes in the hydrological characteristics of a small forest watershed were examined using a master baseflow recession curve and the measured rainfall-runoff data from the experimental forest watershed in the measured years 2003-2011. The results of the study showed that the recession coefficient of direct runoff was lower than that of baseflow. In small forested watershed, the direct flow was lower than that of large scale watershed, flow due to its shorter period of occurrence. And baseflow was similar to large scale watershed's. A regression equation $y=0.7528e^{-0.022x}$($R^2=0.8938$, range 0.3~0.8 mm) was obtained using the master baseflow recession curve for the study period and the recession coefficient was calculated as K = 0.978. Changes between master baseflow recession curve and runoff showed great association and relevance such as increasing runoff was associated with the gentle slope of master baseflow recession curve and decreasing runoff was associated with the slope of master baseflow recession curve contrary. In the later years of the study period, the slope of the master baseflow recession curve appreciably became more gentle due to increases in baseflow. This suggests that the forested experimental watershed exhibit improved structural functioning of normal flood control and reduced occurrence of water shortage problems.

• Journal of Wetlands Research
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• v.21 no.1
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• pp.34-42
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• 2019

Baseflow which is one of the unmeasurable components of streamflow and slowly flows through underground is important for water resource management. Despite various separation methods from researches preceded, it is difficult to find a significant separation method for baseflow separation. This study applied the MRC method and developed the improved approach to separate baseflow from total streamflow hydrograph. Previous researchers utilized the whole streamflow data of study period at once to derive synthetic MRCs causing unreliable results. This study has been proceeded with total nine areas with gauging stations. Each three areas are selected from 3 domestic major watersheds. Tool for drawing MRC had been used to draw MRCs of each area. First, synthetic MRC for whole period and two other MRCs were drawn following two different criteria. Two criteria were set by different conditions, one is flow condition and the other is seasonality. The whole streamflow was classified according to seasonality and flow conditions, and MRCs had been drawn with a specialized program. The MRCs for flow conditions had low R2 and similar trend to recession segments. On the other hand, the seasonal MRCs were eligible for the baseflow separation that properly reflects the seasonal variability of baseflow. Comparing two methods of assuming MRC for baseflow separation, seasonal MRC was more effective for relieving overestimating tendency of synthetic MRC. Flow condition MRCs had a large distribution of the flow and this means accurate MRC could not be found. Baseflow separation using seasonal MRC is showing more reliability than the other one, however if certain technique added up to the flow condition MRC method to stabilize distribution of the streamflow, the flow conditions method could secure reliability as much as seasonal MRC method.

• Journal of Welding and Joining
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• v.20 no.4
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• pp.427-428
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• 2002

용접부의 균열 및 그 방지(Ⅱ)와 (Ⅲ)' 에서는 고온 균열의 종류와 특징, 발생기구 및 방지대책에 대한 일반적인 내용을 언급하였다. 여기서는 실용 재료를 중심으로 하여 그들 재료의 고온균열감수성과 방지 대책에 대하여 간략하게 소개하기로 한다.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.22 no.2
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• pp.80-92
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• 1977

This experiment investigated the effect of various moisture levels on the top and root growth of barley and its yield. Resistant varieties to excess moisture injury shortened plant height, but tillered more, having creeping plant type compared with ordinary one, and greater portion of root of this varieties occured at the deeper soil depths with longer root length. However, susceptible one to excess moisture injury showed an inversed trend when compared with the untreated one. Oversaturated treatment compared with the untreated increased a little bit soil temperature and Eh of soil. Increased root activity and increased yield were obtained with resistant varieties compared with the untreated. Lower root activity and less yield than those of the untreated were observed in both extreme treatments. Yield reduction in both the extreme treatments was mainly due to reduction of tiller number, grain number and 1, 000-grain weight. Highest yield reduction was marked at the stage of internode elongation in the oversaturated and at the booting stage in the overdried treatment.

• Proceedings of the KWS Conference
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• 1998.10a
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• pp.301-302
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• 1998

• KOREAN POULTRY JOURNAL
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• v.6 no.2 s.52
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• pp.33-36
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• 1974

농수산부는 11월 29일자로 1974년도 부로일러종계 114,000수 이외의 종계도입을 중단하기로 하였다. 년간 30-70만불의 액수는 얼마 안되지만 사료도 90$\%$이상 외국에 의존하고 있는데 병아리까지 의존할 수 없다. 능력이 엄청나게 차이나면 모르되 외국계에 비하여 손색이 없는 국산계를 두고 외국계를 도입할 필요는 없는 것이다. 무슨 일이든지 질서를 잡자면 그 과정에서 다소의 차질과 시행착오는 감수하여야 하는 것이다. 양계산업의 국산화율을 높이기 위하여 종계 도입중단은 시기 적절한 조치라고 생각한다.

• Geophysics and Geophysical Exploration
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• v.17 no.3
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• pp.147-154
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• 2014

For analyzing the distribution of chromite, magnetic survey was carried out on the chromium mineralized belt in Bophi Vum area, northwestern Myanmar. As a result, the magnetic susceptibility of chromite is lower than those of dunite and harzburgite, which are background rocks of chromite. Also, the locations of low magnetic anomaly zone and low magnetic susceptibility models of 3D magnetic inversion result are spatially well matched with those of chromite occurrences confirmed by the surface geological survey and trench survey. Some of low magnetic effects are expanded to the periphery area of chromite occurrences. Considering the magnetic susceptibility characteristics of various rocks in this area, the expanded low magnetic anomaly zones are estimated as the high potential areas bearing chromite. For confirming the potential area of chromite pointed by coarse magnetic survey, the additional detail exploration need to be carried out in future.

• Food Industry
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• s.15
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• pp.89-104
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• 1973

지난해부터 세계의 식량사정이 핍박해져서 소맥을 위시해서 옥수수, 콩등 많은 농산물가격이 폭등하고 있어 우리나라에서도 여러 방면으로 시련을 겪고 있을 뿐아니라 항간의 화제도 끝일날이 없다. 이와같은 내외의 식량을 둘러싼 환경변화를 어떻게 포촉해 나갈 것인가하는것이 식품공업계의 비상한 관심거리다. 본지에서도 미국농무성시장경제부소속의 카미트 버어드박사 감수에 의한 논문을 요약해서 소개하고저 한다. 본지에서는 지면관계로 극히 중요한 식품관계 사정만을 추려서 중점적으로 계재하겠다.

• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.344-344
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• 2021

세계적으로 기후변화 현상으로 인해 극심한 이상 가뭄이 빈번하게 발생하고 있다. 물 공급 소외지역의 경우 가뭄으로 인해 주민들이 불편을 겪고 있으며, 특히 마을상수도 및 소규모수도시설에 의존하는 최상류부 유역의 취수원은 상대적으로 가뭄에 취약하다. 본 연구의 대상 지역은 강원도 춘천시 물로천의 제1지류 유역으로 주민들이 하천 계곡수를 생활용수의 주 공급원으로 사용하고 있다. 해당지역은 갈수기에 생활용수 부족 문제를 겪고 있는 지역으로 가뭄 대응을 위한 구조적 대책으로 다단식 Sand댐을 설치할 예정이다. 현장조사 결과 물로천의 물은 취수조로 일부 유입되며, 자갈 등을 이용하여 부유물 등이 필터링되어 물탱크로 흘러내리며 중력에 의해 각 가정으로 자연 유하하는 것으로 나타났다. 본 연구에서는 대상지역의 하천, 취수조, 물탱크 3개 지점에 압력식 자동 수위 관측기를 설치하였으며, 2시간 간격의 수위를 측정할 수 있도록 설정하여 매달 유속 측정을 통해 수위-유량 관계 곡선식을 바탕으로 유량을 산정하였다. 도출된 일별 유량 자료와 SWAT 모형의 매개변수 검·보정한 후 이를 장기간으로 확장 적용하여 약 10년간의 장기 유출량을 산정하였다. 일별 장기 유출량 자료를 통해 평균 유량 감수곡선과 감수곡선식을 도출하였고, 무강우에 따른 최대 공급가능일수를 산정하였다. 본 연구에서는 하천-취수원 연계 모니터링 및 하천 유량에 따른 공급가능일수 등을 제시하여 가뭄 취약지역의 주민 불편을 최소화하고 가뭄에 대응할 수 있을 것으로 판단된다. 최종적으로 추후 Sand댐 건설 전후 비교 자료로 사용될 수 있으며, 소규모수도시설의 가뭄 관리를 위한 모니터링 체계 및 대응 방안을 구축하였다.