• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2011년도 학술발표회
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• pp.389-389
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• 2011

과거의 무분별한 수자원 개발에 따른 자연환경파괴로 인해 점차 대규모 다목적댐의 건설과 같은 신규 수자원 개발이 쉽지 않은 상황이지만, 여전히 댐은 유한의 수자원을 적극적으로 확보하기 위한 가장 대표적인 방법으로서, 안정적인 용수 확보를 통한 물부족의 해소와 효율적인 운영을 통한 홍수와 가뭄 피해 예방을 위해 중요한 역할을 해오고 있다. 댐의 건설로 인해 하류측 본류에서는 과거와 같은 유량의 극심한 계절적인 편차는 감소되었으며, 가뭄이나 홍수에 대한 피해 규모도 저감되었다고 볼 수 있다. 댐 건설에 따른 수문학적 변화에 대한 분석은 실제 댐 건설 전후의 장기적인 관측자료를 비교하는 것이 가장 정확한 방법이나, 대부분 관측자료가 전무하거나 충분하지 못하기 때문에 일반적으로 모델링을 통해 장기간의 유출자료를 추정한 후 이를 기반으로 그 영향을 평가하고 있다. 모델링 방법으로는 과거부터 오랫동안 국내 수자원 해석 및 계획에 폭넓게 활용되고 있는 TANK 모형을 비롯하여, SSARR, NWS-PC, TOPMODEL, HSPF, PRMS, SLURP, SWAT, MIKE-SHE 등 다양한 모형들이 적용되고 있다. 이 중에서 SWAT은 유역의 수문 수질의 시공간적인 해석 및 관리, 그리고 미래 유역환경변화에 따른 영향 평가 등을 위해 국내는 물론 국제적으로도 많이 적용되고 있는 모형이다. 본 연구에서는 SWAT 모형을 국내 유역 특성에 적합하도록 개선한 SWAT-K 모형을 이용하여, 금강유역에서의 대청댐 및 용담댐의 운영과 인위적인 용수 이용에 따른 유출량, 증발산량 및 지하수 함양량 등의 수문성분의 변화를 분석하였다. 대청댐의 건설과 유역내 용수 이용으로 인해 하류측 공주지점에서의 유출량은 자연상태에 비해 증가하는 것으로 나타났으며, 지하수 함양량과 증발산량은 감소하는 것으로 분석되었다.

• 한국농공학회논문집
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• 제52권3호
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• pp.47-55
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• 2010

Investigations on the inundation damage and improvement measures were carried out centering around the protected horticultural complex concentrated in lowlands on the side of Geum river, in Nonsan and Buyeo, Chungnam. Most greenhouses were single-span plastic houses in this area, and tomato, strawberry and watermelon were cultivated mainly. 45.8 % of whole farmhouse were experienced in damage by inundation, and a frequency of the damage was average once in 11 years. The most urgent problem at the greenhouse culture in this area was showed in order of drainage improvement, irrigation water resources and energy saving. Consideration items in drainage improvement project for protected horticulture were showed in order of extending drain pumps, extending drain canals, using concrete flume in drain ditch. It needs to consider systematic plans that can restrain new establishment of greenhouses on the lowland paddy field in drainage area. It is difficult to remove greenhouses which are already established or prohibit cultivation. Therefore we should impose minimum duty items so that greenhouse tillers can cope with inundation. And it is thought that managing agency need to minimize farmers damage by improving drainage ability and introducing maintenance pattern that is different from rice cropping.

• 대한설비공학회:학술대회논문집
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• 대한설비공학회 2005년도 동계학술발표대회 논문집
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• pp.427-432
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• 2005

This study developed a program for detecting charged refrigerant amount in system air-conditioner. System air-conditioner is an air-conditioning system with multiple indoor units. Due to the complexity of the system, it is more difficult to detect the refrigerant amount charged in system air-conditioner than in a general single air-conditioner. Experiments were performed for 6 HP outdoor units with 3 indoor units in a psychrometric calorimeter. The experimental amount of charged refrigerant were ranged from 60% to 140% with 10% increasement. Fuzzy algorithm were emploeed for detecting the charged refrigerant amount in a system air-conditioner. The experimental data were used for curve fitting for general ranges for indoor and outdoor temperature conditions. membership function were determined for whole ranges of experimentally measured data and rulebase were defined for each amount of refrigerant charge. Developed program successfully predicted the measured data within 10% resolution range.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2003년도 하계학술대회 논문집 B
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• pp.964-966
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• 2003

The three-phase induction motor is rugged, reliable, long-lived, self-starting, smooth-running. But it is relatively inexpensive and three-phase power in not available everywhere, so if possible we need single-phase motor with the same characteristics. In fact, single-phase induction motors have excellent characteristics and outnumber the three-phase variety. Most of the small electric motors used in home, farm, or office are single-phase induction motors of one type or another. This electric motors application field need most energy saving type drive according to enlargement of electronic goods and to tend high class. The paper is proposed a various phase control methods for energy saving of single- phase induction motor. The controllers that are embodied by each method can use by various usage according to each performance and it is considered that application may help in the electrical energy saving because is possible to other electrical appliances.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2018년도 학술발표회
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• pp.211-211
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• 2018

미해양대기청 기후예측센터(Climate Prediction Center, NOAA)에서 제공하고 있는 기후지수(climate indices)를 예측인자로 하고 금강유역의 5~6월의 강우량을 예측대상으로 하는 원격상관기반 통계모형을 구축하였다. 1988년부터 2017년까지의 30년 자료에 대해 예측인자와 예측대상간의 시간지연상관분석을 수행한 결과 NAO(North Atlantic Oscillation), EP/NP(East Pacific/North Pacific Oscillation), EA(East Atlantic Pattern), WP(Western Pacific Index) 등과 상관성이 높은 것으로 분석되었으며, 이러한 시간지연 기후지수를 이용하여 4개월전에 5,6월 강수량을 예측할 수 있는 다중회귀모형을 개발하였다. 관측 강우량 아노말리가 큰 경우에는 다소 과소 예측되고, 아노말리가 작은 경우에는 다소 과다 예측되는 경향을 보였지만 관측 강우량과 예측 강우량간의 상관계수가 0.75로서 비교적 우수한 예측 결과를 나타내었다. 5~6월 강우량 아노말리의 3분위 예측성을 평가한 결과 평년이상 적중률은 77.8%, 평년수준은 81.8%로서 예측 성공률이 높았으며, 5, 6월 누적강우량이 매우 작았던 92년과 95년을 제외하고는 강우량이 적은 해에도 예측성이 우수하여 평년이하 적중률이 70.0%를 나타내었다. 따라서 본 개발모형은 최소 4개월 이전 선행시간을 가지고 늦봄, 초여름강우량을 예측할 수 있는 저비용의 가뭄 예측 도구로 유용하게 활용될 수 있을 것이다.

• 한국임상수의학회지
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• 제41권2호
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• pp.112-116
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• 2024

Uterine rupture is uncommon in small animals and can be caused by trauma, infection, dead fetus, or inappropriate obstetric techniques. A 4-year-old, intact female mixed-breed dog weighing 3 kg presented for elective ovariohysterectomy with a history of a motor vehicle accident two months previously. The patient showed no clinical signs of uterine abnormalities or evidence of pregnancy during physical examination. Clinical examinations, radiography, and ultrasonography revealed no significant findings. During ovariohysterectomy, a completely transected left uterine horn and dome-shaped ends were identified. The uterine layers were everted such that the endometrium could be seen outside the uterine horn. The dog recovered without post-operative complications and was discharged the following day. This report describes a rare case of an asymptomatic uterine rupture caused by trauma in a non-gravid dog.

• 생약학회지
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• 제22권3호
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• pp.171-182
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• 1991

Several experiments were carried for the purpose of establishing the basis for the quality evaluation of deer horn. Deer horn originated from China, New Zealand, Soviet and Alaska were used as objectives and some constituents involved in deer horn were assayed and compared with one another. Five kinds of trace elements including Ca and Fe were determined by atomic absorbance spectroscopy. The more the region came down from the top of the deer horn, the more the ratio of Ca to Fe content (Ca/Fe) was increased. The same increasing tendancy was observed in the case of ash content. Gangliosides were isolated from deer horn by alumina column chromatography and identified by TLC using gangliosides Type II obtained from bovine brain as the standard material. The TLC chromatograms were scanned by dual wavelength TLC scanner, then those TLC profiles were compared. Deer horn from China and New Zealand were analogous but those from Soviet and Alaska were each distinguished in their TLC profiles.

• International Journal of Industrial Entomology and Biomaterials
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• 제25권2호
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• pp.153-157
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• 2012

Many studies have explored suppression of aflatoxin produced by Aspergillus Genus. On the other hand, this study examined the inhibitory effect of the culture broth extract (CE) of A. tamarii obtained from dead silkworm on nitric oxide (NO) production and its antioxidative activity. The culture broth was extracted with EtOAc, dried, and then used in this experiment. As a result, CE did not show cytotoxicity on RAW 264.7 cells at any concentration. Moreover, CE suppressed lipopolysaccharide (LPS)-induced NO production of RAW 264.7 cells in a dose-dependent manner. The total phenol content according to the Folin-Dennis method, the antioxidative activity by DPPH, and the nitrate radical scavenging capacity of CE were increased in a dose-dependent manner. Thus, many of the phenolic compounds were considered to represent the antioxidative activity.

• Journal of Applied Biological Chemistry
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• 제56권3호
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• pp.179-181
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• 2013

Repeated $SiO_2$ and octadecyl silica gel (ODS) column chromatographies of the EtOAc fraction from Magnolia obovata fruits, 10 neolignans, named magnolol (1), honokiol (2), isoobovatol (3), isomagnolol (4), obovatol (5), obovatal (6), 9-methoxyobovatol (7), magnobovatol (8), obovaaldehyde (9), and 2-hydroxyobovaaldehyde (10) were isolated and identified. All isolated compounds were evaluated for in vitro cytotoxicity against seven human cancer cell lines.

• 전기학회논문지P
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• 제58권4호
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• pp.451-454
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• 2009

The $\beta-In_2Te_3$ single crystal was grown by vertical Bridgman method. The $\beta-In_2Te_3$ single crystal had a face centered cubic(fcc) structure. The lattice constants were found to be $a\;=\;0.617\;{\AA}$. The direct optical energy gap ($E_g$) was found to be 1.11 ev at 300 K. Raman spectra peak of $\beta-In_2Te_3$ single crystal showed the low $E_{LO}$ mode at $105\;cm^{-1}$. The electrical conduction type was measured by the thermal method and was p-type. The electrical conductivity was found to be $1.8\;{\times}\;10^{-2}\;{\Omega}^{-1}cm^{-1}$ at 300 K. The activation energy was found to be 0.51 eV.