• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2011년도 학술발표회
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• pp.263-263
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• 2011

본 연구에서는 전 세계적으로 급속히 보급되고 있는 비담수재배를 기초로 하는 SRI(System of Rice Intensification) 벼 재배방법을 우리나라의 논 농업에 최초로 적용하여 관개기간동안 유출되는 오염부하량과 기존의 담수재배인 관행 시험포에서 유출되는 오염부하량을 산정하여 저감효과를 비교 평가하였다. 실험처리는 대조구인 담수재배(관행) 1처리(재식거리 $30{\times}15cm$)와 SRI 재배($30{\times}30cm$, $40{\times}40cm$, $50{\times}50cm$) 3처리로 2반복으로 하여 가로 5 m, 세로 15 m 크기의 논 시험포를 총 8개 조성하였다. 그리고 관개기간동안(2010년 5월부터 9월) 관개량, 강우량 그리고 강우 유출량 측정하고 수질시료를 채취하여 오염부하를 산정하였다. 관행재배의 시비와 제초 등의 포장관리는 표준재배법에 준하여 진행하였으며, SRI 재배의 경우 물관리를 제외하고 관행재배와 동일하게 영농관리를 수행하였다. 연구기간동안 총 63회의 강우가 발생하였으며, 이중 20 mm 이상의 강우는 17회로, 일 강우량은 20.5 mm에서 195 mm의 범위를 보였다. 강우 모니터링 결과, 20 mm 이상의 강우에서 유출이 발생하였다. SRI 시험포에서의 유출계수는 0.74~0.83 범위로 관행시험포의 유출계수인 0.83~0.92 범위보다 낮은 값을 보였으며, 시험포에 따라 차이는 있으나 5~13%의 유출수 저감효과를 나타내었다. SRI시험포의 SS, $COD_{Cr}$, $COD_{Mn}$, BOD, TN, TP의 총 오염부하량은 각각 874 kg/ha, 199.5 kg/ha, 47 kg/ha, 13 kg/ha, 36.9 kg/ha, 2.92 kg/ha 로서 관행 시험포의 오염부하량에 비해 15.8~44.1 %의 오염물질 저감 효과를 보였다. 특히 SRI 벼재배기술 적용 시 SS 및 BOD와 같은 유기물의 오염부하량 저감효과가 큰 것으로 나타났다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.1100-1105
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• 2010

The high speed line and conventional line are a single-phase AC feeding system; and power supplies of different phases meet at SS(SubStation)s or SP(Sectioning Post)s. These sections should be negotiated with the main circuit breaker in the traction vehicle switched off, whereby the length of the neutral zone prevents the pantographs shunting adjacent overhead line section. In order for electric railway vehicles to make power running there, there must be a power supply changeover section (approx. for 1km), where a changeover switch changes a power supply to the other power supply of a train running direction sequentially. For a thorough changeover switching control, the precise train position detection is necessarily required. In this paper, to realize the ground-based train position detection method, configuration scheme of train position detection equipment is suggested by using track circuit and axle counter.

• 한국물환경학회지
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• 제22권2호
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• pp.238-243
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• 2006

In order to improve the water quality of stream water, the facilities equipped with rope media filter have been examined as a part of national projects. This work may provide design and operating parameters from 2 years monitoring for 2 streams. Depending on the characteristics of streams, the flow rate into the facilities were shown different, where K stream was almost the same and D stream was less than 25% of design flow rate. Although the clogging of filter media was not observed during the operation, the removal of accumulated sludges was required for the stable operation. The removal efficiencies of BOD, SS, T-N and T-P for D stream were 60.5%, 80.1%, 25.2% and 36.2%, respectively. The most important factor for the construction of stream water purification facilities was recommended for the selection of proper sites.

• 한국물환경학회지
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• 제22권3호
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• pp.456-461
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• 2006

The facility of constructed wet land combined with filter media was examined in order to improve the water quality of a polluted stream, which has been performed as a part of national projects. Throughout 2 years of operation for a stream, it can provide the design and operating parameters for the purpose of future construction. The influent flow rate was about 50% against the design capacity. The removal efficiencies of BOD, $COD_{Mn}$, SS, T-N and T-P were 62.9%, 47.1%, 74.8%, 22.4% and 33.5%, respectively. In order to keep this facility stable, the removal of surface filter media and supplement should be periodically conducted. In addition, the proper selection of sites is recommended not to be flooded.

• Journal of Yeungnam Medical Science
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• 제37권2호
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• pp.73-78
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• 2020

Cancer incidence has been increasing steadily and is the leading cause of mortality worldwide. Gastric cancer is still most common malignancy in Korea. Cancer initiation and progression are multistep processes involving various growth factors and their ligands. Among these growth factors, we have studied hepatocyte growth factor (HGF), which is associated with cell proliferation and invasion, leading to cancer and metastasis, especially in gastric cancer. We explored the intercellular communication between HGF and other surface membrane receptors in gastric cancer cell lines. Using complimentary deoxyribonucleic acid microarray technology, we found new genes associated with HGF in the stomach cancer cell lines, NUGC-3 and MKN-28, and identified their function within the HGF pathway. The HGF/N-methyl-N'-nitroso-guanidine human osteosarcoma transforming gene (c-MET) axis interacts with several molecules including E-cadherin, urokinase plasminogen activator, KiSS-1, Jun B, and lipocalin-2. This pathway may affect cell invasion and metastasis or cell apoptosis and is therefore associated with tumorigenesis and metastasis in gastric cancer.

• 한국발생생물학회지:발생과생식
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• 제21권3호
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• pp.307-315
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• 2017

Surgical castration (also known as orchidectomy, ORX) has been frequently performed to avoid uncontrolled breeding. However, it has some serious disadvantages. Several laboratories have developed chemical castration methods, using bilateral intratesticular injection (BITI) of simple chemical solutions. The present study was undertaken to compare the effects of ORX and of hypertonic saline BITI on the androgen-sensitive tissues such as pituitary and hypothalamus. Serum testosterone (T) levels of ORX animals and hypertonic saline BITI animals (SAL) after 4 weeks of the manipulations exhibited significantly drops as compared with the levels of intact animals ( $Intact:ORX:SAL=7.74{\pm}1.31:1.34{\pm}0.19:1.28{\pm}0.18ng/ml$, p<0.001). Both ORX and BITI method induced similar stimulatory effects on the pituitary gonadotropin subunits and hypothalamic KiSS-1 gene expressions. In contrast, the effects of ORX and hypertonic saline BITI on hypothalamic GnRH gene expression were different from these gene expressions, shown an inverse relationship between the two groups ($Intact:ORX:SAL=1:0.45{\pm}0.06:1:2.07{\pm}0.41:1.51{\pm}0.37AU$; ORX, p<0.001; SAL, p<0.05). In conclusion, we provided evidence that hypertonic saline BITI method has equivalent efficacy of T depletion to surgical castration in rats. The present study suggests the hypertonic saline BITI could be a promising substitute to conventional surgical castration.

• 한국초전도ㆍ저온공학회논문지
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• 제6권4호
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• pp.1-4
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• 2004

Three group samples with difference thickness of $CeO_2$ capping layer deposited by PLD were studied. Among them, one group $CeO_2$ films were deposited on stainless steel tape coated with IBAD- YSZ and $CeO_2$ buffer layer ($CeO_2$/IBAD-YSZ/SS); other two groups of $CeO_2 YSZ Y_2O_3$multi-layer were deposited on NiW substrates for fabrication of YBCO coated conductor through RABiTS approach. The pulsed laser deposition (PLD) and DC magnetron sputtering were employed to deposit these buffer layers. On the top of buffer layer, YBCO film was deposited by PLD. The effect of thickness of $CeO_2$ film on the texture of $CeO_2$ film and critical current density ($J_c$) of YBCO film were analyzed. For the case $CeO_2$ on $CeO_2$/IBAD-YSZ/SS, there was a self-epitaxy effect with the increase of $CeO_2$ film. For $YSZ/Y_2O_3$ NiW which was deposited by PLD or DC magnetron sputtering, there is not self-epitaxy effect. However, the capping layer of $CeO_2$ film deposited by PLD improved the quality of buffer layer for $YSZ/Y_2O_3$ which was deposited by DC magnetron sputtering, therefore increased the $J_c$ of YBCO film.

• Journal of Microbiology and Biotechnology
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• 제23권1호
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• pp.22-28
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• 2013

Xo2276 is a putative transcription activator-like effector (TALE) in Xanthomonas oryzae pv. oryzae (Xoo). Xo2276 was expressed with a TAP-tag at the C-terminus in Xoo cells to enable quantitative analysis of protein expression and secretion. Nearly all TAP-tagged Xo2276 existed in an insoluble form; addition of rice leaf extracts from a Xoosusceptible rice cultivar, Milyang23, significantly stimulated secretion of TAP-tagged Xo2276 into the medium. In a T3SS-defective Xoo mutant strain, secretion of TAPtagged Xo2276 was blocked. Xo2276 is a Xoo ortholog of Xanthomonas campestris pv. vesicatoria (Xcv) AvrBs3 and contains a conserved DNA-binding domain (DBD), which includes 19.5 tandem repeats of 34 amino acids. Xo2276- DBD was expressed in E. coli and purified. Direct in vitro recognition of Xo2276-DBD on a putative target DNA sequence was confirmed using an electrophoretic mobility shift assay. This is the first study measuring the homologous expression and secretion of Xo2276 in vitro using rice leaf extract and its direct in vitro binding to the specific target DNA sequence.

• 유기물자원화
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• 제19권3호
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• pp.29-34
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• 2011

본 연구에서는 맥주 생산 공정에서 발생되는 고농도 유기성 폐수를 처리하는데 혐기성 필터를 사용하였다. 전체 운전 기간 동안, 메탄 생산과 맥주 폐액 처리가 효과적으로 이루어졌다. BOD, CODcr, SS, TN, TP의 평균 처리효율은 각각 61.4 %, 60.9 %, 31.4 % 70.7 %, 70.0 %를 나타내었다. 그리고, 전체가스 중 메탄 함량과 메탄 생산량은 각각 68. 8 %와 $0.08{\sim}0.77m^3CH_4/kgCOD$가 됨을 알 수 있었다. 이번 연구를 통하여 개발된 기술은 맥주 폐액 처리와 메탄 생산성 향상에 효과적인 방법으로서 실질적인 혐기 소화 처리로 사용될 수 있을 것이다.

• 한국축산시설환경학회지
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• 제17권1호
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• pp.11-22
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• 2011

젖소는 성장단계 및 생산단계별 사료 급여 및 사양 관리 방법을 다르게 하여 사육되고 있어, 이에 따라 사료섭취량, 음수량 및 분뇨 배설량과 특성이 달라질 수 있는 것으로 인식되어 왔다. 그러나 이에 대한 정확한 자료가 조사되고 제시되지 않아 축산분뇨 정책을 수립하고 낙농농가가 적절하게 분뇨처리를 실시하도록 유도하는데 어려움이 있어왔다. 본 연구에서는 이러한 문제점을 해결하기 위하여 성장 단계와 생산 단계별로 젖소를 공시하여 사료섭취량, 음수량 및 분뇨 배설량과 분뇨 특성의 변화를 조사하였다. 시험 결과를 요약하면 다음과 같다. 사료와 물의 최대 섭취조건에서의 젖소의 평균 분뇨 발생량은 41.5 kg/두/일(분 24.9, 뇨 16.4 kg)이고 분뇨의 평균 수분함량은 각각 85.0% 과 93.9% 이였다. 젖소 분뇨의 $BOD_5$, COD, SS의 오염 물질농도는 각각 분에서 15,444, 53,159, 40,528 mg/L이었고, 뇨에서 8,454, 1,116, 962 mg/L이었다. 그리고 분과 뇨를 통한 수질오염물질인 $BOD_5$, $COD_{Mn}$, SS의 일일부하량은 523, 1,416 및 1,025g 인 것으로 조사되었다. 또한, 비료성분인 N, P, K의 함량은 분 중에는 0.33, 0.49 및 0.20% 으로 나타났고, 뇨 중에는 1.02, 0.27, 1.03으로 나타났다. 광물질인 Ca, Na, Mg 함량은 1.56, 0.24, 0.69% 이었으며, 중금속물질인 Zn, Cu, Cr, Pb, As의 분중의 함량은 69.23, 19.14, 2.89, 7.73, 2.94 ppm 수준으로 조사되었다. 따라서 농가에서 젖소의 성장단계별 배출되는 분뇨를 파악함으로써 영양과 오염물질의 최적 균형을 유지할 수 있을 것으로 판단된다.