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洪水量 추정에 관한 硏究 (Ⅰ) : 臨河(乙)地域을 中心으로 with reference to the Im-Ha region
金熙鍾,全裕燦 동아대학교 환경문제연구소 1986 硏究報告 Vol.9 No.1
The objective of this paper is a study on the presumption of the flood discharge in the Nak-Dong rivers. In this study, the flood discharge was compared observed values with calculated values of Nakayasu's method, storage function method using the computer, and its study will be contributed much to the flood forecast at the Im-Ha region in the Nak-Dong revers
金熙鍾,柳又秀,金佳鉉,申東守,韓健模,全裕燦 東亞大學校 大學院 1984 大學院論文集 Vol.9 No.-
This paper is a study on relation between run-off ratio and antecedent discharge, run-off ratio and antecedent discharge per unit area, antecedent discharge and antecedent precipitation, by the data from the five major river basins in Korea and the small river basins in Pusan. The Nak-Dong rivers(An-Dong upper stream) f=0.4780+0.0124 ln qA r=0.99 qA=0.3368e0.1101R r=0.99 f=0.5793+0.0146 ln(qA/A) r=0.99 The Nak-Dong rivers except Ga-song station f=0.2017-0.0840 ln qA r=0.75 f=0.7012+0.0750 ln(aA/A) r=0.71 The Han rivers f=-0.0035+01267 on qA r=0.75 f=1.1311+0.1263 ln(qA/A) r=0.71 L=302.9064-43.8490 ln qA r=0.84 The Geun rivers(Mu-sin Cheon) f=0.295+0.1823 ln qA r=0.93 f=0.8417+0.1823 ln(qA/A) r=0.93 L=40.0456+62.0346 ln qA r=0.94 The Yeong-san rivers f=0.3766+0.0598 ln qA r=0.79 f=0.8084+0.0599 ln(qA/A) r=0.79 The Seom-jin rivers f=-1.3875+0.6505 ln qA r=0.92 f=2.1633+0.3465 ln(qA/A) r=0.76 Small river basin in Pusan f=0.3635+0.1120 ln qA r=0.87
金熙鐘,全裕燦,金一龍 東亞大學校 1986 東亞論叢 Vol.23 No.1
Water discharge recession curves of runoff were composed for 6 basins from long term discharge data which has been examined on their reliability. The attenuation constant of a master recession curve between base water-discharge and initial storm loss was compared with a simple index made from geographic gradient and geologic matrix of each basin. The two values seem to have correlation, provided that the river density is taken into account. It strongly suggests that the quantative relationship between master recession curve and geography and geology of the basin would possibly be existent. The results obtained are summarized as follows; 1. a relationship between Initial storm Loss and Base Water-Dischre; r=0.74, 0.83, 0.77, 0.99, 0.98, 0.89, t=95%over 2. a relationship between constant of Initial Storm Loss (c) and Recession Coefficient; r=0.82 t=95%over 3. a relationship between River Density and Recession Coefficient; r=0.83, t=95%over. 4. a relationship between Average Gradient of the River Basin and Recession Coefficient; r=0.83, t=95%over 5. a relationship between Shape Factor and Recession Coefficient; r=0.823, t=95%over.
유준희(Jun Hi Yoo),정구흥(Gu Hung Jung) 한국식물학회 1994 Journal of Plant Biology Vol.37 No.1
DNA uptake in dry embryos of rice by DNA imbibition was detected by monitoring the expression of chimeric vectors. The selective markers of expression vectors used were β-glucuronidase (GUS) and hygromycin phosphotransferase (HPT) genes under the control of CaMV 35S promoter. Frequency of transient expression of the foreign gene was generally 30-50% varying according to the types of vectors and rice cultivars. Dot blot analysis and DNA sequence analysis of inverse polymerase chain reaction products showed that selected rice in hygromycin B (HmB) medium had HPT gene and CaMV35S promoter DNA sequence in genomic DNA of rice. To investigate what ratio of rice having two marker genes simultaneously as rice embryos imbibed the vector DNA having two HPT and GUS gene, transformants selected in HmB medium were subjected to PCR for GUS gene. It was shown that about 90 percentage of surviving ones in HmB medium had GUS gene.
Yoo, Junsang,Lee, Euiyeon,Kim, Hee Young,Youn, Dong-ho,Jung, Junghyun,Kim, Hongwon,Chang, Yujung,Lee, Wonwoong,Shin, Jaein,Baek, Soonbong,Jang, Wonhee,Jun, Won,Kim, Soochan,Hong, Jongki,Park, Hi-Joon Nature Publishing Group, a division of Macmillan P 2017 Nature nanotechnology Vol.12 No.10
Electromagnetic fields (EMF) are physical energy fields generated by electrically charged objects, and specific ranges of EMF can influence numerous biological processes, which include the control of cell fate and plasticity. In this study, we show that electromagnetized gold nanoparticles (AuNPs) in the presence of specific EMF conditions facilitate an efficient direct lineage reprogramming to induced dopamine neurons in vitro and in vivo. Remarkably, electromagnetic stimulation leads to a specific activation of the histone acetyltransferase Brd2, which results in histone H3K27 acetylation and a robust activation of neuron-specific genes. In vivo dopaminergic neuron reprogramming by EMF stimulation of AuNPs efficiently and non-invasively alleviated symptoms in mouse Parkinson's disease models. This study provides a proof of principle for EMF-based in vivo lineage conversion as a potentially viable and safe therapeutic strategy for the treatment of neurodegenerative disorders.
유동철(Yoo, Dong-Cheol),김준희(Kim, Jun-Hi),윤두영(Yun, Doo-Young),이응직(Lee, Eung-Jik) 한국태양에너지학회 2012 한국태양에너지학회 학술대회논문집 Vol.2012 No.11
With rapid modernization and industrialization, many urban areas are becoming overcrowded at a rapid pace and such urban ecological problems as heat island effect are becoming serious due to the reduced green zones resulted from the indiscriminate development. To solve this problem, ecological park, constructed wetlands, and greening on the elevation, balcony, and roof of a building that have the structure and function very close to the state of nature are currently being promoted at the urban or regional level. Especially green roof will be able to not only provide the center of a city with a significant portion of green area but also help to relive heat island effect and improve micro climate by preventing concrete of a building from absorbing heat. According to a recent study, the temperature of green roof in the summer season shows a lower temperature than the outdoor temperature, but inversely the concrete surface shows a higher temperature. Accordingly, this study measured the surface temperature of buildings with green roof in Daejeon area in order to determine how the green roof system would have an impact on the distribution of surface temperature and did a comparative analysis of the distribution of the surface temperature of green roof vs non-green roof based on these theoretical considerations. As a result, it was found that the surface temperature of green roof was lower by 4∼7℃ than that of non-green roof. This is expected to contribute to the mitigation of urban heat island effects.
Ni 기지 초내열합금의 고온산화 저항성에 미치는 Ti의 영향
박시준 ( Si-jun Park ),서성문 ( Seong-moon Seo ),유영수 ( Young-soo Yoo ),정희원 ( Hi-won Jeong ),장희진 ( Hee Jin Jang ) 한국부식방식학회(구 한국부식학회) 2016 Corrosion Science and Technology Vol.15 No.3
The effects of Ti on the high temperature oxidation of Ni-based superalloys were investigated by cyclic oxidation at 850 °C and 1000 °C. The oxide scale formed at 850 °C consists of Cr2O3, Al2O3, and NiCr2O4 layers, while a continuous Al2O3 layer was formed at 1000 °C. The oxidation rate of the alloy with higher Ti content was higher than the alloy with less Ti content at 850 °C, possibly due to the increase in the metal vacancy concentration in the Cr2O3 layer involved by incorporation of Ti4+. However, Ti improved the oxidation resistance of the superalloy at 1000 °C by reducing oxygen vacancy concentration in Al2O3 layer.
Effects of Al and Ta on the high temperature oxidation of Ni-based superalloys
Park, Si-Jun,Seo, Seong-Moon,Yoo, Young-Soo,Jeong, Hi-Won,Jang, HeeJin Elsevier 2015 Corrosion science Vol.90 No.-
<P><B>Abstract</B></P> <P>The effects of Al and Ta on the high temperature oxidation of Ni–8Cr–9.5Co–2.5Mo–6W–(4–5)Al–2Ti–(3–6)Ta–0.1C–0.01B (wt.%) superalloys were examined at 850°C and 1000°C by cyclic oxidation tests. The oxidation resistance of the superalloys was improved with an increase in the Al content in the alloy at both temperatures, although the degree of this influence was dependent on Ta concentration at 850°C. Ta was found to be detrimental to formation of a continuous Al<SUB>2</SUB>O<SUB>3</SUB> layer at 850°C, but it reduced oxidation rate at 1000°C or when its concentration is over 5wt.% at 850°C.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The effects of Al and Ta on the oxidation of Ni-based superalloy were examined. </LI> <LI> The beneficial effects of Al depend on Ta concentration. </LI> <LI> Ta improves or degrades oxidation resistance depending on the alloy composition. </LI> <LI> Ta inhibits formation of continuous Al<SUB>2</SUB>O<SUB>3</SUB> layer. </LI> <LI> Ta reduces the mass gain by oxidation under low Al concentration. </LI> </UL> </P>