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Urea와 K<sub>2</sub>SO<sub>4</sub> 처리에 의한 복숭아 '미백도'에서 수확 시 과실의 무기성분 농도 및 과피색 변화
문병우,윤익구,문영지,남기웅,이영철,Moon, B.W.,Yoon, I.K.,Moon, Y.J.,Nam, K.W.,Lee, Y.C. 국립한국농수산대학교 교육개발센터 2013 현장농업연구지 = Journal of practical agricultural resear Vol.15 No.1
This study has been conducted to investigate the effect of Urea and K<sub>2</sub>SO<sub>4</sub> treatment at stone hardening stage and 20 days before harvest on soil chemical properties, mineral nutrient concentration and quality of 'Mibaekdo' fruit peach. K concentration after Urea and K<sub>2</sub>SO<sub>4</sub> treatment in soil was increased significantly by Urea 162g+K<sub>2</sub>SO<sub>4</sub> 188g/tree(standard amount) treatment at stone hardening stage, K<sub>2</sub>SO<sub>4</sub> 1.0% tree-spray, Urea 81g+K<sub>2</sub>SO<sub>4</sub> 94g/tree(half amount), Urea 162g+K<sub>2</sub>SO<sub>4</sub> 188g/tree and Urea 324g+K<sub>2</sub>SO<sub>4</sub> 376g/tree(double amount) soil treatment before harvest 20 days compared to control. T-N, K and Ca concentration in leaf was increased significantly by all treatment. but Na concentration in leaf was increased by Urea 0.5% and K<sub>2</sub>SO<sub>4</sub> 1.0% tree-spray treatment before harvest 20 days. T-N concentration in fruit skin was increased significantly by standard amount soil treatment, which decreased by K<sub>2</sub>SO<sub>4</sub> 1.0% tree-spray and half amount soil treatment. T-N, K and Ca concentration in fruit flesh(1~10mm depth flesh from peel) were increased markedly by all treatment excepted Urea 0.5% tree-spray. The leaf weight at harvest was increased markedly by Urea 0.5% tree-spray, standard amount and double amount treatment before harvest 20 days. Fruit weight was increased significantly by standard amount compared to all treatment. Red fruit skin(Hunter a value) progress was effective by K<sub>2</sub>SO<sub>4</sub> tree-spray, half amount and double amount treatment before harvest 20 days. Fruit SSC was increased significantly by Urea 0.5% and K<sub>2</sub>SO<sub>4</sub> tree-spray before harvest 20 days, standard amount treatment at stone hardening stage compared to control.
Y Beam형 모노레일의 가이드 레일 및 클램프의 특성과 안전성에 관한 연구
고형근(Ko H K),김영순(Kim. Y S),남대희(Nam D H),정승연(Jung S Y),천성욱(Cheon S W) 한국철도학회 2010 한국철도학회 학술발표대회논문집 Vol.2010 No.7
모노레일은 그동안 과좌식과 현수식으로 분류 되어 왔으나 세계 최초로 도입한 중앙 안내 방식의 인천 월미은하레일은 신개념의 Y Beam을 가이드 레일로 사용한 새로운 형식의 모노레일이라 할 수 있다. Y Beam 은 안내륜을 통해 모노레일의 수평 하중을 전달하는 역할을 담당하고 있기 때문에 수직 하중을 타이어를 통해 전달 받는 콘크리트 바닥 및 강재 Beam과 함께 모노레일의 주행 안전에 없어서는 안 될 가장 중요한 구조물이다. 본 연구에서는 수평 하중을 감당하고 있을 뿐만 아니라 모노레일의 안정과 안내를 함께 보장 하면서 급전선을 지지하는 역할도 동시에 담당하고 있는 Y Beam과 Y Beam을 고정하는 클램프의 특성과 안전성에 대해 고찰하였다. Monorail has been classified as straddled type and suspended type. However, Inchon Wolmi Eunha rail, a center guide type first ever introduced in the world, uses a new concept Y-Beam as guide rail. Since Y-Beam takes horizontal loads of monorail through guide wheels, it is an essential structure for the safe operation along with concrete surface and steel beam which take vertical loads through main tires. This study presents the characteristic and reliability of Y-Beam and Y-Beam fixture, clamp, which are not only taking horizontal loads but also guarantying both guiding and stability of monorail and holding power supply line.
Aquaporin 2-labeled cells differentiate to intercalated cells in response to potassium depletion
Kim, W. Y.,Nam, S. A.,Choi, A.,Kim, Y. M.,Park, S. H.,Kim, Y. K.,Kim, J. Springer Science + Business Media 2016 Histochemistry and cell biology Vol.145 No.1
<P>The mammalian renal collecting duct consists of principal cells (PCs) and intercalated cells (ICs). Both PCs and ICs are involved in potassium (K+) homeostasis, PCs through their role in K+ secretion and ICs through their ability to facilitate K+ resorption. We previously hypothesized that PCs may differentiate into ICs upon K+ depletion. However, no direct evidence has yet been obtained to conclusively demonstrate that PCs differentiate into ICs in response to K+ depletion. Here, we present direct evidence for the differentiation of PCs into ICs by cell lineage tracing using aquaporin 2 (AQP2)-Cre mice and R26R-EYFP transgenic mice. In control mice, AQP2-EYFP+ cells exhibited mainly a PC phenotype (AQP2-positive/H+-ATPase-negative). Interestingly, some AQP2-EYFP+ cells exhibited an IC phenotype (H+-ATPase-positive/AQP2-negative); these cells accounted for 1.7 %. After K+ depletion, the proportion of AQP2-EYFP+ cells with an IC phenotype was increased to 4.1 %. Furthermore, some AQP2-EYFP+ cells exhibited a 'null cell' phenotype (AQP2-negative/H+-ATPase-negative) after K+ depletion. Collectively, our data demonstrate that AQP2-labeled cells can differentiate into ICs, as well as null cells, in response to K+ depletion. This finding indicates that some of AQP2-labeled cells possess properties of progenitor cells and that they can differentiate into ICs in the adult mouse kidney.</P>
Overview of KSTAR research progress and future plans toward ITER and K-DEMO
Park, H.K.,Choi, M.J.,Hong, S.H.,In, Y.,Jeon, Y.M.,Ko, J.S.,Ko, W.H.,Kwak, J.G.,Kwon, J.M.,Lee, J.,Lee, J.H.,Lee, W.,Nam, Y.B.,Oh, Y.K.,Park, B.H.,Park, J.K.,Park, Y.S.,Wang, S.J.,Yoo, M.,Yoon, S.W.,B IOP 2019 Nuclear fusion Vol.59 No.11
<P>A decade-long operation of the Korean Superconducting Tokamak Advanced Research (KSTAR) has contributed significantly to the operation of superconducting tokamak devices and the advancement of tokamak physics which will be beneficial for the ITER and K-DEMO programs. Even with limited heating capability, various conventional as well as new operating regimes have been explored and have achieved improved performance. As examples, a long pulse high-confinement mode operation with and without an edge-localized mode (ELM) crash was well over 70 and 30 s, respectively. The unique capabilities of KSTAR allowed it to improve the capability of controlling harmful instabilities, and they have been instrumental in uncovering much new physics. The highlights are that the L/H transition threshold power is sensitive to the resonant magnetic perturbation (RMP) and insensitive to non-resonant magnetic perturbation. Co-<I>I</I> <SUB>p</SUB> offset rotation dominated by an electron channel predicted by general neoclassical toroidal viscosity theory was confirmed. Improved heat dispersal in a divertor system using three rows of rotating RMP was demonstrated and predictive control of the ELM-crash with <I>a priori</I> modeling was successfully tested. In magnetohydrodynamic physics, validation of the full reconnection model (i.e. <I>q</I> <SUB>0</SUB> > 1 right after the sawtooth crash) and self-consistent validation of the anisotropic distribution of turbulence amplitude and flow in the presence of the 2/1 island with theoretical models were achieved. The turbulence amplitude induced by RMP was linearly increased with the slow RMP coil current ramp-up time (i.e. the magnetic diffusion time scale). The <I>D</I> <SUB> <I>α</I> </SUB> spikes (i.e. ELM-crash amplitude) was linearly decreased with the turbulence amplitude and not correlated with the perpendicular electron flow. In the turbulence area, a non-diffusive ‘avalanche’ transport event and the role of a quiescent coherent mode in confinement were studied. To accommodate the anticipation of a higher performance of the KSTAR plasmas with the increased heating powers, a new divertor/internal interface with a full active cooling system will be implemented after a full test of the new heating (neutral beam injection II and electron cyclotron heating) and current drive (CD) (Helicon and lower hybrid CD) systems. An upgrade plan for the internal hardware, heating systems and efficient CD system may allow for a long pulse operation of higher performance plasmas at <I>β</I> <SUB>N</SUB> > 3.0 with <I>f</I> <SUB>bs</SUB> ~ 0.5 and <I>T</I> <SUB>i</SUB> > 10 keV.</P>
남기대,윤영균,김용철,정환경 한국유화학회 1998 한국응용과학기술학회지 Vol.15 No.2
Surface active properties of these aqueous Gemini surfactant solutions including surface tension, critical micelle concentration(cmc), foaming power, foam stability, emulsifying power and Krafft point were measured at given conditions. They showed excellent properties, being compared with conventional single-chain surfactants such as sodium dodecyl sulfonate(SDS). Their surface tensions in the aqueous solutions were decreased to 30∼38 mN/m, which is lower than 39 mN/m of SDS, and their cmc values evaluated by surface tension method were 2.8×10exp(-5)∼3.3×10exp(-4) mol/L. Thesds values were also much lower than that of SDS, 9.8×10exp(-3) mol/L. The foaming power and foam stability, especially decyl and dodecyl compounds, were good and the emulsifying power in benzene or soybean oil was also excellent. All of the synthesized Gemini surfactants possessed good water solubility and their Krafft points were all below 0℃. As results, DDED and DDOD, Gemini surfactants which were synthesized are expected to be applied as foamers, emulsifiers and so on.
남지우,김동욱,배미영,박강순,김정현,노상률,최영일,김희종,장동욱,최소명,권영준,Hikita, S.,Yu, C.,Yoshimura, Y.,Kichimi, H. 성균관대학교 기초과학연구소 1998 論文集 Vol.49 No.-
We investigated the properties of BELLE Time Of Flight(TOF) counter using the data taken in Jan 98 beam test at Pi2 beam line at KEK 12 GeV proton synchrotron. Charge distributions from readout PMT were analysed in comparison with dE/dx distributions predicted by GEANT full simulation. Experimental setup of the beam test is described, then procedures of data analysis, Monte Carlo simulation and analysis results are also described.
남윤성,김현주,이숙환,곽인평,윤태기,차광열,Nam, Y.S.,Kim, H.J.,Lee, S.H.,Kwak, I.P.,Yoon, T.K.,Cha, K.Y. 대한생식의학회 1999 Clinical and Experimental Reproductive Medicine Vol.26 No.2
Different Y mutation in Yq11 occurring de novo in sterile males were first described 19 years ago. Since the phenotype of the patients was always associated with azoospermia or severe oligospermia, it was postulated that these mutations interrupt a Y spermatogenesis locus in the euchromatic Y region (Yq11) called azoospermia factor (AZF). Recently, it became possible to map AZF mutations to different subregions in Yq11by molecular deletion mapping. This indicated that azoospermia is possibly caused by more than one Y gene in Yq11 and the Yq11 chromatin structure. The frequency of AZF mutations in idiopathic sterile males $(5{\sim}20%)$ may indicate a need for a general screening programme for its analysis in infertility clinic. We have experienced a case of deletion distal to Yq11 region in azoospermic patient. So we report this case with a brief review of literatures.