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유동층 연소로 안전조업을 위한 진동 공급기내의 고체입자 혼합특성에 관한 연구
김미영,조병렬,박상찬,이동규,김의식 한국산업안전학회 1998 한국안전학회지 Vol.13 No.3
This work has been carried out to study the mixing characteristics of solid in vibrating feeder for stable operations of fluidized bed combustion. The system consisted of two particles such that fine particles were located on the top of the coarse particles before vibratory mixing had started. Effect of particle size, particle densities, vibration amplitude and vibration frequency were experimentally obtained. Also, a diffusion model was applied in interpreting the experimental results. From these results, the following empirical equation for the diffusivity was obtained. 수식
Han S. Uhm,Kyung H. Lee,Soon C. Cho,Sung Y. Jo,Chan U. Bang,Dong K. Lee 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.53 No.2
Surface treatments of Y2O3:Eu phosphors for improving the hydrophobic property were carried out using plasmas generated from a O-(Si(CH3)3)2 (HMDSO) in a low-pressure environment. The super-hydrophobic properties of the treated Y2O3:Eu phosphors were investigated. The samples treated by using the HMDSO/toluene glow plasma were analyzed by FTIR and OES and analyzed in terms of their contact angles (CAs). The effects of the HMDSO/toluene plasma treatments on the Y2O3:Eu phosphors were investigated in terms of the total surface free energy by using probe liquids to measure their contact angles (CAs). The total surface free energy of the Y2O3:Eu phosphors before and after a surface treatment with the HMDSO/toluene plasma, as estimated via the Owens-Wendt equation, was found to decrease from 82.2 mJ/m2 to 0.021 mJ/m2. This represents a significant improvement of the hydrophobicity of the Y2O3:Eu phosphors after the plasma treatment.
Simulations of background sources in AMoRE-I experiment
Luqman, A.,Ha, D.H.,Lee, J.J.,Jeon, E.J.,Jo, H.S.,Kim, H.J.,Kim, Y.D.,Kim, Y.H.,Kobychev, V.V.,Lee, H.S.,Park, H.K.,Siyeon, K.,So, J.H.,Tretyak, V.I.,Yoon, Y.S. Elsevier 2017 Nuclear instruments & methods in physics research. Vol.855 No.-
<P><B>Abstract</B></P> <P>The first phase of the Advanced Mo-based Rare process Experiment (AMoRE-I), an experimental search for neutrinoless double beta decay ( 0 ν β β ) of <SUP>100</SUP>Mo in calcium molybdate ( <SUP> 40 </SUP> Ca<SUP>100</SUP>MoO<SUB>4</SUB>) crystal using cryogenic detection techniques, is in preparation at the YangYang underground laboratory (Y2L) in Korea. A GEANT4 based Monte Carlo simulation was performed for the first-phase AMoRE detector and shield configuration. Background sources such as <SUP>238</SUP>U, <SUP>232</SUP>Th, <SUP>235</SUP>U, and <SUP>210</SUP>Pb from inside the crystals, surrounding materials, outer shielding walls of the Y2L cavity were simulated. The estimated background rate in the region of interest was estimated to be < 1.5 × <SUP> 10 − 3 </SUP> counts/keV/kg/yr (ckky). The effects of random coincidences between backgrounds and two-neutrino double beta decays of <SUP>100</SUP>Mo as a potential background source were estimated to be < 2.3 × <SUP> 10 − 4 </SUP> ckky.</P>
Artur N. Carreiro,João A. R. A. Diniz,Joyce G. Souza,Débora V. F. Araújo,Rômulo F. F. Dias,Liliane M. S. Azerêdo,Ediane F. Rocha,Ana Y. F. La Salles,Carlos E. Peña-Alfaro,Maria A. M. Carvalho,Maria J. 대한수의학회 2018 Journal of Veterinary Science Vol.19 No.3
The objective of the present study was to monitor and characterize morphological alterations in ovaries of agouti (Dasyprocta prymnolopha), reared in captivity, by using abdominal ultrasonography. All animals underwent daily vaginal cytological examination to identify the current cycle phase. For each phase of the estrous cycle, ultrasound examinations were carried out to identify and describe the morphology of both ovaries. Topographic parameters in an ultrasound window were established to locate the ovaries. The agouti estrous cycle lasted an average of 29.94 ± 6.77 days. During vaginal cytology examinations, all cell types were identified, and each phase of the estrous cycle was established by cell counts. No significant alterations were observed in the assessed ovarian morphometry measurements. In 75% of the animals examined, ovarian follicle presence was observed in the proestrus phase.
Jo, Y J,Kim, Y H,Jo, Y H,Seong, J G,Chang, S Y,Van Tyne, C J,Lee, W H American Scientific Publishers 2014 Journal of Nanoscience and Nanotechnology Vol.14 No.11
<P>A single pulse of 1.5 kJ/0.7 g of atomized spherical Ti powder from 300 μF capacitor was applied to produce the porous-surfaced Ti implant compact by electro-discharge-sintering (EDS). A solid core surrounded by porous layer was self-consolidated by a discharge in the middle of the compact in 122 μsec. Average pore size, porosity, and compressive yield strength of EDS Ti compact were estimated to be about 68.2 μm, 25.5%, and 266.4 MPa, respectively. Coatings with hydroxyapatite (HAp) on the Ti compact were conducted by electrostatic-spray-deposition (ESD) method. As-deposited HAp coating was in the form of porous structure and consisted of HAp particles which were uniformly distributed on the Ti porous structure. By heat-treatment at 700 degrees C, HAp particles were agglomerated each other and melted to form a highly smooth and homogeneous HAp thin film consisted of equiaxed nano-scaled grains. Porous-surfaced Ti implant compacts coated with highly crystalline apatite phase were successfully obtained by using the EDS and ESD techniques.</P>
Diaminodiphenyl sulfone-induced parkin ameliorates age-dependent dopaminergic neuronal loss
Lee, Y.I.,Kang, H.,Ha, Y.W.,Chang, K.Y.,Cho, S.C.,Song, S.O.,Kim, H.,Jo, A.,Khang, R.,Choi, J.Y.,Lee, Y.,Park, S.C.,Shin, J.H. PERGAMON PRESS LTD 2016 NEUROBIOLOGY OF AGING Vol.41 No.-
During normal aging, the number of dopaminergic (DA) neurons in the substantia nigra progressively diminishes, although massive DA neuronal loss is a hallmark sign of Parkinson's disease. Unfortunately, there is little known about the molecular events involved in age-related DA neuronal loss. In this study, we found that (1) the level of parkin was decreased in the cerebellum, brain stem, substantia nigra, and striatum of aged mice, (2) diaminodiphenyl sulfone (DDS) restored the level of parkin, (3) DDS prevented age-dependent DA neuronal loss, and (4) DDS protected SH-SY5Y cells from 1-methyl-4-phenylpyridinium and hydrogen peroxide. Furthermore, pretreatment and/or post-treatment of DDS in a 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-induced Parkinson's disease model attenuated DA neuronal loss and restored motor behavior. DDS transcriptionally activated parkin via protein kinase RNA-like endoplasmic reticulum kinase-activating transcription factor 4 signaling and DDS not only failed to induce parkin expression but also failed to rescue SH-SY5Y cells from 1-methyl-4-phenylpyridinium in the absence of ATF4. Herein, we demonstrated for the first time that DDS increased parkin level and served as a neuroprotective agent for age-dependent DA neuronal loss. Thus, DDS may be a potential therapeutic agent for age-related neurodegeneration.
Pulse-shape Discrimination of Fast Neutron Background using Convolutional Neural Network for NEOS II
Jeong Y.,Han B. Y.,Jeon E. J.,Jo H. S.,Kim D. K.,Kim J. Y.,Kim J. G.,Kim Y. D.,Ko Y. J.,Lee H. M.,Lee M. H.,Lee J.,Moon C. S.,Oh Y. M.,Park H. K.,Park K. S.,Seo S. H.,Siyeon K.,Sun G. M.,Yoon Y. S.,Yu 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.12
Pulse-shape discrimination plays a key role in improving the signal-to-background ratio in NEOS analysis by removing fast neutrons. Identifying particles by looking at the tail of the waveform has been an effective and plausible approach for pulse-shape discrimination, but has the limitation in sorting low energy particles. As a good alternative, the convolutional neural network can scan the entire waveform as they are to recognize the characteristics of the pulse and perform shape classification of NEOS data. This network provides a powerful identification tool for all energy ranges and helps to search unprecedented phenomena of low-energy, a few MeV or less, neutrinos.
Kang, Y.-K.,Ryu, M.-H.,Park, S.H.,Kim, J.G.,Kim, J.W.,Cho, S.-H.,Park, Y.-I.,Park, S.R.,Rha, S.Y.,Kang, M.J.,Cho, J.Y.,Kang, S.Y.,Roh, S.Y.,Ryoo, B.-Y.,Nam, B.-H.,Jo, Y.-W.,Yoon, K.-E.,Oh, S.C. Elsevier 2018 ANNALS OF ONCOLOGY Vol.29 No.5
<P>Conclusions: DHP107 as a second-line treatment of AGC was non-inferior to paclitaxel for PFS; other efficacy and safety parameters were comparable. DHP107 is the first oral paclitaxel with proven efficacy/safety for the treatment of AGC.</P>
Kim, T.H.,Jo, Y.H.,Gyawali, G.,Adhikari, R.,Sekino, T.,Lee, S.W. North-Holland 2013 Materials letters Vol.101 No.-
The TiO<SUB>2-x</SUB>N<SUB>y</SUB>/Ag-PbMoO<SUB>4</SUB> nanocomposites were prepared by sonochemical method. The as-prepared powders were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), and diffuse reflectance UV-vis spectroscopy (UV-vis-DRS). The results revealed that the band gap energy absorption edge of TiO<SUB>2-x</SUB>N<SUB>y</SUB>/Ag-PbMoO<SUB>4</SUB> nanocomposites red shifted as compared to TiO<SUB>2-x</SUB>N<SUB>y</SUB> and Ag-PbMoO<SUB>4</SUB>. According to FE-SEM studies, Ag-PbMoO<SUB>4</SUB> gets to be decorated with evenly distributed TiO<SUB>2-x</SUB>N<SUB>y</SUB> nanoparticles. The photocatalytic activity of TiO<SUB>2-x</SUB>N<SUB>y</SUB>/Ag-PbMoO<SUB>4</SUB> nanocomposites for photoinactivation of green tide (Tetraselmis suecica) under simulated solar light was enhanced as compared with TiO<SUB>2-x</SUB>N<SUB>y</SUB> and Ag-PbMoO<SUB>4</SUB>. The TiO<SUB>2-x</SUB>N<SUB>y</SUB>/Ag-PbMoO<SUB>4</SUB> nanocomposites showed the highest percentage (100%) of removing of Tetraselmis suecica after 25min. The TiO<SUB>2-x</SUB>N<SUB>y</SUB>/Ag-PbMoO<SUB>4</SUB> nanocomposite may facilitate the charge transfer process more efficiently by inhibiting electron-hole recombination, which enhanced the photocatalytic activity.
Activity analysis of LTR12C as an effective regulatory element of the RAE1 gene
Jung, Y.D.,Lee, H.E.,Jo, A.,Hiroo, I.,Cha, H.J.,Kim, H.S. Elsevier/North-Holland 2017 Gene Vol.634 No.-
Ribonucleic acid export 1 (RAE1) plays an important role in the export of mature mRNAs from the nucleus to the cytoplasm. Long terminal repeats (LTRs) became integrated into the human genome during primate evolution. One such repeat element, LTR12C, lies within a predicted regulatory region located upstream of the RAE1 gene. We examined the transcriptional activity of LTR12C by using the luciferase assay, and showed that the tandem repeat region (TRR) located within LTR12C was required for its regulatory function. A bioinformatics analysis revealed that the LTR12C element had multiple transcription factor binding sites specific for nuclear transcription factor Y (NF-Y), and the promoter activity of LTR12C was significantly decreased after NF-Y knockdown. Additionally, we discovered novel data indicating that LTR12C was initially inserted into the gorilla genome. Taken together, our results reveal that the TRR of LTR12C has powerful regulatory activity due to its NF-Y binding sites, and the integration of the LTR12C element into the primate genome during evolution may have affected RAE1 transcription.