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A GoldSim Model for the Radionuclide Migration of LILW Disposal Site in Gyeongju
Kyutae Park,Hyejin Kim,Sungryul Kim,Jungmin Oh,Baro Lee,Jiung Kim,Hyunyoung Shin,Wookjae Yoo,Sangsoo Han 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.1
The chelating agent and cellulose generated during the operating and decommissioning of a NPP’s form organic complexing compounds. That is accelerate the migration of radionuclide and have a bad influence of LILW disposal site. In this study, the GoldSim (RT module) program was used for the effects of radionuclide migration by organic complex compounds as described above. A scenario was derived for evaluation, and a conceptual design (Concept Art) of the GoldSim model was performed. 1) Derivation of the scenario. For the scenario, we selected a groundwater flow scenario in which groundwater flows in and radionuclides flow out after a lapse of time after the operation of the LILW disposal site in Gyeongju is closed. The inflowing groundwater comes into contact with radioactive waste and the radionuclides dissolve. The dissolved nuclides move past the drum and out of the disposal vessel due to the advection phenomenon. Radionuclides spilled from the disposal vessel pass through the silo internal filler (crushed stone) and reach the engineering barrier concrete. Radionuclides from degraded concrete are scenarios that move along the flow of groundwater to the near and far. 2) Radionuclide migration concept design. The radionuclide movement section was largely designed with Inner (Inside the silo), Near and Far. (A) Inner (Inside the silo) This section is where radionuclides move from the radiation source to the engineering barrier (silo). The detailed migration path was designed to allow radioactive nuclides to flow out and move to waste drums, solidified matrix of indrum, disposal vessel fillers, disposal vessels, silo fillers (crushed stones), and engineered barriers (concrete). The LILW disposal site in Gyeongju has a total of 6 silos. Each of the 6 silos was modeled and designed in consideration of the structural information and positional impact. (B) Near & Far. In generally design, the near is form source term to engineered barrier and far is beyond the engineered barrier. In this study, the near and far designed by radionuclide in the section from the beyond the engineering barrier (silo) to the sea through the groundwater flow through the natural rock. Especially in the case of near, the design was made by applying the position of the natural rock sampling drill hole.
Spin-orbit torque properties of W-V alloy based magnetic heterostructures
Jeong Kyu Lee,Gyu Won Kim,Taehyun Kim,Min Hyeok Lee,In Ho Cha,Jiung Cho,Young Keun Kim 한국자기학회 2021 한국자기학회 학술연구발표회 논문개요집 Vol.31 No.2
β-W is considered the most promising transition metal due to its outstanding charge-to-spin conversion efficiency. Despite this exceptional property, alloys based on β-W as a spin current generating layer have been rarely studied due to their lack of phase stability. This study examines various properties of W-V alloy layers in W100-xVx (5)/CoFeB (2.5)/MgO (1)/Ta (2) magnetic heterostructures with different W-V compositions. Samples were sputtered onto thermally oxidized Si wafers under a base pressure below 5 × 10<SUP>-9</SUP> Torr. Diverse W100-xVx compositions were fabricated by changing sputtering power densities of W and V targets during co-deposition. X-ray diffraction verified the existence of β-W up to a V content of 20 at%. It also confirmed that Co-V alloys are formed when V content exceeded 60 at%. Spin-orbit torque properties were analyzed by harmonics Hall measurement. Out of all the samples measured, the sample with W content of 80 at% and V of 20 at% showed the maximum damping-like torque efficiency of -0.45 ± 0.04. ξDL decreased drastically when V content exceeded 20 at% because phase transition from β-W to α-W occurred. We also fabricated heterostructures of W (5)/CoFeB (0.9)/MgO (1)/Ta (2) and W80V20 (5)/CoFeB (0.9)/MgO (1)/Ta (2) to obtain perpendicular magnetic anisotropy. These samples were used to acquire optical microscope images and determine switching current densities. We utilized Magneto-Optic Kerr Effect microscope to observe and obtain current-induced spin-orbit torque switching images for the W80V20 alloy-based sample. The change in the contrast of the images successfully depicted the magnetization switching of the ferromagnetic CoFeB layers. The switching current (current density) was 11 mA (2.2 × 10<SUP>7</SUP> A cm<SUP>-2</SUP>) and 6 mA (1.2 × 10<SUP>7</SUP> A cm<SUP>-2</SUP>) for β-W and W80V20, respectively. The switching current is clearly reduced when W80V20 is used instead of pristine W. We hope that this work will play as a key role in the field of spintronics in the future. 〈그림 본문참조〉
Phylodynamic analysis of canine parvovirus type 2 (CPV-2) in Korea
Kyoung-Ki Lee(Kyoung-Ki Lee),Ji-Young Park(Ji-Young Park),JiUng Jang(JiUng Jang),Sung-Hee Kim(Sung-Hee Kim),Boyoun Moon(Boyoun Moon),Hye-Young Jung(Hye-Young Jung),Bok-Gyeong Gu(Bok-Gyeong Gu) 한국예방수의학회 2022 한국예방수의학회 학술대회자료집 Vol.2022 No.-
Kim, Youngji,Jung, Kyungmin,Cho, Jiung,Hyun, Jerome K. American Chemical Society 2019 ACS NANO Vol.13 No.9
<P>Despite their distinctive chemical properties, lossy metals are generally avoided in the design of structural colors because the optical losses can degrade the color vibrancy. Herein, we demonstrate a strategy that allows lossy metals supporting near-wavelength dielectric gratings to achieve high color vibrancy by benefiting from the optical loss rather than suffering from it. By exciting the grating rotated 45° relative to the incident field, s-polarized (s-pol) and p-polarized (p-pol) light each excites a spectrally distinct resonance, described by a treatment of coupled waveguide-array modes, that retards the phase over the wavelength. Owing to the birefringence, a cross-polarized reflection spectrum displays two sharp peaks from each component that decreases the monochromaticity. We show that lossy metals can minimize the p-pol contribution, leaving the sharp s-pol response to determine the spectrum and generate high color vibrancy. Through this scheme, we demonstrate that lossy metal substrates including Pt, a catalytically active metal, and W, a CMOS-compatible metal, can achieve larger sRGB gamut coverage ratios of 90% and 69%, respectively, than that of 55% from Ag, while maintaining similar pixel contrast ratios to that of Ag.</P> [FIG OMISSION]</BR>
Prognosis evaluation of a great dane dog with dilated cardiomyopathy
Kim, Yun-Hye,Na, Jiung,So, Kyung-Min,Park, Chul The Korean Society of Veterinary Service 2017 韓國家畜衛生學會誌 Vol.40 No.4
A five-year-old, male, Great Dane weighing 107 kg was presented with anorexia, abdominal distension, and dyspnea for 5 days. Physical examination, blood works, radiography, electrocardiography (ECG), and echocardiography were performed. Based on severely low fractional shortening (FS) and marked four chamber enlargement in echocardiography, continuous atrial fibrillation and occasional ventricular premature complex (VPC) on ECG, the dog was diagnosed as dilated cardiomyopathy (DCM) concurrent with congestive heart failure. Pleural effusion and ascites were modified transudate. In accordance with DCM scoring system recommended by European Society of Veterinary Cardiology (ESVC), DCM score was 13/15 in this case. Concentrations of cTnI and NT-pro-BNP were 1.0 ng/mL and 693 pmol/L, respectively. Since the former and the latter were remarkably high values, it was certain that the patient had grave prognosis. Intensive care was performed for the dog and the clinical signs as well as the radiographic abnormalities were resolved. However, when he presented serious dyspnea again at 25 days post therapy, the dog was dead. In case of canine DCM, the scoring system for the diagnosis and cardiac biomarkers including NT-pro-BNP and cTnI could be useful to advise owners on the status and prognosis of their dog with DCM.