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Arrangement of Subsequent Disposal Facilities in the Complex Disposal Facility
DongBin Shon,HyeongJoon Yun,MuGap Shin 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.1
Currently, the Gyeongju disposal facility is planned to be operated as a complex disposal facility with three types: cave disposal, surface disposal, and landfill disposal. Approximate method and arrangement have been decided up to the 1st, 2nd, and 3rd stage disposal facilities, but the optimal method for the arrangement of the entire complex disposal facility has not been established. When establishing the subsequent disposal facility arrangement plan, the generation prospect and disposal capacity setting plan for each level of radioactive waste was established, and the disposal capacity of the subsequent disposal facility, the disposal facility method, etc. were reviewed and reflected. Among the items for deriving an efficient management plan, KEPCO E&C is going to first derive a site arrangement plan for each disposal facility of 800,000 drums of radioactive waste, and has drawn up a plan for each scenario through collaboration with other organizations. When establishing the subsequent disposal facility arrangement plan, the generation prospect and disposal capacity setting plan for each level of radioactive waste was established, and the disposal capacity of the subsequent disposal facility, the disposal facility method, etc. were reviewed and reflected.
비뉴턴유체 해석을 위한 Fully Implicit ISPH 모델 개발
신동빈(Dongbin Shin),김지환(Jihwan Kim),변제윤(Je-Yun Byun),주영석(Young-Seok Joo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Highly viscous fluids are used in a wide range of applications such as natural disasters, computer graphics, and food industries, etc. Numerical approaches are mainly adopted to reproduce complex and nonlinear phenomena of highly viscous fluids. In this study, the fully implicit Incompressible Smoothed Particle Hydrodynamics (ISPH) model was developed to analyze highly viscous fluids, and the model was verified by comparing with the analytic solutions of Poiseuille flow and the experimental data of dam break. The proposed model can overcome the limitation of the large computational time interval that inevitably occur in the analysis of highly viscous fluids, so that it is expected that the model will be widely applicable to practical industries.
빔형성 위성 시스템의 동심원 배열 안테나에 대한 도래각 추정 성능 분석
김태윤(Tae-Yun Kim),Dongbin Lee,황석승(Suk-Seung Hwang) 한국전자통신학회 2020 한국전자통신학회 논문지 Vol.15 No.4
The phased array antenna has an advantage enabling rapid beam aim without the mechanical rotation of the antenna, because it arranges multiple elements in a linear or planer (grid or circular) and electronically controls the phase for each element. The planar array antenna is generally used a grid array and a circular array, and the circular form has the higher resolution comparing to the grid form due to the its structural characteristics. However, a concentric circular array (CCA) or a concentric ring array (CRA) with multiple circular arrays which each has different radius is used in the limited area, because the entire radius should be increased for the circular array with a number of elements. In this paper, we introduce the angle-of-arrival (AOA) estimator for an adaptive beamforming satellite system based on CRA and provide the simulation results for performance evaluation. In addition, simulation results are compared and analyzed to the case for the circular array antenna. 위상 배열 안테나는 다수개의 안테나 소자를 선형 혹은 평면(격자형 혹은 원형)으로 배열하여 각 소자에 대한 위상을 전자적으로 제어하여, 안테나의 기계적인 회전 없이 빔의 신속한 지향이 가능하다는 장점이 있다. 평면 배열 안테나는 주로 격자형 배열과 원형 배열을 사용하는데, 원형 배열이 구조적 특성상 격자형에 비해 높은 분해능을 가진다. 그러나 많은 요소를 사용하는 원형 배열의 경우 전체 배열의 반지름이 증가되어, 제한된 면적에서는 반지름이 각기 다른 다수개의 원형 배열을 가지는 동심원 배열(CCA : Concentric Circular Array or CRA : Concentirc Ring Array)을 사용하게 된다. 본 논문에서는 동심원 배열 안테나를 적용한 적응 빔형성 위성 시스템에서의 도래각 추정기를 소개하고 성능분석 결과를 제시한다. 또한, 원형 배열 안테나를 적용한 경우와의 성능을 비교/분석한다.
Potential harmful effects of viral hemorrhagic septicemia virus in mammals
Diem Tho Ho,김남은,Dongbin Yun,김기홍,Jae-Ok Kim,Gwang Il Jang,김도형 한국수산과학회 2022 Fisheries and Aquatic Sciences Vol.25 No.6
Most of the emerging diseases that threaten humans are caused by RNA viruses which are extremely mutable during evolution. The fish RNA virus, viral hemorrhagic septicemia virus (VHSV) can infect a broad range of aquatic animal hosts, but the transmissibility of VHSV to mammals has not been thoroughly investigated. Therefore, our study aimed to investigate the potential adverse effects of VHSV in mammals. Briefly, the survival of VHSV was determined using only minimum essential media (MEM-2) and mammalian SNU-1411 and hepa-1c1c7s cells at 15℃ and 37℃. Mice (Mus musculus, 27.3 ± 1.9 g) were intravenously injected with VHSV (2.37E+05 TCID50 · mice–1) in triplicate. Clinical signs and survival rates were examined at 14 days post-challenge, and infection was confirmed in the surviving mice. The 50% tissue culture infective dose (TCID50) and polymerase chain reaction analysis were used to determine viral titers and the infection rate, respectively. The titer of VHSV suspended in MEM-2 at 15℃ was reduced by only one log after 8 days, whereas the virus maintained at 37℃ was inactivated 8 days post-inoculation (dpi). There were no recognizable cytopathic effects in either SNU-1411 or hepa-1c1c7s cells inoculated with VHSV at 15℃ and 37℃. VHSV in those cell lines at 37℃ was rapidly decreased and eventually inactivated at 12 dpi, whereas virus at 15℃ remained at low concentrations without replication. In vivo experiment showed that there were no signs of disease, mortality, or infection in VHSV-infected mice. The results of this study indicate that it is highly unlikely that VHSV can infect mammals including humans.
ISPM을 이용한 PECVD 공정 내 발생입자 측정 연구
김동빈,문지훈,김형우,강병수,윤주영,강상우,김태성,Kim, Dongbin,Mun, Jihun,Kim, HyeongU,Kang, Byung Soo,Yun, JuYoung,Kang, SangWoo,Kim, Taesung 한국입자에어로졸학회 2015 Particle and Aerosol Research Vol.11 No.4
Particles which generated from plasma enhanced chemical vapor deposition (PECVD) during thin film deposition process can affect to the process yield. By using light extinction method, ISPM can measure particles in the large-diameter pipe (${\leq}300mm$). In our research, in-situ particle monitor (ISPM) sensor was installed at the 300 mm diameter exhaust-line to count the particles in each size. In-house flange for mounting the transmitting and receiving parts of ISPM was carefully designed and installed at a certain point of exhaust line where no plasma light affect to the light extinction measurement. Measurement results of trend changes on particle count in each size can confirm that ISPM is suitable for real-time monitoring of vacuum process.