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Kihyun Park,Byung-Il Min,Sora Kim,Jiyoon Kim,Kyung-Suk Suh 한국방사성폐기물학회 2020 방사성폐기물학회지 Vol.18 No.2(E)
북한은 2017년 9월 3일 풍계리 핵실험장에서 6차 지하 핵실험을 단행하였다. 이전에 수행했던 핵실험들과 달리 풍계리 핵 실험장 주변에서 몇 차례의 유발지진이 발생하였고 이로 인해 지하에 갇혀 있던 방사성제논이 대기 중으로 방출되는데 영향을 끼쳤을 것으로 예상된다. 본 연구에서는 북한의 6차 핵실험 이후에 발생한 유발지진을 고려하여 핵실험으로 발생한 방사성제논의 몇 가지 방출 시나리오에 따른 대기확산 모의실험을 본 연구진이 개발한 LADAS (Lagrangian Atmospheric Dose Assessment System) 모델에 기상청의 수치예보자료를 적용하여 수행하였다. 방사성제논의 가능한 검출 위치와 시간을 찾기 위해, 1일 간격 및 1주일 간격의 지연방출뿐만 아니라 유발지진으로 유출된 지연방출 시나리오도 설정하였다. 포괄 적핵실험금지조약기구(Comprehensive Nuclear-Test-Ban Treaty Organization)에서 운영중인 전세계관측망(International Monitoring System)과 원자력안전위원회의 133Xe 탐지 결과는 유발지진으로 유출된 방사성제논의 방출 시나리오에 따른 모의실험의 결과와 대체로 부합되었다. North Korea conducted the sixth underground nuclear test on September 3, 2017 at the Punggye-ri Nuclear Test Site (NTS). In contrast to the previous five nuclear tests, several induced earthquakes occurred around the NTS after the sixth nuclear test and this may have caused radioxenon leakages at the site. Considering these reported earthquakes, we performed atmospheric dispersion simulations on some radioxenon emission scenarios for this event using our Lagrangian Atmospheric Dose Assessment System (LADAS) model by employing the Unified Model (UM) based numerical weather prediction data produced by the Korea Meteorological Administration (KMA). To find out possible detection locations and times, we combined not only daily and weekly based delayed releases but also leakages after the reported earthquakes around the NTS to create emission scenarios. Our simulation results were generally in good agreement with the measured data of the Nuclear Safety and Security Commission and International Monitoring System (IMS) stations operated by the Comprehensive nuclear Test-Ban-Treaty Organization (CTBTO).
Facilitated Protein-DNA Binding: Theory and Monte Carlo Simulation
Kihyun Park,김효준 대한화학회 2012 Bulletin of the Korean Chemical Society Vol.33 No.3
The facilitated diffusion effect on protein-DNA binding is studied. A rigorous theoretical approach is presented to deal with the coupling between one-dimensional and three-dimensional diffusive motions. For a simplified model, the present approach can provide numerically exact results, which are confirmed by the lattice-based Monte Carlo simulations.
Kihyun Park,Byung-Il Min,Sora Kim,Jiyoon Kim,Kyung-Suk Suh 한국방사성폐기물학회 2022 한국방사성폐기물학회 학술논문요약집 Vol.20 No.2
As part of the third ATM Challenge, we performed a series of atmospheric dispersion simulations for routine releases of Xe-133 from ordinarily operating nuclear facilities such as Medical Isotope Production Facilities (MIPFs), Nuclear Power Plants (NPPs), and Research Reactors (RRs) in the Northern Hemisphere using our ATM, Lagrangian Atmospheric Dose Assessment System (LADAS), with Numerical Weather Prediction (NWP) data produced by the Korea Meteorological Administration (KMA). The simulation time period is 6 months, from June to November in 2014, and we used the stack emission data except for CNL (Canada) and IRE (Belgium) in accordance with the scenario of the third ATM Challenge 2019. In addition, the simulations were done individually for all MIPFs, NPPs, and RRs. We utilized 3-hourly KMA’s Unified Model Global Data Assimilation and Prediction System (UM-GDAPS) data with 0.35°×0.23° horizontal resolution as input meteorological fields and extracted hourly time series results for Xe-133 activity concentrations with few different resolutions such as 0.5°×0.5°, 0.35°×0.23°, and 0.1°×0.1° at several IMS stations in the Northern Hemisphere which were in normal operation in 2014. Considering previously reported values of daily Xe-133 release amounts for CNL and IRE, measured signals at some IMS stations (such as CAX17, DEX33, SEX63, and USX75) were well reproduced from the simulation results.
Assessment of LVEF and volume parameters measured by 640-slice MDCT: a comparison with 2-D TTE
( Ki Hyun Park ),( Kwang Seok Kim ),( Jae Young Hur ),( Se Jin Byun ),( Seo Hwa Park ),( Eun Gyu Kang ),( Seong Bo Yoon ) 대한내과학회 2013 대한내과학회 추계학술발표논문집 Vol.2013 No.1
Objective: To compare left ventricular function and volume parameters measured by 640-slice multidetector CT (MDCT, 320-detector rows, with 160mm coverage, and 640 slices per rotation) with that measured by two-dimensional transthoracic echocardiography (2D-TTE). Method: 227 consecutive patients (men: 101, mean age: 63.4±12.9 years) were enrolled for evaluation of chest pain and dyspnea. End diastolic volume (EDV), end systolic volume (ESV), left ventricular ejection fraction (LVEF) were measured by both 640- slice MDCT and 2D-TTE, and the correlation coefficients were assessed. Result: On 640-slice MDCT, average EDV was 114.0±42.4 mL, average ESV was 46.0±33.4 mL, average LVEF was 67.1±12.1%. On 2D-TTE, average EDV was 161.0±40.0 mL, average ESV was 43.0±32.4 mL, average LVEF was 62.0±10.9%. Correlations between MDCT and 2D-TTE were that EDV (r: 0.794, p<0.001); ESV (r: 0.874, p<0.001) and LVEF (r: 0.738, p<0.001). Conclusion: There was a good correlation between 640-slice MDCT and 2D-TTE in the evaluation of left ventricular function and volume parameters.