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Jo, Hyun-Young,Lee, Hyo-Jung,Jo, Yu-Jin,Lee, Jong-Jae,Ban, Soojin,Lee, Jin-Ju,Chang, Lim-Seok,Heo, Gookyoung,Kim, Cheol-Hee Elsevier 2019 Atmospheric research Vol.225 No.-
<P><B>Abstract</B></P> <P>This study investigated the potential of fine nitrate (NO<SUB>3</SUB> <SUP>−</SUP> in PM<SUB>2.5</SUB>) formation in Seoul Metropolitan Area (SMA) by nighttime dinitrogen pentoxide (N<SUB>2</SUB>O<SUB>5</SUB>) heterogeneous chemistry during March 16–18, 2016, relatively dry and stagnant early spring days, by intervening N<SUB>2</SUB>O<SUB>5</SUB> uptake coefficients (reactive uptake probability, γN<SUB>2</SUB>O<SUB>5</SUB>) in modeling with WRF-CMAQ. Simulations of a base case and two sensitivity tests with default (Davis et al., 2008), zero and decupled (tenfold) γN<SUB>2</SUB>O<SUB>5</SUB> showed that impacts of γN<SUB>2</SUB>O<SUB>5</SUB> on NO<SUB>3</SUB> <SUP>−</SUP> and PM<SUB>2.5</SUB> are sensitive to relative humidity (RH) and sulfate-nitrate-ammonium (SNA) conditions. The base case simulation generally underestimated NO<SUB>3</SUB> <SUP>−</SUP> and PM<SUB>2.5</SUB> levels in comparison to observations. Even with decupled γN<SUB>2</SUB>O<SUB>5</SUB>, modeled NO<SUB>3</SUB> <SUP>−</SUP> and PM<SUB>2.5</SUB> concentrations showed relatively small increases under conditions that RH is relatively low in the range of 20 to 40% and SNA levels are severely underestimated (e.g., lower by one third) in the base case simulation. Comparisons of NO<SUB>3</SUB> <SUP>−</SUP> and PM<SUB>2.5</SUB> concentrations in SMA between simulations with differently specified γN<SUB>2</SUB>O<SUB>5</SUB> indicated that N<SUB>2</SUB>O<SUB>5</SUB> heterogeneous chemistry has potential to (1) form additional nitric acid (HNO<SUB>3</SUB>), (2) further react with ammonia (NH<SUB>3</SUB>) emitted from various sources including agricultural sources outside of SMA urban-core areas, and (3) contribute to NO<SUB>3</SUB> <SUP>−</SUP> and PM<SUB>2.5</SUB> formation in SMA. Additional modeling and observational studies on heterogeneous N<SUB>2</SUB>O<SUB>5</SUB> chemistry are needed to improve our understanding of NO<SUB>3</SUB> <SUP>−</SUP> and PM<SUB>2.5</SUB> formation and better forecast PM<SUB>2.5</SUB> pollution levels over SMA or other urban areas with abundant nitrogen oxides emissions and ammonia emissions such as agricultural emissions from surrounding areas.</P> <P><B>Highlights</B></P> <P> <UL> <LI> N<SUB>2</SUB>O<SUB>5</SUB> heterogeneous chemistry in the PM<SUB>2.5</SUB> formation was investigated by intervening the uptake coefficient (rN<SUB>2</SUB>O<SUB>5</SUB>). </LI> <LI> Simulations with the improved uptake coefficient (rN<SUB>2</SUB>O<SUB>5</SUB>) contributed to better PM<SUB>2.5</SUB> prediction in some conditons. </LI> <LI> Observational studies are needed to understand the nitare formation in the areas with abundant NO<SUB>x</SUB> and NH<SUB>3</SUB> emissions. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Fabrication and Characterization of Finite-Size DNA 2D Ring and 3D Buckyball Structures
Jo, Soojin,Kim, Seungjae,Lee, Byung Ho,Tandon, Anshula,Kim, Byunghoon,Park, Sung Ha,Kim, Moon Ki MDPI 2018 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.19 No.7
<P>In order to incorporate functionalization into synthesized DNA nanostructures, enhance their production yield, and utilize them in various applications, it is necessary to study their physical stabilities and dynamic characteristics. Although simulation-based analysis used for DNA nanostructures provides important clues to explain their self-assembly mechanism, structural function, and intrinsic dynamic characteristics, few studies have focused on the simulation of DNA supramolecular structures due to the structural complexity and high computational cost. Here, we demonstrated the feasibility of using normal mode analysis for relatively complex DNA structures with larger molecular weights, i.e., finite-size DNA 2D rings and 3D buckyball structures. The normal mode analysis was carried out using the mass-weighted chemical elastic network model (MWCENM) and the symmetry-constrained elastic network model (SCENM), both of which are precise and efficient modeling methodologies. MWCENM considers both the weight of the nucleotides and the chemical bonds between atoms, and SCENM can obtain mode shapes of a whole structure by using only a repeated unit and its connectivity with neighboring units. Our results show the intrinsic vibrational features of DNA ring structures, which experience inner/outer circle and bridge motions, as well as DNA buckyball structures having overall breathing and local breathing motions. These could be used as the fundamental basis for designing and constructing more complicated DNA nanostructures.</P>
딥러닝 모델을 이용한 영상 기반 항만시설물 손상 탐지 프레임워크
조수진 ( Cho Soojin ),배숙경 ( Bae Suk-kyoung ),민지영 ( Min Jiyoung ) 한국구조물진단유지관리공학회 2022 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.26 No.2
우리나라에는 60개의 항만에 총 1,086개의 항만시설이 존재하며, 그중 30년이 지난 노후시설은 총 284개(27.7%)나 된다. 현재 항만시설물은 육안 점검을 통해 유지관리가 수행되고 있으나, 항만시설물의 규모와 접근성의 어려움으로 인해 많은 노동력과 작업시간, 그리고 점검자의 위험 노출의 문제점을 안고 있다. 본 연구에서는 영상으로 항만시설물을 촬영하고, 촬영된 영상을 학습된 딥러닝 모델을 이용하여 검출하는 항만시설물 손상 탐지 프레임워크를 제안하였다. 실제 항만에서 촬영한 영상을 이용하여 제안한 프레임워크의 성능을 검증한 결과, 높은 정확도로 손상을 자동 탐지할 수 있음을 보였다.
조수진 ( Soojin Jo ),( Maksim Kostiulin ),심명규 ( Myungkyu Shim ) 서강대학교 지암남덕우경제연구원 2023 시장경제연구 Vol.52 No.2
본 논문은 한국의 실업률과 물가상승률의 관계를 분석한다. 이를 위해 Hazell et al. (2022)의 최신 방법론을 한국의16개 주요 지역별 비교역재 소비자 물가지수와 실업률 자료에 적용하여 국가 전체 및 지역별 필립스곡선을 추정하였다. 분석 결과, 1992년-2018년 사이의 데이터를 이용하여 추정된 필립스 곡선의 기울기는 작았고, 2000년대 중반 이후 해당 기울기가 더욱 줄어든 것으로 나타났다. 하지만 시간 고정효과를 추가로 고려할 경우 기울기의 통계적 유의성이 전반적으로 없어지는 것을 확인하였다. This paper investigates the relationship between unemployment and inflation rates in South Korea. In particular, we apply a methodology recently developed by Hazell et al. (2022) to estimate both aggregate and regional Phillips curves based on price indices for non-tradable items and unemployment data for 16 first-tier administrative divisions in South Korea. We find that the estimated slope of the Phillips curve was small during 1992-2018 and became flattened since the mid-2000s. Controlling for time-fixed effects, however, weakens the magnitudes and statistical significance of overall estimates.
Cho, Soojin,Jo, Hongki,Jang, Shinae,Park, Jongwoong,Jung, Hyung-Jo,Yun, Chung-Bang,Spencer, Billie F. Jr.,Seo, Ju-Won Techno-Press 2010 Smart Structures and Systems, An International Jou Vol.6 No.5
This paper analyses the data collected from the $2^{nd}$ Jindo Bridge, a cable-stayed bridge in Korea that is a structural health monitoring (SHM) international test bed for advanced wireless smart sensors network (WSSN) technology. The SHM system consists of a total of 70 wireless smart sensor nodes deployed underneath of the deck, on the pylons, and on the cables to capture the vibration of the bridge excited by traffic and environmental loadings. Analysis of the data is performed in both the time and frequency domains. Modal properties of the bridge are identified using the frequency domain decomposition and the stochastic subspace identification methods based on the output-only measurements, and the results are compared with those obtained from a detailed finite element model. Tension forces for the 10 instrumented stay cables are also estimated from the ambient acceleration data and compared both with those from the initial design and with those obtained during two previous regular inspections. The results of the data analyses demonstrate that the WSSN-based SHM system performs effectively for this cable-stayed bridge, giving direct access to the physical status of the bridge.