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Quality Assessment and Forecast Sensitivity of Global Remote Sensing Observations

Advances in Atmospheric Sciences 2017年第3期34卷 371-382页

作者： Swapan MALLICK Devajyoti DUTTA ki-hong min School of Earth System Sciences Kyungpook National UniversityDaegu 41566South Korea National Centre for Medium Range Weather Forecasting Earth System Science OrganizationNoida 201309India

The satellite-derived wind from cloud and moisture features of geostationary satellites is an important data source for numerical weather prediction （NWP） models. These datasets and global positioning system radio occultation （GPSRO） satellite radiances are assimilated in the four-dimensional variational atmospheric data assimilation system of the UKMO Unified Model in India. This study focuses on the importance of these data in the NWP system and their impact on short-term 24-h forecasts. The quality of the wind observations is compared to the short-range forecast from the model background. The observation increments （observation minus background） are computed as the satellite-derived wind minus the model forecast with a 6-h lead time. The results show the model background has a large easterly wind component compared to satellite observations. The importance of each observation in the analysis is studied using an adjoint-based forecast sensitivity to observation method. The results show that at least around 50% of all types of satellite observations are beneficial. In terms of individual contribution, METEOSAT-7 shows a higher percentage of impact （nearly 50%）, as compared to GEOS, MTSAT-2 and METEOSAT-10, all of which have a less than 25% impact. In addition, the impact of GPSRO, infrared atmospheric sounding interferometer （IASI） and atmospheric infrared sounder （AIRS） data is calculated. The GPSRO observations have beneficial impacts up to 50 km. Over the Southern Hemisphere, the high spectral radiances from IASI and AIRS show a greater impact than over the Northern Hemisphere. The results in this study can be used for further improvements in the use of new and existing satellite observations.

关键词： wind observation increment observation impact forecast sensitivity to observation

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A Case Study of Mesoscale Convective Band(MCB) Development and Evolution along a Quasi-stationary Front

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Advances in Atmospheric Sciences 2014年第4期31卷 901-915页

作者： Daeun JEONG ki-hong min Gyuwon LEE Kyung-Eak kiM Climate Research Department Asia-Pacific Economic Cooperation Climate Center Center for Atmospheric Remote Sensing Kyungpook National University Department of Astronomy and Atmospheric Sciences Kyungpook National University Department of Earth Atmospheric and Planetary Sciences Purdue University

This paper presents a case study of mesoscale convective band （MCB） development along a quasi-stationary front over the Seout metropolitan *** MCB,which initiated on 1500 UTC 20 September 2010 and ended on 1400 UTC 21 September 2010,produced a total precipitation amount of 259.5 *** MCB development occurred during a period of tropopause folding in the upper level and moisture advection with a low-level *** analyses show that the evolution of the MCB can be classified into five periods：（1） the cell-forming period,when convection initiated; （2） the frontogenetic period,when the stationary front formed over the Korean peninsula; （3） the quasi-stationary period,when the convective band remained over Seoul for 3 h; （4） the mature period,when the cloud cover was largest and the precipitation rate was greater than 90 mm h-1; and （5） the dissipating period,when the MCB diminished and *** synoptic,thermodynamic,and dynamic analyses show that the MCB maintained its longevity by a tilted updraft,which headed towards a positive PV *** was concentrated under this area,where a tilted ascending southwesterly converged with a tilted ascending northeasterly,at the axis of cyclonic *** formation of the convective cell was attributed in part by tropopause folding,which enhanced the cyclonic vorticity at the surface,and by the low-level convergence of warm moist air and upperlevel *** southwesterly flow ascended in a region with high moisture content and strong relative vorticity that maintained the development of an MCB along the quasi-stationary front.

关键词： convective band quasi-stationary front potential vorticity tropopause folding heavy precipitation

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Impacts of statin and metformin on neuropathy in patients with type 2 diabetes mellitus: Korean Health Insurance data

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World Journal of Clinical Cases 2021年第33期9卷 10198-10207页

作者： hong ki min Se Hee kim Jong Han Choi Kyomin Choi Hae-Rim kim Sang-Heon Lee Department of Internal Medicine Konkuk University Medical CenterSeoul KS013South Korea Department of Neurology Konkuk University Medical CenterSeoul KS013South Korea Division of Rheumatology Department of Internal MedicineKonkuk University School of MedicineSeoul KS013South Korea

BACKGROUND Neuropathy is a common chronic complication in type 2 diabetes mellitus(T2DM).Statin and metformin are commonly used medications in T2DM patients,and some studies showed statin-or metformin-induced *** To evaluate the incidence of neuropathy among patients with T2DM associated with statin and metformin *** Korean Health Insurance Review and Assessment national patient sample data from 2016 and 2017 were *** with T2DM and no complications were divided into statin/metformin/statin+metformin users and *** incidence was defined by International Statistical Classification of Diseases and Related Health Problems,10th revision codes and concomitant prescriptions for anticonvulsants or *** regression analyses were conducted to examine the associations between statin/metformin/statin+metformin therapies and the incidence of *** score(PS)matching was performed on the basis of age,sex and *** Overall,34964 and 35887 patients with T2DM and no complications were included in the Korean Health Insurance Review and Assessment national patient sample datasets from 2016 and 2017,*** therapy was associated with increased risks of neuropathy in 2016 and 2017[PS-matched odds ratio(OR)=1.22,95%confidence interval(CI):1.08-1.38;PS-matched OR=1.17,95%CI:1.03-1.33,respectively].Metformin therapy was associated with reduced risks of neuropathy in 2016 and 2017(PS-matched OR=0.30,95%CI:0.21-0.42;PSmatched OR=0.44,95%CI:0.32-0.60,respectively).Combined statin+metformin therapy was not significantly associated with neuropathy in 2016 or 2017(PSmatched OR=0.85,95%CI:0.61-1.19;PS-matched OR=0.95,95%CI:0.66-1.38,respectively).CONCLUSION Statin therapy was associated with enhanced risk of new-onset neuropathy in patients with T2DM,but metformin therapy showed the opposite association.

关键词： Diabetes mellitus Neuropathies Hydroxymethylglutaryl-CoA reductase inhibitors Metformin

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Effects of 3D deformation and nonlinear stress–strain relationship on the Brazilian test for a transversely isotropic rock

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第12期15卷 3221-3229页

作者： Juhyi Yim Yoonsung Lee Seungki hong ki-Bok min R&D Center Hyundai Engineering and Construction75Yulgok-roJongno-guSeoulRepublic of Korea Department of Energy Systems Engineering and Research Institute of Energy and Resources Seoul National University1Gwanak-roGwanak-guSeoul08826Republic of Korea

To improve the accuracy of indirect tensile strength for a transversely isotropic rock in the Brazilian test, this study considered the three-dimensional (3D) deformation and the nonlinear stress–strain relationship. A parametric study of a numerical Brazilian test was performed for a general range of elastic constants, revealing that the 3D modeling evaluated the indirect tensile strength up to 40% higher than the plane stress modeling. For the actual Asan gneiss, the 3D model evaluated the indirect tensile strength up to 10% higher and slightly enhanced the accuracy of deformation estimation compared with the plane stress model. The nonlinearity in stress–strain curve of Asan gneiss under uniaxial compression was then considered, such that the evaluated indirect tensile strength was affected by up to 10% and its anisotropy agreed well with the physical intuition. The estimation of deformation was significantly enhanced. The further validation on the nonlinear model is expected as future research.

关键词： Anisotropy Transversely isotropy Brazilian test Indirect tensile strength Nonlinearity 3D modeling

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Factor analysis of recent major heatwaves in East Asia

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Geoscience Frontiers 2024年第1期15卷 374-383页

作者： Arim Yoon Jeongwon kim Jooyeop Lee Hyun min Sung Je-Woo hong Seung-ki min Junhong Lee Jinkyu hong Ecosystem-Atmosphere Process Laboratory Department of Atmospheric SciencesYonsei UniversitySeoul 03722Republic of Korea National Institute of Meteorological Sciences Jeju 63568Republic of Korea Korea Adaptation Center for Climate Korea Environment InstituteSejong 30121Republic of Korea Division of Environmental Science and Engineering Pohang University of Science and TechnologyPohang 37673Republic of Korea Max Planck Institute for Meteorology Hamburg 20146Germany Institute for Convergence Research and Education in Advanced Technology Yonsei UniversitySeoulRepublic of Korea

Heatwaves(HWs)present a major hazard to our society and more extreme heatwaves are expected with future climatic ***,it is important to improve our understanding of the underlying processes that drive HWs,in order to boost our socioeconomic-ecological *** this study,we quantified the influences of key driving factors(large-scale atmospheric circulation,soil moisture,and sea surface temperature)and their synergies on recent heatwaves in East *** conducted a factor separation analysis for three recent HW events by constraining the key factors in the regional Weather Research and Forecasting model with their climatologies or pseudo-observations in different *** study showed distinct spatial variations in the HW-controlling factors in East *** synergistic interaction of large-scale circulation and soil moisture was the most important factors in the 2013 Chinese *** the 2018 HWs in Korea and Japan,the same stagnant large-scale atmospheric circulation played a dominant role in driving the HW *** land-atmosphere coupling via soil moisture,its interaction with circulation,and SST exhibited stronger influences during the Korean HW than the Japanese *** analysis also revealed temporal variations in the factors driving Korean and Chinese HWs due to typhoon passage and other multiple processes over heterogeneous surfaces(i.e.,topographically induced Foehn winds,large-scale warm advection from the warm ocean,spatial differences in soil moisture).Our findings suggest that future heatwave-related studies should consider interactive contributions of key factors,their interplay with surface heterogeneities of complex terrain.

关键词： Heatwave East Asia Large-scale circulation Soil moisture Sea surface temperature Synergistic impacts

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Classical Dynamics of Harmonic Generation of the Hydrogen Molecular Ion Interacting with Ultrashort Intense Laser Pulses

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Chinese Physics Letters 2001年第2期18卷 236-238页

作者： LI Chao-hong DUAN Yi-Wu Wing-ki Liu Jian-min Yuan Department of Physics Hu’nan Normal UniversityChangsha 410081 Department of Physics University of WaterlooWaterlooOntarioN2L3G1Canada Department of Physics and Atmospheric Science Drexel UniversityPhiladelphiaPA19104USA Laboratory of Magnetic Resonance and Atomic and Molecular Physics Wuhan Institute of Physics and MathematicsChinese Academy of SciencesWuhan 430071

Within Born--Oppenheimer approximation,by using the classical trajectory theory,a description for the high-order harmonic generation of the hydrogen molecular ion interacting with ultrashort laser pulses has been *** Coulomb singularities have been remedied by the *** action-angle variables have been used to generate the initial inversion symmetry microcanonical *** a proper intensity range,a harmonic plateau with only odd harmonics *** a larger intensity,because of the existence of chaos,the harmonic spectra become *** a large enough intensity,the ionization takes place and the harmonics *** the chaos causes the noises,the ionization suppresses the harmonic generation,and the onset of the ionization follows the onset of chaos.

关键词： harmonic harmonics chaos

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Driving inward growth of lithium metal in hollow microcapsule hosts by heteroatom‐controlled nucleation

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Carbon Energy 2024年第8期6卷 262-272页

作者： Siwon kim hong Rim Shin ki Jae kim min‐Sik Park Jong‐Won Lee Division of Materials Science and Engineering Hanyang UniversitySeoulRepublic of Korea Department of Energy Science and Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)DaeguRepublic of Korea Department of Energy Science Sungkyunkwan UniversitySuwonRepublic of Korea Department of Advanced Materials Engineering for Information and Electronics Integrated Education for Frontier Science and Technology(BK21 Four)Kyung Hee UniversityYonginRepublic of Korea

The application of Li metal anodes in rechargeable batteries is impeded by safety issues arising from the severe volume changes and formation of dendritic Li ***‐dimensional hollow carbon is receiving increasing attention as a host material capable of accommodating Li metal inside its cavity;however,uncontrollable and nonuniform deposition of Li remains a *** this study,we synthesize metal–organic framework‐derived carbon microcapsules with heteroatom clusters(Zn and Ag)on the capsule walls and it is demonstrated that Ag‐assisted nucleation of Li metal alters the outward‐to‐inward growth in the microcapsule ***‐incorporated microcapsules are prepared via chemical etching of zeolitic imidazole framework‐8 polyhedra and are subsequently decorated with Ag by a galvanic displacement reaction between Ag^(+) and metallic *** introduced Ag significantly reduces the energy barrier and increases the reaction rate for Li nucleation in the microcapsule host upon Li *** combined electrochemical,microstructural,and computational studies,we verify the beneficial role of Ag‐assisted Li nucleation in facilitating inward growth inside the cavity of the microcapsule host and,in turn,enhancing electrochemical *** study provides new insights into the design of reversible host materials for practical Li metal batteries.

关键词： hollow carbon hosts lithium metal batteries lithium plating metal-organic frameworks nucleation

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Synergistically enhanced ORR and HER performance on Co-N-C coupled in-situ generated PtCo intermetallic

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Journal of Energy Chemistry 2025年第1期100卷 721-729页

作者： Guanyu Luo min Song Lulu An Xiao Huang Qian Zhang Chenhao Zhang Tao Shen Shuang Wang Deli Wang Key Laboratory of Material Chemistry for Energy Conversion and Storage (Huazhong University of Science and Technology) ministry of Education School of Chemistry and Chemical Engineering Huazhong University of Science and Technology

Integrating multi-scale sites in a composite catalyst is vital to realize efficient ***,a synergistic composite catalyst consisting of Co atomic sites and in-situ generated PtCo intermetallic compounds （IMCs）(o-PtCo@CoNC) is proposed through Co pre-anchoring and subsequent impregnation-reduction *** loading of Co atoms provides a chance for in-situ generating PtCo ordered intermetallic *** remaining Co single atoms and PtCo IMCs construct synergistic electrocatalytic *** from the ordered structure,synergistic effect of Pt Co IMCs and Co single atoms,o-PtCo@CoNC exhibits excellent electrocatalytic performance for oxygen reduction reaction （ORR） and hydrogen evolution reaction （HER） with mass activity of 1.21 A mgPt-1（at 0.9 V） and5.70 A mgPt-1（at an overpotential of 100 mV）,***,o-PtCo@CoNC delivers negligible loss of half-wave potential and overpotential during long-term stability test in acid solutions,with 13 mV decay after 50,000 potential cycles for ORR and a 2.7 mV decay after 20,000 potential cycles for *** integration strategy of single-atomic sites coupled IMCs paves the way for enhancing the activity and durability of Pt-based electrocatalysts.

关键词： Electrolytic reduction

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Porous Organic Cage‑Based Quasi‑Solid‑State Electrolyte with Cavity‑Induced Anion‑Trapping Effect for Long‑Life Lithium Metal Batteries

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Nano-Micro Letters 2025年第2期17卷 376-386页

作者： Wei-min Qin Zhongliang Li Wen‑Xia Su Jia‑min Hu Hanqin Zou Zhixuan Wu Zhiqin Ruan Yue‑Peng Cai Kang Li Qifeng Zheng School of Chemistry South China Normal UniversityGuangzhou 510006People’s Republic of China Key Laboratory of Functional Metal‑Organic Compounds of Hunan Province College of Chemistry and Material ScienceHengyang Normal UniversityHengyang 421008People’s Republic of China Guangzhou Key Laboratory of Energy Conversion and Energy Storage Materials Guangzhou 510006People’s Republic of China

Porous organic cages(POCs)with permanent porosity and excellent host–guest property hold great potentials in regulating ion transport behavior,yet their feasibility as solid-state electrolytes has never been testified in a practical ***,we design and fabricate a quasi-solid-state electrolyte(QSSE)based on a POC to enable the stable operation of Li-metal batteries(LMBs).Benefiting from the ordered channels and cavity-induced anion-trapping effect of POC,the resulting POC-based QSSE exhibits a high Li+transference number of 0.67 and a high ionic conductivity of 1.25×10^(−4) S cm^(−1) with a low activation energy of 0.17 *** allow for homogeneous Li deposition and highly reversible Li plating/stripping for over 2000 *** a proof of concept,the LMB assembled with POC-based QSSE demonstrates extremely stable cycling performance with 85%capacity retention after 1000 ***,our work demonstrates the practical applicability of POC as SSEs for LMBs and could be extended to other energy-storage systems,such as Na and K batteries.

关键词： Porous organic cage Cavity-induced anion-trapping Quasi-solid-state electrolyte Homogeneous Li+flux Lithium metal battery

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Automated X-ray Defect Inspection on Occluded BGA Balls Using Hybrid Algorithm

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Computers, Materials & Continua 2023年第6期75卷 6337-6350页

作者： ki-Yeol Eom Byungseok min Department of AI Bigdata Suseong UniversityDaegu42078Korea R&D Center XAVIS Co.Ltd.Seongnam-si13202Korea

Automated X-ray defect inspection of occluded objects has been an essential topic in semiconductors,autonomous vehicles,and artificial intelligence ***,there are few solutions to segment occluded objects in the X-ray inspection *** particular,in the Ball Grid Array inspection of X-ray images,it is difficult to accurately segment the regions of occluded solder balls and detect defects inside solder *** this paper,we present a novel automatic inspection algorithm that segments solder balls,and detects defects fast and efficiently when solder balls are *** proposed algorithm consists of two *** the first stage,the defective candidates or defects are determined through the following four steps:(i)image preprocessing such as noise removal,contrast enhancement,binarization,connected component,and morphology,(ii)limiting the inspec-tion area to the ball regions and determining if the ball regions are occluded,(iii)segmenting each ball region into one or more regions with similar gray values,and(iv)determining whether there are defects or defective candidates in the regions using a weighted sum of local threshold on local *** there are defective candidates,the determination of defects is finally made in the following *** the second stage,defects are detected using the automated inspection technique based on oblique computed *** 3D precision inspection process is divided into four steps:(i)obtaining 360 projection images(one image per degree)rotating the object from 0 to 360 degrees,(ii)reconstructing a 3D image from the 360 projected images,(iii)finding the center slice of gravity for solder balls from the axial slice images in the z-direction,and getting the inspection intervals between the upper bound and the lower bound from the center slice,and(iv)finally determining whether there are defects in the averaged image of solder *** proposed hybrid algorithm is robust for segmenting the defects inside o

关键词： Hybrid voids BGA X-ray inspection defects

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