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Journal of Energy Chemistry 2025年第1期100卷 245-258页

作者： Gaeun Lee Yong nam Ahn Seongjoon So Chanwoo Park Jong-Seong Bae Taehyun Park Il Tae kim Jaehyun Hur School of Chemical Biological and Battery Engineering Gachon University Seongnam Busan Center Korea Basic Science Institute

Aqueous Zn-ion batteries （AZIBs） have received considerable attention owing to their various advantages such as safety,low cost,simple battery assembly conditions,and high ionic ***,they still suffer from serious problems,including uncontrollable dendrite growth,corrosion,hydrogen evolution reaction （HER） from water decomposition,electrode passivation,and unexpected *** creation of a uniform artificial nanocrystal layer on the Zn anode surface is a promising strategy for resolving these ***,we propose the use of a perovskite CaTiO3（CTO） protective layer on Zn（CTO@Zn） as a promising approach for improving the performance of *** CTO artificial layer provides an efficient pathway for Zn ion diffusion towards the Zn metal because of the high dielectric constant （εr=180） and ferroelectric characteristics that enable the alignment of dipole moments and redistribute the Zn2+ions in the CTO *** avoiding the direct contact of the Zn anode with the electrolyte solution,the uneven dendrite growth,corrosion,parasitic side reactions,and HER are mitigated,while CTO retains its mechanical and chemical robustness during ***,CTO@Zn demonstrates an improved lifespan in a symmetric cell configuration compared with bare ***@Zn shows steady overpotential （～68 m V） for 1500 h at 1 mA cm-2/0.5 mA h cm-2,excelling bare ***,when paired with the V2O5-C cathode,the CTO@Zn//V2O5-C full battery delivers 148.4 mA h g-1（based on the mass of the cathode） after 300 *** study provides new insights into Zn metal anodes and the development of high-performance AZIBs.

关键词： Perovskite

Nomogram for prediction of pathologic complete remission using biomarker expression and endoscopic finding after preoperative chemoradiotherapy in rectal cancer

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Chinese Journal of Cancer Research 2020年第2期32卷 228-241页

作者： Hyuk Hur min Soo Cho Woong Sub Koom Joon Seok Lim Tae Il kim Joong Bae Ahn Hoguen kim nam.kyu kim Division of Colon and Rectal Surgery Department of SurgerySeverance HospitalYonsei University College of MedicineSeoul 03722Korea Department of Radiation Oncology Severance HospitalYonsei University College of MedicineSeoul 03722Korea Departm ent of Radiology Research Institute of Radiological ScienceSeverance HospitalYonsei University College of MedicineSeoul 03722Korea Department of Internal medicine Institute of Gastroenterology Department of medical Oncology Severance HospitalYonsei University College of MedicineSeoul 03722Korea Department of Pathology Severance HospitalYonsei University College of MedicineSeoul 03722Korea

Objective:The aim of this study is to develop a nomogram for prediction of pathologic complete remission(p CR)after preoperative chemoradiotherapy(CRT)for rectal ***:m RNA expression levels of seven molecular markers[p53,p21,Ki-67,vascular endothelial growth factor(VEGF),CD133,CD24,CD44]were measured by reverse transcriptase polymerase chain reaction(RTPCR)in 120 rectal *** findings of clinical complete remission(c CR)and biologic variables were used to construct nomogram in the training group(n=80),which was validated in the validation group(n=40).Results:m RNA expression levels of four markers(p53,p21,Ki67,CD133)correlated with p CR(24/80,30.0%)in the training *** expression of p53 and/or high expression of p21,Ki67 and CD133 showed greater p CR rate.p CR was shown in 18(69.2%)of 26 cases showing endoscopic c CR in the training *** p CR rate was demonstrated in lower tumor location than middle tumor(19/49,38.8%vs.5/31,16.1%).A nomogram for prediction of p CR was developed from the multivariate prediction model using these six variables,which showed good discrimination ability in the training group[area under the curve(AUC)=0.945]and validation group(AUC=0.922).The calibration plot showed good agreement between actual and predicted p CR in both patient ***:Nomogram for assessment of p CR can be useful for making treatment decisions after CRT according to predicted responses.

关键词： Rectal cancer chemoradiotherapy treatment response molecular marker endoscopy nomogram

Imidazole linker‐induced covalent triazine framework-ZIF hybrids for confined hollow carbon super‐heterostructures toward a long‐life supercapacitor

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Carbon Energy 2023年第10期5卷 25-39页

作者： madagonda mVadiyar Ji‐Young kim Jee‐Hwan Bae kyung‐Wan nam Department of Energy and materials Engineering Dongguk UniversitySeoulSouth Korea Advanced Analysis&Data Center Korea Institute of Science and Technology(KIST)SeoulSouth Korea Advanced Energy and Electronic materials Research Center Dongguk UniversitySeoulSouth Korea

Carbon super-heterostructures with high nitrogen contents from the covalent hybrid precursors of covalent triazine frameworks(CTFs)and zeolitic imidazolic frameworks(ZIFs)are scarcely explored because of CTF's ordered structure and toxic superacid that dissolves or destabilizes the metal *** solve this problem,herein,we report a straightforward two-step pathway for the covalent hybridization of disordered CTF(d–CTF)–ZIF composites via preincorporation of an imidazole(Im)linker into ordered CTFs,followed by the imidazole-site-specific covalent growth of *** carbonization of these synthesized d–CTF−Im−ZIF hybrids results in unique hollow carbon super-heterostructures with ultrahigh nitrogen content(>18.6%),high specific surface area(1663m^(2)g^(−1)),and beneficial trace metal(Co/Zn NPs)contents for promoting the redox *** proof of concept,the obtained carbon super-heterostructure(Co–Zn–NC_(SNH)–800)is used as a positive electrode in an asymmetric supercapacitor,demonstrating a remarkable energy density of 61Wh kg^(−1)and extraordinary cyclic stability of 97%retention after 30,000 cycles at the cell *** presynthetic modifications of CTF and their covalent hybridization with ZIF crystals pave the way toward new design strategies for synthesizing functional porous carbon materials for promising energy applications.

关键词： asymmetric supercapacitor defective covalent triazine frameworks hollow carbon superheterostructures linker defect

Stability for Leipholz’s Type of Laminated Box Columns with Nonsymmetric Lay-Ups on Elastic Foundation

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Advances in Applied mathematics and mechanics 2015年第2期7卷 158-179页

作者： nam-Il kim Jaehong Lee Department of Architectural Engineering Sejong University98 Kunja DongKwangjin KuSeoul 143-747Korea

The stability behavior of the Leipholz’s type of laminated box columns with nonsymmetric lay-ups resting on elastic foundation is investigated using theﬁnite el-ement *** on the kinematic assumptions consistent with the Vlasov beam theory,a formal engineering approach of the mechanics of the laminated box column-s with symmetric and nonsymmetric lay-ups is *** extended Hamilton’s principle is employed to obtain the elastic stiffness and mass matrices,the Rayleigh damping and elastic foundation matrices,the geometric stiffness matrix due to dis-tributed axial force,and the load correction stiffness matrix accounting for the uni-formly distributed nonconservative *** evaluation procedures for the critical values of divergence andﬂutter loads with/without internal and external damping ef-fects are brieﬂy *** examples are carried out to validate the present theory with respect to the previously published ***,the inﬂuences of theﬁber angle change and damping on the divergence andﬂutter loads of the laminated box columns are parametrically investigated.

关键词： Leipholz column laminate stability divergence ﬂutter ﬁnite element analysis

mXene-based hybrid materials for electrochemical and photoelectrochemical H_(2) generation

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Journal of Energy Chemistry 2024年第6期93卷 111-125,I0004页

作者： Jun Young kim Seung Hun Roh Chengkai Xia Uk Sim Jung kyu kim School of material Science and Engineering North University of ChinaTaiyuan 030051China School of Chemical Engineering Sungkyunkwan University(SKKU)2066Seobu-roJangan-guSuwon 16419Republic of Korea Hydrogen Energy Technology Laboratory Korea Institute of Energy Technology(KENTECH)NajuJeollanamdo 58330Republic of Korea SKKU Advanced Institute of Nano Technology(SAINT) Sungkyunkwan University(SKKU)2066Seobu-roJangan-guSuwon 16419Republic of Korea

The conversion of solar energy to produce clean hydrogen fuel through water splitting is an emerging strategy for efficiently storing solar energy in the form of solar *** aligns with the increasing global demand for the development of an ideal energy alternative to fossil fuels that does not emit greenhouse ***(EC) and photoelectrochemical(PEC) water splitting technologies have garnered significant attention worldwide for advanced hydrogen solar fuel production in recent *** achieve sustainable green H_(2) production,it is essential to create efficient catalyst materials that are low-cost and can replace expensive noble metal-based *** characteristics make them an ideal catalyst material for the ***-dimensional mXenes with m_(n+1)X_(n) structure have been identified as a promising option for EC and PEC water splitting due to their superior hydrophilicity,metal-like conductivity,large surface area,and adjustable surface ***,we present a summary of recent advancements in the synthesis and performance enhancement methods for mXene hybrid materials in hydrogen production through EC and PEC water ***,we examine the challenges and insights associated with the rational design of mXene-based hybrid materials to facilitate efficient water splitting for sustainable solar fuel production.

关键词： mXene Hybrid materials EC PEC HER OER Water splitting

Use of ^(137)Cs and ^(210)Pb_(ex) fallout radionuclides for spatial soil erosion and redistribution assessment on steeply sloping agricultural highlands

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Journal of mountain Science 2021年第11期18卷 2888-2899页

作者： Jung-Hwan YOON Young-nam kim Kye-Hoon kim m.B.KIRKHAm Hyuck Soo kim Jae E.YANG Kangwon Institute of Inclusive Technology Kangwon National UniversityChuncheon 24341Republic of Korea Department of Biological Environment Kangwon National UniversityChuncheon 24341Republic of Korea Institute of Agriculture and Life Science Gyeongsang National UniversityJinju 52828Republic of Korea Department of Environmental Horticulture University of SeoulSeoul 02504Republic of Korea Department of Agronomy Kansas State UniversityManhattanKS 66506-0110USA

The steeply sloping agricultural highlands in Korea have severe soil *** of both soil erosion and sedimentation in these highlands is necessary to make plans for soil-conservation measures,but it is not feasible using existing soil-erosion *** study measured the site-specific concentrations of ^(137)Cs and ^(210)Pb_(ex) on both a highland slope(33%slope)and a reference site(undisturbed flat area)to estimate soil erosion and *** use of the fallout radionuclide(FRN)method was evaluated to see if it is a suitable method for characterizing soil *** were compared with those obtained with the Universal Soil Loss Equation(USLE),which is an empirical model that estimates annual soil *** average concentrations of ^(137)Cs and ^(210)Pb_(ex) at the reference site were 11.57±0.24 Bq kg^(-1) and 59.74±4.2 Bq kg^(-1),*** of ^(137)Cs and ^(210)Pb_(ex) in the experimental slope were 16.4%and 10.8%,respectively,of those at the reference *** inventories were lower at the upper point of the slope than those at the basal point of the *** of ^(137)Cs and ^(210)Pb_(ex) were significantly correlated with available phosphorus,organic matter,CEC,and exchangeable *** of soil redistribution rate using ^(137)Cs and ^(210)Pb_(ex) showed site-specific variations at different points along the slope,and respective ranges were^(-1)7.46~-207.51 and 1.55~-581.38 mgha^(-1) yr^(-1),which indicated that more erosion was assessed by ^(210)Pb_(ex) than by ^(137)*** analysis showed that soil erosion occurred along the entire slope,except for the bottom point of the slope where 1.55 mgha^(-1) yr^(-1) of sediment *** USLE provided a single value of the average annual soil loss in the entire slope,which was either 166 or 398 mgha^(-1) yr^(-1),depending on the soil erodibility factor(soil series factor and calculated factor from soil sample analysis)used in t

关键词： Soil erosion Steep highland Fallout radionuclide ^(137)Cs ^(210)Pb_(ex) USLE

Embedded Surfaces for Symplectic Circle Actions

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Chinese Annals of mathematics,Series B 2017年第6期38卷 1197-1212页

作者： Yunhyung CHO min kyu kim Dong Youp SUH Department of mathematics Education Sungkyunkwan UniversitySeoulRepublic of Korea. Department of mathematics Education Gyeongin National University of EducationSan 59-12Gyesan-dongGyeyang-guIncheon 407-753Republic of Korea. Department of IVIathematieal Sciences KAIST335 GwahangnoYu-sung GuDaejeon 305-701Republic of Korea.

The purpose of this article is to characterize symplectic and Hamiltonian circle actions on symplectic manifolds in terms of symplectic embeddings of Riemann *** precisely, it is shown that(1) if(m, ω) admits a Hamiltonian S^1-action, then there exists a two-sphere S in m with positive symplectic area satisfying c1(m, ω), [S] > 0,and(2) if the action is non-Hamiltonian, then there exists an S^1-invariant symplectic2-torus T in(m, ω) such that c1(m, ω), [T] = 0. As applications, the authors give a very simple proof of the following well-known theorem which was proved by Atiyah-Bott,Lupton-Oprea, and Ono: Suppose that(m, ω) is a smooth closed symplectic manifold satisfying c1(m, ω) = λ· [ω] for some λ∈ R and G is a compact connected Lie group acting effectively on m preserving ω. Then(1) if λ must be trivial,(2) if λ = 0, then the G-action is non-Hamiltonian, and(3) if λ > 0, then the G-action is Hamiltonian.

关键词： Symplectic geometry Hamiltonian action

Impregnation approach for poly(vinylidene fluoride)/tin oxide nanotube composites with high tribological performance

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Journal of materials Science & Technology 2020年第2期37卷 19-25页

作者： min Su Park Jin kyu kim Tong-Seok Han Jung Tae Park Jong Hak kim Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul03722Korea Department of Civil and Environmental Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul03722Korea Department of Chemical Engineering Konkuk University120 Neungdong-roGwangjin-guSeoul05029Korea

We report a composite material with the high tribological performance,which consists of onedimensional SnO2 nanotubes(ST)and a high molecular weight poly(vinylidene fluoride)(PVDF)matrix in terms of *** of PVDF in N,N-dimethylformamide(DmF)resulted in a facile penetration of PVDF into the inner hollow voids of ST,leading to the close *** between PVDF and ST results in a beneficial effect on the chain arrangement of PVDF,providing anα-phase with better tribological *** ST incorporation,the friction coefficient decreased by 85.0%to 0.408,and the specific wear rate decreased by 69.1%to 0.412,demonstrating the pivotal role of ST as a self-lubricating material due to a large interactive area and PVDF chain rearrangement.

关键词： SnO2 nanotube Composite Friction coefficient Wear rate

2.47 GPa grade ultra-strong 15Co-12Ni secondary hardening steel with superior ductility and fracture toughness

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Journal of materials Science & Technology 2021年第7期66卷 36-45页

作者： Young-kyun kim kyu-Sik kim Young-Beum Song Jung Hyo Park Kee-Ahn Lee Department of materials Science and Engineering Inha UniversityIncheon22212Republic of Korea Agency for Defense Development(ADD) Yuseong-guDaegeon34186Republic of Korea

This study investigated the effect of multi-step heat treatment on the microstructure, mechanical properties and fracture behavior of thick 15 Co-12 Ni secondary hardening steel. As-quenched sample was found to have elongated prior austenite grain(PAG) and coarse lenticular martensitic structure. On the other hand, heat-treated sample was observed to have fine lenticular martensitic structure due to fine PAG size and a lot of nano-sized carbides. Also, after heat treatment, nano-scale reverted austenite film was formed at the martensite interfaces. The heat-treated sample showed 2.47 GPa superior tensile strength and superior elongation of about 12 %. The high strength was mainly due to fine block size and high number density of nano-sized carbides. The average value of plane strain fracture toughness(KIC) was 29.3 mPa m1/2, which indicated a good fracture toughness even with the high tensile strength. The tensile fracture surface was observed to have ductile fracture mode(cup-and-cone) and the formation of about ~1 μm ultra-fine dimples. In addition to this, nano-sized carbides were observed within the *** findings suggested that the nano-sized carbide had a positive effect not only on the strength but also on the ductility of the alloy. The fractured surface after toughness test, also showed ductile fracture mode with a lot of dimples. Based on the above results, correlation among microstructural evolution,deformation and fracture mechanisms along the heat-treatment was also discussed.

关键词： Ultra-high strength High Co-Ni secondary hardening steel microstructure Tensile properties Fracture toughness Reverted austenite

Ni, Co-double hydroxide wire structures with controllable voids for electrodes of energy-storage devices

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Journal of materials Science & Technology 2020年第20期52卷 126-135页

作者： Jin kyu kim Chang Soo Lee Jae Hun Lee Jung Tae Park Jong Hak kim Department of Chemical and Biomolecular Engineering Yonsei University50 Yonsei-roSeodaemun-guSeoul 03722Republic of Korea Department of Chemical Engineering Konkuk University120 Neungdong-roGwangjin-guSeoul 05029Republic of Korea

We re port the facile synthesis of Ni,Co-double hydroxide wire(NCHW)-based electrodes directly grown on a conductive substrate via a hydrothermal *** NCHW nanostructures were grown on Ni foam,and the growth was controlled using different compositions of solvents(ethanol and water).With increasing volume ratio of ethanol to water,the density of the wires decreased,and the spatial voids between the wires *** formation of large empty spaces improved the electrochemical performance because the exposure of a large surface area of the structure to the electrolyte resulted in a large number of active sites and facile electrolyte penetration into the *** different NCHW structures were ascribed to the pivotal role of the solvent in the urea hydrolysis;the solvent triggered the formation of hydroxides during the hydrothermal *** electrochemical performance of the NCHW electrodes was investigated via galvanostatic charge/discha rge tests,cyclic voltammetry,and electrochemical impedance *** highest specific capacitance was 1694.7 m F/cm^2 at 2 mA/cm^2,with excellent capacitance retention of 81.5% after 5000 *** superior electrochemical performance of the NCHW electrodes is attributed to the large number of active sites and facile electrolyte diffusion into the structure,due to the well-organized structure with an optimized density of nanowires and large voids between the wires.

关键词： Ni,Co-double hydroxide Nanowire Electrode Energy-storage device Supercapacitor