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Experimental Status of the hANbIT Facility

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Plasma Science and Technology 2004年第4期6卷 2367-2370页

作者： S.j.Yoo M.Kwon j.G.bak K.Choh I.S.Choi j.h.Choi j.W.Choi A.C.England j.hong h.S.jeon h.G.jhang j.S.ju M.jung j.Y.Kim S.S.Kim W.h.Ko K.Y.Kwak M.C.Kyum b.j.lee d.K.lee j.h.lee h.G.lee S.G.lee T.Lho h.K.Na b.h.park M.K.park d.C.Seo S.h.Seo j.h.Yeom j.S.Yoon K.I.You Korea basic Science Institute Daejeon305-333Korea hanbit User Group

hANbIT is a magnetic mirror confinement device. Recent physics experimentshave been mainly focused on identifying discharge characteristics and on getting stable plasmaproduction and operation modes, by using a 500 kW slot antenna system at a fixed RF frequency of 3.5Mhz and varying discharge conditions such as fueling rate, RF power, and b-field intensity incentral cell. Two distinct operation modes are found to be very sensitive to the RF power as well asthe ratio of the RF frequency to the ion cyclotron frequency. A Mhd interchange mode of m = - 1 isclearly observed and the stabilizing mechanism can be explained by the sideband coupling theory.

关键词： mirror discharge stabilization

Leader-following consensus criteria for multi-agent systems with time-varying delays and switching interconnection topologies

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Chinese Physics b 2012年第11期21卷 144-153页

作者： M.j.park O.M.Kwon ju h.park S.M.lee E.j.Cha School of Electrical Engineering Chungbuk National University department of Electrical Engineering Yeungnam University School of Electronic Engineering Daegu University department of biomedical Engineering School of MedicineChungbuk National University

We consider multi-agent systems with time-varying delays and switching interconnection topologies. by con- structing a suitable Lyapunov-Krasovskii functional and using the reciprocally convex approach, new delay-dependent consensus criteria for the systems are established in terms of linear matrix inequalities （LMIs）, which can be easily solved by using various effective optimization algorithms. Two numerical examples are given to illustrate the effectiveness of the proposed methods.

关键词： consensus multi-agent systems time delay Lyapunov method

h∞ synchronization of chaotic neural networks with time-varying delays

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Chinese Physics b 2013年第11期22卷 244-252页

作者： O. M. Kwon M. j. park ju h. park S. M. lee E. j. Cha School of Electrical Engineering Chungbuk National University department of Electrical Engineering Yeungnam University School of Electronic Engineering Daegu University department of biomedical Engineering School of Medicine Chungbuk National University

In this paper, we investigate the problem of h∞ synchronization for chaotic neural networks with time-varying delays. A new model of the networks with disturbances in both master and slave systems is presented. by constructing a suitable Lyapunov–Krasovskii functional and using a reciprocally convex approach, a novel h∞ synchronization criterion for the networks concerned is established in terms of linear matrix inequalities （LMIs） which can be easily solved by various effective optimization algorithms. Two numerical examples are given to illustrate the effectiveness of the proposed method.

关键词： chaotic neural networks time-varying delays h∞ synchronization Lyapunov method

Customized 3d-printed occluders enabling the reproduction of consistent and stable heart failure in swine models

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bio-design and Manufacturing 2021年第4期4卷 833-841页

作者： han b.Kim Seungman jung hyukjin park doo S.Sim Munki Kim Sanskrita das Youngkeun Ahn Myung h.jeong jinah jang Young j.hong division of Cardiology Chonnam National University Medical SchoolGwangjuRepublic of Korea School of Interdisciplinary bioscience and bioengineering Pohang University of Science and TechnologyPohangRepublic of Korea department of Creative IT Engineering Pohang University of Science and TechnologyPohangRepublic of Korea department of Mechanical Engineering Pohang University of Science and TechnologyPohangRepublic of Korea

Reproducibility of clinical output is important when investigating therapeutic efficacy in pre-clinical animal *** to its physiological relevance,a swine myocardial infarction(MI)model has been widely used to evaluate the effectiveness of stem cells or tissue-engineered constructs for ischemic heart *** methods are used to induce MI in the swine ***,it is difficult,using these approaches,to obtain a similar level of functional outcomes from a group of animals due to interpersonal variation,leading to increased experimental ***,in order to minimize human intervention,we developed an approach to use a customized occluder that has dimensional similarities with that of the coronary artery of animals in the case of the swine *** carried out angiography to measure the diameter of the middle left anterior descending artery of each individual animal to fabricate the customized occluder using a 3d-printing *** fabricated occluder contained a central hole smaller than that of the targeted middle left anterior descending artery to mimic an atherosclerotic coronary artery that has an approximately 20%blocked ***,the 3d-printed occluder can provide continuous blood flow through the central pore,indicating a high survival rate(88%)of up to 28 days *** method showed the possibility of creating consistent myocardial infarction induction as compared to the conventional representative closed-chest method(50%survival rate),thus highlighting how our method can have a profound effect on accelerating reliable experiments for developing new therapeutic approaches to ischemic heart diseases.

关键词： 3d bioprinting Myocardial infarction Ischemic heart failure Swine model Left anterior descending artery

Optimally arranged TiO_(2)@MoS_(2) heterostructures with effectively induced built-in electric field for high-performance lithium-sulfur batteries

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journal of Energy Chemistry 2023年第8期83卷 496-508,I0012页

作者： jeongyoub lee Changhoon Choi jung been park Seungho Yu jinho ha hyungsoo lee Gyumin jang Young Sun park juwon Yun hayoung Im Subin Moon Soobin lee jung-Il Choi dong-Wan Kim jooho Moon department of Materials Science and Engineering Yonsei UniversitySeoul 03722Republic of Korea School of Civil Environmental and Architectural EngineeringKorea UniversitySeoul 02841Republic of Korea Energy Storage Research Center Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea School of Mathematics and Computing(Computational Science and Engineering) Yonsei UniversitySeoul 03722Republic of Korea

To overcome the serious technological issues affecting lithium-sulfur(Li-S) batteries,such as sluggish sulfur redox kinetics and the detrimental shuttle effect,heterostructure engineering has been investigated as a strategy to effectively capture soluble lithium polysulfide intermediates and promote their conversion reaction by integrating highly polar metal oxides with catalytically active metals ***,to fully exploit the outstanding properties of heterostructure-based composites,their detailed structure and interfacial contacts should be designed ***,optimally arranged TiO_(2)and MoS_(2)-based heterostructures(TiO_(2)@MoS_(2)) are fabricated on carbon cloth as a multifunctional interlayer to efficiently trap polysulfide intermediates and accelerate their redox *** to the synergistic effects between TiO_(2)and MoS_(2)and the uniform heterointerface distribution that induces the ideally oriented built-in electric field,Li-S batteries with TiO_(2)@MoS_(2)interlayers exhibit high rate capability(601 mA h g^(-1)at 5 C),good cycling stability(capacity-fade rate of 0.067% per cycle over 500 cycles at2 C),and satisfactory areal capacity(5.2 mA h cm^(-2)) under an increased sulfur loading of 5.2 mg cm^(-2).Moreover,by comparing with a MoS_(2)@TiO_(2)interlayer composed of reversely arranged heterostructures,the effect of the built-in electric field’s direction on the electrocatalytic reactions of polysulfide intermediates is thoroughly investigated for the first *** superior electrocatalytic activities of the rationally arranged TiO_(2)@MoS_(2)interlayer demonstrate the importance of optimizing the built-in electric field of heterostructures for producing high-performance Li-S batteries.

关键词： Lithium-sulfur batteries Shuttle effect TiO_(2)-MoS_(2)heterostructure engineering built-in electric field Multifunctional interlayers

Present Status of the KSTAR Superconducting Magnet System development

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Plasma Science and Technology 2004年第5期6卷 2445-2450页

作者： Keeman Kim h.K.park K.R.park b.S.Lim S.I.lee M.K.Kim Y.Chu W.h.Chung S.h.baek j.Y.Cho h.Yonekawa A.Chertovskikh Y.b.Chang j.S.Kim C.S.Kim d.j.Kim N.h.Song K.P.Kim Y.j.Song I.S.Woo W.S.han d.K.lee Y.K.Oh K.W.Cho j.S.park G.S.lee h.j.lee T.K.Ko S.j.lee National NationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalNationalKorea Atomic Energy Research InstituteDaejeonRepublic of KoreaYonsei UniversitySeoulRepublic of KoreaYonsei UniversitySeoulRepublic of Korea Fusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science InstituteDaejeonRepublic of KoreaFusion R&D CenterKorea Basic Science

The mission of Korea Superconducting Tokamak Advanced Research (KSTAR)project is to develop an advanced steady-state superconducting tokamak for establishing a scientificand technological basis for an attractive fusion reactor. because one of the KSTAR mission is toachieve a steady-state operation, the use of superconducting coils is an obvious choice for themagnet system. The KSTAR superconducting magnet system consists of 16 Toroidal Field (TF) coils and14 Poloidal Field (PF) coils. Internally-cooled Cable-In-Conduit Conductors (CICC) are put into usein both the TF and PF coil systems. The TF coil system provides a field of 3.5 T at the plasmacenter and the PF coil system is able to provide a flux swing of 17 V-sec. The major achievement inKSTAR magnet-system development includes the development of CICC, the development of a full-size TFmodel coil, the development of a coil system for background magnetic-field generation , theconstruction of a large-scale superconducting magnet and CICC test facility. TF and PF coils are inthe stage of fabrication to pave the way for the scheduled completion of KSTAR by the end of 2006.

关键词： superconducting magnet KSTAR CICC

Intrinsic electrochemical activity of Ni in Ni_(3)Sn_(4) anode accommodating high capacity and mechanical stability for fast-charging lithium-ion batteries

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journal of Energy Chemistry 2022年第8期31卷 470-477,I0013页

作者： janghyuk Moon Trung dinh hoang Seong Soo park Seowan park dong Young Rhee junwon lee Sang A han Min-Sik park jung ho Kim School of Energy Systems Engineering Chung-Ang UniversityHeukseok-RoDongjak-guSeoul 06974Republic of Korea department of Advanced Materials Engineering for Information and Electronics Integrated Education Institute for Frontier Science&Technology(BK21 Four)Kyung Hee University1732 Deogyeong-daeroGiheung-guYongin 17104Republic of Korea Institute for Superconducting&Electronic Materials(ISEM) Australian Institute of Innovative Materials(AIIM)University of WollongongInnovation CampusSquires WayNorth WollongongNSW 2500Australia

Fast interfacial kinetics derived from bicontinuous three-dimensional(3d)architecture is a strategic feature for achieving fast-charging lithium-ion batteries(LIbs).One of the main reasons is its large active surface and short diffusion ***,understanding of unusual electrochemical properties still remain great challenge due to its *** this study,we proposed a nickel–tin compound(Ni_(3)Sn_(4))supported by 3d Nickel scaffolds as main frame because the Ni_(3)Sn_(4) clearly offers a higher reversible capacity and stable cycling performance than bare tin(Sn).In order to verify the role of Ni,atomic-scale simulation based on density functional theory systematically addressed to the reaction mechanism and structural evolution of Ni_(3)Sn_(4) during the lithiation *** findings are that Ni enables Ni_(3)Sn_(4) to possess higher mechanical stability in terms of reactive flow stress,subsequently lead to improve Li storage *** study elucidates an understanding of the lithiation mechanism of Ni_(3)Sn_(4) and provides a new perspective for the design of high-capacity and high-power 3d anodes for fast-charging LIbs.

关键词： Lithium-ion batteries Ni_(3)Sn_(4) high-capacity anode 3d-structured electrode Inverse opal structure density functional theory

Effects of irradiation on superconducting properties of small-grained Mgb_(2) thin films

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Chinese Physics b 2023年第12期32卷 534-540页

作者：刘丽 jung Min lee Yoonseok han jaegu Song Chorong Kim jaekwon Suk Won Nam Kang 刘杰 Soon-Gil jung Tuson park Center for Quantum Materials and Superconductivity(CQMS) Sungkyunkwan UniversitySuwon 16419Republic of Korea department of Physics Sungkyunkwan UniversitySuwon 16419Republic of Korea Institute of Modern Physics Chinese Academy of Sciences(CAS)Lanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of Sciences(UCAS)Beijing 100049China Korea Multi-purpose Accelerator Complex Korea Atomic Energy Research InstituteGyeongjuGyeongbuk 38180Republic of Korea department of Physics Education Sunchon National UniversitySuncheon 57922Republic of Korea

We investigate the effect of ion irradiation on Mgb_(2) thin films with small grains of approximately 122 nm and 140 *** flux pinning by grain boundaries is insignificant in the pristine Mgb_(2) films due to good inter-grain connectivity,but is significantly improved after 120-keV Mn-ion *** scaling behavior of the flux pinning force density for the ion-irradiated Mgb_(2) thin films with nanoscale grains demonstrates the predominance of pinning by grain boundaries,in contrast to the single-crystalline Mgb_(2) films where normal point pinning was dominant after low-energy ion *** results suggest that irradiation-induced defects can accumulate near the grain boundaries in metallic Mgb_(2) superconductors.

关键词： Mgb_(2)films grain boundaries flux pinning low-energy ion irradiation

Materials and extracellular matrix rigidity highlighted in tissue damages and diseases:Implication for biomaterials design and therapeutic targets

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bioactive Materials 2023年第2期20卷 381-403页

作者： jae hee park Seung bin jo jung-hwan lee hae-hyoung lee jonathan CKnowles hae-Won Kim Institute of Tissue Regeneration Engineering(ITREN) Dankook UniversityCheonan31116Republic of Korea department of Nanobiomedical Science and bK21 NbM Global Research Center for Regenerative Medicine Dankook UniversityCheonan31116Republic of Korea department of biomaterials Science College of DentistryDankook UniversityCheonan31116Republic of Korea Cell&Matter Institute Dankook UniversityCheonan31116Republic of Korea Mechanobiology dental Medicine Research Center Dankook UniversityCheonan31116Republic of Korea UCL Eastman-Korea dental Medicine Innovation Centre Dankook UniversityCheonan31116Republic of Korea division of biomaterials and Tissue Engineering UCL Eastman Dental InstituteUniversity College LondonRoyal Free HospitalRowland Hill StreetLondonNW32PFUnited Kingdom

Rigidity(or stiffness)of materials and extracellular matrix has proven to be one of the most significant extracellular physicochemical cues that can control diverse cell behaviors,such as contractility,motility,and spreading,and the resultant pathophysiological *** 2d materials engineered with tunable rigidity have enabled researchers to elucidate the roles of matrix biophysical cues in diverse cellular events,including migration,lineage specification,and mechanical ***,the recent findings accumulated under 3d environments with viscoelastic and remodeling properties pointed to the importance of dynamically changing rigidity in cell fate control,tissue repair,and disease ***,here we aim to highlight the works related with material/matrix-rigidity-mediated cell and tissue behaviors,with a brief outlook into the studies on the effects of material/matrix rigidity on cell behaviors in 2d systems,further discussion of the events and considerations in tissue-mimicking 3d conditions,and then examination of the in vivo findings that concern material/matrix *** current discussion will help understand the material/matrix-rigidity-mediated biological phenomena and further leverage the concepts to find therapeutic targets and to design implantable materials for the treatment of damaged and diseased tissues.

关键词： Matrix rigidity biophysical cue Cell and tissue engineering 3d biomaterials conditions Therapeutic targets