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Superconducting joints using reacted multifilament MgB_(2)wires:A technology toward cryogen-free MRI magnets

Journal of Magnesium and Alloys 2024年第1期12卷 159-170页

作者： Dipak Patel Akiyoshi Matsumoto Hiroaki Kumakura Yuka Hara Toru Hara Minoru Maeda Hao Liang Yusuke Yamauchi Seyong Choi jung ho kim Md Shahriar A.hossain School of Mechanical and Mining Engineering The University of QueenslandSt LuciaQueensland 4072Australia National Institute for Materials Science(NIMS) 1-2-1 SengenTsukubaIbaraki 305-0047Japan Department of Electrical Engineering and Kangwon High Magnetic Field Center Institute of Quantum Convergence TechnologyKangwon National UniversityGangwon 24341Republic of Korea Australian Institute for Bioengineering and Nanotechnology(AIBN) The University of QueenslandSt LuciaQueensland 4072Australia Department of Materials Process Engineering Graduate School of EngineeringNagoya UniversityNagoyaAichi 464-8603Japan Institute for Superconducting and Electronic Materials Australian Institute for Innovative MaterialsUniversity of WollongongNorth WollongongNew South Wales 2500Australia

The development of superconducting joining technology for reacted magnesium diboride(MgB_(2))conductors remains a critical challenge for the advancement of cryogen-free MgB_(2)-based magnets for magnetic resonance imaging(MRI).Herein,the fabrication of superconducting joints using reacted carbon-doped multifilament MgB_(2)wires for MRI magnets is *** achieve successful superconducting joints,the powder-in-mold method was employed,which involved tuning the filament protection mechanism,the powder compaction pressure,and the heat treatment *** fabricated joints demonstrated clear superconducting-to-normal transitions in self-field,with effective magnetic field screening up to 0.5 T at 20 *** evaluate the interface between one of the MgB_(2)filaments and the MgB_(2)bulk within the joint,serial sectioning was conducted for the first time in this type of superconducting *** serial sectioning revealed space formation at the interface,potentially caused by the volume shrinkage associated with the MgB_(2)formation or the combined effect of the volume shrinkage and the different thermal expansion coefficients of the MgB_(2)bulk,the filament,the mold,and the sealing *** findings are expected to be pivotal in developing MgB_(2)superconducting joining technology for MRI magnet applications through interface engineering.

关键词： Mg B2 superconducting joint MgB_(2)conductor MRI applications Cryogen-free magnet Persistent-mode operation

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Molecular and prognostic heterogeneity of microsatellite-unstable colorectal cancer

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World Journal of Gastroenterology 2014年第15期20卷 4230-4243页

作者： jung ho kim Gyeong hoon Kang Department of Pathology SMG-SNU Boramae Medical CenterSeoul 156-707South Korea Department of Pathology Seoul National University College of MedicineSeoul 110-799South Korea Laboratory of Epigenetics Cancer Research InstituteSeoul National University College of MedicineSeoul 110-799South Korea

Colorectal cancers (CRCs) with a high level of microsatellite instability (MSI-H) are clinicopathologically distinct tumors characterized by predominance in females, proximal colonic localization, poor differentiation, mucinous histology, tumor-infiltrating lymphocytes, a Crohn’s-like lymphoid reaction and a favorable prognosis. In terms of their molecular features, MSI-H CRCs are heterogeneous tumors associated with various genetic and epigenetic alterations, including DNA mismatch repair deficiency, target microsatellite mutations, BRAF mutations, a CpG island methylator phenotype-high (CIMP-H) status, and a low level of genomic hypomethylation. The molecular heterogeneity of MSI-H CRCs also depends on ethnic differences; for example, in Eastern Asian countries, relatively low frequencies of CIMP-H and BRAF mutations have been observed in MSI-H CRCs compared to Western countries. Although the prognostic features of MSI-H CRCs include a favorable survival of patients and low benefit of adjuvant chemotherapy, there may be prognostic differences based on the molecular heterogeneity of MSI-H CRCs. Here, we have reviewed and discussed the molecular and prognostic features of MSI-H CRCs, as well as several putative prognostic or predictive molecular markers, including HSP110 expression, beta2-microglobulin mutations, myosin 1a expression, CDX2/CK20 expression, SMAD4 expression, CIMP status and LINE-1 methylation levels.

关键词： Colorectal cancer Microsatellite instability DNA mismatch repair DNA methylation CpG islands Prognosis Adjuvant chemotherapy

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Acute esophageal obstruction after ingestion of psyllium seed husk powder:A case report

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World Journal of Clinical Cases 2022年第7期10卷 2336-2340页

作者： Sujeong Shin jung ho kim You ho Mun Han Sol Chung Department of Emergency Medicine Yeungnam University School of Medicine and College of MedicineDaegu 42415South Korea

BACKGROUND Bezoar is a mass of hardened external material found in the gastrointestinal(GI)*** may form anywhere in the GI tract,but esophageal bezoar is rare because of the short esophageal transit *** seed husk is an indigestible natural derivative that is widely used as an herbal ***,we report a case of acute esophageal obstruction caused by a bezoar after ingestion of psyllium seed husk *** SUMMARY A 76-year-old male with Parkinson’s disease visited the emergency department with swallowing difficulty approximately 10 h after ingesting psyllium seed husk *** began a few hours after ingestion and progressed to severe *** were no abnormal findings on simple ***,a computed tomography scan revealed an approximately 2.0 cm×2.5 cm mass located near the gastro-esophageal *** grinding,the mass was removed using an endoscopic capture *** bezoars may cause life-threatening *** with Parkinson’s disease may have esophageal motility dysfunction,which may increase esophageal transit *** our patient had Parkinson’s disease,this effect may have contributed to the formation of the *** Attention should be paid to using bulk-laxatives,and an appropriate specified regimen will be needed when marketed as a dietary supplement.

关键词： Bezoar Esophagus Obstruction Parkinson’s disease Psyllium Case report

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Intramedullary spinal cord metastasis from pancreatic neuroendocrine tumor

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World Journal of Gastroenterology 2014年第38期20卷 14063-14067页

作者： jung ho kim Chang Lim Hyun Sang hoon Han Department of Internal Medicine Gachon University Gil Medical Center Department of Pathology Jeju National University School of Medicine Department of Internal Medicine Jeju National University School of Medicine

Intramedullary spinal cord metastasis(ISCM) is very rare and its optimal treatment remains controversial. Pancreatic neuroendocrine tumor(pNET) is a rare tumor that usually presents with hepatic metastasis. Hepatic failure due to tumor progression is the major cause of death in cases of pNET. To date,no report has described a case of ISCM from pNET. Although spinal cord metastasis of a solid tumor is uncommon,it is a critical condition that can cause a potentially irreversible loss of neurologic function. Here,we report the case of a 45-year-old man who presented with leg weakness and voiding difficulty,and was found to have ISCM from pNET. Surgical treatment prevented further neurological deterioration. This is the first case report of ISCM from pNET.

关键词： Intramedullary Spinal cord neoplasm Metastasis Neuroendocrine tumor Pancreas

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Long-lasting,reinforced electrical networking in a high-loading Li_(2)S cathode for high-performance lithium–sulfur batteries

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Carbon Energy 2023年第8期5卷 1-14页

作者： Hun kim Kyeong-Jun Min Sangin Bang Jang-Yeon Hwang jung ho kim Chong SYoon Yang-Kook Sun Department of Energy Engineering Hanyang UniversitySeoulRepublic of Korea Department of Materials Science and Engineering Chonnam National UniversityGwangjuRepublic of Korea Institute for Superconducting&Electronic Materials(ISEM) Australian Institute of Innovative Materials(AIIM)University of WollongongNew South WalesNorth WollongongAustralia Department of Materials Science and Engineering Hanyang UniversitySeoulRepublic of Korea

Realizing a lithium sulfide(Li_(2)S)cathode with both high energy density and a long lifespan requires an innovative cathode design that maximizes electrochemical performance and resists electrode ***,a high-loading Li_(2)S-based cathode with micrometric Li_(2)S particles composed of two-dimensional graphene(Gr)and one-dimensional carbon nanotubes(CNTs)in a compact geometry is developed,and the role of CNTs in stable cycling of high-capacity Li–S batteries is *** a dimensionally combined carbon matrix,CNTs embedded within the Gr sheets create robust and sustainable electron diffusion pathways while suppressing the passivation of the active carbon *** a unique point,during the first charging process,the proposed cathode is fully activated through the direct conversion of Li_(2)S into S_(8) without inducing lithium polysulfide *** direct conversion of Li_(2)S into S_(8) in the composite cathode is ubiquitously investigated using the combined study of in situ Raman spectroscopy,in situ optical microscopy,and cryogenic transmission electron *** composite cathode demonstrates unprecedented electrochemical properties even with a high Li_(2)S loading of 10 mg cm^(–2);in particular,the practical and safe Li–S full cell coupled with a graphite anode shows ultra-long-term cycling stability over 800 cycles.

关键词： carbon nanotubes electrical network high energy high loading Li_(2)S cathode lithium-sulfur batteries

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Robust superhydrophobicity of hierarchical ZnO hollow microspheres fabricated by two-step self-assembly

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Nano Research 2013年第10期6卷 726-735页

作者： Ziqi Sun Ting Liao Kesong Liu Lei Jiang jung ho kim Shi Xue Dou Institute for Superconducting and Electronic Materials University of Wollongong Innovation Campus North Wollongong NSW 2500 Australia Australian Institute for Bioengineering and Nanotechnology the University of Queensland St Lucia QLD 4072 Australia Key Laboratory of Bio-inspired Smart Interracial Science and Technology of Ministry of Education School of Chemistry and Environment Beijing University of Aeronautics &Astronautics Beijing 100191 China Beijing National Laboratory for Molecular Sciences Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 China

Superhydrophobic and superhydrophilic surfaces have been extensively inves- tigated due to their importance for industrial applications. It has been reported, however, that superhydrophobic surfaces are very sensitive to heat, ultraviolet （UV） light, and electric potential, which interfere with their long-term durability. In this study, we introduce a novel approach to achieve robust superhydrophobic thin films by designing architecture-defined complex nanostructures. A family of ZnO hollow microspheres with controlled constituent architectures in the morphologies of 1D nanowire networks, 2D nanosheet stacks, and 3D mesoporous nanoball blocks, respectively, was synthesized via a two-step self-assembly approach, where the oligomers or the constituent nanostructures with specially designed structures are first formed from surfactant templates, and then further assembled into complex morphologies by the addition of a second co-surfactant. The thin films composed of two-step synthesized ZnO hollow microspheres with different architectures presented superhydrophobicities with contact angles of 150°-155°, superior to the contact angle of 103° for one-step synthesized ZnO hollow microspheres with smooth and solid surfaces. Moreover, the robust superhydrophobicity was further improved by perfluorinated silane surface modification. The perfluorinated silane treated ZnO hollow microsphere thin films maintained excellent hydrophobicity even after 75 h of UV irradiation. The realization of environmentally durable promising solution for their long-term irradiations. superhydrophobic surfaces provides a service under UV or strong solar light

关键词： ZnO hierarchical structure two-step self-assembly nanomaterials robustsuperhydrophobicity

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In-situ formation of MOF derived mesoporous Co3N/amorphous N-doped carbon nanocubes as an efficient electrocatalytic oxygen evolution reaction

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Nano Research 2019年第7期12卷 1605-1611页

作者： Bong Kyun Kang Seo Young Im Jooyoung Lee Sung hoon Kwag Seok Bin Kwon SintayehuNibret Tiruneh Min-Jun kim jung ho kim Woo Seok Yang Byungkwon Lim Dae ho Yoon Nano Materials and Components Research Center Korea Electronics Technology InstituteSeongnam 463-816Republic of Korea School of Advanced Materials Science and Engineering Sungkyunkwan University Suwon 440-746Republic of Korea Advanced Materials & Processing Center Institute for Advanced Engineering (IAE)Yongin 175-28Republic of Korea Australian Institute for Innovative Materials (AIIM) University of WollongongSquires WayNorth Wollongong NSW 2500Australia Department of Advanced Materials Engineering for Information and Electronics Kyung Hee University1732 Deogyeong-daeroGiheung-guYongin-siGyeonggi-do17104Republic of Korea

The suitable materials,metal nitrides,are a promising class of electrocatalyst materials for a highly efficient oxygen evolution reaction (OER) because they exhibit superior intrinsic conductivity and have higher sustainability than oxide-based *** our knowledge,for the first time,we report a designable synthesis of three-dimensional (3D) and mesoporous Co3N@ amorphous N-doped carbon (AN-C) nanocubes (NCs) with well-controlled open-framework structures via monodispersed Co3[Co(CN)6]2 Prussian blue analogue (PBA) NC precursors using in situ nitridation and calcination ***3N@AN-C NCs (2 h) demonstrate better OER activity with a remarkably low Tafel plot (69.6 mV-dec-1),low overpotential of 280 mV at a current density of 10 ***,excellent cycling stability in alkaline electrolytes was exhibited without morphological changes and voltage elevations,superior to most reported hierarchical structures of transition-metal nitride *** presented strategy for synergy effects of metal-organic frameworks (MOFs)-derived transition-metal nitrides-carbon hybrid nanostructures provides prospects for developing high-performance and advanced electrocatalyst materials.

关键词： transition-metal nitride metal organic framework mesoporous oxygen evaluation reaction alkaline water electrolysis

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Epidemiology and risk factors for sports-and recreation-related eye injury:a multicenter prospective observational study

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International Journal of Ophthalmology(English edition) 2021年第1期14卷 133-140页

作者： Dong Eun Lee Hyun Wook Ryoo Sungbae Moon Jae Yun Ahn jung ho kim Jong-Yeon kim Department of Emergency Medicine Kyungpook National University Chilgok HospitalSchool of MedicineKyungpook National UniversityDaegu 41944Republic of Korea Department of Emergency Medicine Kyungpook National University HospitalSchool of MedicineKyungpook National UniversityDaegu 41944Republic of Korea Department of Emergency Medicine Yeungnam University College of MedicineDaegu 42415Republic of Korea Department of Public Health Kyungpook National University HospitalDaegu 41944Republic of Korea

AIM:To identify the epidemiologic characteristics of sportsand recreation-related eye injuries in a large metropolitan city and investigate risk factors associated with visual ***:We performed a multicenter prospective observational study on patients using the regional eye injury registry *** study included patients with sportsand recreation-related eye injury in four tertiary teaching hospitals in Daegu,Republic of Korea,from August 2016 to July *** primary outcome was visual impairment at the first hospital *** of sex,age,place,and causative materials were analyzed according to causative *** examine the association between causative activities and visual impairment,a Logistic regression analysis was ***:Of the 349 sports-and recreation-related eye injuries,soccer was the most common causative activity,with 21.8%(n=76).Sports-and recreation-related eye injuries occurred mainly in teenagers,individuals in their 20 s,and *** and soccer were significantly associated with visual impairment at the first hospital visit compared with combat sports[(adjusted odds ratio(AOR),5.18;95%confidence interval(CI),1.67-16.09 for badminton and AOR,3.87;95%CI,1.36-10.99 for soccer].CONCLUSION:Intervention efforts such as deployment of protective eyewear in sports facilities and schools and promotion of wearing protective eyewear during these activities in teenagers and individuals in their 20 s are mandatory.

关键词： epidemiology eye injury sports injury prevention

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Controlled Ag-driven superior rate-capability of Li4Ti5O12 anodes for lithium rechargeable batteries

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Nano Research 2013年第5期6卷 365-372页

作者： Jae-Geun kim Dongqi Shi Min-Sik Park Goojin Jeong Yoon-Uk Heo Minsu Seo Young-Jun kim jung ho kim Shi Xue Dou Institute for Superconducting and Electronic Materials University of Wollongong North Wollongong NSW2500 Australia Advanced Batteries Research Center Korea Electronics Technology Institute Seongnam 463-816 Republic of Korea Research Facility Center Graduate Institute of Ferrous Technology Pohang University of Science and Technology Pohang 790-784 Republic of Korea

The morphology and electronic structure of a Li4Ti5012 anode are known to determine its electrical and electrochemical properties in lithium rechargeable batteries. Ag-Li4Ti5012 nanofibers have been rationally designed and synthesized by an electrospinning technique to meet the requirements of one-dimensional （1D） morphology and superior electrical conductivity. Herein, we have found that the 1D Ag-Li4Ti5012 nanofibers show enhanced specific capacity, rate capability, and cycling stability compared to bare Li4Ti5012 nanofibers, due to the Ag nanoparticles （〈5 nm）, which are mainly distributed at interfaces between Li4Ti5O12 primary particles. This structural morphology gives rise to 20% higher rate capability than bare Li4Ti5O12 nanofibers by facilitating the charge transfer kinetics. Our findings provide an effective way to improve the electrochemical performance of Li4Ti5O12 anodes for lithium rechargeable batteries.

关键词： spinel Li4Ti5012 (LTO) electrospinning silver doping lithium rechargeablebatteries 1D nanostructure

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Comparison of macular changes according to the etiology of optic neuritis:a cross-sectional study

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International Journal of Ophthalmology(English edition) 2024年第4期17卷 686-692页

作者： Yeji Moon Sung-Min kim Jae ho jung Department of Ophthalmology Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Republic of Korea Department of Neurology Seoul National University HospitalSeoul 03080Republic of Korea Department of Ophthalmology Seoul National University HospitalSeoul 03080Republic of Korea Department of Ophthalmology Seoul National University College of MedicineSeoul 03080Republic of Korea

AIM:To compare the macular structure including foveal thickness among patients with optic neuritis(ON)according to the etiology and to investigate the possible correlation between structural and visual outcomes METhoDS:In this retrospective cross-sectional study,the clinical data of patients with aquaporin-4 immunoglobulin G-related ON(AQP4 group,40 eyes),myelin oligodendrocyte glycoprotein IgG-related ON(MOG group,31 eyes),and multiple sclerosis-related ON(MS group,24 eyes)were *** retinal thickness of the foveal,parafoveal and perifoveal regions were *** acuity(VA),visual field index and mean deviation were measured as visual ***:The AQP4 group showed a significantly thinner fovea(226.4±13.4μm)relative to the MOG(236.8±14.0μm,P=0.015)and MS(238.9±14.3μm,P=0.007)*** thickness in the parafoveal area also was thinner in the AQP4 group,though the difference in perifoveal retinal thickness was not *** thickness was correlated with VA in the AQP4 group(coefficientρ=-0.418,P=0.014),but not in the MOG and MS groups(P=0.218 and P=0.138,respectively).There was no significant correlation between foveal thickness and visual field test in all three ***:The significant thinning in the fovea and parafoveal areas in the AQP4 group compared to the MOG and MS groups are ***,macular changes in AQP4-ON show a significant correlation with *** results provide the possibility that retinal structural damage could reflect functional damage in AQP4-ON,distinct from MOGON and MS-ON.

关键词： foveal thickness optic neuritis aquaporin-4 immunoglobulin myelin oligodendrocyte glycoprotein multiple sclerosis

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