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Luminescence characteristics of Dy^(3+) doped Gd_2O_3-CaO-SiO_2-B_2O_3 scintillating glasses

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Journal of Rare Earths 2016年第6期34卷 583-589页

作者： J.kaewkhao n.Wantana S.kaewjaeng S.kothan H.J.kim Center of Excellence in Glass Technology and Materials Science (CEGM) Nakhon Pathom Rajabhat University Department of Radiologic Technology Faculty of Associated Medical Sciences Chiang Mai University Department of Physics Kyungpook National University

Glasses were prepared from the compositions of 25Gd_2O_3-10 CaO-10 SiO_2-（55–x）B_2O_3-xDy_2O_3（where x is 0.0 mol.%–1.0 mol.%） by the conventional melt-quenching technique at 1400 oC. The results demonstrated the increase in the glass density with respect to the increase in the doping concentrations of Dy_2O_3. nine absorption bands were observed. The emission spectra of the developed glass showed two strong peaks at 577 nm（~4F_（9/2）→~6H_（13/2）） and 482 nm（~4F_（9/2）→~6H_（15/2））. The highest emission intensity was observed from the developed glass prepared at 0.4 mol.% of Dy_2O_3, as the efficient energy transfer took place from Gd^（3＋） to Dy^（3＋）. From the X-ray induced optical luminescence, the emission spectra were identical to those from PL measurements, but with the highest intensity observed from the glass quenched at 0.45 mol.% of Dy_2O_3. Finally, the integral scintillation efficiency of the developed glass was determined at 27% of that of the commercially available BGO crystal.

关键词： amorphous materials glasses oxides optical properties luminescence rare earths

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

Generalized Anxiety and Major Depressive Symptoms of General Public in South korea during the Early COVID-19 Pandemic

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International Journal of Mental Health Promotion 2021年第3期23卷 303-317页

作者： kye S.kim Peter M.kang He Sook n.kim Department of Medicine Beth Israel Deaconess Medical Center and Harvard Medical SchoolBostonMA 02215USA Department of Child&Family Studies Yonsei UniversitySeoul03722South Korea

The extent of viral spread and strategies in dealing with the COVID-19 pandemic have been different in each *** are overall increased mental health concerns in many countries but it is unclear what the general public individuals who do not have heighten vulnerability to stressors for existing mental diseases or significant physical illnesses were experiencing during the *** evaluated the stressors and mental health of general public in South korea that has a relatively low confirmed cases and *** on the on-line survey questions were used to assess the mental and physical symptoms in association with individuals’reported *** with the symptoms of the generalized anxiety disorder(GAD)were reported in 58.9%,and major depression(MD)in 23.2%,mostly in minimal to mild degrees,cut-off scores of 5 and 10,respectively by the validated screening tools,GAD-7 and *** GAD and MD symptoms were in 21.5%of the *** total number of stress had significant association with the scores of GAD-7,PHQ-9,physical symptoms,sleep difficulties and resilience(pnd raising young children(pn,and educational level(pns of the study include small sample size,usage of smartphone or email,potential under-reporting by stigma in the socio-cultural context and evolving nature of *** conclude that keeping careful watch for mental symptoms,stressors,sleep difficulties and other physical symptoms are important even for the individuals without previous mental illnesses during the pandemic era.

关键词： Generalized anxiety disorder symptoms major depression symptoms sleep difﬁculties physical symptoms pandemic stressors South korea generalized anxiety disorder-7(GAD-7) patient health questionnaire-9(PHQ-9)

Effect of Graphene nanoribbons (TexasPEG) on locomotor function recovery in a rat model of lumbar spinal cord transection

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neural Regeneration Research 2018年第8期13卷 1440-1446页

作者： C-Yoon kim William k. A. Sikkema Jin kim Jeong Ah kim James Walter Raymond Dieter Hyung-Min Chung Andrea Mana James M. Tour Sergio Canavero Department of Stem Cell Biology School of Medicine Konkuk University Seoul Korea Department of Laboratory Animal Medicine College of Veterinary Medicine Seoul National University Seoul Korea Department of Chemistry Department of Materials Science and NanoEngineering and The NanoCarbon Center Rice University Houston TXUSA Biomedical Omics Group Korea Basic Science Institute Cheongju-si Chungbuk Korea Research Service Hines Veterans Administration Hospital Hines IL USA HEAVEn/GEMInI International Collaborative Group Turin Italy

A sharply transected spinal cord has been shown to be fused under the accelerating influence of membrane fusogens such as polyethylene glycol （PEG）（GEMInI protocol）. Previous work provided evidence that this is in fact possible. Other fusogens might improve current results. In this study, we aimed to assess the effects of PEGylated graphene nanoribons （PEG-GnR, and called ＂TexasPEG＂ when prepared as lwt% dispersion in PEG600） versus placebo （saline） on locomotor function recovery and cellular level in a rat model of spinal cord transection at lumbar segment 1 （L1） level. In vivo and in vitro experiments （n -- 10 per experiment） were designed. In the in vivo experiment, all rats were submitted to full spinal cord transection at L1 level. Five weeks later, behavioral assessment was performed using the Basso Beattie Bresnahan （BBB） locomotor rating scale. Immunohistochemical staining with neuron marker neurofilament 200 （nF200） antibody and astrocyt- ic scar marker glial fibrillary acidic protein （GFAP） was also performed in the injured spinal cord. In the in vitro experiment, the effects of TexasPEG application for 72 hours on the neurite outgrowth of SH-SYSY cells were observed under the inverted microscope. Results of both in vivo and in vitro experiments suggest that TexasPEG reduces the formation of glial scars, promotes the regeneration of neurites, and thereby contributes to the recovery of locomotor function of a rat model of spinal cord transfection.

关键词： nerve regeneration spinal cord transfection spinal cord fusion GEMInI TexasPEG graphene nanoribbons

Clinical-based phenotypes in children with pediatric post-COVID-19 condition

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World Journal of Pediatrics 2024年第7期20卷 682-691页

作者： Lieke C.E.noij Jelle M.Blankestijn Coen R.Lap Marlies A.van Houten Giske Biesbroek Anke-Hilse Maitland-van der Zee Mahmoud I.Abdel-Aziz Johannes B.van Goudoever Mattijs W.Alsem Caroline L.H.Brackel kim J.Oostrom Simone Hashimoto Suzanne W.J.Terheggen-Lagro Department of Pediatric Pulmonology and Allergy Amsterdam UMCLocation AMCEmma Children’s HospitalAmsterdam University Medical CenterRoom G2-222Meibergdreef 91105AZAmsterdamThe Netherlands Department of Pulmonary Medicine Amsterdam UMCAmsterdamThe Netherlands Department of Pediatrics Spaarne GasthuisHoofddorpThe Netherlands Department of Pediatrics Emma Children’s HospitalAmsterdam University Medical CenterAmsterdamThe Netherlands Department of Rehabilitation Medicine Amsterdam Movement SciencesMeibergdreef 9AmsterdamThe Netherlands Department of Paediatric Pulmonology Department of PaediatricsTergooi MCHilversumThe Netherlands Department of Child and Adolescent Psychiatry and Psychosocial Care Amsterdam UMCAmsterdam Reproduction and DevelopmentAmsterdamThe Netherlands

Background Pediatric post coronavirus disease 2019(COVID-19)condition(PPCC)is a heterogeneous syndrome,which can significantly affect the daily lives of *** study aimed to identify clinically meaningful phenotypes in children with PPCC,to better characterize and treat this *** Participants were children with physician-diagnosed PPCC,referred to the academic hospital Amsterdam UMC in the netherlands between november 2021 and March *** factors and information on post-COVID symptoms,comorbidities,and impact on daily life were *** clusters were identified using an unsupervised and unbiased approach for mixed data *** Analysis of 111 patients(aged 3–18 years)revealed three distinct clusters within *** 1(n=62,median age=15 years)predominantly consisted of girls(74.2%).These patients suffered relatively more from exercise intolerance,dyspnea,and smell *** 2(n=33,median age=13 years)contained patients with an even gender distribution(51.5%girls).They suffered from relatively more sleep problems,memory loss,gastrointestinal symptoms,and *** 3(n=16,median age=11 years)had a higher proportion of boys(75.0%),suffered relatively more from fever,had significantly fewer symptoms(median of 5 symptoms compared to 8 and 10 for clusters 1 and 2 respectively),and experienced a lower impact on daily *** This study identified three distinct clinical PPCC phenotypes,with variations in sex,age,symptom patterns,and impact on daily *** findings highlight the need for further research to understand the potentially diverse underlying mechanisms contributing to post-COVID symptoms in children.

关键词： Adolescents Clusters Long COVID Pediatric Phenotypes Post-COVID syndrome

Microglia as hackers of the matrix:sculpting synapses and the extracellular space

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Cellular & Molecular Immunology 2021年第11期18卷 2472-2488页

作者： Joshua D.Crapser Miguel A.Arreola kate I.Tsourmas kim n.Green Department of neurobiology and Behavior University of CaliforniaIrvineCAUSA

Microglia shape the synaptic environment in health and disease,but synapses do not exist in a ***,pre-and postsynaptic terminals are surrounded by extracellular matrix(ECM),which together with glia comprise the four elements of the contemporary tetrapartite synapse *** research in this area is still just beginning,accumulating evidence points toward a novel role for microglia in regulating the ECM during normal brain homeostasis,and such processes may,in turn,become dysfunctional in *** it relates to synapses,microglia are reported to modify the perisynaptic matrix,which is the diffuse matrix that surrounds dendritic and axonal terminals,as well as perineuronal nets(Pnns),specialized reticular formations of compact ECM that enwrap neuronal subsets and stabilize proximal *** interconnected relationship between synapses and the ECM in which they are embedded suggests that alterations in one structure necessarily affect the dynamics of the other,and microglia may need to sculpt the matrix to modify the synapses ***,we provide an overview of the microglial regulation of synapses,perisynaptic matrix,and Pnns,propose candidate mechanisms by which these structures may be modified,and present the implications of such modifications in normal brain homeostasis and in disease.

关键词： neuroscience Perineuronal nets Microglia Extracellular matrix neuroinflammation

Spectroscopic properties of Er3+/Ho3+/Tm3+ doped α-SiAlOn ceramics under 793 nm excitation

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Progress in natural Science:Materials International 2021年第6期31卷 891-897页

作者： Bina Chaudhary Dhani Ram Dhakal Tae-Ho kim Soo Wohn Lee Yuwaraj k.kshetri Department of Fusion Science and Technology Sun Moon University Research Center for Eco-Multifunctional nano Materials Sun Moon University Department of Environment and Bio-Chemical Engineering Sun Moon University

This paper reports the first demonstration of super broadband infrared downshifting emission extending from1640 nm to 2200 nm with the full width at half maximum of ～ 417 nm in lanthanides(Er3+, Ho3+, and Tm3+)-doped α-SiAlOn ceramics upon 793 nm excitation. Using α-Si3n4ceramic as a precursor the lanthanides-dopedα-SiAlOn ceramics were synthesized by the hot-press method. The lanthanides induced no significant secondary phases in the sintered α-SiAlOn ceramics. Strong two-photon upconversion emission bands centered at 547,671 and 694 nm have also been observed upon 793 nm excitation. The time-resolved measurements of the upconversion emissions confirm that the efficient energy transfer among the Er3+, Ho3+and Tm3+ions as well as the ground state absorption in Er3+and Tm3+are responsible for the observed spectroscopic properties.

关键词： α-SiAlOn Upconversion Downshifting 793 nm excitation

Computational approaches for fast generation of digital 3D video holograms(Invited Paper)

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Chinese Optics Letters 2009年第12期7卷 1083-1091页

作者： Seung-Cheol kim Eun-Soo kim 3D Display Research Center Department of Electronic Engineering Kwangwoon University

Several approaches for fast generation of digital holograms of a three-dimensional （3D） object have been discussed. Among them, the novel look-up table （n-LUT） method is analyzed to dramatically reduce the number of pre-calculated fringe patterns required for computation of digital holograms of a 3D object by employing a new concept of principal fringe patterns, so that problems of computational complexity and huge memory size of the conventional ray-tracing and look-up table methods have been considerably alleviated. Meanwhile, as the 3D video images have a lot of temporally or spatially redundant data in their inter- and intra-frames, computation time of the 3D video holograms could be also reduced just by removing these redundant data. Thus, a couple of computational methods for generation of 3D video holograms by combined use of the n-LUT method and data compression algorithms are also presented and discussed. Some experimental results finally reveal that by using this approach a great reduction of computation time of 3D video holograms could be achieved.

关键词： LUT Computational approaches for fast generation of digital 3D video holograms CGH

Inexpensive synthesis of a high-performance Fe3O4-SiO2-TiO2 photocatalyst： Magnetic recovery and reuse

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Frontiers of Chemical Science and Engineering 2016年第3期10卷 405-416页

作者： nadir Abbas Godlisten n. Shao Syed M. Imran Muhammad S. Haider Hee Taik kim Department of Chemical Engineering Hanyang University Ansan-si Gyeonggi-do 426-791 Republic of Korea Department of Civil and Environmental Engineering Hanyang University Ansan-si Gyeonggi-do 426-791 Republic of Korea Department of Chemical Engineering University of Gujrat HH Campus Punjab Pakistan

A sol-gel technique has been developed for the synthesis of a magnetite-silica-titania （Fe3O4-SiO2-TiO2） tertiary nanocomposite with improved photocatalytic properties based on the use of inexpensive titania and silica precursors. The exceptional photocatalytic activity of the resulting materials was demonstrated by using them to photocatalyze the degradation of methylene blue solution. The best formulation achieved 98% methylene blue degradation. An interesting feature of the present work was the ability to magnetically separate and reuse the catalyst. The efficiency of the catalyst remained high during two reuses. The synthesized nanomaterials were characterized by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, transmission electron micro- scopy （TEM）, Fourier transform infrared （FTIR） spectro- scopy, ultra-violet-visible spectroscopy, diffuse reflectance spectroscopy, and thermogravimetric analysis. XRD ana- lysis revealed the formation of multicrystalline systems of cubic magnetite and anatase titania crystals. SEM and TEM characterization revealed well-developed and homo- geneously dispersed particles of size less than 15 nm. FTIR spectra confirmed the chemical interaction of titania and silica. It was further noticed that the optical properties of the prepared materials were dependent on the relative contents of their constituent metal oxides.

关键词： sol-gel photocatalysis magnetic recovery,TiO2 Fe3O4 SiO2