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Properties of Dispersion Casting of Y2O3 Particles in Hypo,Hyper and Eutectic Binary Al-Cu Alloys

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journal of Materials science & Technology 2008年第1期24卷 57-59页

作者： j.j.park g.H.kim s.M.Hong s.H.lee M.K.lee C.K.Rhee Nuclear Nano-Materials Development Lab. Korea Atomic Energy Research Institute （KAERI） 150 Deukjin-dongYuseong-gu Daejeon Korea

In the present work,the dispersion casting of Y-2O-3 particles in aluminum-copper alloy was investigated in terms of microstructural changes with respect to Cu contents of 20 （hypo）,33 （eutectic） and 40 （hyper） wt pct by scanning electron microscopy （sEM） and energy dispersive spectroscopy （EDs）.For the fabrication of Al-Cu alloy dispersed Y-2O-3 ceramic particles,stir casting method was *** case of Al-20 wt pct Cu alloy （hypoeutectic）,sEM images revealed that primary Al was grown up in the *** that,eutectic phase with well dispersed ceramic particles was *** case of eutectic composition,Y-2O-3 particles were uniformly dispersed in the *** the Cu is added into Al up to 40 wt pct （hypereutectic）,primary phase was grown up without any Y-2O-3 ceramic particles in the early stage of ***, eutectic phase was formed with well dispersed ceramic *** can be concluded that Y-2O-3 ceramic particles is mostly dispersed in case of eutectic composition in Al-Cu alloy.

关键词： Dispersion casting Y2O3 particles stir casting Al-Cu alloy

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

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

Power management unit chip design for automobile active-matrix organic light-emitting diode display module

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journal of Central south University 2009年第4期16卷 621-628页

作者： kim j H park j H kim j H CAO T V lee T Y BAN H j YANg K kim H g HA P B kim Y H Department of Electronic Engineering Changwon National University 9 Sarim-Dong Changwon 641-773 Korea Denso Ps Electronics Corporation 47 Seongsan-Dong Changwon 641-315 Korea

A power management unit （PMU） chip supplying dual panel supply voltage, which has a low electro-magnetic interference （EMI） characteristic and is favorable for miniaturization, is designed. A two-phase charge pump circuit using external pumping capacitor increases its pumping current and works out the charge-loss problem by using bulk-potential biasing circuit. A low-power start-up circuit is also proposed to reduce the power consumption of the band-gap reference voltage generator. And the ring oscillator used in the ELVss power circuit is designed with logic devices by supplying the logic power supply to reduce the layout area. The PMU chip is designed with MagnaChip＇s 0.25 μ high-voltage process. The driving currents of ELVDD and ELVss are more than 50 mA when a sPICE simulation is done.

关键词： DC-DC converter AMOLED charge pumping power management unit (PMU) dual panel supply voltage

Portable system for CWA Detection Using Micro Array gas sensor

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稀有金属材料与工程 2006年第A03期35卷 124-128页

作者： j.H.Kwak Y.T.Lim g.H.kim N.j.Choi H.D.park g.H.Rue j.s.Huh j.C.kim D.D.lee school of Electrical Engineering and Computer science Kyungpook National UniversityDaegu 1370Korea Electronics and Telecommunications Research Institute Future Technology Research Division New Functional Information Devices TeamGajeongYuseong-GuDaejeon 161 Korea Korea Electronics Technology Institute Yatap-DongBundang-GuSeongnam-SiGyeonggi-Do #68Korea Department of Materials science and Metallurgy Kyungpook National UniversityDaegu 1370Korea Department of Chemical Engineering Kyungpook National UniversityDaegu 1370Korea

Biochemistry weapon is raising new tools of war and *** research is an experiment about portable system for CWAs (chemical warfare agents) detection using micro array gas *** were divided into four types such as blood, nerve,vesicant,and choking *** detect various CWAs,semiconductor thick film sensor array based on tin oxide was fabricated and their gas responses were *** temperature was range of 250℃to 350℃and gas concentration was range of 0.1μg/g to 10μg/*** array was measured as operating temperatures,concentrations for four simulant agents of *** parameters from results were carried out classification among CWAs through the principal component analysis (PCA).Also,classification of gases is studied using adaptive resonance theory (ART) that is one of neural network *** displayed using PDA system.

关键词： snO2 chemical warfare agents(CWAs) portable system ART array PCA

study of the Interface between steel Insert and Aluminum Casting in EPC

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journal of Materials science & Technology 2008年第1期24卷 60-64页

作者： K.H.Choe K.s.park B.H.Kang g.s.Cho K.Y.kim K.W.lee M.H.kim A.Ikenaga s.Koroyasu Advanced Material Processing Team Korea Institute of Industrial Technology IncheonKorea Department of Materials Engineering Korea University of Technology and Education ChoongnamKorea Department of Materials science and Engineering Inha University IncheonKorea Department of Metallurgy and Materials science graduate school of Engineering Osaka Prefecture UniversityOsakaJapan Department of Mechanical and Precision systems Teiko University UtsunomiyaJapan

The effective surface treatment method for steel insert composited with Al base metal by expendable pattern casting （EPC） process and the bonding interface between steel insert and Al base metal were *** was found that Zn plating on steel insert was effective on improving the bonding property between steel insert and Al base metal in EPC *** is thought to promote the formation of diffusion *** almost none content of Zn was observed in the boundary which had been plated on the steel insert.A diffusion layer consisting of Al,si and Fe was formed at the insert/alloy interface and its hardness was higher than the steel insert as matter of course Al base *** layer turned out to be intermetallic compounds of Al-si-Fe *** pouring temperature promoted the diffusion of Fe into Al alloy,so Fe content in intermetallic layers increased at higher pouring *** layer nearest to steel disappeared due to applied pressure.

关键词： Expendable pattern casting Insert casting Intermetallic compound Al-si-Fesystem

肺腺癌的体积倍增时间：主要组织学亚型与预后之间的关系

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国际医学放射学杂志 2020年第4期 492-493页

作者： s.park s.M.lee s.kim j.g.lee s.Choi K.H.Do 吴珺 Department of Radiology and Research Institute of Radiology University of Ulsan College of Medicine Asan Medical Center

体积倍增时间(VDT)是区分侵袭性肿瘤与缓慢生长肿瘤的一个主要参数。原发性肺腺癌的不同组织亚型的VDT如何变化及此种变化的预后价值都是未知的。目的研

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A Review on Interface Engineering of MXenes for Perovskite solar Cells

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Nano-Micro Letters 2023年第8期15卷 270-308页

作者： srikanta Palei g.Murali Choong‑Hee kim Insik In seul‑Yi lee soo‑jin park Department of Chemistry Inha University100 InharoIncheon 22212South Korea Department of Polymer science and Engineering Department of IT‑Energy Convergence(BK21 Four)Chemical Industry InstituteKorea National University of TransportationChungju 27469South Korea

With an excellent power conversion efficiency of 25.7%,closer to the shockley–Queisser limit,perovskite solar cells(PsCs)have become a strong candidate for a next-generation energy ***,the lack of stability and reliability in PsCs remained challenging for ***,such as interfacial and structural engineering,have a more critical influence on enhanced ***,two-dimensional materials,have emerged as promising materials in solar cell applications due to their metallic electrical conductivity,high carrier mobility,excellent optical transparency,wide tunable work function,and superior mechanical *** to different choices of transition elements and surface-terminating functional groups,MXenes possess the feature of tuning the work function,which is an essential metric for band energy alignment between the absorber layer and the charge transport layers for charge carrier extraction and collection in ***,adopting MXenes to their respective components helps reduce the interfacial recombination resistance and provides smooth charge transfer paths,leading to enhanced conductivity and operational stability of *** review paper aims to provide an overview of the applications of MXenes as components,classified according to their roles as additives(into the perovskite absorber layer,charge transport layers,and electrodes)and themselves alone or as interfacial layers,and their significant importance in PsCs in terms of device performance and ***,we discuss the present research status and future directions toward its use in PsCs.

关键词： MXenes Perovskite solar cells Additives Interfacial layer Electrodes

Beta-phase transformation of polyvinylidene fluoride with supersonically sprayed ZnsnO_(3) cuboids for flexible piezoelectric nanogenerators

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journal of Materials science & Technology 2024年第10期177卷 103-113页

作者： Bhavana joshi Taegun kim Woojin Lim Edmund samue Chanwoo park Ali Aldalbahi Mohamed El-Newehy Hae-seok lee seongpil An sam s.Yoon school of Mechanical Engineering Korea UniversitySeoul 02841Republic of Korea Core Component Technology Team Samsung Electronics Co Ltd.Mobile R&D CenterSamsung-roSuwon-siGyeonggi-doRepublic of Korea Energy Environment Policy and Technology Graduate School of Energy and Environment(KU-KIST Green School)Korea UniversitySeoul 02841Republic of Korea Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia sKKU Advanced Institute of Nanotechnology(sAINT) Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Department of Nano science and Technology Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea Department of Nano Engineering Sungkyunkwan University(SKKU)Suwon 16419Republic of Korea

Flexible self-powered electromechanical devices,such as piezoelectric nanogenerators(PENgs),which are used in wearable and implantable devices,are emerging as state-of-the-art clean energy *** this study,a scalable supersonic spraying technique was used to prepare flexible piezocomposite films of polyvinylidene fluoride(PVDF)and hydrothermally synthesized ZnsnO_(3)(ZsO)cubes for *** spectra confirmed that the transformation of the α-phase of PVDF to its β-phase was induced by the shear stress generated between the ZsO particles and PVDF polymer during supersonic *** op-timized sample comprising 0.43 g of ZsO cubes and 1 g of PVDF produced a maximum piezopotential of 41.5 V and a short-circuit current,I_(sc),of 52.5 μA.A maximum power density of 50.6 μW cm-2 was ob-tained at a loading resistance of 0.4 MΩ,which matched the impedance of the ***-term tapping and bending cycles of N_(tap)=4200 and N_(bend)=600 yielded piezopotentials of 40.5 and 1.7 V,*** addition,electrical poling for 2 h increased the piezopotential to 52 V owing to the alignment of the ferroelectric dipoles in the PVDF.

关键词： ZnsnO_(3) PVDF Composite Perovskite supersonic cold spray Piezoelectric nanogenerator