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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

superplasticity of fine-grained Mg-10Li alloy prepared by severe plastic deformation and understanding its deformation mechanisms

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journal of Magnesium and Alloys 2024年第1期12卷 316-331页

作者： H.T.jeong s.W.Lee W.j.kim Department of Materials science and Engineering Hongik UniversityMapo-guSangsu-dong 72-1Seoul 121-791Republic of Korea

The superplastic behavior and associated deformation mechanisms of a fine-grained Mg-10.1 Li-0.8Al-0.6Zn alloy(LAZ1011)with a grain size of 3.2μm,primarily composed of the BCCβphase and a small amount of the HCPαphase,were examined in a temperature range of 473 K to 623 *** microstructural refinement of this alloy was achieved by employing high-ratio differential speed *** best superplasticity was achieved at 523 K and at strain rates of 10^(-4)-5×10^(-4)s^(-1),where tensile elongations of 550±600%were *** the heating and holding stage of the tensile samples prior to tensile loading,a significant increase in grain size was observed at temperatures above 573 ***,it was important to consider this effect when analyzing and understanding the superplastic deformation behavior and *** the investigated strain rate range,the superplastic flow at low strain rates was governed by lattice diffusion-controlled grain boundary sliding,while at high strain rates,lattice diffusion-controlled dislocation climb creep was the rate-controlling deformation *** was concluded that solute drag creep is unlikely to *** the late stages of deformation at 523 K,it was observed that grain boundary sliding led to the agglomeration of theαphase,resulting in significant strain *** mechanism maps were constructed forβ-Mg-Li alloys in the form of 2D and 3D formats as a function of strain rate,stress,temperature,and grain size,using the constitutive equations for various deformation mechanisms derived based on the data of the current tests.

关键词： Magnesium-lithium alloy superplasticity severe plastic deformation Grain size Grain growth

single-phase Active Power Filter based on Rotating Reference Frame Method

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Single-phase Active Power Filter based on Rotating Reference...

2005国际电机与系统学术会议

作者： Y.j.kim j.s.kim Y.s.kim Department of Computer Aided Control Yuhan CollegeBucheon 185-34Korea Deptment.of Electrical Engineering Inha UniversityInchon 402-751Korea Deptment.of Electrical Engineering Inha UniversityInchon 402-751Korea

＜正＞ This paper presents a new control method of the single-phase active power filter （APF） for the compensation of harmonic current components in nonlinear loads. In order to use a new transformation theory, the two-phase system by constructing a imaginary second-phase is formed. In the conventional method, an imaginary-phase lagged to the load current T/4（here T is the fundamental cycle） is made. But in this proposed method, the new signal as the second phase is the delayed through the filter. As this control method is applied to the system of single-phase, an instantaneous calculation was developed rather by using the rotating reference frames synchronized with source-frequency than by applying instantaneous reactive power theory that uses the conventional fixed reference *** control scheme of single-phase APF is analyzed with the experimental results in a laboratory prototype to verify the validities of the proposed control methods.

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Discovery of Pyrrhotite-Chalcopyrite Bearing Amphibole Megacrysts in Tongling Area, Anhui Province

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journal of China University of Geosciences 2004年第1期15卷 36-45页

作者： QinXinlong DuYangsong Tianshihong H.K.Lee Yinjingwu s.j.kim Key Laboratory of Lithospheric Tectonics and Lithoprobing Technology China University of GeosciencesMinistry of EducationBeijing100083China Institute of Mineral Resources Chinese Academy of Geological SciencesBeijing100037China Department of Geology College of Nature ScienceChungnam National UniversityTaejon305764Republic of Korea

some pyrrhotite-chalcopyrite-bearing amphibole megacrysts (including pyroxene megacrysts) were discovered in Mesozoic augite diorite-porphyrite at Caoshan in Tongling area, Anhui Province. The amphibole megacrysts,belonging mainly to pargasite and magnesiohastingsite, are characteristic of the amphibole composition derived from mantle and crystallized in lower crust. In general, the aggregates of pyrrhotite-chalcopyrite take the shapes of cylinder and sphere. Three occurrences have been recognized in the amphibole megacrysts: parallel linear, bunchy and scattered. The unique cylinder-like shape of the aggregates and remarkable Ni-poor sulfides in Caoshan are distinctively different from the spherical Ni-rich sulfides in pyroxene megacrysts and any other kinds of megacrysts. In terms of composition, the amphibole megacrysts and their sulfides in Caoshan are similar to those in the pyroxenite xenoliths in Qilin, Guangdong Province. In terms of origin, the pyrrhotite-chalcopyrites as exsolution products resulted from the subsolidus re-equilibration of sulfide solid solution within amphibole megacrysts. such pyrrhotite-chalcopyrite-bearing amphibole megacrysts were first discovered inside and outside China. This discovery is important for the study of regional magma evolution and its associated mineralizations and ore sources as well.

关键词： amphibole megacrysts pyrrhotite-chalcopyrite Tongling Anhui Province.

TEsTs ON sTRUCTURALLY DEFICIENT RC sLABs sTRENGTHENED WITH FIBRE REINFORCED POLYMER （FRP） COMPOsITEs

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TESTS ON STRUCTURALLY DEFICIENT RC SLABS STRENGTHENED WITH F...

第三届全国FRP学术交流会议

作者： s.T.smith s.j.kim Centre for Built Infrastructure Research Faculty of Engineering University of Technology Sydney PO Box 123 Broadway NSW 2007 Australia Centre for Built Infrastructure Research Faculty of Engineering University of Technology Sydney PO Box 123 Broadway NSW 2007 Australia

＜正＞ This paper reports the results of a series of tests on fibre reinforced polymer （FRP） strengthened reinforced concrete （PC） slabs, which were recently undertaken at the University of Technology, sydney. The slabs were reinforced with high-strength low-ductile steel reinforcement and strengthened with either carbon FRP （CFRP） or glass FRP （GFRP） composites. The unstrengthened control slabs failed by fracture of the steel tension reinforcement while the FRP strengthened slabs failed by debonding of the FRP followed by rupture of the tension steel. The FRP-strengthened slabs were stronger than their unstrengthened counterparts and displayed considerable ductility.

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Preparation of Cerium Hydroxide from Waste Polishing Powder

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Preparation of Cerium Hydroxide from Waste Polishing Powder

第八届东亚资源再生技术国际会议

作者： C.j.kim H.s.Yoon H.C.Eom j.s.kim Korea Institute of Geoscience and Mineral Resources Gajongdong 30 Yusonggu Daejon 305-350 KOREA Korea Institute of Geoscience and Mineral Resources Gajongdong 30 Yusonggu Daejon 305-350 KOREA Korea Institute of Geoscience and Mineral Resources Gajongdong 30 Yusonggu Daejon 305-350 KOREA Korea Institute of Geoscience and Mineral Resources Gajongdong 30 Yusonggu Daejon 305-350 KOREA

＜正＞In this study, the separation of cerium hydroxide was investigated from waste cerium polishing powder. Waste cerium polishing powder contains 64.5 wt % of rare earth oxides and the content of cerium oxide is 36.5 wt %. since cerium oxide, 56.3% of the rare earths, is the most stable in rare earth oxides , the dissolution of cerium oxide in acid solution is not easy. Therefore, the process of separating rare earth oxides by sulfation and water leaching was examined in order to increase the recovery of rare earth. Rare earth elements were recovered in the form of ReNa（sO4）2 by addition of sodium sulfate to leached solution. The slurry of rare earth hydroxide was prepared by input of ReNa（sO4）2to sodium hydroxide solution. After the oxidation of cerous hydroxide （Ce（OH）3） to eerie hydroxide（Ce（OH）4） by aeration, eerie hydroxide was separated from rare earth hydroxide by controlling the acidity of solution.

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CHARACTERIsTICs OF AN EXCAVATION DAMAGED ZONE DEVELOPED AROUND KAERI UNDERGROUND REsEARCH TUNNEL Paper No.194

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CHARACTERISTICS OF AN EXCAVATION DAMAGED ZONE DEVELOPED AROU...

IsRM-sponsored International symposium on Rock Mechanics:"Rock Characterisation,Modelling and Engineering Design Methods"(sINOROCK2009)

作者： s.Kwon j.s.kim W.j.Cho Korea Atomic Energy Research Institute

ISBN: (纸本)9789628014170

In Korea,a Korean reference disposal system(KRs) was developed for the permanent disposal of spent fuels in a deep geological *** order to validate the feasibility,safety,stability,and reliability of this system,an underground research tunnel, KAERI Underground Research Tunnel(KURT),was constructed as in *** is located in a mountain at the rear of the KAERI *** major rock type at the KURT site is granite,which is considered as one of the host rocks for a geological *** blasting was applied to reduce the outbreak and damaged *** diameters of the main blastholes and perimeter holes were 36mm and 17mm,*** advance rate was changed from 1.7 to 3.6m depending on the rock condition in the EDZ study *** characteristics of an EDZ around a tunnel were investigated with various laboratory as well as in situ *** this study,the influence of an EDZ on the mechanical,hydraulic,and thermal behaviors around the KURT and the conceptual repository design adapting the KRs was investigated based on three-dimensional computer simulations and the rock properties measured from the laboratory and in situ tests. (1) In situ test:A Goodman jack test showed that the deformation modules were influenced by a blasting to a depth of 0.6～2m. According to the RQDs of the rock cores from the EDZ study area,the average RQD in the 0～2m range,where the blasting impact is significant,was 67,while it was 81 at a deeper *** means the RQD was decreased by about 17%by the blasting. (2) Empirical equations:Empirical equations based on ground vibration predicted the EDZ as 0.3～2.3m. (3) Laboratory tests:From the laboratory tests,the EDZ size could be estimated to be around 0.9～*** elastic modules in the EDZ were decreased by about 56%.From a borehole radar reflection survey and a subtracting technique,it was possible to detect the new reflectors generated by a tunnel blasting. (4) Computer modeling:The influence of EDZ on mechanical

关键词： EDZ underground research tunnel MH coupling KURT blasting damage

An Efficient Long short-TermMemory and Gated Recurrent Unit Based smart Vessel Trajectory Prediction Using Automatic Identification system Data

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Computers, Materials and Continua 2024年第1期81卷 1789-1808页

作者： Zaman U. Khan j. Lee E. Hussain s. Balobaid A.s. Aburasain R.Y. kim K. Department of Computer Engineering Chungnam National University Daejeon 34134 South Korea Department of Environmental IT Engineering Chungnam National University Daejeon 34134 South Korea Autonomous ship Research Center Samsung Heavy Industries Daejeon 34051 South Korea ICAROs Center (PRIsMA Lab) University of Naples Federico II Naples 80131 Italy Department of Computer science College of Computer Science and Information Technology Jazan University Jazan 45142 Saudi Arabia

Maritime transportation, a cornerstone of global trade, faces increasing safety challenges due to growing sea traffic volumes. This study proposes a novel approach to vessel trajectory prediction utilizing Automatic Identification system (AIs) data and advanced deep learning models, including Long short-Term Memory (LsTM), Gated Recurrent Unit (GRU), Bidirectional LsTM (DBLsTM), simple Recurrent Neural Network (simpleRNN), and Kalman Filtering. The research implemented rigorous AIs data preprocessing, encompassing record deduplication, noise elimination, stationary simplification, and removal of insignificant trajectories. Models were trained using key navigational parameters: latitude, longitude, speed, and heading. spatiotemporal aware processing through trajectory segmentation and topological data analysis (TDA)was employed to capture dynamic *** using a three-month AIs dataset demonstrated significant improvements in prediction accuracy. The GRU model exhibited superior performance, achieving training losses of 0.0020 (Mean squared Error, MsE) and 0.0334 (Mean Absolute Error, MAE), with validation losses of 0.0708 (MsE) and 0.1720 (MAE). The LsTM model showed comparable efficacy, with training losses of 0.0011 (MsE) and 0.0258 (MAE), and validation losses of 0.2290 (MsE) and 0.2652 (MAE). Both models demonstrated reductions in training and validation losses, measured by MAE, MsE, Average Displacement Error (ADE), and Final Displacement Error (FDE). This research underscores the potential of advanced deep learning models in enhancing maritime safety through more accurate trajectory predictions, contributing significantly to the development of robust, intelligent navigation systems for the maritime industry. © 2024 The Authors. Published by Tech science Press.

关键词： AIs data deep learning GRU LsTM smart vessel Trajectory prediction

肝移植后CT低密度与1个月内死亡或肝移植术失败的相关性研究

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国际医学放射学杂志 2018年第3期 354-355页

作者： j.s.kim j.H.Kwon K.W.kim s.Y.kim s.H.Choi G.W.song 高月 Department of Radiology and Research Institute of Radiology Asan Medical Center University of Ulsan College of Medicine

摘要目的验证CT的低密度是否与肝移植术失败或术后1个月内死亡具有相关性及其诊断价值。材料与方法纳入2014年12月—2016年8月期间663例接受肝移植并在

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