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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

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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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

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反射地震成像在绘制结晶岩浅部断裂带中的应用

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油气藏评价与开发 1995年第1期 85-86页

作者： j.s.kim

高分辨率反射地震正逐步应用于解决地质勘探及工程问题。然而,在结晶岩环境中应用反射地震技术时仍存在很多问题。当结晶岩中存在裂隙时,采集的反射地震数据的信噪比常常很低,反射同相轴也不够连续。因此,研究结晶岩裂隙带成像时的数据... 详细信息

高分辨率反射地震正逐步应用于解决地质勘探及工程问题。然而,在结晶岩环境中应用反射地震技术时仍存在很多问题。当结晶岩中存在裂隙时,采集的反射地震数据的信噪比常常很低,反射同相轴也不够连续。因此,研究结晶岩裂隙带成像时的数据处理与校正方法是很重要的。我们对以前采集的两个数据集重新进行了处理和分析,研究重点是60～100米深度上的浅层反射同相轴。该数据集分辨率很低,信噪比较高,分别由两个不同的承包商在加拿大Pinawa和瑞士的“AsPO”岛采集而得。处理策略之一是增强隐含在大幅

关键词：结晶岩反射地震岩石断裂带断层带构造带浅层反射表层反射

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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喷吹CaO基熔剂控制铝脱氧镇静钢的氧化物夹杂形态

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武钢技术 1992年第8期30卷 25-30页

作者： j.s.kim 陈怡然南朝鲜

1.前言浦项钢铁公司光阳厂的第一炼钢车间的主要产品是铝脱氧镇静钢。去除脱氧产物的操作是进行吹 Ar 和 RH 处理。然而,钢中小于5μm 的 Al_2O_3难以上浮去除。这些细小的Al_2O_3夹杂在连铸过程中可导致中间包水口堵塞,甚至使浇铸中断... 详细信息

1.前言浦项钢铁公司光阳厂的第一炼钢车间的主要产品是铝脱氧镇静钢。去除脱氧产物的操作是进行吹 Ar 和 RH 处理。然而,钢中小于5μm 的 Al_2O_3难以上浮去除。这些细小的Al_2O_3夹杂在连铸过程中可导致中间包水口堵塞,甚至使浇铸中断和产品产生缺陷。因此,浦项公司采用从中间包水口喂CaAl 线的方法来避免中间包水口堵塞和控制夹杂形态。

关键词：镇静钢铝脱氧熔剂去夹杂

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A study on Micromechanical Behaviors of Multi-phase steel during Uniaxial Loading

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A Study on Micromechanical Behaviors of Multi-phase steel du...

Asia steel International Conference 2012(Asia steel 2012)

作者： j.s.kim E.Y.kim Y.H.Choi C.U.jeong W.C.Woo s.-H.Choi Department of Materials science and Metallurgical Engineering Sunchon National UniversitySunchonJeonnam540-742South Korea Neutron science Division Korea Atomic Energy Research InstituteDaejeon305-600South Korea

＜正＞The stress-strain relationship between ferrite and martensite phases in the commercial dual-phase DP980 steel was studied by using in-situ neutron diffraction and the crystal plasticity finite element method（CPFEM）.The phase identification method based on the image quality（IQ） of electron backscatter diffraction（EBsD） and a filtering process was used to obtain information concerning individual crystallographic orientations for ferrite and martensite phases in DP980 ***（200） and （211） lattice strains of ferrite and martensite phases were measured along the loading and transverse directions as a function of macroscopic stress using the in-situ neutron diffraction.A CPFEM based on representative volume elements（RVEs） was applied to determine the microscopic hardening parameters for each phase by fitting the measured macroscopic stress and measured（200） and（211） lattice strains.

关键词： Dual phase in-situ neutron diffraction Lattice strain EBsD CPFEM

MRI皮质厚度预测帕金森病从轻度认知障碍到痴呆的转化：一种基于机器学习的模型

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国际医学放射学杂志 2021年第5期 604-605页

作者： N.Y.shin M.Bang s.W.Yoo j.s.kim E.Yun Ui.Yoon 宋瑞瑞

摘要组间比较结果显示皮质变薄与帕金森病(PD)痴呆(PDD)相关联,但其在临床上的应用受限。目的基于机器学习的模型,研究MRI影像上皮质厚度是否有助于在个体水

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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

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