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Remarkably slow corrosion rate of high-purity Mg microalloyed with 0.05wt% Sc

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Journal of Magnesium and Alloys 2023年第3期11卷 991-997页

作者： soo-Min baek Jeong-Ki Kim Du-Won Min Sung soo Park Department of Materials Science and Engineering Ulsan National Institute of Science and TechnologyUlsan 44919Republic of Korea

We report that the corrosion resistance of Mg is significantly improved by adding 0.05wt%*** rates evaluated from weight loss values after room-temperature immersion in 0.6 M NaCl solution for two weeks were 0.27 and 4.0 mm y^(-1)for the high-purity Mg samples with and without microalloyed 0.05wt%Sc,*** beneficial effect of Sc microalloying on the corrosion resistance of Mg is discussed in connection with Sc-induced microstructural modifications.

关键词： Magnesium Microalloying Intermetallic phase Microgalvanic corrosion

Microstructure and corrosion resistance of a Mg2Sn-dispersed Mg alloy subjected to pulsed electron beam treatment

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Journal of Magnesium and Alloys 2020年第2期8卷 345-351页

作者： Daseul Lee Beomcheol Kim soo-Min baek Jisoo Kim Hyung Wook Park Jung Gu Lee Sung soo Park School of Materials Science and Engineering Ulsan National Institute of Science and TechnologyUlsan 44919Republic of Korea School of Mechanical Aerospace and Nuclear EngineeringUlsan National Institute of Science and TechnologyUlsan 44919Republic of Korea School of Materials Science and Engineering University of UlsanUlsan 44610Republic of Korea

We report that the corrosion resistance of a Mg-Sn-based alloy with MgzSn precipitates can be considerably improved by surface modification using pulsed electron beam *** alloy subjected to a pulse electron beam treatment showed a modified surface layer with a thickness of〜12 μm,appearing more resistant to corrosion attack than the bare surface of the *** 0.6 M NaCl solution,the alloys with and without the surface modification exhibited average corrosion rates of 4.3 and 8.1 mm y^-1,*** improved corrosion resistance was attributed to reduced cathodic activation,resulting from the surficial reduction of relatively noble Mg2Sn precipitates.

关键词： Magnesium alloy Mg2Sn Intermetallic compound Pulsed electron beam treatment Corrosion

Fabrication of high-strength duplex nanoporous Cu by dealloying a dual-phase Mg-Cu precursor alloy

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Journal of Magnesium and Alloys 2020年第3期8卷 910-916页

作者： Si-Young Lee soo-Min baek Eun-Ji Gwak Na-Ri Kang Ju-Young Kim Su-Hyeon Kim Jung Gu Lee Sung soo Park School of Materials Science and Engineering Ulsan National Institute of Science and TechnologyUlsan 44919Republic of Korea Korea Institute of Materials Science Changwon 51508Republic of Korea School of Materials Science and Engineering University of UlsanUlsan 44610Republic of Korea

Duplex nanoporous Cu was successfully fabricated by dealloying a dual-phase Mg-Cu precursor alloy consisting of intermetallic Mg2Cu and *** duplex nanoporous Cu with embedded nanoporous struts exhibited highly enhanced strength compared to the typical monolithic nanoporous Cu under both compressive and flexural test conditions at room temperature;the duplex np-Cu sample exhibited a 12 times higher compressive strength and a 40 times greater flexural strength than the monolithic np-Cu *** responsible for the strength enhancement in the duplex nanoporous Cu are discussed.

关键词： Mg-Cu alloy Nanoporous Cu Dealloying Duplex structure Strength

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广义Cantor函数的不可微点集的维数

数学学报（中文版） 2014年第5期57卷 939-946页

作者： In soo baek 李文侠韩国釜山外国语大学数学系华东师范大学数学系

设K■R为由满足强分离条件的相似压缩映射族{h_k(x)=a_kx+b_k,k=1,…,N}所生成的自相似集,此处N≥2.对一个概率向量p=(p_1,…p_N),设γ_p为对应的支撑在K上的自相似测度.在单位线段上定义广义Cantor函数f(x)=γ_p([0,x]∩K),这里假设.... 详细信息

设K■R为由满足强分离条件的相似压缩映射族{h_k(x)=a_kx+b_k,k=1,…,N}所生成的自相似集,此处N≥2.对一个概率向量p=(p_1,…p_N),设γ_p为对应的支撑在K上的自相似测度.在单位线段上定义广义Cantor函数f(x)=γ_p([0,x]∩K),这里假设.设数ξ和q+β(q)分别由■和■,β'(q)=-1所确定.本文研究集合K中使得函数f(x)的导数不存在的点集,使得函数f(x)的导数为零的点集,及使得函数f(x)的导数为无穷的点集的维数,本文结果表明上述定义的两个数可以给出这些维数的一个很好的刻画.

关键词：自相似测度广义Cantor函数不可微点

Dynamic Model of an FC-and UC-based IPT system for railway vehicle

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Dynamic Model of an FC-and UC-based IPT system for railway v...

快速间歇训练对大学生羽毛球运动员神经肌肉功能的影响

11th International Conference on Electrical Machines and Systems

作者： Kyung-Hee Han Byung-Song Lee Hyun-Jun,Park Sam-Young,Kwon soo-Hyun,baek Department of Electrical Engineering Dongguk University SeoulKorea 100-715

＜正＞A fuel cell powered system is regarded as a high current and low voltage *** of electric loads on the power source are of importance to design an optimal integrated *** particular,dynamics of the system should be considered to determine a configuration and the size of the *** this paper,we present an IPT system that operates in parallel with FC and UC bank,because the available power generated from a FC power plant may not be sufficient to meet sustained load demands,especially during peak demand or transient events encountered in railway vehicle applications.A new dynamic model and design methodology for an FC-and UC-based IPT system for railway vehicle applications has been *** results are presented using MATLAB, Simulink,and Ansoft EM environments based on the mathematical and dynamic electrical/magnetical models developed for the proposed system.

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快速间歇训练对大学生羽毛球运动员神经肌肉功能的影响

Analysis on the Direct-Driven High Power Permanent Magnet Generator for Wind Turbine

第十三届全国体育科学大会

作者：唐永泉韩玉彬 Seung-soo baek 信阳师范学院河南理工大学 Sangmyung University

研究目的:随着大学生羽毛球运动在国内外开展的越来越普及,羽毛球比赛尤其是高水平紧张而激烈的对抗,技术水平越来越接近,比赛进入僵持阶段时,不仅仅需要良好的心理素质,更要有良好的体能保障,特别是神经肌肉的最大力量和爆发力,更能决... 详细信息

研究目的:随着大学生羽毛球运动在国内外开展的越来越普及,羽毛球比赛尤其是高水平紧张而激烈的对抗,技术水平越来越接近,比赛进入僵持阶段时,不仅仅需要良好的心理素质,更要有良好的体能保障,特别是神经肌肉的最大力量和爆发力,更能决定比赛的胜负,运动训练对神经肌肉功能的影响,在国际上也有诸多研究。研究发现,神经肌肉功能有关的周围因素在专项运动表现中也起着至关重要的作用,训练也可以引起激活后增强(PAP)反应,从而使个体在随后的锻炼中产生更多的力量,训练在涉及运动表现的相关研究中,发现全身振动刺激可使峰值力矩(Peak Torque,PT)及下蹲跳(Counter Movement Jump,CMJ)表现增加,PT增加可能代表α运动神经元池的兴奋性受到抑制,CMJ表现进步亦代表牵张反射能力提升,γ反射弧兴奋性增加。研究表明神经肌肉功能在专项运动中起着至关重要的作用。而目前学界针对快速间歇性训练对大学生羽毛球运动员训练研究着墨较少。鉴于此,本文采1RM(one Maximum Strength)、CMJ(Counter Movement Jump)、DJ(Drop Jump)为测试内容对实验组和对照组的学生进行干预前后的测试,探讨10周快速间歇训练对大学生羽毛球运动员的神经肌肉功能产生的变化。研究方法:这项研究以男子大学生羽毛球运动员(n=32)为研究象,分为实验组16名运动员和对照组16名运动员。始于2021年10月,持续了11周,包括3个部分:1周的准备训练及前测试;10周的训练干预;以及后测试。每周一三五训练,每天下午18点开始训练。为确保研究的可信度,研究初期进行了1周的准备训练及前测,干预训练10周。本实验共分为三个周期(1适应期2强化期3维持期),并将各个周期的动作在前阶段的动作的基础上增加量和强度。运动时间根据ACSM提出的建议,准备部分10分钟,基本部分50分钟,整理部分10分钟,共进行70分钟。在该研究中,运动的强度使用了被称为储备心率(Heart Rate Reserve,HRR)法和Tanaka法确定参与者目标心率活动范围,有氧训练组(60%-70%HRmax),无氧训练组((80%-90%HRmax)。最大摄氧量(HRmax)=208-0.7×年龄。目标心率(THR)=(HRmax-HRrest)×运动强度(%)+HRrest。稳定时的心率(HRrest)在休息室以舒适的姿势稳定30分钟,然后将食指和中指轻轻地放在距离手腕起始部位约2.4公分的部位,测试桡动脉60秒,训练前全部测试参与者的目标心率范围。为有效监测训练者的运动强度,利用间歇时间测试桡动脉与Borg主观疲劳感觉分级(RPE)量表运动强度观测法并行对目标心率(Target Heart Rate,THR)进行监测。准备活动是把身体的机能从稳定状态慢慢引导到适合运动的状态的过程,它是一种心理稳定;可起到提高呼吸循环功能,增加氧输送效率,防止肌腱隔热,增加窄应性等效果,使人体的诸功能达到运动适应状态。基本运动有利用自身体重的方法和利用重量及重量器具的方法,但应用效果及测量结果的客观性;可比性(Seguin&Nelson,2003);运动是全身性的先大肌肉运动后小肌肉运动;出于实际原因,选择了重复程序而不是非重复程序,(Paulsen et al.,2014)。为了确保实验过程操作的一致性,为保障实验过程训练质量,实验过程聘请了8名教学经验丰富中级教练员。其中4名教练员负责实验组,另4名教练员负责对照组,每名教练员负责4名受试者,实验组和对照组分别进行统一的训练内容、训练流程、训练方法手段、受试者活动形式(间歇时间、练习内容、练习强度、练习组数以及击球数)等影响训练的因素,保障实验过程的一致性。采用其中8块标准化场地。整理运动是让人体安全地回到稳定状态。肌肉温度高时的伸展对柔韧性的提高是有效的,它能将亢进的功能引导到稳定状态。对照组在日常训练中进行了击球技术训练,例如:高远球、吊球、杀球、推球、勾球、搓球、挑球等。强度:可达到最大强度的80%,在进行了准备训练周及10周训练干预之后,分别测量了运动员的神经肌肉功能(1RM、CMJ、DJ和RSI)的得分。本研究的所有资料处理均利用SPSS26.0统计程序计算出羽毛球运动员10周快速间歇训练的对照组和实验组的神经肌肉功能测试指标的平均数和标准偏差。为分析各群体训练时间的差异,进行了t检验。为了验证认知功能检查的不同时期及组间变化,利用二元重复测量方差(2x2重复双向ANOVA)进行了分析,统计分析的显著性水平为α=.05。研究结果:通过快速间歇训练干预,神经肌肉功能各变量经二元重复测量方差分析的结果中显示,最大肌肉力量(one Repetition Maximum,1RM,p<.01)、反向跳跃(Counter Mo

关键词：快速间歇训练大学生羽毛球运动员神经肌肉功能

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Analysis on the Direct-Driven High Power Permanent Magnet Ge...

区段截骨即刻复位结合正畸精细调整治疗恒磨牙阻生：临床病例报告

2005国际电机与系统学术会议

作者： Ki-Chan Kim Seung-Bin Lim Ki-Bong Jang Sung-Gu Lee Ju Lee Yeoung-Gyu Son Young-Kil Yeo soo-Hyun baek Department of Electrical Engineering Hanyang University Seoul133-791Korea Department of Electrical Engineering Hanyang University Seoul133-791Korea Department of Electrical Engineering Hanyang University Seoul133-791Korea Department of Electrical Engineering Hanyang University Seoul133-791Korea Department of Electrical Engineering Hanyang University Seoul133-791Korea Department of Motor Development LG Innotek Co. LTDGwangJu506-731Korea Department of R＆D SPG Co. LTDInchon425-020Korea Department of Electrical Engineering Dongguk University Seoul 100-715 Korea

＜正＞In this paper, the permanent magnet synchronous generator of 1.5MW output power which is driven directly without gear system is designed by conventional magnetic equivalent circuit method and analyzed by finite element method for verification of design. We analyzed the characteristics of generator like no load, rated load, short circuit condition and demagnetization of permanent magnet. The last, the analysis results of two kinds of rotor types are compared with each other. Especially the THD （total harmonic distortion） of output voltage is examined for the comparison.

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中国口腔医学继续教育杂志 2011年第2期14卷 104-113页

作者： Yoon-Goo Kang Ji-Yong Kim Young-Jun Lee baek-soo Lee 禹洁（译）姜若萍（审）不详北京大学口腔医学院正畸科北京市中关村南大街22号100081

恒牙萌出紊乱对临床医师来说是一个挑战．如后牙阻生引起的侧方开骀即可能严重影响患者的咬合功能。本病例报告介绍了一种通过外科区段截骨结合正畸精细调整治疗恒磨牙阻生的方法。采用一步或两步法单牙区段截骨术．将两颗处于不同萌出... 详细信息

恒牙萌出紊乱对临床医师来说是一个挑战．如后牙阻生引起的侧方开骀即可能严重影响患者的咬合功能。本病例报告介绍了一种通过外科区段截骨结合正畸精细调整治疗恒磨牙阻生的方法。采用一步或两步法单牙区段截骨术．将两颗处于不同萌出阶段的阻生恒磨牙复位到骀平面，术后再通过正畸手段将牙一牙槽骨段调整到理想的咬合位置。

关键词：区段截骨牙齿萌出紊乱牙齿骨粘连

Memristive Devices Based on Two-Dimensional Transition Metal Chalcogenides for Neuromorphic Computing

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Nano-Micro Letters 2022年第4期14卷 29-58页

作者： Ki Chang Kwon Ji Hyun baek Kootak Hong soo Young Kim Ho Won Jang Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoul 08826Republic of Korea Interdisciplinary Materials Measurement Institute Korea Research Institute of Standards and Science(KRISS)Daejeon 34133Republic of Korea Department of Materials Science and Engineering Institute of Green Manufacturing TechnologyKorea UniversitySeoul 02841Republic of Korea Advanced Institute of Convergence Technology Seoul National UniversitySuwon 16229Korea

Two-dimensional(2D)transition metal chalcogenides(TMC)and their heterostructures are appealing as building blocks in a wide range of electronic and optoelectronic devices,particularly futuristic memristive and synaptic devices for brain-inspired neuromorphic computing *** distinct properties such as high durability,electrical and optical tunability,clean surface,flexibility,and LEGO-staking capability enable simple fabrication with high integration density,energy-efficient operation,and high *** review provides a thorough examination of high-performance memristors based on 2D TMCs for neuromorphic computing applications,including the promise of 2D TMC materials and heterostructures,as well as the state-of-the-art demonstration of memristive *** challenges and future prospects for the development of these emerging materials and devices are also *** purpose of this review is to provide an outlook on the fabrication and characterization of neuromorphic memristors based on 2D TMCs.

关键词： Two-dimensional materials Memristors Neuromorphic computing Artificial synapses Transition metal chalcogenides