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Journal of Magnesium and Alloys 2019年第4期7卷 707-716页

作者： M.sabbaghian R.Mahmudi k.s.shin school of Metallurgical and Materials Engineering College of EngineeringUniversity of TehranTehran 14395-515Iran Magnesium Technology Innovation Center School of Materials Science and EngineeringSeoul National University1 Gwanak-roGwanak-guSeoul 08826Republic of Kore

Microstructure,texture,mechanical properties and corrosion behavior of the extruded Mg-4Zn alloy,as a biodegradable material,were investigated.A refined microstructure caused by dynamic recrystallization(DRX),and a general fiber texture were achieved after *** properties along different directions of the extruded samples were investigated using shear punch test(sPT).The shear yield stress(sYs)of 113.8 MPa obtained in the transverse direction(TD)was higher than the 106 MPa achieved for the extruded direction(ED)and 45˚*** was attributed to the higher amounts of twins and also lower schmid factor(sF)in the *** the other hand,encouraged activation of the basal slip system in the 45˚samples resulted in improved room temperature formability,as indicated by the normalized displacement in the sPT *** back scattered diffraction(EBsD)analysis of the surfaces corroded in the phosphate buffered saline(PBs)solution,showed that despite having similar grain sizes and second phase particles shape and volume fractions,surfaces containing grains near(0001)orientations and extension twins(TD and 45˚samples)have lower corrosion rates,as compared to the ED specimens.

关键词： Mg-Zn alloy Corrosion rate Dynamic recrystallization Texture Twinning

Low cycle fatigue properties and cyclic deformation behavior of as-extruded AZ31 magnesium alloy

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Transactions of Nonferrous Metals society of China 2010年第B07期20卷 533-539页

作者： s.kWON k.sONG k.s.shin s.I.kWUN Department of Materials science and Engineering Korea University school of Materials science and Engineering Seoul National University

The low cycle fatigue(LCF)properties of as-extruded AZ31 Mg alloy were investigated under total strain amplitudes in the range of 0.4%-1.2%with strain rate of 1×10- 2s -*** to the twinning effect in compression during loading and the detwinning effect during unloading,the alloy showed an asymmetric hysteresis *** cyclic stress response exhibited cyclic hardening at high total strain *** cyclic deformation behaviors were discussed using the Coffin-Manson plot,which divided the plastic strain amplitudes into the tension side and the compression *** the LCF tests that were started from either tension or compression under a total strain amplitude of 1.0%,the interaction between the twinning effect and dislocation was *** twinning effect during the LCF test and the variation of the dislocation density were investigated using optical microscopy and transmission electron microscopy,respectively.

关键词： AZ31 magnesium alloy low cycle fatigue twinning dislocation

A study on The Effects of Foreign Materials on The sG Tubing

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A Study on The Effects of Foreign Materials on The SG Tubing

17th World Conference on Non-Destructive Testing

作者： J.A.Park s.G.Cho k.s.shin UMI Inc. DaejonS.KOREA korea Hydro & Nuclear Power Co. LtdDaejonS.KOREA

＜正＞The integrity of the steam Generator （sG） tubes is challenged by numerous factors,such as flaws,operation atmosphere,inherently degraded materials,and even human *** the factors,foreign materials on the secondary side of the tubes can cause volumetric defects and even leakage from the primary to the secondary side with an extremely rapid growth rate of *** order to prevent this catastrophic event,it is imperative to detect and characterize the foreign

关键词： Eddy current testing steam generator Foreign materials

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2090Al-Li合金的氢脆

宇航材料工艺 1991年第1期21卷 55-58页

作者： k.s.shin s.s.kin E.W.Lee 谭澄宇

众所周知,在其它传统高强铝合金已观察过的浸蚀环境中,氢气在 Al-Li 合金力学性能降低上扮演着一个重要的角色。在本研究中,通过充氢样品的拉伸试验,检测了氢对2090Al-Li 合金力学性能的影响。在 HCl 溶液中,对拉伸样品采用阴极充氢并... 详细信息

众所周知,在其它传统高强铝合金已观察过的浸蚀环境中,氢气在 Al-Li 合金力学性能降低上扮演着一个重要的角色。在本研究中,通过充氢样品的拉伸试验,检测了氢对2090Al-Li 合金力学性能的影响。在 HCl 溶液中,对拉伸样品采用阴极充氢并在不同的温度和应变速率下进行试验。发现:氢的影响随着充氢的时间增加而增大,但随试验温度下降而减小;还发现:在293k 处,随着应变速率的下降,氢的影响增加。

关键词：铝锂合金氢脆材料性能

The planar loght waveguide type optical amplifier fabricated by sputtering method

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The planar loght waveguide type optical amplifier fabricated...

蛋氨酸螯合铁添加水平和添加时间对肉鸡肉中铁含量的影响

亚太地区通信会议暨光电子通信会议

作者： Y.B.Choi s.J.Park k.s.shin k.T.Jeong s.H.Cho D.C.Moon Access network laboratory korea Telecom.62-1 Whaam-dong Yusung-gu Taejeon korea Access network laboratory korea Telecom.62-1 Whaam-dong Yusung-gu Taejeon korea Access network laboratory korea Telecom.62-1 Whaam-dong Yusung-gu Taejeon korea Access network laboratory korea Telecom.62-1 Whaam-dong Yusung-gu Taejeon korea Access network laboratory korea Telecom.62-1 Whaam-dong Yusung-gu Taejeon korea kwangWoon University Electronic Materials Engineering 447-1 Wolgye-dong Nowon-gu seoul

The planar ligh waveguide type optical amplifier was designed and fabricated. For the fabrication of opticalamplifier,the core layer of Er-doped siO glass was deposited onto silica cladding layer by RF sputtering method withdeposition rate 55（?）/min. The average Er concentration of the deposited film was 0.77wt%.Using input signal power-20dBm of laser diode with 1546nm wavelength, gain of the optical amplifier was 5dB with incident pump power of200mW.

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饲料与畜牧（新饲料） 2014年第3期 56-59页

作者： s.H.seo H.k.Lee W.s.Lee k.s.shin I.k.Paik 吉隆达集团技术中心吉隆达集团技术中心

试验在肉鸡饲粮中补充蛋氨酸螯合亚铁，考察添加水平和添加时间对鸡肉中铁、铜、锌含量的影响。250只刚孵化的罗斯（ROss）肉仔鸡被随机分配到5个饲粮处理组。每个处理组5个重复，每个重复10只鸡（公母各半）。试验鸡采用笼养，饲喂传... 详细信息

试验在肉鸡饲粮中补充蛋氨酸螯合亚铁，考察添加水平和添加时间对鸡肉中铁、铜、锌含量的影响。250只刚孵化的罗斯（ROss）肉仔鸡被随机分配到5个饲粮处理组。每个处理组5个重复，每个重复10只鸡（公母各半）。试验鸡采用笼养，饲喂传统肉鸡饲粮，自由采食5周。饲粮处理如下：对照组和两个Fe-Met水平组（Fe：1OOmg／kg或200mg／kg），试验全期（0～5周）和生长期（4～5周）补充Fe-Met。结果表明，饲粮处理对生长性能没有显著影响。随着Fe--Met添加水平和添加时间的增加，肌肉（胸脯、腿肌、翼肌）和器官（肝脏和脾脏）中的铁含量显著增加（P〈***）。全期饲喂Fe-Met200组铁浓度最高。肝脏中铁浓度最高，其次是脾脏、腿肌、翼肌和胸肌。与全期饲喂Fe-Met100相比，生长期补充Fe-Met200使肝脏和脾脏中铁浓度更高；而肌肉（胸肌、腿肌和翼肌）中铁浓度更低。为了使肌肉中铁浓度最高，应该全期（5周）补充Fe--Met200。补充Fe-Met能增加所有肌肉（除翼肌）和器官中的铜浓度。补充Fe-Met200，胸肌和翼肌的锌浓度降低，但腿肌、肝脏和脾脏中的锌浓度有增加趋势。Fe-Met对肌肉颜色没有显著影响。但是，全期补充Fe--Met有增加腿肌和胸肌红色度，腿部和胸肌黄色度的趋势。研究结论：连续5周补充Fe-Met200能有效增加肌肉中铁的含量。

关键词：蛋氨酸螯合亚铁富铁肉肉鸡铜锌

Cross-Domain Bilateral Access Control on Blockchain-Cloud Based Data Trading system

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Computer Modeling in Engineering & sciences 2024年第10期141卷 671-688页

作者： Youngho Park su Jin shin sang Uk shin Electronics and Information Communications Research Center Pukyong National UniversityBusan48513Republic of Korea Department of Information security Graduate SchoolPukyong National UniversityBusan48513Republic of Korea Division of Computer Engineering Pukyong National UniversityBusan48513Republic of Korea

Data trading enables data owners and data requesters to sell and purchase *** the emergence of blockchain technology,research on blockchain-based data trading systems is receiving a lot of ***,to reduce the on-chain storage cost,a novel paradigm of blockchain and cloud fusion has been widely considered as a promising data trading ***,the fact that data can be used for commercial purposes will encourage users and organizations from various fields to participate in the data *** the data marketplace,it is a challenge how to trade the data securely outsourced to the external cloud in a way that restricts access to the data only to authorized users across multiple *** this paper,we propose a cross-domain bilateral access control protocol for blockchain-cloud based data trading *** consider a system model that consists of domain authorities,data senders,data receivers,a blockchain layer,and a cloud *** proposed protocol enables access control and source identification of the outsourced data by leveraging identity-based cryptographic *** the proposed protocol,the outsourced data of the sender is encrypted under the target receiver’s identity,and the cloud provider performs policy-match verification on the authorization tags of the sender and receiver generated by the identity-based signature ***,data trading can be achieved only if the identities of the data sender and receiver simultaneously meet the policies specified by each *** demonstrate efficiency,we evaluate the performance of the proposed protocol and compare it with existing studies.

关键词： Bilateral access control blockchain data sharing policy-match

NADPH oxidase 4(NOX4)as a biomarker and therapeutic target in neurodegenerative diseases

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Neural Regeneration Research 2024年第9期19卷 1961-1966页

作者： Napissara Boonpraman sun shin Yi Bk21 four Program Department of Medical SciencesSoonchunhyang UniversityAsanSouth Korea Department of Biomedical Laboratory science Soonchunhyang UniversityAsanSouth Korea iConnectome Co.Ltd.CheonanSouth Korea

Diseases like Alzheimer’s and Parkinson’s diseases are defined by inflammation and the damage neurons undergo due to oxidative stress. A primary reactive oxygen species contributor in the central nervous system, NADPH oxidase 4, is viewed as a potential therapeutic touchstone and indicative marker for these ailments. This in-depth review brings to light distinct features of NADPH oxidase 4, responsible for generating superoxide and hydrogen peroxide, emphasizing its pivotal role in activating glial cells, inciting inflammation, and disturbing neuronal functions. significantly, malfunctioning astrocytes, forming the majority in the central nervous system, play a part in advancing neurodegenerative diseases, due to their reactive oxygen species and inflammatory factor secretion. Our study reveals that aiming at NADPH oxidase 4 within astrocytes could be a viable treatment pathway to reduce oxidative damage and halt neurodegenerative processes. Adjusting NADPH oxidase 4 activity might influence the neuroinflammatory cytokine levels, including myeloperoxidase and osteopontin, offering better prospects for conditions like Alzheimer’s disease and Parkinson’s disease. This review sheds light on the role of NADPH oxidase 4 in neural degeneration, emphasizing its drug target potential, and paving the path for novel treatment approaches to combat these severe conditions.

关键词： Alzheimer’s disease astrocytes mitochondrial dysfunction myeloperoxidase NADPH oxidase 4 NADPH oxidase 4 inhibitors neurodegenerative diseases osteopontin Parkinson’s disease reactive oxygen species

Modeling asymmetric fracture mechanics of Mg alloy wire in drawing process

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Journal of Magnesium and Alloys 2024年第5期12卷 2057-2069页

作者： sunghoon Choi Jongwon shin Joung sik suh Dongchoul kim Department of Mechanical Engineering Sogang UniversitySeoul04107Republic of Korea Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

In this study,a numerical analysis was conducted on the ductile fracture of a 2-mm diameter Mg-1Zn-0.5Mn-0.5sr-0.1Ca alloy wire during *** hexagonally close-packed crystal structure of Mg alloys causes asymmetric fracture behavior,especially in the compression *** aim of this study is to develop a comprehensive damage model for Mg alloy wire that accurately predicts ductile fracture,with a focus on the compression region.A novel experimental method was introduced to measure the ductile fracture of Mg alloy wires under different stress *** wire drawing process was simulated using the Generalized Incremental stress-state dependent damage(GIssMO)Model and the semi-Analytical Model for Polymers(sAMP)*** damage model's prediction and the experimental results were found to be in excellent agreement,especially in determining crack *** analysis established a safe zone diagram for die angle and reduction ratio,and experimental validation confirmed the feasibility of this *** proposed damage model can provide a practical and reliable analysis for optimizing the drawing process of Mg alloy wire.

关键词： Mg alloy Wire drawing Finite element method Damage model safe zone diagram

Natural Convection Melting in a Rectangular Heat storage Tank of Carbon Nanotube Dispersed Latent Heat storage Material

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Journal of Thermal science 2024年第3期33卷 847-855页

作者： shin-ichi MORITA Tomoya sAITO kazunori TAkAI Yasutaka HAYAMIZU Naoto HARUkI Division of Mechanical and Electrical Engineering Kitami Institute of Technology165 Koen-choKitami-shiHokkaido090-8507Japan National Institute of Technology Yonago College4448 Hikona-cyoYonago-shiTottori683-8502Japan Okayama Prefectural University 111 KubokiSoja-shiOkayama719-1197Japan

A dispersion system fluid can convect even if the dispersoid is a solid ***,heat exchange performance can be improved while maintaining fluidity using a material with high thermal conductivity as the *** study presents the melting performance evaluation results of a latent heat storage material with a carbon nanotube(CNT)dispersion system with high thermal conductivity,which enhances the thermal conductivity of the latent heat storage material and does not limit free *** the thermal conductivity and enhancing the melting convection of the heat storage material result in increased latent heat storage *** this study,the thermal conductivity of the latent heat storage material was successfully increased by dispersing CNTs in the *** 0.1%(in mass)of multi-wall CNT(MWCNT)was dispersed in a paraffin-based latent heat storage material,the shear stress increased by 1.5 times at a shear rate of 500 s^(-1),while taking into account the potential effects of convective ***,a latent heat storage experiment was conducted in a rectangular heat storage tank using the CNT dispersion composition ratio as a parameter.A rectangular vessel with a heated vertical surface was used for the latent heat storage *** melting speed was determined by comparing the amount of latent heat stored in a CNT-dispersed latent heat storage material and a single-phase latent heat storage material *** experimental results show that the time required for the latent heat storage material to completely melt in the heat storage tank was the shortest for the single-phase latent heat storage material ***,the fastest melting progress was observed for the sample with 0.02%(in mass)MWCNT content in the melting rate range of up to approximately 40%in the *** results indicate that this phenomenon is caused by the difference in the melting rates in the upper part of the *** generated data are useful for det

关键词： latent heat storage phase change carbon nano tube free convection heat transfer