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Journal of Materials Science & Technology 2023年第35期166卷 208-233页

作者： Sonali Ajay Beknalkar Aviraj Mahadev Teli jae cheol shin Division of Electronics and Electrical Engineering Dongguk University-Seoul30Pildong-roJung-guSeoul 04620South Korea

Metal oxides with one-dimensional(1-D)nanostructures have shown promise as electrode materials for supercapacitors due to their unique properties,such as high aspect ratio,increased interaction between electrode and electrolyte,favourable mechanical strength,and short ion transportation pathways that im-prove the charge-discharge rates of electrons and *** is an effective technique for cre-ating 1-D metal oxide nanostructures that produce highly porous nanofibrous structures with exceptional specific surface areas,predictable pore size distributions,and tunable interconnected *** paper provides a comprehensive review of the literature on electrospun metal oxide nanostructures for superca-pacitors,including the principles and key parameters of electrospinning,an overview of supercapacitors,the charge storage mechanism of electrospun metal oxides,and recent developments in 1-D electrospun nanostructures,from binary to ternary metal *** review also discusses unresolved issues and future directions in this research ***,this paper offers valuable insights into the latest devel-opments,unresolved issues,and prospects of 1-D nanostructured metal oxides fabricated through elec-trospinning for supercapacitor applications,providing a critical analysis of their potential in this rapidly evolving field.

关键词： Electrospinning Supercapacitor Metal oxides New strategies Nanofibers

Parameter estimation for building energy models using GRcGAN

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Building Simulation 2023年第4期16卷 629-639页

作者： Hansol shin cheol-Soo Park Department of Architecture and Architectural Engineering College of EngineeringSeoul National UniversitySeoul08826R.O.Korea Institute of Construction and Environmental Engineering Institute of Engineering ResearchCollege of EngineeringSeoul National UniversitySeoul08826R.O.Korea

Parameter estimation methods can be classified into(1)manual(trial-and-error),(2)numerical optimization(optimization,sampling),(3)Bayesian inference(Bayes filter,Bayesian calibration),and(4)machine learning(generative model).Bayesian calibration has been widely used because it can capture stochastic nature of uncertain ***,the results of Bayesian calibration could be biased by(1)the prior distribution assumed by the expert’s subjective judgment;(2)the likelihood function that cannot always describe the true likelihood;and(3)the posterior distribution approximation method,such as the Markov Chain Monte Carlo,which requires significant computation *** overcome this,a new approach using a generator-regularized continuous conditional generative adversarial network(GRcGAN)is presented in this *** target parameters of the DOE reference building model were *** was trained to estimate uncertain parameters using simulated monthly electricity and gas *** can successfully estimate five uncertain parameters based on 1,000 training data *** proposed approach presents a potential for stochastic parameter estimation.

关键词： generative adversarial networks generative model parameter estimation inverse problem model calibration parameter uncertainty

Enhanced biometric encryption algorithm for private key protection in BioPKI system

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Journal of Central South University 2014年第11期21卷 4286-4290页

作者： cheol-Joo Chae Kwang-Nam Choi Kiseok Choi jae-Soo Kim Yong Ju shin Korea Institute of Science and Technology Information 245 DaehangnoYuseong-gu Daejeon Korea

Protection of private key is the most critical part in public key infrastructure(PKI) system since it depends on the confidentiality of private key. Thread of password detection has been known as the vulnerability in this PKI system. Recently, studies have been conducted on Bio PKI system that uses the biometric information of users in order to replace the password type of private key protection in PKI system. However, Bio PKI system also has vulnerability in that biometric information used for protection of private key cannot be reused once it is stolen or lost. So, we propose the method to protect the private key using FIDSEQi which binds sequence to biometric information. The proposed method enhances reusability of biometric information and presents higher attack complexity than the method of authentication by cross matching single biometric information.

关键词： BioPKI system fingerprint biometric encryption secret share

Segregation of voiced and unvoiced components from residual of speech signal

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Journal of Central South University 2012年第2期19卷 496-503页

作者： JO cheol-woo KIM jae-hee School of Mechatronics Changwon National University

In conventional source-filter models, voiced and unvoiced components were considered independently. However, in practice it was difficult to separate the source into two parts. An actual source consists of a mixture of two sources and the ratio varies according to the content or the intention of speaker. It had been investigated to separate the voiced and unvoiced components for different source models. Source signals were modeled based on the residual signal measured from inverse filtering. Three different source models were assumed. The parameters of each model were optimized for the original speech signal using a genetic algorithm. The resulting parameters were compared in terms of the mel-cepstral distance to the original signal, the spectrogram and the spectral envelope from the synthesized signal. The optimization method achieves an improvement of 15% for the Klatt model, but there is little improvement in the modified residual case.

关键词： voice source model synthesis optimization genetic algorithm

Activation or exhaustion of CD8^(+) T cells in patients with COVID-19

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Cellular & Molecular Immunology 2021年第10期18卷 2325-2333页

作者： Min-Seok Rha Eui-cheol shin Laboratory of Immunology and Infectious Diseases Graduate School of Medical Science and EngineeringKorea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea Department of Otorhinolaryngology Yonsei University College of MedicineSeoulRepublic of Korea.3 The Center for Epidemic PreparednessKAISTDaejeonRepublic of Korea

In addition to CD4^(+)T cells and neutralizing antibodies,CD8^(+)T cells contribute to protective immune responses against SARS-CoV-2 in patients with coronavirus disease 2019(COVID-19),an ongoing pandemic *** patients with COVID-19,CD8^(+)T cells exhibiting activated phenotypes are commonly observed,although the absolute number of CD8^(+)T cells is *** addition,several studies have reported an upregulation of inhibitory immune checkpoint receptors,such as PD-1,and the expression of exhaustion-associated gene signatures in CD8^(+)T cells from patients with ***,whether CD8^(+)T cells are truly exhausted during COVID-19 has been a controversial *** the present review,we summarize the current understanding of CD8^(+)T-cell exhaustion and describe the available knowledge on the phenotypes and functions of CD8^(+)T cells in the context of activation and *** also summarize recent reports regarding phenotypical and functional analyses of SARS-CoV-2-specific CD8^(+)T cells and discuss long-term SARS-CoV-2-specific CD8^(+)T-cell memory.

关键词： CD8^(+)T cell Activation T-cell exhaustion SARS-CoV-2 COVID-19

Corrosion performance of high pressure die-cast Al-6Si-3Ni and Al-6Si-3Ni-2Cu alloys in aqueous NaCl solution

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Transactions of Nonferrous Metals Society of China 2018年第11期28卷 2182-2190页

作者： Srinivasan ARTHANARI jae cheol JANG Kwang Seon shin Research Institute of Advanced Materials School of Materials Science and EngineeringSeoul National UniversityGwanak-guSeoul 08826Kore

The corrosion performance of high pressure die-cast Al？6Si？3Ni （SN63） and Al-6Si-3Ni-2Cu （SNC632） alloys in 3.5%（mass fraction） NaCl solution was investigated. X-ray diffraction （XRD） and microstructural studies revealed the presence of singlephase Si and binary Al3Ni/Al3Ni2 phases along the grain boundary. Besides, the single Cu phase was also identified at the grainboundaries of the SNC632 alloy. Electrochemical corrosion results revealed that, the SNC632 alloy exhibited nobler shift incorrosion potential （φcorr）, lower corrosion current density （Jcorr） and higher corrosion resistance compared to the SN63 *** circuit curve fitting analysis of electrochemical impedance spectroscopy （EIS） results revealed the existence of twointerfaces between the electrolyte and substrate. The surface layer and charge transfer resistance （Rct） of the SNC632 alloy was higherthan that of the SN63 alloy. Immersion corrosion test results also confirmed the lower corrosion rate of the SNC632 alloy andsubstantiated the electrochemical corrosion results. Cu addition improved the corrosion resistance, which was mainly attributed to theabsence of secondary Cu containing intermetallic phases in the SNC632 alloy and Cu presented as single phase.

关键词： die-casting aluminum alloys corrosion polarization electrochemical impedance spectroscopy (EIS)

Effect of CaF2 content in refining slag on formation behavior of spinel inclusion in Ni-Cr-V-alloyed special steel

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Journal of Iron and Steel Research International 2018年第2期25卷 157-163页

作者： jae-hong shin Joo-hyun Park Department of Materials Engineering Hanyang UniversityAnsan 426-791 Korea

The influence of CaF2 content on the formation behavior of spinel inclusions in the Ni-Cr-V-alloyed special steel was presented. The spinel was not formed at CaF2 content lower than 10 wt%. However, it was formed at early stage when the CaF2 content was greater than 30 wt%, followed by a modification to the aluminosilicate-type inclusions. Because the slag was saturated by MgO, the activity of MgO was unity irrespective of CaF2 content in the slag. Thus, Mg was transferred from slag to metal phase. Mg transferred to molten steel reacted with Al2O3-rich inclusions to form ***2O3 spinel. However, the spinel inclusion was modified to aluminosilicate-type inclusions by the reaction with Si and Ca transferred from slag to molten steel about 2-3 h later.

关键词： Spinel inclusion Refining slag CaF2 content Ni-Cr-V-alloyed special steel

Effects of homogenization temperature on microstructure and mechanical properties of high-speed-extruded Mg–5Bi–3Al alloy

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Journal of Magnesium and Alloys 2022年第10期10卷 2833-2846页

作者： jae Won Cha Sang-cheol Jin jae-Gil Jung Sung Hyuk Park School of Materials Science and Engineering Kyungpook National University80 DaehakroDaegu 41566Republic of Korea Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

This study investigates the effects of billet homogenization temperature on the dynamic recrystallization behavior during high-speed extrusion and resultant microstructure and tensile properties of the Mg–5Bi–3Al(BA53,wt%)*** billets homogenized at 350 and450℃(350H and 450H billets)are extruded at a high speed of 69 m/*** 350H billet has a relatively smaller grain size and a higher abundance of fine Mg3Bi2particles compared to the 450H *** extrusion of the 350H billet,enhanced dynamic recrystallization occurs as a result of its finer grains and abundance of particles,while the growth of recrystallized grains is suppressed by the grain-boundary pinning effect of ***,the extruded 350H material is characterized by smaller grains,relatively greater number of Mg3Bi2particles,and a higher internal strain energy than the extruded 450H *** tensile strength of the extruded 350H material is higher than that of the extruded 450H material owing to stronger grain-boundary hardening,particle hardening,and strain hardening *** extruded 350H material also exhibits a higher tensile elongation as its smaller grains inhibit the formation of crack-inducing undesirable twins during *** results from this study demonstrate that a decrease in the homogenization temperature from 450 to 350℃leads to improved strength and ductility in the high-speed-extruded BA53 material.

关键词： Mg–Bi–Al alloy High-speed extrusion Homogenization Dynamic recrystallization Tensile properties

Landscapes of SARS-CoV-2-reactive CD8^(+)T cells:heterogeneity of host immune responses against SARS-CoV-2

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Signal Transduction and Targeted Therapy 2021年第5期6卷 1399-1401页

作者： June-Young Koh Eui-cheol shin Graduate School of Medical Science and Engineering Korea Advanced Institute of Science and Technology(KAIST)DaejeonRepublic of Korea The Center for Epidemic Preparedness KAISTDaejeonRepublic of Korea

In a recent study published in Science Immunology,^Kusnadi et *** single-cell RNA sequencing(scRNA-seq)of SARS-CoV-2-reactive CD8^(+)T cells and reported ***-CoV-2 infection causes COVID-19,which is an ongoing pandemic disease threatening public *** virology of SARS-CoV-2 and immune responses against the virus have been urgently investigated to develop effective measures against *** viral infection,CD84 T cells contribute to elimination of the virus by exerting cytotoxicity against virus-infected cells and producing effector cytokines,whereas neutralizing antibodies interfere with viral entry of host cells.

关键词： al. infection Immunology

Highly efficient and stable solid-state fiber dye-sensitized solar cells with Ag-decorated SiO_(2) nanoparticles

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Nano Research 2021年第8期14卷 2728-2734页

作者： jae Ho Kim Seok-Ju Yoo Daseul Lee Jin Woo Choi Sang-cheol Han Tae In Ryu Hyung Woo Lee Myunghun shin Myungkwan Song Materials Center for Energy Convergence Korea Institute of Materials Science(KIMS)797Changwon-daeroSungsan-guChangwonGyeongsangnam-do51508Republic of Korea CEN Nano.Co.Ltd. Nano Convergence CenterMuan-roBuduk-myeonMiryang-siGyeongsangnam-do50404Republic of Korea Accident Coordination and Training Division National Institute of Chemical Safety(NICS)90Gajeongbuk-roYuseong-guDaejeon34114Republic of Korea Department of Nanoenergy Engineering and Research Center of Energy Convergence Technology Pusan National UniversityBusandaehak-ro 63-2Geumjeong-guBusan 46241Republic of Korea School of Electronics and Information Engineering Korea Aerospace University Goyang-cityGyeonggi-do10540Republic of Korea

Fiber-shaped dye-sensitized solar cells(FDSSCs)represent promising futuristic flexible or wearable power sources,owing to their simple fabrication process,light weight,weavability,and *** with strategies on changing the properties of semiconductor materials,the effects of incorporating silver-embedded SiO_(2) nanoparticles(Ag@SiO_(2)NPs)on the photoanodes of solid-state FDSSCs(SS-FDSSCs)are *** power conversion efficiency(PCE)of SS-FDSSCs with Ag@SiO_(2) NPs reaches 5.38%,which is comparable to the reference(3.98%).The PCEs remain at 95%between-16.9 and 91.7℃,indicating the operational stability of SS-FDSSCs within this temperature *** fabricated SS-FDSSCs,whose radii were 2 mm,maintains more than 90%of their efficiency over 500 bending cycles and 10 washing cycles.

关键词： dye-sensitized solar cells fiber-shaped solar cells SiO_(2)nanoparticles plasmonic effect solid-state electrolyte