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Journal of Materials Science & Technology 2020年第22期54卷 123-130页

作者： Timothy Alexander Listyawan Hyunjong lee Nokeun Park Unhae lee School of Materials Science and Engineering Yeungnam University280 Daehak-roCyeongsanGyeongsangbuk-do 38541Republic of Korea Advanced Process and Materials R&D Group Korea Institute of Industrial TechnologyIncheon 21999Republic of Korea Institute of Materials Technology Yeungnam University280 Daehak-roGyeongsanGyeongsangbuk-do 38541Republic of Korea POSCO Technical Research Laboratories Gwangyang 57807Republic of Korea

In this study, mechanical properties improvement of equiatomic CoCrFeMnNi treated with an ultrasonic nanocrystal surface modification(UNSM) was studied. The applied UNSM treatment with static loads of 10 N, 20 N, and 60 N provided a severe plastic deformation, which produced a gradient structure. The nearsurface area exhibited a high number of dislocation densities and deformation twin interaction, leading to a surface strengthening and hardness improvement of up to 112% than the deformation-free interior region. Increment of dislocation densities and deformation twin formation on the surface also enhanced the yield and ultimate tensile strength of the UNSM-treated specimens. Furthermore, the combination of hard nanocrystallites layer on the surface and ductile coarse grain in the specimen interior as a result of the UNSM treatment successfully maintained the strength–ductility balance of the CoCrFeMnNi.

关键词： High-entropy alloy Ultrasonic nanocrystal surface modification Severe plastic deformation Microstructures Mechanical properties

Flattening the biological age curve by improving metabolic health:to taurine or not to taurine,that’s the question

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Journal of Geriatric Cardiology 2023年第11期20卷 813-823页

作者： Kwok M.Ho Anna lee William Wu matthew T.V.Chan Lowell Ling Jeffrey Lipman Jason Roberts Edward Litton Gavin M.Joynt Martin Wong Department of Intensive Care Medicine Fiona Stanley HospitalPerthAustralia Medical School The University of Western AustraliaPerthAustralia School of Veterinary&Life Sciences Murdoch UniversityPerthAustralia Department of Anaesthesia&Intensive Care Prince of Wales HospitalChinese University of Hong KongHong KongChina Jamieson Trauma Institute Royal Brisbane and Women’s HospitalBrisbaneQueenslandAustralia Division of Anaesthesiology Critical Care Emergency and Pain Medicine Nîmes University HospitalUniversity of MontpellierNîmesFrance University of Queensland Centre for Clinical Research Faculty of MedicineThe University of QueenslandBrisbaneAustralia Herston Infectious Diseases Institute(HeIDI) Metro North HealthBrisbaneAustralia Departments of Pharmacy and Intensive Care Medicine Royal Brisbane and Women’s HospitalBrisbaneAustralia JC School of Public Health and Primary Care Centre for Health Education and Health PromotionChinese University of Hong KongHong KongChina School of Public Health Peking UniversityBeijingChina School of Public Health Fudan UniversityShanghaiChina

The aging population is an important issue around the world especially in developed *** med-ical advances have substantially extended life span,the same cannot be said for the duration of health *** are seeing in-creasing numbers of elderly people who are frail and/or have multiple chronic conditions;all of these can affect the quality of life of the elderly population as well as increase the burden on the healthcare *** is mechanistically related to common medical conditions such as diabetes mellitus,ischemic heart disease,cognitive decline,and frailty.A recently accepted concept termed‘Accelerated Biological Aging’can be diagnosed when a person’s biological age—as measured by biomarkers of DNA methylation—is older than their corresponding chronological ***,a conditionally essential amino acid,has received much attention in the past few years.A substantial number of animal studies have provided a strong scientific foundation sug-gesting that this amino acid can improve cellular and metabolic health,including blood glucose control,so much that it has been labelled one of the‘longevity amino acids’.In this review article,we propose the rationale that an adequately powered random-ized-controlled-trial(RCT)is needed to confirm whether taurine can meaningfully improve metabolic and microbiome health,and biological *** trial should incorporate certain elements in order to provide the much-needed evidence to guide doctors,and also the community at large,to determine whether this promising and inexpensive amino acid is useful in improving human metabolic health.

关键词： rational meaningful Taurine

Next High Performance and Low Power Flash Memory Package Structure

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Journal of Computer Science & Technology 2007年第4期22卷 515-520页

作者： Jung-Hoon lee ERI Control Instrumentation EngineeringGyeongSang National UniversityJinju660-701Korea

In general, NAND flash memory has advantages in low power consumption, storage capacity, and fast erase/write performance in contrast to NOR flash. But, main drawback of the NAND flash memory is the slow access time for random read operations. Therefore, we proposed the new NAND flash memory package for overcoming this major drawback. We present a high performance and low power NAND flash memory system with a dual cache memory. The proposed NAND flash package consists of two parts, i.e., an NAND flash memory module, and a dual cache module. The new NAND flash memory system can achieve dramatically higher performance and lower power consumption compared with any conventionM NAND-type flash memory module. Our results show that the proposed system can reduce about 78% of write operations into the flash memory cell and about 70% of read operations from the flash memory cell by using only additional 3KB cache space. This value represents high potential to achieve low power consumption and high performance gain.

关键词： flash memory NAND-type NOR-type memory localities buffer or cache memory

Generalized polynomial chaos expansion by reanalysis using static condensation based on substructuring

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 819-836页

作者： D.lee S.CHANG J.lee Department of Automotive Engineering Hanyang UniversitySeoul 04763Republic of Korea School of Mechanical Engineering Chungnam National UniversityDaejeon 34134Republic of Korea Department of Mechanical Robotics and Energy EngineeringDongguk UniversitySeoul 04620Republic of Korea

This paper presents a new computational method for forward uncertainty quantification(UQ)analyses on large-scale structural systems in the presence of arbitrary and dependent random *** method consists of a generalized polynomial chaos expansion(GPCE)for statistical moment and reliability analyses associated with the stochastic output and a static reanalysis method to generate the input-output data *** the reanalysis,we employ substructuring for a structure to isolate its local regions that vary due to random *** allows for avoiding repeated computations of invariant substructures while generating the input-output data *** substructuring with static condensation further improves the computational efficiency of the reanalysis without losing ***,the GPCE with the static reanalysis method can achieve significant computational saving,thus mitigating the curse of dimensionality to some degree for UQ under high-dimensional *** numerical results obtained from a simple structure indicate that the proposed method for UQ produces accurate solutions more efficiently than the GPCE using full finite element analyses(FEAs).We also demonstrate the efficiency and scalability of the proposed method by executing UQ for a large-scale wing-box structure under ten-dimensional(all-dependent)random inputs.

关键词： forward uncertainty quantification(UQ) generalized polynomial chaos expansion(GPCE) static reanalysis method static condensation substructuring

What makes the T_c of FeSe/SrTiO_3 so high?

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Chinese Physics B 2015年第11期24卷 23-29页

作者： Dung-Hai lee Department of Physics University of California at Berkeley Material Science Division Lawrence Berkeley National Laboratory

This paper reviews some of the recent progresses in the study of high temperature superconductivity in the interface between a single unit cell FeSe and SrTiO3. It offers the author＇s personal view of why Tc is high ... 详细信息

关键词： high temperature superconductivity

Pyrometallurgical recycling of end-of-life lithium-ion batteries

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1554-1571页

作者： Juheon lee Kwang Won Park Il Sohn Sanghoon lee Department of Materials Science and Engineering Seoul 03722Korea Yonsei Industry Cooperation Center Yonsei UniversitySeoul 03722Korea RD Solution Wanju gunJeollabuk do 55365Korea

The global importance of lithium-ion batteries(LIBs)has been increasingly underscored with the advancement of high-performance energy storage ***,the end-of-life of these batteries poses significant challenges from environmental,economic,and resource management *** review paper focuses on the pyrometallurgy-based recycling process of lithium-ion batteries,exploring the fundamental understanding of this process and the importance of its *** on the high energy consumption and emission gas issues of the pyrometallurgical recycling process,we systematically analyzed the capital-intensive nature of this process and the resulting technological ***,we conducted an in-depth discussion on the future research directions to overcome the existing technological barriers and *** review will provide valuable insights for researchers and industry stakeholders in the battery recycling field.

关键词： spent lithium-ion batteries recycling sustainability lithium valuable metal

Crushed Gold Shell Nanoparticles Labeled with Radioactive Iodine as a Theranostic Nanoplatform for Macrophage-Mediated Photothermal Therapy

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Nano-Micro Letters 2019年第2期11卷 244-257页

作者： Sang Bong lee Jae-Eon lee Sung Jin Cho Jungwook Chin Sang Kyoon Kim In-Kyu lee Sang-Woo lee Jaetae lee Yong Hyun Jeon New Drug Development Center Daegu-Gyeongbuk Medical Innovation FoundationDaeguSouth Korea Department of Biomaterials Science College of Natural Resources and Life Science/Life and Industry Convergence Research InstitutePusan National UniversityPusanSouth Korea Leading-Edge Research Center for Drug Discovery and Development for Diabetes and Metabolic Disease Kyungpook National University HospitalDaegu 702-210South Korea Department of Nuclear Medicine Kyungpook National University HospitalDaegu 702-210South Korea Department of Internal Medicine Kyungpook National University School of MedicineDaegu 700-721South Korea Daegu-Gyeongbuk Medical Innovation Foundation Daegu 360-4South Korea [Laboratory Animal Center Daegu-Gyeongbuk Medical Innovation FoundationDaegu 360-4South Korea

Plasmonic nanostructure-mediated photothermal therapy(PTT) has proven to be a promising approach for cancer treatment,and new approaches for its effective delivery to tumor lesions are currently being *** study aimed to assess macrophage-mediated delivery of PTT using radioiodine-124-labeled gold nanoparticles with crushed gold shells(124I-Au@AuCBs) as a theranostic nanoplatform.124I-Au@AuCBs exhibited effective photothermal conversion effects both in vitro and in vivo and were efficiently taken up by macrophages without *** the administration of 124I-Au@AuCB-labeled macrophages to colon tumors,intensive signals were observed at tumor lesions,and subsequent in vivo PTT with laser irradiation yielded potent antitumor *** results indicate the considerable potential of 124I-Au@AuCBs as novel theranostic nanomaterials and the prominent advantages of macrophage-mediated cellular therapies in treating cancer and other diseases.

关键词： Photothermal therapy Radionuclide crushed gold shell nanoballs Macrophage-mediated delivery

Effect of coating material and lubricant on forming force and surface defects in wire drawing process

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Transactions of Nonferrous Metals Society of China 2011年第A01期21卷 104-110页

作者： S.M.BYON S.J.lee D.W.lee Y.H.lee Y.lee Department of Mechanical Engineering Dong-A University Department of Mechanical Engineering Chung-Ang University Wire Rod Research Group POSCO Technical Research Laboratories

A pilot wire drawing machine as well as wire end-pointing roller was developed. Using these machines, a wire drawing test for four different coating materials and two different lubricants was performed as the reduction ratio increased from 10% to 30%. Materials used for a substrate in this study are plain carbon steel （AIS11045） and ultra low carbon bainite steel. To compute the friction coefficient between the coating layer of wire and the surface of die lbr a specific lubricant, a series of finite element analyses were carried out. SEM observations were also conducted to investigate the surface defects of wire deformed. Results show that the behavior of drawing force varies with the lubricant-type at the initial stage of drawing. The powder-typed lubricant with a large particle causes the retardation of lull lubrication on the entire contact surface and the local delamination of coating layer on the wire surface. As the flow stress of a substrate increases, the delamination becomes severe.

关键词： coating lubricant wire drawing delamination

A Comprehensive Analysis of Datasets for Automotive Intrusion Detection Systems

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Computers, Materials & Continua 2023年第9期76卷 3413-3442页

作者： Seyoung lee Wonsuk Choi InsupKim Ganggyu lee Dong Hoon lee School of Cybersecurity Korea UniversitySeoul02841Korea Memory Division Samsung ElectronicsHwaseong18449Korea

Recently,automotive intrusion detection systems(IDSs)have emerged as promising defense approaches to counter attacks on in-vehicle networks(IVNs).However,the effectiveness of IDSs relies heavily on the quality of the datasets used for training and *** the availability of several datasets for automotive IDSs,there has been a lack of comprehensive analysis focusing on assessing these *** paper aims to address the need for dataset assessment in the context of automotive *** proposes qualitative and quantitative metrics that are independent of specific automotive IDSs,to evaluate the quality of *** metrics take into consideration various aspects such as dataset description,collection environment,and attack *** paper evaluates eight commonly used datasets for automotive IDSs using the proposed *** evaluation reveals biases in the datasets,particularly in terms of limited contexts and lack of ***,it highlights that the attacks in the datasets were mostly injected without considering normal behaviors,which poses challenges for training and evaluating machine learning-based *** paper emphasizes the importance of addressing the identified limitations in existing datasets to improve the performance and adaptability of automotive *** proposed metrics can serve as valuable guidelines for researchers and practitioners in selecting and constructing high-quality datasets for automotive security ***,this paper presents the requirements for high-quality datasets,including the need for representativeness,diversity,and balance.

关键词： Controller area network(CAN) intrusion detection system(IDS) automotive security machine learning(ML) dataset

FEA technique of hot plate forming process using cell-typed die with cooling device

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中国有色金属学会会刊：英文版 2012年第S3期22卷 831-837页

作者： Jung-Min lee In-Kyu lee Kyung-Hun lee Dae-Soon KIM Byung-Min KIM Dongnam Regional Division Korea Institute of Industrial Technology School of Mechanical Engineering Pusan National University Industrial Technology Division Hyundai Heavy Industries

Hot plate forming using a cell-typed die is a process for forming a large thick plate with a spherical shape for the manufacture of a large spherical LNG ***-typed upper and lower dies made of a framework of steel plates fitted to make a grid pattern are used in this process,and an air-cooling device is separately installed inside the lower die.A finite element analysis (FEA) technique was developed,which included hot forming,air flow,cooling and thermal deformation analysis for the hot plate forming process using the cell-typed ***,the convective and interface heat transfer coefficients were used to reproduce analytically the effects of the cooling device in the hot plate forming analysis.A small-scale model test of the process was conducted to verify the FEA *** analysis results show that the curvature of the final plate agrees well with that of the designed experiment within a maximum relative error of 0.03% at the corner of the plate.

关键词： cell-typed die hot plate forming spherical LNG tank heat transfer coefficient