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Friction Behavior of Magnetorheological Fluids with Different Material Types and Magnetic Field Strength

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Chinese Journal of Mechanical Engineering 2016年第1期29卷 84-90页

作者： ZHANG Peng LEE kwang-hee LEE Chul-hee Department of Mechanical Engineering Inha University

Magnetorheological （MR） fluid is a type of a smart material that can control its mechanical properties under a magnetic field. Iron particles in MR fluid form chain structures in the direction of an applied magnetic field, which is known as MR effect, resulting in variation of stiffness, shear modulus, damping and tribological characteristics of MR fluid. As MR effect depends on the density of particles in the fluid or the strength of a magnetic field, the experiments are conducted to evaluate the friction property under reciprocating motion by changing the types of MR fluid and the strength of a magnetic field. The material of aluminum, brass, and steel are chosen for specimen as they are the most common material in mechanical applications. The surfaces of specimen are also observed by optical microscope before and after experiments to compare the surfaces with test conditions. The comparing results show that the friction coefficient increases as the strength of a magnetic field increases in regardless of types of MR fluid or the material. Also the density of particle in MR fluid affects the friction characteristic. The results from this research can be used to improve the performance of mechanical applications using MR fluid.

关键词： Magnetorheological (MR) fluid friction characteristics smart material magnetic field

4-1BB-4-1BBL cis-interaction contributes to the survival of selfreactive CD8^(+)T cell

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Cellular & Molecular Immunology 2023年第9期20卷 1077-1080页

作者： Eunjung Cho Rohit Singh Chungyong Han Seon-hee kim kwang H.kim Bo-Mi Park Dong Hoon Shin Seongeun Han Young H.kim Byoung S.Kwon Ki Taek Nam Beom K.Choi Immuno-oncology Branch Division of Rare and Refractory CancerNational Cancer CenterGoyang 10408Republic of Korea Severance Biomedical Science Institute Brain Korea 21 Project for Medical ScienceYonsei University College of MedicineSeoulRepublic of Korea Department of Cancer Biomedical Science Graduate School of Cancer Science and PolicyNational Cancer CenterGoyang 10408Republic of Korea Department of Biomedical Laboratory Science Catholic Kwandong UniversityGangneung 25601Republic of Korea Biomedicine Production Branch Research InstituteNational Cancer CenterGoyang 10408Republic of Korea Anticancer Resistance Branch Division of Rare and Refractory CancerResearch InstituteNational Cancer CenterGoyang 10408Republic of Korea Eutilex Co. Ltd.Geumcheon-guSeoul 08594Republic of Korea Department of Medicine Tulane University Health Sciences CenterNew OrleansLA 70112USA Innobationbio Co. Ltd.Mapo-guSeoul 03929Republic of Korea

4-1BB is an inducible receptor expressed on activated T cells,while its ligand,4-1BBL,is mainly expressed in antigen-presenting cells and macrophages[1,2].To the best of our knowledge,ligandmediated transactivation of... 详细信息

关键词： interaction activation knowledge

A Review on Interface Engineering of MXenes for Perovskite Solar Cells

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Nano-Micro Letters 2023年第8期15卷 270-308页

作者： Srikanta Palei G.Murali Choong‑hee kim Insik In Seul‑Yi Lee Soo‑Jin Park Department of Chemistry Inha University100 InharoIncheon 22212South Korea Department of Polymer Science and Engineering Department of IT‑Energy Convergence(BK21 Four)Chemical Industry InstituteKorea National University of TransportationChungju 27469South Korea

With an excellent power conversion efficiency of 25.7%,closer to the Shockley–Queisser limit,perovskite solar cells(PSCs)have become a strong candidate for a next-generation energy ***,the lack of stability and reliability in PSCs remained challenging for ***,such as interfacial and structural engineering,have a more critical influence on enhanced ***,two-dimensional materials,have emerged as promising materials in solar cell applications due to their metallic electrical conductivity,high carrier mobility,excellent optical transparency,wide tunable work function,and superior mechanical *** to different choices of transition elements and surface-terminating functional groups,MXenes possess the feature of tuning the work function,which is an essential metric for band energy alignment between the absorber layer and the charge transport layers for charge carrier extraction and collection in ***,adopting MXenes to their respective components helps reduce the interfacial recombination resistance and provides smooth charge transfer paths,leading to enhanced conductivity and operational stability of *** review paper aims to provide an overview of the applications of MXenes as components,classified according to their roles as additives(into the perovskite absorber layer,charge transport layers,and electrodes)and themselves alone or as interfacial layers,and their significant importance in PSCs in terms of device performance and ***,we discuss the present research status and future directions toward its use in PSCs.

关键词： MXenes Perovskite solar cells Additives Interfacial layer Electrodes

Formation of photo-reactive heterostructure from a multicomponent amorphous alloy with atomically random distribution

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Journal of Materials Science & Technology 2022年第14期109卷 245-253页

作者： Hae Jin Park hee Jin Lee Tae Kyung kim Sung Hwan Hong Wei-Min Wang Taek Jib Choi Ki Buem kim Department of Nanotechnology and Advanced Materials Engineering Sejong University209 Neung dong-roGwangjin-guSeoul 05006Republic of Korea Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationShandong UniversityJinan 250061China

In this study,metallic glass is designed tunable for promising functional applications via a facile and stable,one-step *** approach about alloy design and process is based on the unique properties of the Ti-Cu-Ni-Sn metallic glass that are afforded by the varying oxygen affinities of the four constituent *** metallic glass exhibits homogeneous nucleation of oxides and uniform formation of the various metal *** alloy design and hydrothermal synthesis to customize the metallic glasses are the most critical factors that determine the characteristics of the metal oxides and the resulting nanostructures and photoelectrode *** enables the desired element to be selectively grown via a facile single-step *** results provide a promising road map for the application of metallic glasses to photoelectrochemical(PEC)solar water splitting,as well as various other new possibilities.

关键词： Metallic glass Alloy design Hydrothermal synthesis Metal oxide Water splitting

COVID-19 pandemic and the cyberthreat landscape:Research challenges and opportunities

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Digital Communications and Networks 2023年第1期9卷 211-222页

作者： Heba Saleous Muhusina Ismail Saleh HAlDaajeh Nisha Madathil Saed Alrabaee kim-kwang Raymond Choo Nabeel Al-Qirim Information Systems and Security College of ITUnited Arab Emirates UniversityAl AinUnited Arab Emirates Department of Information Systems and Cyber Security The University of Texas at San AntonioSan AntonioTX78249USA College of Technological Innovations(CIT) Zayed UniversityUAE

Although cyber technologies benefit our society,there are also some related cybersecurity *** example,cybercriminals may exploit vulnerabilities in people,processes,and technologies during trying times,such as the ongoing COVID-19 pandemic,to identify opportunities that target vulnerable individuals,organizations(e.g.,medical facilities),and *** this paper,we examine the various cyberthreats associated with the COVID-19 *** also determine the attack vectors and surfaces of ***,we will discuss and analyze the insights and suggestions generated by different cyberattacks against individuals,organizations,and systems.

关键词： COVID-19 Cyberattacks Security and privacy Mitigation Potential solutions

Novel Architecture of OneM2M-Based Convergence Platform for Mixed Reality and IoT

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Computers, Materials & Continua 2022年第4期71卷 51-69页

作者： Seungwoon Lee Woogeun Kil Byeong-hee Roh SJ kim Jin-suk Kang Department of Computer Engineering and Department of AI Convergence Network Ajou UniversitySuwon16499Korea Howard R.Hughes College of Engineering University of NevadaLas VegasNV89154USA AST Co.Ltd. Suwon16681Korea

There have been numerous works proposed to merge augmented reality/mixed reality(AR/MR)and Internet of Things(IoT)in various ***,they have focused on their specific target applications and have limitations on interoperability or reusability when utilizing them to different domains or adding other devices to the *** paper proposes a novel architecture of a convergence platform for AR/MR and IoT systems and *** proposed architecture adopts the oneM2M IoT standard as the basic framework that converges AR/MR and IoT systems and enables the development of application services used in general-purpose environments without being subordinate to specific systems,domains,and device *** implement the proposed architecture utilizing the open-source oneM2M-based IoT server and device platforms released by the open alliance for IoT standards(OCEAN)and Microsoft HoloLens as an MR device *** also suggest and demonstrate the practical use cases and discuss the advantages of the proposed architecture.

关键词： Internet of things(IoT) augmented realty(AR) mixed reality(MR) microsoft HoloLens oneM2M convergence platform

A new analytical approach for identifying market contagion

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Financial Innovation 2022年第1期8卷 1097-1131页

作者： hee Soo Lee Tae Yoon kim Department of Business Administration Sejong University209 Neungdong-ro Gwangjin-guSeoul 05006Korea Department of Statistics Keimyung University1095 Dalgubeol-daeroDaegu 704-701Korea.

This study proposed a new analytical approach to identify the excessive comovement of two markets as *** goal is achieved by linking latent-factor and single-equation error correction models and evaluating the breaks in the short-and long-term relationships and correlatedness in the linked *** results demonstrated that a short-term relationship representing the market speed ratio between two markets plays a key role in contagion *** a long-term relationship or correlatedness is broken(comovement change)due to a break in the short-term relationship(market speed ratio),contagion is highly likely and should be formally *** posterior probabilities were calculated to determine the ***,this study applied this analytical Bayesian approach to empirically test the contagion effects of the *** market during the global financial crisis between 2007 and 2009 using 22 developed equity markets.

关键词： Contagion test Market integration Bayesian approach Comovement Market speed ratio

Ultrasound-guided intra-articular corticosteroid injection in a patient with manubriosternal joint involvement of ankylosing spondylitis:A case report

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World Journal of Clinical Cases 2023年第9期11卷 2043-2050页

作者： Min-hee Choi In-Young Yoon Won-Joong kim Department of Anesthesiology and Pain Medicine Ewha Womans University Mokdong HospitalSeoul 07985South Korea

BACKGROUND Manubriosternal joint(MSJ)disease is a rare cause of anterior chest pain but can be a major sign of systemic arthritic *** patients with ankylosing spondylitis(AS),a type of systemic arthritis,chest pain can be due to MSJ involvement and can be improved by ultrasound-guided corticosteroid injection into the *** SUMMARY A 64-year-old man visited our pain clinic complaining of anterior chest *** were no abnormal findings on lateral sternum X-ray,but arthritic changes in the MSJ were observed on single-photon emission computed tomography-computed *** performed additional laboratory tests,and he was finally diagnosed with *** pain relief,we performed ultrasound-guided intra-articular(IA)corticosteroid injections into the *** the injections,his pain nearly *** For patients complaining of anterior chest pain,AS should be considered,and single-photon emission computed tomography-computed tomography can be helpful in *** addition,ultrasound-guided IA corticosteroid injections may be effective for pain relief.

关键词： Ankylosing spondylitis Anterior chest pain Manubriosternal joint Single-photon emission computed tomography-computed tomography Case report

Volumetric fluid analysis of fixed monthly anti-VEGF treatment in patients with neovascular age-related macular degeneration

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International Journal of Ophthalmology(English edition) 2023年第6期16卷 909-914页

作者： Bo hee kim In Boem Chang Hyeong Gon Yu In Hwan Hong Department of Ophthalmology Kangbuk Samsung HospitalSungkyunkwan University School of MedicineSeoul 03181Republic of Korea Seoul On Eye Clinic Seoul 03355Republic of Korea Department of Ophthalmology Seoul National University College of MedicineSeoul National University HospitalSeoul 03080Republic of Korea Retina Center Sky Eye InstituteSeoul 06536Republic of Korea Department of Ophthalmology Dongtan Sacred Heart HospitalHallym University Medical CenterHwaseong-siGyeonggido 18450Republic of Korea

·AIM:To evaluate visual outcomes and changes in fluid after administering monthly anti-vascular endothelial growth factor(VEGF)injections to treat neovascular agerelated macular degeneration(n AMD)with subretinal fluid(SRF)and pigment epithelial detachment(PED).·METHODS:This prospective study included eyes with n AMD previously treated with as-needed anti-VEGF *** patients were treated with six monthly intravitreal injections of *** volumetric segmentation analyses of the SRF and PED were *** main outcome measures included best-corrected visual acuity(BCVA),and SRF and PED volumes.·RESULTS:Twenty eyes of 20 patients were included in this *** the 6-month follow-up,BCVA and PED volume did not change significantly(P=0.110 and 0.999,respectively)but the mean SRF volume decreased from 0.53±0.82 mm3 at baseline to 0.08±0.23 mm3(P=0.002).The absorption rate of the SRF volume was negatively correlated with the duration of previous antiVEGF treatment(P=0.029).Seven of the 20 eyes(35%)showed a fluid-free macula and significant improvement in BCVA(P=0.036)by month 6.·CONCLUSION:Quantifying the SRF can precisely determine the patient’s responsiveness to anti-VEGF treatment of n AMD.

关键词： neovascular age-related macular degeneration anti-vascular endothelial growth factor treatment drug tolerance persistent subretinal fluid volumetric fluid analysis