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Effect of Co-Deposited Iron on Microstructures and Properties of Electroplated Nanocrystalline Nickel-Iron Alloys

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Journal of Rare Earths 2006年第z1期24卷 94-99页

作者： Myung Hwan Byun jin woo cho Beom Suck Han Young Keun Kim Yo Seung Song Department of Materials Engineering Hankuk Aviation University 200-1 Goyang Korea Nano Technology Based Information & Energy Storage Research Center Korea Electronics Technology Institute Bundang-gu Seongnam-Si 463-816 Korea Department of Materials Science and Engineering Korea University Seoul 136-713 Korea Materials and Processing Research Team Korea Automobile Technology Institute Chonan Chungnam 330-912 Korea Department of Materials Science and Engineering Korea University Seoul 136-713 Korea Department of Materials Engineering Hankuk Aviation University 200-1 Goyang Korea

Nickel-iron nanocrystalline alloys with different compositions and grain sizes were fabricated by electroplating for MEMS devices. The iron content of the deposits was changed by varying the nickel/iron ion ratio in the electrolyte. X-ray diffraction (XRD) analysis was applied for measuring the strength of the texture and grain size of the deposits. The nickel/iron atom ratio of the deposits was analyzed by EDS. The hardness of the alloys was evaluated by Vickers hardness indenter. The internal stress of the deposits was measured by thin film stress measurement using Stoney's formula. Surface morphology and roughness were investigated by scanning electron microscopy (SEM) and atomic force microscopy (AFM). Hardness and internal stress mechanism of the electroplated structure as a function of Fe ion content and current density were revealed. With increasing the iron content, the hardness and internal stress of the deposits increase. An excellent correlation between the increase in the internal stress and the loss of (200) texture were found.

关键词： MEMS electroplating nanocrystalline nickel-iron alloy grain size internal stress hardness roughness

Effect of solid-solution strengthening on deformation mechanisms and strain hardening in medium-entropy V_(1-x)Cr_(x)CoNi alloys

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Journal of Materials Science & Technology 2022年第13期108卷 270-280页

作者： Hyun Chung Dae woong Kim woo jin cho Heung Nam Han Yuji Ikeda Shoji Ishibashi Fritz Körmann Seok Su Sohn Department of Materials Science and Engineering Korea UniversitySeoul 02841South Korea Center for High Entropy Alloys Pohang University of Science and TechnologyPohang 37673South Korea Department of Materials Science and Engineering and Research Institute of Advanced Materials Seoul National UniversitySeoul 08826South Korea Institute for Materials Science University of StuttgartPfaffenwaldring 55Stuttgart 70569Germany Computational Materials Design Max-Planck-Institut für Eisenforschung GmbHMax-Planck-Strabe 1Düsseldorf 40237Germany Research Center for Computational Design of Advanced Functional Materials(CD-Fmat) National Institute of Advanced Industrial Science and Technology(AIST)TsukubaIbaraki 305-8568Japan Department of Materials Science and Engineering Delft University of TechnologyMekelweg2Delft 2628 CDthe Netherlands

High-and medium-entropy alloys(HEAs and MEAs)possess high solid-solution *** investigations have been conducted on its impact on yield strength,however,there are limited reports regarding the relation between solid-solution strengthening and strain-hardening *** addition,no attempt has been made to account for the dislocation-mediated plasticity;most works focused on twinning-or transformation-induced plasticity(TWIP or TRIP).In this work we reveal the role of solidsolution strengthening on the strain-hardening rate via systematically investigating evolutions of deformation structures by controlling the Cr/V ratio in prototypical V_(1-x)Cr_(x)CoNi *** the TWIP of CrCoNi with the dislocation slip of V_(0.4)Cr_(0.6)CoNi,the hardening rate of CrCoNi was superior to slip-band refinements of V_(0.4)Cr_(0.6)CoNi due to the dynamic Hall-Petch ***,as V content increased further to V_(0.7)Cr_(0.3)CoNi and VCoNi,their rate of slip-band refinement in V_(0.7)Cr_(0.3)CoNi and VCoNi with high solid-solution strength surpassed that of *** it is generally accepted in conventional alloys that deformation twinning results in a higher strain-hardening rate than dislocation-mediated plasticity,we observed that the latter can be predominant in the former under an activated huge solid-solution strengthening *** high solid-solution strength lowered the cross-slip activation and consequently retarded the dislocation rearrangement rate,i.e.,the dynamic *** delay in the hardening rate decrease,therefore,increased the strain-hardening rate,results in an overall higher strain-hardening rate of V-rich alloys.

关键词： Medium-entropy alloy Tensile property Solid-solution strength Strain-hardening rate Stacking fault energy

Development Strategy of Infrastructure Risk Assessment Based Disaster Response and Management System

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World Journal of Engineering and Technology 2014年第3期2卷 27-35页

作者： Eun-Ho Oh Kyoon-Tai Kim Kyong-Hoon Kim jin-Man Kim jin-woo cho Construction Management & Economy Research Division Korea Institute of Construction Technology Goyang-Si Gyonggi-Do South Korea Geotechnical Engineering Research Division Korea Institute of Construction Technology Goyang-Si Gyonggi-Do South Korea

Major infrastructures such as levee, dam, bridge, road, etc. have a significant meaning in that they are the means to support ordinary social and industrial activities and also protect human and physical assets at the occurrence of disaster. Especially, integrated risk management of SOC facilities provides the policy maker in charge of SOC facility safety and related disaster prevention with a reasonable means of decision making and ultimately contributes to improving the safety of the applicable SOC facility. Furthermore, a variety of issues raised in the Sewol ferry disaster that occurred recently in Korea, such as, a proper response method and the relevant Golden time decision making at the occurrence of disaster, rapid grasping and reporting the situation on disaster sites, management and mobilization of resources for rescue and recover, loss of integrated control tower function, etc., might occur as well in facility disaster management. As the method of solving such issues adequately, this study suggests a strategy of new disaster response and management system. The analyses of Hazus-MH (FEMA) and DIMSuS (Purdue University) were comprehensively conducted, and based on the results required functions of new disaster response system of major infrastructure and its development directions were suggested.

关键词： Infrastructure Risk Assessment Disaster Response Decision-Making

High mobility group box 1 in the central nervous system:regeneration hidden beneath inflammation

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Neural Regeneration Research 2025年第1期20卷 107-115页

作者： Hanki Kim Bum Jun Kim Seungyon Koh Hyo jin cho Xuelian jin Byung Gon Kim Jun Young choi Department of Brain Science Ajou University School of MedicineSuwonSouth Korea Department of Biomedical Sciences Ajou University Graduate School of MedicineSuwonSouth Korea Department of Neurology Ajou University School of MedicineSuwonSouth Korea Department of Geriatrics The Affiliated Suqian First People’s Hospital of Nanjing Medical UniversitySuqianJiangsu ProvinceChina

High-mobility group box 1 was first discovered in the calf thymus as a DNA-binding nuclear protein and has been widely studied in diverse fields,including neurology and ***-mobility group box 1 in the extracellular space functions as a pro-inflammatory damage-associated molecular pattern,which has been proven to play an important role in a wide variety of central nervous system disorders such as ischemic stroke,Alzheimer’s disease,frontotemporal dementia,Parkinson’s disease,multiple sclerosis,epilepsy,and traumatic brain *** drugs that inhibit high-mobility group box 1 as a damage-associated molecular pattern,such as glycyrrhizin,ethyl pyruvate,and neutralizing anti-high-mobility group box 1 antibodies,are commonly used to target high-mobility group box 1 activity in central nervous system *** it is commonly known for its detrimental inflammatory effect,high-mobility group box 1 has also been shown to have beneficial pro-regenerative roles in central nervous system *** this narrative review,we provide a brief summary of the history of high-mobility group box 1 research and its characterization as a damage-associated molecular pattern,its downstream receptors,and intracellular signaling pathways,how high-mobility group box 1 exerts the repair-favoring roles in general and in the central nervous system,and clues on how to differentiate the pro-regenerative from the pro-inflammatory *** targeting high-mobility group box 1 in the central nervous system may benefit from differentiating between the two functions rather than overall suppression of high-mobility group box 1.

关键词： central nervous system damage-associated molecular pattern ethyl pyruvate glycyrhizzin high mobility group box 1 inflammation neural stem cells neurodevelopment oligodendrocyte progenitor cells redox status regeneration

Super-resolution localization photoacoustic microscopy using intrinsic red blood cells as contrast absorbers

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Light(Science & Applications) 2019年第1期8卷 212-222页

作者： Jongbeom Kim jin Young Kim Seungwan Jeon jin woo BAIK Seong Hee cho Chulhong Kim Departments of Creative IT Engineering Electrical EngineeringMechanical Engineeringand Interdisciplinary Bioscience and BioengineeringPohang University of Science and Technology(POSTECH)77 Cheongam-roNam-guPohangGyeongbuk 37673Republic of Korea

Photoacoustic microscopy(PAM)has become a premier microscopy tool that can provide the anatomical,functional,and molecular information of animals and humans in ***,conventional PAM systems suffer from limited temporal and/or spatial ***,we present a fast PAM system and an agent-free localization method based on a stable and commercial galvanometer scanner with a custom-made scanning mirror(L-PAM-GS).This novel hardware implementation enhances the temporal resolution significantly while maintaining a high signal-to-noise ratio(SNR).These improvements allow us to photoacoustically and noninvasively observe the microvasculatures of small animals and humans in ***,the functional hemodynamics,namely,the blood flow rate in the microvasculature,is successfully monitored and quantified in *** importantly,thanks to the high SNR and fast B-mode rate(500 Hz),by localizing photoacoustic signals from captured red blood cells without any contrast agent,unresolved microvessels are clearly distinguished,and the spatial resolution is improved by a factor of 2.5 in ***-GS has great potential in various fields,such as neurology,oncology,and pathology.

关键词： resolution absorber scanner

Application of 3D bioprinting in the prevention and the therapy for human diseases

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Signal Transduction and Targeted Therapy 2021年第6期6卷 1681-1697页

作者： Hee-Gyeong Yi Hyeonji Kim Junyoung Kwon Yeong-jin choi jinah Jang Dong-woo cho Department of Rural and Biosystems Engineering College of Agriculture and Life SciencesChonnam National University77 Yongbong-RoGwangju 61186Korea Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-RoPohangKyungbuk 37673Korea Department of Advanced Biomaterials Research Korea Institute of Materials Science(KIMS)797 ChangwondaeroChangwonKyungnam 51508Korea Department of Convergence IT Engineering POSTECH77 Cheongam-RoPohangKyungbuk 37673Korea Institute of Convergence Science Yonsei University50 Yonsei-RoSeoul 03722Korea

Rapid development of vaccines and therapeutics is necessary to tackle the emergence of new pathogens and infectious *** speed up the drug discovery process,the conventional development pipeline can be retooled by introducing advanced in vitro models as alternatives to conventional infectious disease models and by employing advanced technology for the production of medicine and cell/drug delivery *** this regard,layer-by-layer construction with a 3D bioprinting system or other technologies provides a beneficial method for developing highly biomimetic and reliable in vitro models for infectious disease *** addition,the high flexibility and versatility of 3D bioprinting offer advantages in the effective production of vaccines,therapeutics,and relevant delivery ***,we discuss the potential of 3D bioprinting technologies for the control of infectious *** also suggest that 3D bioprinting in infectious disease research and drug development could be a significant platform technology for the rapid and automated production of tissue/organ models and medicines in the near future.

关键词： printing prevention introducing

Triolein emulsion infusion into the hepatic artery increases vascular permeability to doxorubicin in rabbit liver

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World Journal of Gastroenterology 2021年第2期27卷 152-161页

作者： Yong-woo Kim Hak jin Kim Byung Mann cho Seon Hee choi Department of Radiology Research Institute for Convergence of Biomedical Science and TechnologyPusan National University Yangsan HospitalPusan National University College of MedicineYangsan 50612South Korea Department of Radiology Biomedical Research InstitutePusan National University HospitalPusan National University College of MedicineBusan 49241South Korea Preventive Medicine and Occupational Medicine Pusan National University School of MedicineYangsan 50612South Korea Department of Radiology Pusan National UniversityBusan 49241South Korea

BACKGROUND The infusion of triolein emulsion(TE)induced increased vascular permeability and a negligible and temporary decrease in liver function without specific histopathological *** To assess changes in doxorubicin concentration according to the percentage of TE infused via a hepatic artery to study the vascular permeability in the rabbit *** Thirty-nine healthy rabbits were divided into five groups according to the concentration of emulsified triolein infused into the hepatic arteries:Group 0,saline infusion(control group,n=5);group 1,0.3%TE(n=13);group 2,0.6%TE(n=6);group 3,0.9%TE(n=8);and group 4,1.5%TE(n=6).Doxorubicin(2.4 mg/kg)was infused immediately after TE injection via the hepatic *** 2 h,the livers were harvested,and doxorubicin concentrations were calculated *** doxorubicin concentrations were compared between TE groups and the control group,and the optimal concentrations within the TE groups were *** analysis was performed using the nonparametric Mann-Whitney U test and Kruskal-Wallis test.P0.05).CONCLUSION TE infusion into the hepatic arteries significantly increased the doxorubicin concentration approximately twofold but was not different between the TE *** findings suggest that TE infusion might be a useful adjuvant treatment of liver cancers.

关键词： Triolein emulsion Liver tumor Chemotherapy Drug delivery Vascular permeability Dexorubicin

Robust digital receiver for EPC sensor network

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Journal of Systems Engineering and Electronics 2013年第1期24卷 44-51页

作者： Cheng jin Sung Ho cho Department of Electronics and Computer Engineering Hanyang University

A robust digital receiver based on a matched filter （MF） is proposed for the radio frequency identification （RFID） reader system to enhance the reliability of signal processing in the electronic product code （EPC） sensor network （ESN）. The performance of the proposed receiver is investigated by examining the anti-collision algorithm in the EPC global Class1 Generation2 protocol. The validity and usefulness are demonstrated by both computer simulations and experiments. Based on the verification results, comparing with the conventional zero crossing detector （ZCD） based receiver, the proposed receiver is very robust against strong amplitude distortions and considerable frequency deviations happening on the backscattered signal from a passive tag.

关键词： electronic product code (EPC) sensor network (ESN) signal distortion matched filter radio frequency identification (RFID) receiver.

Portable nano probe for micro/nano mechanical scratching and measuring

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Transactions of Nonferrous Metals Society of China 2011年第A01期21卷 205-209页

作者： woo-Park JEONG Chang-choi SOO cho HYUN woo-Lee DEUG Department of Mechanical Design Engineering Chosun University Department of Nano Fusion Technology Pusan National University Department of Nano-mechatronics Engineering Pusan National University

A nano probe system which can measure precise contact force in mN scale was demonstrated. The nano probe micro parts or optical parts in nanometer range resolution and scratch was originally designed for on-machine measuring applications and one kind of contact type measuring probes was designed for miniaturized or microfactory system. It ideally should be of small size and able to measure surface topography in nanometer scale. A commercial capacitive displacement sensor was proposed. It was a new concept in nano probe systems which can measure the displacement of shaft driven by the variation of surface topography. The nano probe mainly consisted of three parts： a capacitive displacement sensor, a porous type air slide and a contact probe part with various tip radiuses. The porous type air slide assured the shaft slided smoothly with controllable normal force in mN scale and had high positioning accuracy. The probe part which was directly in contact with target surface, can be applied to micro/nanoscale scratching as well as the measurement of sample topography by a simple tip change.

关键词： nano probe displacement sensor air slide PCD tip