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Experimental Study of Material Removal Process of Fused Silica Glass Using MR Jet Polishing System

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Journal of Iron and Steel Research(International) 2012年第S1期19卷 604-607页

作者： LEE Jung-Won cho Yong-Kyu CAI Yue choI Seung-Bok cho myeong-woo Department of Mechanical Engineering Inha UniversityIncheon 402-751Korea

Recently,there has been an investigation of polishing processes that has considered new ultra-precision polishing technology for micro parts and optical parts such as those with aspheric and complex *** suitable means of polishing complex shapes is to use a jet of abrasive ***,aerodynamic disturbances and radial spreading are generated by the unstable polishing process of the jet on the surface of the workpiece when it is being polished.A method of jet stabilization has been proposed in which the original nozzle form of a jet of magnetorheological(MR)fluid contains abrasive particles that are magnetized using a *** paper details the design of an MR jet polishing system that uses an electromagnet,a nozzle,and a hydraulic unit to stabilize a slurry jet based on MR fluid, Second,for silica glass,the polishing spot and section profile are analyzed and the effect of the MR fluid jet polishing process is *** results of the experiment show that the removal profile is W-shaped and that,in this case,a stable can be proof of a distance of several tens of millimeters from the *** results show the possibility of applying the proposed polishing method using MR fluids in ultra-precision micro and optical parts production processes. MR jet polishing shows great potential for use as a new type of precision surface polishing *** particular,this is a highly valuable process for the polishing of complex shapes such as micro parts,concaves parts,and cavities.

关键词： magnetorheological(MR)fluids optical part fused silica glass material removal rate MR jet polishing system

An Evaluation of the Machinability of Nitinol SMA Using Combined Process of EP and MR Polishing

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Journal of Iron and Steel Research(International) 2012年第S2期19卷 629-632页

作者： HA Seok-Jae SHIN Bong-Cheol cho myeong-woo LEE Eun-Sang choI Seung-Bok Department of Mechanical Engineering Inha University Samsung Electro-Mechanics

Nitinol,a shape memory alloy(SMA),is manufactured from titanium and *** is employed in various fields for use in devices such as micro sensors,ultra-precision devices and satellite *** is highly recommended as a material in medical stents for insertion into the body because it has excellent organic ***,because they are intended to be inserted into the human body,products such as medical stents require a high-quality *** nitinol has more of the characteristics of titanium than of nickel,one of its drawbacks is that heat generated in nitinol during machining is not discharged smoothly,leading to areas of inner stress which occur when traditional machining methods are *** overcome this difficulty,various non-traditional machining methods,including non-contact machining,have been investigated for use with *** study is focused on the application of an effective fabrication method that combines electrolytic polishing(EP)and MR polishing to improve the surface integrity of nitinol through a series of *** roughness variations of the polished nitinol were investigated by changing the imposed polishing conditions of EP and MR polishing,***,the variations in the surface roughness were observed with polished previously performed via the EP process.

关键词： electrolytic polishing(EP) magnetorheological(MR)fluids Ni-Ti alloy shape memory alloy(SMA) surface roughness

Rheological Properties and MR Polishing Characteristics of Core Shell-Structured Silica-Coated CI Particles

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Journal of Iron and Steel Research(International) 2012年第S2期19卷 625-628页

作者： HONG Kwang-Pyo LEE Jung-Won choI Seung-Bok KIM Gun-Hee choI Hyoung-Jin cho myeong-woo Department of Mechanical Engineering Inha University Korea Institute of Industrial Technology Department of Polymer Science and Engineering Inha University

Recently,ultra-precision polishing processes using smart materials such as magnetorheological(MR)fluids have been used for optics parts such as aspheric *** MR fluid applied in MR polishing is a phase controllable suspension comprising a mixture of CI particles and non-magnetic fluids such as mineral oil and *** fluids are a kind of smart material that can be controlled according to their flow properties such as viscosity and stiffness. Water-based MR fluids are easily oxidized if the fluids are exposed and this oxidation can bring irregular polishing results. Also,this phenomenon is one of several factors that reduce the life time of MR *** a previous work,CI particles were coated with a polymer or a composite for the improvement of dispersion stability and prevention of corrosion due to *** this study,the rheological properties such as viscosity and sedimentation of coated CI particles with silica were investigated with a rotational rheometer;MR polishing characteristics of BK7 glass were studied in order to investigate the surface *** wheel speed and magnetic field intensity were chosen as variables.

关键词： magnetorheological polishing silica viscosity surface roughness material removal

Depolarization mitigated in ferroelectric Hf_(0.5)Zr_(0.5)O_(2)ultrathin films(<5 nm)on Si substrate by interface engineering

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Journal of Advanced Ceramics 2024年第3期13卷 282-292页

作者： Se Hyun Kim Younghwan Lee Dong Hyun Lee Geun Hyeong Park Hyun woo Jeong Kun Yang Yong Hyeon cho Young Yong Kim Min Hyuk Park Department of Materials Science and Engineering College of EngineeringSeoul National UniversitySeoul 08826Republic of Korea Research Institute of Advanced Materials College of EngineeringSeoul National UniversitySeoul 08826Republic of Korea Inter-university Semiconductor Research Center College of EngineeringSeoul National UniversitySeoul 08826Republic of Korea Pohang Accelerator Laboratory Pohang University of Science&TechnologyPohang 790784Republic of Korea

(Hf,Zr)O_(2)offers considerable potential for next-generation semiconductor devices owing to its nonvolatile spontaneous polarization at the ***,scaling this material to sub-5 nm thickness poses several challenges,including the formation of an interfacial layer and high trap *** particular,a low-k SiO_(2)interfacial layer is naturally formed when(Hf,Zr)O_(2)films are directly grown on a Si substrate,leading to high depolarization fields and rapid reduction of the remanent *** address these issues,we conducted a study to significantly improve ferroelectricity and switching endurance of(Hf,Zr)O_(2)films with sub-5 nm thicknesses by inserting a TiO_(2)interfacial *** deposition of a Ti film prior to Hf_(0.5)Zr_(0.5)O_(2)film deposition resulted in a high-k TiO_(2)interfacial layer and prevented the direct contact of Hf_(0.5)Zr_(0.5)O_(2)with *** findings show that the high-k TiO_(2)interfacial layer can reduce the SiO_(2)/Si interface trap density and the depolarization field,resulting in a switchable polarization of 60.2μC/cm^(2)for a 5 nm thick Hf_(0.5)Zr_(0.5)O_(2)***,we propose that inserting a high-k TiO_(2)interfacial layer between the Hf_(0.5)Zr_(0.5)O_(2)film and the Si substrate may offer a promising solution to enhancing the ferroelectricity and reliability of(Hf,Zr)O_(2)grown on the Si substrate and can pave the way for next-generation semiconductor devices with improved performance.

关键词： ferroelectric charge trapping hafnia depolarization

A Web-based machining process monitoring system for E-manufacturing implementation

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第9期7卷 1467-1473页

作者： SHIN Bong-cheol KIM Gun-hee choI Jin-hwa JEON Byung-cheol LEE Honghee cho myeong-woo HAN Jin-yong PARK Dong-sam Division of Mechanical Engineering Inha University Incheon 402-751 Korea Department of Mechanical Engineering University of Incheon Incheon 402-749 Korea

Recently, with the rapid growth of information technology, many studies have been performed to implement Web-based manufacturing system. Such technologies are expected to meet the need of many manufacturing industries who want to adopt E-manufacturing system for the construction of globalization, agility, and digitalization to cope with the rapid changing market requirements. In this research, a real-time Web-based machine tool and machining process monitoring system is developed as the first step for implementing E-manufacturing system. In this system, the current variations of the main spindle and feeding motors are measured using hall sensors. And the relationship between the cutting force and the spindle motor RMS (Root Mean Square) current at various spindle rotational speeds is obtained. Thermocouples are used to measure temperature variations of important heat sources of a machine tool. Also, a rule-based expert system is applied in order to decide the machining process and machine tool are in normal conditions. Finally, the effectiveness of the developed system is verified through a series of experiments.

关键词：网络制造 Web系统 Internet 专家系统自动化

Surface-modified Ag@Ru-P25 for photocatalytic CO_(2) conversion with high selectivity over CH_(4) formation at the solid–gas interface

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Carbon Energy 2024年第1期6卷 182-196页

作者： Chaitanya B.Hiragond Sohag Biswas Niket SPowar Junho Lee Eunhee Gong Hwapyong Kim Hong Soo Kim Jin-woo Jung Chang-Hee cho Bryan M.Wong Su-Il In Department of Energy Science&Engineering Daegu Gyeongbuk Institute of Science and Technology(DGIST)DaeguRepublic of Korea Department of Chemical&Environmental Engineering Materials Science&Engineering ProgramDepartment of ChemistryDepartment of Physics&AstronomyUniversity of California-RiversideRiversideCaliforniaUSA Department of Physics and Chemistry Daegu Gyeongbuk Institute of Science and Technology(DGIST)DaeguRepublic of Korea NiceScience Corporation DaeguRepublic of Korea

Systematic optimization of the photocatalyst and investigation of the role of each component is important to maximizing catalytic activity and comprehending the photocatalytic conversion of CO_(2) reduction to solar fuels.A surface-modified Ag@Ru-P25 photocatalyst with H_(2)O_(2) treatment was designed in this study to convert CO_(2) and H_(2)O vapor into highly selective *** doping followed by Ag nanoparticles(NPs)cocatalyst deposition on P25(TiO_(2))enhances visible light absorption and charge separation,whereas H_(2)O_(2) treatment modifies the surface of the photocatalyst with hydroxyl(–OH)groups and promotes CO_(2) ***-resonance transmission electron microscopy,X-ray photoelectron spectroscopy,X-ray absorption near-edge structure,and extended X-ray absorption fine structure techniques were used to analyze the surface and chemical composition of the photocatalyst,while thermogravimetric analysis,CO_(2) adsorption isotherm,and temperature programmed desorption study were performed to examine the significance of H_(2)O_(2) treatment in increasing CO_(2) reduction *** optimized Ag1.0@Ru1.0-P25 photocatalyst performed excellent CO_(2) reduction activity into CO,CH4,and C2H6 with a~95%selectivity of CH4,where the activity was~135 times higher than that of pristine TiO_(2)(P25).For the first time,this work explored the effect of H_(2)O_(2) treatment on the photocatalyst that dramatically increases CO_(2) reduction activity.

关键词： gas-phase CO_(2) reduction H_(2)O_(2) treatment plasmonic nanoparticles solar fuel photocatalyst surface modification

A Web-based on-machine mould matching and measurement system based on CAD/CAM/CAI integration

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第9期7卷 1474-1481页

作者： choI Jin-hwa JEON Byung-cheol KIM Gun-hee SHIN Bong-cheol LEE Honghee cho myeong-woo SEONG Eun-je PARK Dong-sam Division of Mechanical Engineering Inha University Incheon 402-751 Korea Department of Mechanical Engineering University of Incheon Incheon 402-749 Korea

The purpose of this study is to develop a Web-based on-machine mould identification and measurement system. The Web-based mould identification system matches obtained vision information with CAD database. Developed Web-based system is to exchange messages between a server and a client by making of ActiveX control, and the result of mould identification is shown on Web-browser at remote site. For effective feature classification and extraction, the signature method is used to make meaningful information from obtained image data. For on-machine measurement of the matched mould, inspection database is constructed from CAD database using developed inspection planning methods. The results are simulated and analyzed using developed system to verify the effectiveness of the proposed methods.

关键词： CAD CAM CAI 网络制造视觉系统

Experimental Study of Material Removal Process of Fused Silica Glass Using MR Jet Polishing System

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Experimental Study of Material Removal Process of Fused Sili...

Dieckol isolated from Eisenia bicyclis extract suppresses RANKL-induced osteoclastogenesis in murine RAW 264.7 cells

第七届冶金与材料电磁过程国际会议（EPM2012）

作者： LEE Jung-Won cho Yong-Kyu CAI Yue choI Seung-Bok cho myeong-woo Department of Mechanical Engineering Inha University

Recently,there has been an investigation of polishing processes that has considered new ultra-precision polishing technology for micro parts and optical parts such as those with aspheric and complex *** suitable means of polishing complex shapes is to use a jet of abrasive ***,aerodynamic disturbances and radial spreading are generated by the unstable polishing process of the jet on the surface of the workpiece when it is being polished.A method of jet stabilization has been proposed in which the original nozzle form of a jet of magnetorheological（MR） fluid contains abrasive particles that are magnetized using a *** paper details the design of an MR jet polishing system that uses an electromagnet,a nozzle,and a hydraulic unit to stabilize a slurry jet based on MR ***,for silica glass,the polishing spot and section profile are analyzed and the effect of the MR fluid jet polishing process is *** results of the experiment show that the removal profile is W-shaped and that,in this case,a stable can be proof of a distance of several tens of millimeters from the *** results show the possibility of applying the proposed polishing method using MR fluids in ultra-precision micro and optical parts production *** jet polishing shows great potential for use as a new type of precision surface polishing *** particular,this is a highly valuable process for the polishing of complex shapes such as micro parts,concaves parts,and cavities.

关键词： magnetorheological(MR) fluids optical part fused silica glass material removal rate MR jet polishing system

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Asian Pacific Journal of Tropical Biomedicine 2022年第6期12卷 262-269页

作者： Su-Hyeon cho Tae-Hyung Kwon Hoibin Jeong Jin Sook Kim Song-Rae Kim myeong Seon Jeong SeonJu Park Miri choi Jung-Hee woo Juhee Ahn Kil-Nam Kim Chuncheon Center Korea Basic Science InstituteChuncheon 24341Republic of Korea Department of Medical Biomaterials Engineering College of Biomedical SciencesKangwon National UniversityChuncheon 24341Republic of Korea Department of Research and Development Chuncheon Bio-industry FoundationChuncheonRepublic of Korea Marine Industry Research Institute for East se rim Uljin-gunGyeongsangbuk-doRepublic of Korea Department of Bio-analysis Science University of Science&TechnologyDaejeon34113Republic of Korea

Objective:To demonstrate the effect of dieckol from Eisenia bicyclis on osteoclastogenesis using RAW 264.7 ***:Murine macrophage RAW 264.7 cells were subjected to dieckol treatment,followed by treatment with receptor activator of nuclear factor kappa-B ligand(RANKL)to induce ***-resistant acid phosphatase(TRAP)activity was examined using a TRAP activity *** blotting analysis was conducted to examine the level of osteoclast-related factors,including TRAP and calcitonin receptor(CTR),transcriptional factors,including c-Fos,c-Jun,and nuclear factor of activated T cells cytoplasmic 1(NFATc1),nuclear factor kappa-B(NF-κB),extracellular signal-regulated kinase(ERK),and c-Jun N-terminal kinase(JNK).Immunofluorescence staining was conducted to examine the expression of c-Fos,c-Jun,and ***:Among the four phlorotannin compounds present in Eisenia bicyclis,dieckol significantly hindered osteoclast differentiation and expression of RANKL-induced TRAP and *** addition,dieckol downregulated the expression levels of c-Fos,c-Jun,NFATc1,ERK,and JNK,and suppressed NF-κB ***:Dieckol can suppress RANKL-induced ***,it has therapeutic potential in treating osteoclastogenesis-associated diseases.

关键词： Eisenia bicyclis Dieckol Osteoclasts ERK JNK NF-κB RANKL TRAP Calcitonin receptor NFATc1 RAW 264.7 cell