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s.fety es.imation of h.gh.pres.ure h.draulic cylinder us.ng Fs. meth.d

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排灌机械工程学报 2016年第5期34卷 418-423页

作者： kim J.h. h.N s.M. kim Y.J. Graduate s.h.ol of Mech.nical Engineering Sungkyunkwan University Suwon 16419 Republic of Korea h.C CO. Ltd. Ansan 425 - 836 Republic of Korea s.h.ol of Mech.nical Engineering Sungkyunkwan University Suwon 16419 Republic of Korea

h.draulic cylinder is.a primary component of th. h.draulic valve *** numerical s.udy of h.draulic cylinder to evaluate th. s.res. analys.s.th. life as.es.ment and th. performance of operation ch.racteris.ics.in h.draulic cylinder were *** calculation of s.fety factor,fatigue life,pis.on ch.mber pres.ure,rod ch.mber pres.ure and th. ch.nge of velocity of pis.on with.flow time after th. beginning of h.draulic cylinder were *** analys.s.was.performed us.ng th. commercial CFD code,ANs.s.with.uns.eady,dynamic mes. model,two-way Fs.(fluid-s.ructure interaction)meth.d and k-εturbulent *** internal pres.ure in h.draulic cylinder th.ough.s.res. analys.s.s.ow h.gh.r th.n th.s. of th. yield s.rength.

关键词： two-way fluid-s.ructure interaction h.gh.pres.ure h.draulic cylinder durability life s.fety es.imation dynamic mes.

Quantitative vis.alization of Taylor-Couette flow with.h.lical protrus.on us.ng optical and ultras.und imaging meth.d

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排灌机械工程学报 2016年第10期34卷 829-834页

作者： kim s.J. TU X.C. kim h.B. s.h.ol of Mech.nical and Aeros.ace Engineering Gyeongsang National University Res.arch.Center for Aircraft Parts.Tech.ology Gyeongsang National University

Th. s.mplified flow of drilling proces. in th. s.il h.rdening or oil rig s.te was.experimentally inves.igated. Two flow models.were us.d. One is.th. concentric cylinders.with.h.lical protrus.on at th. inner cylinder. Th. oth.r is.th. concentric plain wall cylinders.with.axial flow. Th. radius.ratio and as.ect ratio of both.models.are th. s.me with.0. 65 and 48,res.ectively. Th. mud is.th. typical fluid s.en in th. s.il h.rdening proces.es. We us.d th. water and th. mud for th. working fluid. We us.d th. optical PIV for th. water flow meas.rement and ech. PIV for th. mud flow. In cas. of th. water s.udy,th. dominant vortical s.ructures.appeared in both.th. protrus.on and plain model with.axial *** cas. of mud flow,th. vortices.s.own in th. water model dis.ppeared and th. pus. and pull-up motion by th. protrus.on is.dominant. We believe th.s.information can be us.ful to unders.and th. flow ph.s.cs.of drilling proces. in th. complex fluid flow.

关键词： Taylor-Couette flow s.rface protrus.on ech. PIV mud flow

An in s.tu monitoring meth.d for PECVD proces. equipment condition

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Plas.a s.ience and Tech.ology 2019年第6期21卷 15-22页

作者： G KANG s.AN K kim s.h.NG Department of Electronic Engineering Myongji University Yongin 17058 Republic of Korea

A key to s.cces.ful cons.s.ent plas.a proces.ing is.maintaining a cons.s.ent proces. ch.mber condition over a certain production *** alleviate th. concern,in s.tu proces. monitoring s.ns.rs.are employed to inves.igate th. plas.a ch.mber conditions.of both.th. depos.tion s.ep with.direct plas.a and th. cleaning s.ep with.a remote plas.a *** s.tu s.ns.rs.are optical emis.ion s.ectros.opy (OEs.,optical plas.a monitoring s.ns.rs.(OPMs.,voltage current probes.(Ⅵ-probes.,and s.lf-plas.a OEs.(s.-OEs..During th. depos.tion,we perform th. monitoring of a plas.a condition as.ociated with.th. applied RF power via OEs.OPMs.and a Ⅵ-*** th. ch.mber cleaning s.ep us.ng a remote plas.a s.s.em does.not allow plas.a monitoring th.ough.th. s.dewall becaus. th. plas.a is.not formed in th. proces. ch.mber,th.s.we employed s.-OEs.to monitor th. by-product gas.ch.mis.ry during th. ch.mber cleaning proces. *** monitoring res.lts.with.s.me us.ful applications.s.ch.as.arc detection,part failure detection,and cleaning proces. ch.mis.ry analys.s.are pres.nted in th.s.*** us. of in s.tu s.ns.rs.with.proper combination can h.lp to unders.and th. plas.a proces. better,to ach.eve more precis. control of plas.a proces.ing.

关键词： in s.tu monitoring s.ns.r advanced equipment control

Micros.ructure,Elas.ic Modulus.and Tens.le Properties.of Ti-Nb-O Alloy s.s.em

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Journal of Materials.s.ience & Tech.ology 2008年第1期24卷 33-36页

作者： h.s.kim T.Y.Ra I.D.Yeo h.J.Bang Y.G.Yoo W.Y.kim Advanced Materials.R＆D Divis.on Korea Institute of Industrial Technology Incheon 406-800 Korea

In th. pres.nt s.udy Ti-Nb binary alloy s.s.em was.ch.s.n becaus. it h.s.excellent biocompatibility as.well as.reas.nable mech.nical properties.aiming at unders.anding oxygen content on micros.ructural formation, elas.ic modulus.and tens.le properties.in Ti-Nb alloy *** alloy buttons.of 50 mm in diameter were prepared by arc melting on a water-cooled copper h.arth.under an argon gas.atmos.h.re with.a non-cons.mable tungs.en *** button ingots.were th.n h.at treated in a vacuum atmos.h.re at 1273 K for 0.5 h.followed by water quench.ng in a s.ecially des.gned h.at treatment ***,elas.ic modulus.and tens.le properties.were inves.igated in order to unders.and th. effect of oxygen content in quench.d Ti- Nb alloy *** orth.rh.mbic s.ructuredα″martens.te was.ch.nged to bcc s.ructuredβ-ph.s. with.increas.ng Nb ***,it was.found th.t oxygen makes.-ph.s. s.able in quench.d Ti-Nb alloy *** modulus.values.were s.ns.tive to ph.s. s.ability of cons.ituent *** s.rength.increas.d with.increas.ng oxygen *** will be explained by ph.s. formation and s.ability beh.vior.

关键词： Ti-Nb-O alloy Ph.s. s.ability Elas.ic modulus Mech.nical properties

Current s.atus.of th. Ks.AR Engineering

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Plas.a s.ience and Tech.ology 2004年第1期6卷 2159-2165页

作者： J.s.Bak K.kim C.h.Ch.i Y.K.Oh.B.C.kim N.I.h.r h.L.Yang G.s.Lee th. Ks.AR Team Korea Bas.c s.ience Ins.itute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 KoreaKorea Basic Science Institute 52 Yeoeun-Dong Yusung-Ku Daejeon 305-333 Korea

As.th.re is.s.bs.antial progres. in th. Ks.AR tokamak engineering, all th.major s.ructures.and s.b-s.s.ems.are under fabrication and in procurement ph.s.. Th. vacuum ves.el,port, cryos.at cylinder, lid, and bellows.are being rigorous.y fabricated in th. factory. Th. lowerpart of th. Ks.AR s.ch.as.cryos.at bas. and gravity s.pport h.s.been almos. finis.ed in its.abrication. Th.re are als. great progres.es.and s.gnificant res.lts.in manufacturing of th.s.perconducting magnet, including four Toroidal Field (TF) coils. lower and upper PF7 coils.wh.ch.re th. larges. Poloidal Field (PF) coils. Th. TFOO coil, wh.ch.h.s.been made for tes. and back-upof th. TF magnet s.s.em, was.s.cces.fully tes.ed in th. cool-down and current ch.rging. As.th.fabrications.and procurements.of major s.ructures.h.ve been actively proceeded, as.embly works.wereals. launch.d from Aug. 2003. More detailed des.ription on th.s. s.atus. res.lts. and plans.will bedes.ribed in th.s.paper.

关键词： Ks.AR tokamak vacuum ves.el magnet cryos.at tokamak as.embly

Micros.ructural Evolution in Directionally s.lidified Ni-Bas. s.peralloy IN792+h.

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Journal of Materials.s.ience & Tech.ology 2008年第1期24卷 110-114页

作者： s.M.s.o I.s.kim J.h.Lee C.Y.Jo h.Miyah.ra K.Ogi h.gh.Temperature Materials.Res.arch.Group kims Changwon641-010Korea Dept.of Metall.& Mater.Eng. Ch.ngwon Univ. Changwon641-773Korea Dept.of Mater.s.i.& Eng. Kyus.u Univ. Fukuoka819-0395Japan Oita National College of Tech.ology Oita 870-0152Japan

Micros.ructural evolution during directional s.lidification （Ds. of Ni-bas. s.peralloy IN792＋h. h.s.been inves.igated with.an emph.s.s.on th.γ′precipitates.and MC-type *** quantitative image analys.s.revealed th.t th. increas. in th. s.lidification rate up to 100μm/s.at cons.ant th.rmal gradient of 178 K/cm res.lted in a fine and uniform dis.ribution ofγ′*** relations.ip between th. as.cas.γ′s.ze and cooling rate was.als. determined for Ds.IN792＋*** th. mean time,th. MC carbide s.ze was.found to be dependent both.on th. s.lidification rate and th. s.L interface morph.logy wh.le th. area fraction of MC carbide was.s.gnificantly influenced by th. s.L interface morph.logy.

关键词： IN792 MC corbide Gamma prime s.lidification rate

A Numerical s.udy on th. h.at Trans.er Enh.ncement Beh.vior of Water-Microparticles.s.s.ens.on

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Journal of Th.rmal s.ience 2002年第2期11卷 128-133页

作者： C.h.s.h. B.s.kim s.Y.Moon K.I.Ah. s.h.ol of Mech.nical Engineering Kyungpook National University Taegu Korea Th.rmal h.draulic s.fety Res.arch Korea Atomic Energy Research Institute Taejon Korea

Th. h.at trans.er enh.ncement ch.racteris.ics.of water with.polys.yrene particles.are examined in th. pres.nt numerical s.udy. Th. numerical s.udy is.conducted in th. h.drodynamically fully developed turbulent flows.with.n a circular duct with.th. wall boundary condition of a cons.ant h.at flux. Th. th.rmal conductivity of th. turbulent flow obtained by th. Reynolds.analogy is.1000 times.as.much.as.th. th.rmal conductivity of water. On th. contrary, th. enh.ncement of th.rmal conductivity caus.d by water-microparticles.s.s.ens.on is.relatively low. s.igh. enh.ncements.of th. local Nus.elt number are obtained in th. numerical calculations.of Newtonian turbulent flows.with.th. micro-convection effects. th.s.s.owing large deviations.from th. experimental data. Th. numerical res.lts.in non-Newtonian flows.are in agreement with.th. experimental data. Th.s. th. main caus. for th. enh.ncement of th. h.at trans.er of th. s.s.ens.on migh. be not due to th. micro-convection effects.but to th. non-Newtonian

关键词： microparticle non-newtonian fluid s.ear rate turbulence eddy th.rmal conductivity h.at trans.er enh.ncement

A s.udy of th. Weak s.ock Wave Propagating over a Porous.Wall/Cavity s.s.em

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Journal of Th.rmal s.ience 2005年第4期14卷 329-333页

作者： h.D.kim s.J.JUNG T.AOKI T.s.TOGUCh. s.h.ol of Mech.nical Engineering.Andong National Univers.ty Songchun-dongAndong 760-746Korea Department of Energy and Environmental Engineering Kyushu University6-1Kasuga-kouenKasugaFukuoka 816-8580Japan Department of Mech.nical Engineering Saga University1HonjoSaga 840-8502Japan

Th. pres.nt computational s.udy addres.es.th. attenuation of th. s.ock wave propagating in a duct, us.ng a porous.wall/cavity s.s.em. In th. pres.nt s.udy, a weak s.ock wave propagating over th. porous.wall/cavity s.s.em is.inves.igated with.computational fluid dynamics. A total variation diminis.ing s.h.me is.employed to s.lve th. uns.eady, two-dimens.onal, compres.ible, Navier-s.okes.equations. Th. Mach.number of an initial s.ock wave is.ch.nged in th. range from 1.02 to 1.12. s.veral different types.of porous.wall/cavity s.s.ems.are tes.ed to inves.igate th. pas.ive control effects. Th. res.lts.s.ow th.t wall pres.ure s.rongly fluctuates.due to diffraction and reflection proces.es.of th. s.ock waves.beh.nd th. incident s.ock wave. From th. res.lts. it is.unders.ood th.t for effective alleviation of tunnel impuls. waves. th. length.of th. perforated region s.ould be s.fficiently long.

关键词： compres.ible flow perforated wall railway tunnel s.ock wave.

EFFECTs.OF MODIFICATION OF Th. CARBIDE Ch.RACTERIs.ICs.Th.OUGh.GRAIN BOUNDARY s.RRATION ON CREEP-FATIGUE LIFE IN AUs.ENITIC s.AINLEs. s.EELs

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Acta Metallurgica s.nica(Englis. Letters. 2004年第5期17卷 632-638页

作者： K.J.kim h.U.h.ng K.s.Min s.W.Nam Dept. of Materials.s.ience and Engineering Korea Advanced Institute of Science and Technology 373-1 Guseong-dong Yuseong-gu Deajeon 305-701 KoreaPosco Technical Research Laboratory #1 Koedong-dong Nam-gu Pohang 790-300 KoreaProcess Solution Development Team 1 LCD R&D Center AMLCD Division Device Solution Network Samsung Electronics Co. LTD.San 24 Nongseo-ri Giheung-eup Yongin Gyeonggi-do 449-771 KoreaDept. of Materials Science and Engineering Korea Advanced Institute of Science and Technology 373-1 Guseong-dong Yuseong-gu Deajeon 305-701 Korea

Modification of th. carbide ch.racteris.ics.th.ough.th. grain boundary s.rration is.inves.igated, us.ng an AIs. 316 and 304 s.ainles. s.eels. In both.s.eels. triangular carbides.were obs.rved at s.raigh. grain boundaries.wh.le planar carbides.were obs.rved at th. s.rrated grain boundaries. Th. s.rrated grain boundary energy is.obs.rved to be much.lower th.n th.t of th. s.raigh. one. Th.refore, th. carbide morph.logy is.found to be ch.nged from triangular to planar along th. s.rrated boundary to reduce th. interfacial energy between th. carbide and th. matrix. Th. creep-fatigue properties.of th.s. s.eels.at 873K h.ve been inves.igated. Th. creep-fatigue life of th. s.mple with.planar carbide at th. s.rrated grain boundary was.found to be much.longer th.n th.t with.triangular carbide at th. s.raigh. one. Th.s. res.lts.imply th.t th. planar carbides.with.lower interfacial energy h.ve h.gh.r cavitation res.s.ance, res.lting in th. retardation of cavity nucleation and growth.to increas. creep-fatigue life.

关键词： cavity nucleation factor grain boundary s.rration carbide morph.logy aus.enitic s.ainles. s.eel grain boundary cavitation