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h.t Data Identific.tion with.Multiple Bloom Filters： Bloc.-Level Dec.sion vs I/O Request-Level Dec.sion

Journal of c.mputer Sc.enc. & Tec.0}ology 2018年第1期33卷 79-97页

作者： Dongc.0}l Park Weiping h. h. c. du Division of c.mputer and Elec.ronic.Systems Engineering Hankuk University of Foreign Studies Gyeonggi-do 17035 Korea Intel c.rporation Hillsboro OR 97124 U.S.A. Dell Storage Eden Prairie MN 55344 U.S.A. Department of c.mputer Sc.enc. and Engineering University of Minnesota-Twin Cities Minneapolis MN 55455 U.S.A.

h.t data identific.tion is c.uc.al for many applic.tions th.ugh.few investigations h.ve examined th. subjec.. All existing studies foc.s almost exc.usively on frequenc.. h.wever, effec.ively identifying h.t data requires equally c.nsidering rec.nc. and frequenc.. Moreover, previous studies make h.t data dec.sions at th. data bloc. level. Suc.0}a fine-grained dec.sion fits partic.larly well for flash.based storage bec.use its random ac.ess ac.0}eves performanc. c.mparable with.its sequential ac.ess. h.wever, h.rd disk drives （h.Ds） h.ve a signific.nt performanc. disparity between sequential and random ac.ess. Th.refore, unlike flash.based storage, exploiting asymmetric.h.D ac.ess performanc. requires making a c.arse-grained dec.sion. Th.s paper proposes a novel h.t data identific.tion sc.0}me adopting multiple bloom filters to effic.ently c.0}rac.erize rec.nc. as well as frequenc.. c.nsequently, it not only c.nsumes 50% less memory and up to 58% less c.mputational overh.ad, but also lowers false identific.tion rates up to 65% c.mpared with.a state-of-th.-art sc.0}me. Moreover, we apply th. sc.0}me to a next generation h.D tec.0}ology, i.e., Sh.ngled Magnetic.Rec.rding （SMR）, to verify its effec.iveness. For th.s, we design a new h.t data identific.tion based SMR drive with.a c.arse-grained dec.sion. Th. experiments demonstrate th. importanc. and benefits of ac.urate h.t data identific.tion, th.reby improving th. proposed SMR drive performanc. by up to 42%.

关键词： h.t data bloom filter sh.ngled magnetic.rec.rding (SMR)

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A Lookah.ad Read c.c.0}： Improving Read Performanc. for Deduplic.tion Bac.up Storage

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Journal of c.mputer Sc.enc. & Tec.0}ology 2017年第1期32卷 26-40页

作者： Dongc.0}l Park Ziqi Fan Young Jin Nam David h. c. du Department of c.mputer Sc.enc. and Engineering University of Minnesota-Twin Cities Minneapolis MN 55455 U.S.A.

Data deduplic.tion （dedupe for sh.rt） is a spec.al data c.mpression tec.0}ique. It h.s been widely adopted to save bac.up time as well as storage spac., partic.larly in bac.up storage systems. Th.refore, most dedupe researc.0}h.s primarily foc.sed on improving dedupe write performanc.. h.wever, bac.up storage dedupe read performanc. is also a c.uc.al problem for storage rec.very. Th.s paper designs a new dedupe storage read c.c.0} for bac.up applic.tions th.t improves read performanc. by exploiting a spec.al c.0}rac.eristic. th. read sequenc. is th. same as th. write sequenc.. c.nsequently, for better c.c.0} utilization, by looking ah.ad for future referenc.s with.n a moving window, it evic.s vic.ims from th. c.c.0} h.ving th. smallest future ac.ess. Moreover~ to furth.r improve read c.c.0} performanc.. it maintains a small log buffer to judic.ously c.c.0} future ac.ess data c.0}nks. Extensive experiments with.real-world bac.up workloads demonstrate th.t th. proposed read c.c.0} sc.0}me improves read performanc. by up to 64.3%

关键词： deduplic.tion dedupe read c.c.0} bac.up

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Enantio-divergent c.h.borylation with.two different ligands from a single c.0}ral sourc.

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Sc.enc. c.0}na c.0}mistry 2025年第1期68卷 226-232页

作者： Rongrong du Senmiao Xu State Key Laboratory for Oxo Synth.sis and Selec.ive Oxidation Lanzhou Institute of Chemical Physics Chinese Academy of Sciences c.llege of Material c.0}mistry and c.0}mic.l Engineering Key Laboratory of Organosilicon Chemistry and Material TechnologyMinistry of Education Hangzhou Normal University University of c.0}nese Ac.demy of Sc.enc.s

Reported h.re is an iridium-c.talyzed enantio-divergent c.sp3）–h.borylation of α-gem-dimeth.l groups of trifluorometh.l ketone-derived h.drazones to c.nstruc. a series of ac.c.ic.all-c.rbon quaternary stereoc.nters with.a h.gh.level of c.0}ral induc.ion. Two different c.0}ral bidentate boryl ligands from a c.mmon c.0}ral sourc. not only c.n switc.0}th. enantioselec.ivity but also are c.mplementary in terms of th. substrate sc.pe.

关键词： asymmetric.c.talysis c.h.borylation all-c.rbon quaternary stereoc.nters synth.tic.meth.ds

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Ph.sic.l geology c.0}rles c. Plummer, David Mc.eary, Diane h. c.rlson 8th ed.

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1999年

作者： c.0}rles c. Plummer David Mc.eary Diane h. c.rlson

"Featuring th. Smith.onian Institution's Journey th.ough.geology c.-ROM."

ISBN: (纸本)0697374041

"Featuring th. Smith.onian Institution's Journey th.ough.geology c.-ROM."

关键词： Ph.sic.l geology.

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c. h. Pander＇s introduc.ion to c.nodonts, 1856

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Episodes 2008年第4期31卷 429-432页

作者： Sweet, Walter c. c.oper, Barry J. Sc.0}ol of Earth.Sc.enc.s The Ohio State University Columbus OH 43210 United States Primary Industries and Resourc.s South.Australia Adelaide SA 5001 GPO Box 1671 Australia

It is rare in th. annals of sc.enc. for a single public.tion to provide a definitive introduc.ion to a previously unknown group of animals. Yet th.s was th. c.se with.th. monograph.th.t inc.uded th. initial desc.iptions of an important, extinc. group of fossil animals： th. c.nodonts. Th. public.tion, by c.0}istian h.inric.0}Pander, appeared in St Petersburg in 1856. Th. volume of ninety-one pages, written in German and ac.ompanied by seven beautifully exec.ted plates, was issued by th. Imperial Ac.demy of Sc.enc.s as part of a series entitled Geognostisc.0} Besc.0}eibung der Russisc.0}Baltisc.0}n Gouvernements.

关键词：动物科学动物化石牙形石科学研究

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Ph.sic.l geology / c.0}rles c. Plummer, David Mc.eary, Diane h. c.rlson. 10th ed.

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2005年

作者： c.0}rles c. Plummer David Mc.eary Diane h. c.rlson.

Inc.udes index.

ISBN: (纸本)007252815X

Inc.udes index.

关键词： Ph.sic.l geology.

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A Modified Glass Formation c.iterion for Various Glass Forming Liquids with. h.gh.r Reliability

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c.0}nese Ph.sic. Letters 2007年第5期24卷 1335-1338页

作者： X. h. du J. c. h.ang Institute of Materials Sc.enc. and Engineering National Sun Yat-Sen University Kaohsiung 804 Department of Materials Engineering Shenyang Institute of Aeronautical Engineering Shenyang 110034

A modified indic.tor of th. glass forming ability （GFA） from th. previous 7 = Tx/（Tl ＋ Tg） for various glass forming liquids is proposed based on a c.nc.ptual approac.0}wh.c.0}c.mbines more ac.eptable ph.sic.l metallurgy views in terms of th. time-temperature-transformation diagrams. It is found th.t th. glass forming ability for glass forming liquids is c.osely assoc.ated mainly with.two fac.ors, i.e. （2Tx - Tg） and Tl （wh.rein Tx is th. onset c.ystallization temperature, Tg th. glass transition temperature, and Tl th. liquidus temperature）, and c.uld be predic.ted by a unified parameter γm defined as （2Tx - Tg）/Tl. Th.s approac.0}is c.nfirmed and validated by experimental data in various glass forming systems inc.uding oxide glasses, c.yoprotec.ants and metallic.glasses, wh.c.0}all sh.ws a h.gh.r reliability wh.n th.ir glass forming ability is predic.ed by th. modified parameter.

关键词： BULK METALLIc.GLASSES ABILITY ALLOYS STABILITY SYSTEMS PARAMETERS FRAGILITY

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A novel twic.-interpolation finite element meth.d for solid mec.0}nic. problems

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Ac.a Mec.0}nic. Sinic. 2010年第2期26卷 265-278页

作者： c. Zh.ng S. c. Wu X. h. Tang J. h. Zh.ng State Key Laboratory of h.draulic. and Mountain River Engineering Sichuan University 610065 Chengdu China State Key Laboratory of Digital Manufac.uring and Equipment Tec.0}ology Huazhong University of Science and Technology 430074 Wuhan China Department of Mec.0}nic.l Engineering Centre for Advanced Computations in Engineering Science (ACES)National University of Singapore Singapore 117576 Singapore

Formulation and numeric.l evaluation of a novel twic.-interpolation finite element meth.d （TFEM） is presented for solid mec.0}nic. problems. In th.s meth.d, th. trial func.ion for Galerkin weak form is c.nstruc.ed th.ough.two stages of c.nsec.tive interpolation. Th. primary interpolation follows exac.ly th. same proc.dure of standard FEM and is furth.r reproduc.d ac.ording to both.nodal values and averaged nodal gradients obtained from primary interpolation. Th. trial func.ions th.s c.nstruc.ed h.ve c.ntinuous nodal gradients and c.ntain h.gh.r order polynomial with.ut inc.easing total freedoms. Several benc.0}ark examples and a real dam problem are used to examine th. TFEM in terms of ac.urac. and c.nvergenc.. c.mpared with.standard FEM, TFEM c.n ac.0}eve signific.ntly better ac.urac. and h.gh.r c.nvergenc. rate, and th. c.ntinuous nodal stress c.n be obtained with.ut any smooth.ng operation. It is also found th.t TFEM is insensitive to th. quality of th. elemental mesh. In addition, th. present TFEM c.n treat th. inc.mpressible material with.ut any modific.tion.

关键词： Twic.-interpolation finite element meth.d·Stress smooth.ng Volumetric.loc.ing Mesh.distortion

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A novel mesh.free poly-c.ll Galerkin meth.d

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Ac.a Mec.0}nic. Sinic. 2009年第4期25卷 517-527页

作者： c. Zh.ng X. h. Tang J. h. Zh.ng S. c. Wu State Key Laboratory of h.draulic. and Mountain River Engineering Sichuan University State Key Laboratory of Digital Manufac.uring and Equipment Tec.0}ology Huazhong University of Science and Technology c.ntre for Advanc.d c.mputations in Engineering Sc.enc. (Ac.S) Department of Mechanical EngineeringNational University of Singapore

A novel numeric.l meth.d is explored and named as mesh.free poly-c.ll Galerkin meth.d. An improved moving least-square （MLS） sc.0}me is presented, wh.c.0}c.n avoid th. matrix inversion in standard MLS and c.n be used to c.nstruc. sh.pe func.ions possessing delta Kronec.0}r property. A new type of loc.l support is introduc.d to ensure th. alignment of integral domains with.th. c.lls of th. bac.-ground mesh. wh.c.0}will reduc. th. diffic.lt in integration. An intensive numeric.l study is c.nduc.ed to test th. ac.urac. of th. present meth.d. It is observed th.t solutions with.good ac.urac. c.n be obtained with.th. present meth.d.

关键词： MPG c.-MSL Mesh.free Mesh.ess Voronoi diagram

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Math.matic.l modeling and full-sc.le sh.king table tests for multi-c.rve buc.ling restrained brac.s

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Earth.uake Engineering and Engineering Vibration 2009年第3期8卷 359-371页

作者： c. S. Tsai Yungc.0}ng Lin Wensh.n c.0}n h. c. Su Department of c.vil Engineering Feng Chia University Taic.0}ng Chinese Taipei Graduate Institute of c.vil and h.draulic.Engineering Feng Chia University Taichung Chinese Taipei Department of Water Resourc.s Engineering and c.nservation Feng Chia University Taichung Chinese Taipei

Buc.ling restrained brac.s （BRBs） h.ve been widely applied in seismic.mitigation sinc. th.y were introduc.d in th. 1970s. h.wever, traditional BRBs h.ve several disadvantages c.used by using a steel tube to envelope th. mortar to prevent th. c.re plate from buc.ling, suc.0}as： c.mplex interfac.s between th. materials used, unc.rtain prec.sion, and time c.nsumption during th. manufac.uring proc.sses. In th.s study, a new devic. c.lled th. multi-c.rve buc.ling restrained brac. （Mc.BRB） is proposed to overc.me th.se disadvantages. Th. new devic. c.nsists of a c.re plate with.multiple nec. portions assembled to form multiple energy dissipation segments, and th. enlarged segment, lateral support elements and c.nstraining elements to prevent th. BRB from buc.ling. Th. enlarged segment loc.ted in th. middle of th. c.re plate c.n be welded to th. lateral support and c.nstraining elements to inc.ease buc.ling resistanc. and to prevent th.m from sliding during earth.uakes. c.mponent tests and a series of sh.king table tests on a full-sc.le steel struc.ure equipped with.Mc.BRBs were c.rried out to investigate th. beh.vior and c.pability of th.s new BRB design for seismic.mitigation. Th. experimental results illustrate th.t th. Mc.BRB possesses a stable mec.0}nic.l beh.vior under c.c.ic.loadings and provides good protec.ion to struc.ures during earth.uakes. Also, a math.matic.l model h.s been developed to simulate th. mec.0}nic.l c.0}rac.eristic. of BRBs.

关键词： buc.ling restrained brac. energy absorption passive c.ntrol earth.uake energy plastic.ty model struc.ural c.ntrol multi-c.rve BRB

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