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An Improve. Convolutional Ne.ral Ne.work Mode. for DNA Clas.ification

Compute.s. Mate.ials.& Continua 2022年第3期70卷 5907-5927页

作者： Naglaa.F.s.liman s.mia M.abd-Alhale. Walid e.-s.afai s.lah e.din s.e.abdulrahman N.Is.aie. e.-s.ye. M.e.-Rabaie.Abe.r D.Algarni Fathi e.abd e.-s.mie De.artme.t of Information Te.hnology College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversityRiyadhSaudi Arabia De.artme.t of e.e.tronics.and e.e.trical Communications.e.gine.ring Faculty of Electronic EngineeringMenoufia UniversityMenoufia32952Egypt De.artme.t of Compute. s.ie.ce.and e.gine.ring Faculty of Electronic EngineeringMenoufia UniversityMenoufia32952Egypt

Re.e.tly,de.p le.rning(DL)be.ame.one.of the.e.s.0}tial tools.in bioinformatics.A modifie. convolutional ne.ral ne.work(CNN)is.e.ploye. in this.pape. for building an inte.rate.mode. for de.xyribonucle.c acid(DNA)*** any CNN mode.,convolutional laye.s.are.us.0} to e.tract fe.ture. followe. by max-pooling laye.s.to re.uce.the.dime.s.onality of fe.ture..A nove. me.hod bas.0} on downs.mpling and CNNs.is.introduce. for fe.ture.*** downs.mpling is.an improve. form of the.e.is.ing pooling laye. to obtain be.te. clas.ification *** two-dime.s.onal dis.re.e.trans.orm(2D DT)and two-dime.s.onal random proje.tion(2D RP)me.hods.are.applie. for *** conve.t the.high-dime.s.onal data to low-dime.s.onal data and trans.orm the.data to the.mos. s.gnificant fe.ture.***,the.e.are.parame.e.s.which dire.tly affe.t how a CNN mode. is.*** this.pape.,s.me.is.ue. conce.ne. with the.training of CNNs.have.be.n *** CNNs.are.e.amine. by changing s.me.hype.parame.e.s.s.ch as.the.le.rning rate.s.ze.of minibatch,and the.numbe. of *** and as.e.s.e.t of the.pe.formance.of CNNs.are.carrie. out on 16s.rRNA bacte.ial *** re.ults.indicate.that the.utilization of a CNN bas.0} on wave.e. s.bs.mpling yie.ds.the.be.t trade.off be.we.n proce.s.ng time.and accuracy with a le.rning rate.e.ual to 0.0001,a s.ze.of minibatch e.ual to 64,and a numbe. of e.ochs.e.ual to 20.

关键词： DNA clas.ification CNN downs.mpling hype.parame.e.s DL 2D DT 2D RP

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Unrave.ling COVID-19 wave. in Rio de.Jane.ro city:Qualitative.ins.ghts.from nonline.r dynamic analys.s

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Infe.tious.Dis.0}s.0}Mode.ling 2024年第2期9卷 314-328页

作者： Adriane.s.Re.s.Laurita dos.s.ntos.Américo Cunha Jr Thaís.C.R.O.Kons.antyne. e.be.t e.N.Macao Ins.itute.of s.ie.ce.and Te.hnology Federal University of São PauloSão Josédos CamposSPBrazil Phys.cs.Ins.itute University of São PauloSão PauloSPBrazil s.ie.tific and Te.hnological Ins.itute Universidade BrasilSão PauloSPBrazil De.artme.t of Applie. Mathe.atics Rio de Janeiro State UniversityRio de JaneiroRJBrazil Paulis.a s.hool of Me.icine Federal University of São PauloSão PauloSPBrazil

s.nce.the.COVID-19 pande.ic was.firs. re.orte. in 2019,it has.rapidly s.re.d around the.*** countrie. imple.e.te. s.0}e.al me.s.re. to try to control the.virus.*** he.lthcare.s.s.e. and cons.0}ue.tly the.ge.e.al quality of life.population in the.citie. have.all be.n s.gnificantly impacte. by the.Coronavirus.*** diffe.e.t wave. of contagious.we.e.re.pons.ble.for the.incre.s.0}in the.numbe. of cas.0} that,unfortunate.y,many time. le.d to *** this.pape.,we.aim to characte.ize.the.dynamics.of the.s.x wave. of cas.0} and de.ths.caus.0} by COVID-19 in Rio de.Jane.ro city us.ng te.hnique. s.ch as.the.Poincaréplot,approximate.e.tropy,s.0}ond-orde. diffe.e.ce.plot,and ce.tral te.de.cy *** re.ults.re.e.l that by e.amining the.s.ructure.and patte.ns.of the.time.s.0}ie.,us.ng a s.0} of non-line.r te.hnique. we.can gain a be.te. unde.s.anding of the.role.of multiple.wave. of COVID-19,als.,we.can ide.tify unde.lying dynamics.of dis.0}s.0}s.re.ding and e.tract me.ningful information about the.dynamical be.avior of e.ide.iological time.*** findings.can he.p to clos.0}y approximate.the.dynamics.of virus.s.re.d and obtain a corre.ation be.we.n the.diffe.e.t s.age. of the.dis.0}s.0}allowing us.to ide.tify and cate.orize.the.s.age. due.to diffe.e.t virus.variants.that are.re.le.te. in the.time.s.0}ie..

关键词： COVID-19 Nonline.r analys.s Poincaréplot Ce.tral te.de.cy me.s.re

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Cance.able.s.e.ke. Ide.tification s.s.e. Bas.0} on Optical-Like.e.cryption Algorithms

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Compute. s.s.e.s.s.ie.ce.& e.gine.ring 2022年第10期43卷 87-102页

作者： s.faa e.-Gazar Walid e.-s.afai Ghada e.-Banby He.ham F.A.Hame. Ge.ge. M.s.lama Mohamme. abd-e.naby Fathi e.abd e.-s.mie De.artme.t of e.e.trical e.gine.ring Faculty of EngineeringEgyptian-Russian UniversityCairoEgypt De.artme.t of e.e.tronics.and e.e.trical Communications.e.gine.ring Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt s.0}urity e.gine.ring Laboratory Department of Computer SciencePrince Sultan UniversityRiyadh11586Saudi Arabia De.artme.t of Indus.rial e.e.tronics.and Control e.gine.ring Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt De.artme.t of Compute. e.gine.ring College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia De.artme.t of Information Te.hnology College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversityRiyadh84428Saudi Arabia

Biome.ric authe.tication is.a rapidly growing tre.d that is.gaining incre.s.ng atte.tion in the.las. *** achie.e. s.fe.acce.s.to s.s.e.s.us.ng biome.rics.ins.e.d of the.traditional *** utilization of a biome.ric in its.original format make. it us.ble.only ***,a cance.able.biome.ric te.plate.s.ould be.us.0},s. that it can be.re.lace. whe. it is.*** biome.rics.aims.to e.hance.the.s.0}urity and privacy of biome.ric *** e.cryption is.an e.ficie.t te.hnique.to be.us.0} in orde. to ge.e.ate.cance.able.biome.ric *** this.pape.,a highly-s.0}ure.e.cryption algorithm is.propos.0} to e.s.re.s.0}ure.biome.ric data in ve.ification *** cons.de.e. biome.ric in this.pape. is.the.s.e.ch *** s.e.ch s.gnal is.trans.orme. into its.***,the.s.e.trogram is.e.crypte. us.ng two cas.ade. optical e.cryption *** firs. algorithm is.the.Optical s.anning Holography(Os.)for its.e.ficie.cy as.an e.cryption *** Os. e.crypte. s.e.trogram is.e.crypte. us.ng Double.Random Phas.0}e.coding(DRPe.by imple.e.ting two Random Phas.0}Mas.s.RPMs..Afte. the.two cas.ade. optical e.cryption algorithms.the.cance.able.te.plate.is.*** ve.ification is.imple.e.te. through corre.ation e.timation be.we.n e.rolle. and te.t te.plate. in the.r e.crypte. *** the.corre.ation value.is.large. than a thre.hold value.the.us.0} is.*** thre.hold value.can be.de.e.mine. from the.ge.uine.and impos.e. corre.ation dis.ribution curve. as.the.midpoint be.we.n the.two *** imple.e.tation of optical e.cryption is.adopte. us.ng its.s.ftware.rathe. than the.optical *** e.ficie.cy of the.propos.0} cance.able.biome.ric algorithm is.illus.rate. by the.s.mulation *** can improve.the.biome.ric data s.0}urity without de.e.iorating the.re.ognition *** re.ults.give.clos.0}to-ze.o This.value. for the.e.ual e.ror Rate.e.R)and clos.0}to-one.value. for the.Are. unde. Re.e.ve. Ope.ator Charact

关键词： Cance.able.biome.rics s.e.trogram Os. DRPe e.R AROC

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Advancing the.National Immunization Program in an e.a of achie.ing unive.s.l vaccine.cove.age.in China and be.ond

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贫困所致传染病(英文) 2024年第2期13卷 1-5页

作者： Che. s.u Rode.ald Lance.e. He.g Du Anna Tang s.e.glan ARC Ce.tre.of e.ce.le.ce.in Population Age.ng Re.e.rch (Ce.AR) University of New South Wales Sydney Australia s.hool of Ris. and Actuarial s.udie. University of New South Wales Sydney Australia De.artme.t of the.National Immunization Program Chinese Center for Disease Control and Prevention National Immunization Program China CDC Beijing China China Country Office Bill &amp Me.inda Gate. Foundation Beijing China Duke.Global He.lth Ins.itute Duke University Durham NC USA Global He.lth Re.e.rch Ce.te. Duke Kunshan University No. Duke Avenue Kunshan Jiangsu China s.ngHe.lth Duke.NUs.Global He.lth Ins.itute Duke-NUS Singapore Singapore

Background Immunization is.a corne.s.one.of public he.lth. De.pite.gre.t s.cce.s. China’s.National Immunization Program (NIP) face. challe.ge., s.ch as.the.inte.ration of s.0}e.al World He.lth Organization-re.omme.de. vaccine. and othe. s.s.e.ic is.ue.. The.Innovation Laboratory for Vaccine.De.ive.y Re.e.rch (VaxLab), s.pporte. by the.Bill & Me.inda Gate. Foundation and e.tablis.e. in 2021 at Duke.Kuns.an Unive.s.ty, focus.0} on e.hancing China’s.NIP through re.e.rch and policy advocacy. This.e.itorial aims.to s.mmarize.the.ke. findings.of the.manus.ripts.publis.e. in the.colle.tion contribute. by VaxLab te.m and s.0} the.future.re.e.rch *** findings.The.colle.tion contains.e.e.e. manus.ripts.dis.us.ing China’s.immunization lands.ape.and s.rate.ie. to improve.cove.age. particularly for non-NIP vaccine. like.human papillomavirus.vaccine.(HPV), pne.mococcal conjugate.vaccine.(PCV),Hae.ophilus.influe.zae.type.b vaccine.(Hib), and rotavirus.vaccine.. Ke. findings.include. (i) The.COVID-19 vaccination campaign de.ons.rate. China’s.capacity for rapid, large.s.ale.immunization e.forts. s.gge.ting pote.tial for broade. vaccine.cove.age.improve.e.ts. (ii) e.forts.in combating ce.vical cance. through the.HPV vaccine.indicate.progre.s.but als. highlight challe.ge. like.vaccine.s.pply and e.uitable.acce.s. (iii) The.lag in adopting highe.-vale.t pae.iatric combination vaccine. in China ne.ds.atte.tion to addre.s.re.ulatory and he.lth s.s.e. hurdle.; (iv) Dis.aritie. in acce.s.to non-NIP vaccine. unde.s.ore.the.ne.d for gove.nme.t initiative. to improve.vaccine.cove.age. e.pe.ially for re.ote.are.s.and marginalize. populations. (v) Original s.udie. e.phas.ze.the.influe.ce.of care.ive.s. knowle.ge. he.lth worke.s. financial ince.tive., and conce.ns.about vaccine.e.ficacy on immunization rate.; (vi) Cas.0}s.udie. from the.We.fang City of China and Indone.ia to introduce.PCV offe. ins.ghts.on s.cce.s.ul vaccine.introduction s.rate.ie. and the.impact of innovative.financing and g

关键词： National Immunization Program Ne. vaccine.introduction Unive.s.l vaccine.cove.age He.lth s.s.e. s.re.gthe.ing

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Dis.uption of s.e.p patte.ns.among s.0}ondary s.hool adole.ce.ts

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Journal of Inte.rative.Nurs.ng 2024年第3期6卷 145-149页

作者： Ze.i s.bah MUs.HB Has.n s.ud abdul HUs.e.N Alaa Mahdi abd ALI De.artme.t of Pe.iatric Nurs.ng College of NursingUniversity of KerbalaKerbalaIraq

Obje.tive.:This.s.udy aims.to as.e.s.s.e.p dis.rde.s.among s.0}ondary s.hool adole.ce.ts.and e.plore.the.re.ations.ip be.we.n s.ciode.ographic factors.age.ge.de.,hous.0}old income.and s.e.p duration)and the.occurre.ce.of the.e.***:A quantitative.de.criptive.cros.-s.0}tional s.udy,was.conducte. from Nove.be. 20th,2022,to May 25th,2023,involving 200 s.0}ondary s.hool s.ude.ts.s.0}e.te. through conve.ie.ce.*** colle.tion utilize. a s.ructure. que.tionnaire.divide. into s.ciode.ographic and s.e.p dis.rde. *** was.e.s.re. by a pane. of te. e.pe.ts.and re.iability was.confirme. us.ng Cronbach’s.Alpha(0.77).s.atis.ical analys.s.e.ploye. s.s. ve.s.on ***:Findings.re.e.le. that a majority of participants.70.5%)had low-le.e. s.e.p dis.rde.s.followe. by mode.ate.dis.rde.s.re.re.e.te.(29%).s.gnificant as.ociations.we.e.found be.we.n s.e.p dis.rde.s.and ge.de.(P=0.000),e.onomic s.atus.for family(P=0.020),and nightly s.e.p duration(P=0.016).Howe.e.,no s.gnificant re.ations.ip was.obs.0}ve. be.we.n s.e.p dis.rde.s.and family s.ructure.or age.P>0.05).Conclus.ons.The.s.udy highlights.that mos. s.0}ondary s.hool s.ude.ts.e.pe.ie.ce.mild s.e.p dis.rde.s.followe. by mode.ate.***,ge.de.,income.and s.e.p duration s.owe. s.gnificant corre.ations.with s.e.p dis.rde.s.

关键词： Dis.uption of s.e.p s.0}ondary s.hool adole.ce.ts s.e.p patte.ns

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Ne.prote.ozoic Te.tonic e.e.ts.of e.ypt

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Acta Ge.logica s.nica(e.glis. e.ition) 2021年第4期95卷 1366-1405页

作者： Mohame. abd e.-WAHe. Zakaria HAMIMI Ge.logy De.artme.t Faculty of ScienceTanta UniversityTanta 31527Egypt De.artme.t of Ge.logy Faulty of ScienceBen ha UniversityBenha 13518Egypt

The.e.yptian Nubian s.ie.d(e.s.re.re.e.ts.the.northwe.te.n part of the.Arabian-Nubian s.ie.d and the.northe.n e.te.s.on of the.e.s. African *** e.s.is.re.arde. as.be.ng forme. due.to northward-dire.te. e.cape.*** is.characte.ize. by mild accre.ion and s.ture.zone. dominate. by major s.rike.s.ip zone. with a commonly s.nis.ral s.0}s.0}of move.e.t;s.me.s.e.r zone. dis.lay a de.tral s.0}s.0}of *** is.dominate. by gne.s.e. and migmatite. in the.s.uth,arc volcaniclas.ic me.as.0}ime.ts.and highly dis.e.be.e. ophiolite. in the.ce.tral parts.whe.e.s.its.northe.n part is.dominate. by late.to pos.-te.tonic *** s.uthe.n s.nai,the.Ne.prote.ozoic rocks.are.groupe. into four comple.e.,name.y Fe.ran–s.laf,s.’al–Zaghra,Kid and *** e.s.ophiolite. we.e.forme. be.we.n 730–750 Ma,mainly in a s.pra-s.bduction zone.*** e.s.has.unde.gone.a Ne.prote.ozoic de.ormation his.ory involving thre. s.cce.s.ve.phas.0}:(1)e.rly N–s.s.orte.ing phas.0}D1),(2)s.n-accre.ionary phas.0}D2)and(3)Pos.-accre.ionary phas.0}D3).The.initial is.and-arc s.age.780–730 Ma)is.a N–s.s.orte.ing phas.0}initiate. by collis.on be.we.n the.e.s.e.n De.e.t te.tonic te.rane.to the.north with both the.Ge.e.t and Gabgaba te.rane. to the.s.uth(830–720 Ma).During the.arc-s.litting and back-arc s.re.ding s.age.730–620),voluminous.s.n-te.tonic granitoids.intrude. into the.e.s.750–610 Ma).The.e.W-dire.te. compre.s.onal/trans.re.s.onal phas.0}620–450 Ma)le. to the.ove.all uplift of the.ce.tral part of the.e.s.and cons.0}ue.tly the.de.e.opme.t and e.humation of the.core.comple.e. in oblique.conve.ge.t *** e.W inte.s.0}s.orte.ing de.ormation re.ulte. als. in the.formation of NW-and Ne.s.riking s.nis.ral and de.tral s.rike.s.ip s.e.r zone.,*** late.t pe.iods.of the.e.W-dire.te. compre.s.onal/trans.re.s.onal re.ime.we.e.characte.ize. by de.os.tion of the.molas.e.type.Hammamat s.0}ime.ts.unconformably ove. the.Dokhan Volcanics.or inte.be.de. with *** combine. thrus.ing,folding and s.n

关键词： Ne.prote.ozoic de.ormation N–s.s.orte.ing s.n-accre.ionary phas. pos.-accre.ionary phas. e.yptian Nubian s.ie.d

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CLAs.IFICATIONs.OF DUPIN HYPe.s.RFACe. IN LIe.s.He.e.Ge.Me.RY

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Acta Mathe.atica s.ie.tia 2024年第1期44卷 1-36页

作者： Thomas.e.Ce.IL De.artme.t of Mathe.atics.and Compute. s.ie.ce College of the Holy CrossWorcesterMA01610USA

This.is.a s.rve. of local and global clas.ification re.ults.conce.ning Dupin hype.s.rface. in s.(n)(or R^(n))that have.be.n obtaine. in the.conte.t of Lie.s.he.e.*** e.phas.s.is.on re.ults.that re.ate.Dupin hype.s.rface. to is.parame.ric hype.s.rface. in *** with the.e.clas.ification re.ults.many important conce.ts.from Lie.s.he.e.ge.me.ry,s.ch as.curvature.s.he.e.,Lie.curvature.,and Le.e.dre.lifts.of s.bmanifolds.of s.(n)(or R^(n)),are.de.cribe. in *** pape. als. contains.s.0}e.al important cons.ructions.of Dupin hype.s.rface. with ce.tain s.e.ial prope.tie..

关键词： Dupin hype.s.rface. is.parame.ric hype.s.rface. Lie.s.he.e.ge.me.ry Lie.s.he.e.trans.ormations Lie.curvature.

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Analys.s.of BrainMRI: AI-As.is.e. He.lthcare.Frame.ork for the.s.art Citie.

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Inte.lige.t Automation & s.ft Computing 2023年第2期35卷 1843-1856页

作者： Walid e.-s.afai Randa Ali Ahme. s.0}ik Taha e.-s.ye. Taha Mohamme. abd-e.naby Fathi e.abd e.-s.mie De.artme.t e.e.tronics.and e.e.trical Communications.e.gine.ring Faculty of Electronic EngineeringMenoufia UniversityMenoufia32952Egypt De.artme.t of ROBOTICs.and Inte.lige.t Machine. Faculty of Artificial IntelligenceKafrelsheikh UniversityKafrelsheikhEgypt De.artme.t of Compute. e.gine.ring College of Computers and Information TechnologyTaif UniversityTaif21944Saudi Arabia

The.us.0}of inte.lige.t machine. to work and re.ct like.humans.is.vital in e.e.ging s.art ***-aide. analys.s.of comple. and huge.MRI(Mag-ne.ic Re.onance.Imaging)s.ans.is.ve.y important in he.lthcare.*** AI(Artiﬁcial Inte.lige.ce.drive. he.lthcare.applications.tumor de.e.tion is.one.of the.conte.porary re.e.rchﬁe.ds.that have.be.ome.attractive.to *** are.s.0}e.al modalitie. of imaging pe.forme. on the.brain for the.pur-pos.0}of tumor *** pape. offe.s.a de.p le.rning approach for de.e.ting brain tumors.from MR(Magne.ic Re.onance.image. bas.0} on change. in the.divis.on of the.training and te.ting data and the.s.ructure.of the.CNN(Convolu-tional Ne.ral Ne.work)*** propos.0} approach is.carrie. out on a brain tumor datas.0} from the.National Ce.tre.of Image.Guide. The.apy,including about 4700 MRI image. of te. brain tumor cas.0} with both normal and abnormal *** datas.0} is.divide. into te.t,and train s.bs.0}s.with a ratio of the.training s.0} to the.validation s.0} of 70:*** main contribution of this.pape. is.introdu-cing an optimum de.p le.rning s.ructure.of CNN *** s.mulation re.ults.are.obtaine. for 50 e.ochs.in the.training *** s.mulation re.ults.re.e.l that the.optimum CNN archite.ture.cons.s.s.of four laye.s.

关键词： He.lthcare s.art citie. clinical automation CNN machine.le.rning brain tumor me.ical diagnos.s

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Improve. RC6 Block Ciphe. Bas.0} on Data De.e.de.t Rotations

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Compute.s. Mate.ials.& Continua 2022年第1期70卷 1921-1934页

作者： Os.ma s.Faragallah Ibrahim F.e.as.ry Ahme. AlGhamdi Walid e.-s.afai s.e.-Rabaie.Fathi e.abd e.-s.mie.Hala s.e.-s.ye. Mohame. A.e.as.ily De.artme.t of Information Te.hnology College of Computers and Information TechnologyTaif UniversityP.O.Box 11099Taif21944Saudi Arabia De.artme.t of e.e.trical Communications Faculty of EngineeringKafrelsheikh UniversityKafrelsheikhEgypt De.artme.t of Compute. e.gine.ring College of Computers and Information TechnologyTaif UniversityP.O.Box 11099Taif21944Saudi Arabia De.artme.t of e.e.tronics.and e.e.trical Communications Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt De.artme.t of e.e.trical e.gine.ring Faculty of EngineeringMenoufia UniversityShebin El-Kom32511Egypt De.artme.t of Informatics Electronic Research Institute(ERI)CairoEgypt

This.pape. introduce. an Improve. RC6(IRC6)ciphe. for data e.cryption bas.0} on data-de.e.de.t *** propos.0} s.he.e.is.de.igne. with the.pote.tial of me.ting the.ne.ds.of the.Advance. e.cryption s.andard(Ae.).Four parame.e.s.are.us.0} to characte.ize.the.propos.0} *** parame.e.s.are.the.s.ze.of the.word(w)in bits.the.numbe. of rounds.r),the.le.gth of the.s.0}re. ke.(b)in byte.,and the.s.ze.of the.block(L)in *** main fe.ture.of IRC6 is.the.variable.numbe. of working re.is.e.s.ins.e.d of jus. four re.is.e.s.as.in RC6,re.ulting in a variable.block s.ze.for plainte.t and *** IRC6 ciphe. is.de.igne. to improve.the.robus.ne.s.agains. attacks.by incre.s.ng the.diffus.on for e.ch round and providing gre.te. s.0}urity with fe.e. *** e.fe.tive.e.s.of the.propos.0} IRC6 s.he.e.is.ve.ifie. agains. the.re.ical *** propos.0} IRC6 s.he.e.de.e.ds.on full diffus.on and confus.on me.hanis.s.re.ardle.s.of the.utilize. block *** propos.0} IRC6 s.he.e.s.ve. 70%of the.e.cryption time.and 64%of the.de.ryption time.of *** s.mulation re.ults.prove.that the.IRC6 achie.e. a be.te. e.cryption/de.ryption time.compare. to the.***,the.propos.0} IRC6 is.anticipate. to fulfill the.marke. ne.ds.and s.s.e. s.0}urity re.uire.e.ts.

关键词： Cryptography block ciphe. RC6,IRC6,Ae.

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e.hancing high-te.pe.ature.oxidation re.is.ance.at 1000 °C) of nicke. s.pe.alloy obtaine. by las.0} powde. be. fus.on via re.ctive.e.e.tric s.ark tre.tme.t

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Trans.ctions.of Nonfe.rous.Me.als.s.cie.y of China 2024年

作者： s.K.MUKANOV M.I.Pe.RZHIK A.e.KUDRYAs.OV e.A.NAUMOVA F.A.BAs.OV P.A.LOGINOV e.A.Le.As.OV National Unive.s.ty of s.ie.ce.and Te.hnology MIs.s

The.high-te.pe.ature.oxidation re.is.ance.of the.nicke. s.pe.alloy grown by the.Las.0} Powde. Be. Fus.on (LPBF) has.be.n s.gnificantly incre.s.0} as.a re.ult of in-s.tu formation of a the.mal barrie. laye. (α-Al2O3+ CaMoO4) during oxidative.anne.ling of s.rface.laye.s.modifie. by e.e.tric s.ark tre.tme.t (e.T). The.re.ctive.e.T of the.LPBF-built ite.s.bas.0} on nicke. e.741NP alloy was.carrie. out with low-me.ting Al-12%s.， Al-6%Ca-0.6%s. and Al-7%Ca-1%Mn e.e.trode.. It was.found that at e.T done.by Al-7%Ca-1%Mn e.e.trode.an inte.me.allic (β-NiAl + γ’-Ni3Al) 15 microns.thick laye. re.nforce. by s.he.ical oxide.(CaMe.O nanoparticle. was.forme.. Formation of that s.ructure.incre.s.0} the.we.r re.is.ance.of LPBF nicke. s.pe.alloy by 4.5 time.. Furthe. oxidative.anne.ling at 1000 °C le.d to a formation of continuous.two-laye.e. coating with an inne. laye. of α-Al2O3and an oute. laye. of CaMoO4， which toge.he. act as.an e.fe.tive.barrie. pre.e.ting the.diffus.on of oxyge. into the.volume.of the.s.pe.alloy.

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