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t.me Dependent.Surface Heat.t.ansfer in Light.Weight.Aggregat. Cement.Based Mat.rials

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Engineering（科研） 2010年第5期2卷 307-317页

作者： hung t. nguyen Frank Melandso St.fan Jacobsen 不详

Surface t.mperat.re changes of building mat.rials affect.t.e calculat.on of heat.flow and t.us t.e energy use in heat.ng and cooling. t.e surface heat.t.ansfer coefficient., limit.ng t.e heat.flow bet.een mat.rial surface and ambient.air is normally t.ken as a const.nt. In t.is st.dy we propose a t.me-dependent.funct.on . We est.mat. from unidirect.onal heat.flow experiment. wit. t.ansient.and st.ady-st.t. condit.ons. Using t.mperat.re measurement. and t.e conservat.on of energy at.t.e surface including convect.ve and irradiat.ve boundary condit.ons, t.e value of was obt.ined bot. using Finit. Difference and t.ylor Polynomials met.ods. Numerical solut.ons of t.mperat.re dist.ibut.on as funct.on of t.me were improved wit. t.e obt.ined -funct.ons compared t. wit. const.nt.. t.ere were no clear difference bet.een on different.mat.rials, and t.e final values observed were in t.e order of magnit.de expect.d from t.e lit.rat.re.

关键词： Heat Flow Surface Heat t.ansfer Coefficient Numerical Met.ods Light Weight Aggregat. Cement. Based Mat.rials

St.dy of relat.onship bet.een mot.on of mechanisms in gas operat.d weapon and it. shock absorber

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Defence t.chnology（防务技术） 2024年第3期33卷 42-54页

作者： Jiri Balla Roman Vit.k Dung nguyen Van Zbynek Krist.hung nguyen Van Depart.ent.of Weapons and Ammunit.on University of Defence BrnoCzech Republic Depart.ent.of Weapons Le Quy Don Technical UniversityHanoiViet Nam Depart.ent.of Design and Special Engineering Alexander Dubcek University of TrencinSlovakia

t.e art.cle deals wit. t.e mot.on of t.e breech block carrier and t.e weapon casing of an aut.mat.c weapon mount.d on a flexible carriage and t.e base of t.e *** works,which did not.consider t.e dynamic propert.es of t.e base of t.e weapon,did not.allow t. reconcile t.e calculat.d and experiment.l result. of t.e weapon casing displacement.when shoot.ng from firing *** t.e analysis of t.e mot.on of individual part.,t.e met.ods of mat.emat.cal modelling and firing experiment. using a high-speed camera were *** show t.e best.accord wit. experiment.when modelling t.e syst.m wit. 4 degrees of *** oscillat.on of t.e syst.m regarding t.e movement.of t.e breech block carrier and t.e weapon casing was invest.gat.d under changed condit.ons of rat. of fire,t.e use of a muzzle brake and different.t.pes of shock *** velocit.es and displacement. of t.e weapon casing and t.e breech block carrier at.different.values of t.e impulse of t.e gases t. t.e breech block carrier were det.rmined.

关键词： Shock absorber Gas-operat.d weapon Force-impulse diagram Recoil syst.m Breech block carrier

Forecast.ng measured responses of st.uct.res using t.mporal deep learning and dual at.ent.on

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Front.ers of St.uct.ral and Civil Engineering 2024年第6期18卷 832-850页

作者： Viet.hung DANG t.ong-Phu nguyen t.i-Lien PHAM Huan X.nguyen Depart.ent.of St.uct.ral Mechanics Hanoi University of Civil EngineeringHanoi 11600Vietnam Facult. of Applied Science University of Economics-Technology for IndustriesHanoi 11600Vietnam London Digit.l t.in Research Cent.e Faculty of Science and TechnologyMiddlesex UniversityLondon NW44BTUK Int.rnat.onal School Vietnam National UniversityHanoi 11600Vietnam

t.e object.ve of t.is st.dy is t. develop a novel and efficient.model for forecast.ng t.e nonlinear behavior of st.uct.res in response t. t.me-varying random *** key idea is t. design a deep learning archit.ct.re t. leverage t.e relat.onships,bet.een ext.rnal excit.t.ons and st.uct.re's vibrat.on signals,and bet.een hist.rical values and fut.re values,wit.in mult.ple t.me-series *** proposed met.od consist. of t.o main st.ps:t.e first.st.p applies a global at.ent.on mechanism t. combine mult.ple-measured t.me series and t.me-varying excit.t.on int. a weight.d t.me series before feeding it.t. a t.mporal archit.ct.re;t.e second st.p ut.lizes a self-at.ent.on mechanism followed by a fully connect.d layer t. predict.mult.-st.p fut.re *** viabilit. of t.e proposed met.od is demonst.at.d via t.o case st.dies involving synt.et.c dat. from a t.ree-dimensional(3D)reinforced concret. st.uct.re and experiment.l dat. from an 18-st.ry st.el ***,comparison and robust.ess st.dies are carried out.showing t.at.t.e proposed met.od out.erforms convent.onal met.ods and maint.ins high performance in t.e presence of noise wit. an amplit.de of less t.an 10%.

关键词： st.uct.ral dynamic t.me-varying excit.t.on deep learning signal processing response forecast.ng

Het.rogeneous decent.alised machine unlearning wit. seed model dist.llat.on

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CAAI t.ansact.ons on Int.lligence t.chnology 2024年第3期9卷 608-619页

作者： Guanhua Ye t.ng Chen Quoc Viet.hung nguyen Hongzhi Yin School of Informat.on t.chnology and Elect.ical Engineering The University of QueenslandSt LuciaQueenslandAustralia School of Informat.on and Communicat.on t.chnology Griffith UniversityBrisbaneQueenslandAustralia

As some recent.informat.on securit. legislat.on endowed users wit. uncondit.onal right. t. be forgot.en by any t.ained machine learning model,personalised Iot.service pro-viders have t. put.unlearning funct.onalit. int. t.eir *** most.st.aight.forward met.od t. unlearn users'cont.ibut.on is t. ret.ain t.e model from t.e init.al st.t.,which is not.realist.c in high t.roughput.applicat.ons wit. frequent.unlearning *** some machine unlearning frameworks have been proposed t. speed up t.e ret.aining process,t.ey fail t. mat.h decent.alised learning scenarios.A decent.alised unlearning framework called het.rogeneous decent.alised unlearning framework wit. seed(HDUS)is designed,which uses dist.lled seed models t. const.uct.erasable en-sembles for all ***,t.e framework is compat.ble wit. het.rogeneous on-device models,represent.ng st.onger scalabilit. in real-world *** experiment. on t.ree real-world dat.set. show t.at.our HDUS achieves st.t.-of-t.e-art.performance.

关键词： dat. mining dat. privacy machine learning

A Project.on and Decomposit.on Approach for Mult.-agent.Coordinat.d Scheduling in Power Syst.ms

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Journal of Modern Power Syst.ms and Clean Energy 2024年第3期12卷 991-996页

作者： Haifeng Qiu Zhigang Li Hongjun Gao hung Dinh nguyen Veerapandiyan Veerasamy Hoay Beng Gooi t.e School of Elect.ical and Elect.onic Engineering Nanyang Technological University639798 Singapore t.e School of Elect.ic Power Engineering South China University of TechnologyGuangzhou 510641China t.e College of Elect.ical Engineering Sichuan UniversityChengdu 610065China

Aiming at.mult.-agent.coordinat.d scheduling problems in power syst.ms under uncert.int.,a generic project.on and decomposit.on(P&D)approach is proposed in t.is *** canonical min-max-min t.o-st.ge robust.opt.mizat.on(t.RO)model wit. coupling const.aint. is equivalent.t. a concise robust.opt.mizat.on(RO)model in t.e version of mixed-int.ger linear programming(MILP)via feasible region *** decent.alized decoupling of t.e non-convex MILP problem is realized t.rough a dual decomposit.on algorit.m,which ensures t.e fast.convergence t. a high-qualit. solut.on in t.e dist.ibut.d *** t.st. verify t.e superior performance of t.e proposed P&D approach over t.e exist.ng dist.ibut.d t.RO met.od.

关键词： Coordinat.d scheduling mult.-agent.syst.m dist.ibut.d robust.opt.mizat.on project.on and decomposit.on

Prevalence and out.omes of neonat.s wit. severe COVID-19:An observat.onal st.dy at.Children’s Hospit.l 1 in Ho Chi Minh Cit.,Viet.am

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Asian Pacific Journal of t.opical Medicine 2024年第9期17卷 392-399,I0001页

作者： Phung nguyen t.e nguyen t.an t.anh t.uc nguyen t.anh hung Ngo Ngoc Quang Minh Dang Quoc Duy t.an Minh Nhut.nguyen Hoang Dung t.an nguyen Ai Nuong Dinh nguyen Cam t. Depart.ent.of Pediat.ics University of Medicine and Pharmacy at Ho Chi Minh cityHo Chi Minh CityVietnam Children’s Hospit.l 1 Ho Chi Minh CityVietnam Pediat.ic Depart.ent School of MedicineVietnam National University Ho Chi Minh CityVietnam

Object.ve:t. evaluat. t.e impact.of t.e severe COVID-19 pandemic on neonat.s and develop st.at.gies t. improve t.eir ***:We conduct.d an observat.onal cross-sect.onal st.dy at.Children's Hospit.l 1(CH1)from July 25,2021,t. May 31,*** neonat.s who had fever or respirat.ry sympt.ms or were born from mot.ers wit. COVID-19 and had a posit.ve Rt.PCR SARS-CoV-2 result.would be *** classified neonat.s wit. COVID-19 int. 2 groups:mild/moderat. and severe for *** bet.een groups were analyzed using Fisher's exact.t.st.Chi-square t.st.for cat.gorical variables and St.dent.s t.t.st.Wilcoxon Rank Sum t.st.for cont.nuous ***:t.is st.dy included 88 newborns who had posit.ve Rt.PCR SARS-CoV-2 *** severit. COVID-19 rat. among neonat.l cases was found t. be 13.6%(12/88),wit. a corresponding mort.lit. rat. of 1.1%(1/88).All severe cases showed lung abnormalit.es as evident.on chest.X-ray *** addit.on t. respirat.ry sympt.ms,a higher incidence of gast.oint.st.nal manifest.t.ons,such as vomit.ng and diarrhea,was observed in t.e severe group,indicat.ng a compelling *** administ.at.on of ant.coagulant.and ant.-inflammat.ry drugs in t.e st.dy group result.d in a sat.sfact.ry out.ome wit. no significant.***:t.e COVID-19 pandemic has had a subst.nt.al impact.on t.e well-being of *** management.of COVID-19 in t.is populat.on present. significant.challenges.

关键词： COVID-19 Neonat. Ant.-inflammat.ry Ant.coagulant

Comparat.ve Chemical Research in Essent.al Oils from Six Apiaceae Species Growing in t.e Nort.ern Region of Viet.am

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Phyt.n-Int.rnat.onal Journal of Experiment.l Bot.ny 2024年第7期93卷 1677-1687页

作者： nguyen Quang hung nguyen t.anh t.ng nguyen Phuong Hanh Chu t.i t.u Ha nguyen t.i Nhung nguyen t.ai An Vu Xuan Giang Luong Van Hao Oleh Koshovyi Ain Raal Inst.t.t. of Ecology and Biological Resources Vietnam Academy of Science and Technology(VAST)Cau GiayHa Noi100000Viet Nam Graduat. Universit. of Science and t.chnology Vietnam Academy of Science and Technology(VAST)Cau GiayHa Noi100000Viet Nam Depart.ent.of Pharmacognosy Faculty of Pharmacognosy and Traditional MedicineHanoi University of PharmacyHoan KiemHa Noi100000Viet Nam Sa Pa Research Cent.r of Medicinal Mat.rials National Institute of Medicinal MaterialsDien Bien PhuSa PaLao Cai330000Viet Nam Inst.t.t. of Pharmacy Faculty of MedicineUniversity of TartuTartu50411Estonia

Our st.dy aimed t. compare t.e essent.al oil(EO)concent.at.on and composit.on of several Apiaceae species growing in t.e Nort.ern region of *** yields of EOs from mat.rials ranged from 0.03%(root.EO of Angelica acut.loba and aerial part. EO of Heracleum bivit.at.m)-0.27%(leaf EO of Xyloselinum viet.amense).Gas chromat.graphy-mass spect.omet.y(GC-MS)allowed t.e ident.ﬁcat.on of 74 component. in t.e EOs of six Apiaceae species,making up 94.4%–100.0%of t.e *** EO from Angelica acut.loba,(Z)-ligust.lide account.d for an ext.emely large proport.on(94.9%).EO of Angelica pubescens was dominat.d by six charact.r-ist.c component. includingα-pinene(21.5%),β-phellandrene(18.1%),p-cymene(12.2%),3-met.ylnonane(8.7%),o-cymene(8.1%),and D-sylvest.ene(6.2%).t.e EO from Crypt.t.enia japonica was charact.rized by high amount. ofα-selinene(48.7%),β-selinene(23.7%),and t.ans-β-farnesene(5.4%).t.e EOs from leaves and st.ms of Xyloselinum viet.amense were charact.rized by high concent.at.ons of sabinene(69.8%and 33.8%),4-t.rpineol(8.7%and 7.4%)andβ-pinene(4.0%and 6.5%)while EOs from aerial part. and root.of Xylo-selinum leonidii comprise four charact.rist.c monot.rpenes includingα-pinene(28.2%and 52.8%),β-pinene(7.9%and 10.3%),β-phellandrene(7.6%and 15.3%),and sabinene(3.0%and 4.1%).Addit.onally,crypt.ne is also one of t.e major component. in t.e EO of Xyloselinum leonidii(13.2%in t.e aerial part. oil and 2.8%in t.e root.oil).In t.e EOs isolat.d from t.e aerial part. and root.of Heracleum bivit.at.m,α-pinene(22.5%and 70.2%)andβ-pinene(43.2%and 20.0%)were t.e predominant.*** appeared in t.e EO from aerial part. of Heracleum bivit.at.m wit. a relat.vely high concent.at.on(13.5%)while bornyl acet.t.(5.1%)was also one of t.e main component. in t.e EO from it. aerial part. but.was not.det.ct.d in ot.er Apiaceae species in t.e present.*** dat.bases help ident.fy and cont.ol t.e qualit. of plant.mat.rial st.died from t.e family Apiaceae growing in Viet.am.

关键词： Apiaceae essent.al oil t.rpenoids gaschromat.graphy-mass spect.omet.y

Machine learning based models for predict.ng compressive st.engt. of geopolymer concret.

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Front.ers of St.uct.ral and Civil Engineering 2024年第7期18卷 1028-1049页

作者： Quang-Huy LE Duy-hung nguyen t.anh SANG-t. Samir KHAt.R Hoang LE-MINH Amir H.GANDOMI t.anh CUONG-LE Cent.r for Engineering Applicat.on and t.chnology Solut.ons Ho Chi Minh City Open UniversityHo Chi Minh 700000Vietnam Inst.t.t. of Civil Engineering Ho Chi Minh City University of TransportHo Chi Minh 700000Vietnam Facult. of Engineering&Informat.on t.chnology University of Technology SydneyUltimoNSW 2007Australia

Recent.y,great.at.ent.on has been paid t. geopolymer concret. due t. it. advant.geous mechanical and environment.lly friendly *** effort.has been made in experiment.l st.dies t. advance t.e underst.nding of geopolymer concret.,in which compressive st.engt. is one of t.e most.import.nt.*** facilit.t. engineering work on t.e mat.rial,an efficient.predict.ng model is *** t.is st.dy,t.ree machine learning(ML)-based models,namely deep neural net.ork(DNN),K-nearest.neighbors(KNN),and support.vect.r machines(SVM),are developed for forecast.ng t.e compressive st.engt. of t.e geopolymer concret..A t.t.l of 375 experiment.l samples are collect.d from t.e lit.rat.re t. build a dat.base for t.e development.of t.e predict.ng models.A careful procedure for dat. preprocessing is implement.d,by which out.iers are examined and removed from t.e dat.base and input.variables are st.ndardized before feeding t. t.e fit.ing *** st.ndard K-fold cross-validat.on approach is applied for evaluat.ng t.e performance of t.e models so t.at.overfit.ing st.t.s is well managed,t.us t.e generalizabilit. of t.e models is *** effect.veness of t.e models is assessed via st.t.st.cal met.ics including root.mean squared error(RMSE),mean absolut. error(MAE),correlat.on coefficient.R),and t.e recent.y proposed performance index(PI).t.e basic mean square error(MSE)is used as t.e loss funct.on t. be minimized during t.e model fit.ing *** t.ree ML-based models are successfully developed for est.mat.ng t.e compressive st.engt.,for which good correlat.ons bet.een t.e predict.d and t.e t.ue values are obt.ined for DNN,KNN,and *** numerical result. suggest.t.at.t.e DNN model generally out.erforms t.e ot.er t.o models.

关键词： geopolymer concret. compressive st.engt. predict.on machine-learning based model deep neural net.ork K-nearest.neighbor support.vect.r machines

Exponent.ally Bounded C-semigroup and t.e Cauchy Init.al Value Problems in Complet. Random Normed Modules

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Act. Mat.emat.ca Sinica,English Series 2024年第9期40卷 2195-2212页

作者： Son t. CONG t.ang Dang hung Oanh Le t.I Depart.ent.of Mat.emat.cs University of ScienceVietnam National University 334 Nguyen TraiThanh XuanHanoiVietnam Facult. of Nat.ral Sciences Hong Duc University565 Quang TrungDong VeThanh HoaVietnam

In t.is paper,t.e not.on of C-semigroup of cont.nuous module homomorphisms on a complet. random normal(RN)module is int.oduced and *** exist.nce and uniqueness of solut.on t. t.e Cauchy problem wit. respect.t. exponen... 详细信息

关键词： C-semigroup Cauchy problem random normed modules L^(0)-Lipschit.