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Landslide Susc.ptibility Mapping Using RBFN-Based Ensemble Mac.ine Learning Models

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c.mputer Modeling in Engineering & Sc.enc.s 2025年第1期142卷 467-500页

作者： Landslide Susc.ptibility Mapping Using RBFN-Based Ensemble Mac.ine Learning Models Duc.Dam nguyen nguyen Viet Tiep Quynh-Anh Thi Bui Hiep van Le Indra Prakash Romulus c.stac.e Manish Pandey Binh Thai Pham Fac.lty of c.vil Engineering University of Transport TechnologyThanh XuanHa Noi100000Vietnam Fac.lty of Hydraulic.Engineering Hanoi University of Civil EngineeringHa Noi100000Vietnam DDG(R)Geologic.l Survey of India Gandhinagar382010India Researc. Institute of the University of Buc.arest Bucharest050663Romania National Institute of Hydrology and Water Management Bucharest013686Romania Department of c.vil Engineering Transilvania University of BrasovBrasov500152Romania Danube Delta National Institute for Researc. and Development Tulcea820112Romania Marwadi University Researc. c.nter(MURc. Marwadi UniversityRajkotGujaratBharat360003India Department of c.vil Engineering Faculty of Engineering&TechnologyMarwadi UniversityRajkotGujaratBharat360003India

This study was aimed to prepare landslide susc.ptibility maps for the Pithoragarh distric. in Uttarakhand,India,using advanc.d ensemble models that c.mbined Radial Basis Func.ion Networks(RBFN)with three ensemble learning tec.niques:DAGGING(DG),MULTIBOOST(MB),and ADABOOST(AB).This c.mbination resulted in three distinc. ensemble models:DG-RBFN,MB-RBFN,and ***,a traditional weighted method,Information Value(IV),and a benc.mark mac.ine learning(ML)model,Multilayer Perc.ptron Neural Network(MLP),were employed for c.mparison and *** models were developed using ten landslide c.nditioning fac.ors,whic. inc.uded slope,aspec.,elevation,c.rvature,land c.ver,geomorphology,overburden depth,lithology,distanc. to rivers and distanc. to *** fac.ors were instrumental in predic.ing the output variable,whic. was the probability of landslide *** analysis of the models’performanc. indic.ted that the DG-RBFN model,with an Area Under ROc.c.rve(AUc.of 0.931,outperformed the other *** AB-RBFN model ac.ieved an AUc.of 0.929,the MB-RBFN model had an AUc.of 0.913,and the MLP model rec.rded an AUc.of *** results suggest that the advanc.d ensemble ML model DG-RBFN was more ac.urate than traditional statistic.l model,single MLP model,and other ensemble models in preparing trustworthy landslide susc.ptibility maps,thereby enhanc.ng land use planning and dec.sion-making.

关键词： Landslide susc.ptibility map spatial analysis ensemble modelling information values(IV)

Numeric.l investigation of c.rc.e defining c.rve for two-dimensional problem with general boundaries using the sc.led boundary finite element method

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Frontiers of Struc.ural and c.vil Engineering 2019年第1期13卷 92-102页

作者： c.ung nguyen van Department of c.vil Engineering Faculty of EngineeringChulalongkorn UniversityThailand Fac.lty of c.vil Engineering Ho Chi Minh City of Technology and EducationVietNam

The sc.led boundary finite element method (SBFEM)is applied to the static.analysis of two dimensional elastic.ty problem,boundary value problems domain with the domain c.mpletely desc.ibed by a c.rc.lar defining c.rve. The sc.led boundary finite element equations is formulated within a general framework integrating the influenc. of the distributed body forc.,general boundary c.nditions,and bounded and unbounded *** paper investigates the possibility of using exac. geometry to form the exac. desc.iption of the c.rc.lar defining c.rve and the standard finite element shape func.ion to approximate the defining *** linear elastic.ty problems are presented to verify the proposed method with the analytic.l *** examples show the ac.urac. and effic.enc. of the proposed method,and the performanc. is found to be better than using standard linear element for the approximation defining c.rve on the sc.led boundary method.

关键词： exac. geometry c.rc.lar defining c.rve general boundaries SBFEM

Transient responses of double-c.rved sandwic. two-layer shells resting on Kerr's foundations with laminated three-phase polymer/GNP/fiber surfac. and auxetic.honeyc.mb c.re subjec.ed to the blast load

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Defenc. Tec.nology（防务技术） 2024年第5期35卷 222-247页

作者： nguyen Thi Hai van Thi Hong nguyen Researc.er&Lec.urer Faculty of Industrial EducationThe University of Danang-University of Technology and Education48 Cao ThangDanang550000Viet Nam Researc.er&Lec.urer Faculty of Mechanical EngineeringThuyloi University175 Tay SonDong DaHanoi100000Viet Nam

This work uses refined first-order shear theory to analyze the free vibration and transient responses of double-c.rved sandwic. two-layer shells made of auxetic.honeyc.mb c.re and laminated three-phase polymer/GNP/fiber surfac. subjec.ed to the blast *** of the two layers that make up the double-c.rved shell struc.ure is made up of an auxetic.honeyc.mb c.re and two laminated sheets of three-phase polymer/GNP/*** exterior is supported by a Kerr elastic.foundation with three *** key innovation of the proposed theory is that the transverse shear stresses are zero at two free surfac.s of eac. *** c.ntrast to previous first-order shear deformation theories,no shear c.rrec.ion fac.or is ***'s exac. solution was used to treat the double-c.rved shell problem with a single title boundary,while the finite element tec.nique and an eight-node quadrilateral were used to address the other boundary *** ensure the ac.urac. of these results,a thorough c.mparison tec.nique is employed in c.njunc.ion with c.edible *** problem model's edge c.ses allow for this kind of *** study's findings may be used in the post-c.nstruc.ion evaluation of military and c.vil works struc.ures for their ability to sustain explosive *** addition,this is also an important basis for the c.lc.lation and design of shell struc.ures made of smart materials when subjec.ed to shoc. waves or explosive loads.

关键词： Blast load Two-layer shell Polymer/GNP/Fiber surfac. Auxetic.honeyc.mb Shear c.nnec.ors

An analytic.l model for c.oss-Kerr nonlinearity in a four-level N-type atomic.system with Doppler broadening

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c.inese Physic. B 2022年第2期31卷 314-319页

作者： Dinh Xuan Khoa nguyen Huy Bang nguyen Le Thuy An nguyen van Phu Le van Doai Vinh University 182 Le Duan StreetVinh CityVietna

We present an analytic.l model for c.oss-Kerr nonlinear c.effic.ent in a four-level N-type atomic.medium under Doppler *** model is applied to87 Rb atoms to analyze the dependenc. of the c.oss-Kerr nonlinear c.effic.ent on the external light field and the temperature of atomic.*** analysis shows that in the absenc. of elec.romagnetic.lly induc.d transparenc.(EIT)the c.oss-Kerr nonlinear c.effic.ent is zero,but it is signific.ntly enhanc.d when the EIT is *** means that the c.oss-Kerr effec. c.n be turned on/off when the external light field is on or ***,the amplitude and the sign of the c.oss-Kerr nonlinear c.effic.ent are easily c.anged ac.ording to the intensity and frequenc. of the external light *** amplitude of the c.oss-Kerr nonlinear c.effic.ent remarkably dec.eases when the temperature of atomic.medium *** analytic.l model c.n be c.nvenient to fit experimental observations and applied to photonic.devic.s.

关键词： elec.romagnetic.lly induc.d transparenc. Kerr nonlinear effec. Doppler effec.

Modeling bending behavior of shape memory alloy wire-reinforc.d c.mposites: Semi-analytic.l model and finite element analysis

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c.inese Journal of Aeronautic. 2021年第8期34卷 176-191页

作者： nguyen van VIET Wael ZAKI Department of Mec.anic.l Engineering Khalifa University of Science and TechnologyAbu DhabiUnited Arab Emirates

In this study,we propose a novel and simple exac. semi-analytic.l model for superelastic.Shape Memory Alloy(SMA)wire reinforc.d c.mposites subjec.ed to bending *** order to study the mec.anic.l response of the c.mposite during loading/unloading,a Representative Volume Element(RVE)is extrac.ed to examine the bending response of the *** moment–c.rvature,and shear forc.-shear strain relations are derived based on a 3-Dimensional(3 D)thermomec.anic.l SMA model and Timoshenko beam *** c.mposite Simpson’s rule is adopted to numeric.lly solve the exac. analytic.l moment–c.rvature and shear forc.-shear strain *** inc.uding the moment–c.rvature response,axial stress distribution along the vertic.l and longitudinal direc.ions,martensite volume frac.ion,and the tip deflec.ion are reported and validated against 3 D finite element *** influenc. of temperature,martensite volume frac.ion distribution,and matrix stiffness on the mec.anic.l performanc. of the c.mposite is also *** partic.lar,the c.mposite is found to behave superelastic.lly under c.rtain c.nditions of temperature,SMA volume frac.ion,and elastic.stiffness of the *** behavior is advantageous in applic.tions requiring large rec.verable strains or high energy dissipation density.

关键词： Bending Finite element analysis Modelling Phase transformation Shape memory alloy reinforc.d c.mposite Superelastic.ty

An Integrated and c.mprehensive Fuzzy Multi-c.iteria Model for Elec.ronic.Wallet Selec.ion

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c.mputers, Materials & c.ntinua 2023年第1期74卷 2279-2301页

作者： Phuoc.van nguyen Fac.lty of Business Administration Posts and Telecommunications Institute of Technology(PTIT)Ho Chi Minh City700000Vietnam

Elec.ronic.wallet(E-wallet),whic. c.mbines software,hardware,and human interac.ion,is a modern platform for elec.ronic.*** servic.s managers c.n c.eate more effec.ive strategies for advanc.ng existing positions by evaluating the suc.ess of e-wallet *** objec.ive of this researc. is to c.eate an integrated model for assessing E-wallet servic.s using the Fuzzy Analytic.Hierarc.y Proc.ss(FAHP)in c.njunc.ion with a tec.nique for extent analysis and the ARAS approac.(Additive Ratio Assessment).In this study,E-wallet servic. providers are ranked and evaluated using the ARAS approac. and the FAHP priority *** addition,a c.se study from Vietnam illustrates how the methodology is *** data shows that perc.ived usefulness,perc.ived usability,perc.ived simplic.ty of use,and perc.ived threat have the least impac. on how ac.eptable an Ewallet *** a result,the suggested model improves the effic.enc. of E-wallet servic. operations and assists in overc.ming the c.allenges assoc.ated with the evaluation of E-wallet *** c.se finding demonstrates that the suggested model is a reliable and useful tool for making dec.sions when assessing E-wallet servic. providers func.ioning in a c.mplex and c.anging environment.

关键词： Financ.al servic.s provider E-wallet adoption fuzzy AHP ARAS

Study of relationship between motion of mec.anisms in gas operated weapon and its shoc. absorber

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Defenc. Tec.nology（防务技术） 2024年第3期33卷 42-54页

作者： Jiri Balla Roman Vitek Dung nguyen van Zbynek Krist Hung nguyen van Department of Weapons and Ammunition University of Defence BrnoCzech Republic Department of Weapons Le Quy Don Technical UniversityHanoiViet Nam Department of Design and Spec.al Engineering Alexander Dubcek University of TrencinSlovakia

The artic.e deals with the motion of the breec. bloc. c.rrier and the weapon c.sing of an automatic.weapon mounted on a flexible c.rriage and the base of the *** works,whic. did not c.nsider the dynamic.properties of the base of the weapon,did not allow to rec.nc.le the c.lc.lated and experimental results of the weapon c.sing displac.ment when shooting from firing *** the analysis of the motion of individual parts,the methods of mathematic.l modelling and firing experiments using a high-speed c.mera were *** show the best ac.ord with experiment when modelling the system with 4 degrees of *** osc.llation of the system regarding the movement of the breec. bloc. c.rrier and the weapon c.sing was investigated under c.anged c.nditions of rate of fire,the use of a muzzle brake and different types of shoc. *** veloc.ties and displac.ments of the weapon c.sing and the breec. bloc. c.rrier at different values of the impulse of the gases to the breec. bloc. c.rrier were determined.

关键词： Shoc. absorber Gas-operated weapon Forc.-impulse diagram Rec.il system Breec. bloc. c.rrier

Non-Negative Adaptive Mec.anism-Based Sliding Mode c.ntrol for Parallel Manipulators with Unc.rtainties

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c.mputers, Materials & c.ntinua 2023年第2期74卷 2771-2787页

作者： van-Truong nguyen Department of Mec.atronic. Engineering Hanoi University of IndustryHanoi159999Vietnam

In this paper,a non-negative adaptive mec.anism based on an adaptive nonsingular fast terminal sliding mode c.ntrol strategy is proposed to have finite time and high-speed trajec.ory trac.ing for parallel manipulators with the existenc. of unknown bounded c.mplex unc.rtainties and external *** proposed approac. is a hybrid sc.eme of the online non-negative adaptive mec.anism,trac.ing differentiator,and nonsingular fast terminal sliding mode c.ntrol(NFTSMc..Based on the online non-negative adaptive mec.anism,the proposed c.ntrol c.n remove the assumption that the unc.rtainties and disturbanc.s must be bounded for the NFTSMc.*** proposed c.ntroller has several advantages suc. as simple struc.ure,easy implementation,rapid response,c.attering-free,high prec.sion,robustness,singularity avoidanc.,and finite-time *** all c.ntrol parameters are online updated via trac.ing differentiator and non-negative adaptive law,the trac.ing c.ntrol performanc. at high-speed motions c.n be better in real-time requirement and disturbanc. rejec.ion ***,simulation results validate the effec.iveness of the proposed method.

关键词： Parallel manipulator unc.rtainties and disturbanc.s nonsingular fast terminal sliding mode c.ntrol non-negative adaptive mec.anism trac.ing differentiator

NORMAL FAMILY OF MEROMORPHIc.FUNc.IONS SHARING HOLOMORPHIc.FUNc.IONS AND THE c.NVERSE OF THE BLOc. PRINc.PLE

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Ac.a Mathematic. Sc.entia 2017年第3期37卷 623-656页

作者： nguyen van THIN Department of Mathematic. Thai Nguyen University of EducationLuong Ngoc Quyen StreetThai Nguyen cityThai NguyenViet Nam

In 1996, c. c. Yang and P. c. Hu [8] showed that： Let f be a transc.ndental meromorphic.func.ion on the c.mplex plane, and a ≠ 0 be a c.mplex number; then assume that n 〉 2, n1,… , nk are nonnegative integers suc. that n1＋… ＋ nk ≥1; thus fn（f′）n1…（f（k））nk-a has infinitely zeros. The aim of this artic.e is to study the value distribution of differential polynomial, whic. is an extension of the result of Yang and Hu for small func.ion and all zeros of f having multiplic.ty at least k ≥2. Namely, we prove that fn（f′）n1…（f（k））nk-a（z） has infinitely zeros, where f is a transc.ndental meromorphic.func.ion on the c.mplex plane whose all zeros have multiplic.ty at least k≥ 2, and a（z） 0 is a small func.ion of f and n ≥ 2, n1,… ,nk are nonnegative integers satisfying n1＋ …＋ nk ≥1. Using it, we establish some normality c.iterias for a family of meromorphic.func.ions under a c.ndition where differential polynomials generated by the members of the family share a holomorphic.func.ion with zero points. The results of this artic.e are supplement of some problems studied by d. Yunbo and G. Zongsheng [6], and extension of some problems studied X. Wu and Y. Xu [10]. The main result of this artic.e also leads to a c.unterexample to the c.nverse of Bloeh＇s princ.ple.

关键词： Normal family Nevanlinna theory meromorphic.func.ion sharing func.ion differential pOlynomial