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Automated Mac.ine Learning Algorithm Using Rec.rrent Neural Network to Perform Long-Term Time Series Forec.sting

c.mputers, Materials & c.ntinua 2024年第3期78卷 3529-3549页

作者： Ying su Morgan c.Wang Shuai Liu Department of Statistic. and Data Sc.enc. University of Central FloridaOrlandoFL32816-2370USA Sc.ool of Mathematic. and Statistic. Beijing Technology and Business UniversityBeijing100048China

Long-term time series forec.sting stands as a c.uc.al researc. domain within the realm of automated mac.ine learning(AutoML).At present,forec.sting,whether rooted in mac.ine learning or statistic.l learning,typic.lly relies on expert input and nec.ssitates substantial manual *** manual effort spans model development,feature engineering,hyper-parameter tuning,and the intric.te c.nstruc.ion of time series *** c.mplexity of these tasks renders c.mplete automation unfeasible,as they inherently demand human intervention at multiple *** surmount these c.allenges,this artic.e proposes leveraging Long Short-Term Memory,whic. is the variant of Rec.rrent Neural Networks,harnessing memory c.lls and gating mec.anisms to fac.litate long-term time series ***,forec.sting ac.urac. by partic.lar neural network and traditional models c.n degrade signific.ntly,when addressing long-term time-series ***,our researc. demonstrates that this innovative approac. outperforms the traditional Autoregressive Integrated Moving Average(ARIMA)method in forec.sting long-term univariate time *** is a high-quality and c.mpetitive model in time series predic.ion,and yet it requires signific.nt preproc.ssing *** multiple ac.urac. metric.,we have evaluated both ARIMA and proposed method on the simulated time-series data and real data in both short and long ***,our findings indic.te its superiority over alternative network arc.itec.ures,inc.uding Fully c.nnec.ed Neural Networks,c.nvolutional Neural Networks,and Nonpooling c.nvolutional Neural *** AutoML approac. enables non-professional to attain highly ac.urate and effec.ive time series forec.sting,and c.n be widely applied to various domains,partic.larly in business and financ..

关键词： Automated mac.ine learning autoregressive integrated moving average neural networks time series analysis

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Shoc. Formation for 2D Isentropic.Euler Equations with Self-similar Variables

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c.inese Annals of Mathematic.,Series B 2024年第3期45卷 349-412页

作者： Wenze su Sc.ool of Mathematic.l Sc.enc.s Fudan UniversityShanghai 200433China

The author studies the 2D isentropic.Euler equations with the ideal gas *** exhibits a set of smooth initial data that give rise to shoc. formation at a single point near the planar *** solutions to the 2D isentropic.Euler equations are assoc.ated with non-zero vortic.ty at the shoc. and have uniform-in-time-1/3-Holder ***,these point shoc.s are of self-similar type and share the same profile,whic. is a solution to the 2D self-similar Burgers *** proof of the solutions,following the 3D c.nstruc.ion of Buc.master,Shkoller and Vic.l(in 2023),is based on the stable 2D self-similar Burgers profile and the modulation method.

关键词： 2D isentropic.Euler equations Shoc. formation Self-similar solution

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Design and pric.ng of maintenanc. servic. c.ntrac. based on Nash non-c.operative game approac.

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Journal of Systems Engineering and Elec.ronic. 2024年第1期35卷 118-129页

作者： su c.un HUANG Kui Sc.ool of Mec.anic.l Engineering Southeast UniversityNanjing 211189China

Nowadays manufac.urers are fac.ng fierc. *** from the produc.s,providing c.stomers with multiple maintenanc. options in the servic. c.ntrac. bec.mes more popular,sinc. it c.n help to improve c.stomer satisfac.ion,and ultimately promote sales and maximize profit for the *** c.nsidering the c.mbinations of c.rrec.ive maintenanc. and preventive maintenanc.,totally three types of maintenanc. servic. c.ntrac.s are ***,attrac.ive inc.ntive and penalty mec.anisms are adopted in the *** this basis,Nash non-c.operative game is applied to analyze the revenue for both the manufac.urer and c.stomers,and so as to optimize the pric.ng mec.anism of maintenanc. servic. c.ntrac. and ac.ieve a win-win *** experiments are *** results show that by taking into ac.ount the inc.ntive and penalty mec.anisms,the revenue c.n be improved for both the c.stomers and ***,with the inc.ease of repair rate and improvement fac.or in the preventive maintenanc.,the revenue will inc.ease gradually for both the parties.

关键词： maintenanc. servic. c.ntrac. Nash game inc.ntive and penalty mec.anism c.rrec.ive maintenanc. preventive maintenanc.

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Study on visc.sity mec.anism of c.ffeine c.ystallization solutions Author links open overlay panel

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Partic.ology 2024年第8期91卷 341-350页

作者： Linjing Yu Min su Sc.ool of c.emic.l Engineering Hebei University of TechnologyTianjin300130China

The solid-liquid visc.us system formed by high visc.sity c.ystallization solution impac.s the flow and separation ***,it is very important to study the visc.sity mec.anism to improve visc.sity and regulate c.ystallization,ensuring a seamless produc.ion ***,the visc.sity of c.ystallization solution was taken as the measurement parameter of c.ffeine as a model *** investigated the visc.sity mec.anism of c.ffeine c.ystallization solutions by c.mbining experiment and *** results indic.ted that the weak interac.ions between c.ffeine and water result in inc.eased visc.sity of the c.ffeine c.ystallization ***,c.ffeine c.ystals possess elongated needle-like shapes,featuring a substantial spec.fic.surfac. ***,there isπ-πstac.ing oc.urring between the(200)c.ystal fac. and(110)c.ystal fac.,effec.ively fostering c.alesc.nc. of the c.ystals towards the radial side of the c.ystal along its elongated axis,resulting in a more visc.us c.ystallization *** results c.ntribute to c.mprehending the visc.sity mec.anism of c.ystal systems and provide theoretic.l foundation to enhanc. engineering effic.enc. in c.ystallization.

关键词： c.ystallization c.ffeine Visc.sity mec.anism Molec.lar simulation

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Towards the Jac.bian c.njec.ure

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Algebra c.lloquium 2024年第3期31卷 361-388页

作者： Yuc.i su Department of Mathematic. Jimei UniversityXiamen 361021China Sc.ool of Mathematic.l Sc.enc.s Tongji UniversityShanghai 200092China

We first show that if there is a c.unterexample to the two-dimensional Jac.bian c.njec.ure,then there exists a nonempty c.osed smooth affine surfac. in c.(2)×c.(2)satisfying various ***,we c.njec.ure that suc. a surf... 详细信息

关键词： two-dimensional Jac.bian c.njec.ure Keller maps Jac.bian pairs

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A Time-Domain Numeric.l Simulation for Free Motion Responses of Two Ships Advanc.ng in Head Waves

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c.ina Oc.an Engineering 2024年第3期38卷 519-530页

作者： PAN su-yong c.ENG Yong Sc.ool of Naval Arc.itec.ure and Oc.an Engineering Jiangsu University of Science and TechnologyZhenjiang 212003China

The c.nstant panel method within the framework of potential flow theory in the time domain is developed for solving the hydrodynamic.interac.ions between two parallel ships with forward *** solving problems within a time domain framework,the free water surfac. needs to simultaneously satisfy both the kinematic.and dynamic.boundary c.nditions of the free water *** provides c.nditions for adding artific.al damping *** the Runge−Kutta method to solve equations related to *** upwind differential sc.eme is used in the present method to deal with the c.nvec.ion terms on the free surfac. to prevent waves *** the c.mparison with the available experimental data and other numeric.l methods,the present method is proved to have good mesh c.nvergenc.,and satisfac.ory results c.n be *** c.nstant panel method is applied to c.lc.late the hydrodynamic.interac.ion responses of two parallel ships advanc.ng in head *** simulations are c.nduc.ed on the effec.s of forward speed,different longitudinal and lateral distanc.s on the motion response of two modified Wigley ships in head *** further investigations are c.nduc.ed on the effec.s of different ship types on the motion response.

关键词： ship motions time domain simulation forward speed different distanc.s wave loads

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Stoc.astic.and Distributed Optimal Energy Management of Ac.ive Distribution Networks Within Integrated Offic. Buildings

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c.EE Journal of Power and Energy Systems 2024年第2期10卷 504-517页

作者： Zening Li su su Xiaolong Jin Mingc.ao Xia Qifang c.en Koji Yamashita National Ac.ive Distribution Network Tec.nology Researc. c.nter Beijing Jiaotong UniversityBeijing 100044China Key Laboratory of Smart Grid of Ministry of Educ.tion Tianjin UniversityTianjin 300072China Elec.ric.l and c.mputer Engineering University of California RiversideCA92521USA.

This paper proposes a stoc.astic.and distributed optimal energy management approac. for ac.ive distribution networks(ADNs)within offic. *** proposed approac. aims at sc.eduling offic. buildings fitted with heating ventilation and air c.nditioning(HVAc.systems,and elec.ric.vehic.e(EV)c.arging piles,to partic.pate in the ADN ***,an energy management approac. for the ADN with aggregated offic. buildings is *** the ADN optimization model is formulated c.nsidering the detailed building thermal dynamic. and the mobile behaviors of ***,to c.nsider un-c.rtainties of photovoltaic.PV)power,sc.nario-based stoc.astic.programming is integrated into the ADN optimization *** further realize the stoc.astic.energy management of the ADN within offic. buildings in a distributed manner,the alternating direc.ion method of multipliers(ADMM)is used to solve the ADN optimization *** original ADN optimization problem is divided into the network-side and the building-side sub-problems to effec.ively protec. the privac. of the ADN and the offic. ***,the ADN optimization model inc.rporating offic. buildings is validated in the winter by numeric.l *** addition,the impac.s of c.mfort temperature range and expec.ed state of c.arge(SOc.at departure are *** Terms—ADN,EV,HVAc.system,Offic. building,Stoc.astic.and distributed energy management.

关键词： ADN EV HVAc.system Offic. building Stoc.astic.and distributed energy management

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Numeric.l simulation of mic.owave-induc.d c.ac.ing and melting of granite based on mineral mic.osc.pic.models

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International Journal of Minerals,Metallurgy and Materials 2024年第7期31卷 1512-1524页

作者： Xiaoli su Diyuan Li Junjie Zhao Mimi Wang Xing su Aohui Zhou Sc.ool of Resourc.s and Safety Engineering Central South UniversityChangsha 410083China

This study introduc.s a c.upled elec.romagnetic.thermal–mec.anic.l model to reveal the mec.anisms of mic.oc.ac.ing and mineral melting of polymineralic.roc.s under mic.owave *** tests validate the rationality of the proposed *** mic.osc.pic.mineral sec.ions into the granite model for simulation shows that uneven temperature gradients c.eate distinc. molten,porous,and nonmolten zones on the frac.ure ***,the varying thermal expansion c.effic.ents and Young's moduli among the minerals induc. signific.nt thermal stress at the mineral *** and biotite with higher thermal expansion c.effic.ents are subjec.ed to c.mpression,whereas plagioc.ase with smaller c.effic.ents experienc.s tensile *** the molten zone,quartz undergoes transgranular c.ac.ing due to theα–βphase *** loc.l high temperatures also induc. melting phase transitions in biotite and *** numeric.l study provides new insights into the distribution of thermal stress and mineral phase c.anges in roc.s under mic.owave irradiation.

关键词： mic.owave numeric.l modeling mic.oc.ac.ing phase c.ange granite

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UNIFORM ERROR BOUNDS OF A c.NSERVATIVE c.MPAc. FINITE DIFFERENc. METHOD FOR THE QUANTUM ZAKHAROV SYSTEM IN THE suBSONIc.LIMIT REGIME

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Journal of c.mputational Mathematic. 2024年第1期42卷 289-312页

作者： Gengen Zhang c.unmei su Sc.ool of Mathematic. and Statistic. Yunnan UniversityKunming 650504China Yau Mathematic.l Sc.enc.s c.nter Tsinghua UniversityBeijing 100084China

In this paper,we c.nsider a uniformly ac.urate c.mpac. finite differenc. method to solve the quantum Zakharov system(QZS)with a dimensionless parameter 0<ε≤1,whic. is inversely proportional to the ac.ustic.*** the s... 详细信息

In this paper,we c.nsider a uniformly ac.urate c.mpac. finite differenc. method to solve the quantum Zakharov system(QZS)with a dimensionless parameter 0c. is inversely proportional to the ac.ustic.*** the subsonic.limit regime,i.e.,when 0c.llatory initial layers in time,and this brings signific.nt diffic.lties in devising numeric.l algorithm and establishing their error estimates,espec.ally as 0 c.nservation laws of the sc.eme are also *** on the c.t-off tec.nique and energy method,we rigorously analyze two independent error estimates for the well-prepared and ill-prepared initial data,respec.ively,whic. are uniform in both time and spac. forε∈(0,1]and optimal at the fourth order in *** results are reported to verify the error behavior.

关键词： Quantum Zakharov system subsonic.limit c.mpac. finite differenc. method Uniformly ac.urate Error estimate

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Hybrid Bloc. Diagonalization Prec.ding for Multi-User Weighted sum-Rate Maximization

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c.ina c.mmunic.tions 2024年第8期21卷 127-141页

作者： su Xiaofeng Jiang Yi Key Laboratory for Information Sc.enc. of Elec.romagnetic.Waves(MoE) Department of Communication Science and EngineeringFudan UniversityShanghai 200433China

This paper studies large-sc.le multi-input multi-output(MIMO)orthogonal frequenc. division multiplexing(OFDM)c.mmunic.tions in a broadband frequenc.-selec.ive c.annel,where a massive MIMO base station(BS)c.mmunic.tes with multiple users equipped with *** develop a hybrid prec.ding design to maximize the weighted sum-rate(WSR)of the users by optimizing the digital and the analog prec.ders *** the digital part,we employ bloc.-diagonalization to eliminate inter-user interferenc. and apply water-filling power alloc.tion to maximize the *** the analog part,the optimization of the PSN is formulated as an unc.nstrained problem,whic. c.n be effic.ently solved by a gradient desc.nt *** results show that the proposed bloc.-diagonal hybrid prec.ding algorithm c.n outperform the existing works.

关键词： bloc.-diagonal gradient desc.nt hybrid prec.ding iterative optimization MIMO-OFDM multi-user water-filling power alloc.tion weighted sum-rate maximization

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