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A Time Series Short-Term Prediction Method Based on Multi-Granularity Event Matching and alignment

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Computers, Materials & Continua 2024年第1期78卷 653-676页

作者： Haibo Li Yongbo Yu Zhenbo Zhao Xiaokang Tang College of Computer Science and Technology Huaqiao UniversityXiamen361021China

Accurate forecasting of time series is crucial across various domains.Many prediction tasks rely on effectively segmenting,matching,and time series data alignment.For instance,regardless of time series with the same granularity,segmenting them into different granularity events can effectively mitigate the impact of varying time scales on prediction accuracy.However,these events of varying granularity frequently intersect with each other,which may possess unequal durations.Even minor differences can result in significant errors when matching time series with future trends.Besides,directly using matched events but unaligned events as state vectors in machine learning-based prediction models can lead to insufficient prediction accuracy.Therefore,this paper proposes a short-term forecasting method for time series based on a multi-granularity event,MGE-SP(multi-granularity event-based short-termprediction).First,amethodological framework for MGE-SP established guides the implementation steps.The framework consists of three key steps,including multi-granularity event matching based on the LTF(latest time first)strategy,multi-granularity event alignment using a piecewise aggregate approximation based on the compression ratio,and a short-term prediction model based on XGBoost.The data from a nationwide online car-hailing service in China ensures the method’s reliability.The average RMSE(root mean square error)and MAE(mean absolute error)of the proposed method are 3.204 and 2.360,lower than the respective values of 4.056 and 3.101 obtained using theARIMA(autoregressive integratedmoving average)method,as well as the values of 4.278 and 2.994 obtained using k-means-SVR(support vector regression)method.The other experiment is conducted on stock data froma public data set.The proposed method achieved an average RMSE and MAE of 0.836 and 0.696,lower than the respective values of 1.019 and 0.844 obtained using the ARIMA method,as well as the values of 1.350 and 1.172 obtained using the k-means-SVR method.

关键词： Time series short-term prediction multi-granularity event alignment event matching

alignment of human KAT2A(GCN5)histone acetyltransferase and SARS-CoV-2 Orf8 viral proteins

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慢性疾病与转化医学:英文版 2023年第3期9卷 263-265页

作者： Steven Lehrer Peter H.Rheinstein Division of Pharmacology Fermata PharmaInc.New YorkUSA Division of Pharmacology Severn Health SolutionsSeverna ParkMarylandUSA

The coronavirus SARS-CoV-2 has already claimed the lives of more than six million people,according to the World Health Organization,and the actual death toll may exceed 18 million.People are avoiding severe cases of COvID-19 thanks to vaccines,medications,and immunity from prior infections.Yet the virus's capacity to block the body's immune response,made possible by its arsenal of proteins,is one factor in its propensity to spread.

关键词： alignment protein virus

Superlubricity by polyimide-induced alignment

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Friction 2023年第9期11卷 1690-1707页

作者： Xinlei GAO Hao CHEN Hong YAN Chengrui HUANG Li WU Tingting WANG School of Materials Science and Engineering Hubei UniversityWuhan 430062China School of Chemical and Environmental Engineering Wuhan Polytechnic UniversityWuhan 430023China State Key Laboratory of Chemical Resource Engineering College of ChemistryBeijing University of Chemical TechnologyBeijing 100029China School of Chemistry and Environmental Engineering Wuhan Institute of TechnologyWuhan 430074China

We have investigated the lubrication alignment behavior of point–plane contact and plane–plane contact between the GCr15 steel and polyimide(PI)friction pair using nematic liquid crystals(LCs)as the lubricant.In this system,rubbing orients the macromolecular PI molecules,and the oriented PI molecules induce alignment of the LC molecules in contact with or close to the oriented PI molecules.The LC molecules are aligned in the wear scar grooves of the PI film,and alignment extends to the GCr15-steel counterpart.alignment of the LC molecules is correlated with the strong interaction force between the PI and LC molecules,the stable coordination structure of the LCs and GCr15 steel,and the weak interaction between the LC molecules.We performed simulations of the pretilt angle of PI and LCs and discussed the relationship between the pretilt angle and the friction properties.Owing to the small pretilt angle between PI and the LCs,the LC molecules orient almost parallel to the PI material,which is beneficial for superlubricity of this type of friction system.

关键词： superlubricity polyimide liquid crystal alignment

Curvature-controlled band alignment transition in 1D van der Waals heterostructures

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npj Computational Materials 2023年第1期9卷 1411-1419页

作者： Shu Zhao Chunxia Yang Ziye Zhu Xiaoping Yao Wenbin Li School of Materials Science and Engineering Zhejiang University310027 HangzhouChina Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province School of EngineeringWestlake University310030 HangzhouChina Institute of Advanced Technology Westlake Institute for Advanced Study310024 HangzhouChina

The effect of curvature on the band alignment of one-dimensional (1D) van der Waals (vdW) transition metal dichalcogenide(TMDC) heterostructures is studied by comprehensive first-principles calculations. We find that, as the diameter of a TMDCnanotube decreases, the combined effect of curvature-induced flexoelectricity and circumferential tensile strain causes a rapidlowering of the conduction band minimum, whereas the valence band maximum exhibits an initial lowering before rising. Asindividual TMDC nanotubes form coaxial heterostructures, the concerted effect of diameter-dependent band-edge levels andintertube coupling via flexovoltage can result in a transition of intertube band alignment from Type II to Type I in multipleheterostructural systems, including large-diameter MoSe_(2)@WS_(2), MoTe_(2)@MoSe_(2), and MoTe_(2)@WS_(2) heterostructures. These results laydown a foundation for the rational design of 1D vdW heterostructures.

关键词： alignment curvature band

Effects of CuInS_(2)nanoparticles on the alignment control of liquid crystals

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Nano Research 2022年第8期15卷 7542-7548页

作者： Dongyu Zhao Yuanyuan Guo Weihua Bi Xin Li Ran Duan Lin Guo Beijing Advanced Innovation Center for Biomedical Engineering School of ChemistryBeihang UniversityBeijing 100191China

Liquid crystal-nanoparticle composite systems have attracted particular attention for both academic interests and applications in inducing macroscopic alignment,altering electro-optic response of the liquid crystal hosts,and generating ordered,tunable soft metamaterials.Herein,the synthesis of two shapes of CuInS_(2)nanoparticles,tremelliform-like CuInS_(2)and frame-like CuInS_(2),and their utilization in producing uniform homeotropic alignment of liquid crystals are reported.Through exploring the mechanism in detail,the crystal structures of CuInS_(2)nanoparticles were found to rely heavily on the reaction solvents during the growth process,which in turn play a significant role on the anchor of liquid crystal molecules.The achieved homeotropic alignment shows high thermal stability,owing to the outstanding stability of the CuInS_(2)nanoparticles.In addition,combining this feasible method with parallel-aligning technique,variable pretilt angles in a range of~0.9°to~7.2°could be continuously achieved.

关键词： CuInS_(2)nanoparticles morphology liquid crystals alignment pretilt angle

Multi-domain abdomen image alignment based on multi-scale diffeomorphic jointed network

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Optoelectronics Letters 2022年第10期18卷 628-634页

作者： LU Zhengwei WANG Yong GUAN Qiu CHEN Yizhou LIU Dongchun XU Xinli College of Computer Science and Technology Zhejiang University of TechnologyHangzhou310014China

Recently, the generative adversarial network(GAN) has been extensively applied to the cross-modality conversion of medical images and has shown outstanding performance than other image conversion algorithms. Hence, we propose a novel GAN-based multi-domain registration method named multiscale diffeomorphic jointed network of registration and synthesis(MDJRS-Net). The deviation of the generator of the GAN-based approach affects the alignment phase, so a joint training strategy is introduced to improve the performance of the generator, which feedbacks the structural loss contained in the deformation field. Meanwhile, the nature of diffeomorphism can enable the network to generate deformation fields with more anatomical properties. The average dice score(Dice) is improved by 1.95% for the computer tomography venous(CTV) to magnetic resonance imaging(MRI) registration task and by 1.92% for the CTV to computer tomography plain(CTP) task compared with the other methods.

关键词： network alignment image

1D alignment of proteins and other nanoparticles by using reversible covalent bonds on cyclic peptide nanotubes

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Organic Chemistry Frontiers 2022年第5期9卷 1226-1233页

作者： Juan M.Priegue Iria Louzao Ivan Gallego Javier Montenegro Juan R.Granja Singular Research Centre in Chemical Biology and Molecular Materials (CIQUS)Organic Chemistry DepartmentUniversity of Santiago de Compostela(USC)15782 Santiago de CompostelaSpain

Self-assembling cyclic peptide nanotubes are supramolecular structures whose diameter and external surface properties are precisely controlled.In this communication we describe a general strategy to align different mo... 详细信息

关键词： nanoparticles alignment surface

alignment of human aquaporin 4 andß-amyloid proteins may indicate involvement ofß-amyloid in brain water homeostasis and prevention of brain edema

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Chronic Diseases and Translational Medicine 2023年第2期9卷 177-181页

作者： Steven Lehrer Peter H.Rheinstein Fermata Pharma Inc.New YorkNew YorkUSA Severn Health Solutions Severna ParkMarylandUSA

The amyloid hypothesis states that the buildup ofßamyloid in the brain is the main factor for Alzheimer's disease(AD)pathogenesis.An imbalance betweenßamyloid production andß-amyloid clearance causes the advanced stag... 详细信息

关键词： alignment brain edema protein

Vector meson spin alignment by the strong force field

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Nuclear Science and Techniques 2023年第1期34卷 172-174页

作者： Xin‑Nian Wang Lawrence Berkeley National Laboratory Nuclear Science Division MS 70R0319BerkeleyCalifornia 94720USA Physics Department University of CaliforniaBerkeleyCalifornia 94720USA

Observation of unexpectedly large global spin alignment of φ vector mesons in non-central heavy-ion collisions by STAR experiment may reveal the non-perturbative nature of quark interaction in hot matter through fluc... 详细信息

关键词： meson alignment field