检索结果-南通市图书馆

Short-Term Wind Power Prediction Based on WVMD and Spatio-Temporal Dual-Stream Network

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2024年第10期81卷 549-566页

作者： Yingnan Zhao Yuyuan ruan Zhen Peng School of Computer and Science Nanjing University of Information Science and TechnologyNanjing210044China

As the penetration ratio of wind power in active distribution networks continues to increase,the system exhibits some characteristics such as randomness and *** and accurate short-term wind power prediction is essential for algorithms like scheduling and optimization *** on the spatio-temporal features of Numerical Weather Prediction(NWP)data,it proposes the WVMD_DSN(Whale Optimization Algorithm,Variational Mode Decomposition,Dual Stream Network)*** model first applies Pearson correlation coefficient(PCC)to choose some NWP features with strong correlation to wind power to form the feature ***,it decomposes the feature set using Variational Mode Decomposition(VMD)to eliminate the nonstationarity and obtains Intrinsic Mode Functions(IMFs).Here Whale Optimization Algorithm(WOA)is applied to optimise the key parameters of VMD,namely the number of mode components K and penalty factor ***,incorporating attention mechanism(AM),Squeeze-Excitation Network(SENet),and Bidirectional Gated Recurrent Unit(BiGRU),it constructs the dual-stream network(DSN)for short-term wind power *** experiments demonstrate that the WVMD_DSN model outperforms existing baseline algorithms and exhibits good generalization *** relevant code is available at https://***/ruanyuyuan/***(accessed on 20 August 2024).

关键词： Wind power prediction dual-stream network variational mode decomposition(VMD) whale optimization algorithm(WOA)

A Maple Package on Symbolic Computation of Hirota Bilinear Form for Nonlinear Equations

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2009年第11期52卷 801-807页

作者： YANG Xu-Dong ruan Hang-Yu Department of Physics Ningbo University Ningbo 315211 China

An improved algorithm for symbolic computation of Hirota bilinear forms of KdV-type equations withlogarithmic transformations is *** the algorithm,the general assumption of Hirota bilinear form is successfullyreduced based on the property of uniformity in ***,we discard the integral operation in the *** software package HBFTrans is written in Maple and its running effectiveness is tested by a variety solitonequations.

关键词： Hirota bilinear form nonlinear equation, symbolic algebra

Non-isolated high step-up DC–DC converter adopting auxiliary capacitor and coupled inductor

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2018年第2期6卷 384-398页

作者： Gang WU Xinbo ruan Zhihong YE College of Automation Engineering Nanjing University of Aeronautics and Astronautics Power SBG ATD-NJ R&D Center Lite-On Technology Corp

For grid-connected power system based on photovoltaic(PV) source and fuel cells, high step-up and high-efficiency DC–DC converters are needed, due to the bus voltage of the grid-connected inverter is much higher than the output voltage of PV and fuel cells. In this paper, a novel high step-up converter is proposed. An auxiliary capacitor is introduced into the boost converter, which serves as a voltage source. It is in series with the input voltage source with the same voltage polarities. Thus, the input voltage is increased equivalently and the voltage gain is increased accordingly. To reduce the voltage stresses of the switch and the diode, multiple output capacitors are introduced. The voltage of each output capacitor is degraded leading to the reduced voltage stress. To replenish energy for the multiple output capacitors, a coupled inductor is adopted. Based on this, high step-up converter adopting auxiliary capacitor and coupled inductor is derived. The operating principles and voltage gain of the proposed converters are analyzed in this paper. In theend, experiment results are given to verify the theoretical analysis.

关键词： High voltage gain High efficiency Nonisolated Photovoltaic(PV) Fuel cell

Existence, uniqueness and stability of pyramidal traveling fronts in reaction-diffusion systems

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2016年第10期59卷 1869-1908页

作者： WANG ZhiCheng LI WanTong ruan ShiGui School of Mathematics and Statistics Lanzhou University Department of Mathematics University of Miami

In the one-dimensional space, traveling wave solutions of parabolic differential equations have been widely studied and well characterized. Recently, the mathematical study on higher-dimensional traveling fronts has attracted a lot of attention and many new types of nonplanar traveling waves have been observed for scalar reaction-diffusion equations with various nonlinearities. In this paper, by using the comparison argument and constructing appropriate super- and subsolutions, we study the existence, uniqueness and stability of three- dimensional traveling fronts of pyramidal shape for monotone bistable systems of reaction-diffusion equations in R3. The pyramidal traveling fronts are characterized as either a combination of planar traveling fronts on the lateral surfaces or a combination of two-dimensional V-form waves on the edges of the pyramid. In particular, our results are applicable to some important models in biology, such as Lotk,u-Volterra competition-diffusion systems with or without spatio-temporal delays, and reaction-diffusion systems of multiple obligate mutualists.

关键词： reaction-diffusion systems bistability pyramidal traveling fronts existence uniqueness stability

Interaction Between Line Soliton and Algebraic Soliton for Asymmetric Nizhnik-Novikov-Veselov Equation

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2008年第6期49卷 1547-1552页

作者： ruan Hang-Yu LI Zhi-Fang Department of Physics Ningbo University Ningbo 315211 China Nonlinear Science Center and Physics Department Ningbo University Ningbo 315211 China State Key Laboratory of Scientific and Engineering Computing Institute of Computational Mathematics and Scientific Engineering Computing Academy of Mathematics and System Sciences the Chinese Academy of Sciences P.O. Box 2719 Beijing 100080 China

Starting from the variable separation approach, the algebraic soliton solution and the solution describing the interaction between line soliton and algebraic soliton are obtained by selecting appropriate seed solution for （2＋1）-dimensional ANNV equation. The behaviors of interactions are discussed in detail both analytically and graphically. It is shown that there are two kinds of singular interactions between line soliton and algebraic soliton： 1） the resonant interaction where the algebraic soliton propagates together with the line soliton and persists infinitely; 2） the extremely repulsive interaction where the algebraic soliton affects the motion of the line soliton infinitely apart.

关键词： variable separation approach the interaction between line soliton and algebraic soliton (2+1)-dimensional ANNV equation

MECHANISM RESEARCH FOR 3D NON-AXISYMMETRIC THIN-WALL TUBE OFFSET SPINNING

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Mechanical Engineering 2006年第2期19卷 217-222页

作者： KUANG Weihua XIA Qinxiang ruan Feng　 Faculty of Material and Energy Guangdong University of TechnologyGuangzhou 510006 China College of Mechanical Engineering South China University of TechnologyGuangzhou 510640 China

Difference of offset spinning with conventional symmetric spinning is analyzed. A 3D FEM model for offset tube neck-spinning is established and the spinning process is simulated by means of ANSYS software. Dynamic boundary and contact problems in simulation are solved. Transient stress distribution of contact area, transient strain distribution of nodes in typical section and strain distribution of the workpiece at last are attained, the place and the cause of crack are analyzed. Strain variation curves with time of offset spinning and conventional spinning are compared. It shows the mechanism difference between offset spinning and conventional spinning. In addition, simulation results show how strain distribution of typical section, thickness of some typical nodes, axial extension in left section and force of three rollers change with time. According to the study of the variation curve, material flow law along radial, tangential and axial direction is attained and the whole spinning process is studied. The simulation results discover that offset distance is the key to manufacture offset non-symmetric tube, and process parameters change with spinning angle. Experiment data really reflect different process parameters＇ influence on conventional symmetric and offset spinning force. Experiments accord well with simulation.

关键词： Offset Symmetric Neck-spinning Simulation Mechanism

A Precise Information Extraction Algorithm for Lane Lines

在线全文

学校读者我要写书评

暂无评论

China Communications 2018年第10期15卷 210-219页

作者： Jinyan Chen Yaduan ruan Qimei Chen School of Electronic Science and Engineering Nanjing University

Lane line detection is a fundamental step in applications like autonomous driving and intelligent traffic monitoring. Emerging applications today have higher requirements for accurate lane detection. In this paper, we present a precise information extraction algorithm for lane lines. Specifically, with Gaussian Mixture Model(GMM), we solved the issue of lane line occlusion in multi-lane scenes. Then, Progressive Probabilistic Hough Transform(PPHT) was used for line segments detection. After K-Means clustering for line segments classification, we solved the problem of extracting precise information that includes left and right edges as well as endpoints of each lane line based on geometric characteristics. Finally, we fitted these solid and dashed lane lines respectively. Experimental results indicate that the proposed method performs better than the other methods in both single-lane and multi-lane scenarios.

关键词： multi-lane scenes lane line occlusion left and right edges endpoints of lane lines

Uniform perfectness of the attractor of bi-Lipschitz IFS

在线全文

学校读者我要写书评

暂无评论

Science China Mathematics 2006年第4期49卷 433-438页

作者： ruan Huojun SUN Yeshun YIN Yongcheng Department of Mathematics Zhejiang University Hangzhou 310027 China Department of Mathematics Zhejiang University Hangzhou 310027 China Department of Mathematics Zhejiang University Hangzhou 310027 China

In this paper, we prove that the attractor of C1,a bi-Lipschitz IFS in R is uniformly perfect if it is not a singleton. Then we construct an example to show that this does not hold for C1 bi-Lipschitz IFS in Rn.

关键词： uniform perfectness, iterated function systems.

GAEP:a comprehensive genome assembly evaluating pipeline

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2023年第10期50卷 747-754页

作者： Yong Zhang Hong-Wei Lu Jue ruan Shenzhen Branch Guangdong Laboratory of Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhenGuangdong 518120China State Key Laboratory of Rice Biology and Breeding China National Rice Research InstituteChinese Academy of Agricultural SciencesHangzhouZhejiang 311401China

With the rapid development of sequencing technologies,especially the maturity of third-generation sequencing technologies,there has been a significant increase in the number and quality of published genome *** emergence of these high-quality genomes has raised higher requirements for genome *** numerous computational methods have been developed to evaluate assembly quality from various perspectives,the selective use of these evaluation methods can be arbitrary and inconvenient for fairly comparing the assembly *** address this issue,we have developed the Genome Assembly Evaluating Pipeline(GAEP),which provides a comprehensive assessment pipeline for evaluating genome quality from multiple perspectives,including continuity,completeness,and ***,GAEP includes new functions for detecting misassemblies and evaluating the assembly redundancy,which performs well in our *** is publicly available at https://***/zyoptimistic/GAEP under the GPL3.0 *** GAEP,users can quickly obtain accurate and reliable evaluation results,facilitating the comparison and selection of high-quality genome assemblies.

关键词： Genome assembly Assembly quality Assembly metrics Assembly evaluation pipeline Misassembly detection Misassembly breakpoint Assembly redundancy