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Prediction and analysis of chaotic time series on the basis of support vector

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Journal of Systems Engineering and Electronics 2008年第4期19卷 806-811页

作者： li Tianliang He liming li haipeng The Engineering Inst. Air Force Engineering Univ. Xi'an 710038 P. R. China

Based on discussion on the theories of support vector machines （SVM）, an one-step prediction model for time series prediction is presented, wherein the chaos theory is incorporated. Chaotic character of the time series is taken into account in the prediction procedure; parameters of reconstruction-detay and embedding-dimension for phase-space reconstruction are calculated in light of mutual-information and false-nearest-neighbor method, respectively. Precision and functionality have been demonstrated by the experimental results on the basis of the prediction of Lorenz chaotic time series.

关键词： support vector machines chaotic time series prediction model functionality

Optimization method of linear barrier coverage deployment for multistatic radar

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Journal of Systems Engineering and Electronics 2023年第1期34卷 68-80页

作者： li haipeng FENG Dazheng WANG Xiaohui National Lab of Radar Signal Processing Xidian UniversityXi’an 710071China The 1st General Department Xi’an Electronic Engineering Research InstituteXi’an 710100China

To address the problem of building linear barrier coverage with the location restriction, an optimization method for deploying multistatic radars is proposed, where the location restriction splits the deployment line into two segments. By proving the characteristics of deployment patterns, an optimal deployment sequence consisting of multiple deployment patterns is proposed and exploited to cover each segment. The types and numbers of deployment patterns are determined by an algorithm that combines the integer linear programming(ILP)and exhaustive method(EM). In addition, to reduce the computation amount, a formula is introduced to calculate the upper threshold of receivers’ number in a deployment pattern. Furthermore, since the objective function is non-convex and non-analytic, the overall model is divided into two layers concerning two suboptimization problems. Subsequently, another algorithm that integrates the segments and layers is proposed to determine the deployment parameters, such as the minimum cost, parameters of the optimal deployment sequence, and the location of the split point. Simulation results demonstrate that the proposed method can effectively determine the optimal deployment parameters under the location restriction.

关键词： multistatic radar linear barrier coverage minimum deployment cost deployment sequence wireless sensor networks(WSNs)

Theoretical and simulation studies on voltage-gated sodium channels

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Protein & Cell 2015年第6期6卷 413-422页

作者： Yang li haipeng Gong MOE Key Laboratory of Bioinformatics School of Life Sciences Tsinghua University Beijing 100084 China

Voltage-gated sodium （Nav） channels are indispensable membrane elements for the generation and propagation of electric signals in excitable cells. The successes in the crystallographic studies on prokaryotic Nay chan- nels in recent years greatly promote the mechanistic investigation of these proteins and their eukaryotic counterparts. In this paper, we mainly review the pro- gress in computational studies, especially the simula- tion studies, on these proteins in the past years.

关键词： voltage-gated sodium channels,molecular dynamics simulation ion permeation ionselectivity voltage gating

Energy consumption optimization-based joint route selection and flow allocation algorithm for software-defined networking

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Science China(Information Sciences) 2017年第4期60卷 71-84页

作者： Rong CHAI haipeng li Feiying MENG Qianbin CHEN Key Laboratory of Mobile Communication Technologies Chongqing University of Posts and Telecommunications

Software-defined networking(SDN) is expected to dramatically simplify network control processes,enable the convenient deployment of sophisticated networking functions, and support user applications with guaranteed quality of service(Qo S). To achieve data packet transmission between two non-adjacent switches in SDN, an efficient route selection algorithm should be designed. In this paper, we consider the data transmission of multiple user flows over SDN. Under the assumption that flow splits at intermediate switches are allowed,we jointly study the route selection and flow allocation problem. To stress the problem of resource competition among various user flows, we apply network virtualization technology and propose a virtual network architecture based on the design of an optimal joint route selection and flow allocation algorithm. Jointly considering the transmission performance of multiple user flows and stressing the importance of energy consumption at transmission links and switches, we formulate the total energy consumption of user flows and design an optimization problem that minimizes the energy consumption, subject to data transmission and service requirement constraints of the flows. Because the formulated optimization problem is an NP-complete problem that cannot be conveniently solved, we transform it into a minimum-cost commodity flow problem and solve the problem by using an N-algorithm. Numerical results demonstrate the effectiveness of the proposed algorithm.

关键词： software-defined networking virtualization route selection flow allocation energy consumption

Numerical Simulation of Microstructure Formation and Forecast of Mechanical Properties for Spheroidal Graphite Iron

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Journal of Materials Science & Technology 2003年第z1期19卷 13-16页

作者： Weimin ZHAO Shuping HOU haipeng li Aiwen HU School of Materials Science and Engineering Hebei University of TechnologyTianjin 300132 China Tianjin Commercial University 300400 China School of Materials Science and Engineering Hebei University of TechnologyTianjin 300132 China School of Materials Science and Engineering Hebei University of TechnologyTianjin 300132 China

The numerical simulation can overcome the hardship of mathematical analysis and experimental research, explicate the mechanism of microstructure shaping, predict mechanical properties and operating life of castings and then optimize technology and control microstructure formation to obtain the qualified castings. The finite difference method (FDM) is applied to the simulation of temperature field based on all kinds of nucleation and growth models on all stages of solidification of spheroidal graphite cast iron. Visual C++ is used to program the numerical simulation software, QTstructure-1 to simulate the solidification process of spheroidal graphite cast iron and the formation of all phases in solidification process. Finally, the result of simulation is well agreed with the experimental result.

关键词： Spheroidal graphite iron, Numerical simulation, Finite difference method, Temperature field

Wheat morphological and biochemical responses to copper oxide nanoparticles in two soils

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Pedosphere 2024年第4期34卷 814-825页

作者： Qian YANG haipeng li Yuqing ZHANG Yinghao liU Helian li School of Water Conservancy and Environment University of JinanJinan 250022China

The widespread application of copper oxide nanoparticles(CuO NPs)in agricultural production has caused growing concerns about their impact on *** this study,wheat root elongation was used to evaluate the toxic effect concentrations of CuO NPs in two soils with differing properties,collected from farmlands in Guangdong(GD)and Shandong(SD)provinces,*** morphological and biochemical properties were also assessed to explore the toxicity mechanism of CuO NPs on wheat *** root elongation results revealed lower toxic effect concentration values in the plants grown in GD soil than in SD ***,the treatment with CuO NPs at 200 mg Cu kg^(-1) significantly reduced wheat root and shoot biomass by 35.8%and 15.8%,respectively,in GD *** microscopy showed that CuO NPs deformed wheat roots and entered leaf cells,causing deformation and damaging the cell *** CuO NP treatments also decreased chlorophyll content,increased antioxidant enzyme activity,and increased membrane lipid peroxidation in wheat *** addition of CuO NPs significantly reduced the Zn(by 17.3%)and Fe(by 26.9%)contents in the leaves of plants grown in GD and SD soils,***,the contents of Cu,Mg,and Mn were increased by 27.4%–52.5%in GD soil and by 17.9%–71.6%in SD *** results suggested that CuO NPs showed greater toxicity to wheat plants grown in acidic soil than in alkaline soil and that the adverse effects of CuO NP treatments on wheat seedlings were due to a combination of CuO NPs and released Cu^(2+).

关键词： antioxidant enzyme activity chlorophyll content CuO nanoparticles element accumulation membrane lipid peroxidation root elongation toxic effectconcentration

Effect of Initial Microstructure Prior to Extrusion on the Microstructure and Mechanical Properties of Extruded AZ80 Alloy with a Low Temperature and a Low Ratio

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Chinese Journal of Mechanical Engineering 2023年第3期36卷 339-349页

作者： Hang Zhang haipeng li Rongguang li Boshu liu Ruizhi Wu Dongyue Zhao Shanshan li School of Mechanical and Power Engineering Shenyang University of Chemical TechnologyShenyang 110142China Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin 150001China

Magnesium(Mg)alloys are the lightest metal structural material for engineering applications and therefore have a wide market of ***,compared to steel and aluminum alloys,Mg alloys have lower mechanical properties,which greatly limits their *** is one of the most important processing methods for Mg and its ***,the effect of such a heterogeneous microstructure achieved at low temperatures on the mechanical properties is lacking *** this work,commercial AZ80 alloys with different initial microstructures(as-cast and as-homogenized)were selected and extruded at a low extrusion temperature of 220℃and a low extrusion ratio of *** microstructure and mechanical properties of the two extruded AZ80 alloys were *** results show that homogenized-extruded(HE)sample exhibits higher strength than the cast-extruded(CE)sample,which is mainly attributed to the high number density of fine dynamic precipitates and the high fraction of recrystallized ultrafine *** to the coarse compounds existing in CE sample,the fine dynamical precipitates of Mg17(Al,Zn)12form in the HE sample can effectively promote the dynamical recrystallization during extrusion,while they exhibit a similar effect on the size and orientation of the recrystallized *** results can facilitate the designing of high-strength wrought magnesium alloys by rational microstructure construction.

关键词： Magnesium alloy Low temperature and low ratio extrusion Bimodal grain structure Dynamic precipitate Dynamic recrystallization

Synthesis of liquid-like Trisilanol Isobutyl-POSS NOHM and Its Application in Capturing CO2

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Chemical Research in Chinese Universities 2015年第3期31卷 484-488页

作者： BAI haipeng ZHENG Yaping li Peipei ZHANG Aibo School of Natural and Applied Science Northwestern Polytechnical University Xi&#39 an 710072 P.R.China

The trisilanol isobutyl polyhedral oligomeric silsesquioxane（POSS） was fabricated into liquid-like nano- particle organic hybrid materials（NOHMs） with ）,-（2,3-epoxypropoxy）propytrimethoxysilane as corona and polyethe- ramine M2070 as canopy, and the product was called liquid-like POSS NOHM. The liquid-like POSS NOHM has a low viscosity at room temperature without any solvent and the mass fraction of trisilanol isobutyl POSS was 23.38%. The liquid-like POSS NOHM shows great CO2 capturing property with a capacity of 2.108 mmol/g（PCO2=6 MPa）. The physical adsorption increased obviously with the pressure going up and it may make a difference between liquid-like POSS NOHMs and traditional monoethamolamine（MEA） based CO2 absorbent. The recycle property was also studied. The NOHM behaved as fresh product even after 10 cycles.

关键词： liquid-like nanoparticle organic hybrid material Polyhedral oligomeric silsesquioxane CO2 capture

Bio-Inspired Optimal Dispatching of Wind Power Consumption Considering Multi-Time Scale Demand Response and High-Energy Load Participation

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Computer Modeling in Engineering & Sciences 2023年第2期134卷 957-979页

作者： Peng Zhao Yongxin Zhang Qiaozhi Hua haipeng li Zheng Wen School of Information Technology Luoyang Normal UniversityLuoyang471022China Computer School Hubei University of Arts and ScienceXiangyang441000China Capinfo Company Ltd.Beijing100010China School of Fundamental Science and Engineering Waseda UniversityTokyo169-8050Japan

Bio-inspired computer modelling brings solutions fromthe living phenomena or biological systems to engineering *** overcome the obstruction problem of large-scale wind power consumption in Northwest China,this paper constructs a bio-inspired computer *** is an optimal wind power consumption dispatching model of multi-time scale demand response that takes into account the involved high-energy ***,the principle of wind power obstruction with the involvement of a high-energy load is examined in this *** this step,highenergy load model with different regulation characteristics is ***,considering the multi-time scale characteristics of high-energy load and other demand-side resources response speed,a multi-time scale model of coordination optimization is *** improved bio-inspired model incorporating particle swarm optimization is applied to minimize system operation and wind curtailment costs,as well as to find the most optimal energy configurationwithin the ***,we take an example of regional power grid in Gansu Province for simulation *** demonstrate that the suggested scheduling strategy can significantly enhance the wind power consumption level and minimize the system’s operational cost.

关键词： Biological system multi-time scale wind power consumption demand response bio-inspired computermodelling particle swarm optimization