检索结果-南通市图书馆

Improved EMD Based on piecewise Cubic Hermite Interpolation and Mirror Extension

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Electronics 2020年第5期29卷 899-905页

作者： ZHANG Xuejun huo Yan WAN Dongsheng College of Electronic and Optical Engineering Nanjing University of Posts and Telecommunications Nation-Local Joint project Engineering Laboratory of RF Integration and Micropackage

This paper proposes an improved Empirical mode decomposition(EMD) method piecewise cubic hermite interpolation and mirror extension. Firstly, mirror expansion method is used to expand preliminary signal endpoint; then the piecewise cubic Hermite interpolation algorithm is applied to obtain the envelopes. Finally Intrinsic mode functions(IMFs) are obtained through improved EMD(MpC-HEMD). Through the analysis on simulation signals and Electroencephalogram(EEG)signals, we found that the new method was better than the traditional method.

关键词： Common spatial pattern EEG signal Empirical mode decomposition Feature extraction Mirror expansion piecewise cubic Hermite interpolation

Dry port-Seaport Logistics Network Construction under the Belt and Road Initiative: A Case of Shandong province in China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2021年第2期30卷 178-197页

作者： Jingci Xie Yiran Sun Xin huo School of Management Shandong UniversityJi'nan 250100China CRRC Qingdao Sifang Co.Ltd Qingdao 266111China

In recent years,China's dry ports have entered into a period of rapid development,especially driven by the Belt and Road initiative(BRI).This initiative not only provides valuable opportunities,but also intensifies fierce competition between *** order to earn more profits and maintain an advantageous position,dry ports generally tend to rely on seaports to increase competitiveness and attract more goods,and seaports are also willing to cooperate with dry ports to expand their *** a large coastal province in China,Shandong province has good maritime *** of the fierce competition among seaports inside and outside Shandong province,port operators should make good use of the opportunity offered by BRI to make connections with the inland cities through the dry port-seaport logistics network and enhance the *** order to take an active part in the process of the BRI,forming a dry port-seaport logistics network is a win-win strategy for Shandong *** research first analyzes the impact of the Belt and Road initiative on ports of Shandong and its development,then uses complex network theory and TOpSIS method to select dry port candidate cities from BRI's important transportation *** considering economic benefits,carbon emissions and construction costs,a multi-objective optimization model is established with a construction cost preference *** the NSGA-II algorithm is used to solve the realistic *** study finds that when the construction cost increases,the transportation cost and carbon emission cost will decrease,which indicates that the dry port-seaport logistics network established under the BRI can reduce the cost of logistics transportation and environmental pollution.

关键词： Dry port Belt and Road Initiative logistics network mathematical programming

Assessment of two quasi-static approaches to mimic repeated impact response and damage behaviour of CFRp laminates

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

Chinese Journal of Aeronautics 2023年第8期36卷 101-114页

作者： Lubin huo Dries VERSTRAETEN René ALDERLIESTEN Structural Integrity&Composites Group Faculty of Aerospace EngineeringDelft University of TechnologyP.O.Box 50582600 GB Delftthe Netherlands

Full impact damage tolerance assessment requires the ability to properly mimic the repeated impact response and damage behaviour of composite materials using quasi-static *** this aim,this paper reports an experimental investigation evaluating two quasi-static methods for mimicking repeated impact response and damage behaviour of Carbon Fibre Reinforced polymer(CFRp)composite *** this study,an 8.45-J single impact was repeated 225 times and mimicked with 225 times 6.51-J quasi-static(energy equivalent)indentations and with 225 quasi-static(force equivalent)indentations following the recorded impact peak force *** show that the loading rate and the inertial effect are the two major factors affecting the responses of the composite laminates under out-of-plane concentrated *** the energyand force-equivalent quasi-static indentations failed to reproduce the impact responses greatly associated with high loading rate and inertial *** force-equivalent quasi-static indentations were performed in a semi-automatic way and induced damage states more similar to those of the repeated impacts than those of the energy-equivalent quasi-static indentations,whereas the latter can be better automated and has better reproducibility compared to that of the repeated impact responses,as it is less dependent on high loading rate and inertial effect.

关键词： Composite laminates Damage detection Damage characterization Low-velocityimpact Quasi-static indentation Thermoset composites

The impact of government incentives and penalties on willingness to recycle plastic waste: An evolutionary game theory perspective

在线全文

学校读者我要写书评

暂无评论

Frontiers of Environmental Science & Engineering 2020年第2期14卷 173-184页

作者： Zhen Wang Jiazhen huo Yongrui Duan School of Economics and Management Tongji UniversityShanghai 200092China Bosch-Tongji University Chair of Global Supply Chain Management Shanghai 200092China

Because governments have introduced policies involving incentives and penalties to promote the recycling of plastic waste,it is important to understand the impact of such incentives and penalties on the willingness of stakeholders to *** this study,government is included as a player,alongside waste collectors and recyclers,in a tripartite evolutionary game model of plastic waste *** study explores the evolutionary equilibrium and performs a simulation analysis to elucidate the effect of government incentives and penalties on the willingness of other players to participate in *** conclusions are drawn from this ***,an increase in incentives or in penalties increases the probability that collectors and recyclers will participate in the recycling ***,policy support incentives encourage collectors and recyclers to participate in plastic waste recycling earlier than subsidy incentives ***,recyclers are more sensitive than collectors to government-imposed penalties.

关键词： plastic waste Recycle Reuse Government incentives Government penalties Evolutionary game

Motion-pressure coupled control and simulation of long-endurance capability for multicapsule stratospheric airships

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

Chinese Journal of Aeronautics 2024年第6期37卷 137-150页

作者： Zhiguang SHI Wei huo Zongyu ZUO School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China Beijing Near Space Airship Technology Development Co. LtdBeijing 100070China

The current study focuses on the motion-pressure coupled control for a multicapsule stratospheric airship and transforms the path-tracking and heading-hold control of airships into guidance tracking with a time-varying weighted sum of longitudinal and lateral velocities by the definition of compound ***,an improved nonlinear predictive control method is provided to reduce the control energy consumption by the rolling optimization of controller parameters based on finite time intervals,ensuring infinite-time path-tracking ***,combined with the proposed cyclic regulation process of safe pressure between internal and external capsules,this study can fully reflect the force-thermal coupled rule of airships under the actions of atmospheric environment and maneuvering force,while evaluating the long-endurance capability of airships under the conditions of safe superheating and *** effectiveness of the motionpressure coupled controller was verified through numerical simulations,which can overcome the influence of environmental wind and achieve a tracking effect for the desired cruise path and compound *** airspeed provided during the cyclic circadian time caused the maximum superheating of the helium controlled within 30*** helium in the internal and external capsules achieved circadian *** equivalent micropore diameter of the capsule of 5 mm can achieve 55 days of long-endurance *** controller satisfies the requirements of cruise-flight application modes for multicapsule stratospheric airships with important engineering value.

关键词： Compound speed Nonlinear predictive control Cyclic pressure regulation Long-endurance capability Stratospheric airship

MRT-LBM-based numerical simulation of seepage flow through fractal fracture networks

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2013年第12期56卷 3115-3122页

作者： FAN huo ZHENG Hong State Key Laboratory of Geomechanics and Geotechnical Engineering Institute of Rock & Soil Mechanics Chinese Academy of Sciences Institute of Mountain Hazards and Environment Chinese Academy of Sciences University of Chinese Academy of Sciences

The study on seepage flow passing through single fractures is essential and critical for understanding of the law of seepage flow passing through fracture networks and the coupling mechanisms of seepage field and stress field in rock *** using the fractal interpolation to reconstruct a natural coarse fracture,as well as taking into account the microstructure of the fracture,the numerical simulation of seepage flow passing through the coarse fractures with two distinct vertical scaling factors is conducted based on the MRT-LBM model of the lattice Boltzmann ***,after obtaining the length of the preferential flow pathway,the permeability of the two kinds of fractures is estimated *** view of difficulties in locating the preferential flow pathway of natural fracture networks,by numerical tests a transect permeability weighted algorithm for estimating the fracture network permeability is *** algorithm is not specific to one or more particular preferential flow pathways,but considers the contribution of each section to hinder the fluid passing through the *** order to apply the new algorithm,by capturing the structure of fracture networks based on the image-processing technique,the numerical simulations of seepage flow passing through two groups of natural fracture networks is carried out,the permeability is forecasted and the partial flows are reproduced for both *** is found that the preferential flow pathway emerges at the beginning of evolution,then is strengthened subsequently,and finally reaches a steady ***,by using the proposed method some details on local flow can be clearly observed such as backflows and vortices at local branches can exist simultaneously and so forth,suggesting the validness of the proposed method for multiscale simulations of seepage flow.

关键词： MRT-LBM fractal interpolation fracture networks seepage flow simulation microcosmic mechanism

Secure output synchronization of heterogeneous multi-agent systems against false data injection attacks

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2022年第6期65卷 142-154页

作者： Shicheng huo Dalin HUANG Ya ZHANG School of Automation Southeast University School of Cyber Science and Engineering Southeast University Key Laboratory of Measurement and Control of Complex Systems of Engineering Ministry of Education

This paper studies secure output synchronization for heterogeneous multi-agent systems against false data injection(FDI) attacks. Both the sensors and actuators of agents may be injected into FDI *** mitigate the malicious impact of these attacks on synchronization performance, a desired reference model,which is combined with an auxiliary system, is first designed for each agent to simulate its normal system dynamics. Then, based on this reference model, a state feedback cooperative controller and a static output feedback cooperative controller, which consist of adaptive compensators, are proposed, respectively. The integrated control protocols can ensure that the output synchronization error is small by adjusting some designed parameters even in the presence of FDI attacks. An illustrative example is employed to demonstrate the effectiveness of the proposed method.

关键词： output synchronization false data injection attacks adaptive compensators heterogeneous multi-agent systems secure control

同方期刊数据库

Dynamics and near-optimal control in a stochastic rumor propagation model incorporating media coverage and Lévy noise

在线全文

学校读者我要写书评

暂无评论

Chinese physics B 2022年第3期31卷 146-159页

作者： Liang'an huo Yafang Dong Business School University of Shanghai for Science and TechnologyShanghai 200093China

The appearance of rumors intensifies people’s panic and affects social stability. How to control the spread of rumors has become an important issue which is worth studying. In order to more accurately reflect the actual situation in the real world, a stochastic model incorporating media coverage and Lévy noise is proposed to describe the dynamic process of rumor propagation. By introducing two control strategies of popular science education and media coverage in an emergency event, an near-optimal control problem that minimizes the influence and control cost of rumor propagation is *** conditions for near-optimal control of the model are established by using a Hamiltonian function. Then the necessary conditions for near-optimal control are obtained by using the pontryagin maximum principle. Finally, the effect of popular science education, media coverage and Lévy noise on rumor propagation process control is verified by numerical simulation.

关键词： rumor propagation near-optimal control popular science education media coverage Lévy noise

Current status and development of percutaneous coronary intervention in China

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第8期11卷 631-633页

作者： Yong huo Department of Cardiology and Heart Center Peking University FirstHospital Beijing 100034 China

Dr. Gruntzig et al. （1979） successfully completed the world＇s first percutaneous coronary intervention （pCI）, a percutaneous transluminal coronary angioplasty （pTCA）, in 1977. The first reported pTCA in China was in 1984. With the development of pCI techniques, while more and more patients have benefited, there are ongoing challenges as well.

关键词： pCI Current status and development of percutaneous coronary intervention in China