检索结果-南通市图书馆

A VNS-NPGA Approach to Multi-Objective Optimization of Hub-and-spoke Logistics Network

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

Journal of Traffic and Transportation Engineering(English Edition) 2024年

作者： Changxi Ma Chuwei Shi Yun Yang Yongpeng Zhao Zhuye Xu Bo Du School of Traffic and Transportation Lanzhou Jiaotong University Key Laboratory of Railway lndustry on Plateau Railway Transportation Intelligent Management and Control Lanzhou Jiaotong University School of Tourism and Management Yangling Vocational and Technical College School of New Energy and Power Engineering Lanzhou Jiaotong University National Engineering research Center of Highway Maintenance Technology Changsha University of science & Technology SMART Infrastructure Facility University of Wollongong

To realize low-cost freight transport in the logistics network and improve the network operation efficiency， a multi-objective optimization model and the corresponding algorithm for a hub-and-spoke logistics network are proposed based on the multi-level location of hub points and channels layout. By considering the structure of the multi-level hub-and-spoke logistics network and the features of the connectivity between the hub and spoke points， the multi-objective optimization model is constructed with two objectives of minimizing the total network operation costs and the total network service time. By considering the characteristics of decision variables and models， a Variable Neighborhood Search (VNS)-Niched Pareto Genetic Algorithm (NPGA) approach with a three-stage encoding structure chromosome is proposed， where the VNS algorithm nested in NPGA is used for individual variable neighborhood search to optimize individual channel level genes， and NPGA is adopted to solve the multi-objective optimization model. To evaluate the performance of the proposed VNS-NPGA approach， a real-life case study based on a small-scale Australia Post data set was conducted， and 25 nodes of the Australia Post and 14 nodes of the gansu Province 3-level hub-and-spoke logistics networks were established， respectively. The analysis results indicated that the network structure of multi-level hub points could avoid the detour problem existing in the traditional hub-and-spoke network， and showed better applicability in the narrow geographical structure. Compared to the traditional multi-objective evolutionary algorithms， VNS-NPGA can obtain better solutions through the distributed optimization of channel levels， avoiding the problem that a single algorithm cannot effectively deal with coupling relationships in genes.

关键词：

Bibliometric analysis and system review of vehicle routing optimization for emergency material distribution

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 Traffic and Transportation Engineering(English Edition) 2022年第6期9卷 893-911页

作者： Jinxing Shen Kun Liu Changxi Ma Yongpeng Zhao Chuwei Shi College of Civil and Transportation Engineering Hohai UniversityNanjing 210098China School of Traffc and Transportation Lanzhou Jiaotong UniversityLanzhou 730070China

Determining the optimal vehicle routing of emergency material distribution(VREMD)is one of the core issues of emergency management,which is strategically important to improve the effectiveness of emergency response and thus reduce the negative impact of large-scale emergency *** summarize the latest research progress,we collected 511VREMD-related articles published from 2010 to the present from the Scopus database and conducted a bibliometric analysis using VOSviewer ***,we cautiously selected 49 articles from these publications for system review;sorted out the latest research progress in model construction and solution algorithms;and summarized the evolution trend of keywords,research gaps,and future *** results show that domestic scholars and research organizations held an unqualified advantage regarding the number of published ***,these organizations with the most publications performed poorly regarding the number of literature *** and the US have contributed the vast majority of the literature,and there are close collaborations between researchers from both *** optimization model of VREMD can be divided into single-,multi-,and joint-objective *** shortest travel time is the most common optimization objective in the single-objective optimization *** scholars focus on multiobjective optimization models to consider conflicting objectives *** recent literature,scholars have focused on the impact of uncertainty and special events(e.g.,COVID-19)on ***,some scholars focus on joint optimization models to optimize vehicle routes and central locations(or material allocation)*** algorithms can be divided into two primary categories,i.e.,mathematical planning methods and intelligent evolutionary *** branch and bound algorithm is the most dominant mathematical planning algorithm,while genetic algorithms and their enhancements are the most co

关键词： Transportation engineering Vehicle routing of emergency materials distribution Bibliometric analysis Optimization model Solution algorithms

A review of vehicle speed control strategies

在线全文

学校读者我要写书评

暂无评论

Journal of Intelligent and Connected Vehicles

Journal of Intelligent and Connected Vehicles 2023年第4期6卷 190-201页

作者： Changxi Ma Yuanping Li Wei Meng School of Traffic and Transportation Lanzhou Jiaotong UniversityLanzhou 730070China Key Laboratory of Railway Industry on Plateau Railway Transportation Intelligent Management and Control Lanzhou 730070China gansu Longyuan Information Technology Co. Ltd.Lanzhou 730070China

Currently,traffic problems in urban road traffic environments remain severe,traffic pollution and congestion have not been effectively improved,and traffic accidents are still *** traffic signal control methods have little effect on these *** the continuous improvement of communication technology and network connections,vehicle speed guidance provides a new idea for solving the above problems and has gradually become a popular topic in academic ***,its generalization has ***,this paper summarizes the research on vehicle speed control strategies in urban road environments and provides suggestions for future *** this paper,we summarize the existing research in four ***,we categorize existing research based on vehicle ***,the vehicle speed guidance problem is divided according to the problem research ***,we summarize the existing literature regarding vehicle ***,we summarize the methods used for speed *** an analysis of the existing literature,it is concluded that there is a deficiency in the existing research,and suggestions for the future of vehicle speed guidance research are suggested.

关键词： speed guidance vehicle control vehicle trajectory planning intelligent transportation

An overview of Hadoop applications in transportation big data

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

Journal of Traffic and Transportation Engineering(English Edition) 2023年第5期10卷 900-917页

作者： Changxi Ma Mingxi Zhao Yongpeng Zhao School of Traffic and Transportation Lanzhou Jiaotong UniversityLanzhou 730070China Key Laboratory of Railway lndustry on Plateau Railway Transportation Intelligent Management and Control Lanzhou Jiaotong UniversityLanzhou 730070China gansu Highway Traffic Construction Group Co. Ltd.Lanzhou 730000China

As an open-source cloud computing platform,Hadoop is extensively employed in a variety of sectors because of its high dependability,high scalability,and considerable benefits in processing and analyzing massive amounts of ***,to derive valuable insights from transportation big data,it is essential to leverage the Hadoop big data platform for analysis and *** summarize the latest research progress on the application of Hadoop to transportation big data,we conducted a comprehensive review of 98 relevant articles published from 2012 to the ***,a bibliometric analysis was performed using VOSviewer software to identify the evolution trend of ***,we introduced the core components of ***,we systematically reviewed the98 articles,identified the latest research progress,and classified the main application scenarios of Hadoop and its optimization *** on our analysis,we identified the research gaps and future work in this *** review of the available research highlights that Hadoop has played a significant role in transportation big data research over the past ***,the focus has been on transportation infrastructure monitoring,taxi operation management,travel feature analysis,traffic flow prediction,transportation big data analysis platform,traffic event monitoring and status discrimination,license plate recognition,and the shortest ***,the optimization framework of Hadoop has been studied in two main areas:the optimization of the computational model of Hadoop and the optimization of Hadoop combined with *** research results have been achieved in the field of transportation big ***,there is less systematic research on the core technology of Hadoop,and the breadth and depth of the integration development of Hadoop and transportation big data are not *** the future,it is suggested that Hadoop may be combined with other big data frameworks such a

关键词： Information technology Transportation big data Hadoop Intelligent transportation Cloud computing

Prediction of Remaining Parking Spaces Based on EMD-LSTM-BiLSTM Neural Network

在线全文

学校读者我要写书评

暂无评论

Journal of Traffic and Transportation Engineering(English Edition) 2023年

作者： Changxi Ma Xiaoting Huang Ke Wang Yongpeng Zhao School of Traffic and Transportation，Lanzhou Jiaotong University

The traffic congestion caused by the mismatch between the demand of car owners and the supply of parking spaces has become one of the severe traffic problems in various places. It is important to predict the remaining parking space which can not only help the driver to plan their trips reasonably but also reduce the pressure on urban road traffic. To reduce the stochastic fluctuations of complex data and improve the predictability of parking spaces， a hybrid prediction model EMD-LSTM-BiLSTM is proposed， which is combined the adaptive ability of empirical mode decomposition (EMD) to process time series data and the advantage of long short-term memory network (LSTM) and bidirectional long short-term memory network (BiLSTM) to solve long-range dependencies. First， the EMD algorithm is employed to decompose the components of different scales in the time series and generate a series of mode functions with the same characteristic scale. Next， the construction， training， and prediction of the LSTM-BiLSTM neural network are completed in the deep learning framework Keras. BiLSTM was built for proposing the bi-directional temporal features of the sequences， and LSTM was responsible for learning the output features， which effectively avoids large prediction errors. Finally， the performance of the model is verified by the actual parking data sets of different parking lots for parking space prediction. The proposed hybrid model is compared with a variety of current mainstream deep learning algorithms， and the effectiveness of the EMD-LSTM-BiLSTM method is validated. The results may provide some potential insights for parking prediction.

关键词：

Advances in nuclear detection and readout techniques

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nuclear science and Techniques 2023年第12期34卷 281-358页

作者： Rui He Xiao‑Yang Niu Yi Wang Hong‑Wei Liang Hong‑Bang Liu Ye Tian Hong‑Lin Zhang Chao‑Jie Zou Zhi‑Yi Liu Yun‑Long Zhang Hai‑Bo Yang Ju Huang Hong‑Kai Wang Wei‑Jia Han Bei Cao Gang Chen Cong Dai Li‑Min Duan Rui‑Rui Fan Fang‑Fa Fu Jian‑Hua Guo Dong Han Wei Jiang Xian‑Qin Li Xin Li Zhuo‑Dai Li Yu‑Tie Liang Shun Liao De‑Xu Lin Cheng‑Ming Liu Guo‑Rui Liu Jun‑Tao Liu Ze Long Meng‑Chen Niu Hao Qiu Hu Ran Xiang‑Ming Sun Bo‑Tan Wang Jia Wang Jin‑Xiang Wang Qi‑Lin Wang Yong‑Sheng Wang Xiao‑Chuan Xia Hao‑Qing Xie He‑Run Yang Hong Yin Hong Yuan Chun‑Hui Zhang Rui‑Guang Zhao Ran Zheng Cheng‑Xin Zhao Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear science and Technology University of Chinese Academy of SciencesBeijing 100049China Advanced Energy science and Technology Guangdong Laboratory Huizhou 516000China Key Laboratory of Particle and Radiation Imaging Department of Engineering PhysicsTsinghua UniversityBeijing 100084China School of Integrated Circuits Dalian University of TechnologyDalian 116020China Guangxi Key Laboratory for Relativistic Astrophysics School of Physical Science and TechnologyGuangxi UniversityNanning 530004China School of Nuclear science and Technology Lanzhou UniversityLanzhou 730000China State Key Laboratory of Particle Detection and Electronics University of Science and Technology of ChinaHefei 230026China Department of Radiation Oncology National Cancer Center/National Clinical Research Center for Cancer/Cancer HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100021China Electronic Engineering School Heilongjiang UniversityHarbin 150080China Spallation Neutron Source science Center Dongguan 523803China Micro‑electronic Department Harbin Institute of TechnologyHarbin 150001China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210034China Liaoning Academy of Materials Shenyang 110167China Istituto Nazionale di Fisica Nucleare Sezione di PerugiaPerugiaItaly School of Mathematics and Physics Chengdu University of TechnologyChengdu 620035China PLAC Key Laboratory of Quark and Lepton Physics(MOE)Central China Normal UniversityWuhan 430079China School of Electronics and Information Northwestern Polytechnical UniversityXi’an 710129China State Key Lab of Superhard Materials College of PhysicsJilin UniversityChangchun 130012China School of Computer science Northwestern Polytechnical UniversityXi’an 710129China

“A Craftsman Must Sharpen His Tools to Do His Job,”said *** detection and readout techniques are the foundation of particle physics,nuclear physics,and particle astrophysics to reveal the nature of the ***,they are being increasingly used in other disciplines like nuclear power generation,life sciences,environmental sciences,medical sciences,*** article reviews the short history,recent development,and trend of nuclear detection and readout techniques,covering Semiconductor Detector,Gaseous Detector,Scintillation Detector,Cherenkov Detector,Transition Radiation Detector,and Readout *** explaining the principle and using examples,we hope to help the interested reader underst and this research field and bring exciting information to the community.

关键词： Silicon detector Wide bandgap detector Time projection chamber(TPC) Multigap resistive plate chamber detector(MRPC) Scintillation detector Calorimeters Cherenkov detector Transition radiation detector Artificial intelligence Trigger-less readout

Asymptotic Behavior of Solutions for the Porous Media Equations with Nonlinear Norm-type Sources

在线全文

学校读者我要写书评

暂无评论

Journal of Partial Differential Equations 2022年第3期35卷 240-258页

作者： XUE Yingzhen School of Business Xian International UniversityXi'an 710077China

In the paper,the asymptotic behavior of the solution for the parabolic equation system of porous media coupled by three variables and with weighted nonlocal boundaries and nonlinear internal sources is *** constructing the upper and lower solutions with the ordinary differential equation as well as introducing the comparison theorem,the global existence and finite time blow-up of the solution of parabolic equations of porous media coupled by the power function and the logarithm function are *** differential inequality technique is used to obtain the lower bounds on the blow up time of the above equations under Dirichlet and Neumann boundaryconditions.

关键词： Porous media equations norm-type sources the global existence the finite time blow-up the blow up time

Effects of increase extent of voltage on wear and corrosion resistance of micro-arc oxidation coatings on AZ91D alloy

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

中国有色金属学会会刊：英文版 2008年第A1期18卷 354-360页

作者：吕维玲陈体军马颖徐卫军杨健郝远 State Key Laboratory of gansu Advanced Nonferrous Metal Materials Lanzhou University of Technology College of Chemical and Industry Gansu Lianhe University

The effects of increase extent of voltage on the wear resistance and corrosion resistance of micro-arc oxidation(MAO) coatings on AZ91D magnesium alloy were investigated in silicate *** results show that with increasing extent of voltage, both of the thickness and bonding force of MAO coatings first increase,and then *** parameters are all up to their maximum values when the increase extent of voltage is 20 *** roughness of the coatings always *** coating has the best corrosion resistance when the increase extent of voltage is not below 25 V,and the coating has the best wear resistance when the increase extent of voltage is 10 *** wear mechanisms for the micro-arc oxidation are abrasive wear and micromachining wear. These are related to their microstructures.

关键词： AZ91D合金镁合金金属表面热处理

Lower Bound of Blow-Up Time for Solutions of a Class of Cross Coupled Porous Media Equations

在线全文

学校读者我要写书评

暂无评论

Wuhan University Journal of Natural sciences 2021年第4期26卷 289-294页

作者： XUE Yingzhen College of Business Xi’an International UniversityXi’an 710077ShaanxiChina

In this paper,blow-up phenomena of solutions to a class of parabolic equations for porous media with nonlocal source terms cross-coupled under Dirichlet and Neumann boundary conditions are *** differential inequality techniques are used to obtain the lower bounds on the blow up time of the equation set under two different boundary conditions.

关键词： porous media equations nonlocal source terms blow-up time