Research on the Coupled and Coordinated Development of Tourism and Transport in Chengdu City

Based on a total of 16 indicators selected from the tourism and transport industries,an evaluation index system of the coupling and coordination development level of tourism and transport is constructed.The entropy value method and the coupling coordination degree model are used to conduct an empirical study on the development level and coupling coordination level of the transport and tourism industries in Chengdu City from 2011 to 2020.The results show that,on the whole,the coupling coordination degree of transport and tourism in Chengdu is poor and has been in a state of mild to moderate dysfunction.The development level of tourism lagged behind the development of transport from 2011 to 2012,and the two were in a state of mild dysfunction.However,from 2013 onwards,the development level of tourism was prioritized over the development level of transport.This shift caused the coupling coordination degree of the two industries to decline sharply to 0.23305 in 2013.The development level of the tourism industry increased again,reaching 0.34206 in 2019,which marked an improvement.Consequently,the coordination degree of the transport and tourism industries evolved from moderate dislocation to mild dislocation.Finally,the results of the empirical research are analyzed,and corresponding suggestions are put forward to promote the sustainable growth of the transport and tourism industries in Chengdu City.These suggestions aim to improve the coupled and coordinated development level of the two industries.

Research on the Coupled and Coordinated Development of Tourism and Transport in Chongqing Municipality

By examining the current status of tourism and transport research both domestically and internationally,and analyzing the development trends of Chongqing’s tourism and transport industry,this study evaluates the weight indices and performs a coupling and coordination analysis of various indicators of Chongqing’s tourism and transport industry from 2011 to 2019.The following conclusions are drawn:(1)The value of the comprehensive evaluation function for tourism is higher than that of the transport industry,indicating that Chongqing’s tourism industry is in a period of vigorous development;(2)The degree of coupling coordination development between Chongqing’s tourism and transportation industries from 2011 to 2019 is rising.As the coupling coordination stage continues to improve,the level of coupling coordination also improves,with the overall trend showing a progression from mild dysfunction to primary coordination.Based on these conclusions,corresponding countermeasures are proposed to promote the coupling coordination between tourism and transport in Chongqing,and suggestions are made for the overall improvement of the transport industry and the sustainable development of the tourism industry.

Non-Cooperative Game of Coordinated Scheduling of Parallel Machine Production and Transportation in Shared Manufacturing

Given the challenges of manufacturing resource sharing and competition in the modern manufacturing industry,the coordinated scheduling problem of parallel machine production and transportation is investigated.The problem takes into account the coordination of production and transportation before production as well as the disparities in machine spatial position and performance.A non-cooperative game model is established,considering the competition and self-interest behavior of jobs from different customers for machine resources.The job from different customers is mapped to the players in the game model,the corresponding optional processing machine and location are mapped to the strategy set,and the makespan of the job is mapped to the payoff.Then the solution of the scheduling model is transformed into the Nash equilibrium of the non-cooperative game model.A Nash equilibrium solution algorithm based on the genetic algorithm(NEGA)is designed,and the effective solution of approximate Nash equilibrium for the game model is realized.The fitness function,single-point crossover operator,and mutation operator are derived from the non-cooperative game model’s characteristics and the definition of Nash equilibrium.Rules are also designed to avoid the generation of invalid offspring chromosomes.The effectiveness of the proposed algorithm is demonstrated through numerical experiments of various sizes.Compared with other algorithms such as heuristic algorithms(FCFS,SPT,and LPT),the simulated annealing algorithm(SA),and the particle swarm optimization algorithm(PSO),experimental results show that the proposed NE-GA algorithm has obvious performance advantages.

Coordinated Scheduling of Two-Agent Production and Transportation Based on Non-Cooperative Game

A two-agent production and transportation coordinated scheduling problem in a single-machine environment is suggested to compete for one machine from different downstream production links or various consumers.The jobs of two agents compete for the processing position on a machine,and after the pro-cessed,they compete for the transport position on a transport vehicle to be trans-ported to two agents.The two agents have different objective functions.The objective function of the first agent is the sum of the makespan and the total trans-portation time,whereas the objective function of the second agent is the sum of the total completion time and the total transportation time.Given the competition between two agents for machine resources and transportation resources,a non-cooperative game model with agents as game players is established.The job pro-cessing position and transportation position corresponding to the two agents are mapped as strategies,and the corresponding objective function is the utility func-tion.To solve the game model,an approximate Nash equilibrium solution algo-rithm based on an improved genetic algorithm(NE-IGA)is proposed.The genetic operation based on processing sequence and transportation sequence,as well as the fitness function based on Nash equilibrium definition,are designed based on the features of the two-agent production and transportation coordination scheduling problem.The effectiveness of the proposed algorithm is demonstrated through numerical experiments of various sizes.When compared to heuristic rules such as the Longest Processing Time first(LPT)and the Shortest Processing Time first(SPT),the objective function values of the two agents are reduced by 4.3%and 2.6% on average.

A Distributed Self-Consistent Control Method for Electric Vehicles to Coordinate Low-Carbon Transportation and Energy

Dear Editor,In this letter, a distributed self-consistent control method to coordinate low-carbon transportation and energy is proposed to address the efficient utilization of regional transportation energy and renewable energy. Specifically, taking into account the coordinated development of transportation, power grids, and renewable energy, transportation energy self-consistent, including instant self-consistent rate and power self-consistent rate。

The coordinated development of China’s inland water transport

The coordinated development is the core of sustainable development and the hot issue of international research.Inland water transport(IWT) is an important part of the water resources exploiting system and comprehensive transport system under socio-economic context of river basin,and also the country's sustainable development priorities to achieve resource-conserving and environment-friendly strategy.Based on the coordinated development content,the paper combined Germany's successful development experience,explored the elements and problem of the coordinated development of IWT system of China's national economic strategy and basin economy,water resourse system,comprehensive transport system,and system itself,and their countermeasures and suggestions,in order to facilitate rapid and coordinated development of China's inland water transport.

Numerical model of flow and pollutant transportation in non-orthogonal curvilinear coordinates

The planar 2D k-ε double equations' turbulence model was adopted and transformed into non-orthogonal curvilinear coordinates. The concentration convection-diffusion was introduced to planar 2D SIMPLEC algorithm of flow in non-orthogonal curvilinear coordinates. The numerical model of pollutant transportation in non-orthogonal curvilinear coordinates was constructed. The model was applied to simulate the flow and pollutant concentration fields. In the testing concentration field, two optimal operations of contamination discharging both along bank and in the centerline at the first bend of the meandering channel were adopted. Comparison with available data showed the model developed was successful, was valuable to engineering application.

基于公交优先的干线协调信号控制改进模型

基于公交信号优先策略,对MULTIBAND模型进行改进,重新定义了权重系数、车道清空时间和最小绿波带宽,结合不同相位放行方式实施红灯早断或绿灯延长控制策略,并在此基础上考虑公交车辆的车速与停靠时间,建立对公交车辆的约束,提出基于公交优先的干线协调信号控制改进模型。通过VISSIM仿真,将该模型与传统干线协调信号控制模型对比分析,结果表明:与传统协调控制模型相比,模型使社会车辆平均延误降低了4.77%,停车次数降低了3.77%,公交车辆平均延误降低了11.35%,停车次数降低了2.06%,人均延误降低了7.22%,且在不同的公交流量下均有较好的效果。

考虑车流速度分布扰动的干道绿波最大带宽协调控制

城市车辆速度受多种因素影响呈现某种分布,鲁棒的干道协调控制模型应考虑不同速度下的车辆带宽需求。针对速度波动变化干道传统协调控制方法适用性差的问题,分析了带干扰的干道车辆速度时空分布特征,以推荐速度带宽最大与期望带宽最大为目标,提出了考虑车流速度分布扰动的干道绿波最大带宽协调控制方法。针对佛山市同济路4交叉口干道,速度分布扰动干道协调方法能够提供更符合车辆分布特性的协调方案,比Maxband模型和改进的Maxband模型提升约70%和14%的期望带宽。研究结果表明:笔者方法能够降低Maxband模型平均停车次数25%,平均延误45%和平均排队长度17%;针对不同速度期望和方差情况下的灵敏度分析实验表明,该方法能够为干道提供更具有鲁棒性的干道协调控制方案。

“交旅”融合下旅游经济与高速交通协调发展分析——以关中平原城市群为例

关中平原城市群是我国西部旅游资源的重要聚集地,其众多旅游资源开发与社会经济均衡发展亟需高速交通基础设施的支撑。以关中平原城市群为研究对象,基于高速交通和旅游经济评价指标体系,运用熵值法、耦合协调模型等方法,剖析高速交通与旅游经济的综合发展水平,并从时空维度分析两者耦合协调的演化态势,最后探究不同高速交通方式与旅游经济协调发展的差异特征。结果表明:(1)关中平原城市群高速交通与旅游经济综合水平整体呈上升态势,且城市群内部发展存在较大差异。(2)城市群高速交通和旅游经济尚未形成明显协调发展格局,其耦合协调度在时序上呈逐步上升趋势,在空间上逐步向“一圈一轴三带”格局演化。(3)不同的高速交通对系统协调程度和旅游经济边际效应存在明显差异,且与旅游经济的耦合协调度也不同。

计及安全性与舒适性的智能车辆换道轨迹规划研究

针对当前智能车辆在换道过程中的安全性以及乘员舒适性问题,本文提出一种基于风险场评估轨迹的二次筛选方法。首先,在Frenet坐标系下,将车辆运动解耦为横向和纵向两个维度,基于五次多项式生成所有横向d-t曲线簇和纵向s-t曲线簇;其次,由车辆的动力学特性和三圆碰撞模型设计轨迹初筛评价函数,选取合格轨迹作为候选轨迹;最后,参考人工势场理论的思想,引入行车过程中风险场的概念,根据换道效率,换道风险值和横、纵向冲击度建立总损失函数评价候选轨迹以进行二次筛选,选取最佳轨迹并完成可视化。为检验算法的可行性,通过搭建双车道的道路环境,设计障碍车不同速度和加速度的多场景进行弯道换道的仿真验证。研究结果表明,本文所提算法能够满足换道的安全性和舒适性需求。同时,在正常换道场景下,乘员在换道过程的97.5%时间处于舒适状态,在紧急避障场景下也能达到平衡安全性与舒适性的目标。

深圳市轨道交通车站与土地利用互动性研究

城市轨道交通与土地利用发展相互影响,两者协调发展有助于缓解城市交通拥堵,是城市可持续发展的关键问题之一.利用中国深圳市1999年与2015年的建筑普查、土地利用以及轨道交通车站刷卡数据,从开发强度、用地信息熵、车站类型及早晚高峰客流量等多个指标精细化分析轨道交通车站运能与周边土地利用之间的内在联系,并引入“节点-场所”模型构建指标体系评价轨道交通车站与土地利用间的发展协调程度,利用k-means聚类分析将二者协调状态划分为从属状态、平衡状态及失衡状态.结果表明,随着轨道交通车站开发建设,深圳市轨道交通车站周边土地集约利用水平提高;车站客流量与周边土地利用指标的相关性显著,全天客流量与容积率和商办建筑面积显著正相关,早高峰客流量与居住建筑面积和建筑密度显著正相关,而与容积率显著负相关,晚高峰客流量则与商办建筑面积和道路网密度显著正相关.深圳市轨道交通车站与站点周边土地利用协调发展水平偏低,站点类型以节点和场所价值低度均衡发展的从属状态为主,而协调状态则较少且集中分布在中心区圈层.未来应进一步对失衡节点地区采取针对性的开发策略,提升集聚效应与服务水平.

基于动态轨迹规划的自动驾驶车辆协同换道方法

传统的多车协同缺乏对目标队列和换道车辆信息的有效利用,为考虑动态信息变化对换道过程的影响,本文提出基于动态轨迹规划的自动驾驶车辆协同换道控制方法。首先,针对自动驾驶环境下单车进入车辆队列的研究场景,提出基于实时动态信息的协同换道控制框架,在考虑换道车辆与目标队列车辆的合作以及换道行为给目标队列带来影响的基础上,构建非换道期间和换道期间的纵向协同控制模型;之后,在换道车辆发出换道请求并满足换道触发条件后,考虑队列纵向协同目标,根据纵向速度变化动态规划每一时刻的期望轨迹,提出基于正弦曲线的动态换道轨迹规划方法,得到安全和可靠的轨迹曲线,并采用模型预测控制的轨迹跟踪控制算法,实现实时轨迹跟踪;最后,通过搭建Prescan-Simulink联合仿真平台,设计多组不同速度工况下的仿真实验,以及设置传统基于前车—跟随策略的控制算法与本文的控制策略进行对比,综合分析换道触发时间、队列稳定时间和速度波动幅度这3项指标,验证本文控制策略的有效性和可行性。仿真结果表明:本文所设计的协同换道控制策略和传统方法相比,队列的平均稳定时间缩短了34%,队列的速度波动幅度保持稳定,并在不同相对速度的工况下,均能够实现车辆安全和高效地换道。

交通运输业碳排放效率与行业经济增长协调发展研究

为实现我国绿色发展提供参考,基于2010-2019年30个省份数据,采用超效率SBM模型、协调发展指数模型、核密度估计、空间自相关分析、地理探测器等方法,对交通运输业碳排放效率与行业经济增长协调发展水平的时空演化特征及驱动因素进行了研究。研究表明:协调发展水平总体呈小幅波动上升趋势,处于较低的协调发展水平等级,各区域发展不平衡,东部>中部>西部;省域间协调发展水平绝对差异逐渐减小,但出现弱多极化趋势,2010年、2018年、2019年3年协调发展水平存在显著的正相关空间集聚效应,其他年份不存在显著的空间集聚状态;经济驱动力、环境治理力、产业带动力、城镇建设力、科技创新力、能源利用力共同驱动了两者的协调发展。

旅游效率与交通可达性时空演化特征及耦合协调度测算研究以陕西省为例

区域交通可达性的增强对增加旅游人数、刺激旅游消费、提高旅游效率有着正向作用,研究二者之间的相关性对充分释放生产力、提高旅游供给品质具有重要价值。以陕西省为例,对2012—2019年旅游效率及交通可达性的时空演化特征进行分析,并对其耦合协调度进行测算。结果表明:①2012—2019年陕西省总体的旅游效率有所上升,但多个城市的旅游效率都呈现先升后降趋势;②2012—2019年陕西省交通可达性均有了大幅提升,且区域之间的差距有所减小;③陕西省的交通可达性除西安市作为省会有较高的可达性以及对周边地区具有的辐射作用外,总体呈现南北强、东西弱的特点;④陕西省各区域旅游效率与交通可达性的耦合协调水平较高,除商洛市外其他区域都达到了中级协调及以上状态。

供需协调视角下城市应急救援可达性评估--以郑州“7·20”特大暴雨为例

日益频繁的特大暴雨对城市造成愈加严重的影响,亟须关注应急救援需求的变化特征以及与之对应的应急救援可达性水平,以此提升城市应急救援的动态响应能力。以郑州市中心城区为例,通过社交媒体数据识别求救点和道路阻碍点,分析“7·20”特大暴雨背景下应急救援需求的时空分布特征。基于供需协调的视角,利用高斯两步移动搜寻法评估城市应急救援可达性。研究结果表明,应急救援需求具有动态集聚分布特征,同时应急救援可达性存在供需错位。最后,从完善应急救援通道网络、建立应急救援可达性智能评估平台、优化应急救援资源的空间布局三方面提出优化策略。

基于耦合协调模型的地面集输系统能效对标研究

为提高地面集输系统的综合用能水平,充分挖掘内部节能潜力,在构建集输系统能效对标评价体系的前提下,通过改进层次分析法和熵权法对各级指标权重进行了计算,采用博弈论组合赋权方式对指标权重进行赋值,并利用耦合协调模型表示不同子系统间用能水平的协同发展趋势,最后基于现场实例验证了模型的准确性。结果表明:加热炉用能水平的权重为0.5084,对综合用能水平的影响最大,其次为泵机组用能水平和管道用能水平;耦合协调度越高,集输系统的综合用能水平越高。通过多种措施实现了对标和追标工作,优化调整后,预计节约燃油、电和各类维修费用共计1.39亿元以上,节能效果显著。

单口轮放策略下借道左转交叉口优化设计

针对高峰时段交叉口左转车流大、部分相位空放及部分出口道闲置问题,从相位优化和出口道资源最大化利用出发,分析单口轮放预信号设置时间和交通流不对称性,研究交叉口应用单口轮放—借道左转优化方案和不同信号配时方案后,交叉口车均延误、排队长度改善情况。以兰州市天水路—东岗西路交叉口为例,通过VISSIM仿真建模,比较优化前后交叉口各项指标优劣。结果表明:设置优化方案后,高峰时段该交叉口车辆平均延误、平均排队长度分别减少了44.91%、50.61%,平峰时段车辆平均延误、平均排队长度分别降低了40.91%、48.42%;采取Webster配时方法和多目标信号配时优化方法皆可优化信号配时方案,多目标信号配时优化方法优于Webster配时方法。在交通流不对称性明显的交叉口,单口轮放策略优于对称放行。研究成果为城市道路交叉口交通管理和控制提供一定的设计参考。

考虑多车配合的AutoStore系统订单拣选排序研究

为解决AutoStore系统中由于严格要求单辆小车参与整套拣货动作而导致的相同料箱多次翻拣及大量重复成本问题,本文提出堆垛检索概念并设计多车协同拣货作业流程,以减少对料箱的重复翻箱。基于该作业方式建立订单排序优化模型用于求解最优订单序列,并进一步设计了启发式算法SA用于大规模算例求解。数值实验显示,在小规模问题中,SA算法与数学模型最优解的误差仅为0.95%~3.5%;在大规模问题中,SA的性能高出现有方法15%~72%。结果证明了该种作业流程的有效性及SA算法求解订单排序问题的优越性。

数字经济发展对产业链供应链韧性的影响研究

在全球化深入发展与大国竞争加剧的背景下,强化产业链供应链韧性成为各国必须直面的重要议题。文章深入探讨了产业链供应链韧性的核心要素及其作用机制,主要从供需匹配度、稳定性以及供应质量提升三个维度进行了理论剖析。基于上市公司数据检验了数字经济发展对产业链供应链韧性的实际影响。结果显示,数字经济的迅猛发展显著提升了供需匹配的精确度、实现了稳定性的增强以及供应质量的优化,从而有效增强了产业链供应链的韧性。这一结果经过多种稳健性处理后依然成立。此外,文章研究还发现,数字经济的发展对大规模供应商、国有供应商以及市场化程度较高地区的企业产业链供应链韧性提升作用更大。最后,机制检验表明,数字经济发展主要通过减少企业沟通协调与库存运输成本实现产业链供应链韧性的升级。