共查询到20条相似文献，搜索用时 15 毫秒
1.
Line planning is the first important strategic element in the railway operation planning process, which will directly affect
the successive planning to determine the efficiency of the whole railway system. A two-layer optimization model is proposed
within a simulation framework to deal with the high-speed railway (HSR) line planning problem. In the model, the top layer
aims at achieving an optimal stop-schedule set with the service frequencies, and is formulated as a nonlinear program, solved
by genetic algorithm. The objective of top layer is to minimize the total operation cost and unserved passenger volume. Given
a specific stop-schedule, the bottom layer focuses on weighted passenger flow assignment, formulated as a mixed integer program
with the objective of maximizing the served passenger volume and minimizing the total travel time for all passengers. The
case study on Taiwan HSR shows that the proposed two-layer model is better than the existing techniques. In addition, this
model is also illustrated with the Beijing-Shanghai HSR in China. The result shows that the two-layer optimization model can
reduce computation complexity and that an optimal set of stop-schedules can always be generated with less calculation time. 相似文献
2.
以单计划周期内总生产成本最小为目标,考虑回收件质量差异对生产成本的影响,建立了面向再制造生产计划的非线性整数规划模型.采用3种不同的再制造和废弃策略,比较总生产成本的变化规律.研究结果表明:当回收量小于需求量时,无需考虑分级,但需使用新零部件以满足再制造需求;当回收量大于需求量时,优先采用高质量回收件和优先废弃低质量的... 相似文献
3.
Aiming at the diversity and nonlinearity of the elevator system control target, an effective group method based on a hybrid
algorithm of genetic algorithm and neural network is presented in this paper. The genetic algorithm is used to search the
weight of the neural network. At the same time, the multi-objective-based evaluation function is adopted, in which there are
three main indicators including the passenger waiting time, car passengers number and the number of stops. Different weights
are given to meet the actual needs. The optimal values of the evaluation function are obtained, and the optimal dispatch control
of the elevator group control system based on neural network is realized. By analyzing the running of the elevator group control
system, all the processes and steps are presented. The validity of the hybrid algorithm is verified by the dynamic imitation
performance. 相似文献
4.
陈瑞晶 《福建工程学院学报》2008,6(Z1)
对福建省道路交通运输事故宏观影响因素进行分析,采用灰色关联度分析法对事故影响因素进行量化,确定各宏观因素之间的关系度排序,认为驾驶员、客运量、客运周转量、通车里程和出行次数影响道路交通安全的主要宏观因素,并对此向交通管理部门提出应对策略. 相似文献
5.
科学准确地预测铁路客运量是制定铁路网规划的基础。以全国铁路客运量的历史数据为基础,采用灰色GM（1,1）模型和三次指数平滑模型进行组合优化,建立了基于IOWGA（Induced Ordered Weighted Geometric Averaging）算子的组合预测模型,并对组合预测模型进行了检验,检验结果表明,组合预测模型是有效的、可靠的,具有较高的精度,可对我国的铁路客运量进行预测。最后利用所建立的预测模型预测了2008年--2010年我国铁路客运量。 相似文献
6.
基于工程网络计划技术规程(JGJ/121-99),通过实例,介绍了自由时差和总时差在双代号时标网络计划中直观表示的方法. 相似文献
7.
乡村旅游作为贵阳市旅游业的重要组成部分,已成为贵阳市解决好“三农”问题、建设生态文明城市的有效途径。贵阳市发展乡村旅游的有利条件是生态优势明显、旅游资源丰富、交通便利、客源充足、政策优惠,但也存在开发模式单一、开发层次低、投入不足、开发无序、宣传力度不够等问题,必须从加强科学规划、挖掘文化内涵、加强基础设施建设、健全服务体系、处理好开发与保护的关系、加大宣传力度等方面采取有效对策发展贵阳市乡村旅游。 相似文献
8.
《营销策划》是一门实践性较强的课程。在营销策划课程的教学中应着重培养学生的想、写、说、做四种能力。以小组合作式教学法为形式,尝试教学法和任务驱动教学法为手段的"三合一"教学方法,以学生小组为学习单元,教师针对课程内容的不同采用不同的教学方法,多种方法相结合使用,最终达到理论和技能的双重提高。在教学过程中,要注意发挥小组的重要作用、控制小组人数、综合考虑来评定最终成绩、认清教师自身职责等。 相似文献
9.
Jianping 《上海大学学报(英文版)》1998,(2)
１ＩｎｔｒｏｄｕｃｔｉｏｎＢｅｃａｕｓｅｏｆｔｈｅｆａｓｔｄｅｖｅｌｏｐｍｅｎｔｏｆｅｃｏｎｏｍｙ,ｃｉｔｉｅｓａｒｅｂｅｃｏｍｉｎｇｌａｒｇｅｒａｎｄｌａｒｇｅｒ．Ｔｈｅｔｒａｆｉｃ,ｅｓｐｅｃｉａｌｙｔｈｅｐｕｂｌｉｃｔｒａｎｓｐｏｒｔａｔｉｏｎ... 相似文献
10.
本文围绕高速公路客运管理信息微机网络系统的开发,介绍了系统分析、系统设计及系统实现的过程,重点论述了高速公路MIC网络系统的构造方法及总体结构、系统网络布局及系统功能模块的开发设计。 相似文献
11.
邹寒羽 《成都航空职业技术学院学报》2011,27(2):62-66
现代客运交通,已由单一自我封闭的客运方式,逐渐转变为各种交通方式既分工又互补合作的模式,发展成为综合交通枢纽。本文结合成都沙河堡综合交通枢纽工程实际就交通枢纽的组织规划问题进行探讨,从规划布局、交通衔接、流线组织等角度对其枢纽布局设计的合理性进行了简要评价。 相似文献
12.
根据建筑功能要求和当地气候特点,在总体规划和单体设计中,科学合理地确定建筑朝向、平面形状、空间布局、外观体型、间距,选用节能型建筑材料,保证建筑外维护结构的保温隔热等热工特性,应用节能技术措施,尽可能减少建筑物能耗,获得理想的节能效果. 相似文献
13.
In this paper, the open queueing network model is proposed for solving the problem of public transportation in cities. The
vertices of the networks (i.e., the bus stops) are determined by means of the fuzzy clustering method. The arcs (i.e., the
paths of the public transportation) can be set up by using the shortest path model in the time sense or the 0–1 integer programming
method. Applying the statistics method, we can calculate the parameters (such as the passenger flow’s distribution, passenger
flow’s transition probability, mean waiting time for the bus etc.) of the public transportation network. In this paper, we suggest to divide the network into two or three stages to implement
the public transportation system in the form of “frog jumping” fast transfer and “permeation” fast dispersion. Combining the
computer simulation and the evaluation of the achievement and effect of public transportation system, we modify the model
so as to solve the public transportation problem better. 相似文献
14.
张海峰 《河北工业大学成人教育学院学报》2006,21(1):39-44
神经网络是一种新兴的数学建模方法,它具有识别复杂非线性系统的特性,比较适合实时调度。论文对神经网络模型-BP神经网络的结构及算法进行了描述,在此基础上提出了基于BP神经网络的实时调度预测模型。基于BP神经网络的实时调度预测模型的输入变量是相关站点同一时间段的客流量,输出变量为发车调度形式。 相似文献
15.
蛛形图是一个重要的网络拓扑结构,研究它的染色对于网络权的分配有重要的指导作用。利用穷举法和组合分析法讨论了蛛形图的全染色和星全染色,得到了蛛形图的全色数和星全色数,丰富了图染色的内容。 相似文献
16.
农村客运网络布局模式与发展政策研究 总被引：1，自引：0，他引：1
邢春 《宁波职业技术学院学报》2006,10(3):16-17,54
根据国家建设社会主义新农村的要求,农村客运成为道路客运行业发展重心。农村客运具有不同于城际干线客运的内在规律,应研究与其相适应的发展模式和发展政策。本文从农村客运特性分析开始,提出农村客运网络布局模式,并对其内在经济机理进行剖析,最后推导出适合农村客运发展的有关政策。 相似文献
17.
有效地混合了遗传算法和基于约束满足的自适应神经网络算法,对于一类加工时间可变的调度问题进行了研究.遗传算法被用来进行迭代寻优.当前代经交叉和变异后生成的染色体对应非可行解,由自适应神经网络运算后得到可行解,对应的染色体作为新一代染色体.本算例的目标函数是基于任务的提前/拖期惩罚、附加惩罚以及加工时间的偏离量惩罚,目标是确定最优加工时间和最优加工顺序极小化目标函数,并与一般的遗传算法相比较,实验结果说明了遗传/自适应神经网络算法混合算法的有效性. 相似文献
18.
In the traditional power transmission network planning,deterministic analysis methods are widely used.In such methods,all contingencies are deemed to have the same occurrence probability,which is not reasonable.In this paper,risk assessment is introduced to the process of transmission network planning considering the probabilistic characteristics of contingencies.Risk indices are given to determine the weak points of the transmission network based on local information,such as bus risk,line overload risk,contingency severity.The indices are calculated by the optimal cost control method based on risk theory,which can help planners to quickly determine weak points in the planning and find solution to them.For simplification,only line overload violation is considered.Finally,the proposed method is validated by an IEEE-RTS test system and a real power system in China from two aspects.In the first case,the original system is evaluated by the proposed method to find the weak points,and then four planning schemes are established,among which the best scheme is selected.In the second case,four initial planning schemes are established by combining the experiences of planners,and after the evaluation by using the proposed method,the best planning scheme is improved based on the information of weak points in the initial schemes,and the risk of improved scheme is reduced from 42 531.86 MW·h per year to 4 431.26 MW·h per year. 相似文献
19.
移动机器人在工业生产和社会生活中逐步得到应用。路径规划是移动机器人完成其任务的前提和基础,也是机器人导航的核心技术。针对移动机器人在现有局部路径规划中无法自适应复杂环境、规划路径不合理等问题,提出基于权值自适应的局部路径规划方法。利用传感器信息自动获取合理的目标函数权值,实现具有较高实时性、安全性和鲁棒性的局部路径规划。实验结果表明,改进的动态窗口法能有效自适应复杂环境,规划的路径安全、合理、平滑,算法效率明显提升,计算量和迭代次数明显减少,总运行时间缩短20%以上。 相似文献
20.
城市出租车客运市场车辆总量调控问题研究 总被引：2，自引：0，他引：2
王成钢 《武汉职业技术学院学报》2005,4(5):29-31
当前我国城市出租车总量失控，严重供过于求。有人主张采用特许经营办法对其实行总量控制。文章认为城市出租车客运不属于特许经营范围，总量调控的途径应是形成城市出租车客运市场价格机制，通过车辆购置税调节市场供求关系。 相似文献