排序方式: 共有132条查询结果,搜索用时 46 毫秒
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不确定信息下应急救援路径选择模型 总被引:2,自引:0,他引:2
迅速有效的震后交通疏散及道路管制措施对降低地震损失具有重要意义.通过定义路网疏散连通度和安全行驶路线,对不确定信息条件下救援疏散和路径选择问题进行描述.将避难点分配、路径规划、车辆容量,以及不确定通行能力作为该问题约束条件,确立了以公交疏散问题为基础的应急救援车辆路径选择模型.考虑到模型仿真的局限性,转化为相同发车间隔下的公交均衡调度问题进行求解.以唐山抽象路网和人口分布为基础进行仿真实验分析,结果表明:不确定信息条件下选择安全救援路径,当救援车辆途中遇阻时,只需调整交叉口转向策略即可顺利通行,保证了救援调度工作的稳定. 相似文献
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The inconsistence between system optimality and user optimality represents one of the key difficulties on network traffic congestion control. The advanced connected vehicle systems, enabling smart vehicles to possess/exchange real-time information and conduct portable computation, provide new opportunities to address this challenge. Motivated by this view, this study proposes a coordinated online in-vehicle routing mechanism with intentional information provision perturbation (CRM-IP), which seeks to shape individual vehicles online routing decisions so that user optimality and system optimality are balanced, by exploiting bounded rationality of the users. The proposed CRM-IP is modeled as a pure strategy atomic routing game, and implemented by a sequentially updating distributed algorithm. The mathematical analysis is conducted to quantify the absolute gain of system optimality corresponding to the loss of user optimality resulting from a given level of the information perturbation in the worst case so that the efficiency of the information perturbation can be evaluated. Furthermore, numerical experiments conducted based on City of Sioux Falls network investigate the average effects of the CRM-IP on system optimality and user optimality under various network traffic conditions, comparing to the CRM developed by Du et al. (in press). The results indicate that the improvement of system optimality and the reduction of individual vehicles’ travel time from the CRM is more significant when the network traffic is under an mild congestion state, such as under the levels of service (LOS’s) C, D, and E, rather than under extremely sparse or congested states, such as under LOS’s A and B, or F. Moreover, higher level of information perturbation benefits system optimality more, but the marginal effect decreases after the perturbation reaching certain level, such as in this case study. In addition, a portion of vehicles may sacrifice user optimality due to the information perturbation, but the extent of the sacrifice is not significant, even though it increases with the information perturbation level. Hence, a small information perturbation is recommended to achieve an efficient network traffic control through the CRM-IP. Overall, this study proposes the CRM-IP as an efficient routing mechanism, which has a great potential to guide the routing decisions of individual vehicles so that their collective behavior improve network performance in both system optimality and user optimality. 相似文献
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教育应与区域社会经济协调发展 总被引:1,自引:0,他引:1
区域教育结构和教育体系已经不能适应区域社会经济的发展,也不能适应社会主义新农村的建设,必须按科学发展观的要求,重新定义区域教育的发展方向、结构和体系。区域教育的首要目标是促进和服务区域社会经济的协调发展。 相似文献
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客运专线的设计咨询有利于优化设计方案,提高铁路设计质量和水平。就如何做好该项工作,提出一些有关工作内容和优化方法。 相似文献
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铁路工程协同设计系统中质量管理的实现 总被引:2,自引:2,他引:0
《铁道标准设计通讯》2017,(4):54-59
铁路设计企业专业多,文件流转频繁,设计过程复杂。为了将质量管理工作落实到协同设计管理系统中,以提高设计成果质量和设计工作效率。结合近年来铁路工程设计的实际情况,在总结工程设计过程管理控制与质量控制经验的基础上,结合企业协同设计管理系统建设经验,提出通过信息化手段加强设计质量管理、提高设计产品质量的思路和措施。符合本文思路的软件成果已投入实际工程项目进行试运行。经过验证,在项目生产计划编制合理的前提下,系统能够支撑生产计划的顺利推进,能够记录生产过程中产生的质量管理数据,缩短设计成果审核周期,实现了通过信息化手段,加强设计过程管理,提高设计成果质量的目的。 相似文献
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随着市场竞争的日益加剧和客户需求的多样化、个性化,迫使企业不得不采用大批量定制生产方式等先进的设计、制造和管理技术,以支持管理企业目前存在着的大量产品设计和工艺资源。论述其条件下的工业产品设计要求。 相似文献
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全回转吊舱式推进器线型设计 总被引:1,自引:0,他引:1
对吊舱推进器的特点、水动力性能以及代表厂商和产品进行了介绍。通过对线型设计时所需注意事项的分析,展示了其在多种船型领域的适用性。 相似文献
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为了实施高速公路路网交通流的优化控制,采用MATANET模型进行路网交通流建模,应用非线性最优控制方法,构造了路网入口匝道的协调控制模型。该模型应用全局实时交通数据,以总费用时间与密度控制的组合构建性能指标,能够提高交通运行效率,并有效处理交通拥挤。针对模型的非线性,应用遗传算法对性能指标进行优化,探究TTS-密度控制指标的优化对路网交通拥挤状况的控制效果。以南京市周边高速公路路网作为应用实例,验证了所研究模型与优化方法的可行性。 相似文献