In this paper, the invulnerability and cascade failures are discussed for the urban bus network. Firstly, three static models（bus stop network, bus transfer network, and bus line network） are used to analyse the str...In this paper, the invulnerability and cascade failures are discussed for the urban bus network. Firstly, three static models（bus stop network, bus transfer network, and bus line network） are used to analyse the structure and invulnerability of urban bus network in order to understand the features of bus network comprehensively. Secondly, a new way is proposed to study the invulnerability of urban bus network by modelling two layered networks, i.e., the bus stop-line network and the bus line-transfer network and then the interactions between different models are analysed. Finally, by modelling a new layered network which can reflect the dynamic passenger flows, the cascade failures are discussed. Then a new load redistribution method is proposed to study the robustness of dynamic traffic. In this paper, the bus network of Shenyang City which is one of the biggest cities in China, is taken as a simulation example. In addition, some suggestions are given to improve the urban bus network and provide emergency strategies when traffic congestion occurs according to the numerical simulation results.展开更多
可重构测试平台(Reconfigurable Test Platform,RTP)是用来对机械手的关键性能指标(如定位精度、速度等)进行检验的设备,其成功应用依赖于网络联盟(NA)环境下机械模块资源的低成本、高质量及快速地获取。NA内RTP优化配置设计是指从联盟...可重构测试平台(Reconfigurable Test Platform,RTP)是用来对机械手的关键性能指标(如定位精度、速度等)进行检验的设备,其成功应用依赖于网络联盟(NA)环境下机械模块资源的低成本、高质量及快速地获取。NA内RTP优化配置设计是指从联盟内盟员企业中依据加工任务与机械模块的约束规则选择模块资源,从而形成RTP配置所需的机械模块组合路径集合,进而对该集合进行评估、优选的过程。首先对RTP配置问题进行定义与描述,建立了基于层次网络的RTP机械模块选择模型。提出了基于模块选择约束的可行的模块组合路径生成方法,及其联盟环境下模块资源的定性与定量相结合的评价指标的统一的量化方法,并依据各指标值对组合路径容量的影响将指标分为动态、静态两类指标,基于此提出了组合路径容量的计算方法,获得了RTP机械模块的p个较优的组合方案。最后用实例验证了方法的有效性与可行性。展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.61473073,61374178,61104074,and 61203329)the Fundamental Research Funds for the Central Universities(Grant Nos.N130417006,L1517004)the Program for Liaoning Excellent Talents in University(Grant No.LJQ2014028)
文摘In this paper, the invulnerability and cascade failures are discussed for the urban bus network. Firstly, three static models（bus stop network, bus transfer network, and bus line network） are used to analyse the structure and invulnerability of urban bus network in order to understand the features of bus network comprehensively. Secondly, a new way is proposed to study the invulnerability of urban bus network by modelling two layered networks, i.e., the bus stop-line network and the bus line-transfer network and then the interactions between different models are analysed. Finally, by modelling a new layered network which can reflect the dynamic passenger flows, the cascade failures are discussed. Then a new load redistribution method is proposed to study the robustness of dynamic traffic. In this paper, the bus network of Shenyang City which is one of the biggest cities in China, is taken as a simulation example. In addition, some suggestions are given to improve the urban bus network and provide emergency strategies when traffic congestion occurs according to the numerical simulation results.
文摘可重构测试平台(Reconfigurable Test Platform,RTP)是用来对机械手的关键性能指标(如定位精度、速度等)进行检验的设备,其成功应用依赖于网络联盟(NA)环境下机械模块资源的低成本、高质量及快速地获取。NA内RTP优化配置设计是指从联盟内盟员企业中依据加工任务与机械模块的约束规则选择模块资源,从而形成RTP配置所需的机械模块组合路径集合,进而对该集合进行评估、优选的过程。首先对RTP配置问题进行定义与描述,建立了基于层次网络的RTP机械模块选择模型。提出了基于模块选择约束的可行的模块组合路径生成方法,及其联盟环境下模块资源的定性与定量相结合的评价指标的统一的量化方法,并依据各指标值对组合路径容量的影响将指标分为动态、静态两类指标,基于此提出了组合路径容量的计算方法,获得了RTP机械模块的p个较优的组合方案。最后用实例验证了方法的有效性与可行性。
