This work aimed to explore the switch tendency of bicycle use between cyclists and non-cyclists.The attitude based market segmentation approach was proposed to achieve the research objective.The filed investigations w...This work aimed to explore the switch tendency of bicycle use between cyclists and non-cyclists.The attitude based market segmentation approach was proposed to achieve the research objective.The filed investigations were conducted in Nanjing,China,to obtain travelers' actions and attitudes towards bicycle uses.The structural equation modeling(SEM) was used to identify the attitudinal factors indicating variables and to explore the interrelationships among them.The SEMs were developed separately for the cyclist group and the non-cyclist group.All respondents were clustered into eight distinct segments by six selected attitudinal factors.The mode switch tendency and attitude in each segment is different from others,indicating that different segments have particular policies or strategies to encourage cycling.Policy implications that best serve the potential bicycle users were discussed to reduce the number of cyclists who have high tendency to use other modes,and increase the possibility of using bicycle in the non-cyclists group with the moderate and high switch tendency.展开更多
当前,高频换流器实时仿真在仿真精度和仿真灵活性上难以兼顾。为此采用了基于FPGA+PC的实时多速率协同仿真方法,全面展示了多速率协同仿真系统的仿真原理,以及硬件设计与实现。在30 k Hz/50 k Hz三相两电平逆变算例仿真的研究中,呈现了...当前,高频换流器实时仿真在仿真精度和仿真灵活性上难以兼顾。为此采用了基于FPGA+PC的实时多速率协同仿真方法,全面展示了多速率协同仿真系统的仿真原理,以及硬件设计与实现。在30 k Hz/50 k Hz三相两电平逆变算例仿真的研究中,呈现了换流器建模、算例模型分割和电路求解器实现。以离线精确模型为基准,将多速率协同仿真平台与PC实时仿真平台的实验结果从仿真波形、仿真误差及实时性方面进行比较。结果表明,在开关频率50 k Hz以下多速率仿真的速率转换误差收敛,电磁暂态仿真欧式范数误差达到1%左右,仿真平台仿真步长达到500 ns。该方法提高了高频换流器实时仿真精度、减小了仿真步长,为高性能协同仿真平台的设计提供了参考。展开更多
基金Projects(51208256,51178157)supported by the National Natural Science Foundation of ChinaProject(2012-K5-13)supported by the Ministry of Housing and Urban-Rural Development of China
文摘This work aimed to explore the switch tendency of bicycle use between cyclists and non-cyclists.The attitude based market segmentation approach was proposed to achieve the research objective.The filed investigations were conducted in Nanjing,China,to obtain travelers' actions and attitudes towards bicycle uses.The structural equation modeling(SEM) was used to identify the attitudinal factors indicating variables and to explore the interrelationships among them.The SEMs were developed separately for the cyclist group and the non-cyclist group.All respondents were clustered into eight distinct segments by six selected attitudinal factors.The mode switch tendency and attitude in each segment is different from others,indicating that different segments have particular policies or strategies to encourage cycling.Policy implications that best serve the potential bicycle users were discussed to reduce the number of cyclists who have high tendency to use other modes,and increase the possibility of using bicycle in the non-cyclists group with the moderate and high switch tendency.
文摘当前,高频换流器实时仿真在仿真精度和仿真灵活性上难以兼顾。为此采用了基于FPGA+PC的实时多速率协同仿真方法,全面展示了多速率协同仿真系统的仿真原理,以及硬件设计与实现。在30 k Hz/50 k Hz三相两电平逆变算例仿真的研究中,呈现了换流器建模、算例模型分割和电路求解器实现。以离线精确模型为基准,将多速率协同仿真平台与PC实时仿真平台的实验结果从仿真波形、仿真误差及实时性方面进行比较。结果表明,在开关频率50 k Hz以下多速率仿真的速率转换误差收敛,电磁暂态仿真欧式范数误差达到1%左右,仿真平台仿真步长达到500 ns。该方法提高了高频换流器实时仿真精度、减小了仿真步长,为高性能协同仿真平台的设计提供了参考。
