This paper aims to estimate segments of latent variables associated with mode choice. The estimates of latent segmentation is obtained through Structural Equation Modelling (SEM) approach. The model is used to identif...This paper aims to estimate segments of latent variables associated with mode choice. The estimates of latent segmentation is obtained through Structural Equation Modelling (SEM) approach. The model is used to identify segments of homogeneous latent variables for attitude towards choice of feeder modes. The Scholars from different nations have contributed greatly in identifying conventional factors affecting the mode choice behavior. Apparently, very few studies have focused on analyzing latent variables affecting the choice of a mode. Specifically, feeder modes, which are likely to increase the mode shift to the public transport mode through improved door- bus stop connectivity. Thus, this study was carried out with an aim to identify the effect of latent variables on the mode choice behavior of the riders for proposed feeder modes. The proposed modes are Environment-Friendly for added benefits of pollution control. The selected study area is the city of Vadodara, in Gujarat state of India. For this, 41 latent variables were identified from the literature review. Data was collected through a predetermined and framed questionnaire. The latent variables with their indicators were checked by preliminary Confirmatory Factor Analysis (CFA), using SPSS software. Six hypotheses were framed to determine the interrelationship between the latent variables through Structural Equation Modelling (SEM) using the Analysis of Moment Structures (AMOS) software. Based on the outliers, communalities extraction and, correlation criteria, the indicators were reduced to 26. The results of the segmental analysis model reveal that the four framed latent variables positively affect the mode choice behavior of a rider. Hence, inculcating these latent variables while proposing an Environment-Friendly feeder mode may result in increased mode choice. Which can be predicted through choice models as a future scope.展开更多
This paper aims to provide a decision-making method for the transportation management strategies in guiding the transformation of trip mode choice during planned special events. The Expo 2010 Shanghai is taken as an e...This paper aims to provide a decision-making method for the transportation management strategies in guiding the transformation of trip mode choice during planned special events. The Expo 2010 Shanghai is taken as an example, and a structural equation model is employed to analyze the dynamic mechanism of trip mode choice behavior and the effectiveness of the transportation management measures at different stages. Based on the difference between the objective-oriented stated preference （SP） survey results and the objectives, together with the feedback from the previous stage survey, some adjustments on the transportation management measures are made in the next stage of the planning process until the objectives are eventually achieved. The results indicate that the adjustments on transportation management measures at different stages can effectively raise the transit share to 88.6%. Nonlocal visitors are inclined to choose nonstop modes of transportation and the companion attributes have the most significant effects on the trip mode choices of visitors. The research method is proved to be an effective way to support the decision making process of transportation management measures during planned special events in the future.展开更多
This paper is devoted to study the application of the decentralized sliding mode control method, which is used to reduce the vibration of large spacecraft flexible appendage. In the process of control design, the slid...This paper is devoted to study the application of the decentralized sliding mode control method, which is used to reduce the vibration of large spacecraft flexible appendage. In the process of control design, the sliding surface of sliding mode control is determined by minimizing the optimal cost function, and the controller is the saturation controller. The controlled structure is subject to arbitrary, unmeasurable and uncertainty disturbance forces and initial displacement. The decentralized control method and the centralized control method are used to control vibration of the structure respectively. When the system is subjected to the initial displacement or external disturbance, the computer simulation shows that both of these control methods perform effectively, but the number of Riccati equation of the decentralized method is far smaller than that of centralized control method, especially in a large system.展开更多
为提升开关电源设计效率和性能,针对普通设计者难以全面考虑各因素对电源性能影响的问题,提出基于因果推断与知识图谱的开关电源设计辅助方法.首先,以电感磁芯材料对电源性能影响为例,通过仿真与实物实验收集数据.然后,引入线性回归方...为提升开关电源设计效率和性能,针对普通设计者难以全面考虑各因素对电源性能影响的问题,提出基于因果推断与知识图谱的开关电源设计辅助方法.首先,以电感磁芯材料对电源性能影响为例,通过仿真与实物实验收集数据.然后,引入线性回归方法分析电感磁芯材料对电源性能的影响关系,并采用PC(Peter and Clack)算法挖掘电感磁芯材料与电源性能间还未明确的因果关系.接着,采用结构方程模型计算电感磁芯材料对电源性能的因果效应.引入知识图谱技术,构建含因果关系的电源知识图谱,为电源优化设计提供新视角并提升智能化水平.最后,通过案例分析验证了所提方法在电源设计中的有效性.展开更多
技术的发展推动了传统产业与互联网的结合,创造了一种全新的移动互联网商业模式O2O(online to offline)。O2O模式融合了实体店和线上商城经营的诸多优点,成为一个营销模式创新的范式。感知收益-感知风险框架是消费行为研究的一个主流框...技术的发展推动了传统产业与互联网的结合,创造了一种全新的移动互联网商业模式O2O(online to offline)。O2O模式融合了实体店和线上商城经营的诸多优点,成为一个营销模式创新的范式。感知收益-感知风险框架是消费行为研究的一个主流框架。基于这一框架,本文给出了O2O模式下生鲜农产品购买意愿的理论框架并提出了一系列假设。实证结果表明:总体态度对感知收益有正面影响,总体态度对感知风险有负面影响;信任对感知收益有正面影响,信任对感知风险有负面影响;感知收益对购买意愿有正面影响;感知风险对购买意愿有负面影响。展开更多
目的探讨肾移植患者应对方式、社会支持与抑郁情绪的关系。方法采用方便抽样方法,应用医学应对问卷(medical coping modes questionnaire,MCMQ)、社会支持量表(social support rating scale,SSRS)和自评抑郁量表(self-rating depression...目的探讨肾移植患者应对方式、社会支持与抑郁情绪的关系。方法采用方便抽样方法,应用医学应对问卷(medical coping modes questionnaire,MCMQ)、社会支持量表(social support rating scale,SSRS)和自评抑郁量表(self-rating depression dcale,SDS)对123名肾移植患者进行测评,然后用结构方程模型分析软件Amos(analysis of moment structures)7.0进行分析。结果肾移植患者应对方式中,面对维度得分为(20.9±3.6)分、回避维度得分为(17.2±2.7)分、屈服维度得分为(9.5±2.7)分;社会支持总分为(42.9±8.5)分,其中主观支持为(25.3±5.3)分、客观支持为(10.3±3.9)分,对支持的利用度得分为(7.3±2.0)分;SDS评分为(38.1±7.2)分。结构方程模型分析结果显示:面对维度对社会支持有直接(正向)效应(β=0.285,P<0.01);屈服维度对社会支持有直接(负向)效应(β=-0.376,P<0.01),屈服维度对抑郁有直接(正向)效应(β=0.321,P<0.01);而社会支持对抑郁有直接(负向)效应(β=-0.294,P<0.01);屈服维度还可通过社会支持间接影响抑郁。结论应对方式对肾移植患者的抑郁情绪有直接效应和间接效应;社会支持作为中介变量(mediated variable)调节应对方式与肾移植患者抑郁情绪的关系。展开更多
文摘This paper aims to estimate segments of latent variables associated with mode choice. The estimates of latent segmentation is obtained through Structural Equation Modelling (SEM) approach. The model is used to identify segments of homogeneous latent variables for attitude towards choice of feeder modes. The Scholars from different nations have contributed greatly in identifying conventional factors affecting the mode choice behavior. Apparently, very few studies have focused on analyzing latent variables affecting the choice of a mode. Specifically, feeder modes, which are likely to increase the mode shift to the public transport mode through improved door- bus stop connectivity. Thus, this study was carried out with an aim to identify the effect of latent variables on the mode choice behavior of the riders for proposed feeder modes. The proposed modes are Environment-Friendly for added benefits of pollution control. The selected study area is the city of Vadodara, in Gujarat state of India. For this, 41 latent variables were identified from the literature review. Data was collected through a predetermined and framed questionnaire. The latent variables with their indicators were checked by preliminary Confirmatory Factor Analysis (CFA), using SPSS software. Six hypotheses were framed to determine the interrelationship between the latent variables through Structural Equation Modelling (SEM) using the Analysis of Moment Structures (AMOS) software. Based on the outliers, communalities extraction and, correlation criteria, the indicators were reduced to 26. The results of the segmental analysis model reveal that the four framed latent variables positively affect the mode choice behavior of a rider. Hence, inculcating these latent variables while proposing an Environment-Friendly feeder mode may result in increased mode choice. Which can be predicted through choice models as a future scope.
基金The National Natural Science Foundation of China(No.51278363)
文摘This paper aims to provide a decision-making method for the transportation management strategies in guiding the transformation of trip mode choice during planned special events. The Expo 2010 Shanghai is taken as an example, and a structural equation model is employed to analyze the dynamic mechanism of trip mode choice behavior and the effectiveness of the transportation management measures at different stages. Based on the difference between the objective-oriented stated preference （SP） survey results and the objectives, together with the feedback from the previous stage survey, some adjustments on the transportation management measures are made in the next stage of the planning process until the objectives are eventually achieved. The results indicate that the adjustments on transportation management measures at different stages can effectively raise the transit share to 88.6%. Nonlocal visitors are inclined to choose nonstop modes of transportation and the companion attributes have the most significant effects on the trip mode choices of visitors. The research method is proved to be an effective way to support the decision making process of transportation management measures during planned special events in the future.
文摘This paper is devoted to study the application of the decentralized sliding mode control method, which is used to reduce the vibration of large spacecraft flexible appendage. In the process of control design, the sliding surface of sliding mode control is determined by minimizing the optimal cost function, and the controller is the saturation controller. The controlled structure is subject to arbitrary, unmeasurable and uncertainty disturbance forces and initial displacement. The decentralized control method and the centralized control method are used to control vibration of the structure respectively. When the system is subjected to the initial displacement or external disturbance, the computer simulation shows that both of these control methods perform effectively, but the number of Riccati equation of the decentralized method is far smaller than that of centralized control method, especially in a large system.
文摘为提升开关电源设计效率和性能,针对普通设计者难以全面考虑各因素对电源性能影响的问题,提出基于因果推断与知识图谱的开关电源设计辅助方法.首先,以电感磁芯材料对电源性能影响为例,通过仿真与实物实验收集数据.然后,引入线性回归方法分析电感磁芯材料对电源性能的影响关系,并采用PC(Peter and Clack)算法挖掘电感磁芯材料与电源性能间还未明确的因果关系.接着,采用结构方程模型计算电感磁芯材料对电源性能的因果效应.引入知识图谱技术,构建含因果关系的电源知识图谱,为电源优化设计提供新视角并提升智能化水平.最后,通过案例分析验证了所提方法在电源设计中的有效性.
文摘技术的发展推动了传统产业与互联网的结合,创造了一种全新的移动互联网商业模式O2O(online to offline)。O2O模式融合了实体店和线上商城经营的诸多优点,成为一个营销模式创新的范式。感知收益-感知风险框架是消费行为研究的一个主流框架。基于这一框架,本文给出了O2O模式下生鲜农产品购买意愿的理论框架并提出了一系列假设。实证结果表明:总体态度对感知收益有正面影响,总体态度对感知风险有负面影响;信任对感知收益有正面影响,信任对感知风险有负面影响;感知收益对购买意愿有正面影响;感知风险对购买意愿有负面影响。
文摘目的探讨肾移植患者应对方式、社会支持与抑郁情绪的关系。方法采用方便抽样方法,应用医学应对问卷(medical coping modes questionnaire,MCMQ)、社会支持量表(social support rating scale,SSRS)和自评抑郁量表(self-rating depression dcale,SDS)对123名肾移植患者进行测评,然后用结构方程模型分析软件Amos(analysis of moment structures)7.0进行分析。结果肾移植患者应对方式中,面对维度得分为(20.9±3.6)分、回避维度得分为(17.2±2.7)分、屈服维度得分为(9.5±2.7)分;社会支持总分为(42.9±8.5)分,其中主观支持为(25.3±5.3)分、客观支持为(10.3±3.9)分,对支持的利用度得分为(7.3±2.0)分;SDS评分为(38.1±7.2)分。结构方程模型分析结果显示:面对维度对社会支持有直接(正向)效应(β=0.285,P<0.01);屈服维度对社会支持有直接(负向)效应(β=-0.376,P<0.01),屈服维度对抑郁有直接(正向)效应(β=0.321,P<0.01);而社会支持对抑郁有直接(负向)效应(β=-0.294,P<0.01);屈服维度还可通过社会支持间接影响抑郁。结论应对方式对肾移植患者的抑郁情绪有直接效应和间接效应;社会支持作为中介变量(mediated variable)调节应对方式与肾移植患者抑郁情绪的关系。
