基于抖音平台开展汽车营销课程改革与探索

2020年,在新冠疫情全球持续蔓延的背景下,面对汽车销量近年的持续下滑,汽车厂家和经销商都积极地在互联网与新媒体上进行各种汽车营销活动。为了使职业院校汽车营销专业的课程内容与企业需求更为贴合,文章以抖音短视频平台中的汽车营销模式为例,探索汽车营销的课程改革,为职业院校汽车营销专业的师生提供借鉴。     

汽车ACC毫米波雷达和视觉传感器目标级融合方法研究

自适应巡航控制系统是实现未来智能化汽车辅助驾驶的重要功能之一,以往该系统主要采用毫米波雷达感知周围环境,但是容易出现较多的误识别和漏识别情况。针对现存的问题,文章研究了自适应巡航感知系统,不同于以往单一雷达的方案,本设计采用毫米波雷达和视觉传感器融合的办法改善感知系统的性能。通过搭建电动车传感器数据采集系统,编写CAN通信报文解析程序,分析毫米波雷达和视觉传感器特性等,完成了对雷达和视觉信号的采集及处理,实现了感知系统目标级融合。并在巡航和跟车工况下进行离线仿真,验证了目标级融合方案能够有效地提高感知系统的准确性和合理性。     

电辅助驱动技术研究

文章提供一种第二轴采用传统驱动桥作为主驱动、第三轴采用电驱动桥作为辅助驱动的驱动力复合并联混合动力三轴车型方案,结合提升轴空气悬架控制技术,该方案在运营经济性方面比传统双后轴驱动车型更优。     

一种基于蚁群算法的服务组合方法

Web服务是一种新型的信息集成架构,将多个Web服务组合成一个能完成复杂任务的组合技术是Web服务中关键技术之一．文中提出了一种基于蚁群算法的服务组合方法,对于服务序列可生成全局最优联盟,同时算法基于蚁群系统的学习能力可以有效减少联盟生成的搜索时间和计算量,可实现性好．     

快速城市化地区公交规划方法研究

目前中国许多地区进入快速城市化发展阶段,在长期城乡二元格局影响下,这些地区形成独特的公交需求特性.本文研究了快速城市化地区社会经济发展特性和公交统筹发展要求.根据公交线路服务特性将公交线路分为城乡公交线路和城区公交线路两类,提出了基于层次分析的快速城市化地区公共交通线网规划方法.通过张家港市公交规划的实例分析,体现出该方法适应地区发展趋势以及城乡统筹发展的战略要求.     

新交通轨道工程承轨槽施工技术

天津开发区新交通导向轨工程中，承轨槽的施工是整个工程的一道关键工序，其施工质量直接影响到导向轨的定位精度、环氧树脂的粘接强度及整个工程的施工效果。主要介绍了承轨槽的施工方案、施工工艺及其验收，以供参考。     

Estimating the value of risk reductions for car drivers when pedestrians are involved: a case study in Spain

We estimated the benefits associated with reducing fatal and severe injuries from traffic accidents using a stated choice experiment where choice situations were generated through a statistically efficient design. Specifically, the risk variables were defined as the expected annual number of vehicle car-users that suffered their death or were severely injured in a traffic accident. In addition, and differing from previous research, the number of pedestrians that died or were severely injured in traffic accidents per year was also included as a risk attribute in the choice experiment, to attempt at measuring drivers’ willingness to pay to reduce the risk of hitting pedestrians in a crash. The empirical setting was a choice of route for a particular trip that a sample of car drivers periodically undertakes in Tenerife, Spain. Models were estimated accounting for random taste heterogeneity and pseudo-panel data correlation. The median of the distribution of simulated parameters was used to obtain a representative measure for the monetary valuation of risk reductions. We found that the ratio between the values of reducing the risk of suffering a serious injury and that of reducing a fatality was approximately 18 %. Further, and quite novel, we also found that the value of reducing a pedestrian fatality was 39 % of the value of reducing a car occupant fatality.     

Users’ perceptions and willingness to pay in interurban toll roads: identifying differences across regions from a nationwide survey in Spain

Users’ acceptability is considered one of the key drivers for the successful implementation of transport policy measures. This is especially crucial in the case of toll roads since they are financed through drivers’ contributions. Previous literature in this field has mainly focused on measuring users’ attitudes towards urban congestion pricing strategies. However limited research has been developed concerning interurban toll roads. Previous research shows that socioeconomic variables are not conclusive to explain users’ perceptions towards tolls. By contrast, other drivers such as regional differences seem to play a more important role, especially when charging conditions within the same nation greatly vary across regions. This paper analyzes regional differences in users’ attitudes within an asymmetrical distribution of the toll road network across regions. Based on a nationwide survey conducted to road users in interurban toll roads in Spain, we develop both a binomial logit and a censored regression (tobit) model to explore drivers’ perceptions and willingness to pay. The research concludes that users from regions with a more extensive tolled network generally show a more negative attitude towards charges, but not necessarily a lower willingness to pay. The paper also points out that an asymmetrical distribution of toll roads across regions may result in negative perceptions among those users perceiving to be unfairly treated when compared to citizens in other regions.     

Drivers of transit service loyalty considering heterogeneity between user segments

Users’ loyalty to public transit service is fundamental to promote its popularity in the transportation market. A four-step analytical framework is advanced to investigate the importance of service attributes that heterogeneous transit user segments place on their public transit service loyalty, measured in terms of overall satisfaction and re-use intention. Critical service attributes perceived by transit users that are relevant for loyalty enhancement are explicitly determined, which vary between user segments. It is suggested that the design of strategies aimed to promote the use of public transit by increasing user loyalty towards transit service be targeted at specific attributes that contribute most to loyalty and specific user segments whose original loyalty level is significantly different to others.     

基于二值HT的多LFM信号检测

Wigner-Ville分布对于单分量LFM信号有很好的时频聚集性,但WVD是二次型变换,故对信号环境中复杂的多LFM信号不可避免的存在交叉项的干扰。HT可以消除交叉项的影响,能够很好的对多个LFM信号进行检测,但存在大信号淹没小信号的现象。提出二值HT能够很好的解决上述问题,为多LFM信号的检测技术提供理论依据。