Unsafe cycling behaviours and near crashes among Italian cyclists

This study investigates the direct and indirect effect of three types of unsafe behaviours (i.e. errors, generic violations and smartphone-specific violations) on the likelihood of near crashes and actual crashes among Italian cyclists. We considered smartphone-specific violations as a different unsafe behaviour subtype that enhances the probability of committing errors, thus increasing the likelihood of being involved in near crashes. Furthermore, we hypothesized that near crashes will predict actual crashes. Results revealed that errors predicted near crashes, whereas generic and smartphone-specific violations did not. Near crashes mediated the effect of errors on crashes. Moreover, smartphone-specific violations predicted crashes throughout its consecutive effects on errors and near crashes. These findings contribute to deepen our understanding of the relationship between cyclists’ unsafe behaviours, near crashes and actual crashes. To our knowledge, the present study is the first that links errors to near crashes among cyclists.     

Consumer decision-making of slow moving consumer goods in the age of multi-channels

Currently, consumer decision-making is influenced by the spread of technology that has made multi-channel retailing possible. Multi-channel retailing can be defined as a retailer using a combination of separate and independent channels without any overlap for promoting and selling products and services. This study contributes to three research streams: consumer decision-making, multi-channel retailing and slow-moving consumer goods (SMCG). A theoretical framework is developed to examine the decision-making processes of two groups of consumers, Millennials and Mothers. As the aim of the study was to gain insight into consumer decision-making in the context of multi-channels it was designed to be exploratory and used an abductive approach. The empirical material was mainly collected via interviews in store and consumers’ homes. The interview data are complemented by in-store observations. Our findings show that multi-channels influence consumers’ decision-making and that there are differences between Millennials and Mothers. Different devices and channels are used at different stages of the decision-making process and we claim that they complement, rather than conflict with each other. Retailers need to understand that customers expect omni-channelling, which has a positive impact on brand and sales. We argue that retailers who want to remain competitive will need to move toward omni-channelling.     

一种小波变换下的ADS-B信号增强算法

S模式的广播式自动相关监视技术（Automatic Dependent Surveillance-Broadcast,ADS-B）是目前空中交通管制大力推广的技术,但ADS-B信号在远距离传输过程中,由于传输信道的影响,会出现幅度减小和能量衰减等问题,从而导致接收到的微弱ADS-B信号不能正确译码。针对这种情况,提出用小波变换对信号做增强处理的方法,首先改进小波系数,接着确定分解层数,再利用重构指数来选取最优小波基,最后对阈值进行改进,考虑在不同的小波分解尺度上选取不同的阈值。对实际数据进行测试的结果表明,该算法能有效地对ADS-B信号进行增强,对信号强度为-94 dBm的微弱信号也能正确译码,译码准确率明显提高,对空中管理、空间安全等实际应用有一定意义。     

基于交通可达性的半岛型省区中心——门户体系比较分析

基于GIS平台,构建综合评价指标体系,对我国山东、辽宁两个典型半岛型省区2002年和2016年中心—门户体系进行比较分析,结果显示:①两省的可达性水平均实现了由"周末生活圈"向"一日生活圈"的转变,其中对内可达性格局呈现出以各自省会城市为核心向外围逐渐扩展的"中心—外围"格局,对外可达性格局辽宁省表现为双核型特征,山东省则呈现出由弱双核向单核结构发展的态势。②两省中心—门户体系差异化明显,存在由腹地城市转向门户城市、腹地中心与门户城市等级提升、减弱五种类型,其中山东省门户城市等级提升幅度强于腹地中心城市的衰减速度,而辽宁省中心与门户城市等级变化幅度不大。③两省中心—门户体系具有一定位序规模分布特征,在空间上呈帕累托分布模式,表现为首位城市的集聚效应过于突出,中小城市发展相对滞后。山东省门户城市的发展速度快于中心城市,其中心—门户体系向开放型的门户主导型转变。辽宁省由于门户与腹地城市发展差距较小,其中心—门户体系的双核特征愈加明显。两省经济、交通可达性等指标对中心—门户等级体系影响较大,区位中心性影响较小,山东省已经出现中心与门户城市合二为一的态势。     

城市交通拥堵的背景变换分析

运用背景变换分析方法分析了城市交通过度拥堵问题,从空间和时间角度进行了背景变换研究,提出解决城市交通过度拥堵问题需要从城市的良好发育及合理的空间扩展方面寻求答案.     

基于季节时间序列模型的民航客运需求预测分析

随着经济的不断发展,人们的生活水平不断提升,消费理念也有很大改变,民用航空运输业也获得了飞速发展,越来越多的人选用航空这一交通方式出行。文章主要介绍了季节时间序列模型,并使用1998年1月至2013年5月的月度数据建立SARIMA模型,并对2013年的民航客运量进行预测分析。通过使用SARIMA模型对我国民航客运量进行预测,以期对民航企业制定合理的运营决策提供一些参考。     

广西北部湾公路物流发展的问题和对策

广西北部湾公路物流发展迅速，但综合交通运输体系还没有建立，公路物流配套基础设施落后，管理技术和信息化水平低，公路运输企业经营方式落后，物流研究相对落后，物流专业人才短缺。必须抓住机遇，多方筹措资金，完善交通网络体系，建立港口集疏运系统，加快打造公路物流港；加大扶持力度，加强法制建设，增强服务意识，促进公路物流健康发展；大力发展第三方物流．加快车辆结构调整和构造公路物流信息平台，加强人才培养和引进。     

地质雷达在贵州公路建设岩溶勘探中的应用

岩溶对公路建设存在巨大的安全隐患,地质雷达方法对查明公路基础岩溶的深度和空间分布是一种有效的方法,对公路建设有重大作用。     

关于公共交通网络优化研究概要

本文旨在介绍我们关于公共交通网络优化研究的梗概。重点论述了数学模型建立和交通调查方法,并提出了一些设想,力图阐明自己的特色。