Socioeconomic factors affecting the job satisfaction levels of self-employed container truck drivers: a case study from Shanghai Port

The job satisfaction level (JSL) of self-employed container truck drivers (SCTDs) is vital to the container trucking industry’s (CTI) stability in China. An anonymous field survey of 645 SCTDs was conducted at Shanghai Port. Three ordered probit models were, respectively, developed to analyze the drivers’ JSLs, their attitudes, and reactions to a CTI downturn. This study contributes to the literature that the demographic variables were not statistically significant for the SCTDs’ current JSLs, while higher income SCTDs with fewer expenses were expected to have higher JSLs. During an industry downturn, drivers with families in Shanghai showed more job dissatisfaction. More working hours, lower income, expensive diesel fuel, a high consumer price index (CPI), and a low freight-to-distance ratio (FDR) significantly lowered the JSLs. An increase in the price of diesel fuel and the CPI, and a lower FDR exposed the industry to risk and instability. Additionally, credible evidence indicated that as the dissatisfaction levels of SCTDs rise in a downturn, SCTDs implement more practical measures that may negatively affect the industry’s stability as well as society’s. Based on these findings, managerial or policy implications were proposed to efficiently improve SCTDs’ JSLs and CTI stability in Shanghai.     

The interactions between online shopping and personal activity travel behavior: an analysis with a GPS-based activity travel diary

Accompanying the widespread use of the Internet, the popularity of e-commerce is growing in developing countries such as China. Online shopping has significant effects on in-store shopping and on other personal activity travel behavior such as leisure activities and trip chaining behavior. Using data collected from a GPS-based activity travel diary in the Shangdi area of Beijing, this paper investigates the relationships between online shopping, in-store shopping and other dimensions of activity travel behavior using a structural equation modelling framework. Our results show that online buying frequency has positive effects on the frequencies of both in-store shopping and online searching, and in-store shopping frequency positively affects the frequency of online searching. Frequent online purchasers tend to shop in stores on weekends rather than weekdays. We also found a negative effect of online buying on the frequency of leisure activities, indicating that online shopping may reduce out-of-home leisure trips.     

论20年来交通法学研究方法之特征与流变 ——多元研究范式的学术史考察

20年来,随着规范法学对交通现实问题回应愈发疲软,交通法学经历了从法教义学的闭环到法社会学的交叉研究的范式变迁.管理学的理论供给引领交通治理模式升级转型,社会协同治理、"大交通"执法模式应运而生.信息技术、医学、微电子学、环境学等自然科学研究方法从立法需求面向的碎片化摘取,走向交通法学研究方法论层面的全面进驻.心理学、...     

海文高速公路路面损坏原因分析及修复方案

通过对海文高速公路路面损坏现场调查及试验检测,分析其主要的破坏原因,提出了比较合理的修复措施。     

基于Z域软件锁相环建模及参数设计

准确的相位信息对大部分现代电能变换装置的稳定运行至关重要。软件锁相环（SPLL）具有设计自由、适应性强等优点可快速准确获得电网电压的相位和频率信息。本文通过分析SPLL原理,获得Z域SPLL线性化模型,进而分析了SPLL线性化模型的稳定性和误差,并在Z域下设计SPLL控制器参数,最后,针对两种电网电压相位跳变情形进行仿真验证。仿真结果表明该设计方法的正确性。     

低压直流用定子双绕组感应发电系统的仿真研究

本文建立了带整流桥负载的双绕组感应发电机在静止坐标系下的动态数学模型,利用控制绕组定子电压定向的控制策略对低压大电流的双绕组感应发电机系统进行了变速条件下动态特性的仿真研究,结果表明系统有良好的稳压性能。     

关于船舶安全试航的思考

从船舶试航活动的特点以及对试航活动中存在的人为安全隐患进行深入分析,提出建立试航安全管理制度、加强试航操作培训、加强试航安全监管、加强法制建设、完善试航制度等船舶安全适航的对策和建议。     

后危机下中国集装箱班轮市场面临的新机遇和新挑战

分析金融危机以后中国集装箱班轮市场的特征,研究其面临行业政策调控、市场结构调整所带来的挑战,并提出中国集装箱班轮企业市场在后危机时代将会出现航运产业向亚洲转移、国内拉动内需政策的刺激等诸多机遇,总结出中国集装箱班轮企业只有练好内功,努力把握各种机遇,才能争取危机过后的更好更快发展。     

高频地波雷达发展动向与分析

高频地波雷达在海洋领域发挥着不可替代的作用。文章分析了高频地波雷达的发展动向。     

编队水声探测时抗同频干扰的空间分集法研究

编队水声探测是对潜搜索的常用手段和有效途径,同频干扰是编队水声探测时主动声纳的主要干扰之一。在对同频干扰分类研究的基础上,对几种常用的同频干扰抑制方法进行了研究和总结,并给出了空间分集法的实现方法以及抗同频干扰的效果。同时,通过两种编队队形对空间分集法的性能做了仿真分析。