物联网感知技术在航运业中的应用

在现代海上航运业务中,基于物联网的应用越来越多,如海上气象数据传输系统﹑海上雷达探测系统﹑目标物检测跟踪系统等。在这些业务中,核心的处理是对目标数据的采集及传输。海上无线通信的信道频谱较窄,如何在海上物联网体系中能对目标数据精确采集及有效传输事关整个应用业务的性能。本文着重研究海上物联网系统在感知层面的技术,利用分簇理论改进无线传感网络的路由技术,提出一种改进后的无线传感网络结构,最后对算法进行仿真。     

城市交通状况的模糊聚类分析

通过调查国内部分城市及地区的基础数据,建立了城市交通状况的评价指标体系,并利用系统工程的方法———模糊聚类分析模型,对国内的部分城市及地区进行聚类,从而评价出各个城市及地区的交通状况,结果认为,城市交通基础设施不足是制约交通发展的重要因素,只有改善城市交通状况,整治或根除城市交通问题,才能推动城市发展.     

日本东京湾港口群的主要港口职能分工及启示

由于日本东京湾内港口群职能分工合理,使得狭小的港湾内云集了6个世界级的大型港口,而港口间不但没有形成恶性竞争,反而取得了良好的增长业绩。通过对其职能分工经验进行分析,结合我国环渤海各主要港口的基础与优势,从而提出环渤海各主要港口的职能分工的构想。     

Bus ride times of exceptional school children

This paper examines bus ride times of exceptional school children in North Carolina. It uses levels of service data, which show excessive ride times for exceptional school children, to form clusters of local education agencies. From these clusters short term objectives or standards for maximum ride times are determined for each cluster. Among the findings are three distinct clusters of local education agencies (clusters 1, 2 and 3) whose maximum ride times are respectively 170 minutes, 105 minutes and 62 minutes.

The maximum ride times show that only one cluster (cluster 3) provides a service whose maximum ride time is comparable to the ideal maximum ride time (long term objective) of one hour revealed by the literature and also by responses of school superintendents and transportation directors. Methods of achieving these standards are examined. A comparison of the levels of service of regular and exceptional children transportation is also provided.

     

Trends and Opportunities for the Long-Term Development of Rotterdam's Port Complex

This article presents an overview of trends relevant for the long-term development of Rotterdam's port complex and resulting opportunities for this complex. These trends resulted from a literature review and conversations with 20 professors in fields relevant for port development. Nine trends that can be expected to become increasingly important in the next decades are discussed. These trends include the rise of manufacturing and logistics platforms, higher land efficiency, increasingly mixed land use in port areas, and rising importance of a “regional innovation system” in ports. Opportunities and concerns for the port of Rotterdam resulting from the trends are discussed.     

基于眼动参数的驾驶员标志视认行为研究

通过驾驶员佩戴眼动仪在模拟舱中进行动态标志视认仿真实验,获得不同车速下驾驶员视认交通标志时的注视次数和注视时间.采用动态聚类方法将驾驶员的视野平面划分成3个区域,并统计分析各区域的眼动参数规律:驾驶员的注视点分布与车速及信息量的变化呈现高度的相关性,随着车速的提高以及信息量的增多,落在标志区域的注视次数和注视时间占总数...     

Driver's Visual Cognition Behaviors of Traffic Signs Based on Eye Movement Parameters

A dynamic visual cognition experiment was carried out in driving simulation barn with eye tracker system to get drivers' eye movement parameters when they were reading traffic signs with various information quantities in different speeds. The eye movement parameters include fixation number and duration. Driver's visual area was divided into three areas using dynamic cluster method. Further analysis was conducted on the eye movement parameters of the three areas. Findings were discussed in this paper: the fixation distribution has a high correlation with driving speed and information quantity. As the driving speed and information quantity increased, the fixation number and duration in traffic sign area have an increasing trend and drivers have less visual cognition to front lane. When the guide signs have more than five amount of information, drivers' fixation number and duration have an abrupt change and the effectiveness of visual cognition decreased significantly. It is recommended that the highway traffic guide sign information volume should not exceed 5. Under the same condition, the driver needs more fixation when recognizing non-guide signs and the visual cognition process is more complicated.     

江苏船舶配套业发展现状与对策分析

近些年来,随着江苏造船业的快速发展,船舶配套业发展相对滞后,制约了江苏船舶工业的进一步发展。加快发展江苏船舶配套业是一项迫切而艰巨的任务。本文通过对江苏船舶配套业发展现状的研究分析,从优势地区、优势企业、优势产品以及优势技术四个方面阐述了江苏船舶配套业发展思路;并结合产业集群相关理论提出了江苏船舶配套业的发展对策。     

基于区域造船的舰船内部通信系统分区设计

分析传统造船模式下舰船内部通信系统设计现状,研究区域造船模式下舰船内部通信系统设计与区域造船要求的匹配问题。在舰船内部通信系统设计中采用分区设计方法,并考虑用综合集成的思路将舰船内部离散的各类内通设备集成为综合内通终端,使舰船内部通信系统设计适应区域造船要求。     

基于聚类分析理论确定广梧高速公路高液限土改良方案

针对广梧高速公路高液限土的不良特性,进行了一系列室内试验,测试土样的物理力学指标;借助聚类分析理论,对样本土样进行分类,并确定各类的属性特征值和改良方案;根据土样与属性特征值的相关距离确定各类土样的改良试验项目。以新土料改良方案确定过程为例,介绍了研究结论的使用过程。