舰艇通信与电子系统一体化集成技术研究

舰艇电子信息系统正在向“一体化结构”演变,舰艇电子信息系统一体化集成是国内外十分关注的重大课题。在分析舰艇电子信息系统结构演变方向基础上,重点研究舰艇通信作战使用特点,分析通信与其它电子信息系统实现一体化集成的必要性和可行性,探讨通信系统集成发展趋势、发展阶段和目标,概要分析相关的核心技术。     

A traffic analysis zone definition: a new methodology and algorithm

This paper develops a comprehensive approach to the definition of transportation analysis zones (TAZ), and therein, presents a new methodology and algorithm for the definition of TAZ embedded in geographic information systems software, improves the base algorithm with several local algorithms, and comprehensively analyses the obtained results. The results obtained are then compared to these presently used in the transportation analysis process of the Lisbon Metropolitan Area. The proposed algorithm presents a new methodology for TAZ design based on a smoothed density surface of geocoded travel demand data. The algorithm aims to minimise the loss of information when moving from a continuous representation of the origin and destination of each trip to their discrete representations through zones, and focuses on the trade-off between the statistical precision, geographical error, and the percentage of intra-zonal trips of the resulting OD matrix. The results for the Lisbon Metropolitan Area case study suggest a significant improvement in OD matrix estimates compared to current transportation analysis practises based on administrative units.

连续刚构桥健康监测数据的采集和处理

文章根据连续刚构桥的构造和受力特点,介绍了某连续刚构桥健康监测系统的数据采集方式和定时采集制度,同时对应力、挠度和加速度数据的后期处理方法进行了探讨,为其他同类桥梁的健康监测提供依据。     

Passenger travel characteristics and bus operational states: a study based on IC card and GPS data in Yinchuan,China

ABSTRACT

In recent years, public transport has been developing rapidly and producing large amounts of traffic data. Emerging big data-mining techniques enable the application of these data in a variety of ways. This study uses bus intelligent card (IC card) data and global positioning system (GPS) data to estimate passenger boarding and alighting stations. First, an estimation model for boarding stations is introduced to determine passenger boarding stations. Then, the authors propose an innovative uplink and downlink information identification model (UDI) to generate information for estimating alighting stations. Subsequently, the estimation model for the alighting stations is introduced. In addition, a transfer station identification model is also developed to determine transfer stations. These models are applied to Yinchuan, China to analyze passenger flow characteristics and bus operations. The authors obtain passenger flows based on stations (stops), bus lines, and traffic analysis zones (TAZ) during weekdays and weekends. Moreover, average bus operational speeds are obtained. These findings can be used in bus network planning and optimization as well as bus operation scheduling.     

Freeway drivers’ willingness-to-pay for a distance-based toll rate

This paper applies the contingent valuation method to investigate and estimate the toll rate that freeway drivers are willing-to-pay (WTP) for each unit of distance they travel, after switching from per-entry based to distance-based tolling system. Due to a large portion of respondents who are unwilling to pay a toll at all, we adopt the spike model to avoid estimation errors. The estimation results show that average willingness to pay toll is TWD¹ 0.86/km, which can be refined further to TWD 0.81/km for short distance travelers, TWD 0.93/km for medium distance travelers, and TWD 0.97/km for long distance travelers. Additionally, the WTP toll rate of short distance travelers is significantly different on public holidays but not during peak hours. In contrast, the WTP toll rates of medium and long distance travelers significantly different during peak hours but not on public holidays.     

An analysis of the factors influencing differences in survey-reported and GPS-recorded trips

Recent advances in global positioning systems (GPS) technology have resulted in a transition in household travel survey methods to test the use of GPS units to record travel details, followed by the application of an algorithm to both identify trips and impute trip purpose, typically supplemented with some level of respondent confirmation via prompted-recall surveys. As the research community evaluates this new approach to potentially replace the traditional survey-reported collection method, it is important to consider how well the GPS-recorded and algorithm-imputed details capture trip details and whether the traditional survey-reported collection method may be preferred with regards to some types of travel. This paper considers two measures of travel intensity (survey-reported and GPS-recorded) for two trip purposes (work and non-work) as dependent variables in a joint ordered response model. The empirical analysis uses a sample from the full-study of the 2009 Indianapolis regional household travel survey. Individuals in this sample provided diary details about their travel survey day as well as carried wearable GPS units for the same 24-h period. The empirical results provide important insights regarding differences in measures of travel intensities related to the two different data collection modes (diary and GPS). The results suggest that more research is needed in the development of workplace identification algorithms, that GPS should continue to be used alongside rather than in lieu of the traditional diary approach, and that assignment of individuals to the GPS or diary survey approach should consider demographics and other characteristics.     

对我国高速公路实行计重收费的思考

通过车型分类和计重收费两种收费方式的比较,从而为车辆超限超载问题的解决提供参考。     

港航物流企业信息系统体系结构的研究

随着港航物流企业信息系统研究的不断深入,企业信息系统的建设也就显得越来越重要。在分析国内外港航物流企业信息系统基础上,提出港航物流企业信息系统设计目标,最后采用BPS的思想来构建港航物流企业管理信息系统的体系结构。     

电子信息与智能化技术在汽车上的应用

阐述了电子控制技术与信息技术在汽车中的应用,重点介绍了电子与信息技术在汽车信息化、智能化、网络控制化中的应用与发展趋势.指明信息技术与网络技术应用于汽车,是信息社会发展的必然,是信息社会与智能化社会生活的必然需求.     

连云港市某核算单元污水集中收集处理率影响因素分析

以连云港市大浦污水处理厂为例,提出现状梳理、问题分析、解决方案、组织实施的工作思路。基于“源-网-厂-河”系统思维,由河道-污水处理厂-泵站-管网-排水户逐级溯源,对各污水收集系统进行分析,重点探究低效能片区形成的原因,精准施策,达到区域污水集中收集处理率明显提高,且污染物削减率大幅提升的目的。