Price of anarchy for non-atomic congestion games with stochastic demands

We generalize the notions of user equilibrium, system optimum and price of anarchy to non-atomic congestion games with stochastic demands. In this generalized model, we extend the two bounding methods from Roughgarden and Tardos (2004) and Correa et al. (2008) to bound the price of anarchy, and compare the upper bounds we have obtained. Our results show that the price of anarchy depends not only on the class of cost functions but also demand distributions and, to some extent, the network topology. The upper bounds are tight in some special cases, including the case of deterministic demands.     

船用交流电机基于DSP的软启动控制系统研究

交流电机在船舶上的应用非常广泛,但其启动冲击电流比较大,对电网和电机的冲击比较大,因此对电机启动控制的研究非常重要。本文分析介绍了软启动器的特点、用途和其在船舶上的应用,并根据软启动器的原理,利用DSP和晶闸管,设计了一个基于DSP控制的调速系统。通过控制晶闸管的导通角度和导通时间,来实现电机的平滑启动,以降低启动对电网和电机的冲击。最后对电机的软启动控制系统进行了分析。     

Quantifying the Difference Between Self-Reported and Global Positioning Systems-Measured Journey Durations: A Systematic Review

Accurate measurement of travel behaviour is vital for transport planning, modelling, public health epidemiology, and assessing the impact of travel interventions. Self-reported diaries and questionnaires are traditionally used as measurement tools; advances in Global Positioning Systems (GPS) technology allow for comparison. This review aimed to identify and report about studies comparing self-reported and GPS-measured journey durations. We systematically searched, appraised, and analysed published and unpublished articles from electronic databases, reference lists, bibliographies, and websites up to December 2012. Included studies used GPS and self-report to investigate trip duration. The average trip duration from each measure was compared and an aggregated, pooled estimate of the difference, weighted by number of trips, was calculated. We found 12 results from eight eligible studies. All studies showed self-reported journey times were greater than GPS-measured times. The difference between self-report and GPS times ranged from over-reporting of +2.2 to +13.5 minutes per journey. The aggregated, pooled estimate of the difference, weighted by number of trips, was over-report of +4.4 minutes (+28.6%). Studies comparing self-reported and GPS-measured journey duration have shown self-reported to be consistently over-reported across the study sample. Our findings suggest that when using self-reported journey behaviour, the journey durations should be treated as an over-estimation.     

智能交通在城市交通中的应用探讨

智能交通的研究课题是如何把现代的高科技与交通联系起来.结合实际阐述了智能交通系统在城市交通管理中的作用和重要性,针对我国交通现状提出了一些建议,并对智能交通未来的发展进行了探讨.     

海权性质、海权结构及海权系统

海权的性质是关于权利与权力的综合体,无论从排他性及共有性角度来考量,都有其学理、法律及历史上的意义．海权的结构可以从学理上来考量,更需要从现实角度来考量,甚至包括软海权与硬海权的关系．海权系统更为复杂,既存在整体与部分的关系,也存在层次性与结构性的关系、开放性与稳定性的关系、以及海权系统的目的性与自组织性的关系．     

有轨电车通信信号技术与智能交通系统

通信信号系统是指挥轨道交通行车、保证列车运行安全、提高运输效率、传递交通信息的重要设施。首先研究了有轨电车的运营基础,并结合通信信号系统归纳有轨电车的主要特点及通信信号系统关键技术。总结了国内外有轨电车通信信号系统的主要构成,重点介绍沈阳市浑南新区有轨电车通信信号系统概况。最后提出有轨电车智能交通系统的概念,并阐述其主要功能及系统构成。     

ITS与病体系统诊治

由于交通系统是一个复杂的巨系统,本文遵照钱学森院士原始的综合集成方法对城市交通系统进行研究, 结合集对分析、可拓学等新理论,提出病体交通系统及其诊治系统模型,并提出若干解决方法,最后介绍了一个具体的应用实例。     

车载控制器和列车管理系统接口监测系统设计

部分城市地铁车载设备由车载控制器（CC）和列车管理系统（TMS）组成.由于TMS常常显示CC通信状态误报警信息,给设备维护带来麻烦,容易延误设备维修时机.为此,提出一种监测地铁CC和TMS通信的监测系统,能实时监测并记录CC和TMS之间的通信信息,并且能够离线图形化解析监测数据,方便设备维护人员找出问题原因.该系统目前已成功应用,并取得了很好的效果.     

简介面向GIS数字测图的方法

GIS产业是现代测绘行业发展的必然趋势,而面向GIS的数字测图更是测绘行业的主要发展方向。文中主要介绍了3种与GIS紧密相关的数字测图的方法,通过分析比较得出它们的优缺点,以便为今后的工作提供更好的理论依据。     

发展中的铁路客户服务中心

对铁路客户服务中心的结构及最新关键技术进行介绍，从技术层面对应用中的客户服务中心的系统设计及功能进行论述，阐述了对客服系统如何进行运营管理，提高服务质量，并对铁路客户服务中心的前景进行了分析及建议。