Real-time traffic state estimation in urban corridors from heterogeneous data

In recent years, rapid advances in information technology have led to various data collection systems which are enriching the sources of empirical data for use in transport systems. Currently, traffic data are collected through various sensors including loop detectors, probe vehicles, cell-phones, Bluetooth, video cameras, remote sensing and public transport smart cards. It has been argued that combining the complementary information from multiple sources will generally result in better accuracy, increased robustness and reduced ambiguity. Despite the fact that there have been substantial advances in data assimilation techniques to reconstruct and predict the traffic state from multiple data sources, such methods are generally data-driven and do not fully utilize the power of traffic models. Furthermore, the existing methods are still limited to freeway networks and are not yet applicable in the urban context due to the enhanced complexity of the flow behavior. The main traffic phenomena on urban links are generally caused by the boundary conditions at intersections, un-signalized or signalized, at which the switching of the traffic lights and the turning maneuvers of the road users lead to shock-wave phenomena that propagate upstream of the intersections. This paper develops a new model-based methodology to build up a real-time traffic prediction model for arterial corridors using data from multiple sources, particularly from loop detectors and partial observations from Bluetooth and GPS devices.     

地铁车辆牵引电机装车噪声性能测试及分析

通过对某地铁车辆牵引电机开展线路振动噪声测试,获取了车辆运行过程中牵引电机本体附近及车辆内部的振动噪声数据,通过频域分析、品质分析和阶次分析等研究了不同工况下牵引电机的噪声性能及其对车底和车厢的影响,可为牵引电机设计开发提供参考。     

性别歧视在英语言语中的反映

本文在一些语言学家研究成果的基础上，结合作者本人的实际调查，从语义，词性，词序以及构词等方面进行分析，讨论了性别歧视在英语言语中的体现，同时，还对语言随社会的发展而演变，从而使性别歧视现象在言语中弱化的可能性做了深入探讨。     

异步电机的Γ型电路分析和改进型 U-N 模型设计简

文章分析了异步电机Γ型电路的数学模型、极点分布和反馈矩阵的设计,采用了全阶磁链观测器模型观测定/转子磁链,对比了全阶磁链观测器模型和U-N模型,并结合两者优点得到了定/转子磁链同步补偿的改进型U-N模型。Matlab仿真结果表明,改进型模型具有良好的精度和鲁棒性,可适应于各种高性能的电机控制平台。     

新型有轨电车交叉口一体化设计

新型有轨电车系统多采用地面敷设,交叉口是设计的关键节点,需要各专业密切配合,进行一体化设计。以广州海珠新型有轨电车试验段为例,从工程设计、交通工程设计、交通秩序管理和安全设施等方面提出目前交叉口设计中应注意的相关问题。在工程设计方面,需考虑线路与道路、轨道等各专业的协调配合,实现工程的合理可行性;在交通工程设计方面,以尽量减少对既有交通的影响为原则,综合考虑路口渠化、交通控制、交通组织等方案,提高路口的通行能力;在路口交通秩序管理和安全设施方面,应重点考虑人行过街设施、设置相应的标志标线等,保证交通的有序及安全。只有通过上述3个方面的系统化设计,才能实现交叉路口功能最优化。     

供应链订单任务分配模型及其混合遗传算法

建立了面向供应链的多产品、多订单、多时段的订单任务分配的混合整数线性规划模型.为缩短求解时间和避免大量非法染色体出现,设计了基于遗传算法和启发式规则相结合的混合遗传算法.通过算例比较了该算法和SAS软件的OR模块.结果表明,与SAS/OR模块相比,该算法最优解误差为2.3%,但计算运行时间仅为SAS/OR模块的0.89%.     

三阶奇摄动非线性边值问题解的唯一性

利用微分不等式理论，研究了三阶奇摄动非线性边值问题，以上下解为基础，建立了解的唯一性定理，在适当条件下，构造具体的上下解，得到了解的唯一性．结果表明这种技巧为奇摄动边值问题的唯一性研究提出了新的思路．     

A Note on Shor’s Quantum Algorithm

Introduction Factoring integers is generally thought to behard on a classical computer. But it is now heldthat prime factorization can be accomplished inpolynomial time on a quantum computer. This re-markable work is due to Shor[1]. For a given num-ber n, he gave a quantum computer algorithm forfinding the order r of an element x (mod n) insteadof giving a quantum computer algorithm for factor-ing n directly. The indirect algorithm is feasiblebecause factorization can be reduced to finding th…     

基于偏序结构相似度的多准则决策

针对决策者只能提供决策方案的序数偏好信息的多准则决策问题,提出了基于偏序之间相似度的多准则决策方法.该方法运用模糊相似关系确定相似度,通过计算控制指标和被控指标,分别得出方案集的两个预序排列,然后将这两个全预序排列合并成方案集的最后排列.该排列具有更符合现实决策行为的偏序结构.举例说明了该方法的可行性.     

Numerical research on wave-making resistance of trimaran

A 3D rankine panel method was developed for calculating the linear wave-making resistance of a tri-maran with Wigiey hulls. In order to calculate the normal vector and derivative of the body surface accurately,non-uniform rational B-spline (NURBS) was adopted to represent body surface and rankine source density.The radiation condition is satisfied using the numerical technology of staggered grids. Numerical results showthat the linear wave-making resistance of the trimaran can be calculated effectively using this method.