基于自适应神经模糊推理系统的平行泊车路径规划

针对常见的平行泊车场景,提出一种基于自适应神经模糊推理系统的平行泊车路径规划方法.以基于优化算法的泊车路径规划方法得出的泊车路径作为训练样本,利用Python脚本语言建立以自适应遗传算法和拟牛顿法为内核的自动化训练框架,使自动训练后的自适应神经模糊推理系统既可继承基于优化算法的泊车路径规划方法适用范围更广的优势,又有效...     

车门闭合力测试仪器研制

利用激光测速原理设计了车门闭合力测试仪,给出了光学系统及激光系统电路。该仪器采用半导体激光器作为点光源,记录激光束依次通过车门某点的时间间隔,测出车门速度,进而计算出车门轴锁系统的阻力。分析了该仪器测试误差来源并提出了解决方法。试验结果表明,该仪器的测量数据精度能够满足轿车车门闭合力的检测要求。     

基于专家调查的珠三角地区软土地基处理方法的可靠性研究

主要对珠江三角洲高速公路建设中常用的排水固结法、排水固结法+换填轻质填料、搅拌桩复合地基、CFG桩复合地基、管桩地基等5种软基加固处理方法,开展了基于专家调查的高速公路软土地基加固处理方法可靠性分析与研究。通过对来自高速公路管理、设计、施工、研究单位的67位具有丰富的软土地基加固处理工程经验的专家开展咨询和调查分析,得出了不同软土深度情况下各种软基加固方法的可靠性程度评价结果。研究显示,珠江三角洲软土路基加固处理方法的可靠性从高往低的排列顺序依次为管桩地基、CFG桩复合地基、排水固结法+换填轻质填料、排水固结法、搅拌桩复合地基。当软土深度超过20m时,一般宜采用管桩进行地基加固处理。     

铁路通信网质量人工智能评估系统的研究及应用

梳理和总结了铁路通信网的维护管理要求,结合铁路通信网的“全寿命管理”需求和未来的“智能运维”理念,针对适合于铁路特点的数据分析、评估决策场景进行算法研究和模型建立,采用自动采集、多维存储、大数据分析和“管理驾驶舱”可视化等新技术,研究建设了铁路通信网质量人工智能评估系统,实现对骨干通信网质量数据的全寿命期的采集、分析及管理,为网络优化调整、业务资源变更和修程修制改革提供数据基础,为推广全路通信网的质量管理提供了科学依据。     

A Critical Analysis of DEA Applications to Seaport Economic Efficiency Measurement

Abstract

The significant increase in the adoption of Data Envelopment Analysis (DEA) for seaport efficiency measurement renders a literature synthesis and critical analysis of the application of the technique relevant and worthwhile. This paper provides a thorough review and critical analysis of the major studies undertaken to date, and highlights some problems and limitations in the application of the technique in the seaport context particularly in the specification of parameters, the sampling domain and the type of DEA to be applied. The paper informs the decision process as to the merits and limitations of DEA approaches for seaport efficiency measurement and makes a contribution towards methodological improvement by considering variations not yet applied to the port sector.     

Estimating vehicle miles traveled combined with ITS data

‘Vehicle miles traveled’ (VMT) is an important performance measure for highway systems. Currently, VMT [or ‘annual average daily traffic’ (AADT)] is estimated from a combination of permanent counting stations and short-term counts done at specified locations as part of the Highway Performance Monitoring System (HPMS) mandated by the US Federal Highway Administration. However, on some roadway sections, Intelligent Transportation Systems (ITS) such as detectors and cameras also produce traffic data. The question addressed in this paper is whether and under what conditions ITS systems data could be used instead of HPMS short-term counts (called ‘coverage counts’)? This paper develops a methodology for determining a threshold number of missing daily traffic counts, or alternatively, the number of valid ITS data observations needed, in order to confidently replace the HPMS coverage counts with ITS data.

Because ITS counts, coverage counts, and actual ground counts (e.g. continuous counts) cannot be found coexisting on a roadway section, it is hard to compare them directly. In this paper, the Monte Carlo simulation method is employed to generate synthetic ITS counts and coverage counts from a set of relatively complete traffic counts collected at a continuous count station. Comparisons are made between simulated ITS counts, coverage counts, and actual ground counts. The simulation results indicate that when there are<330 daily traffic counts missing in a set of ITS counts in a year, that is, when there are at least 35 days of valid data, ITS counts can be used to derive a better AADT than using coverage counts. This result is applied to calculate the VMT for the Hampton Roads region in Virginia. The comparison between the VMTs derived with using and not using the threshold number indicates that these two VMTs are significantly different.     

漫滩水流动量修正系数特性分析与模拟

以明渠深度平均二维水流模型为基础,研究了漫滩水流的动量修正系数.结果表明,漫滩瞬时动量修正系数迅速增大,随后快速减小;滩槽宽度比越大,动量修正系数变化程度越大,而传统断面平均法的计算结果恒为1,与实际情况存在较大差异,不能用于水流漫滩的模拟.为了反映动量修正系数的实际变化规律,提出了水流漫滩时断面动量修正系数新的计算方...     

S河综合治理PPP项目投融资模式及实施效果分析

PPP投资模式目前在国内基础设施建设领域得到了广泛的应用,咨询工程公司选择适用的投资和融资模式非常必要和重要。咨询工程公司参与水治理PPP项目进行投融资模式设计时,一方面要适应项目本身需求,另一方面需要契合政策,做到合法合规。通过实际案例研究,以S河治理PPP项目为例,对项目投融资模式运作优势进行研究分析,阐述当前政策对项目的影响以及所采取的调整措施,综合分析项目的实施效果,提出咨询工程公司实施PPP项目投融资须紧跟政策、因地制宜、顺势而为、步步为营。     

海军电子侦察船发展建议

电子侦察船具有活动范围大、任务持续时间长、综合侦察能力等优势,成为海上电子情报侦察体系的重要组成,论文在研究国外电子侦察船装备情况及特点的基础上,结合海军转型发展分析了发展电子侦察船的作用意义,提出了我国电子情况侦察船发展建议,为后续装备发展提供借鉴和参考。     

基于数据驱动的区域交通TOD时段识别方法研究

提出了一种基于数据驱动的T OD时段识别方法,对区域不同路口、不同流向、不同时刻的交通流数据,采用多元相关分析、主成分分析等在空间尺度上识别出路网的关键路口和关键交通流向,采用层次聚类在时间尺度上识别出不同的交通状态和各T OD时段。以9个道路交叉口流量数据为应用实例,获取其中6个不同路口方向为关键交通流,并将不同时刻观测值聚类为5种不同的交通状态,进而识别出1 d的8个 T OD时段,每个时段分别代表干线或区域高、中、低等不同流量时期,表明了该方法的有效性。