A method to estimate trip O‐D patterns using a neural network approach

This paper proposes a method which identifies the trip origin‐destination (O‐D) matrix when many pairs of values for the right hand side column (B) and the bottom row (A) of the matrix are given. The method considers B and A as the cause (input) and effect (output) of a system, respectively, and that the O‐D matrix represents the relationship between the cause and the effect. The relationship which satisfies all pairs of the cause and the effect data exactly may not be identified, but, should a general pattern of the relationship exist, it should emerge when many data sets of B and A are given. Two steps are involved in the method: the first step examines if a consistent O‐D pattern exists; if a pattern is found to exist, the second step identifies the values of the elements of the O‐D matrix. The first step is based on the shape of the possibility distributions of the values of the matrix elements. The second step uses a simple back‐propagation neural network. The method is useful to problems that require identification of the cause‐effect relationship when many sets of data for the cause and effect are available, for example, the station‐to‐station travel pattern on a rapid transit line when the total entering and exiting passengers are known at each station for many different days. The model can also be applied to other transportation problems which involve input and output relation.     

湖北省高速公路计重收费拆分方案

基于高速公路联网收费的原则，提出了联网收费通行费拆分算法，并在湖北省联网计重收费拆分结算系统的基础上，设计了计重货车通行费的拆分算法。     

青藏高原冻土地区输电线路电力杆塔基础设计

通过分析多年冻土对电力杆塔基础的受力特点,并经过理论计算及对非冻土地区和冻土地区电力杆塔基础设置的比较,论述了青藏高原多年冻土地区电力输电线路杆塔基础设计的特殊性和必要性,为冻土地区输电线路杆塔基础设置提供了新的技术和方法.     

基于VBA生成订单并实现整车计划制作的方法

通过VBA编程,将大颗粒的销售预测信息转化为小颗粒的订单信息,为生产计划的制作提供基本素材,大量节约生产计划编制时间,生成的订单在完整体现预测信息的同时还更加贴合实际需求。运用此方法生成订单编制的生产计划用时短,信息准确。细化后的订单对计划的调整可快速应对,从而确保了物料需求信息的及时、准确传递。     

粗糙集理论在通信电台装载平台识别中的应用

粗糙集理论能有效地分析和处理不精确、不一致和不完整等各种不完备信息，并从中发现隐含的知识，揭示潜在的规律。讨论了粗糙集理论用于通信电台装载平台识别的方法，实践表明该方法具有重要的应用价值。     

Determination of the transportable moisture limit of iron ore fines for the prevention of liquefaction in bulk carriers

In 2013, over 500 million metric tons of Iron Ore Fines (IOF) were transported around the world using bulk carriers. Under certain conditions IOF, while being transported, can possibly undergo liquefaction. Since 2006, there has been eight reported bulk carrier casualties possibly caused by the liquefaction of IOF. The objective of this study is to evaluate, compare and verify the limitations and relevance of the Proctor/Fagerberg, Flow Table and Penetration test methods that are used to determine the Transportable Moisture Limit (TML) of IOF. The TML is the maximum gross water content that bulk cargoes, including IOF, may contain while being transported at sea without being at risk of liquefying. A thorough literature review, along with laboratory research, was carried out to compare the TML results from the three leading test methods to determine whether they produce reliable results when testing IOF. The study concludes that the three test methods, as stated in the 2012 International Maritime Solid Bulk Cargoes Code, are unverified and therefore not appropriate for testing IOF. This is due to the variation in the results produced by the three test methods and also due to the difference in the physical properties of IOF when compared with the materials that were originally intended for testing. It is noted that the TML alone may not control the potential liquefaction of IOF and further studies, regarding the physical properties and system variables, which cause the material to liquefy, are required to determine the liquefaction potential of IOF.     

碎石桩加固铁路路堤液化地基孔压变化的模型试验研究

以玉蒙铁路碎石桩加固处理路堤液化地基为工程背景，采用水平振动模拟地震荷载进行了碎石桩复合地基路基的振动台模型试验，试验测试了不同位置的孔压，对孔压的时程、分布特点和孔压比的变化进行了分析。水平加速度为0.3g时，路堤坡脚以外地基产生液化，而路堤范围内未出现液化。采用碎石桩复合地基加固铁路液化地基时，需适当加宽加固地基的宽度。     

轨道交通信号系统安全信息传输中的循环冗余校验软件实现

分析城市轨道交通安全信息传输中常用的循环冗余校验(CRC)的编码和检纠错原理。提出单个比特错误、两个比特错误、奇数个比特错误和并发错误四种情况下选择多项式的原则。在此基础上给出详细的软件算法与软件实现。以减少运算量来达到减小处理时间的目的。     

联锁表的带动道岔、防护道岔设计方法

阐述联锁表的带动道岔、防护道岔设计方法,总结带动道岔、防护道岔的设计规律,对带动道岔、防护道岔的定义、作用、设计方法进行详细描述,对如何设计联锁表的带动道岔、防护道岔有很大参考价值。