图示化牵引变电绘图软件包设计思想和方法

结合可视化编程语言VC＋＋的优点实现和AutoCAD的结合,采用最新的面向对象技术、图示化技术,提出并建立牵引变电绘图软件包开发的方法,通过牵引变电站接线图进行测试分析。     

层次分析法在编组站建设项目中的应用研究

简要叙述了层次分析法的概念及应用步骤,通过一个通信项目实例,对两个实施方案进行了比选,详细说明了层次分析法的应用步骤,最后对层次分析法的应用进行了总结,并指出实际应用时需特别注意的关键因素。     

Reducing speed and fuel transfer of the Green Flag Incentive Program in Kaohsiung Port Taiwan

This research applied the Green Flag Program to assess the benefits of reducing speed and fuel transfer for large merchant vessels (bulk and container) entering Kaohsiung Port. This study adopts an activity-based model to calculate fuel consumption and emissions, as well as setting up two scenarios, (1) decrease vessel speed to 12 knots 20 nm away from port; and (2) decrease vessel speed to 12 knots and transfer fuel 20 nm away from port, which based on the Green Flag Program in Long Beach, in the U.S. The findings are (1) In scenario one, the container and bulk vessels saw reductions in CO₂ emissions of about 41% and 14%, respectively. In scenario two, container and bulk vessels had reductions of about 48% and 43% in SO₂ emissions, respectively. (2) Large vessels are more environmentally friendly than small vessels. (3) Using the CATCH model to assess the effectiveness of the two scenarios, it was found that container vessels benefited from both reducing speed and fuel transfer, while bulk carriers only did so from the former.     

Stochastic capacity expansion models for airport facilities

It is important and also challenging to plan airport facilities to meet future traffic needs in a rapidly changing environment, which is characterized by various uncertainties. One key issue in airport facility development is that facility performance functions (delay levels as functions of capacity utilization rates) are nonlinear, which complicates the solution method design. Potential demand fluctuations in a deregulated aviation market add another dimension to the decision making process. To solve this problem, a deterministic total cost minimization model is proposed and then extended into stochastic programs, by including uncertainties in traffic forecasts. After the exploration of properties of the delay cost function, an Outer-Approximation (OA) technique which is superior to the existing discrete approximation is designed. After model enhancements, an efficient solution framework based on the OA technique is used to solve the model to its global optimality by interactively generating upper and lower bounds to the objective. Computational tests demonstrate the validity of developed models and efficiency of proposed algorithms. The total cost is reduced by 18.8% with the stochastic program in the numerical example.     

Coordinated transit signal priority supporting transit progression under Connected Vehicle Technology

In this paper, a person-delay-based optimization method is proposed for an intelligent TSP logic that enables bus/signal cooperation and coordination among consecutive signals under the Connected Vehicle environment. This TSP logic, called TSPCV-C, provides a method to secure the mobility benefit generated by the intelligent TSP logic along a corridor so that the bus delay saved at an upstream intersection is not wasted at downstream intersections. The problem is formulated as a Binary Mixed Integer Linear Program (BMILP) which is solved by standard branch-and-bound method. Minimizing per person delay has been adopted as the criterion for the model. The TSPCV-C is also designed to be conditional. That is, TSP is granted only when the bus is behind schedule and the grant of TSP causes no extra total person delay.The logic developed in this research is evaluated using both analytical and microscopic traffic simulation approaches. Both analytical tests and simulation evaluations compared four scenarios: without TSP (NTSP), conventional TSP (CTSP), TSP with Connected Vehicle (TSPCV), and Coordinated TSP with Connected Vehicle (TSPCV-C). The measures of effectiveness used include bus delay and total travel time of all travelers. The performance of TSPCV-C is compared against conventional TSP (CTSP) under four congestion levels and five intersection spacing cases. The results show that the TSPCV-C greatly reduces bus delay at signalized intersection for all congestion levels and spacing cases considered. Although the TSPCV is not as efficient as TSPCV-C, it still demonstrates sizable improvement over CTSP. An analysis on the intersection spacing cases reveals that, as long as the intersections are not too closely spaced, TSPCV can produce a delay reduction up to 59%. Nevertheless, the mechanism of TSPCV-C is recommended for intersections that are spaced less than 0.5 mile away. Simulation based evaluation results show that the TSPCV-C logic reduces the bus delay between 55% and 75% compared to the conventional TSP. The range of improvement corresponding to the four different v/c ratios tested, which are 0.5, 0.7, 0.9 and 1.0, respectively. No statistically significant negative effects are observed except when the v/c ratio equals 1.0.     

模型面向过程式语言切片工具的实现

本文以一种自定义的小型面向过程式语言(Similar C Language,简称SCL)作为实验语言,在图论和编译技术的基础上,提出了一种分层次切片面向过程式程序的新方法,描述了实现SCL语言切片工具的完整方案。     

25Hz相敏轨道电路的计算

通过分析轨道电路的原理，利用Visual Basic6．0软件和Excel软件编写了轨道电路计算的程序。该程序能够准确地计算轨道电路的调整状态和分路状态，便于大家理解整个轨道电路系统。     

“三现”在整车项目管理中的应用和推广

在汽车企业整车项目管理中,为实现高效的管理,应用和推广“三现”是有效的实现途径.文章在阐述“三现”的起源、内涵及核心思想的基础上,通过介绍项目管理的内涵,结合实际工作遇到的问题,详细地阐述了“三现”在项目管理中推广的重大意义.最后结合项目管理日常的工作,举例说明了在项目不同开发阶段“三现”行为的体现,并介绍了有实际指导意义的“三现”表.     

西津水利枢纽二线船闸工程总平面布置方案研究

西津水利枢纽二线船闸工程是西江黄金水道首批建设项目之一,其船闸轴线位置选择及总平面布置是总体设计和控制工程投资的关键。文章结合西津水利枢纽二线船闸工程建设规模和项目特点,提出了不同的船闸轴线与总平面布置方案,并通过分析比选得出推荐方案,为类似船闸工程设计提供参考及借鉴。     

基于灰色关联分析的某隧道涌水来源识别

文章采用灰色关联分析方法并将其编写成Excel VBA程序,对某隧道进口端涌水的可能来源进行筛选识别,取得了较为满意的计算结果,从而为相关部门制定针对性的隧道涌水整治方案提供了理论依据及技术支撑。