具有模糊系数的运输投资多目标0—1规划研究

以运输投资项目投资的问题为背景,建立了具有模糊系数的运输投资问题的多目标线性０－１规划ＦＩＭＯＬＰ数学模型,运用模糊集合理论,将ＦＴＩＭＯＬＰ问题转化为求解目标函数值相对决策者理论值的最大满意度水平问题,并给出了求解的算法步骤,为运输投资决策提供了基础。     

实时图像处理系统的软件开发技术研究

本文分析了图像处理系统中不同编程方法的处理效率,提出了基于实式下直接访问４ＧＢ内存及其Ｃ程序设计方法,从而实现了对扩展内存中的图像数据进行直接访问和运算。最后,讨论了应用ＶＥＳＡ视频接口时行图像显示的编程方法。     

Rescheduling through stop-skipping in dense railway systems

Based on the analysis of the railway system in the Paris region in France, this paper presents a rescheduling problem in which stops on train lines can be skipped and services are retimed to recover when limited disturbances occur. Indeed, in such mass transit systems, minor disturbances tend to propagate and generate larger delays through the shared use of resources, if no action is quickly taken. An integrated Integer Linear Programming model is presented whose objective function minimizes both the recovery time and the waiting time of passengers. Additional criteria related to the weighted number of train stops that are skipped are included in the objective function. Rolling-stock constraints are also taken into account to propose a feasible plan. Computational experiments on real data are conducted to show the impact of rescheduling decisions depending on key parameters such as the duration of the disturbances and the minimal turning time between trains. The trade-off between the different criteria in the objective function is also illustrated and discussed.     

Non-discriminatory train dispatching in a rail transport market with multiple competing and collaborative train operating companies

Train dispatching is vital for the punctuality of train services, which is critical for a train operating company (TOC) to maintain its competitiveness. Due to the introduction of competition in the railway transport market, the issue of discrimination is attracting more and more attention. This paper focuses on delivering non-discriminatory train dispatching solutions while multiple TOCs are competing in a rail transport market, and investigating impacting factors of the inequity of train dispatching solutions. A mixed integer linear programming (MILP) model is first proposed, in which the inequity of competitors (i.e., trains and TOCs) is formalized by a set of constraints. In order to provide a more flexible framework, a model is further reformulated where the inequity of competitors is formalized as the maximum individual deviation of competitors’ delay cost from average delay cost in the objective function. Complex infrastructure capacity constraints are considered and modelled through a big M-based approach. The proposed models are solved by a standard MILP solver. A set of comprehensive experiments is conducted on a real-world dataset adapted from the Dutch railway network to test the efficiency, effectiveness, and applicability of the proposed models, as well as determine the trade-off between train delays and delay equity.     

基于目标监督的先验形状level set模型分割心脏MR图像

提出一种基于目标监督的先验形状level set模型分割心脏MR图像的方法。该方法先根据目标灰度的特征生成特征图像,使得特征图像目标区域灰度趋于一致,再在特征图像的基础上利用先验形状信息的水平集模型对目标进行分割。实验结果表明,该方法能够有效地分割心脏MRI图像。     

Fuzzy neural network control of underwater vehicles based on desired state programming

1 Introduction1 With the development of the activities in deep sea, the application of underwater vehicle is widespread. However, owing to the nonlinearity and unpredictable operating environment of underwater vehicles, many factors must be taken into con…     

基于Web的程序执行效果动态演示软件的设计

程序的单步演示有利于学生理解程序的执行流程,也方便教师的讲解.本文介绍的演示软件采用Java Applet编程实现,该软件具有较大适应性,被演示程序和执行效果描述均通过Applet参数传递.     

多重网络型船舶主机遥控仿真系统的设计与开发

轮机模拟器是现代化航海教育的必备设施,其中最重要的子系统是船舶主机遥控仿真系统.文章介绍了船舶主机气动操作系统的实时仿真构思、多重网络的硬件结构组成、仿真系统功能和软件编程思想,详细阐述了该系统的实时在线仿真、离线单步运行和任意时间比例尺连续运行特点.     

城市道路交通网络容量问题分析

城市道路网络容量是判断现状城市道路网是否处于一种平衡稳定状态的重要决策变量。在对路网容量影响因素进行分析的基础上,将路网容量计算方法按照微观和宏观2个层面划分。针对研究路网容量存在的问题,提出一种新的基于出行者随机路径选择的研究路网容量方法,为今后深入研究在复杂道路条件下的路网容量提供科学理论依据和技术路线。     

面向对象的PC梁桥CAD优化估束方法研究

PC梁桥的配束计算是工程设计中烦琐而又关键的过程,通过采用面向对象的程序设计技术,开发基于工程设计对象的预应力混凝土连续梁桥自动优化估束CAD技术,并根据主梁结构模型利用有限元分析程序计算结构内力及作为估束内力反馈给估束模块使用,建立的预应力钢束优化数学模型,可以实现钢柬用量的优化设计计算,满足工程设计需要。