盐通高铁与宁启铁路交叉并线区段GSM-R方案研究

盐通高铁与宁启铁路在海安、如皋地区存在多处交叉并线,交叉并线区段GSM-R覆盖方案已成为铁路通信系统的设计重点和难点。对盐通高铁与宁启铁路交叉并线区段的G S M-R覆盖方案进行研究,并从建设投资、运营维护、网络优化、频率规划等方面分析各个方案的优缺点,最终提出工程实施方案,为今后类似工程提供了工程案例。     

基于网络交通分配方法族谱的交通分配 一体化技术与工程应用

为满足交通规划、建设与管理等应用场景对交通分配多样化的需求，结合目前交通分配方 法族谱中的众多模型与方法，本文构建能够满足族谱中所有交通分配特征的一体化交通分配技 术框架，提出交通网络交通分配一体化技术体系，并将该体系嵌入交通分析平台软件“交运之星- TranStar”中。该技术体系包括：“模型关键参数”“交通阻抗函数”“交通网络交通分配基础模型与 快速算法”3部分模块组合的分析模型一体化；面向步行、自行车、机动车及公共交通等多模式交 通网络的分析对象一体化；针对城市土地开发，交通网络建设，交通管理控制，公共交通系统，以 及交通政策制定等应用场景一体化。选取南京市道路网络和公交网络进行实证分析。结果表 明，本文提出的交通分配一体化技术具有处理超万节点多模式交通网络的能力，对各类交通模 式、典型业务场景的分析结果可为城市交通系统规划、建设与管理提供决策支持。     

基于交错并联的Ⅱ型五电平逆变器电路的仿真研究

研究了一种基于交错并联的Ⅱ型五电平逆变器电路。该拓扑是双BUCK电路的一种变形,可以视为双BUCK拓扑和交错并联技术结合的产物。这种拓扑减少了开关器件,降低了系统复杂度,而且提高了输出频率,大幅度减小了用于滤波的无源器件的体积。介绍了该拓扑存在的7种状态和4种模态。介绍了Ⅱ型五电平的单向仿真,详细阐述了其正弦脉宽调制.仿真结果符合之前的理论研究,说明该拓扑在大功率变换场合有其前景。     

An Improved Model for Computing-Intensive Tasks on Heterogeneous Workstations

IntroductionIt is well known that many concurrent- com-puting tasks,which consume time badly,can besolved on a massive parallel system using parallelcomputing in order to acquire less execution time.Generally a massive parallel system is very expen-sive a…     

从机会成本的角度谈稳定层摊铺机械的选型

从经济学观点出发 ,利用机会成本原理 ,结合本公司承建的电湛高速公路路面工程特点 ,对该路面工程所应用的基层摊铺机的选型方案进行分析     

A Soft Parallel Interference Cancellation Algorithm in WCDMA

A two-stage soft parallel interference cancellation (SPIC) algorithm in WCDMA system is proposed. The performance of the algorithm is analysed in perfect power control and near-far case, and the influence of the timing error on the system BER is discussed. Analysis and simulation show that the SPIC technique can enhance system capacity, and have a good ability to resist near-far impact. With its simple structure, it has good potential for practical applications.     

并行机器人结构刚度有限元数值模拟

通过有限元数值模拟对并行机器人的结构刚度进行了分析。并行机器人的刚度可以通过有限元数值模拟方法对其进行分析．基于子结构的概念并鉴于大多数并行机器人都具有结构对称性特征。提出了一种有效的数值模拟方法——模块设计方法，并通过一个应用实例显示了这种方法的有效性．对数值模拟结果进行了整理并在此基础上绘制了Isoglide3-T3并行机器人的刚度图。     

关于带闭链工业机器人的动力学建模研究

本文在以影响系数矩阵为基础进行带闭链机器人的动力学方程推导时，采用了符号一数值方法。在计算机上获得一，二阶影响系数矩阵和动力学方程中各矩阵元素的最简解近表达式，解决了当分支的广义坐标数不等于６时出现的长方形（奇异）矩阵求逆的解析表达问题。在ＶＡＸ机上偏制调试出了该方法应的软件，并应用于一个带单闭链地的的孤焊机械手的动力学建模。     

A Dynamic Job Scheduling Algorithm for Parallel System

One of the fundamental problems in parallel and distributed systems is deciding how to allocate jobs to processors. The goals of job scheduling in a parallel environment are to minimize the parallel execution time of a job and try to balance the user‘s desire with the system‘s desire. The users always want their jobs be completed as quickly as possible, while the system wants to service as many jobs as possible. In this paper, a dynamic job-scheduling algorithm was introduced. This algorithm tries to utilize the information of a practical system to allo-cate the jobs more evenly. The communication time between the processor and scheduler is overlapped with the computation time of the processor. So the communication overhead can he little. The principle of scheduling the job is based on the desirability of each processor. The scheduler would not allocate a new job to a processor that is already fully utilized. The execution efficiency of the system will he increased. This algorithm also can he reused in other complex algorithms.     

NEURAL NETWORK TRAINING WITH PARALLEL PARTICLE SWARM OPTIMIZER

Feed forward neural net works such as multi-layer perceptron,radial basis function neural net-works,have been widely applied to classification,function approxi mation and data mining.Evolu-tionary computation has been explored to train neu-ral net works as a very promising and competitive al-ternative learning method,because it has potentialto produce global mini mum in the weight space.Recently,an emerging evolutionary computationtechnique,Particle Swar m Opti mization(PSO)be-comes a hot to…