基于BU-64843的MIL-STD-1553B 总线远程终端的设计

为了研究MIL-STD-1553B总线协议在某航空机载设备中的使用方法,提升1553B总线远程终端的性能,通过分析1553B总线的结构和特点,提出了采用DSP作为处理器,以BU-64843作为协议芯片实现远程终端（RT）的方案,并进行了硬件和软件的详细设计。相比传统以BU-61580为协议芯片的RT,简化了硬件设计,提高了数据处理能力。对设计的RT进行了1553B总线消息的接收、发送测试,结果表明其能够可靠地实现总线数据的传输,在高性能嵌入式设备的研制中具有一定的工程应用前景。     

基于PXI总线的多路机上铂电阻温度校准系统的设计

针对旋钮式铂电阻模拟仪在温度校准中单次单通道效率低下的问题,提出一种基于PXI总线的可编程多路铂电阻温度校准系统。对系统功能、硬件组成、工作原理和软件设计做了详细的论述。多路温度校准系统选用基于PXI总线的可编程电阻卡,通过程序指令设定温度校准点,经由以太网进行数据传输,上位机软件进行数据记录和处理,最终实现了机上多通道的温度自动化校准。该设备已应用于型号试飞工作中,显著地提高了校准效率和可靠性。     

基于FPGA FIFO处理的多路CAN总线高速通信设计

船舱监控系统中,需要对各种设备的交互数据进行实时采集分析。提出一种基于FPGA多路CAN总线的高速通信设计。采用多路隔离CAN总线通道,在FPGA中引入FIFO处理单元,实现实时操作系统上的高速报文交互。试验证明,该设计有效提高多路CAN总线通信的极限速率,合理优化计算机系统中断资源分配方式,降低CAN总线通信的中断频率。     

基于VxWorks的电视图像测偏

Bt878A视频采集卡和Intel X86微机性能稳定、价格低廉.提出了一套利用Bt878A芯片的视频采集卡在Intel X86平台和嵌入式操作系统VxWorks上实现电视图像取差测偏的方案.通过开放高速缓冲,使PCI总线下,对于90×60像素的波门,处理时间由50 ms缩短到5 ms.     

Combining Constraint Programming and Linear Programming on an Example of Bus Driver Scheduling

This paper provides details of a successful application where the Column Generation algorithm was used to combine Constraint Programming and Linear Programming. In the past, constraint programming and linear programming were considered to be two competing technologies that solved similar types of problems. Both these technologies had their strengths and weaknesses. This paper shows that the two technologies can be combined together to extract the strengths of both these technologies. Details of a real-world application to optimize bus driver duties is given here. This system was developed by ILOG for a major software house in Japan using ILOG-Solver and ILOG-CPLEX, constraint programming and linear programming C/C++ libraries.     

任意光束通过光阑弱衍射在远场的光阑矩阵

本文得到了任意光束通过光阑弱衍射在远场下的光阑ABCD矩阵，并用所得矩阵具体地分析了带硬边光阑的典型谐振腔.     

实时仿真机AC1000及其在工程中的应用

本文就现代新型的半实物实时仿真机ＡＣ１０００ 的硬件、软件、系统配置、系统组成及使用进行了简要的介绍，并在实际中进行了成功地运用。     

公交网络时刻表再协同设计的多目标优化模型

为了改善公交服务质量,公交运营者试图调整现有时刻表的发车时间,使不同线路的车次协同到达换乘站点以方便乘客换乘。针对此场景,研究了公交时刻表重新协同设计问题,提出了求解该问题的多目标模型。模型考虑了对发车间隔灵敏的乘客需求、灵活的车次协同到站方式和发车时间的规则性,分析了该多目标模型的特征和计算复杂性,表明本文研究的问题是NP-hard问题,且它的帕累托最优前沿是非凸的,设计了基于非支配排序的遗传算法求解模型。算例表明,与枚举算法相比,提出的求解算法在较短的时间内可获得高质量的帕累托解。     

Influence of bus stop with left-turn lines between two adjacent signalized intersections

Based on the symmetric two-lane Nagel–Schreckenberg(STNS) model, a three-lane cellular automaton model between two intersections containing a bus stop with left-turning buses is established in which model the occurrences of vehicle accidents are taken into account. The characteristics of traffic flows with different ratios of left-turn lines are discussed via the simulation experiments. The results indicate that the left-turn lines have more negative effects on capacity,accident rate as well as delay if the stop is located close to the intersections, where the negative effect in a near-side stop is more severe than that in a far-side one. The range of appropriate position for a bus stop without the bottleneck effect becomes more and more narrow with the increase of the ratio of left-turn bus lines. When the inflow is small, a short signal cycle and a reasonable offset are beneficial. When the inflow reaches or exceeds the capacity, a longer signal cycle is helpful. But if the stop position is inappropriate, the increase of cycle fails in reducing the negative effect of left-turning buses and the effectiveness of offset is weakened.