PowerBuilder数据窗口多表更新的通用性方法

PowerBuilder中单数据窗口只能更新一个表,目前常用的解决方法是编写函数实现基于单数据窗口的两表更新,当表的数目增加时又需要重新编程或重复调用函数.为克服该局限性,对其进行了改进,通过建立全局函数实现单数据窗口的多表更新,提高了代码的可重用性和可维护性,通过向函数传递不同的参数,使程序不必受制于数据库表的个数和名称,体现其通用性,从而使PowerBuilder应用程序的报表更新技术更完善,更灵活.     

实时多通道话音雷达同步记录仪的RMA实时可调度性分析

作者分析了多种实时任务可调度单调速率分析法(RMA)的适应性，应用一种改进的RMA法分析了作为强实时系统的多通道语音雷达记录仪事件特点，实现了系统的实时可调度性．实验表明，这种单调速率分析法是有效和可行的．     

改进的SR1拟牛顿法的2n步q二次收敛性

为了从理论上证明基于新拟牛顿方程的改进拟牛顿方法比传统的拟牛顿方法有更好的收敛效果，对改进的ＳＲ１拟牛顿方法进行了深入的研究，在变尺度矩阵序列正定有界的条件下，证明了算法在每ｎ＋ｐ（ｐ≥１）步迭代中至少有ｐ步是好的（ｑ超线性步），进而证明了算法的２ｎ步ｑ二次收敛性。     

基于Graphics语言开放型实时数据库的实现

根据开放型实时数据库的要求和特点，本文基于Graphics语言和OPC接口技术提出通过扩展数据采集的通信功能，建立具备扩展特性的设备通信机制，使实时数据库既能完成数据采集，又能够对数据的存取、流程进行控制，实现了实时数据库的功能扩展，大幅度减少了上层软件的计算量和复杂度，应用于过程控制中具有很大的优越性。     

“GPS卫星定位技术”在沿黄公路测量中的应用

就GPS卫星定位技术的一些基本情况以及公路外业测设过程中在控制测量、选线测量、中线放样的实际应用作一简单介绍。     

A Worst-case execution time analysis approach based on independent paths for ARM programs

To overcome disadvantages of traditional worst-case execution time (WCET) analysis approaches, we propose a new WCET analysis approach based on independent paths for ARM programs. Based on the results of program flow analysis, it reduces and partitions the control flow graph of the program and obtains a directed graph. Using linear combinations of independent paths of the directed graph, a set of feasible paths can be generated that gives complete coverage in terms of the program paths considered. Their timing measurements and execution counts of program segments are derived from a limited number of measurements of an instrumented version of the program. After the timing measurement of the feasible paths are linearly expressed by the execution times of program seg-ments, a system of equations is derived as a constraint problem, from which we can obtain the execution times of program segments. By assigning the execution times of program segments to weights of edges in the directed graph, the WCET estimate can be calculated on the basis of graph-theoretical techniques. Comparing our WCET estimate with the WCET measurement obtained by the exhaustive measurement, the maximum error ratio is only 8.259 3 %. It is shown that the proposed approach is an effective way to obtain the safe and tight WCET estimate for ARM programs.     

城中村作为城市“补充空间”实践的探析

城市“补充空间”在利用城中村本身价值基础上,结合城市的发展方向补给城市的必要性空间,使城市的这部分功能空间得以充分利用.就目前从城中村的改造实践来看,城中村作为城市“补充空间”在居住、商业、文化三种类型上补充了城市的功能空间.通过对实例的探讨,提出适应城市发展的、立足发挥城中村城市补充功能和城中村自身特色的、多元方向的城中村改造更新思路.     

NONMONOTONIC TRUST REGION PROJECTED REDUCED HESSIAN ALGORITHM WITH TWO-PIECE UPDATE FOR CONSTRAINED OPTIMIZATION

This paper proposes a two-piece update of projected reduced Hessian algorithm with nonmonotonic trust region strategy for solving nonlinear equality constrained optimization problems. In order to deal with large problems, a two-piece update of twoside projected reduced Hessian is used to replace full Hessian matrix. By adopting the Fletcher's penalty function as the merit function, a nonmonotonic trust region strategy is suggested which does not require the merit function to reduce its value in every iteration. The two-piece update of projected reduced Hessian algorithm which switches to nonmonotonic trust region technique possesses global convergence while maintaining a two-step Q-superlinear local convergence rate under some reasonable conditions. Furthermore, one step Q-superlinear local convergence rate can be obtained if at least one of the update formulas is updated at each iteration by an alternative update rule. The numerical experiment results are reported to show the effectiveness of the propo     

Adaptive stabilization for cascade nonlinear systems

An adaptive controller of full state feedback for certain cascade nonlinear systems achieving input-to-state stability with respect to unknown bounded disturbance is designed using backstepping and control Lyapunov function (CLF) techniques. We show that unknown bounded disturbance can be estimated by update laws, which requires less information on unknown disturbance, as a part of stabilizing control. The design method achieves the desired property: global robust stability. Our contribution is illustrated with the example of a disturbed pendulum.     

一种新的快速鲁棒多摄像头目标跟踪方法

多摄像头(视角)目标跟踪系统中,由于视角间存在大量信息冗余可有效提高跟踪鲁棒性.但在传统基于模板匹配方法中,由于视角不同导致匹配不准,会带来较大跟踪误差.针对这个问题提出了一种基于卡尔曼滤波的在线目标信息时空交互算法,利用多摄像头几何限制,实现多个摄像头的信息交互,减少了模板匹配的搜索范围,进而降低了多摄像头目标跟踪算法的计算复杂度.同时通过在线估计卡尔曼滤波模型中噪声功率,并且自适应调整卡尔曼增益将信息交互过程中误差传递降至最小.仿真结果表明,该方法可以实现更鲁棒的目标跟踪.