《交换空间》栏目引导新的家装理念浅析

本文通过表述传播学五大要素在《交换空间》栏目中的体现,主要介绍了家装从规划设计到具体实施的整个过程在《交换空间》栏目中的体现,分析了《交换空间》作为一种具体的可实施性强的节目对家庭装饰装修理念新的诠释。     

列存储数据查询中的连接策略选择方法

列的连接策略优化是列存储数据查询中的重要问题。现有的列存储系统中,列的连接存在策略单一,缺少优化处理,无法满足复杂查询等缺陷。针对这些问题,提出一种连接策略选择方法。该方法首先定义简单规则过滤代价过大的查询计划,生成候选查询计划树。进而根据动态Huffman树原理提出动态优化树算法,对候选查询计划树中的查询执行顺序进行改进。根据列存储数据的特点,候选计划中每个连接节点的执行策略被归纳为两种:串行连接和并行连接。在此基础上构建代价估计模型,集中针对这两种连接策略进行代价估计和策略选择,从而以较小的时间复杂度获得优化的查询执行策略。     

基于WSRF的FPGA远程实验服务

介绍WSRF规范,结合FPGA实验特点和WSRF协议中状态管理,设计基于WSRF的远程实验架构。使用WSRF.NET设计与实现FPGA实验资源服务,通过实验验证了服务的正确性。实验结果表明,使用WSRF规范设计FPGA实验资源服务能解决实验的中间状态问题,实现实验时间、空间的开放。     

声卡电路改造及其在运动控制中的应用

为了让计算机声卡能直接采集标准范围内的直流电压信号(-10～+10 V),在分析声卡工作原理的基础上介绍了对声卡外部电路进行改造的方法,并给出了改造后声卡在直流电机运动控制实验系统中的应用.改造后的声卡性能稳定、灵活通用,满足了一般的工程测量和实验教学的使用要求,可作为商用数据采集卡的廉价替代方案,为普通声卡在数据采集...     

A comparative study on some navigation schemes of a real robot tackling moving obstacles

A comparative study of various robot motion planning schemes has been made in the present study. Two soft computing (SC)-based approaches, namely genetic-fuzzy and genetic-neural systems and a conventional potential field method (PFM) have been developed for this purpose. Training to the SC-based approaches is given off-line and the performance of the optimal motion planner has been tested on a real robot. Results of the SC-based motion planners have been compared between themselves and with those of the conventional PFM. Both the SC-based approaches are found to perform better than the PFM in terms of traveling time taken by the robot. Moreover, the performance of fuzzy logic-based motion planner is seen to be comparable with that of neural network-based motion planner. Comparisons among all these three motion planning schemes have been made in terms of robustness, adaptability, goal reaching capability and repeatability. Both the SC-based approaches are found to be more adaptive and robust compared to the PFM. It may be due to the fact that there is no in-built learning module in the PFM and consequently, it is unable to plan the velocity of the robot properly.     

Active fault detection and control: Unified formulation and optimal design

A new unified formulation of the active fault detection and control problem for discrete-time stochastic systems and its optimal solution are proposed. The problem formulation stems from the optimal stochastic control problem and includes important special cases: an active detector and controller, an active detector and input signal generator, and an active detector with a given input signal generator. The optimal solution is derived using the so-called closed loop information processing strategy. This strategy respects the influence of the current decision and/or input on the future behavior of the observed system, allows penalizing future wrong decisions, and improves the quality of fault detection. The proposed formulation and obtained solution also provide better understanding of the active fault detection and its relation to the optimal stochastic control. The results are illustrated in numerical examples.     

分布式仿真实验管理系统体系结构

针对采用分布式仿真进行体系对抗仿真面临的问题,如数据的一致性、实验资源部署、初始态势加载、仿真运行控制、实验数据回收等,设计分布式仿真实验管理系统体系结构。以满足武器装备论证对仿真实验样本数据需求为目标,辅助武器装备论证人员进行想定编辑、实验设置、实验规划、实验进程监控等,使分布式仿真技术更好地服务于武器装备论证。     

基于双客服的远程控制实验系统研究与开发

传统的C／S结构和B／S结构各有优缺点,双客户-服务器结构弥补了单一结构存在的缺陷,具有较强的可扩展性。该文针对AE2000B型过程控制实验装置,采用双客户-服务器的软件体系架构,通过自定义通信协议,结合实时曲线的表现方式达到用户远程控制实验的目的。实验结果表明,双客户-服务器结构带来的实验效果令人满意。     

基于80C186处理器的多功能实验板的研制

针对近年来飞机含80C186处理器电路板修理现状,为掌握该系列板件的修理能力,迫切需要开展其软件测试技术研究.从封装、类型以及时序分析角度,在对80C186处理器进行系统阐述基础上,设计并研制一块基于80C186处理器的多功能(包括串口通信、并口检测以及定时计数功能)实验板,给出该板的硬件电路图与软件流程框图,并基于汇编语言在QTH-2008PCI开发环境下进行功能调试,实验结果表明其有效性.所做的含80C186处理器的正向设计与软件编程研究工作对于逆向修理含80C186处理器飞机电路板板件有很大帮助.