存储区域网络的数据安全访问

本文讨论了存储区域网络的可能的安全威胁，剖析了安全威胁点的概念，提出了三层安全边界的SAN安全体系架构，并且着重分析了内部边界的LUN屏蔽和分区两种实现方式。     

电能计量箱远程监控系统

主要介绍一种基于GPRS网络通信及单片机技术实现的电力计量箱监控系统，该系统集遥测、遥控于一体，并且具有具有建网方便，运行成本低的优点。     

数据挖掘与数据仓库技术及其在保险业中的应用

文章介绍了数据挖掘中常用技术和数据仓库结构．并且探讨了粗糙集方法，决策树方法以及关联规则方法等数据挖掘技术在保险风险规则挖掘中的应用。     

基于OLAP技术实现银行客户分析系统

通过构建针对银行客户分析的数据仓库,描述了O鄄LAP系统的设计和实现方法,分析了OLAP服务器的内部结构,并着重研究了OLAP多维立方体的创建和OLAP多维引擎的构造。     

基于VC++语言的HP34401A串口远程控制实现

计算机与外部设备之间有多种通讯方式，串口通讯是一种经济、实用的方式。本文以HP34401A数字万用表为例．详细介绍了VC 环境下利用Windows API函数进行串口编程的方法。     

基于Profibus-DP的PLC与PC现场总线控制系统

目前。石油化工行业中使用的微机发油控制系统大都采用自行开发的单片机系统控制油泵．并通过RS一485总线与PC机的串口(使用RS-232转485转换器)相连。依靠上位机管理软件监控下位机。但化工行业中的设备复杂．且RS-485总线方式抗干扰性弱，使得系统稳定性下降．调试复杂。本系统采用PROFIBUS—DP现场总线技术．下位机为抗干扰性极强的PLC．上位机通过专用PROFIBUS通讯卡CP5611构建的整套系统．分布性、可靠性与可扩展性都得到了极大的提高。本文章通过结合现行开发的基于PROFIBUS—DP的石油化工发油控制系统．主要介绍了现场总线技术，以及如何实现PROFIBUS总线与PLC通讯的相关技术。     

A neural network approach to complete coverage path planning.

Complete coverage path planning requires the robot path to cover every part of the workspace, which is an essential issue in cleaning robots and many other robotic applications such as vacuum robots, painter robots, land mine detectors, lawn mowers, automated harvesters, and window cleaners. In this paper, a novel neural network approach is proposed for complete coverage path planning with obstacle avoidance of cleaning robots in nonstationary environments. The dynamics of each neuron in the topologically organized neural network is characterized by a shunting equation derived from Hodgkin and Huxley's (1952) membrane equation. There are only local lateral connections among neurons. The robot path is autonomously generated from the dynamic activity landscape of the neural network and the previous robot location. The proposed model algorithm is computationally simple. Simulation results show that the proposed model is capable of planning collision-free complete coverage robot paths.     

接地技术在变电站工程设计中的应用

根据笔者多年的实际工作经验,详细分析了目前变电站工程设计及实际应用中,各种接地技术应用存在的问题及问题产生的原因,论证了正确的接地方法及工程设计中需要注意的要点.     

三峡梯级电站日优化算法及应用

三峡-葛洲坝梯级水电站须根据不同的调度要求构造各自不同的优化数学模型。当长江处于汛期和枯水期时，就三峡梯级水库的具体特点，给定了葛洲坝1 d的下泄流量，使用状态逐密动态规划算法建立了日优化运行模型，并用C语言编制了算法程序，得到了满意的计算结果。     

Analysis,simulation and verification of a bipolar current source power resonant inverter

A high‐frequency bipolar current source resonant inverter introduced in this paper has dramatic zero‐voltage‐switching (ZVS) characteristic. The analytic expressions of the resonant voltage and current are given. It indicates that the resonant waveform is composed of two parts, i.e. the oscillatory component and the stationary component. In special cases, the resonant waveform degenerates into the mono‐frequency component, as presents the graceful sinusoidal wave with very low total harmonic distortion (THD) value. Based on the closed‐form voltage and current, the component stresses on reactive elements are obtained. The impact of different component values and operating frequencies on ZVS feature is also discussed. It should be noted that the ZVS merit may be lost if the components are carelessly selected. The validity of the theoretical analysis has been proven with Pspice simulations and experimental results. Copyright © 2004 John Wiley Sons, Ltd.