高校实验室双网路系统的设计与应用

利用代理服务器软件CCProxy、Shutdown.exe程序、主板的电源控制等手段来组建双网路系统,该系统很好地解决了实验室的网路问题。     

基于.net的桌面任务管理器设计

为有效地解决日常管理工作中繁杂的工作任务,提出用.net设计桌面任务管理器,并阐明了设计的基本原理,介绍了设计的详细步骤。     

用C#实现多功能浏览器

利用Visual Studio.NET为平台,用C#语言开发了常用的网络工具多功能浏览器,它包括网页及其源代码浏览器、邮件收发、MP3播放器几个部分.通过这个浏览器可以方便地使用这些经常用到的工具,省去了来回切换窗口的的麻烦.     

PLC与OP27在倍尺飞剪控制系统中的设计与应用

本文主要介绍了PLC与OP27在倍尺飞剪控制系统中的设计思想及其应用,并阐述了该系统的控制过程、系统配置、PLC和OP27的数据交换和STEP 7编程特点及其在倍尺飞剪控制程序的具体应用.     

浅析Ajax技术在Web开发中的应用

ASP.net Ajax实现了Web页面丰富的部分刷新效果.本文通过介绍ASP.net Ajax原理,总结了在Web开发应用中要注意的若干问题.合理地利用ASP.net Ajax技术,Web开发数据库应用就能获得更好的交互效果.     

Fast motion estimation algorithm for H.264/AVC based on centered prediction

H.264/AVC video coding standard can achieve roughly half of the bit-savings over MPEG2 and MPEG4 for a given quality. However, this comes at a cost in considerably increased complexity at the encoder and thus increases the difficulty in hardware implementation. The high redundancy that exists between the successive frames of a video sequence makes it possible to achieve a high data compression ratio. Motion estimation (ME) plays an important role in motion compensated video coding. A fast motion estimation algorithm for H.264/AVC is proposed based on centered prediction, called centered prediction based fast mixed search algorithm (CPFMS). It makes use of the spatial and temporal correlation in motion vector (MV) fields and feature of all-zero blocks to accelerate the searching process. With the initialized searching point prediction, adaptive search window changing and searching direction decision, CPFMS is provided to reduce computation in block-matching process. The experimental results show that the speed of CPFMS is nearly 12 times of FS with a negligible peak signal-noise ratio (PSNR) loss. Also, the efficiency of CPFMS outperforms some popular fast algorithms such as hybrid unsymmetrical cross multi-hexagongrid search and a novel multidirectional gradient descent search evidently.     

Missile robust gain scheduling autopilot design using full block multipliers

Reduction of conservatism is one of the key and difficult problems in missile robust gain scheduling autopilot design based on multipliers. This article presents a scheme of adopting linear parameter-varying (LPV) control approach with full block multipliers to design a missile robust gain scheduling autopilot in order to eliminate conservatism. A model matching design structure with a high demand on matching precision is constructed based on the missile linear fractional transformation (LFT) model. By applying full block S-procedure and elimination lemma, a convex feasibility problem with an infinite number of constraints is formulated to satisfy robust quadratic performance specifications. Then a grid method is adopted to transform the infinite-dimensional convex feasibility problem into a solvable finite-dimensional convex feasibility problem, based on which a gain scheduling controller with linear fractional dependence on the flight Mach number and altitude is derived. Static and dynamic simulation results show the effectiveness and feasibility of the proposed scheme.     

基于MasterCAM轴类零件车铣加工的研究

主要介绍了运用M asterCAM中的Lathe模块创建轴类零件,对轴类零件进行车削加工;创建车削加工刀具路径,进行各种刀具及工艺参数设置,模拟刀具加工过程;对后置处理过程进行了分析,最终生成数控加工所需的后置处理程序,实现轴类零件的自动编程。     

如何编写仿形循环形式的宏程序(FANUC-0iTC系统)

在数控车削加工中,往往遇到有椭圆、抛物线、双曲线等组成内、外轮廓的零件,但是FANUC-0 i系统不具备直接加工这些曲线的指令,只能利用宏程序来加工,因此,编写合理的宏程序至关重要。     

基于比率依赖的两种群捕食者—食饵系统的随机模型

研究一类比率依赖的两种群捕食者-食饵系统的随机模型。利用随机微分方程理论,通过构造Lya-punov泛函,并结合停时分析、不等式构造等技巧,证明了比率依赖的两种群捕食者—食饵随机系统整体解的存在唯一性,整体解的有界性与渐近性质。