在PPT课件中嵌入视频文件的制作技巧

在PPT课件中使用普通方法链接的视频,如果把视频源文件删除后,链接到PPT课件中的视频就无法播放了.本文通过把视频文件转换成.swf格式大件,再利用Shockwave Flash Object控件,把.swf格式文件嵌入到PPT课件中,真正实现了视频大件的嵌入.     

基于类的VB.NET控件数组设计

为了解决VB.NET中控件不能象VB6.0使用数组的问题,提出了善于类的控件数组解决方案,并就类控件数组的设计原理和实现方法进行了介绍.     

基于PROFIBUS网络人机控制的卷烟厂风送系统信息交换平台设计研究

某卷烟厂整个风力送丝系统由一、二、三车间三个各自独立的部份及管控模式构成,由于原风量平衡系统没有建立风送系统车间级信息交换平台,使得二、三车间不能实现生产信息的互通造成系统出现问题时常出现处理不及时而影响生产的情况,同时这也会此造成大量的能源浪费。本文针对这些问题,在原设计没有的基础上,通过在二车间生产现场增加一台能上网的人机接口设备(西门子MP370触摸屏)和对系统重新组态及进行风量平衡程序设计编写,建立了车间级的风送系统通信平台,这不但加强了各车间的数据的有效通讯,而且提高了设备运行效率,保证了产品生产质量。     

PLC在CGJ-100铣切机控制系统中的应用研究

根据铣切机对罗杰斯板的加工过程,采用台达PLC作为下位机,触摸屏作为人机界面,构成铣切机控制系统,通过PLC控制X、Y及Z 3个运动轴,实现控制自动化。在实际运行中表明,采用该控制系统提高了生产效率。     

中央空调自动控制系统概述

介绍了中央空调自动控制系统的组成、内容、功能、特点和分类,着重介绍了几种常用的中央空调自动控制方法。     

基于片上PowerPC的Vxworks处理平台的波束控制设计

片上嵌入式系统凭借其诸多方面的优势,如成本低、功耗低、尺寸小、处理速度快、可靠性高、实时性强、灵活性、产品上市时间以及设计开发周期短等优势,将嵌入式实时多任务操作系统VxWorks和基于FPGA的片上PowerPC平台相结合,使产品体积更小、环境适应性更强、运行更可靠、扩展和升级更灵活、生产成本更低。必将成为将来雷达产品上的主流技术。本文提出了在其内嵌PowerPC440处理器上构建Vxworks操作系统平台的雷达的波束控制设计。     

三相多脉波自耦变压整流器和Udc-PWM控制（上）

介绍了三相大功率多脉波自耦变压整流器的基本工作原理和Udc-PWM控制方法。     

教室照明节能控制系统的智能化和可视化设计

针对目前高校教室照明日光灯不合理使用而造成的电力资源浪费问题,提出了由MSP430单片机、光频转换器和人体感应传感器组成的节能控制系统,通过合理安排时间以及综合处理人体和光强信号,来实现灯光的智能开、关,从而达到节能的智能化;通过C#编写的窗口程序和MSP430单片机的结合,将下位机上传的数据在上位机进行可视的实时监控。     

An autonomous QoE-driven network management framework

Recently, network researchers have taken a great interest in quality of experience (QoE) and in the new aspects it brings in the study of the link between network conditions and user satisfaction. Also, the realization that the information of users’ satisfaction can be directly applied in the network management in a real-time manner has resulted in a fair amount of publications. Although the systems and frameworks presented in these publications tackle the subject of QoE-driven management quite successfully, they often concentrate on certain applications or technologies. We present a generic QoE management framework, which is applicable to a broad range of systems. We also demonstrate an instantiation of this framework as a network access point management system for RTP-based video. This system is not only able to positively affect the perceived quality of the multimedia application considered, but also to reduce over-prioritization and optimize resource usage.     

An efficient reversible data hiding scheme using prediction and optimal side information selection

In this paper, we present an efficient histogram shifting (HS) based reversible data hiding scheme for copyright protection of multimedia. Firstly, an improved HS based multi-layer embedding process for rhombus prediction is employed by introducing a control parameter to explore the correlation of prediction errors. A rate-distortion model for HS embedding is then developed for optimal side information selection, which is especially suitable for low payload reversible data hiding when only a single layer embedding is required. Finally, a modified location map is constructed to facilitate the compression of location map and further increase the embedding capacity. Compared with similar schemes, experimental results demonstrate the superior performance of the proposed scheme in the terms of embedding capacity and stego-image quality.