In point of the track of the technical development of medium and tools of architectural illustration , the methods of architectural illustration can be divided into five categories , which includes the one - dimensional word , two - dimensional drawings , three - dimensional solid model , four - dimensional animation and the multi - dimensional virtual reality technology 从建筑表现媒介工具的技术发展轨迹来看，建筑表现的方法可以分为一维的语言文字、二维的图纸系统、三维实体模型、四维的动画，以及多通道的虚拟现实技术。
This paper also presents a conference management pattern without mcu , making control and data separate . in order to enhance the bandwidth utilization factor , a multi - channel based transfer method , unicast plus multicast , is brought forward . in the end of this dissertation , we presents implementation methods , which guarantee the continuity and synchronization of video and audio when playbacking 提出了一种无mcu的会议管理模式，实现了控制与数据的分离，所有的音频混合及视频切换功能均由客户端计算机完成；提出了一种基于多通道的“单播+组播”传输方式，提高了系统的带宽利用率；并给出保证视频、音频回放的连续性、同步性的实现方法。
Secondly , the central processing unit ( cpu ) of the tms320c2812 、 peripheral interrupts 、 analog - to - digital converter ( adc ) and event manager ( ev ) modual are reseached . a real - time data operation system based on dsp platform is designed . single and multi - channel real - time data acquisition experiment . is achieved 二、研究了tms320f2812dsp的cpu芯片结构、中断系统、 ad模块和ev模块以及dsp集成开发环境ccs2 . 0 ,利用dec2812 ,设计并实现了实时数据采集系统,完成了单通道以及多通道的数据采集实验。
The system uses the student model agent to monitor the students ’ emotions to carry out the individual learning . also the system uses the corresponding agent to exchange and share information between the teaching organization agent and the cooperative service agent . in this way the students can learn knowledge according to their needs and teachers can teach in accordance of the students ’ aptitude 本文利用agent技术建立的基于web的协作学习平台,使学习者能利用网上丰富的教学资源,个性化的教学模式以及多角度、多层次、多通道的交流方式开展自主的个别化学习与交互式的集体协同学习,这也是未来网络教育的发展趋势。
The current impact experiments have not record the response of force and strain in impact process . elaborate response process of impact for woven composite including impact force of impactor , strain response of different position in the specimen is observed by the special design of impactor and multichannel collection system 目前采用的冲击试验，大多数都没有全面记录冲击过程中的各种响应，本文通过对冲头进行设计，和采用多通道的数据采集系统，得到较为详尽的冲击响应的过程(包括冲击力，试件的正背面响应，离冲击点不同距离的响应) 。
