This scheme integrates universual data accesss technology of microsoft , which plays a more and more important role in three - lay c / s ( client / server ) and uses the technology of ado ( active data access ) , adopts the asp script language in display the results and uses stored procedure of sql server in databases design . in the system of b / s , client realizes a high efficient access to the server database through displaying diversified active controls in browser and using ado to access the data source . the disposing of data accures under the database not in the font of this system . this kind of scheme cannot only bring the system a higher real time response , but also decrease data runoff of the networks , lower the possibility that web server becomes bottleneck of the system and make the system more transplantable 当前的web数据库访问技术正处于发展阶段,针对这种情况,本文通过分析当前各种流行的web数据库访问方案的优缺点,结合在三层次的c / s系统中扮演越来越重要的角色的中间件技术,采用了microsoft公司所提出的一致数据访问技术,利用ado控件,结合当前的asp语言,底层数据库采用了sqlserver7 . 0的存储过程技术,设计了一种自己的web数据库访问方案,即在browser / server系统当中,客户端通过显示在浏览器中的各种activex控件,通过了ado连接数据库,数据的处理利用了存储在数据库内部执行,实现对后端数据库的高效访问,并且这种方案在给系统带来较高的实时响应性能的同时,减少了网络数据流量,降低了web服务器成为系统瓶颈的可能性,也增强了系统的可移植性。
This thesis designes a motion control board which is based on dsp ( digital signal processor ) , the aspects including high speed and high precision , real - time response and opening design of hardware are considered in the design . the motion control board can be plugged in the pci ( peripheral component interconnect ) slot of pc ( personal computer ) , thus forms an inboard open cnc system 本文从高速高精度、实时性和硬件开放式设计等方面考虑,设计了一款基于dsp ( digitalsignalprocessor )的运动控制卡,该卡可直接插接在pc ( personalcomputer )机的pci ( peripheralcomponentinterconnect )插槽中,和pc机组成pc内藏cnc ( computernumericalcontrol )型开放式数控系统。
Because some other existing simulation system , which are similar to the system discussed here , are mainly build upon windows operation system , they gain low performance in real - time response . while the experimental platform system described in this dissertation , is builded upon vxworks real - time operating system . it is much more similar to the target real - time system being simulated then other existing simulation system 针对目前已有1553b总线通信系统试验平台基于windows建立,实时性能不好,与基于专用实时操作系统的真实目标系统相差过大的缺点,本文论述的系统平台基于vxworksrtos建立,通过配备适当的板级支持包和自研的扩展板驱动程序,实现vxworks对节点机系统的支持。
Then , a comprehensive analysis to the design process of the parallel 6 dof platform testing and control system , which based on oop , is given in chapter four , firstly , the difficulty of precise timing and real - time response under windows is analyzed , and then two solutions to the problem are advanced . one of the solutions is to utilize multimedia timer to time and event to respond 第四章针对windows下难以实现精确定时和实时响应,提出了采用多媒体时钟和外接时钟实现精确定时以及采用事件和vxd实现实时响应的方案;对本系统用到的多线程技术进行了阐述;另外,还对本系统的实时性和可靠性进行了分析。
The system which has been realized has many remarkable features : real time response 、 high compatibility 、 high expandability 、 high precision 、 strong reliability and security and friendly man - machine interface etc . based on the requirement analysis , the thesis has firstly designed the physical structure of whole system and field subsystem , it analyzed the mode of field network and design and realization of software 所实现的系统具有实时性好、兼容性好、可扩展性强、测量精度高、安全性高及友好的人机界面等优点。论文首先在需求分析的基础上进行了总体设计及现场子系统的物理结构设计,给出了系统的软件设计要求。分析了现场网络的形式,软件的设计与实现等。
This paper adopts advancing technology . these are com / dcom , asp and the access of web datebase , etc . these schemes can not only bring the system a higher real time response , renew the web pages but also display the alarm information when there is abnormal thing happening 本文采用先进的com dcom分布式组件技术、 asp技术及web数据库访问技术满足了系统较高的实时性要求,实现了数据的实时采集、实时更新,并在浏览器中显示相应的监测信息,以及在监视对象出现异常时及时发送并显示报警信息。
The main achievements of the dissertation are included : ( 1 ) the limitations of the traditional channelized reconnaissance receivers indicate that it cannot be used to receive the ultra - wide radar signal . it is pointed that the ultra - wide receiver must satisfy ultra wide monitoring band , high sensibility , wide dynamic range and almost real - time response 论文主要工作如下: ( 1 )分析了多种传统信道化接收机的结构性能,及其在超宽带信号接收中的局限性,指出超宽带信道化接收机必须满足实时性、高灵敏度和大动态范围等性能。
Abstract : a basic idea and practice method is proposed in this pap er to realize the parallel management of multi - case in a complicated system cons tructed by single - chip computers . the object is to avoid lowing cpu efficiency ca used by too many state detections in the program and to raise the system speed of re al - time response to cases 文摘:提出一种对单片机构成的较复杂系统实现多事件并行管理的基本思想和具体应用的方.其目的是避免因程序中设有过多的状态查询而造成cpu效率降低,提高系统对事件的实时响应
The system has some remarkable features as follows : real time response , high compatibility , high expandability , high precision , interference tolerance and friendly interface etc . considered the analysis of the requirement , the overall design is carried out on the basis of the actual character firstly 该远程监控系统具有实时性好、兼容性好、可扩展性强、测量精度高、抗干扰能力强以及全中文友好人机界面等优点。论文首先在需求分析的基础上,结合本系统的实际特点进行了系统的总体设计。