On core service , we implement an access control strategy based on role , digital signature and encryption / decryption of soap message by using usbkey hardware , stateful web service through extending simple object access protocol ( soap ) , and a kind of log management based on rank . on transport adaptering , we implement mechanisms for priority - based transmitting and rules - based transmitting , and implement a transport adapter based on http request / response model . finally , on service adaptering , we discuss two service wrapper mechanisms : runtime wrapper mechanism and factory method wrapper mechanism , which can be used to encapsulate difference of various web service containers , and implement a service adapter 在核心服务方面,通过扩展简单对象访问协议( simpleobjectaccessprotocol , soap )实现有状态的web服务,然后讨论了基于角色的访问控制与基于usbkey盘的soap消息的数字签名与加密的实现、基于分级的日志处理模型的实现;在传输适配方面,实现了基于优先级和基于规则的消息转发机制,实现了基于http请求/响应模型的传输适配器;在服务适配方面,讨论了两种服务的封装机制:运行时封装机制与工厂方法封装机制,结合这两种机制并对服务适配器做了实现。
With argumentation and comparing the difficulty of developing in different ways , in multimedia communication the terminal make up with mpeg - 4 encoder and decoder based on vw2010 chip , main controller based on x86 core and pc compatible stpc soc chip , ethernet adapter based on rtl8139 . and this hardware platform can run linux operation system . the following works are done by auther . 1 . participate in designing the project of multimedia terminal 经过论证和比较,权衡了开发难度和系统性能,在多媒体视频会议终端设计中采用了基于x86内核片上系统芯片stpc的主控制器模块,基于vw2010芯片的mpeg - 4音视频编解码器模块,基于rtl8139芯片的10m / 100m以太网适配器模块的硬件架构,主控制模块运行linux操作系统,作为多媒体终端的软件运行环境及软件开发环境。
Aiming at the shortage of the present industry control system , a control system using can bus adapter based on usb bus is presented . this system has high - speed smart communication ability with low power design , and it can be widely used in industrial control system 本文针对目前工业现场控制系统存在的不足，提出了采用基于usb总线的can总线适配器的工业控制系统，该系统具有高速、智能化的通讯能力以及低功耗设计，该适配器可利用在多种工业控制系统中，应用范围广。
