虚拟终端VT模型的研究与设计

Research and design of virtual terminal VT model

网络环境下系统终端以不同的方式与用户主机相连,终端的数量、类型十分繁杂,使得终端硬件管理、网络安全管理均存在一定的难度和风险。为改善终端使用的孤立与共享之间的矛盾,要求进一步提高虚拟终端的应用深度与广度。为此提出了一种虚拟终端模型设计方案,本方案给出了模型结构与组成,其关键部分是VT用户之间的通信区CCA,由概念数据存储器CDS、控制指令和状态存储器CSS、数据结构定义器DSD、访问控制器ACS组成。此外,文中还给出了VT服务原语,提供了用户与服务提供方之间的交互工具。VT系统的进一步完善将对终端接入类目的减少,提高资源的利用率发挥重要作用,也为系统的安全保护产生积极推动作用。

Under the environment of network terminal system in different ways with the user is connected with the main machine, terminal number, type is very complicated, the terminal hardware management, network security management has a certain degree of difficulty and risk. As the contradiction between improving terminal using isolated and sharing , it further improves the depth and breadth of the application of virtual terminal. This paper presents a design scheme of virtual terminal model, this scheme gives out the model structure and composition, the key part is the communication area between VT user CCA, the concept of data memory CDS, control instruction and state memory CSS, definition of data structure for DSD, the access controller ACS. In addition, the paper also presents the VT service primitives, interactive tool provides users with the service provider. Further improvement of the VT system of terminal access category reduce, make an important role in improving the utilization rate of resources, but also for the safety protection system has a positive role in promoting.