VSAM ( virtual storage access method ) is a high performance access method in IBM operating system for direct access storage that runs in virtual storage and uses virtual storage to buffer input and output operations. 虚拟存贮存取方法VSAM是IBM大中型机器操作系统的组成部分,用于虚拟存贮环境中的直接存取存贮器及用虚拟存贮器作输入输出操作的缓冲。
The framework for evaluation of virtual enterprise performance proposed in this paper involves four key elements : input, output, flexibility and agility. 提出了虚拟企业的性能评价指标框架,涉及投入、产出、柔性和敏捷性4个关键因素。
Virtual reality is a technology which is often regarded as a natural extension In3D computer graphics with advanced input and output devices. 虚拟现实技术通常被认为是三维计算机图形学在先进的输入和输出设备支持下的一种自然延生和增强。
Virtual assembly design is often regarded as a technology innovation for assembly design, and it can extend assembly design process to 3D computer graphics naturally with advanced input and output devices. 虚拟装配设计被认为是对装配设计的技术革新,它利用虚拟外设把装配设计的过程自然地扩展到三维空间。
The feature of the method lies in the use of the concept of virtual reference input to create both switch function and performance index function. Thus we can directly choose and modify the parameterized controller by using the plant ′ s on-line input and output data. 其特点是通过引入虚拟参考输入的概念,建立切换函数和性能指标函数,利用被控对象的输入、输出数据直接在线选择、调整参数化的控制器。