Abstract: Version management of Computer Support Collaborative Design(CSCD) must store all version of design during the course for inquire and search. With full storage, versions access fast, but they take up huge storage space and have a mass of storing redundancy information of version. Difference storage can save storage space, however, with a slow versions access speed and depressed security. This paper proposes two models of difference storage based on STEP, and combines difference storage and full storage by constructing storage threshold function, so space efficiency and time efficiency are balanced effectively.

Key words: Computer Support Collaborative Design(CSCD), version, full storage, difference storage, storage threshold

摘要： 计算机支持的协同设计的版本管理应保存整个设计过程中产生的所有版本，以便查询和检索。在对版本信息的存储方式中，完整版本存储的存取速度快，但占用存储空间大、冗余信息多，差值存储需要的存储空间少，但存取速度慢、安全性低。该文基于STEP数据交换标准，提出2个差值存储模型，通过构造版本存储阈值函数，将差值存储与完整存储相结合，有效实现了空间效率和时间效率的平衡。

关键词: 计算机支持的协同设计, 版本, 完整存储, 差值存储, 存储阈值

CLC Number: 

• TP311