Under IDMS, the access to system products is controled by means of a data dictionary, and data access is controled by subscheme, so as to protect IDMS data base accessed from unauthorized users.
IDMS用数据字典控制系统产品的存取,用子模式控制数据的存取,使数据库不被非法用户使用。
The new method overcomes the limitations of established methods of IDMS in the quantitative analysis of trace gas.