nhx中文什么意思

加热罩式炉、氮氢

例句与用法

1. Short term tenancy tender stt no . ehx - 272 stt no . nhx - 671 stt no . 3515 kwai tsing tender closing date : 12 : 00 noon on 25 october 2002
   短期租约招标租约编号:第ehx - 272号租约编号:第nhx - 671号租约编号:葵青第3515号投标截止日期: 2002年10月25日
2. Firstly , in this paper , we review the histories of xml and xml database , and all kinds of data models used widely now . then we review traditional access control policies and policies specially used on xml , and present a new expression method of access set on xml based on child tree of w3c data model . and we bring rbac model into xml database and present a new xml access model x - rbac . because the usage of data in databases has high frequency , we present an ids model based on access set density to logging the potential security threats . and then we introduce the design and implementation of a prototype of our native xml database nhx and its access control system . finally , we draw a conclusion for this paper and the future work
   本文首先回顾了xml及xml数据库的历史,并总结了目前广泛使用的xml数据模型,在分析了各种传统数据库访问控制策略,以及xml的专有访问控制策略的优缺点后,基于w3c的xml数据模型,提出了一种基于子树的具有高弹性的便于实现的的访问区域表示法,并将rbac模型引入进来,提出了一种适用于xml数据库的访问控制模型x - rbac ,同时为了区分xml数据库访问中的合法访问和合理访问,我们根据数据库访问具有频繁性这一特征,提出了一种基于区域访问密度的入侵检测模型( ids ) ,以对隐藏在正常访问中的潜在安全威胁进行报警和日志。