Through the research on database application in cad by the author , a concept named central database ( cdb ) is posed , a cdb is planned and built , a central database management system ( cdbms ) and its development tools are developed with object oriented design ( ood ) method on the basis of autocad sql interface ( asi ) , and the object oriented extension of the rational database system is researched 作者研究了数据库在cad中的应用，提出了中心数据库的概念，规划并建立了一个中心数据库，并在autocad的sol接口( asi )基础上，应用面向对象的设计思想开发了中心数据库管理系统及其开发工具；研究了关系数据库的面向对象扩展技术。
To meet the special requirement in visualization of dynamic terrain , a technology which is called dynamically extending the resolution of terrain surface meshes is proposed based on the aforesaid fast continuous lod terrain rendering algorithm . a theorem on the maximal region which needs to extend its resolution is given and proved 本文在上述算法的基础上，针对动态地形可视化的特殊需求，提出了地表网格分辨率的动态扩展技术，研究并证明了需扩展其分辨率的最大区域，进而提出了动态地形的实时可视化方法。
With the analysis of some security technologies " requirement and specialty , this thesis , at first , discuss how to make use of gina of window operation system to embed the third - party technology - two factor authentication . at the same time , we design and implement authentication module based on tdi to confirm the users who request some resource or service through internet 本文在分析网络安全技术发展背景和现状的基础上，探讨了利用windows操作系统的gina扩展技术将第三方验证技术?双因素身份验证技术嵌入方案；为了验证服务请求者的身份，控制用户对网络资源的访问，通过分析和利用网络传输层驱动技术( tdi ) ，阐述了构建一个安全系统的实现方法和具体技术。
The main work in this dissertation is to study how to construct a more precise initial user profile and a new approval of user profile learning . for the initial user profile constructing , this paper explores two methods based on query expansion technology . one is based on cilin , and the other is based on web mining 在初始化构建用户模板方面,本文提出了两种基于查询扩展技术构造用户模板的新方法:基于《同义词词林(扩展版) 》的查询扩展和基于网络挖掘的查询扩展,并主要对基于网络挖掘的查询扩展技术进行了深入的研究。
By using this method , we could make the extended testin and controling system to satisfy the real - time requriement of application . this article is based on the research of " the helicopter ' s aviating load - data harmonized loading and sampling technology " . we studied the question of real - time in the helicopter ' s aviating load - data sampling system , and finally realized the real - time extension of the system which based on windows2000 to improve the real - time performance of the system 本文结合中航二集团“十五”预研课题( 41801100101 ) ? “直升机飞行载荷数字化协调加载及数据采集技术研究” ，对数据采集系统中的实时性问题和实时扩展技术展开深入研究，最终实现了基于windows2000测控系统的实时扩展，并将其应用于实际的采集系统研制和开发中。
