The term of " digital earth " is put forward in 1998 . in order to resolve the conflict between the large amount of information and satisfying utilization , it provides an integrated information system with a uniform structure model . “数字地球”的创意是1998年被提出来的,它针对人们拥有海量信息却无法充分利用这一矛盾提出了解决问题的基本框架,并力求用一种统一的结构模型开发出可以汇集全球信息的信息综合系统。
As the hla object model plays a key role in federate development , the technologies about hla object model construction are studied firstly . and then , we designed a tool named yh - omgen , which can well satisfy those needs . the yh - omgen is implemented by c + + and rdbms 针对对象模型在邦元开发过程中的重要地位,本文首先研究了hla对象模型相关技术,提出了一个支持对象模型开发和管理的工具yh - omgen ,并基于c + +语言和关系数据库进行了实现。
Based on the analysis of requirement for logistics system , combining with model - based design methodology , the paper present the analysis and design of all sub - system for logistics information , which includes process model , data concept model , data logic model and user interface 本文在总结企业物流系统需求分析的基础上,结合模型开发方法,分析并设计了物流管理信息系统的各个功能子系统的过程模型、数据逻辑模型、数据概念模型以及用户界面。
Combing the advantages of mda , this thesis put forward a component development method , that is mdac ( mda - based component development ) . the main idea of mdac is that developing , implementing , compositing , and reusing components by modeling , model transformation , model integration , and model reuse . the main work of this thesis as follows : ( 1 ) study the framework , related concepts , key technologies , and the importance of mda 本文在深入研究mda架构的基础上,通过使用mda的优点来弥补当前构件技术的不足,提出了一种系统的、全面的基于mda的构件开发方法? ? mdac方法,其主要思想是融合模型驱动和构件的思想到软件开发生命周期的各个阶段,利用模型来开发构件,化构件开发为模型开发,化构件组装为模型组装,化构件实现为模型映射,化构件复用为高层设计的复用、模型的复用。
Two studies , namely development of employment projection model for strategic land use planning and commercial and industrial floor space utilization survey commenced in 2004 to develop models for long - term employment projections and to collect statistics for updating the parameters required for compilation of employment distribution projections 本署于二零零四年展开两项名为用于策略性土地规划的职位数目推算模型开发研究及工商业建筑物楼面空间使用情?统计调查的顾问研究。