Paraconsistent database , which based on 4 - valued paraconsistent logic and relational data model , can effective manipulate two kinds of uncertain information 但以次协调逻辑与关系数据模型相结合而产生的次协调数据库能够有效地处理这两类不确定信息。
Based on the schema of the system of information integration , the dissertation presents a common data model ( jidm ) which is a relational data model based on java 在分析了信息集成系统的模式结构的基础上,本文提出了一种基于java的关系数据模型( jidm )作为集成系统的公共数据模型。
In the database designing , this paper researches the design method , which combines expended relational data model and object ? elational data model , and realized the graph and image database 在数据库设计中研究了使用扩展关系数据模型和对象关系数据模型相结合的设计方法并成功实现图形图像数据库。
Foundation of analyzing the inner relation between processing design and knowledge needed , using relation list , process knowledge data ' s expression & saving was realized 以此模型下工艺决策推理的实现为目标,用实体一联系法对工艺知识数据进行了分析、整理和结构设计,用关系数据模型实现了工艺知识的表达与存贮。
To furnish methords in combination with methords of life - cycle and rapidly prototype after analyzing and comparing , put to use idefix to contract an relations data model according to practice in hongta group 同时根据红塔集团erp管理的实践,采用idefix建模分析设计方法,构建出红塔集团物资供应计划的关系数据模型。
Based on the reference feature of object - relational data model and the query language , the join algorithm sort - loops , probe - loops and segment - join are proposed , their performance are analyzed and compared 针对对象关系数据模型和查询语言所支持的引用特性,设计了基于引用的连接算法sort - loops 、 probe - loops以及segment - join 。
And many learns proved that traditional relation data models could n ' t effectively describe the structure and semantic of data warehouse applications , and could n ' t meet the requirement of olap ' s applications also 很多研究表明,传统的数据模型(如关系数据模型)难以有效地表示数据仓库应用中的数据结构和语义,也难以支持olap的应用。
As virtual database uses relational data model , the paper makes a special effort to discuss query rewriting technology - rewriting queries using views and its conjunctive query , containment mapping under this model 基于虚拟数据库所采用的关系数据模型,着重探讨了该模型下的查询重写技术? ?利用视图重写查询以及基于其上的合取查询、包含映射等问题。
Based on the work - packaging model and the database technique , the paper establishes the relational data model of the projects in civil engineering . the model will provide a method to use the computers in the projects in civil engineering 以工作包模型和数据库技术为基础,建立了工程项目关系数据模型,为计算机技术在工程项目管理中的应用提供了一定的理论基础。
By analyzing the requirement of simulation and the framework , an object - relational data model which adapts to driver , vehicle , highway and environment simulation is established and the mapping principle and achieving method is studied on 从人车路与环境仿真系统的数据需求和体系结构出发,建立了适合人车路与环境仿真数据库的对象?关系数据模型,研究了其映射机制和实现方法。