面向存储与传输的手绘草图信息表示模型

草图信息的存储与传输是草图系统在信息共享乃至网络协同方面需要解决的问题,其核心在于草图信息的一致表示。本文从信息表示和信息传榆两个维度,建立了草图信息表示模型框架。该框架采用域模型思想,包括域属性、逻辑模型、转换模型、对象模型和控制模型,它们实现了草图信息的一致表示、统一管理和信息存储、传输。最后,从静态和动态两方面,对草图信息的建模过程进行了详细描述,给出了草图信息表示的 XML 实现策略,并对信息传输技术进行了分析。

基于本体的几何误差检验操作构建与推理

针对新一代产品几何技术规范与认证(Geometrical Product Specification and Verification,GPS)标准在实际工程中的应用程度较低、各操作之间难以集成使用、过度依赖检验者经验的问题,开展几何误差检验操作的本体构建与推理研究。根据新GPS检验操作和零件测量信息,建立几何误差检验操作信息表示模型,基于信息表示模型来构建相应的几何误差检验操作本体,接着采用语义网规则语言(Semantic Web Rule Language,SWRL)建立检验操作智能推理的SWRL规则,以实例在Protegé中验证该方法的可行性。

Field analysis of metallogenic information and its application

Focusing on the issue to deal with inadequate extraction of metallogenic information especially geological information,a new method of extracting metallogenic information based on field model,i.e.the field analysis method of metallogenic information,was proposed.In addition,a case study by using the method of the extraction of metallogenic information from the west Guangxi and southeast Yunnan district as an example was performed.The representation method for the field models of metallogenic information,including the metallogenic influence field model and the metallogenic distance field model,was discussed by introducing the concept of the field theory,based on the characteristic analysis of the distance gradualness and the influence superposition of metallogenic information.According to the field theory superposition principle and the spatial distance analysis method,the mathematical models for the metallogenic influence field and the metallogenic distance field of point,line and area geological bodies were derived out by using parameter equation and calculus.Based on the metallogenic background analysis,the metallogenic information field models of synsedimentary faults and manganese sedimentary basins were built.The relationship between the metallogenic information fields and the manganese mineralization distribution was also investigated by using the method of metallogenic information field analysis.The instance study indicates that the proposed method of metallogenic information field analysis is valid and useful for extracting the ore-controlling information of synsedimentary faults and manganese sedimentary basins in the study area,with which the extraction results are significant both statistically and geologically.

A ubiquitous knowledgeable data representation model(UKRM) for three-dimensional geographic information systems(3D GIS)

In the face of complicated, diversified three-dimensional world, the existing 3D GIS data models suffer from certain issues such as data incompatibility, insufficiency in data representation and representation types, among others. It is often hard to meet the requirements of multiple application purposes(users) related to GIS spatial data management and data query and analysis, especially in the case of massive spatial objects. In this study, according to the habits of human thinking and recognition, discrete expressions(such as discrete curved surface(DCS), and discrete body(DB)) were integrated and two novel representation types(including function structure and mapping structure) were put forward. A flexible and extensible ubiquitous knowledgeable data representation model(UKRM) was then constructed, in which structurally heterogeneous multiple expressions(including boundary representation(B-rep), constructive solid geometry(CSG), functional/parameter representation, etc.) were normalized. GIS's ability in representing the massive, complicated and diversified 3D world was thus greatly enhanced. In addition, data reuse was realized, and the bridge linking static GIS to dynamic GIS was built up. Primary experimental results illustrated that UKRM was overwhelmingly superior to the current data models(e.g. IFC, City GML) in describing both regular and irregular spatial objects.