共查询到20条相似文献,搜索用时 46 毫秒
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定性空间表示与定性空间的研究与发展 总被引:3,自引:2,他引:1
1 引言空间推理是指利用空间理论和人工智能技术对空间对象建模、描述和表示,并据此对空间对象间的空间关系进行的定性或定量的分析和处理过程。在描述和推断空间对象间的空间关系时,要获得精确、定量的数据通常是不可能的或不必要的,在这种情况下,可能要用到关于空间关系的定性空间推理。定性空间推理是一个 相似文献
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在远程多维空间对象融合过程中,对象之间不一致的空间几何关系会导致观察者空间感错乱,从而造成空间对象融合的沉浸感缺失。为此,基于深度传感器获取的深度信息,克服现有融合方法操作复杂性高、可移植性差及准确率低等问题,提出一种基于几何规则的多维空间对象融合模型。建立背景深度恢复模型修复目标空间的深度缺失区域,设计多层几何表达模型,即几何块结构模型及邻域微结构模型,采用决策树方法恢复源空间前景区域的深度信息,基于彩色信息及深度信息得到几何一致的融合效果。实验结果表明,该模型能够有效降低时间复杂度,同时具有较高的精准度及鲁棒性。 相似文献
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刘晓霞 《计算机应用与软件》2001,18(8):56-59
本文简要介绍了一种新的知识表示方法-概念图;详细论述了概念图知识表示的机器内部实现方法以及在推理过程中如何实现概念图之间的匹配。 相似文献
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定性空间推理的研究与进展 总被引:6,自引:2,他引:4
定性空间推理是人工智能学科处理常识性空间知识的一种方法[l],其推理任务包括图:推导知识库中的隐含知识;针对给定的部分知识或特定的上下文回答询问;维护一致性;获取新知识特别是认知图;定性场景描述的可视化。 相似文献
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主要研究了三维空间中空间对象的关系表示,介绍了利用部分学理论和形态学理论定义空间球的方法.根据Bran-don Bennettd的RBG理论,定义了空间球的形态关系及判断方法,提出了空间球全等的公理系统,给出了利用空间球模型定性表示方向关系和距离关系的方法.智能体对空间关系的确定是通过空间球实现的,该模型为智能体在约束空间环境中的行动推理提供了一个新的表示方法. 相似文献
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空间网络间的空间关系的表示和推理 总被引:1,自引:0,他引:1
空间网络间的空间关系的表示和推理在空间数据库领域具有重要的意义.为了对复杂的空间网络间的空间关系进行定义和区分,首先提出了空间网络间的空间关系的谓词表示和交集模型表示方法,给出了空间网络间的空间关系模型的特征条件式和蕴涵条件式,进一步给出了空间网络间的空间关系的划分定理和推论;系统研究了空间网络间的空间关系的推理方法,针对空间网络间的空间关系推理特点,提出了推理相斥规则和推理蕴涵规则.研究成果为空间网络间的空间关系在空间数据库中的应用奠定了基础,极大地增强了空间数据库处理复杂对象的空间关系的能力. 相似文献
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Zhi-NongZhong NingJing LuoChen Qiu-YunWu 《计算机科学技术学报》2004,19(C00):70-70
拓扑关系是一种非常重要的空间关系,在地理信息系统(GIS)中,被广泛地应用于空间查询、空间分析和空间推理。目前,已经提出了多种模型来对空间对象间的拓扑关系进行描述。在GIS中,空间对象包括单一(简单或复杂)的空间对象、同构的几何集合对象和异构的几何集合对象。目前国际上 相似文献
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定笥空间住是的分层递阶框架 总被引:1,自引:0,他引:1
定性空间推理是定性推理和空间推理的重要组成部分,拓扑和形状是定性空间推理研究的关键问题,针对定性空间推理已有一般框架存在的问题,提出了定性空间推理的分层递阶框架,并结合拓扑和形状方面的定性空间推理研究工作阐述了所提出的框架的有效性和合理性,最后总结了分层递阶框架的要点并提出了基于该框架的进一步研究工作。 相似文献
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本文针对当前OODB存储技术的问题,提出了一种对象表示模式SBOS,通过把SBOS表示在运行逻辑,内存结构和外存库上同构映射,能避免在I/O时对象格式转换和重组,特别是能同时高效地支持对象的各种计算模式,支持对象结构的复杂性和非重编译性类系统的扩充,同提供了实现应用制导的对象存储结构优化的基础。 相似文献
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空间对象管理系统结构与模型 总被引:3,自引:0,他引:3
近年来数据库技术迅速地进入了空间信息处理领域,如地理信息系统、地图数据管理、交通、航运系统等,这些领域涉及很多空间对象,包括大量的图形、图象、文字以及拓扑关系等复杂对象,传统的 DBMS 如 Oraclo、Informix、Unify 以及 dB-ase 系列,都只能处理整型、实型、字符、 相似文献
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基于用户自添加规则的自动推理程序 总被引:2,自引:0,他引:2
郭四稳 《计算机应用与软件》2007,24(9):48-50
基于前推搜索算法的自动推理软件近年来相继出现,该类软件利用几何定理可读证明的特性,和用户进行交互解题.但这类软件都是将推理的规则作为内置函数处理,用户只能选择软件提供的规则进行推理.设计了用户可添加规则的算法,即用户可以将自己的知识作为规则添加到软件中来进行推理.该算法已被编制成程序. 相似文献
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Many geographical applications have to deal with spatial objects that reveal an intrinsically vague or fuzzy nature. A spatial object is fuzzy if locations exist that cannot be assigned completely to the object or to its complement. Spatial database systems and Geographical Information Systems (GIS) are currently unable to cope with this kind of data. Based on an available abstract data model of fuzzy spatial data types for fuzzy points, fuzzy lines, and fuzzy regions that leverages fuzzy set theory and fuzzy point set topology, this article proposes a Spatial Plateau Algebra that provides spatial plateau data types as an implementation of fuzzy spatial data types. Each spatial plateau object consists of a finite number of crisp counterparts that are all adjacent or disjoint to each other, are associated with different membership values, and hence form different plateaus. The formal framework and the implementation are based on well known, exact models and implementations of crisp spatial data types. Spatial plateau operations as geometric operations on spatial plateau objects are expressed as a combination of geometric operations on the underlying crisp spatial objects. This article offers a conceptually clean foundation for implementing a database extension for fuzzy spatial objects and their operations, and demonstrates the embedding of these new data types as attribute data types in a database schema as well as the incorporation of fuzzy spatial operations into a database query language. 相似文献
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Younghyun HanAuthor VitaeKunwoo LeeAuthor Vitae 《Computer aided design》2002,34(11):835-848
This paper presents a novel approach to qualitative spatial reasoning about the spatial configuration of mechanisms that could be applied in the earlier phases of mechanism design. The basic idea in this approach is to predict all possible spatial configurations of a mechanism using sign algebra. This paper addresses spatial configuration problems of direction, position, and orientation of mechanisms. Spatial configuration matrices are introduced to describe and manipulate the spatial information of primitive mechanisms. Using these matrices, the overall spatial configurations of a complicated mechanism are constructed and then they are expressed by spatial configuration state matrices. These matrices are composed based on sign algebra and used to reason about all possible spatial solutions of a mechanism. The qualitative spatial reasoning proposed in this paper could provide useful prior information on the spatial configuration of mechanisms earlier in the conceptual design of mechanisms. The proposed approach is illustrated with a design example. 相似文献
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Clustering is an important concept formation process within AI. It detects a set of objects with similar characteristics. These similar aggregated objects represent interesting concepts and categories. As clustering becomes more mature, post-clustering activities that reason about clusters need a great attention. Numerical quantitative information about clusters is not as intuitive as qualitative one for human analysis, and there is a great demand for an intelligent qualitative cluster reasoning technique in data-rich environments. This article introduces a qualitative cluster reasoning framework that reasons about clusters. Experimental results demonstrate that our proposed qualitative cluster reasoning reveals interesting cluster structures and rich cluster relations. 相似文献
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Conventional design support software tools cannot effectively manage the complex, heterogeneous information used in engineering and architecture (EA) tasks. Crucially, despite uncertainty being an inherent quality of EA information particularly in the early stages of a design project, current tools solely rely on numerical approaches which do not support such incomplete and vague information. In this paper, we establish a complete framework for developing qualitative support tools that directly address these shortcomings. Our framework is application oriented and addresses the broader issues surrounding the actual use of qualitative methods. It provides design principles and strategies that allow a software engineer to develop custom qualitative software tools according to their specific EA task specifications. Our framework also provides the engineer with practical theory and guidelines for implementing their custom qualitative model and validating their system using context specific test data. We demonstrate the validity of our framework by presenting a case study in architectural lighting in which a prototype qualitative reasoning engine successfully automates qualitative logic about the subjective impressions of a lighting installation. 相似文献
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关系型数据库是目前管理数据最有效的方式,但传统的关系模型却无法描述现实世界中存在的复杂空间对象.在研究了关系数据库扩展技术的基础上,以通用商用数据库为基础,在扩展的关系数据库中描述空间对象并使用SQL进行空间对象运算,为如何在关系数据库中处理空间对象提供了思路和方法. 相似文献
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