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空间区域
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  spatial region
    Access control model of 2-D spatial region based on spatial index
    基于空间索引的二维空间区域访问控制模型
短句来源
    This dissertation summarizes all kinds of topological relationships and spatial operations, and uses the conception realms to design the data structure of spatial region objects, and devises the red、blue planar graph algorithm, and makes use of red and blue sweep-line algorithm to implement the spatial topological analysis operations on layers of region objects. At the end, further works and improvements are presented.
    本文 对空间拓扑分析操作进行了归纳总结,并且基于 Realms 概念探讨了空间区域对象的数据结构以及红蓝区域平面图算法,文章详细讨论了针对双层红蓝区域对象的各种空间拓扑分析算法的实现,最后是该类问题的进一步改进和构想。
短句来源
    The authorization and access request rules and constraints of spatial region access control were defined, and the method of spatial data access control was described in detail.
    给出了授权和访问请求判断的方法,建立了二维空间区域访问控制模型。
短句来源
  spatial regions
    A Survey of Analysis Methods of Topological Relations Between Spatial Regions
    空间区域拓扑关系分析方法综述
短句来源
    Constrained surface and constrained maximum empty-sphere convex polyhedron are introduced to compute triangulation in spatial regions.
    该文提出了约束曲面和约束最大空球凸多面体的概念,在此基础上设计了一种在空间区域上做约束Delaunay四面体剖分的算法。
短句来源
    The development of formal models of spatial relations is an important topic in spatial reasoning, geographic information systems (GIS) and computer vision, and has gained much attention from researchers during the recent years. In particular significant progress has been made in the models of topological relations between spatial regions.
    空间关系形式化模型的发展是空间推理、地理信息系统(geographic information systems,简称GIS)、计算机视觉等领域中的一个非常重要的主题,近年来受到相关领域研究者的极大关注,特别是在空间区域间拓扑关系模型的研究方面取得了很大进展.
短句来源
    The modeling of topological relations between spatial regions is an important topic in spatial reasoning, geographic information systems (GIS) and computer vision. The modeling of topological relations between fuzzy regions is getting more imperative and thus has attracted plenty of attentions from researchers.
    空间区域拓扑关系建模是空间推理、地理信息系统(GIS)和计算机视觉等领域一个非常重要的主题,模糊区域的拓扑关系建模正日益受到相关领域研究者的重视.
短句来源
    In many geographical applications, spatial regions do not always have sharply defined boundaries but frequently their interiors and boundaries are fuzzy.
    在很多地理实际应用中,模糊空间区域没有分明的边界,如何建模并有效表达空间模糊区域具有重要的研究价值。
短句来源
  “空间区域”译为未确定词的双语例句
    That RCC model, n-intersection model andclassification invariant model have the same classification capability of topologicalrelations between 2-dimensional spatial areas is proved;
    证明了 RCC、n-交集与分类不变量模型具有相同的 2 维空间区域拓扑关系分类能力;
短句来源
    That 4-intersection model isnecessary and sufficient for classifying topological relations between 2-dimensionalspatial areas is proved, then these 3 different methods are unified.
    证明了 4交集模型对于分类 2 维空间区域间拓扑关系的充分必要性, 从而将 3 种不同的研究方法统一起来。
短句来源
    Based on the background of the spatial data warehouse system of administration for industry and commerce in Dalian City and the Dalian City spatial data clearinghouse, focusing on the characteristics of spatial data warehouse, serveral key technologies are studied, which include the spatial data warehouse framework, spatial ETL, spatial range aggregate query and the application exploring in different application fields.
    本文以大连市工商管理空间数据仓库系统和大连市基础空间信息交换平台为实际应用背景,围绕着空间数据仓库具备的特点,对空间ETL、空间区域聚集查询索引结构以及系统平台的构建及行业应用角度,对空间数据仓库进行了深入的研究。 重点研究了以下内容:
短句来源
    Second, to study efficient indexing structure to support spatial OLAP efficiently.
    2) 提出了一个有效支持空间区域聚集查询的索引结构。
短句来源
    Then, the architecture of the spatial data warehouse system is provided with following three points: extending the spatial functions of data warehouse based on ComGIS, which include Geocoding component, spatial calculate and analysis components, map display components;
    综上所述,本文分别从空间ETL、空间区域聚集查询索引结构、空间数据仓库系统体系结构等方面对空间数据仓库进行了研究,在此基础上,设计并实现了一个空间数据仓库系统原型并成功应用于工商管理空间数据仓库系统和城市基础空间信息交换平台,为这些领域的决策分析和数据共享提供了有效的实现方式。 关键词:空间数据仓库;
短句来源
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  spatial region
The correlation of signals received from a spatial region heated above the ambient medium is measured.
      
The functions are shown to determine a natural basis for the expansion of CFHH functions in the considered spatial region.
      
It is shown that either the presence of a magnetic flux in a finite spatial region or jumps in the field strength are necessary to generate a global potential.
      
Statistics of particles (smoke aerosol in the atmosphere) reaching a prescribed spatial region are analyzed.
      
Collective Cherenkov effect and anomalous Doppler effect in a bounded spatial region
      
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  spatial regions
The main object of the study is the effect of the acoustic parameters of the sediment layer on the formation and structure of the spatial regions within which the diffraction focusing of the acoustic field takes place.
      
We determine the probabilities of Landau-Zener transitions in the spatial regions where under two-photon resonance conditions the quasienergies of the atoms approach one another by a small quantity.
      
The spatial regions in which these fluxes are particularly intensive at different stages of the discharge are determined.
      
Spatial regions and optimal orientations for surface acoustic waves in langasite, langanite, and langatate piezoelectric crystals are analyzed.
      
New optimal spatial regions and orientations that are promising for SAW-based devices are found.
      
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Query-by-pointing (QBP) is a kind of graphic interface between the userand the geometry model of parts, which enables the user to query informationabout the element stored in the model by pointing at its position on the screen.Almost every CAD/CAM system has its QBP-like user interface, for it isextremely visual, simple and easy to learn. The fact, however, is that paperspublished abroad mention very briefly the application of QBP-like methods,but none of them describes their algorithms in detail. Before stating...

Query-by-pointing (QBP) is a kind of graphic interface between the userand the geometry model of parts, which enables the user to query informationabout the element stored in the model by pointing at its position on the screen.Almost every CAD/CAM system has its QBP-like user interface, for it isextremely visual, simple and easy to learn. The fact, however, is that paperspublished abroad mention very briefly the application of QBP-like methods,but none of them describes their algorithms in detail. Before stating the special features of this paper, it is necessary to reviewbriefly the previous work done in this research area. A paper by Donald C.Beran of General Motors Institute entitled "Numerical Control Programming ViaComputer Graphics" describes a BOUNDARY SELECT procedure for 2-1/2-Dprofile; it requires the user to point out each element of a contour one afteranother. If one of them is missed, a boundary-broken error will occur, and itis often the case when two or more elements are smoothly linked to each other.An approach which enables the user to identify a surface from CSG model ofparts is given in paper[3]. To find the surface pointed at by the user, a rayis cast from the input point in the viewing direction, and the first surface thatintersects with such a ray will be reported as having been selected. Thismethod also makes mistakes sometimes, because there may be more than one sur-face intersecting with the ray, and the surface expected may or may not bethe first one that intersects with the ray. Another drawback is that the linearsearch of data structure will take a long time. on the basis of domestic practicein computer graphics NC programming, similar methods of man-machine interac-tion are also proposed, though the data structures and algorithms are imper-fect. And now we can turn to the special features of this paper. In this paper, the QBP algorithms and their data structures, given in NPUMaster's theses [1] and [2], are synthesized and generalized. A new datastructure and its QBP interface are put forward, to support the representationand query of 3D parts. This paper's geometric hit-detecting algorithm of elements combines the advantages of ray-surface-intersection method [3], and the hit-detecting procedure of segment picking [4,5]. Besides the Min-Max Box of ele-ments, an extent, not dependent on coordinates, is introduced and described inthis paper. In comparison with the previous algorithms, the new algorithm hasthe following characteristics: 1) The data structure is that of boundary representation. Because fewmodifications need to be made during NC programming, the storage structureis organized linearly. 2) Pseudo edges, which contain topological information without any geo-metrical data, are allowed in the data structure; for the tool path cutting the in-tersection curve between two surfaces can be generated directly from these twosurfaces. 3) The search time is minimized. By making full use of the topologicalconnectivity offered by the model of boundary representation, the range ofsearch is limited to the surfaces connected to the current surface, instead ofall surfaces in the data structure. Once the local search fails, a boundary-brokenerror will be reported automatically. And all machined surfaces are marked as"having been machined", to prevent them from being checked again. Thus, theaverage query time is roughly linear in relation to the local complexity of parts.Furthermore, an automatic query method, which combines the QBP algorithmand match procedure of the local structure patterns of parts[6, 7], is proposedto reduce the manual interruption during NC programming to a minimum.

本文提出了一种能充分支持2—5坐标零件图象编程的边界表示数据结构模式,并对图形实时指点查询算法作了进一步的推广。新算法充分利用了边界表示数据结构中的拓扑邻接关系,不仅缩小了对相邻元素的搜索范围,而且能在搜索失败时发现“边界断裂”错误;通过对元素作“已加工”标记,消除了对“已加工”元素的空间区域作重复的击中检测;此外,新算法还对几何元素的空间区域作了修改,以减小空间区域彼此重迭的概率和击中检测的计算量。因此,用指点查询方式建立人机图形交互接口,不仅快速、直观,而且简单、易学。

An incoherent optical system is proposed to implement fuzzy associative memory (FAM)neural network. By using spatial areaencoding technique and shadow-casting system, fuzzy matrix-vector max-min operation needed by FAM model is optically realized. The experimental results are also given.

本文提出一种模糊联想神经网络的非相干光学实现系统。利用空间区域编码技术和阴影投射系统,模糊联想存贮器所需的矩阵-矢量最大-最小合成运算可得到光学实现。给出了实验结果。

Based on the partial information of the machine vision system and a preprocessing approach,the uneven light field correcting,noise filtering and image segmentation presented in the defects detecting are discussed in the paper. With the background light field detection and compensation,the noise influence is effectively restrained by meams of adaptive window selection processing spatial domain and parameters correcting etc. With the accurately segmentation of image,at the same time the defect shape factors are...

Based on the partial information of the machine vision system and a preprocessing approach,the uneven light field correcting,noise filtering and image segmentation presented in the defects detecting are discussed in the paper. With the background light field detection and compensation,the noise influence is effectively restrained by meams of adaptive window selection processing spatial domain and parameters correcting etc. With the accurately segmentation of image,at the same time the defect shape factors are applied to the target recognition. The processing method described in the paper has a common significance for the practical machine vision detection system.

就产品缺陷自动视觉检测中普遍存在的非均匀光场校正,噪声滤除及图象分割等问题进行了讨论,提出一种基于系统及缺陷目标的部分先验知识的预处理方法,采用本底光场检测与补偿,用自适应窗口选择处理空间区域和参数校正等技术,有效地抑制了噪声的影响,在准确地分割出缺陷图象的同时给出缺陷形状因子用以目标识别。本文中所阐述的处理方法对实际机器视觉检测系统具有一定的普遍意义。

 
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