free-form data 中文意思是什麼
free-form data
解釋
自由形式數據, 自由型數據-
In the thesis. reading the iges file - 3 - and all the geometry entities and annotation entities are extracted ; on the base of geometry entities extracted, geometry entities are classified based to their three views. a new data structure is proposed to describle 3d form features ; inspection items of the workpiece are recognized ; the cmm - based inspection planning system is built ; on the other hand, as a part of cims, cmm need exchanging data with the software of cad / cam, so iges export interface is developed based on iges standard. in order to show the whole information of the surface, the 3 - dimensional free - form surface is drawing using the opengl
通過讀取iges文件對實體進行分離、提取、識別出對工件進行描述的原始信息；在此基礎上，西安理工大學碩士學位論文提出一種優化演算法對三視圖自動進行分離，建立了一種對工件進行三維描述的數學模型，照此模型對工件進行立體重構；識別出工件的各種檢測信息，提出一種對公差信息進行描述的數學模型，井與三維立體相結合，生成有檢測意義的三維實體；根據三坐標機的測量系統，生成相應的檢測規劃；另一方面，作為cmis的一部分，應具有與cad cam軟體之間的數據交換功能，本文還開發了iges輸出介面，採用opengl繪制三維空間曲面，向用戶展示其全面信息。 -
After analyzing deeply the present situation of such system in china, author has emphasized the professional use in designing management information system of urban planning and land use file. according to the property, characteristic of the xi " an institute of survey itself and the main technological prop - up of gis functional particularity to determine the system " s developing designed target in detail. needs to research the duty data and integrated management of drawing - piece information, to develop network illustrating inquiring, indexing or operation in view of computer network to design developing user covering for friendship video ability to achieve the planned supervision data and the integrated administration of drawing - piece information, illustrating inquiring by network and handle - case by project network, to form integrated illustrating data storage in view of computer network circumstances, to satisfy the demand of city land use administration, to make the system give free rein to proper role during the user in operation, to make the system give free rein to proper role during the user in operation on the particular duty
作者通過對國內同類系統建設情況進行了較為詳細的研究后，認為設計規劃用地檔案管理信息系統應以強調業務化與實用性為主，根據西安勘測院自身的工作性質、特點及作為系統主要技術支撐的gis功能特性來具體設定系統的開發設計目標，研究業務數據和圖件資料的集成管理模式，發展基於計算機網路的聯網圖文查詢、檢索和操作，設計開發友好的可視化用戶界面，實現規劃管理業務數據和圖件資料的集成管理、聯網圖文查詢以及項目聯網辦案，形成基於計算機網路環境的圖文集成數據庫，滿足城市用地管理的需要，使系統能在用戶的具體業務運作中發揮其應有的作用。 -
Control to create a free - form layout for a data record
控制項創建任意形式的數據記錄布局。 -
Control is that you can create a free - form layout for the data
控制項的優點是可以為數據創建任意格式的布局。 -
Firstly the thesis expatiates the basic concept of reverse engineering, analyzes the basic principle of reverse engineering, the technology & theory of three dimensional measuring and basic theory of building 3 - dimensional free - form surfaces model. secondly it introduces the smooth methods of the free - form surfaces of auto body and solves point - data and surface reconstruction. finally the thesis expatiates applications and technology of auto body of futian heavy truck through reverse engineering
本文首先將闡述逆向工程的基本概念，分析車身逆向工程的基本原理以及車身逆向工程中三坐標測量技術與原理，車身表面三維數學曲面模型建立的理論基礎，其次介紹車身外形曲面光順方法，以及車身逆向工程中點數據處理技術及曲線曲面重建技術，最後結合福田重卡車身逆向開發，重點闡述車身逆向工程技術的應用與流程。 -
The parts reverseeng ineering deals with mostly have freeform surfaces. the regeneration of the free form surfaces is the main task of reverse engineering. in this paper some key techniques for nurbs surface reconstruction in reverse engineering such as b - spline curve fitting, b - spline surface fitting to scattered data, b - spline surfa ce fitting to contour data and b - spline curve fairing are studied
本文研究了逆向工程中b樣條曲面重構的關鍵技術，包括b樣條曲線的擬合、散亂數據的b樣條曲面擬合、逐層掃描數據的b樣條曲面擬合以及b樣條曲線的光順。 -
We also place emphasis on research of apriori and fp - growth algorithm and compare the performance of two algorithms. secondly, we do research on concepts of structured and nonstructured data, actual state and problems of tree structure mining, and freetreeminer algorithm theory. we also study canonical form and pre - processing technologies of free - tree, concepts and properties of closed and maximal tree, and pruning, growing and mining of tree structure
其次，研究了結構化與非結構化數據的基本概念、樹結構挖掘的研究現狀、現有樹結構挖掘技術存在的問題、 freetreeminer演算法及其基本思想，重點研究了free樹的規范化和預處理技術、封閉頻繁子樹和最大頻繁子樹的概念和性質、樹結構的剪枝和生長技術、樹結構的挖掘技術。
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