hierarchical database model 中文意思是什麼
hierarchical database model
解釋
層次結構數據庫模型- hierarchical : adj. 1. 僧侶統治（集團）的。2. 統治集團的。3. 等級（制度）的。adv. -cally
- model : n 1 模型，雛型；原型；設計圖；模範；（畫家、雕刻家的）模特兒；樣板。2 典型，模範。3 （女服裝店僱...
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Requirements analysis, system frame design, algorithm design, code compile and software test of protection setting verifying and analysis system of sub power system are all accomplished. main research work of this paper is concentrated on three respects : ( 1 ) knowledge expressing of mathematic model and physics model of power system using relation database and object oriented language, ( 2 ) new methods of in - substation topology and net topology analysis based on topology of hierarchical model, ( 3 ) father research of protection coordination considering difference of protection setting verifying and fixing
論文提出了進行保護定值在線校驗的意義和方法，並按照軟體工程的規范化開發的要求，完成了滄州地區電網保護定值在線校驗分析系統的需求分析、系統框架設計、演算法設計、代碼編寫和軟體測試的大部分工作，主要的研究工作集中在： （ 1 ）利用關系數據庫和面向對象語言對電網進行物理模型和數學模型上的知識表示。 -
Algorithm design based on hierarchical model database
基於層次模型數據庫的演算法設計 -
After analyzing the information integration among capp > pdm and erp, this paper propose a system framework for the information integration between capp and erp through shared pdm database, the levels of information integration are also presented. then, broadly combining with the last research achievements of information integration theory and method and synthetically considering technical advancement and practical needs of domestic medium and small - scale enterprises, advanced and analyzed four plans to solve the integration. after the change of product data model during different stages of design and manufacturing are studied, the paper introduces a new technology using object - oriented, hierarchical model to building product data model
本文首先對capp 、 pdm 、 erp之間的信息集成作了分析，建立了基於pdm系統實現capp與erp的信息集成的體系結構與集成環境，劃分了設計信息集成的層次；結合國內外信息集成理論及方法的最新研究成果，綜合考慮技術上的先進性和國內中小企業的實際需要，提出並分析了四種解決集成問題的方案；在研究了產品數據模型在設計與製造過程不同階段的變化后，提出了採用對象、層次化建模技術；在統一數據模型的基礎上，以工藝設計bom為紐帶，實現capp erp系統集成的方法，最後給出了應用實例。 -
The history of the development of database technology can be divided into three phases : the first generation is the reticulation / hierarchical data model based on database ; the second generation is the relational data model based database ; the third generation database which has the object oriented character breakthroughs the localization of the traditional database model which is unable to build model based on complex data structure. the third generation has led the database system to a new time
數據庫技術的發展經歷了三個階段：第一代數據庫系統是基於網狀、層狀數據模型的網狀、層狀數據庫管理系統；第二代數據庫是基於平面關系模型的關系數據庫系統；以面向對象模型為代表的第三代數據庫系統突破了傳統數據模型在復雜數據建模和管理方面存在的局限性，使數據庫系統進入了新的時代。
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