- 邏輯數(shù)據(jù)模型
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logic data model中文什么意思
例句與用法
- The distribution gis data management methods and its application in distribution running are systematically researched , which compose distribution gis network topology analysis ( nta ) and optimal rush - maintain path ( orp ) , and distribution planning , which composes distribution spatial load forecasting ( slf ) : ( 1 ) with systematic analysis on the relationship between spatial data model and spatial data structure , the distribution feature and the two common gis data models are analyzed , which are vector and raster data models . then the conceptual and logic data models of distribution gis are designed . the spatial data storage structure is given by using vector method , and their detailed data management methods are proposed
（ 4 ）將gis的空間信息分析功能應(yīng)用于配網(wǎng)空間負(fù)荷預(yù)測(cè)（ saptialloadforecasting ， slf ）的研究：綜合利用灰色理論及遺傳規(guī)劃的優(yōu)點(diǎn)，提出了一種根據(jù)饋線的歷史峰值負(fù)荷進(jìn)行外推的組合slf法：首先采用負(fù)荷轉(zhuǎn)移耦合法來修正負(fù)荷歷史，消除由于負(fù)荷轉(zhuǎn)移引起的誤差；然后根據(jù)實(shí)際饋線路徑和配網(wǎng)gis圖形分層，運(yùn)用圖層疊加分析得到饋線的實(shí)際供電范圍；接著采用灰色關(guān)聯(lián)度聚類方法對(duì)饋線負(fù)荷增長(zhǎng)曲線進(jìn)行聚類分析；最后采用遺傳規(guī)劃來對(duì)灰色聚類結(jié)果進(jìn)行符號(hào)回歸，分別得到每一類曲線的最佳擬合曲線形式。 - It also discusses the realization of the system . meanwhile , beginning with the analysis of the need few the system , the thesis draws a data flow diagram , studies the entities and their relation involved in the system and sets up the concept data model . then it establishes a logic data model and opens up the managing system of the automatic storage & retrieval system d atabase supporting the internet structure of the client / database server by using sql server 2000 database system
同時(shí)，從啤酒自動(dòng)化倉庫管理系統(tǒng)需求分析入手，畫出系統(tǒng)的數(shù)據(jù)流圖，研究系統(tǒng)所涉及的實(shí)體以及實(shí)體之間的關(guān)系，建立概念數(shù)據(jù)模型，再建立邏輯數(shù)據(jù)模型，最后采用sqlserver2000數(shù)據(jù)庫系統(tǒng)開發(fā)了支持客戶機(jī)服務(wù)器網(wǎng)絡(luò)結(jié)構(gòu)的啤酒自動(dòng)化倉庫管理系統(tǒng)數(shù)據(jù)庫，為倉儲(chǔ)作業(yè)的實(shí)現(xiàn)和庫存管理提供數(shù)據(jù)存儲(chǔ)方面的支持。