on-line data bases 中文意思是什麼
on-line data bases
解釋
在線數據庫-
The structural framework of the on - line test system has been built in the paper, based on j2ee and xml. uml is integrated into the development of web application in virtue of rose to get visual system model. the system requirements and design models are defined by uml diagrams such as use case diagram, class diagram, sequence diagram, collaboration diagram, component diagram, and deployment diagram. web pages, component objects, data tables and databases are all regarded as a class or an object. the modeling process bases on the views of real world. the design and development process is established according to the views of software engineering. the online examination system which bases on j2ee can fully use the jsp 、 javabean 、 servlet 、 xml, flexibility of three - tier model to optimize the system performance and to enhance. the development value
同時藉助rose工具將uml語言和web應用開發結合起來，進行可視化建模，利用uml的用例圖、類圖、時序圖、合作圖、組件圖和部署圖等，定義系統需求，描述系統設計，將web頁面、組件對象、數據表和數據庫都作為類或對象，按照真實世界的觀點進行建模，依據軟體工程學的觀點制定設計開發步驟。本系統以j2ee體系結構為基礎，充分利用jsp 、 javabean 、 servlet 、 xml組件和三層模式的靈活性來簡化開發過程，優化系統性能，從而提高了系統的開發價值。 -
This paper uses digital line graphs for original data. after author bases on large - scale relief map " feature and analyses the feature, data structure and creation algorithms of two main representation shape ? triangulated irregular network and regular grid, author provides a kind of method that large - scale dem is created from tin which is created from large - scale dlg
本文以數字線化圖為原始數據，針對大比例地形圖的特點，在分析了數字高程模型的兩種主要表現形式? ?不規則三角網tin和規則格網grid的特點、數據結構、生成演算法的基礎上，考慮到大比例尺數字高程模型能最大限度符合實際地形特點，提出了一種從大比例尺數字線化圖dlg生成不規則三角網tin ，再由不規則三角網內插生成大比例尺數字高程模型grid的方法。
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