分布数据库

Namely, using the centralized and distributed database design optimizes the configuration of simulation database of Air fleet fighting DIS system and ~duces network flux.

即利用集中和分布式的数据库结构对机群作战分布交互式仿真系统的数据库进行了优化设计，减少了网络数据流量。

Maintaining the data consistency is a critical technical problem in the distributed database system .

1引言分布式数据库系统在系统结构上的真正含义是指物理上分布、逻辑上集中的分布式数据库结构。

Management Information System, Geographic Information System, Client/Server, Distributed Database DDB

管理信息系统，地理信息系统，客户/服务器，分布数据库

In accQrdance with the concerned isomerism and distributivity of the database system in the long-distance education, and variety of database inter-connectivity technology, we law lessons from the successful application in TCP/IP communication protocol, and adapt to use the Layer thought to realize the share of distributive isomeric database information.

针对目前远程教育中所涉及的数据库系统的分布性和异构性，数据库互连技术的多样性，本文欲借鉴网络通信协议的成功之处，采用分层结构的思想去实现分布式异构数据库信息的共享。

Three centers of endemism were identified by overlapping distribution maps, namely the "Hengduanshan Mountain areas","Mountain areas in north Sichuan Province and Qinling as well as south Gansu Province", and "Taiwan Island".

在广泛搜集有关分布资料、对我国鸟类特有种的地理分布情况进行系统整理并建立数据库的基础上，运用GIS技术处理物种分布数据，研究了中国鸟类特有种的多样性及其分布格局。

This Memory Resident Database Supply these features: Definition of data(table、index、queue et), operation of data; synchronization of data: Data synchronous abilty is pivotal function to distributed DBMS(synchronization of static data, dynamic synchronization between master processor and slave processor); database power-on; Saving and Loading of database etc.

根据系统设计的要求该内存数据库提供以下功能：数据定义，数据操作（数据的插入、删除、修改、查询）；数据的同步机制：数据的同步功能是数据库系统保证分布、备份数据系统一致性的关键(各模块之间的静态数据同步、主备MP大量数据的动态数据同步、MP间动态数据同步)，其中本文主要介绍了主备MP的动态数据同步；数据库系统并发性控制。

Which are important in object-relational databases, and how to translate the select-from-where cause into representations of monoid system are discussed. We take into account the onedimensional and multidimensional data partition methods, physical storage structures and further more how to parallelize them.

本文讨论了对象-关系型数据库中的重要数据类型-集类型如表、集合等的有效实现；讨论了select-from-where查询语句在monoid系统中的表示方法，给出了多种一维／多维数据分布方法、物理存储结构及其并行化方法；系统地分析、设计并实现了并行数据库系统的数据库原语操作及其基本并行算法。

The paper mainly concerns about:(1)Proposing the idea of completing the job using GIS software by discussing deficiency of the traditional transportation job;(2)Discussing the transportation plan algorithm and the flow, in this foundation, designing the transportation model programming realization flow chart;(3)With the comparison of the domestic and foreign GIS software platform, determining ArcGIS Desktop which has large drawing edit and spatial analyse functions as the development platform of transportation planning;(4)In the data organization and the database establishment, by using the recent object-oriented spatial data— Geodatabase and UML, completing the system database design and establishment, including spatial database, attribute database as well as transportation network database

详细研究内容如下：(1)论述了传统交通规划软件存在问题，提出了利用GIS平台开发交通规划系统的基本思想；(2)论述了交通规划的算法和流程，在此基础上，设计了交通模型编程实现的流程图；(3)通过比较国内外GIS软件平台，选定了具有强大图形编辑和空间分析功能的ArcGIS桌面版为交通规划系统的开发平台；(4)在数据的组织和数据库的建立上使用新的面向对象的空间数据—Geodatabase，并利用统一建模语言UML完成了系统数据库的设计与建立，包括空间数据库，属性数据库以及交通网络数据库；(5)论述了系统编程实现的基本方法，在ArcMap下采用VBA编程方法自由地定制了系统界面；(6)利用ADO Data和数据网格控件存取交通规划系统预测功能所需的数据库；(7)采用VB对ArcObject控件扩展开发方式，实现系统功能的开发，即利用COM技术的扩展性在VB中创建ActiveX动态链接库来实现特定的系统功能，并集成在ArcMap中运行；(8)系统完成了交通发生预测、交通分布、缓冲区分析、道路的网络分析、公交

Based on 122 pieces of literatures on Castanopsis kawakamii searched from the CNKI database from 1979 to August 2009,this paper made a statistical analysis on the distribution of the research fields, publication time, journal categories, research areas and the number of authors.

统计分析了1979至2009年8月中国知网数据库中检索的122篇格氏栲文献的研究领域、时间分布、期刊分布、省份分布及作者人数构成等内容。

The distribution database and the geographic cladograms of the superfamily was set up. The distribution pattern of the superfamily was concluded and the origination centre of the superfamily was also discussed. We deduced that the South Asia is probably the origination centre of the superfamily. Two new index for zoogeographic analysis, index of high taxa distribution and the possibility index of the origination of a high taxa, were proposed.

应用Diva 软件研究了叶蜂总科族级支序生物地理，建立了地理分布数据库和地理支序图，拟合了叶蜂总科现代分布格局，推断出叶蜂总科的起源中心位于东亚南部，提出了两个新的地理分析指数—类元分布指数It和类群起源可能性指数Io。

With Death guitarist Schuldiner adopting vocal duties, the band made a major impact on the scene.

随着死亡的吉他手Schuldiner接受主唱的职务，乐队在现实中树立了重要的影响。

But he could still end up breakfasting on Swiss-government issue muesli because all six are accused of nicking around 45 million pounds they should have paid to FIFA.

不过他最后仍有可能沦为瑞士政府&议事餐桌&上的一道早餐，因为这所有六个人都被指控把本应支付给国际足联的大约4500万英镑骗了个精光。