This study has designed and built non - point source pollution spatial database of the three - gorge reservoir area in chongqing based on geodatabase and case tools . the study has also workout the corresponding metadata standard and built non - point source pollution metadata . at last . this study assessed the non - point source critical area applying environmental model 本文基于geodatabase数据模型应用case工具设计、建立了重庆市三峡库区农业面源污染空间数据库，编制了相应的元数据标准并构建了重庆市三峡库区农业面源污染元数据，最后就三峡库区的农业面源污染应用环境模型进行了危险性评价。
To counter development and current application situations of open access , this paper has proposed issues that must be solved during the future development of open access , including the funds , quality guarantee , intellectual property , quality evaluation , social identity , metadata standard and interactive manipulation protocol as well as multiple database searching system , etc . it also makes a concrete analysis about the current situation of these problems , and discusses some possible solutions to them 针对开放获取的发展与应用现状,提出了开放获取未来发展中需解决的若干问题,包括运作费用、质量保证、知识产权、质量评价、社会认同度、元数据标准与互操作协议及跨平台检索系统等,并具体分析讨论了这些问题的现状及可能的解决方案。
According to information resource in existing library , the paper puts forward standard metadata draft of science and technology documents , the metadata analysis of reader information , and the architecture of metadata application system and relative technologies in digital library 针对当前图书馆资源的情况，文章还提出了适应图书馆自动化的科技文献资料的元数据标准草案和读者信息的元数据分析，以及在数字化图书馆中元数据应用系统的体系结构与采用的相关技术。
Combining operation of new way of safety management in hengdaohezi branch of train affairs , the thesis explains some new methods , such as adding up of a hundred safety marks , check of joint liability and linear management , and analyzes thoroughly management information system of safety statistics for branch of train affairs in analysis on system demand , analysis on system structure and function , and analysis on system data and data process . in the system , data standard of two " two violation " accident of workers and leaders is classified into three levels a , b and c , which is convenient to computer management 2 、结合横道河子车务段安全管理新办法的实施，论述了安全百分累计、连带考核、线性管理办法的基本思路和内容，从系统需求分析，系统组织结构与功能分析，系统数据与数据流程分析等方面，对车务段安全统计管理信息系统进行了详细分析设计，将职工、干部“两违”事故数据标准分为a ， b ， c三类，便于使用微机管理。
The author mainly does the following work : the construction of optical database ' s mainframe and the decision of design scheme ; the designs of concept structure model , logic structure model , physics structure and safety structure after the analysis of system demand ; the classification of optics which is adapted to search optical papers is advocated ; in order to solve the problems of converting heterogeneous data , the optical standards are designed ; the data input program of c / s architecture for optical database is developed , the work of inputting data and simply management of database can be done by this program 作者重点作了以下工作： ?构造了光学数据库的主体结构和设计方案； ?经过系统需求分析，对数据库进行了概念模型设计、逻辑设计以及数据库的物理设计、安全性设计； ?提出了适合光学论文查询的光学学科分类； ?为了能解决异构数据的相互转换问题，尝试性制定了光学的元数据标准。 ?用visualc + +语言开发了c s模式的光学数据库的数据录入程序，该程序能进行数据录入和简单的数据库管理。
With the rapid development of internet , digital library information resources are increasing with geometric series . in the face of tremendous amount of network resources , how to organize and describe digital library information resources so as to readers can find and utilize them expediently , is a problem that the librarians must solve urgently . firstly , this article describe the digital library information resources is different of other resources . it has its only orgnize and orgnize way . secondly , standards and specifications in the contents creation and resources description can be created in the course of the building of digital information resources . in these days , there are many metadata schemas in organizing digital library information resources . metadata schemas for resources description and domain specific markup languages have evolved dramatically during the last several years . this paper analyzes and discusses several metadata schemas . dublin core has been dramatically applied to the libraries for its advantages 随着internetr的讯猛发展，数字图书馆信息资源呈几何级数增长。面对浩如烟海的网络信息资源，如何来选择一种对数字图书馆的信息资源进行组织与描述的标准，以方便读者查找和利用，成为图书情报学界急待解决的问题。本文首先介绍了数字图书馆信息资源不同于其它的信息资源的特点，提出数字图书馆信息资源有自己独特的组织原则与组织方式；其次，在数字图书馆信息资源的建设中，在内容创建和资源描述方面时应遵循相应的标准规范，目前存在的多种组织数字图书馆信息资源的元数据标准，其中以处理文献资源为基本目的的元数据标准和专业置标语言近年来都在以前所未有的速度向前发展。
In addition , b ds should contribute data elements that have potential for reuse in other projects for concerted alignment , participate in task forces where we debate over the data elements , and most important of all , should adopt the data standards generated from the data alignment exercise 此外，部门如预计一些数据元素可能会在其他项目再次使用，应向可扩充标示语言协调小组提交那些数据的规格，并参与该数据元素的协调工作。当然，最重要的是部门应该使用经过协调的数据标准。
We first review the current situation of metadata technology , and point out the tendency of close combination of metadata technology with computer technology and g1s technology . then we conclude the relevant concepts of geospatial metadata , and study its contents and hierachical structure by comparing two most influential metadata standards . also we analyze three existing systems with emphasis on their architectures and implemental strategies 论文首先回顾了元数据技术研究的国内外现状，指出元数据技术与计算机技术、 gis技术等紧密结合的发展趋势，总结了空间元数据的相关概念，并通过对国际上最具影响力的两个空间元数据标准的分析和比较，研究了空间元数据的内容组成和结构。
