用VB开发基于SQL-SERVER的C/S软件的解决方案

以应用为切入点,介绍用VB开发基于SQL SERVER的C/S软件中的系统配置、前后台连接、数据访问等实际问题的解决思路及实例.对数据库控件、数据库访问对象及ODBC三种数据库访问方法进行比较分析,得出在气象业务C/S应用系统开发中,ADO数据访问方法是一种较佳的选择.     

Variable-scale Topological Data Structures Suitable for Progressive Data Transfer: The GAP-face Tree and GAP-edge Forest

This paper presents the first data structure for a variable scale representation of an area partitioning without redundancy of geometry. At the highest level of detail, the areas are represented using a topological structure based on faces and edges; there is no redundancy of geometry in this structure as the shared boundaries (edges) between neighbor areas are stored only once. Each edge is represented by a Binary Line Generalization (BLG)-tree, which enables selection of the proper representation for a given scale. Further, there is also no geometry redundancy between the different levels of detail. An edge at a higher importance level (less detail) does not contain copies of the lower-level edges or coordinates (more detail), but it is represented by efficiently combining their corresponding BLG trees. Which edges have to be combined follows from the generalization computation, and this is stored in a data structure. This data structure turns out to be a set of trees, which will be called the (Generalized Area Partitioning) GAP-edge forest. With regard to faces, the generalization result can be captured in a single tree structure for the parent-child relationships—the GAP face-tree. At the client side there are no geometric computations necessary to compute the polygon representations of the faces, merely following the topological references is sufficient. Finally, the presented data structure is also suitable for progressive transfer of vector maps, assuming that the client maintains a local copy of the GAP-face tree and the GAP-edge forest.     

海洋台站数据采集系统服务器端软件设计

海洋台站数据采集系统逐渐由单机系统向服务器集中管理方式过度，通过分析海洋台站的需求，确定了基于SQL SERVER数据库的海洋台站数据采集系统服务器端软件的设计；上位机软件通过专网采用TCP连接与采集器进行通讯，基于线路的复用以及无线传输网络的特点采用了改进的轮询策略；对接收的信息解码后将采集数据进行量程转换并存入数据库，由于不同站点、不同采集参数区别较大，根据参数类型建立不同数据表存储数据；通过异常处理的设计增加了系统的稳定性和可维护性，整个系统操作简单，可动态增加修改站点信息，使用方便。     

新形式下柳州网络安全体系建设

通过对柳州网络拓扑结构的优化,构建相对安全的网络环境,以保障柳州气象业务的稳定运行.     

基于WINDOWS2000的WEB站点安全经验介绍

本文介绍基于WINDOWS 2000、SQL 2000和ASP建立网站时,存在的一些安全隐患,及应当采取的一些措施,对网站的安全防护建设有参考价值.