A formal description of open distributed processing (ODP) trading based on guidelines for the definition of managed objects (GDMO)

New requirements of growing computer networks and information systems have an influence on extended client/server models with increased functionality. This forms the basis for service management in distributed systems which is realized by a service trading concept. This paper studies the requirements derived from the Open Distributed Processing (ODP) Reference Model in order to consider an open service market. Furthermore, it examines management possibilities for describing the service trading scenario. Because of similar architectures and properties ODP services, service offers, types, exporters and traders are mapped onto management components and modeled as managed objects. Therefore, the Guidelines for the Definition of Managed Objects (GDMO) are used. The final concept allows a precise and unambiguous study of the service trading scenario and provides means for exporting and importing of service offers in a distributed environment.     

An Object-Oriented Transaction Model

In object-oriented database systems(OOBSs),the traditional transaction models are no longer suitable because of the difference between the object-oriented data model(OODM)and the conventional data models(e.g.relational data model).In this paper,transction models for advanced database applications are reviewed and their shortcomings are analyzed.Exchangeability of operations is proposed instead of commuativity and recoverability for using more semantics in transaction management.As a result,an object-oriented transaction model(in short,OOTM)is presented.It is not modeled for some special application,but directly based on object-oriented paradigms.A transaction is regarded as an interpretation of a metho.Each transaction(even subtransactions)keeps relative ACID(Atomicity,Consistency,Isolation,Durability)properties,therefore the special problems appearing in OOBSs such as“long transactions”,“visibility of inconsistent database state”can be solved.     

基于混合高斯模型的目标差分自适应背景模型

提出一种自适应背景更新率的方法。在混合高斯背景模型基础上。通过混合高斯匹配将前后两帧分割出的运动目标作差分。差分后再次采用混合高斯匹配分辨出过去目标区和当前目标区。在背景更新的过程中,加大过去目标区的更新率,让运动目标在出现停滞状态时给背景模型带来的干扰区域得到快速恢复。试验结果表明,该方法有效地提高背景模型的鲁棒性。     

基于GIS的高速公路沿线设施管理信息查询系统的设计与实现

将GIS技术引入到高速公路沿线设施管理信息系统,实现沿线设备设施的可视化管理.并就如何在SuperMap平台下实现系统的查询功能进行了探讨.介绍了量子图形数据库,进行关键字段关联的方法实现图形与属性的互查,以及目标对象综合信息查询方法.利用SuperMap Objects 的相关接口函数开发了高速公路沿线设施管理信息查询系统,使用户准确定位并查询感兴趣目标的空间信息、属性信息和综合信息,从而在宏观上把握高速公路上的设备设施,辅助相关人员进行管理和决策.     

基于C/S架构的徐州市绿地信息系统设计与实现

在确立绿地信息分类和组织原则的基础上构建了徐州市绿地信息数据库,结合该数据库在VB开发环境下利用SuperMap Objects组件开发了徐州市绿地地理信息系统,该系统不仅具有缓冲分析、属性查询、模糊查询等地理信息系统功能,还具有界面简单、易于操作、可视化强的特点。系统的使用为提高徐州市绿地管理的信息化水平,城市绿地的规划、建设和管理提供了可视化的支撑工具。     

Visual Basic程序开发中数据库访问技术的探讨

Visual Basic是世界上使用人数最多的,微软公司开发的包含协助开发环境的事件驱动编程语言。它具有良好的图形用户界面（GUI）和强大的控件功能,并可以轻松地通过DAO、RDO、ADO等对数据库进行连接。该文主要对VB访问数据库的方案进行探讨．使用户从VB访问数据库的众多方法中,选择一种有利于开发人员与应用软件开发的方案,使用户能够更好了解VB的数据库编程功能．开发出的软件更具有现实的意义,而且适应该行业未来的发展。     

Extracting significant Website Key Objects: A Semantic Web mining approach

Web mining has been traditionally used in different application domains in order to enhance the content that Web users are accessing. Likewise, Website administrators are interested in finding new approaches to improve their Website content according to their users' preferences. Furthermore, the Semantic Web has been considered as an alternative to represent Web content in a way which can be used by intelligent techniques to provide the organization, meaning, and definition of Web content. In this work, we define the Website Key Object Extraction problem, whose solution is based on a Semantic Web mining approach to extract from a given Website core ontology, new relations between objects according to their Web user interests. This methodology was applied to a real Website, whose results showed that the automatic extraction of Key Objects is highly competitive against traditional surveys applied to Web users.     

LINQ数据库访问技术研究

LINQ是微软公司提供的一项新技术,LINQ查询操作可以通过编程语言自身传达,而不是以字符串方式嵌入到应用程序代码中.通过使用编程语言编写查询具有简化查询,不必使用单独的查询语言等优势.LINQ允许编写C#或者Visual Basic代码以查询数据库相同的方式操作内存数据,它改变了程序和数据之间的关系.因此借助于LIN...     

一种基于ASP在WWW上实现的数据库查询

在MicrosoftWindowsNTServer4．0上集成IIS,由ASP脚本启动ADO控作,通过ODB驱动程序,实现数据库服务器与Web服务器的连接,是在Internet上发布数据库的一种有效方法。该文介绍了一种用该方法实现通用数据库查询的程序设计技术,给出了源代码。     

基于SuperMap IS技术的Web GIS实现

探讨利用SuperMap IS技术构造Web GIS的方法,以及在此基础之上如何利用SuperMap IS提供给用户的客户端开发模版进行Web GIS开发.