黑龙江省高速公路ETC数据交换系统的设计与实现

根据黑龙江省ETC系统提出的功能需求,完成了数据交换系统的总体设计、各功能模块的详细设计,实现了ETC车道交易数据在车道本地数据库和车道业务逻辑控制子系统之间,以及车道客户端数据库和收费站服务器端数据库之间的数据交换。测试结果表明系统是高效可靠的。     

用VB和FastReport Studio制作电子照准考证

介绍了基于VB、FastReport Studiot和数据库制作电子照准考证的方法,对VB开发者运用FastReport Stu-dio开发报表具有一定的借鉴作用,同时提供了完整的电子照准考证制作应用实例。     

利用数据库通信在Authorware中实现问卷统计

在众多的多媒体开发工具中,Authorware是其中的佼佼者,很多人在进行多媒体开发的时候都会以它为首选。随着数据库技术的发展,在Authorware制作过程中,可以通过ODBC接口实现在Authorware中调用数据库。利用Authorware与数据库的通信可以轻松实现问卷统计功能,从而使多媒体程序更加的完美。     

关于高校毕业生就业数据库编制方法的研究与探讨

高校毕业生就业数据库编制工作量大,时间紧,任务重,责任重大,每逢毕业生离校临近之际,便是就业工作人员夜以继日地加班之时。本文介绍运用VF制作毕业生就业数据库,可以轻松完成就业数据库的编制。     

浅议SQL Server中死锁的产生和解决对策

针对SQL Server事务处理中出现的死锁现象进行了分析,并用一个实例构造出了死锁的情形,观察了SQL Server对死锁现象的处理。文中还提出了若干避免出现死锁现象的对策。     

移动数据库技术在无线扫描枪上的应用研究

目前,随着移动技术的发展,移动数据库技术已经越来越广泛地应用到人们的生活中,阐述移动数据库的概念、特点及发展状况,探讨移动数据库的主要核心技术,结合邮政系统中无线扫描枪系统对移动数据库技术的应用进行研究,并探讨系统下一步的研究方向.     

基于XML的作战仿真想定方案生成软件设计

作战仿真想定作为作战仿真中的假设性预案,是作战仿真系统的重要组成部分。目前在想定处理中存在的主要问题是对想定的格式和修改手段不统一,生成的仿真想定可读性和可移植性不好,影响了仿真系统的真实性和可信度。着眼于解决上述问题,本文设计的想定方案生成软件针对XML技术在数据表达、数据交换等方面的应用,从使用XML描述的想定信息入手,实现想定的读取、图形化显示、编辑和存储,使仿真想定数据的处理规范化,方便仿真数据交换,提高想定生成软件对仿真系统互操作性的支撑能力。     

From conceptual models to schemata: An object-process-based data warehouse construction method

Data warehouse modeling is a complex task, which involves knowledge of business processes of the domain of discourse, understanding the structural and behavioral system's conceptual model, and familiarity with data warehouse technologies. The suitability of current data warehouse modeling methods for large-scale systems is questionable, as they require multiple manual actions to discover measures and relevant dimensional entities and they tend to disregard the system's dynamic aspects. We present an Object-process-based Data Warehouse Construction (ODWC) method that overcomes these limitations of existing methods by utilizing the operational system conceptual model to construct a corresponding data warehouse schema. We specify the ODWC method, apply it on a case study, evaluate it, and compare it to existing methods.     

A manufacturing XML schema definition and its application to a data management system on the shop floor

Digitization for sharing knowledge on the shop floor in the machinery industry has been given much attention recently. To help engineers use digitization practically and efficiently, this paper proposes a method based on manufacturing case data that has a direct relation to manufacturing operations. The data are represented in XML schema, as it can be easily applied to Web-based systems on the shop floor. The definitions were made for eight manufacturing methods including machining and welding. The derived definitions consist of four divisions of metadata, work-piece, process and evaluation. Three divisions except for the “process” division are common to the manufacturing methods. The average number of elements for a manufacturing method is about 200. The represented schema is also used to convey knowledge such as operation standards and manufacturing troubleshooting on the shop floor. Using the definitions, a data management system is developed. It is a Web-based Q&A system, in which the engineers specify the manufacturing case data mainly by selecting from the candidates. Then, the system fills in the blank portions and/or shows messages to help complete the case data. The proposed method is evaluated through practical scenarios of arc welding and machining.     

基于纯XML数据库的SCL文件管理

介绍IEC61850系列标准中的变电站配置描述语言的文件结构,阐述系统的配置流程及各种数据文件的交换过程,提出在XML文件管理维护上采用纯XML数据库技术。直接将XML文本文件作为存储单元。创建2个索引文件,运用传统的B+树数据结构建立索引。针对XML文件的特性,采用XML路径语言XPath表达式的方法进行文件查询。