| 题名 | 电子数据交换系统理论与应用研究 |
| 作者 | 陈国威 |
| 学位类别 | 工学博士 |
| 答辩日期 | 1995-09-01 |
| 授予单位 | 中国科学院自动化研究所 |
| 授予地点 | 中国科学院自动化研究所 |
| 导师 | 郑应平 ; 王林 |
| 关键词 | 电子数据交换 数据库模式等价 EDI文件转换 系统分析 EDI翻译系统 Electronic Data interchange Equivalence of database scheme EDI data conversion System analysis EDI translator |
| 其他题名 | Electronic Data Interchange-Theory and Application |
| 学位专业 | 控制理论与控制工程 |
| 中文摘要 | 信息高速公路的发展，推动了计算机网络通信在各领域的广泛应用。无论 在国外还是在国内，异构计算机系统之间的数据通信和数据处理越来越多，但 是文件格式的不同给异构系统的数据交换带来许多问题，本文系统研究了电子 数据交换从理论到应用的一系列问题。 电子数据交换，无论是工业设计和制造系统中的产品数据交换，还是商 业、行政和运输业的贸易数据交换，或是办公室数据的交换，都涉及到数据库 模式的转换问题。数据库模式的等价性直接关系到两个数据库模式能否进行 正常的数据转换，它是数据库模式转换的基本问题。本文从数据库完备查询的 角度定义了数据库模式的等价，给出了模式等价的一些性质和判定方法。 在详细分析了EDI交换的结构和EDI文件转换的基础上。重点研究了EDI文 件转换的核心—映射和翻译过程。映射过程的任务是完成用户文件和标准报 文之间的结构转换。本文从数据库模式等价的角度分析了映射过程，用基于表 格的方法建立了映射参考，针对用户文件与平文件的等价情况，分析了建立映 射参考所要考虑的问题，并给出了解决的方法。 本文研究了EDI平文件与EDI标准报文的相互翻译，给出了翻译过程中需 要的一些算法。对文件转换中的其它问题，如报文的成组、解组、总装和分组 过程也进行了分析，讨论了生成服务数据段的过程。 EDI系统的实施需要多种技术支持，涉及许多学科领域。在实施过程中需 要分析许多问题，正确的分析步骤和分析方法，是保证EDI系统顺利实施的关 键，可以节省人力物力，并缩短系统建立的时间，保证系统的正常运行。本文 提出了EDI实施的过程分析模型，研究了系统实施过程中一系列问题，该模型 可为EDI服务提供者和用户提供理论指导和分析方法。 分析了EDI系统在企业信息系统和跨组织信息系统中的位置，提出了 以EDI系统为网关(Gateway)将各企业信息系统集成为跨组织信息系统的结 构框架。同时从Client／Sever角度研究了EDI系统和管理信息系统的关系，讨论 了EDI系统和MIS系统的集成，分析了EDI系统对企业信息系统的影响。 翻译系统是EDI软件系统的核心，EDI翻译软件的开发在我国尚属空白， 开发适合我国国情的能够支持汉字系统的软件还是很有必要的。基于本文的研 究工作、对国外翻译软件的分析以及和一些用户的探讨，我们开发了EDI翻译 系统原型，该系统支持汉字系统，可以操纵多种数据库，可以实现开放数据库 联接(ODBC)，具有可视化特点，界面友好，具 |
| 英文摘要 | Communication through computer network is widely used in many fields with the development of information highway. More and more data communication is applied between heterogeneous computer systems. But the difference of message format make it difficult for computer to deal with the transaction from partner automatically. This paper has studied a series problems about electronic data interchange (EDI) from theory to application. Electronic data interchange can be used in industrial design and manufacturing system as product data interchange, used in administration, commerce and transport as commercial EDI, or used in office data interchange. No matter where used, it faces the problem of converting data from one database scheme to another - namely data converting. The equivalence of two database scheme concerns whether or not the two database scheme can interchange data freely without loss. It is a basic problem of data converting. This paper has defined the equivalence of database scheme from the point of complete query instead of the project-join view of [berri, 1981]. Some character and theory are concluded about scheme equivalence. Part of them can be used to determine the equivalence of database. The architecture of EDI interchange is analyzed, and the procedure of EDI data conversion is studied, especially the main procedure mapping and translating. The task of mapping procedure is converting data architecture between application file and EDI standard file. We have studied this procedure in the view of equivalence of database scheme. A form oriented method is given for building mapping reference, and the problems encountered during the procedure is studied. To different equivalent case between application and EDI flat file, solutions are given to build mapping reference, and then to map application file and EDI flat file to each other. The translating procedure is investigated between EDI flat file and EDI standard message. Some algorithms are given for the translation. In addition, some problems encountered in EDI translation is also considered , that is group, ex-group, interchange making up and interchange separating. A system analysis model is proposed for the implement of EDI. The implement of EDI needs many technical support associated with many fields. A proper analysis method can save time, money and human resource. The model proposed here takes some typical problem into account, and can be used as a guidance to implement EDI. A structural framework is proposed which describes the relation between EDI and interorgnization information system(IOIS) . As a protocol of application level described in open system interconnect(OSI), EDI can take the role of gateway which integrates heterogenous information systems into IOIS. The problem is consulted about how to deal with the relation between EDI system and Management information system, and how to integrate them tog |
| 语种 | 中文 |
| 其他标识符 | 334 |
| 内容类型 | 学位论文 |
| 源URL | [http://ir.ia.ac.cn/handle/173211/5653]  |
| 专题 | 毕业生_博士学位论文 |
| 推荐引用方式 GB/T 7714 | 陈国威. 电子数据交换系统理论与应用研究[D]. 中国科学院自动化研究所. 中国科学院自动化研究所. 1995. |
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