Development of Highly Versatile Phase Diagram Database on the Object-Oriented Scheme

在构建高度通用的相图数据库服务时，可以利用面向对象的数据库系统的明显特征和功能。为了验证和验证这一期望，我们开展了以下工作：(1)从零开始开发了面向对象的数据库系统程序，并针对相图数据库服务进行了调整；(2)设计了相图数据库所需的类；(3)将100多张相图输入到数据库中；(4)开展了公共相图数据库服务。在本研究期间，对面向对象的数据库系统MOOD-SX进行了约150次的收集和改进，以实现进一步的通用性和更高的性能。其中包括图像文件的传输和显示，以及开发允许从流行的网络浏览器访问数据库的用户界面Java小程序。Mod-SX被SAL、Science…等5个以上的公共软件档案馆录用在类设计中，注意到面向对象的类设计等同于知识工程领域的本体。因此，特别注意对平衡相图描述中出现的概念进行明确和正式的表示。例如：(1)用两个末端组合物来指定伪二元相图，但这些组合物也可以用具有组合物的物质来表示；(2)相可以用晶体结构来表征，晶体结构用结构类型和组成来表征；以及(3)相本身是不同于物质的实体。该数据库向公众开放。在输入这一数据时，发现所提供的来源信息有几处不一致之处，并以印刷表格的形式进行了很好的校对。这证明了在面向对象的方案中汇编数据的有效性。较少

Distinct features and functionalities of the object-oriented database system may be exploited in the construction of highly versatile phase diagram database services. To test and demonstrate this expectation, the following tasks were carried out : (1) an object-oriented database system program was developed from scratch and tuned for the phase diagram database services ; (2) Classes necessary for phase diagram databases were designed ; (3) Over a hundred phase diagrams were input to a database ; (4) A public phase diagram database service was carried out.During this research term, about 150 collection and improvements were made in the object-oriented database system, MOOD-SX, to achieve further versatility and higher performance. These include the transfer and display of image files and also the development of a user-interface Java applet that allows the database access from the popular web browsers. The MOOD-SX is enlisted in more than 5 public software archives such as SAL, Scientifi … More c Applications for Linux.In the class design, it was noted that the object-oriented class design was equivalent to the ontology in the field of knowledge engineering. Special care, therefore, was taken to make explicit and formal representations of concepts that appeared in the descriptions of equilibrium phase diagrams. For example : (1) a pseudo-binary phase diagram is specified with two terminal compositions but these compositions may be represented as well with substances with the compositions ; (2) a phase may be characterized with a crystal structure, a crystal structure being characterized with a structure type and composition ; and (3) phase as such is an entity distinct from substance.With the class set designed based on discussions as above, about 100 pieces of iron-base binary phase diagrams were input to a database together with about 300 phases and about 80 structure types that appear in the diagrams. The database was offered to public access. Upon this data input, several inconsistencies were found in the source information provided and well proofed in the form of printed tables. This demonstrates the effectiveness of the compilation of data in an object-oriented scheme. Less