基于本体的制造网格服务自动链接

An Ontology Based Approach of Automated Service Chaining for Manufacturing Grid

研究了一种基于本体、面向服务功能自动生成制造网格工作流构架的方法。制造网格本体采用制造领域本体与网格服务本体集成的方法来构建,前者由STEP集成资源、TOVE、PSL以正交方式分别实现产品、企业和制造过程子本体,后者通过扩展Web服务本体OWL-S实现。服务功能采用基于制造对象特征的输入、输出和基于制造任务的前提条件、效果组成的四元组建模,使用制造网格本体描述。在此基础上,提出了一种服务正向递进自动链接算法,它能够依据用户指定的输入和前提条件选择并链接服务,最终达到用户指定的输出和效果。通过一个原型系统和实例验证了方法的有效性,实验结果表明算法具有良好的性能。

This paper focused on an ontology based and function oriented approach of automated service chaining, which aimed at selecting, fabricating MG services into concrete workflow skeletons. MG ontology was constructed by means of integrating two sub-ontologies, which were manufacturing domain--specific ontology and grid service ontology. Three well--formed ontologies -- STEP integrated resource for product data, TOVE for enterprise, and PSL outer core for manufacturing process were employed to implement the former sub--ontology. The latter sub--ontology was imple- mented by an OWL--S extension towards grid. MG service function was modeled by a 4-ary tuple of input, output, precondition and effect （lOPEs）, which was described by the MG ontology. Then, a forward expansive chaining algorithm was proposed, which can automatically produce service chains satisfying the IOPEs requirements of a user goal. A prototype system is implemented, and experimental results on the machining of a part have verified the approach and show that the algorithm is efficient.