| Currently, in the medical field, the case is extremely valuable source of knowledge, electronic medical informatics case is the realization of goals, and has been a practical application. But now the case of electronic data is in the form of text, its semantic content of computer information can not handle, and will be difficult to achieve automated knowledge acquisition. Moreover, as the electronic case is still not standardized data formats, different information systems can not be achieved sharing and interoperability. The problems above must be resolved from the perspective of formal semantics.By researching on UMLS , Ontology and Object-oriented Database, the article puts forward a medical cases model based on Ontology. The model can describe and memorize medical information in semantic layer. At the same time, it can achieve inter-operation of information in isomerous medical cases. The following are the details:1. Forming idea and basic structure of cases model are advanced. The model is driven by Ontology, including application layer, semantic layer, and data layer. Medical ontological dictionary and object-oriented database on data layer are base and core of this model.2. In the formation of Medical ontological base a mixed strategy is raised, that is, medical ontological dictionary is formed by whole-ontological dictionary and part-ontological base. This dictionary has unified ontology foundation, making the inter-operation of information in isomerous medical cases possible, and increasing the search efficiency and accuracy at a certain extent.3. Object-oriented Database in the model can express semantic information effectively. Ontology is introduced in defining Object-oriented Database to strengthen semantic expression, simplify process, and increase the store efficiency and utilization ratio at a certain extent.4. In the research on noumena mapping, a new arithmetic about concept comparability computing is given and validated by experiment. The arithmetic can ascertain concept comparability among different noumena, establish mapping rules of different medical noumena and support the inter-operation of information in isomerous medical cases. So the study is valuable both in theory and practice. |
