In order to implement semantic mapping of database metasearch engines, a system is proposed, which uses ontology as the organization form of information and records the new words not appearing in the ontology. When th...In order to implement semantic mapping of database metasearch engines, a system is proposed, which uses ontology as the organization form of information and records the new words not appearing in the ontology. When the new word＇ s frequency of use exceeds the threshold, it is added into the ontology. Ontology expansion is implemented in this way. The search process supports ＂and＂ and ＂or＂ Boolean operations accordingly. In order to improve the mapping speed of the system, a memory module is added which can memorize the recent query information of users and automatically learn the user＇ s query interest during the mapping which can dynamically decide the search order of instances tables. Experiments prove that these measures can obviously reduce the average mapping time.展开更多
This paper tries to introduce and apply the theory of lexical phrases to effecting efficient training in listening comprehension course. The author argues for the feasibility of this application with the psychological...This paper tries to introduce and apply the theory of lexical phrases to effecting efficient training in listening comprehension course. The author argues for the feasibility of this application with the psychological theory of memory mechanism, the linguistic theory of lexical phrases and lexical patterns in discourse, supported by field practice. The aim is to direct pedagogical attention to lexical phrases as prefabricated chunks, their function, both discoursal and lexical, in text production and processing.展开更多
文摘In order to implement semantic mapping of database metasearch engines, a system is proposed, which uses ontology as the organization form of information and records the new words not appearing in the ontology. When the new word＇ s frequency of use exceeds the threshold, it is added into the ontology. Ontology expansion is implemented in this way. The search process supports ＂and＂ and ＂or＂ Boolean operations accordingly. In order to improve the mapping speed of the system, a memory module is added which can memorize the recent query information of users and automatically learn the user＇ s query interest during the mapping which can dynamically decide the search order of instances tables. Experiments prove that these measures can obviously reduce the average mapping time.
文摘This paper tries to introduce and apply the theory of lexical phrases to effecting efficient training in listening comprehension course. The author argues for the feasibility of this application with the psychological theory of memory mechanism, the linguistic theory of lexical phrases and lexical patterns in discourse, supported by field practice. The aim is to direct pedagogical attention to lexical phrases as prefabricated chunks, their function, both discoursal and lexical, in text production and processing.
