V. SEMANTIC INFORMATION RETRIEVAL SYSTEM
BASED ON ROUGH ONTOLOGY
To fully show the overall process and mechanism of
rough ontology based semantic information retrieval, a
rough ontology based semantic information retrieval
system ROSRS (Rough Ontology Supported Retrieval
System) is designed and realized. To verify its validation,
precision ratio and recall ratio, it is applied to maritime
accident field.
A. System Design
The functional structure of the ROSRS system as
shown in Fig. 3 is divided into four parts: Knowledge
base management, Information management, Semantic
retrieval, Input and output. Data flow diagram of ROSRS
system is shown in Fig. 4.
Figure