A Study of Disjunctive Information in Fuzzy Relational Databases

王明華(Ming-Hua Wang) ； 葛煥昭(Huan-Chao Keh) ； 謝楠楨(Nan-Chen Hsieh) ； 王琮盛(Tsong-Sheng Wang)

《Journal of Information Science and Engineering》 22卷1期 (2006/01) Pp. 199-213

https://doi.org/10.6688/JISE.2006.22.1.12

並列摘要

This paper proposes a logical reconstruction of the classical fuzzy relational database model to accommodate fuzzy disjunctive information. In query processing, we use two supplementary measurements, matching information and extra information, to model the concepts of imprecision and uncertainty, respectively. We also use these two supplementary measurements to determine the quality of answers to the query. The answers to the query thus contain sure answers and maybe answers. In addition, we discuss the redundancy problem by presenting a complete set of fuzzy relational algebra with fuzzy disjunctive information. The proposed extended fuzzy relational database model preserves the properties-uniquely-determined and well-defined properties of relational algebra to ensure that the manipulative power of the proposed model is the same as that of the classical fuzzy relational database model.

並列關鍵字

fuzzy relational database ； fuzzy disjunctive information ； imprecision ； uncertainty ； quality of answer