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題名 | Representation and Processing of Uncertain Information in Database and knowledge-Base Systems=不確定資訊在資料庫及知識庫中的表示與處理 |
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作者姓名(中文) | 周農; 王裕華; | 書刊名 | 南臺工商專校學報 |
卷期 | 20 1994.11[民83.11] |
頁次 | 頁119-124 |
分類號 | 312.49 |
關鍵詞 | 三值邏輯; 模糊邏輯; 不確定資訊; 資料庫; 非連續性加值副組合; Three-valued login; Fuzzy logic; Uncertain information; Database; Weighted disjunctive subtuple; |
語文 | 英文(English) |
中文摘要 | 本文討論三值邏輯與模糊邏輯在關聯式資料庫中表示不確定資訊的問題,然後介 紹一個新的不確定資訊的表示方法, 我們稱之為非連續性加值副組合( Weighted Disjunctive Subtuple )。 它是由數個可能相關的非連續性組合及其發生可能性定義而成 。 根據這樣的表示法及其衍生的或然率邏輯,一個邏輯運算式會對映到〔 0,1 〕之間,而 不是三值邏輯的〔 T,F,U 〕。 一個關係( relation )也延伸成為 Dom ( R )的一個模 糊副集合,關聯式代數運算( relational algebra operations )也由此而重新定義。 |
英文摘要 | In this paper, we first discuss the problems in three-valued logic and fuzzy logic in representing the uncertain information in relational database systems; then, a new representation of uncertain data. called weighted disjunctive subtuple, is proposed. It is defined as a disjunction of several possible tuples along with their possibility distribution. Based on this representation and probabilistic logic, the evaluation of a logical expression is defined as a mapping to [0,1], instead of [T(true), F(false), U(uncertain)]. The concept about a relation is also extended as a fuzzy subset of Dom(R). The set of relational algebra operations are also extended accordingly. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。