Fuzzy grammar theory based on lattices

Fuzzy grammar theory based on lattices
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基于格的模糊语法理论

DOI:
10.1007/s00500-012-0845-1
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发表时间:
2012-03
期刊:
影响因子:
4.1
通讯作者:
Li, Qingguo
Li, Qingguo
中科院分区:
计算机科学3区
文献类型:
--
作者:
Jin, Jianhua;Li, Qingguo

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本文在广度优先和深度优先的基础上,建立了基于格的模糊语法基本框架,为模糊自动机的分析提供了必要的工具。研究了格上有隶属值的有限自动机(l-VFAs)、格值正则语法(l-RGs)和格值确定性正则语法(l-DRGs)之间的关系。结果表明,基于每种语义方式,l- vfa和l- rgs在接受或生成同一类模糊语言的意义上是等价的。进一步证明了基于深度优先的l- vfa、l值确定性有限自动机、l-RGs和l- drgs是等价的。对于anyl-RG,当且仅当真值域是分布格时,基于宽度优先方式的语言与基于深度优先方式的语言重合。
In this paper, on the basis of breadth-first and depth-first ways, we establish a fundamental framework of fuzzy grammars based on lattices, which provides a necessary tool for the analysis of fuzzy automata. The relationship among finite automata with membership values in lattices (l-VFAs), lattice-valued regular grammars (l-RGs) and lattice-valued deterministic regular grammars (l-DRGs) is investigated. It is demonstrated that, based on each semantic way,l-VFAs andl-RGs are equivalent in the sense that they accept or generate the same classes of fuzzy languages. Furthermore, it is proved thatl-VFAs,l-valued deterministic finite automata,l-RGs andl-DRGs are equivalent based on depth-first way. For anyl-RG, the language based on breadth-first way coincides with the language based on depth-first way if and only if the truth-valued domainlis a distributive lattice.
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