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话语情态与时态
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作者 陈其功 《聊城师范学院学报(哲学社会科学版)》 2001年第5期97-98,36,共3页
话语情态为说话者对所述命题的态度与信念。时态表明了动词形式与时间概念的一致 ,但也含有在语义上清楚地表明为话语情态的成分 ,并与之发生最经常最密切的关系。值得注意的是 ,过去时态与情态具有相当密切的关系 ,而将来也不纯粹是一... 话语情态为说话者对所述命题的态度与信念。时态表明了动词形式与时间概念的一致 ,但也含有在语义上清楚地表明为话语情态的成分 ,并与之发生最经常最密切的关系。值得注意的是 ,过去时态与情态具有相当密切的关系 ,而将来也不纯粹是一个时间概念 。 展开更多
关键词 话语情态 过去时态 情态判断 转移抽象 将来时态 预测
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The Convergence of the Abstract Evolutionary Algorithm Based on a Special Selection Mechanism
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作者 BIYong-qing XUEMing-zhi 《Chinese Quarterly Journal of Mathematics》 CSCD 2003年第2期213-220,共8页
There has been a growing interest in mathematical models to character the evolutionary algorithms. The best-known one of such models is the axiomatic model colled the abstract evolutionary algorithm. In this paper, we... There has been a growing interest in mathematical models to character the evolutionary algorithms. The best-known one of such models is the axiomatic model colled the abstract evolutionary algorithm. In this paper, we first introduce the definitions of the abhstract selection and evolution operators, and that of the abstract evolutionary algorithm, which describes the evolution as an abstract stochastic process composed of these two fundamental abstract operators. In particular, a kind of abstract evolutionary algorithms based on a special selection mechansim is discussed. According to the sorting for the state space, the properties of the single step transition matrix for the algorithm are anaylzed. In the end, we prove that the limit probability distribution of the Markov chains exists. The present work provides a big step toward the establishment of a unified theory of evolutionary computation. 展开更多
关键词 abstract evolutionary algorithm a transition matrix CONVERGENCE
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