共查询到15条相似文献，搜索用时 203 毫秒
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为简化布尔函数布尔差分及布尔偏导数的计算过程,提出了与-或-非代数系统中计算含无关项布尔函数布尔差分及布尔偏导数的表格算法。该算法通过表格列出1值最小项及无关项的二进制编码,并对表格中二进制编码的相应位取反运算后产生新项来计算布尔差分及布尔偏导数。表格算法与代数方法、图形方法相比,具有快速便捷,适用多变量布尔函数及易于计算机编程等优点。 相似文献
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本文通过对Ei-eompendex和CNKI中文期刊全文数据库中布尔检索异同点的分析研究，探讨了不同信息检索系统中布尔检索的应用区别。 相似文献
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针对传统的Apriori算法需要产生大量的候选项目集和多次扫描数据库的不足,提出了一种新的基于内积运算的频繁项集生成算法。该算法对事务数据库布尔化表示,通过内积运算搜寻矩阵行向量直接生成频繁项集,打破了频繁项集必须从低次到高次的局限,当频繁项集可能是大项集时,大大提高了搜索效率。 相似文献
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基于图形方法的最小项展开系数与Reed-Muller展开系数之间的转换 总被引：1，自引：0，他引：1
通过研究布尔函数二类规范展开形式之间的关系,在综述现有图形转换方法的基础上,对原有的图形方法作了补充,从而进一步揭示了最小项展开系数与Reed-Muller展开系数之间的内在联系,形成了较为完整的图形转换方法. 相似文献
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This paper presents a novel query expansion method, which is combined in the graph-based algorithm for query-focused multi-document summarization, so as to resolve the problem of information limit in the original query. Our approach makes use of both the sentence-to-sentence relations and the sentence-to-word relations to select the query biased informative words from the document set and use them as query expansions to improve the sentence ranking result. Compared to previous query expansion approaches, our approach can capture more relevant information with less noise. We performed experiments on the data of document understanding conference (DUC) 2005 and DUC 2006, and the evaluation results show that the proposed query expansion method can significantly improve the system performance and make our system comparable to the state-of-the-art systems. 相似文献
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Using the algebraic state space representation (ASSR) method, this paper investigates the set stability and synchronization of Boolean networks with probabilistic time delays (PTDs). Firstly, an equivalent stochastic system is established for the Boolean network with PTDs by using the ASSR method. Secondly, based on the probabilistic state transition matrix of equivalent stochastic system, a necessary and sufficient condition is proposed for the set stability of Boolean networks with PTDs. Thirdly, as an application of set stability, the synchronization of coupled Boolean networks with PTDs is studied, and a necessary and sufficient condition is presented. Finally, an illustrative example is given to demonstrate the effectiveness of the obtained new results. 相似文献
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检测逻辑函数对称性的新方法 总被引：6，自引：0，他引：6
本文论述了逻辑函数的Ｒｅｅｄ－Ｍｕｌｌｅｒ展开及ｂ＿ｊ系数图，在此基础上提出了直接检测基于Ｒｅｅｄ－Ｍｕｌｌｅｒ展开的逻辑函数的对称性的新方法。 相似文献
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《Journal of The Franklin Institute》2022,359(1):331-351
This paper investigates the observability of singular Boolean control networks (SBCNs) with state delays. First, via Cheng product, the considered system is converted into its algebraic form. Then, under the uniqueness of the solution, two methods are proposed to transform the system into a general Boolean control network (BCN). Therefore, the considered system’s observability is equivalent to the BCN’s observability. Subsequently, the restricted input-state incidence matrix is introduced and some necessary and sufficient conditions are presented for the observability of BCNs with state delays. Finally, two illustrative examples are presented to show that the main results obtained are effective in analyzing the observability of SBCNs with state delays. 相似文献