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动态约简
相关语句
  dynamic reduction
     At last, the dynamic reduction algorithm is improved and the improved algorithm is given.
     最后,基于不完备信息系统本身的特点,对动态约简算法进行了改进,并提出了一种改进算法。
短句来源
     Dynamic reduction problem is discussed and algorithm adding and reducing rules in the decision-making table dynamically are put foreword so as to reduce the computing complexity.
     一方面分析了动态自主知识获取问题中的决策表动态约简问题,确定了在获得基本最小规则集后动态增加或减少规则的算法。
短句来源
     The research of this thesis is mainly about the dynamic reduction based on rough set theory as well as how to establish and develop the decision rules after completing the reduction.
     本论文的研究工作,主要围绕着基于粗糙集理论的动态约简以求得决策规则。
短句来源
  dynamic reduce
     Rough set knowledge acquisition of“divide equally and examine each other”and“dynamic reduce”based on variable precision model
     基于变精度模型的平分互测动态约简粗糙集知识发现方法研究
短句来源
     In order to solve the problem of the fluctuation of reduc- tion with the data set random division, this thesis bring forward the method of dynamic reduce to confirm the best reduction, and succeed in obtaining the optimum rule by applying the best reduction to data set.
     为克服数据集随机分割带来的约简值浮动变化的问题,本文提出了动态约简的方法筛选出最优约简,将此最优约简应用于数据全集生成最优规则。
短句来源
  “动态约简”译为未确定词的双语例句
     The Research of Dynamic Reduct Based on Rough Set Theory
     基于粗糙集理论的动态约简研究
短句来源
     Study for Dynamic Reduct Based on Rough Set
     粗集动态约简研究
短句来源
     Sampling Analysis in Dynamic Reduct
     动态约简的抽样分析
短句来源
     Dynamic Reduct Sampling Analysis
     动态约简抽样分析
     The research of this thesis is mainly about the dynamic reduct based on rough set theory as well as how to establish and develop the decision rules after completing the reduct.
     本论文的研究工作,主要围绕着基于粗糙集理论的动态约简和完成约简后决策规则的如何制定展开。
短句来源
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  相似匹配句对
     Dynamic State
     动态
短句来源
     Dynamic Reduct Sampling Analysis
     动态约简抽样分析
     DYNAMIC
     动态
短句来源
     Sampling Analysis in Dynamic Reduct
     动态约简的抽样分析
短句来源
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  dynamic reduction
The dynamic reduction method is introduced to eliminate the local vibration modes in order to obtain the whole ship's mode shapes.
      
The modal analysis indicates that the dynamic reduction method fits for mode shapes identifying.
      
The distributed parameter design problem is approached using assumed shape functions and finite element analysis with dynamic reduction.
      
The characterization of both the invariant sections and the reduced equations are summarized schematically by the kinematic and dynamic reduction diagrams and are illustrated by a number of examples from fluid mechanics,
      
A technique of dynamic reduction for displaced fractures of the thalamus of the calcaneum
      
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In this paper we propose a new dynamic reduct algorithm based on rough sets theory. When the number of the object in the information table increase, instead of treating the changed information table as a new one and finding the reduct again like rough set reduct algorithm does, the dynamic reduct algorithm just update the old reduct set based on the increased objects, so the computation time is greatly saved. Also the entropy criterion is introduced to the dynamic reduct algorithm, so the statistical causality...

In this paper we propose a new dynamic reduct algorithm based on rough sets theory. When the number of the object in the information table increase, instead of treating the changed information table as a new one and finding the reduct again like rough set reduct algorithm does, the dynamic reduct algorithm just update the old reduct set based on the increased objects, so the computation time is greatly saved. Also the entropy criterion is introduced to the dynamic reduct algorithm, so the statistical causality between the attributes could be find and the reduct′s sensitivity to the noise unavoidably when the \$γ\$ criterion is applied could be removed. An illustrated example shows that by the dynamic reduct algorithm, computation time is greatly saved compared with the rough set theory based reduct algorithm, at the same time the same reduct is find with less objects, furthermore the results are sorted according to their causal strength.

针对动态建立数据库的需要和粗集约简存在的问题 ,在粗集理论的基础上提出了一种动态约简算法 .在数据库变化时 ,该算法不象静态粗集约简方法需重新寻找属性约简 ,而是利用新增的对象对原有的约简关系进行修正 ,大大节省了计算量 ,提高了搜索效率 ;同时在算法中还引入了信息熵准则以克服粗集约简准则对数据噪声的敏感性和不能表达属性间概率因果关系的缺点 .通过一个病因诊断问题的实例表明 ,该算法利用较小的信息表就找到了与静态粗集约简一致的属性约简集 ,并按照因果关系的大小 (不确定性大小 )对结果集合作了排序 ,同时计算量分析表明该算法比静态粗集约简极大地节省了计算量 ,提高了搜索效率 .

Feature subset selection is an important topic in the fields of machine learning and rough analysis. It has the direct effect on the quality of knowledge elicited and corresponding decision. Cmade In this paper , some main methods for feature selection, including dynamic reduct ,neural networks, hyperplane plane, generalized template and the decomposition of decision tables , ITIL proposed herein are reviowed and the related problems are pointed out for further research.

特征提取是机器学习和决策表分析的重要步骤 ,直接关系到学习和决策质量 .文中对目前特征提取的几种主要方法 ,即动态约简、神经网络、超平面、模板和作者提出的决策表分解、ITIL算法进行了评述 ,指出这些方法存在的不足 ,为特征提取的进一步研究指明了方向 .

The paper presents a fault-rule acquisition system by applying the rough set theory and the dynamic reduction technique. The key technologies adopted in the system include the way of representing the fault-sample as a relation decision table, the random sampling of sub-tables of the decision table, the design of the dynamic reduction algorithm of the condition attributes, the filtration of the reduction set, the definition of the fault-rule structure, and the acquisition and the evaluation of the final fault-rules....

The paper presents a fault-rule acquisition system by applying the rough set theory and the dynamic reduction technique. The key technologies adopted in the system include the way of representing the fault-sample as a relation decision table, the random sampling of sub-tables of the decision table, the design of the dynamic reduction algorithm of the condition attributes, the filtration of the reduction set, the definition of the fault-rule structure, and the acquisition and the evaluation of the final fault-rules. A relevant software is developed with VC. As an example,the procedure of the automatic acquisition of the fault-rules of an unusual automobile engine noise-fault is presented and analyzed,the result of which proves to be effective.

为增强故障诊断专家系统处理不完备信息和自动获取规则知识的能力,应用粗集理论及动态约简思想,深入研究并初步建立了故障规则自动获取系统。其中关键技术包括:故障样本信息的关系型决策表表示;决策表子表的随机采样;条件属性的动态约简算法设计;约简集合的过滤;故障规则的表达结构定义;故障规则的提取和规则的评价等。开发了相应的基于VC++平台的计算机软件,并以汽车发动机异响类故障为样本,对系统的故障规则获取过程进行了案例分析,从相关的实验结果和数据来看,较好地实现了系统的预定目标和功能。

 
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