共查询到20条相似文献，搜索用时 562 毫秒
1.
金可仲 《温州大学学报(社会科学版)》2008,(1):56-60
日志是计算机取证、入侵检测分析的重要数据来源,运用关联规则挖掘算法对日志进行分析是获取日志中所蕴含有用信息的重要方法,针对基于置信度-支持度框架的常用关联规则挖掘算法在日志分析中存在的不足,引入日志关键属性的概念,提出了基于关键属性约束的关联规则挖掘算法。实验结果表明,该算法能有效阻止无趣规则的产生,提高挖掘结果的有效性。 相似文献
2.
关联规则是数据挖掘中一个非常重要的任务,有许多针对于关联规则的挖掘算法,然而需要提高算法的有效性来处理现实世界中的数据集。基于聚类的关联规则挖掘算法法通过扫描数据库创建聚类表,将收集的事务记录放入聚类表中,通过局部聚类表的约束来产生频繁项集,不仅可以剪枝候选项集,降低数据扫描的时间,而且确保挖掘结果集的正确性。实验结果表明,基于聚类的关联规则挖掘算法比Apfiori算法有更高的执行效率。 相似文献
3.
关联规则挖掘算法是数据挖掘领域的主要研究方向之一。对几种经典的关联规则挖掘算法进行了分析、探讨和比较,给出了一种基于支持矩阵的、不需要产生候选项目集的算法设计思想。算法为事务数据库中的每个项目设置二进制向量,利用逻辑与运算构造支持矩阵来挖掘频繁项目集,极大地节省了存储空间,提高了算法运行效率。 相似文献
4.
对关联规则的挖掘算法进行了讨论，提出了一种基于集合枚举树的关联规则挖掘算法．由于该算法产生的侯选项目集为最小侯选项目集，不需要修剪，因而提高了算法的效率。 相似文献
5.
针对煤炭企业采用的基于关联规则的数据挖掘技术存在的不足,文章提出了一种基于时间聚类的加权关联规则挖掘算法,分析了关联规则的基本概念,简要介绍了传统Apriori算法原理,详细介绍了基于时间聚类的加权关联规则挖掘算法原理及实现．实际应用范例表明,与Apriori算法相比,基于时间聚类的加权关联规则挖掘算法具有较高的准确性． 相似文献
6.
将项目权值引入传统关联规则挖掘中是在项目属性上的扩展。本文分析项目权值对加权关联规则挖掘的影响,并对加权关联规则现有的算法进行总结,同时比较各算法的优缺点。最后对加权关联规则的未来研究发展方向进行探讨。 相似文献
7.
邹永平 《河北能源职业技术学院学报》2013,(1):64-66,70
改进后的Fp-Growth挖掘算法适用于对大型数据库的数据关联规则的挖掘,基于一种新的数据库分隔方法来分隔数据库,并对分隔得到的各数据库子集用算法进行约束频繁项集挖掘。改进的数据库划分策略克服了占用内存大的缺陷,提高了挖掘速度,实时性更强。 相似文献
8.
邹永平 《天津工程师范学院学报》2012,22(4)
对数据关联规则挖掘中最为消耗系统资源的步骤——搜寻频繁项集作了深入的描述,在对已有数据关联规则挖掘算法的分析基础上,提出了基于Fp—Growth算法的数据关联规则挖掘改进的Fp—Growth算法,开发了无锡交通高等职业技术学校的教务管理系统,并通过实验验证了改进的挖掘算法的有效性和优越性。 相似文献
9.
超市购物篮分析是关联规则挖掘的典型应用领域,分析了关联规则在超市销售系统中的应用,然后提出了一种基于二维数组的关联规则挖掘实现算法,并根据算法开发实现了挖掘系统。通过模拟的超市销售数据进行试验表明,算法及所实现的系统是可行的、高效的。 相似文献
10.
焦振 《重庆职业技术学院学报》2009,18(2):115-117
本文主要研究了数据挖掘中关联规则挖掘算法的改进方法,通过分析经典的Apriori算法,找出算法的不足．提出了一种基于矩阵行向量运算的频繁集挖掘的关联规则挖掘算法思想,并对Apriori算法进行了改进。 相似文献
11.
罗艳萍 《读与写:教育教学刊》2008,5(6)
The communication of people partially is the communication of cultures. Culture has a direct effect on international commercial activities in all aspects. Different conceptions about time, space, equality, law and the like, lead people to deal with things in different ways. So to know cultures of the counterpart is to facil-itate our enterprises so as to have a smooth and successful communication in commercial activity. 相似文献
12.
Richard Denner 《海外英语》2007,(4):14-15
Rosco and I wait for the fishermen to return.I sit at a wooden bench near the store at Mt.Baker Resort and watch the clouds change shape. Rosco has my belt around his neck and an eight foot tow chain hooked to a tree. Dogs must be on a leash. Ducks and rabbits are loose. 相似文献
13.
Given a graph G,a subgraph C is called a clique of G if C is a complete subgraph of G maximal under inclusion and |C|≥2. A clique-transversal set S of G is a set of vertices of G such that S meets all cliques of G. The clique-transversal number, denoted as TC (G), is the minimum cardinality of a clique-transversal set in G. The clique-graph of G, denoted as K (G), is the graph obtained by taking the cliques of G as vertices, and two vertices are adjacent if and only if the corresponding cliques in G have nonempty intersection. Let F be a class of graphs G such that F={G|K(G) is a tree}. In this paper the graphs in F having independent clique-transversal sets are shown and thus TC (G)/|G|≤1/2 for all G ∈ F. 相似文献
14.
邱崇丙 《唐山师范学院学报》2014,(1):21-23
汉字的六书,《说文》对“转注”一类,语焉不详。后世学者提及转注,也仅限于许慎所举出的例字。《汉字例说》一文,作者从转注的角度综合考虑,对部分现代常用字作了分析,跟传统的解释有所不同。希望能抛砖引玉,互相切磋,以推进学术研究。 相似文献
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16.
陈美曦 《山东教育学院学报》2008,23(2):103-107
Different nations have different social cultures, and the social culture of every nation is developing with the development of the nation, language is greatly influenced by social culture, which enables language to possess national and historical characteristics. Word is the smallest, independent, meaningful linguistic unit of language. It can well reflect the national and historical characteristics. From synchronic aspect, the social and cultural influence on word meaning is mainly embodied in conceptual and associative meanings of word. The incorrespondence of word meaning is a phenomenon that exists in both conceptual and associative meanings of word among different languages. From diachronic aspect, the development of social culture causes some changes of word meaning to some extent. Therefore, social culture plays a key role in vocabulary learning and mastery of a language. 相似文献
17.
Rachel Zupek 《海外英语》2007,(11):40-41
我们绝大部分人都同意一件事情——我们喜欢金钱。但是你对金钱的喜欢之情足够到让你创立一份事业么?.财富通常被人忽视,主要在于人们不能真正了 相似文献
18.
《海外英语》2007,(4):36
There are numbers of crossroads on our long and unpredictable life journey where we totally have no idea about which direction to choose. No matter what our decision is, we should not turn back, but face the music and go ahead instead. I am this kind of girl who always does try without regretting, one example is how I dealt with my love. 相似文献
19.
YANGShiguo 《重庆大学学报(英文版)》2004,3(1):86-88
The problem on the geometrc inequalities involving an n-dimensional simplex and its inscribed simplex is studied. Aninequality is established, which reveals that the difference between the squared circumradius of the n-dimensional simplex andthe squared distance between its circumcenter and barycenter times the squared circumradius of its inscribed simplex is not lessthan the 2(n-1)th power of n times its squared inradius, and is equal to when the simplex is regular and its inscribed siplex is atangent point one. Deduction from this inequality reaches a generalization of n-dimensional Euler inequality indicating that thecircumradius of the simplex is not less than the n-fold inradius. Another inequality is derived to present the relationship betweenthe circumradius of the n-dimensional simplex and the circumradius and inradius of its pedal simplex. 相似文献