基于粗糙集的数据挖掘方法分析

文章从数据挖掘和粗糙集的基本概念出发,研究粗糙集理论在数据挖掘中的典型运用,为大型数据挖掘提供了一种新的方法。基于粗糙集的数据挖掘,首先通过粗糙集理论对数据进行预处理,然后对属性约简,最后进行决策规则提取,寻找最优解。     

基于粗糙集理论的数据挖掘研究初探

数据挖掘是应用一系列技术从大型数据库或数据仓库的数据中提取人们感兴趣的信息或知识，这些知识或信息是隐含的事先未知而潜在有用的，粗糙集理论是一种处理不确定和模糊问题的数学工具，它的一系列优点使其特别适合于数据挖掘研究．介绍了数据挖掘的概念、特点、任务、分类、要求及研究意义，分析了粗糙集理论的特点、所处理的问题、在数据挖掘中的简单应用，以及粗糙集在数据挖掘中的应用展望等。     

S-粗糙集的粗糙度与数据挖掘

介绍了S-粗糙集的概念，在此基础上给出了S-粗糙集粗糙度的概念及其性质，为S-粗糙集在数据挖掘中的应用提供了有用的分析工具。     

粗糙集理论在电力系统数据挖掘中的应用研究

电力系统数据具有数据种类混杂、数据质量差、要求高、实时性等特点。在数据挖掘的诸多方法中,粗糙集理论对于处理复杂系统有明显的优势,研究粗糙集在电力系统数据挖掘中的应用,可以更加充分地利用电力系统数据,揭示数据背后蕴含的原理、规则,为解决电力系统中的许多问题找到更加合理的方法。主要介绍了粗糙集理论和电力系统数据挖掘的特点,论述了粗糙集在电力系统数据挖掘中的应用。     

粗糙集理论及其应用

粗糙集理论是一种新的处理不确定知识的数学工具。目前已在神经网络、机器学习、数据挖掘、模式识别与分类、故障检测等方面得到了广泛应用。首先描述了粗糙集的基本概念，包括不可区分关系、上下近似、知识约简及规则的确定性因子；然后对粗糙集在神经网络、机器学习、数据挖掘等领域中的应用进行了论述。     

数据挖掘常用技术、主要方法及其应用

本文简要论述了数据库技术及数据挖掘的常用技术、主要方法、实际应用，分析了数据挖掘技术的层次、方法，并重点介绍了当前常用的分类、关联规则、粗糙集方法等数据挖掘方法，并指出了当前数据挖掘技术的发展趋势及方向。     

基于粗糙集的数据挖掘的应用研究

粗糙集理论是一种处理不确定和模糊问题的数学工具,它的一系列优点使其特别适合于数据挖掘研究.本文阐述了粗糙集理论及其在数据挖掘中的应用.     

基于粗糙集理论的数据挖掘技术在高校学生成绩分析中的应用

在讨论目前高校教学中存在问题的基础上,简单介绍粗糙集理论及数据挖掘技术。以高校学生成绩为例,提出基于粗糙集理论的数据挖掘技术在高校学生成绩分析中应用的解决方案。     

关于几个数据挖掘技术的讨论

本讨论了数据挖掘技术的研究进展，并对三种方法进行了深入的研究：关联规则、粗糙集、遗传算法。     

基于变精度粗糙集的数据挖掘方法研究

本文分析了数据信息获取的研究背景,并在此基础上提出了数据挖掘方法的研究现状.接下来讨论了在数据挖掘研究中所遇到的技术难题以及发展趋势.最后提出了变精度粗糙集理论在不完备信息系统和完备信息系统中的数据挖掘方法.     

卡思卡特城堡

It is worthy of noting that, whilst Crookston Castle witnessed the earlier and happier portion of Mary's variegated life,     

不同的吃喝玩乐

一、吃和喝吃苹果 eat an apple, 吃药 take medicine,吃糖 have some sweets,吃饭 have one's meals,吃馆子 dine out,吃惊 be surprised/     

漏洞百出的教育

Many college freshmen arrive woefully unprepared to do college work, and as disadvantaged populations continue to grow, the share of the American work force that has made it through college is expected to plummet. Many experts blame that educational failure not just on high schools but also on colleges. School & College, a special report by The Chronicle, looks at efforts to fix the system. What reforms would better prepare students for college? What should schools and colleges be doing differently? How should state and federal officials help?     

Western and Eastern culture differences in commercial field

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.     

只要努力,不要后悔

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.     

浅谈移民问题

Migration occurs behind a variety of reasons and has a great effect on the whole world. People may migrate in order to improve their economic situation, or in order to escape civil strife, persecution, and environmental disasters. The impact of migration is complex, bringing both benefits anddisadvantages. This paper briefly talks about the causes of migration, the allocation of benefits, and the ways in which individual countries and the international community deal with this important subject.     

风的曲线

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.     

Sister Carrie, an Adherent of Desires

Sister Carrie is one of the most controversial characters in American literature.Thought as a "fallen woman" firstly,she was defined as a "new woman" by some critics later. However, by digging into the motivaton behind the whole process of Carrie's "success", the relationship between Carrie and her creator (the author), the social conditions of then American, it can be found that Carrie has never been free-standing on her thought and she has never found her real-sdf even after becoming a famous actress. In a society dominated by mass consumerism Carrie is only an adherent of her own desires. She also is a representative of all those country girls flooded into cities, a symbol and a sacrifice of the urbanization of America in a time countryside was overcome by cities.     

Improvement of one-cycle controller by use of proportional integral differential controller

1.IntroductionOne-cyclecontrolmethod,whichwasproposedaboutonedecadeago[1],hasbecomeanattractivemethodinspecialfieldssuchaspowerfactorcorrection[2-6],switchingamplifiers[7,8],etc.Themainideaofthiscontrollerisbasedonintegrationofdiodevoltageinone-cycleandforcesittobeexactlyequaltothereferencevalue.Themainadvantageofthiscontrollerisitsrealtimeabilitytorejectthevariationofinputvoltage[1].Despitethisgreatability,ithasnogoodperformancesinrejectingofloaddisturbanceandfollowingreferencecommands.Espec…