共查询到20条相似文献，搜索用时 46 毫秒
1.
王志丹 《洛阳师范学院学报》2014,(8):64-66
面对海量数据的信息系统,通过引入MapReduce模型,重构Map和Reduce函数,本文提出了基于云计算的属性重要度约简算法,较好地实现了海量数据集中的属性约简,为属性约简研究提供了新思路.最后,实例分析表明,该约简算法是有效可行的. 相似文献
2.
提出基于云计算平台（以Hadoop为例）应用布尔矩阵Apriori算法进行大数据关联规则挖掘的MR_B_Apriori算法。将Hadoop平台与布尔矩阵Apriori算法相结合,利用MapReduce框架分块处理布尔矩阵,计算出分块数据的频度,合并融合得到大数据集的频繁项集。分析表明MR_B_Apriori算法能够适用于大数据的频繁项集挖掘。 相似文献
3.
基于用户的协同过滤推荐算法是应用范围广且应用效果较好的推荐算法之一。传统单机模式下运行的基于用户的协同过滤推荐算法在面对海量数据时存在严重的性能瓶颈问题,很难满足实际计算需求,而基于MapReduce的并行计算框架为解决该问题提供了新思路。MapReduce是Hadoop开源框架的核心计算编程模型, MapReduce的设计目标是方便编程人员在不熟悉分布式并行编程的情况下,可将自己的程序运行在分布式系统上。根据基于用户的协同过滤推荐算法特点,提出MapReduce并行化实现方法。实验结果表明,在MapReduce并行计算框架下实现的基于用户的协同过滤推荐算法在算法性能及稳定性方面都取得了理想效果。 相似文献
4.
5.
针对传统装箱算法在处理海量数据时所存在的的运行效率与空间利用率低的问题,在深入研究已有装箱算法的基础上,在分布式系统中定义一种可变大小的箱子,结合动态和静态算法的优势,提出基于MapReduce的动态装箱算法。实验结果表明,针对海量动态数据,运用基于MapReduce的动态装箱算法,结果接近最优解,同时具有很高的处理效率。 相似文献
6.
7.
近年来,随着Web2.0的兴起,互联网信息更加丰富,数据规模日益增加,传统数据挖掘技术难以满足需要.云计算为解决这一问题提出了一种新方法.本文首先对开源的云计算技术Hadoop进行介绍,然后,对分布式进行了设计.本文将聚类过程分为三个步骤,分别对TF-IDF关键词提取、LDA 模型训练和K －means 聚类过程进行MapReduce 的实现,并使用公共微博数据集进行了聚类实验,并与传统聚类方法进行对比,结果表明,本文所使用LDA 建模的分布式算法对中文微博数据聚类效果较好. 相似文献
8.
针对现有序列聚类算法在对大规模数据进行聚类时,内存空间和计算时间开销较大的问题,提出了基于MapReduce的人工蜂群聚类算法。该算法通过引入MapReduce并行编程范式,快速计算聚类中心适应度,可实现对大规模数据的高效聚类。基于仿真数据对算法的聚类效果和聚类效率进行了验证。实验结果表明,与现有PK-Means算法和并行K-PSO算法相比,该算法具有更好的聚类效果和更高的聚类效率。 相似文献
9.
李素若 《荆门职业技术学院学报》2015,(2)
由于照相机等设备的便携化和互联网的触手可得,每天有海量互联网图像产生。针对这种情况,提出了基于MapReduce的互联网图像相似性度量算法。算法首先提取了语义级的图像特征,包括图像的主要颜色、形状和构图等,然后基于上述图像特征归一化,设计合理的Map方法和Reduce方法,并行计算出输入图像与图像库中的图像的相似性评分,排序得到最相似图像的几幅图形,最后构建了基于MapReduce的互联网相似图像搜索系统。实验结果表明,基于MapReduce的图像相似性度量算法,同样适用于互联网海量图像,并比传统的图像相似性度量算法具有更好的灵活性和可扩展性。 相似文献
10.
为提高BP神经网络算法的运行效率,利用遗传算法和并行编程思想,提出了Hadoop平台下基于MapReduce的遗传算法优化BP神经网络的并行化设计及实现方法。利用遗传算法优化BP神经网络的初始权值和阈值,提高算法分类准确率;采用MapReduce并行编程模型实现算法的并行化处理,解决BP神经网络在处理大规模样本数据集时存在的硬件开销和通信开销大的问题。选用Caltech256图像数据集,与传统的串行遗传算法优化BP神经网络算法实验对比,验证了并行化GA BP神经网络算法的优越性。 相似文献
11.
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
12.
13.
14.
《海外英语》2007,(5):10-11
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? 相似文献
15.
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
16.
《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
17.
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
18.
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. 相似文献
19.
20.
GUO Bao-feng Xiao Da-wei 《重庆大学学报(英文版)》2005,4(3):129-133
Using virtual reality for interactive design gives a designer an intuitive vision of a design and allows the designer to achieve a viable, optimal solution in a timely manner. The article discusses the process of making the Virtual Reality System of the Humble Administrator＇s Garden. Translating building data to the Virtual Reality Modeling Language （VRML） is by far unsatisfactory. This creates a challenge for computer designers to do optimization to meet requirements. Five different approaches to optimize models have been presented in this paper. The other methods are to optimize VRML and to reduce the file size. This is done by keeping polygon counts to a minimum and by applying such techniques as object culling and level-ofdetail switching. 相似文献