Comparison of fast discrete wavelet transform algorithms     

孟书苹 《重庆大学学报(英文版)》2005,4(2):84-89

1 Introduction 1 With the development of the application of wavelet transform (WT), the speed of wavelet transform as a hot issue has been put forward. Fast algorithms of wavelet transform have been studied by many scholars. The Mallat pyramid algorithm put forward by Mallat, as the earliest one in this category, greatly reduces the arithmetic complexity of WT, and plays an important role in the theoretical research of the theory of wavelets. Since its coming into being, various fast algori…  相似文献   

DES与AES的比较研究     

聂定远  李小俊 《教育技术导刊》2007,(5)

讨论了目前主要的一些数据加密算法、DES算法及高级加密标准(AES)的Rijndael算法。比较了DES、AES对称密码算法,得出AES具有比DES更好的安全性、效率、灵活性的结论。  相似文献   

基于遗传算法的智能组卷研究     

吴晓琴 《合肥联合大学学报》2007,17(2):47-50

分析了智能组卷约束条件，建立了智能组卷系统的数学模型，并给出了改进的遗传算法求解智能组卷问题的新方法．实验结果表明所提出的新组卷算法相对于其他算法更能有效地解决自动组卷问题，组卷成功率高，组卷速度快，具有较好的性能和实用性。  相似文献   

有理系数多项式可约性判别的计算机实现     

王积社  林敏丽 《嘉应学院学报》2013,31(5):5-10

根据多项式可约性的Kronecker判别法,设计出判别有理系数多项式可约性的算法,并编写出相应的C语言程序,同时给出了若干计算结果.  相似文献   

Teaching Scientific Analogies: a proposed model   总被引：1，自引：1，他引：0  

Hassan Hussein Zeitoun 《Research in Science & Technological Education》2013,31(2):107-125

The purpose of this paper is to propose a model for teaching scientific analogies. This model is called: ‘The General Model of Analogy Teaching’ (GMAT). A theoretical framework is developed first for this model. The following points are covered in this framework: (1) definition of the analogy, (2) analogical learning, (3) variables related to the analogical learning, (4) evaluating the outcomes of analogical learning, and (5) limitations of using analogies in teaching. The General Model of Analogy Teaching proceeds in the following nine stages: (1) measure some of the students’ characteristics related to analogical learning in general, (2) assess the prior knowledge of the students about the ‘topic’ to be taught, (3) analyse the learning material of the ‘topic’ to be taught, (4) judge the appropriateness of the analogy to be used, (5) determine the characteristics of the analogy to be used, (6) select the strategy of teaching and the medium of presenting the analogy, (7) present the analogy to the students, (8) evaluate the outcomes of using the analogy in teaching, and (9) revise the stages of the model.  相似文献   

遗传算法在排课问题求解中的应用   总被引：1，自引：0，他引：1  

安勐 《铜仁学院学报》2009,11(2):135-136,139

排课问题是多因素优化决策问题,本文根据编排课表的特点;建立铜仁学院自动排课系统的数学模型,并设计了新的适应值函数,用遗传算法进行求解。若对本系统的适应度函数作适当修改,可适用于各类学校的排课问题。  相似文献   

差分进化算法研究进展     

王杰文 《湖南第一师范学报》2009,9(6):144-147

在简要介绍基本差分进化算法的基础上,可总结出差分算法家族系列。差分算法已有了最新变种;差分算法与粒子群算法结合可形成新的算法。  相似文献   

基于遗传算法的数据预处理组合方法     

袁溪  王晅 《西安文理学院学报》2009,12(4):73-75

进行数据挖掘之前的原始数据经常是不完整或存在异常,针对这种情况,在众多数据预处理算法的基础之上,文中提出了一种基于遗传算法的数据预处理组合方法,能有效的利用各种方法的优点,提高了估计的精确度.通过实验证明,该方法优于其他各种单一方法.  相似文献   

Enhancing information source selection using a genetic algorithm and social tagging     

《International Journal of Information Management》2017,37(6):741-749

  相似文献   

A new variant of the Pathfinder algorithm to generate large visual science maps in cubic time     

A. Quirin  O. Cordón  J. Santamaría  B. Vargas-Quesada  F. Moya-Anegón 《Information processing & management》2008

In the last few years, there is an increasing interest to generate visual representations of very large scientific domains. A methodology based on the combined use of ISI–JCR category cocitation and social networks analysis through the use of the Pathfinder algorithm has demonstrated its ability to achieve high quality, schematic visualizations for these kinds of domains. Now, the next step would be to generate these scientograms in an on-line fashion. To do so, there is a need to significantly decrease the run time of the latter pruning technique when working with category cocitation matrices of a large dimension like the ones handled in these large domains (Pathfinder has a time complexity order of O(n⁴), with n being the number of categories in the cocitation matrix, i.e., the number of nodes in the network).  相似文献