基于NS的Ad hoc路由协议研究

在分析Ad Hoc无线网络基本特性的基础上,综合评述Ad Hoc网络路由协议主要的研究现状,讨论Ad Hoc无线网络路由协议的发展趋势和挑战。对几种典型的Ad Hoc网络路由协议的特点进行分类分析和比较,着重分析AODV,DSDV,DSR等3种协议的特点及路由机制,并使用NS2仿真软件对其仿真,再从仿真结果中分析数据,绘出图表进行比较。     

一种求解非线性约束优化的单变量边缘分布算法

借鉴罚函数法思想,将建立在Gauss网络的单变量边缘分布算法应用于非线性约束优化问题,提出的新算法突破了传统基于约束保持法或可行规则法的约束处理.且单变量边缘分布是基于搜索空间的宏观层面的进化方法,具备更强的全局搜索能力和更高的收敛率,从而为约束问题的求解提供了一种新的途径.     

How Do Children Come to Use a Taught Mental Calculation Strategy?

This study provides an in-depth analysis of children's use of a taught mental calculation strategy. Three children (aged eight to nine years) who demonstrated contrasting spontaneous calculation approaches, were interviewed following the direct instruction of a calculation strategy. Their responses are explored in relation to constructivist and participation perspectives of learning. In response to a unified view of these theories, hypotheses are generated that ask fundamental questions related to the did actics of mental calculation strategies. This revised version was published online in July 2006 with corrections to the Cover Date.     

Comparison of fast discrete wavelet transform algorithms

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…     

DES与AES的比较研究

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。     

Teaching Scientific Analogies: a proposed model

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.     

遗传算法在排课问题求解中的应用

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。     

基于主成分追踪的视频文本定位

视频中的大部分文本,特别是标题字幕会与背景有较强的对比,另外,部分文本会做线性运行或不规则运动,针对上述两种情况,提出了基于主成分追踪的视频文本定位方法,将主成分追踪这种矩阵分解算法成功应用于视频文本的定位系统中,主要包含两个步骤,首先进行视频分解,通过主成分追踪算法将视频帧分解成低秩矩阵和稀疏矩阵两部分,稀疏矩阵中包含了大部分文本信息,接下来在稀疏矩阵中进行文本定位.该方法减少了后续的文本提取和识别的难度,算法简单可行,实用性强,具有一定的现实意义.     

Apriori算法对高技能人才市场工资价位影响因素的实证分析

本文以广东为例,运用Apriori算法对广东高技能人才市场工资价位影响因素进行实证分析.研究结论认为影响高技能人才市场工资价位的主要因素与工种、地区、学历、技能、工龄、年龄有关,其中工种对收入的影响比其它都要大的多,特别是在分地区的分析中尤为明显.