英语形容词的句法功能及认知分类

从英语形容词的句法功能角度出发,发现英语形容词可以作表语、定语、宾语补足语和主语补足语、状语以及用作独立成分.同时,根据认知语言学对英语形容词进行分类.     

基于FFT的扩频通信系统抗干扰技术研究

针对无线信道中的高斯白噪声、窄带干扰问题,采用重叠变换的FFT频域陷波算法对相关干扰进行削弱或消除,并将其在扩频通信系统中进行了仿真分析。结果表明,这项技术可使受干扰后的频谱泄露大大降低,从而减少了信号的损伤,提高了信息传输的准确性、可靠性。     

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.     

二维抛物型方程非齐次边值问题的高精度差分格式

针对二维非齐次抛物型方程提出了高精度紧致差分格式，本文将把在[2]中二维问题的差分格式在空间方向上提高到四阶，对其进行了收敛性分析，证明其收敛阶为o（△t^2＋hx^4＋hy^4），并采用ADI算法将二维问题降为一阶求解。     

基于遗传算法的网络入侵检测系统设计

经过对入侵检测历史与现状的分析和对目前入侵检测技术的研究。本提出一种基于遗传算法的网络入侵检测系统模型。在分析引擎的设计上，采用了协议分析和遗传算法相结合的策略，使入侵检测的速度和准确性有了显提高。     

Coping with handover effects in video streaming over cellular networks

The 3rd generation partnership project (3GPP) has defined the protocols and codecs for implementing media streaming services over packet-switched 3G mobile networks. The specification is based on IETF RFCs on audio/video transport. It also adds new features to achieve better adaptation to the mobile network environment. In this paper, we propose an algorithm for handover detection and fast buffer refill that is based on the existing feedback and signaling mechanisms. The proposed algorithm refills the receiver buffer at a faster pace during a limited time frame after a hard handover is detected in order to achieve higher video quality.     

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。