This thesis aims to clearly describe the cognitive radio and its components and operations. Moreover, it aims on describing the expected outcome from the most common techniques that are proposed for use in cognitive radios. In addition, it describes

认知无线电中基于干扰图模型的动态频谱分配。此程序是基于固定干扰图模型的分析代码-Cognitive radio interference graph model based on the dynamic spectrum allocation. This procedure is based on the analysis of the fixed interference graph model code

　　MSC.NASTRAN的主要动力学分析功能如：特征模态分析、 直接复特征值分析、 直接瞬态响 应分析、 模态瞬态响应分析、 响应谱分析、 模态复特征值分析、 直接频率响应分析、模态频率响应分析、 非线性瞬态分析、 模态综合、 动力灵敏度分析等。-The main kinetic analysis functions in MSC.NASTRAN such as: characteristics of modal analysis, direct complex eigenvalue anal