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The spectrum sensing problem has gained new aspects with cognitive radio and opportunistic spectrum access concepts. It is one of the most challenging issues in cognitive radio systems. In this paper, a survey of spectrum sensing methodologies for cognitive radio is presented. Various aspects of spectrum sensing problem are studied from a cognitive radio perspective and multi-dimensional spectrum sensing concept is introduced. Challenges associated with spectrum sensing are given and enabling spectrum sensing methods are reviewed. The paper explains the cooperative sensing concept and its various forms. External sensing algorithms and other alternative sensing methods are discussed. Furthermore, statistical modeling of network traffic and utilization of these models for prediction of primary user behavior is studied. Finally, sensing features of some current wireless standards are given.

this is a matlab code with a gui that designs a shaft depending on the type of material needed the loads acting on it and the factor of safety

这个程序是采用牛顿法来进行潮流计算，系统的参数需要手动输入，相关的说明在程序里有,需要输入两个矩阵，节点和线路的矩阵(This program is the use of the Newton method for power flow calculation, the parameters of the system need to manually enter the description in the program)

采用CP算法求解分形维数(Using CP algorithm to solve fractal dimension)

说明：  matlab pwm整流器网侧变流器仿真(Simulation of grid-side converter)

比较复杂的可进行修改扩展的遗传算法源程序，带有说明文档(Complex can be extended to modify the genetic algorithm source code, with documentation)

噪声信号产生软件，非常不错的，大家可以下载试试，一个简单产生白噪声的软件(Noise signal generator software, very good, we can try to download a simple software generates white noise)

HHT算法的Matlab源程序，附有配套说明文件(Program for HHT in matlab.Help included.)

这是一个用matlab编写的构建网络连通支配集的程序。(Build a network connected dominating set of procedures)

在matlab上的FDTD程序关于一维时域有限差分(Matlab program on the one-dimensional FDTD finite difference time domain)