liziqun

实现聚类K均值算法： K均值算法：给定类的个数K，将n个对象分到K个类中去，使得类内对象之间的相似性最大，而类之间的相似性最小。 缺点：产生类的大小相差不会很大，对于脏数据很敏感。 改进的算法：k—medoids 方法。这儿选取一个对象叫做mediod来代替上面的中心 的作用，这样的一个medoid就标识了这个类。步骤： 1，任意选取K个对象作为medoids（O1,O2,…Oi…Ok）。 以下是循环的： 2，将余下的对象分到各个类中去（根据与medoid最相近的原则）； 3，对于每个类（Oi）中，顺序选取一个Or，计算用Or代替Oi后的消耗—E（Or）。选择E最小的那个Or来代替Oi。这样K个medoids就改变了，下面就再转到2。 4，这样循环直到K个medoids固定下来。 这种算法对于脏数据和异常数据不敏感，但计算量显然要比K均值要大，一般只适合小数据量。(achieving K-mean clustering algorithms : K-means algorithm : given the number of Class K, n will be assigned to target K to 000 category, making target category of the similarity between the largest category of the similarity between the smallest. Disadvantages : class size have no great difference for dirty data is very sensitive. Improved algorithms : k-medoids methods. Here a selection of objects called mediod to replace the center of the above, the logo on a medoid this category. Steps : 1, arbitrary selection of objects as K medoids (O1, O2, Ok ... ... Oi). Following is a cycle : 2, the remaining targets assigned to each category (in accordance with the closest medoid principle); 3, for each category (Oi), the order of selection of a Or, calculated Oi Or replace the consumption-E (Or))

homework 3-5 is difficult

通过matlab 程序，计算rainflow的值，验证疲劳载荷是否合格(rainflow ，load)

用来计算旋转45度的矩形块的haarlike特征(Calculation rotated 45 degrees haarlike characteristics)

通过matlab实现CIC滤波器的性能仿真，并通过FPGA进行CIC的硬件实现和仿真.性能较好(Through the CIC to achieve the performance of the MATLAB filter simulation, and through the FPGA CIC hardware implementation and simulation.)

ukf的程序，主要将其应用于目标跟踪方面(ekf s programme ,it s fitted to track traget.)

说明：  通信原理的系统仿真系列--code&decode for QDPSK。供刚接触到matlab的朋友参考。(communications system simulation series-- code)

二维FDTD TE波圆柱仿真 频率 波长 圆柱的周长，改变圆柱的尺寸 每最小波长20个采样点 划分的网格数(Two dimensional FDTD TE wave cylindrical simulation frequency wavelength cylindrical perimeter, change the size of the minimum wavelength of each cylinder of20 sampling points of grid number)

非线性控制的描述函数法，非常经典的书籍 适合于入门学习(Nonlinear Control describing function method, a very classic books suitable for beginners to learn)

说明：  单相桥式整流电路闭环相控调压，simulink中搭建单相桥式整流电路，利用PI控制方式，实现输出电压的相控(The single-phase bridge rectifier circuit is closed-loop phase controlled voltage regulation, the single-phase bridge rectifier circuit is built in Simulink, and the PI control mode is used to realize the phase control of output voltage)