DCOOFDM-(1)

This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. (This is a JPEG encoding & decoding program of still image. It does not use level shifting. Discrete Cosine transform (DCT) is performed both by classical & Chen s Flowgraph methods. Predefined JPEG quantization array & zigzag order are used here. RUN - LEVEL coding is used instead of Huffman coding. Compression ratio is compared for each DCT method. Effect of coarse and fine quantization is also examined. The execution time of 2 DCT methods is also checked. In addition, most energatic DCT coefficients are also applied to examine the effect in MatLab 7.4.0 R2007a. Input is 9 gray scale pictures & output is 9*9=81 pictures to compare. Blocking effect is obvious. )

This program permits you to use FFT under Matlab platform, you may change the fine function used as reference to calculate its FFT to any other function.Hope it helps you.

it is for wave solution that is good for all persen

MATLAB 数据挖掘算法，fuzzy-K-means聚类算法源(MATLAB data mining algorithms, fuzzy-K-means clustering algorithm source)

基于MATLAB的OFDM系统仿真及性能分析，比较实用(MATLAB based on the OFDM system simulation and performance analysis, more practical)

AC-DC-AC整流逆变电路，三相全桥逆变电路。。。。。。。(AC-DC-AC inverter circuit rectifier, three-phase full-bridge inverter circuit. . . . . . .)

两级单相并网逆变器模型（boost+逆变器）(Two stage single phase grid connected inverter (boost+ inverter)

说明：  用于ICSS算法中，计算累计平方和函数时使用，可以用于检验时间序列的方差变异(this program is used to calculate accumulative sum while processing ICSS arithmetic, and can be used to test the varianc variation of time series.)

介绍matlab中字符串、元胞和构架数组的建立、使用和用法(Introduction matlab in the string array of cellular and framework of the establishment, use and usage)

RBF算法应用于声断层成像，根据探测器接收到声信号时间的差异，推导出区域的温度分布(RBF algorithm is applied to acoustic tomography, the detector receives the sound signal according to the time difference, the temperature distribution derived regional)