SNVisionDemo

各种Excel VBA编程的范例，非常有实用价值。(Various kind of codes for VBA application for data processing.)

tf–idf, short for term frequency–inverse document frequency, is a numerical statistic that is intended to reflect how important a word is to a document in a collection or corpus.[1]:8 It is often used as a weighting factor in information retrieval and text mining. The tf-idf value increases proportionally to the number of times a word appears in the document, but is offset by the frequency of the word in the corpus, which helps to control for the fact that some words are generally more common than others. Variations of the tf–idf weighting scheme are often used by search engines as a central tool in scoring and ranking a document s relevance given a user query. tf–idf can be successfully used for stop-words filtering in various subject fields including text summarization and classification. One of the simplest ranking functions is computed by summing the tf–idf for each query term many more sophisticated ranking functions are variants of this simple model.

介绍了16PSK与16QAM调制的概念，分析了调制的频带利用率和误码性能仿真，总结了16QAM调制和16PSK调制的优缺点。(Introduction of 16QAM modulation 16PSK with the concept of analysis of modulation bandwidth efficiency and BER simulation, summed up the 16PSK modulation 16QAM modulation and the advantages and disadvantages.)

项目中新增对FTP的支持，需求的变更是开发过程中不可避免的事情，只是变更的时间越靠近项目末期，就越是灾难。还好这个需求可以设计的相对独立，做到尽量不影响已实现部分。      说的FTP，就想起曾经写的一个FTP接口对象，由于现在FTP的实现库到处都是，因此在写好此对象时，被同事称为：做轮子的人～我的想法是，组装车和制作车应该还是有区别的～

格子Boltzmann方法模拟封闭方腔热自然对流(Lattice Boltzmann method to simulate a closed square cavity hot natural convection lattice Boltzmann method to simulate a closed square cavity natural convection heat)

Useful Generic Excel Macro s

CodeSigner implements Serializable Source Code for Andriod.

Wİ NDOWS 8.1 related with windows 8.1

重构代码设计 重构工程的经典书籍，详细阅读(restructuring code designer)

数字水印的C++实现,两段程序,转发别人的(Digital watermark C++ implementation, the two paragraph of the program, forwarding others.)