一款利用matlab编写的射线追踪程序，易改易用。-The installation of TTBOX is relatively simple. All you have to do is to create some directories and tell MatLab, where TTBOX is. if it does not already exist, create a directory matlab within your home directory.

定时抓取制定的网页的数据并且存贮到数据库里-periodically grab the web contents and insert into

Most areas of computer science focus on achieving functionality: putting some system together and making it work. By contrast, security and cryptography focus on achieving functionality in the presence of an attacker. With the emergence of e-crime as