Rough Set theory

Today I read through the paper of Dr.Chen Qingcai. In his paper rough set theory has been used very often.

It can be used in changeing pinyin into words, and reducting the baseline words for computing similitude degree of words.

A doctorial paper is very ample. I have found the difficult of it.
But at the same time I find out that grey system, like rough set, can be used widely into Chinese Information Processing. But the foundation of Chinese Information Processing and Grey system should be combined. In order to do so, I should learn more of them.

Try, and again.