Zhou Dunyi (1017–1073) (traditional Chinese: 周敦頤; simplified Chinese: 周敦颐; pinyin: Zhōu Dūnyí; Wade–Giles: Chou Tun-i), born Zhou Dunshi (周敦實), courtesy name Maoshu (茂叔), was a Chinese Neo-Confucian philosopher and cosmologist born in present-day Yongzhou during the Song Dynasty. He conceptualized the Neo-Confucian cosmology of the day, explaining the relationship between human conduct and universal forces. In this way, he emphasizes that humans can master their qi ("vital life energy") in order to accord with nature. He was a major influence to Zhu Xi, who was the architect of Neo-Confucianism. Zhou Dunyi was mainly concerned with Taiji (supreme polarity) and Wuji (limitless potential), the yin and yang, and the wu xing (the five phases). He is also venerated and credited in Taoism as the first philosopher to popularize the concept of the taijitu, or "yin-yang symbol".[1][2]
[1] http://en.wikipedia.org/wiki/Zhou_Dunyi
[2] 人物: 周敦頤 (ZHOU Dunyi, 1017–1073)