Ua ntau tshaj 30 xyoo, tam sim no peb yog cov chaw tsim khoom ntawm cov cuab yeej kho qhov muag hauv Suav teb. Peb muaj ntau tus kws tshaj lij cov kws tshaj lij thiab cov neeg ua haujlwm txawj. Muaj ntau yam khoom siv kho qhov muag-hluav taws xob tau siv hauv cov txheej txheem thev naus laus zis. Raws li kev tshawb fawb kev tshawb fawb kom zoo dua ntawm North University of China, peb tau tsim ntau lub factorial thiab multi directional khoom, kev tswj thiab kev muag khoom.