I, Zhang He, Help Liu Bei Restore the Han Dynasty

Zhang He, a modern science student, is transported to the end of the Eastern Han Dynasty while looking at his phone, arriving on the Guandu battlefield in the fifth year of Jian'an. To his astonishment, he has become Zhang He, still serving Yuan Shao. With Yuan Shao on the verge of defeat, and Zhang He himself a fan of Shu Han, he decides to take Gao Lan and his other subordinates to Runan to join Liu Bei.

What changes might Zhang He, armed with modern knowledge and a modern outlook, bring to the future Shu Han?