The explanation below is for reference only.
Please do double check with the dept. office, R&D office, and NSC for the most updated and correct information.
Before you leave for your conference trip, according to school's regulations, you need to fill out the forms attached before you leave and send to dept. office for chair and school's approval.
 
1. 教師請假單 Teacher's leave of absence form
 
2. 出國差旅申請單 Application for business trip
 
You don't need to keep the receipts from hotel and food
When you come back, there will be a report for you to fill out and sign and it would be considered as the receipt for living expense.
The receipts you need to keep are flight tickets(with 統一編號), boarding pass, and conference registration.
 
If you take non-Chinese airlines, you need  fill out another form to explain why you need to take other airlines. (E.g. a cheaper price, better timing, etc. )
 
Best,
Grace