THIS IS REPLENSHIPMENT INVENTORY CONTROL POLICY

environment:
1.cost evaluation:lost-sales,backlog
2.demand: known,distribution known, distribution unknown but i.i.d , distribution unknown
3.review frequency: periodic,continuous


agent:
1.Traditional 
    a.Base stock
	b.lower upper 
	c.constant order
2.Data Driven trend(recent paper realizaiton)
	a.
	b.