this paper is a research on the ordering planning of a supply chain with one supplier, multi buyer and multi deteriorating items. items have fixed life time and expire dates. the ordering period is taken as variable and must be computed the proposed models. the problem is studied via two different approaches the first is the joint replenishment, based on the hwang and chew's model [3] and ...

The US, the UK, and Netherlands face throwing away tens of thousands covid-19 vaccine doses that are due to expire. The US had already thrown out more than 180 000 by end March,1 some states, including Iowa Arkansas, have warned they set expire soon. Meanwhile, administrators in UK now report too having discard doses, as strict rules around dosing intervals fewer people coming forward for thei...