A novel mathematical model for a multi-period, multi-product optimal ordering problem considering expiry dates in a FEFO system

A sustainable supply chain for organic, conventional agro-food products: The role of demand substitution, climate change and public health

“…In Table 1, end customer's demand is categorized as a certain or uncertain parameter. According to Sazvar et al (2016), if the demand amount is predefined and given within the planning horizon, it is classified as a certain parameter (Pishvaee et al, 2012;Soysal et al, 2013;Nha Le & Lee, 2013); otherwise, it is considered as an uncertain parameter (Ruiz-Femenia et al, 2013;Pishvaee and Razmi, 2012). Some researchers such as Amin and Zhang (2013) have proposed a mathematical model considering certain demand.…”

Sustainable dynamic lot sizing models for cold products under carbon cap policy

“… √ √ Emission minimization Önal et al (2015) Single echelon √ √ √ √ None None Bozorgi (2016) Single echelon √ √ √ Fixed + Var. √ √ Emission minimization Muriana (2016) Single echelon √ √ √ √ None None Önal (2016) Two echelon √ √ √ √ Simplified None Pauls-Worm et al (2016) Single echelon √ √ √ √ √ None None Sazvar et al (2016) Single echelon √ √ √ √ None None Sargut and Isik (2017) Single echelon √ √ √ None None Hariga et al (2017) Multi echelon √ √ ...…”

“…A stream of researchers addressed the lot sizing problem of perishable products under the assumption of dynamic demand, including Soysal et al, 2014 , Pires et al, 2015 , Önal et al, 2015 , Önal, 2016 , Pauls-Worm et al, 2016 , Sazvar et al, 2016 as seen in Table 2 . Soysal et al (2014) put forward a sustainable optimization model for the network logistics problem of a beef supply chain, with cost and emission minimization as the two objectives.…”

“…While this latter work addressed single stage systems, Önal (2016) tackled the two-stage single-product lot sizing problem with fixed shelf life, proved the problem to be NP-hard, and presented special cases solvable within polynomial time. Following the FEFO consumption order, Sazvar et al (2016) developed the replenishment strategy for multiple perishable products with each product having a specific expiry date while allowing shortages to take place. Pauls-Worm et al (2016) studied the production planning problem of food items having a fixed shelf life, long production lead times and non-stationary stochastic demand.…”

Optimal pricing and inventory strategies for introducing a new product based on demand substitution effects

“…Same yogurts with different expiration dates have identical prices, and the ones which expire earlier are always moved to the front of the shelf for sale. It is called First Expired-First Out (FEFO) policy, meaning that products which are to expire soon should be served or removed from stock on a priority basis (Sazvar et al [16]). This is because there are customers who are insensitive about differences between new products and existing products, and retailers could earn higher profits by keeping the price of existing products the same(Sainathan [15]).…”