Order level inventory system with ramp type demand rate for deteriorating items

An EPQ model with trapezoidal demand under volume flexibility

“…Manna and Chaudhuri (2006) studied an EPQ model with ramp-type two time periods categorized demand pattern assuming demand dependent production. Deng et al (2007) focussed on the doubtful results found by Mandal and Pal (1998) and Wu and Ouyang (2000) and obtained a more consistent solution. Panda et al (2008Panda et al ( , 2009 extended Giri et al's (2003) one-fold demand model to two-fold demand.…”

“…Since then several researchers and practitioners have paid significant consideration to study ramp-type demand. Mandal and Pal (1998) developed the EOQ model with ramp-type demand for exponentially deteriorating items with shortages. Wu and Ouyang (2000) investigated two inventory models assuming different replenishment policies: one started with shortage and another had shortage after inventory consumption.…”

Analysis of an Inventory System with Ramp Type Demand Rate, Partial Shortages under Inflation and Learning

“…Based on such realistic facts, Hill proposed an inventory model with ramp type demand rate. Mandal and Pal [1998] extended this model to allow shortages. Further, Wu [2001] extended it to have Weibull distribution deterioration and time dependent backlogging.…”

An inventory model with ramp type demand, time varying holding cost and price discount on backorders

“…Hill (1995) first considered the inventory models for increasing demand followed by a constant demand. Mandal and Pal (1998) extended the Hill's inventory model for deteriorating items and allowing shortage. Wu et al (1999) constructed the inventory model with ramp type demand rate such that the inventory period is longer than the linear increasing period of the demand.…”