Integer Linear Programming Models for the Containership Stowage Problem

Table 10

Additional parameters and decision variables in four models based on the basic model.

Models	Parameters	Decision variables	Meaning
Improved model I		(binary)	=1 if the tier of ship bay is full of containers, and =0, otherwise
Model II	uH		The lowest tier number on the deck
Model III			The weight of containers loaded in ship tier a of ship bay b
			The destination of containers loaded in ship tier a of ship bay b
		(binary)	=1 if the containers on the deck are overstowed; =0, otherwise
Model IV	(binary)		=1 if t-containers are 20’; =0, otherwise
	(binary)		=1 if t-containers are 40’; =0, otherwise
	(binary)		=1 if t-containers are refrigerated; =0, otherwise
			The transformation coefficient of containers from the quantity to the TEU capacity
			The number of refrigerated slots in tier of block