id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
cet-15006		cet-15006		6	.pdf	application/pdf	3565	162	46	Model formulation Two optimization models were developed using the following assumptions: (1) a unit of each final product requires a certain number of raw material j, (2) the amount of the final product is known, (3) the differences in 602 the production process and efficiency of each supplier i lead to differences in production cost and CO2 emission per raw material, and finally (4) this study considers a manufacturing plant that acquires raw materials locally. Each demand for raw material (j) from source (i) has a corresponding CO2 emission (eij), purchase cost (cij), and topological connectivity value (bij), which is a binary variable that ensures that there is a connection between supplier i and the demand for raw material j. Figure 1: System in consideration	cache/cet-15006.pdf	txt/cet-15006.txt