The first objective of the developed model is to minimize the total costs of intra-cell and inter-cell material handling, machine relocation, machine purchase, machine overhead, machine processing, forming cells, outsourcing and inventory holding.
The objective is to minimize the sum of the depreciation and relocation machine cost as well as inter and intra-cell movements cost.
The objective function of the integrated model is to minimize the total costs of machine constant, machine procurement, machine relocation, machine operation, inter-cell and intra-cell movement, overtime, shifting labors between cells and inventory holding.
The objective function seeks to minimize total costs including machine constant, machine procurement, machine relocation, machine operation, inter-cell and intra-cell movement, overtime, shifting labors between cells and inventory holding.
Mathematical model is formulated to generate optimal dynamic cells that can ensure minimum costs of machine relocation, machine setup and inter-cell material handling in labor-intensive production environments subjected to machine breakdowns.
Objective function of the mathematical model developed by Sakhaii et al. (2016) sought to minimize the costs of inter- and intra-cell material handling, operator training and hiring, machine relocation, machine breakdowns, inventory holding and backorder.
In this section, a new mixed-integer nonlinear programming model of a DCMS integrating CF, PP and worker assignment is presented to minimize total costs including machine constant, machine procurement, machine relocation, machine operation, inter-cell and intra-cell movement, overtime, shifting labors between cells and inventory holding respecting to the following assumptions.
Totally, the number of inter-cell movements and the number of machines decrease; as a result, the relocation cost, machine constant cost and inter-cell movement cost become lower.
Possible scenarios of machine relocations in the developed model can be listed as follows: i) Moving machines between different cells, ii) Moving machines between cells and setup area. .
The cost to relocate a machine is also assumed to be linearly related to the relocation distance.
