en و موضوعات مربوط Other Related Subject پژوهشي Research This paper focused on scheduling problems arising in a two-machine, identical parts robotic cell configured in a flow shop. Through current research, a mathematical programming model on minimizing cycle time as well operational cost, considering availability of robotic cell as a constraint, is proposed to search for the optimum allocation and schedule of operations to these two machines. Two solution procedures, including weighted sum method and ∊-constraint method are provided. Based on the weighted sum method, like some previous studies, sensitivity analysis on model parameters were done and the optimum solutions were compared with previous results, while the ∊-constraint method can find the Pareto optimal solutions for problems with up to 18 operations in a reasonable time. Robotic manufacturing cell, Scheduling, Breakdowns, weighted sum method, ∊-constraint method. 343 357 http://ijiepr.iust.ac.ir/browse.php?a_code=A-10-609-2&slc_lang=en&sid=1 Bahareh Vaisi st_b_vaisi@azad.ac.ir 180031947532846005550 180031947532846005550 No School of Industrial Engineering South Tehran Branch, Islamic Azad University, Tehran, Iran Hiwa Farughi h.farughi@uok.ac.ir 180031947532846005551 180031947532846005551 Yes Department of Engineering, University of Kurdistan, Sanandaj, Iran Sadigh Raissi Raissi@azad.ac.ir 180031947532846005552 180031947532846005552 No School of Industrial Engineering, South Tehran Branch, Islamic Azad University, Tehran, Iran