A Stochastic Model for Prioritized Outpatient Scheduling in a Radiology Center

Zeinab Abtahi | Rashed Sahraeian | Donya Rahmani

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URL :   http://research.shahed.ac.ir/WSR/WebPages/Report/PaperView.aspx?PaperID=137516
Date :  2020/04/13
Publish in :    International Journal of Engineering Transactions A: Basics
DOI :  https://doi.org/10.5829/ije.2020.33.04a.11

Keywords :Scheduling, Stochastic, Flexible Open Shop, Prioritized Outpatient, Heuristic, Mixed Integer Linear Programming

Abstract :

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This paper discussed the scheduling problem of outpatients in a radiology center with an emphasis on priority. For more compatibility to real-world conditions, we assume that the elapsed times in different stages to be uncertain that follow from the specific distribution function. The objective is to minimize outpatients’ total spent time in a radiology center. The problem is formulated as a flexible open shop scheduling problem and a stochastic programming model. By considering the specific distribution function for uncertain variables, deterministic mixed integer linear programming (MILP) is developed such that the proposed problem can be solved by a linear programming solver in small size. Besides an effective heuristic method is proposed for the moderate size problem. To indicate the applicability of the proposed model, it has been applied to a real radiology center. The results from the proposed optimization models indicate an increase in outpatients’ satisfaction, as well as the improvement of the efficiency and productivity of the radiology center.