Thesis Defense - Meryem Merve Dereli (MSIE)

Meryem Merve Dereli - M.Sc. Industrial Engineering

Asst. Prof. Mehmet Önal – Advisor

Date: 18.08.2021

Time: 17:00

Location: This meeting will be held ONLINE. Please send an e-mail to gizem.bakir@ozyegin.edu.tr in order to participate in this defense.

Economic Lot Sizing Problem with Tank Scheduling

Thesis Committee:

Asst. Prof. Mehmet Önal, Özyeğin University

Asst. Prof. İhsan Yanıkoğlu, Özyeğin University

Assoc. Prof. Sabri Tankut Atan, Bahçeşehir University

Abstract:

In this study, we consider an Economic Lot sizing Problem with Tank Scheduling (ELSTS). The problem is a real-world problem, which is generally found in fermented beverage and food facilities. A facility might produce an item or several different items which have various fermentation times. The facility might have a tank or several identical or non-identical tanks to produce items. If a tank starts the fermentation process of an item, the tank will not be available to produce any item until its fermentation process is completed. Setup costs when tanks are filled, production costs when tanks are discharged, inventory costs after production is completed are incurred. The aim is to determine the lowest cost tank schedule and production plan which satisfies demands within a given finite planning horizon. Within the scope of the study, we analysed NP-hardness and solution methods of various variants of the ELSTS problem. In addition, for a variant of the ELSTS problem, which is classified as NP-Hard (multi-item that has different fermentation time and multi identical parallel machine), a new heuristic method is proposed to find a near-optimal solution. The proposed heuristic method is compared with a mixed-integer programming model, and that the heuristic method gives good solutions within seconds is observed.

Bio: 

Meryem Merve Dereli graduated from Nalan Kaynak Anatolian High School in 2013. She received her B.Sc. degree in Industrial Engineering from Özyeğin University in August 2018. After graduation, she joined the Master of Science program in Industrial Engineering at Özyeğin University and has been working under the supervision of Asst. Prof. Mehmet Önal. Her research focuses on the economic lot-sizing problem with tank scheduling.