Browsing by Author "Önal, Mehmet"
Now showing items 1-15 of 15
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An adaptive large neighborhood search for the multi-compartment inventory routing problem
Gültekin, Ceren (2021-06-10)In this thesis study, we concentrate on an inventory routing problem with a fleet of multi-compartment vehicles which enables the distribution of different products to customers on a delivery route. Using separate compartments ... -
An application for a particleboard plant: Web-based decision support system for quality prediction and digital transformation
As it is same for most of the production procedures, a certain quality level must be derived in the particle board production. In the particleboard production, a series of samples taken from the production line for the ... -
Economic lot sizing problem with inventory dependent demand
Önal, Mehmet; Albey, Erinç (Springer Nature, 2020-11)We consider an economic lot sizing problem where the demand in a period is a piecewise linear and concave function of the amount of the available inventory after production in that period. We show that the problem isNPhard ... -
Economic lot sizing problem with tank scheduling
Dereli, Meryem Merve (2021-08)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 ... -
Economic lot sizing problem with tank scheduling
Önal, Mehmet; van den Heuvel, W.; Dereli, Meryem Merve; Albey, Erinç (Elsevier, 2023-07-01)We introduce a multiple-item economic lot sizing problem where items are produced through the fermentation of some raw materials. Fermentation takes place in specialized tanks that have finite capacities, and duration of ... -
An EOQ model with deteriorating items and self-selection constraints
Önal, Mehmet; Kundakcıoğlu, Ömer Erhun (Springer Nature, 2020-09)In this paper, we consider a store that sells two vertically differentiated items that might substitute each other. These items do not only differ in quality and price, but they also target two different customer segments. ... -
Mathematical modeling and math heuristic approach for shift selection, lot sizing and worker assignment problem of Vestel
The simultaneous lot sizing and scheduling studies do not implement a worker assignment problem in the literature. This study provides a solution for worker assignment problems with overtime constraints of the Government. ... -
A mathematical modelling approach for dled TV panel design
Kurt, Olkan (2019-06)The aim of this study is to increase the luminance performance of direct light emitting diodes (DLED) televisions through case design improvement. We first gather luminance measurements of several regions of active area ... -
Multi-compartment inventory routing problem with adjustable compartment sizes
Ölmez, Ömer Berk (2021-06-10)In this study, we focus on a problem where the supplier manages the customers’ in ventories and coordinates the distribution of multiple products to customers. Hereby the supplier can minimize the transportation costs by ... -
A multistage scenario optimization procedure for capacity planning in TV production final assembly lines
Vestel Electronics is a large-scale TV producer that has an important share in the European television market. High End Factory, where Vestel assembles 20 different TVs in size, consists of 14 final assembly lines. High ... -
Nonidentical parallel machine scheduling with time-dependent deterioration of jobs
We consider scheduling of deteriorating jobs on nonidentical parallel machines where the objective is to minimize mean flow time while ensuring the average value (i.e., quality) of processed jobs on machines exceeds a ... -
An occupant-oriented circular model for facility management strategy
Memiş, Doğa Gizem (2018-08)Facility management (FM) concept should be re-considered for the next generation of strategic operations of buildings and should be human-focused. Traditional FM strategies are based on designs by the stakeholders and ... -
A split delivery vehicle routing problem for daily tobacco delivery
One of the Turkey's largest cigarette manufacturer, located in Izmir, receives distributors' orders from all over Turkey every day. Processed and packed cigarettes are distributed to all distributors in different locations ... -
Stochastic scheduling of operating rooms and reusable medical devices: a simulation optimization approach
Farajkhah, Seyyed Kian (2019-08-08)Health care expenditures are expected to grow every year, and more than 40% of a hospital's total expenses and revenues are generated by surgical surgeries. One of the major resources required during surgeries are reusable ... -
Testing and scheduling applications under uncertainty
Yavuz, Tonguç (2021-02)In this thesis, we consider two different optimization problems under uncertainty. The first problem is identifying defective components in failed k-out-of-n systems. In the second part, we study the parallel machine ...
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