Browsing by Author "Akpinar, Sener"

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Citation - WoS: 2
Citation - Scopus: 2
A two-stage real world serial batching scheduling problem: a case study
(TAYLOR & FRANCIS LTD, 2024) Sadik Serhat Karakutuk; Sener Akpinar; Mustafa Arslan Ornek; Akpinar, Sener; Ornek, Mustafa Arslan; Karakutuk, Sadik Serhat
This paper concerns a real-life production management problem composed of two stages which includes interdependent batch scheduling problems. Moreover both stages require setup operations at the beginning and between the subsequent batches. From the optimisation point of view this production management problem is complying with customers' deadlines and hence minimising total lateness. To achieve this objective the production planner must identify optimum or near-optimum batch schedules for both stages. Correspondingly this paper aims to develop a methodology to manage the related production problem as accurately as possible. We formulate an optimisation model that employs the mathematical programming method in line with this. Afterwards an algorithmic proposal based on the simulated annealing algorithm is also developed to solve the problem in realistic sizes. The computational capabilities of the developed model and the algorithm are evaluated on the randomly generated problem sets. A direct comparison between the mathematical model and the algorithm shows how efficiently the proposed algorithm solves real-world problems. Also computational results indicate that the proposed algorithm satisfactorily solves the related real-world batch scheduling problem.
Citation - WoS: 7
Citation - Scopus: 9
An application of a circular economy approach to design an energy-efficient heat recovery system
(ELSEVIER SCI LTD, 2021) S. Serhat Karakutuk; Sener Akpinar; M. Arslan Ornek; Akpinar, Sener; Ornek, M. Arslan; Karakutuk, S. Serhat
This paper aims to develop an optimal real-life energy-efficient design for a production plant within the concept of the circular economy. The problem is to install a Heat Recovery System (HRS) that utilizes the hot oil used by the compressors to heat the water for the central heating system. To achieve the desired level of energy efficiency this design problem must be formulated from both the optimization and sustainability points of view. Additionally this design problem must also consider the investment cost. In line with this purpose this paper formulates this design problem as an optimization problem employing a mathematical programming approach as a single objective and as a multi-objective optimization problem through a goal programming approach. Besides this paper uses the return on investment as a key performance indicator since it deals with a real-life design problem with an investment cost. The related design problem is solved with the single objective and multiobjective versions of the developed mathematical programming model via a commercial solver to identify different design alternatives and hence giving the decision-maker to make a selection option. Finally the capability of the developed mathematical programming model is tested on a set of randomly generated problems. The obtained results indicate that the developed mathematical programming model is a successful decision support system since its single and multi-objective versions are capable of identifying energy-efficient production designs within the context of the real-life problem on hand and the circular economy.