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    Analysis of quality control criteria in an business with the fuzzy DEMATEL method: Glass business example
    (Academic Publication Council, 2023) Celik, Mirac Tuba; Arslankaya, Seher
    Quality is at the forefront of the issues to which the production and service sectors attach importance. Increasing customer satisfaction, gaining competitive advantage in the industry, increase in sales vb. for many reasons, companies have increased the importance given to quality control. Before sending the products to the customer, taking into account the necessary quality control criteria, the control of the products will contribute to the solution of any problems that may arise in advance. Especially in sectors where energy and capital are intense, and the capacity is very high, it is one of the fundamental processes that should be done in the company, inspection of products taking into account all quality control criteria. Therefore, it is essential to consider the glass industry in this sense. This study determines the critical value of the quality control criteria on the glass, which a company that produces tempered glass pays attention to before putting the product used as a contract into production. Control criteria were determined by interviewing a team of experts in the company, and then the criteria were evaluated by experts. Then, fuzzy DEMATEL method, which is one of the multi-criteria deci-sion-making techniques, was used and the relations of the criteria with each other were determined. As a result of the calculations made with fuzzy DEMATEL, the criteria are listed as K1 > K2 > K4 > K7 > K6 > K5 > K3 and the aspect measurement with a criterion weight of 0,150 was found to have the most significant effect on the glass.
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    Real-time detection of plastic part surface defects using deep learning-based object detection model
    (Elsevier Sci Ltd, 2024) Celik, Mirac Tuba; Arslankaya, Seher; Yildiz, Aytac
    In this study, it was aimed to detect defects in plastic parts produced in a company operating in the automotive sub -industry using the YOLOv8 object detection model. The defect types seen in plastic parts were evaluated with the help of Pareto analysis, and scratches, stains and shine were selected as the most common defect types, and data on the three defect types were collected. YOLOv8 models were trained using faulty part images. As a result of the training, the highest mean average precision value of 0.990 was obtained in the YOLOv8s model, and the shortest training time was obtained in the YOLOv8n model. In the YOLOv8s model, which gave the highest mAP value, hyperparameter adjustment was made according to the batch size and learning rate values. The testing phase was carried out with the hyperparameter values that gave the best results and the mAP value was obtained as 0.902.
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    Solution of the assembly line balancing problem using the rank positional weight method and Kilbridge and Wester heuristics method: An application in the cable industry
    (Academic Publication Council, 2023) Celik, Mirac Tuba; Arslankaya, Seher
    Today, assembly lines are frequently used in factories' production areas because they increase production processes' efficiency. Due to increased customer demands, increasing production amounts and intense competition cause severe fluctuations in production environments. This is also evident in assembly lines. Balancing problems caused by many reasons in assembly lines has become a big problem for companies. In this study, the balancing problem in the assembly line in an automotive supplier industry company that produces cables has been tried to be solved. In the solution of the problem, the Rank positional weight method, which is among the heuristics frequently used in the literature, and the Kilbridge and Wester heuristics were used. Considering the current situation, the cycle time from 170 s has been reduced to 142.25 s, and the line efficiency has been increased from 82.36% to 98.42%. There was no increase or decrease in the number of stations on the line and the number of operators working there. As a result of all these efforts, the workload was distributed equally among the stations, severely reducing waiting time. In this way, the downtimes in production were reduced, the overtime hours required to reach the required daily production amount were eliminated, and labor costs were reduced.