Yazar "Yazici, Emre" seçeneğine göre listele

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    Öğe
    Determination of Bid Values for High Speed Train Superstructure Tenders by Game Theory
    (Turkish Chamber Civil Engineers, 2022) Alakas, Haci Mehmet; Kacar, Cem; Yazici, Emre
    The use of high-speed trains (YHT) is increasing for the world's speed and competitiveness in rail transport. In Turkey, new lines have been built for the development of the railway in recent years. This study, it is aimed to create a mathematical model to determine the final bid price in the superstructure and electromechanical construction works of the YHT lines built in Turkey. Game theory was used to analyze the conflict of interest between contractors or bidders in the mathematical model. In the model, the bid distributions were determined by using the bids given in the previous bids. To minimize the degree of the winner's curse in determining the final bid price, a mathematical model is proposed using an empirical approach, using past bids. The competitive final bid price of the superstructure and electromechanical works of the superstructure and electromechanical works of the new YHT railway lines can be calculated in the standards of the previous tenders examined with the mathematical model.
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    Öğe
    Evaluation of supply sustainability of vaccine alternatives with multi-criteria decision-making methods
    (Wiley, 2022) Yazici, Emre; Uner, Sabire Irem; Demir, Asli; Dinler, Sevda; Alakas, Haci Mehmet
    Background: The treatment of the COVID-19 epidemic, whose contagious features are changing day by day, is the most current problem today throughout of the world. In order to be protected from COVID-19 and reduce its spread, it is of great importance to follow the rules such as mask, distance and hygiene. In addition, one of the most important ways to prevent the epidemic is to develop population immunity. The most important tool in having population immunity is vaccination. Aims: During the COVID-19 pandemic, there have been problems in the supply process of many products in food and health sectors. Vaccine is also one of the most difficult tools to supply. In this context, the study focused on the selection of the vaccine provided by the countries within the scope of population vaccination studies. Materials & Methods: At the selection point, the criteria affecting the purchasing process were determined and the weights of these criteria were calculated using the AHP method. Then, the criteria weights obtained were used to rank the alternatives in an integrated manner in the Preference Ranking Organization Method for Enrichment of Evaluations (PROMETHEE) and Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) methods. The results of both methods were analyzed comparatively. Results: According to the TOPSIS Method, the first alternative is Oxford-AstraZeneca for all countries, and BioNTech for all countries in the PROMETHEE method. Discussion: The vaccine storage conditions criterion is the most important in vaccine supply. The criterion with the lowest importance is Supply Cost. It has been revealed that cost elements remain in the background under pandemic conditions. Conclusion: Vaccine evaluation studies and policy recommendations are presented by considering public health in the selection of vaccine alternatives.
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    Öğe
    Evaluation of the companies for applied education under fuzzy environment: a case in an industrial university
    (Springer London Ltd, 2023) Ciftci, Sema; Pinarbasi, Mehmet; Yazici, Emre; Alakas, Haci Mehmet
    Nowadays, the problem of university graduates being unemployed is gradually increasing. To keep down unemployment, universities are integrating the concept of applied education into their educational curricula. The concept of applied education brings with it the problem of the correct student-company matching. In this study, the company selection criteria were focused on to determine the companies that university students will be sent to within the scope of applied education. Company selection criteria are determined by experts in the field. However, the evaluation of experts with precise criteria values can be very challenging in the decision-making process. For this purpose, the criteria weights were calculated using the Pythagorean Fuzzy AHP method in this study. Evaluation of companies to which students will be matched for applied/workplace education is ranked with these fuzzy weights by using TOPSIS and PROMETHEE II methods. To evaluation the proposed decision process, a real case study is carried out in an industrial private university in Turkey. The case study results show that the proposed method can provide effective and consistent results in the evaluation of companies under fuzzy environment.