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    A new fuzzy approach in risk assessment with process capability for air pollution
    (Taylor & Francis Inc, 2023) Oturakci, Murat; Dagsuyu, Cansu; Derse, Onur
    Today, the reasons such as the development of technology and industry, the increase in the population and the number of vehicles cause air pollution to increase constantly. Many different components cause air pollution, and increased air pollution poses serious risks to both human health (respiratory distress, eye diseases, physical distress, cancer, etc.) and nature (acid rains). In this study, a new risk analysis approach has been applied for the risks that may occur by considering the component data of SO2, NO2, CO, O-3, and PM(10)causing air pollution from the measurement stations in Ankara, the capital city of Turkey. In this new approach, the integrated risk analysis (RPN with Cp) method has been developed by calculating the Cp values that take into account the spread for the parameter values of the stations. According to the risk assessment results, the most critical hazards were revealed for each component and a fuzzy model was established based on these hazards. With the fuzzy model, risk scores in different ranges are evaluated in a single range and the critical levels of the measurement stations are ranked. According to the results of the study, two of the seven stations are medium-high; two are medium; two of them are medium-low and the remaining one station is placed in the low category. Since the low category is considered as an acceptable risk class in risk analyzes, stations in the medium-high and medium class, which make up 57% of the stations, can be considered critical.
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    Öğe
    Integrated risk prioritization and action selection for cold chain
    (Springer Heidelberg, 2021) Dagsuyu, Cansu; Derse, Onur; Oturakci, Murat
    Cold chain, which affects human health and quality of life, is applied for temperature-sensitive and perishable products. Any problems occurring in the cold chain can cause deterioration in products, causing poisoning, death, or various diseases. There are many stages in the cold chain itself and the risk significance level of each stage is different. Therefore, the risks that occur depending on the weight of the stages in the cold chain should be defined and minimized and action plans are needed to be formed. Every action in the action plan cannot be implemented simultaneously since each action requires a different amount of budget and time resources of the companies are finite. Hence, the risks occurring in the cold chain should be minimized with the maximum use of limited company resources. In this study, an integrated mathematical model with analytical hierarchy method and failure mode and effect analysis is proposed that will maximize the weighted risk reduction amount by considering the budget and time constraints of the companies at the same time. The proposed approach has been applied in the 3PL service provider and the results are discussed. According to the results of the study where maximum benefit is aimed with the actions taken against the dangers, the maximum objective function value was obtained at the second and third levels of the workforce and budget values by evaluating the different situations with scenario analyses. In this solution, it is foreseen that by taking 5 actions, improvement will be made in 14 hazards.
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    Öğe
    Risk Analysis Application to Hazardous Material Transportation Modes
    (Sage Publications Inc, 2022) Derse, Onur; Oturakci, Murat; Dagsuyu, Cansu
    Hazardous material transportation is a significant issue in relation to both environment and humanity. In recent years, studies and attempts to minimize the risks of hazardous material transportation or selection of transportation mode to reduce potential hazards have increased. This study aims to evaluate the hazards arising from each stage of hazardous material transport modes and the risks arising from these hazards with an integrated approach simultaneously. Fault tree analysis (FTA) is used to evaluate hazardous material transportation modes with their stage components; probabilities of potential hazards are calculated for the risks arising from those hazards and evaluated with The Decision Making Trial and Evaluation Laboratory (DEMATEL) approach. Last, to determine the critical levels of transportation modes, calculated risk scores and parameters that affect those transportation modes, such as speed, cost, and capacity, are assessed with Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) and DEMATEL approach. Ultimately, critical levels of transportation modes are ranked as highway, marine and inland, airway, and railway.