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Öğe A new approach for environmental risk assessment(Taylor & Francis Inc, 2018) Kokangul, Ali; Polat, Ulviye; Dagsuyu, CansuEnvironmental problems, such as global warming, the limited supply of sustainable energy, the depletion of natural resources, hazardous emissions released into the atmosphere and waste, are increasing global concerns. Therefore, individuals, communities, and businesses need to address environmental protection and sustainability. Environmental impact assessments are needed to identify, mitigate, and control aspects that affect the environment or a company's products, services, or activities. In this study, a general environmental aspect and impact assessment approach, which can be applied to any company that is involved in the production or service sector, is created. An environmental impact pattern that consists of 10 main and 32 sub-categories was formed based on the ISO 14001, environmental studies and field applications. The developed approach was applied to the dyeing units of a manufacturing firm. Sixteen environmental aspects were identified and assessed using the environmental impact template via the environmental failure mode and effect analysis (E-FMEA) method. The developed-approach can be applied to each sector, which will enable us to perform a detailed analysis of the environmental aspects in the environmental impact category. This approach provides a checklist for the environmental impact studies of businesses and has been pioneered as an effective method for company resources to improve their environmental performance.Öğe A New Fine-Kinney Method Based on Clustering Approach(World Scientific Publ Co Pte Ltd, 2020) Dagsuyu, Cansu; Oturakci, Murat; Essiz, Esra SaracIn this study, a new approach to Fine-Kinney risk assessment method is developed in order to overcome the limitations of the conventional method with clustering algorithms. New risk level of classes are attempted to determine with K-Means and Hierarchical clustering algorithms with using two different distance functions which are Euclidean and Manhattan distances. According to the results, K-Means algorithms have provided accurate and sensitive cluster of classes. Classes from conventional and K-Means algorithms are applied and compared to the identified risks of a workshop of a medium sized textile company. Results of the study indicate that clustering techniques are new, original and applicable way to define new classes in order to prioritize risks by overcoming the drawbacks of conventional Fine-Kinney method.Öğe A new fuzzy approach in risk assessment with process capability for air pollution(Taylor & Francis Inc, 2023) Oturakci, Murat; Dagsuyu, Cansu; Derse, OnurToday, 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.Öğe Action selection in risk assessment with fuzzy Fine-Kinney-based AHP-TOPSIS approach: a case study in gas plant(Springer Heidelberg, 2022) Dogan, Bahar; Oturakci, Murat; Dagsuyu, CansuIn this study, the hazards occurring in a medium-sized gas filling facility were defined, and the risk scores of these hazards were determined by the expert team according to the Fine-Kinney risk analysis method. However, since the same risk significance score is obtained in different combinations of scale values in the classical Fine-Kinney risk analysis method and the characteristics/constraints of the company applied in the risk analysis are not taken into account, the hazards were evaluated using fuzzy Fine-Kinney risk analysis, and the most critical hazards were determined. Action plans are defined for critical hazards determined as a result of fuzzy Fine-Kinney risk analysis. Among the actions that require company resources, the action selection was performed with the TOPSIS method, taking into account their relationship with the hazards by integrating the weights, which was calculated with the AHP method, of affected groups. The effect of operating constraints is included in the last step of the study to calculate the final weights. Calculating the results by including the risk-affected groups and company constraints and ranking the actions reveals that the study is an original, objective, and applicable study.Öğe Catheter planning with goal programming method in neonatal intensive care unit(Wiley, 2022) Kokangul, Ali; Dagsuyu, CansuSuccessful treatment of diseases depends on many important factors: correct diagnosis, choice and type of equipment, and the risk of infectious diseases. It is crucial to take into these factors, in particular, the risk of infection and the costs of equipment in catheter selection for invasive interventions in neonatal intensive care units (NICUs). Catheters have different lifetime, therefore, the length of stay (LOS) is important for catheter selection. Random changes in patient's LOS make catheter selection a difficult problem. In this study, catheters designed for newborns in NICUs within the scope of invasive procedures have been optimized with multi-objective mathematical modeling method. Maximization of catheter additional lifetime, minimization of infection, and total cost have been provided by considering the actual data obtained from neonatal intensive care unit of large hospital in modeling.Öğe Characterization of boronized AISI 1050 steel and optimization of process parameters(Carl Hanser Verlag, 2019) Boztepe, Mete Han; Bayramoglu, Melih; Uzay, Cagri; Dagsuyu, Cansu; Kokangul, Ali; Geren, NecdetIn this study, AISI 1050 steel was boronized at temperatures of 800, 850, 900, 950 and 1000 degrees C for 3, 6, and 9 hours by means of a pack boronizing process. The formation of the boride layer was investigated. The characterization of the boronized surfaces was determined by X-ray diffraction (XRD) analysis and scanning electron microscopy (SEM). Although dual phase, FeB and Fe2B were observed in the boride layer, the intensity of the FeB was slight and collected only near the outer surface which is the desired structural morphology. As the boronizing temperature and holding time strongly affect the results of both boride layer thickness and the surface hardness of the material, multi-objective mathematical models were developed for optimization. Energy consumption during boronizing was also considered. Hence, the optimum values for both temperature and holding time were determined, both of which maximize surface hardness and boride layer thickness while minimizing energy consumption.Öğe Integrated environmental risk assessment approach for transportation modes(Taylor & Francis Inc, 2020) Oturakci, Murat; Dagsuyu, CansuThe main aim of this study is to develop and implement new integrated environmental risk assessment for transportation activities. With this purpose, environmental risks occur from transportation activities from different transportation modes which are air, road, sea and rail are determined. Transportation modes are compared with the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) approach in order to obtain importance weights and impact categories of air, soil and water are used as criteria where the weights are determined with Analytical Hierarchy Process (AHP). For the risk assessment process, Failure Mode and Effect Analysis (FMEA) has been used and prioritizations of risks are calculated with weights of the calculated transportation modes. In the study, integrated multi-criteria decision-making methods with the classic FMEA method with different categories of impacts reveal new multidimensional perspective to classic environmental risk assessment methods.Öğe Integrated process capability and multi-criteria decision-making approach(Springer, 2021) Dagsuyu, Cansu; Polat, Ulviye; Kokangul, AliThe surface protection processes are performed for metals in order to improve paint adhesion and dye yield, increase corrosion strength, and eliminate the necessity of re-processing. The desired quality to be received in the parts processed in the surface protection processes which constitutes multiple sub-processes can be obtained only if the sub-processes are conducted effectively. In this study, the criteria being effective on surface protection processes have been identified, and an approach based on the Analytic Hierarchy Process (AHP) and the process capability (C-p) values have been developed in order to identify the significance level of these criteria on the surface quality. The approach developed has been applied to the immersion phosphating process of a large-scale company. First of all, the significant levels of sub-processes were identified through the AHP method based on the quality parameters followed by the company. Then the C-p values were calculated based on the measurement criteria in order to understand the competence of each sub-process. Important subprocesses affecting the final quality of the immersion phosphating process have been identified by means of the PPN (Process Priority Number) index developed by using the AHP results and C-p values.Öğe Integrated risk prioritization and action selection for cold chain(Springer Heidelberg, 2021) Dagsuyu, Cansu; Derse, Onur; Oturakci, MuratCold 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.Öğe Investigating the potential of using aquafaba in eggless gluten-free cake production by multicriteria decision-making approach(Springer, 2023) Yazici, Gamze Nil; Taspinar, Tansu; Binokay, Hulya; Dagsuyu, Cansu; Kokangul, Ali; Ozer, Mehmet SertacDue to human health problems and concerns (phenylketonuria, egg allergy, cholesterol, avian influenza, etc.), different dietary choices, economical and sustainability-related issues led consumers to use plant-based egg alternatives. Therefore, this study aimed to evaluate the potential of aquafaba, which was provided from four different pulses as kidney bean, chickpea, haricot bean, and black-eyed peas, as an egg replacer in gluten-free (GF) cake production. The highest values of height, volume, volume index, symmetry index, porosity, and cell uniformity were acquired in control cakes made with whole eggs, followed by eggless gluten-free (ESGF) cakes including aquafaba from chickpea (AQ-CP) and black-eyed peas (AQ-BEP). Although all sensorial attributes were lower in ESGF cakes compared to the control, the area where the largest number of panelists would be satisfied in the preference map was between 60 and 80% in all ESGF cakes except from kidney bean aquafaba (AQ-KB) based ones. According to the results of the hybrid multi-criteria decision-making methodology based on the Analytic Hierarchy Process (AHP) and the technique for order of preference by similarity to ideal solution (TOPSIS), the ESGF cakes containing AQ-CP and AQ-BEP were favorable when regarding criteria such as volume, baking loss, color, porosity, and taste, with or without cost.Öğe Process capability and risk assessment for air quality: an integrated approach(Taylor & Francis Inc, 2020) Dagsuyu, CansuAir pollution is caused by many reasons such as using low calorie and high sulfur content coal for heating, increasing number of vehicles which produce exhaust and having industrial activities that do not contain chimney filtration and treatment plant. Even though there are many matters that cause air pollution, particulate matter has an enormous affect on human health. Because of the harmful effects of PM, it should be controlled very carefully. In Turkey, PM10 measurements are performed and controlled. The aim of this study is to develop new approach for risk assessment that considers those measurements. In the study, severity scale is determined with the help of Fine-Kinney Risk Assessment method with the integration of PM10 values for each measurement value. Environmental affect and Environmental Quality Ratio (EOR) are calculated for measurement stations. In addition, EOR and process capability () are integrated in this article. Developed approach is implemented for the values of Ankara, which is considered as polluted city, and clean cities of Turkey according to 2017 data in Turkey and results are discussed.Öğe Risk Analysis Application to Hazardous Material Transportation Modes(Sage Publications Inc, 2022) Derse, Onur; Oturakci, Murat; Dagsuyu, CansuHazardous 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.
