Yazar "Kokangul, Ali" seçeneğine göre listele

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    A new approach for environmental risk assessment
    (Taylor & Francis Inc, 2018) Kokangul, Ali; Polat, Ulviye; Dagsuyu, Cansu
    Environmental 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.
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    Catheter planning with goal programming method in neonatal intensive care unit
    (Wiley, 2022) Kokangul, Ali; Dagsuyu, Cansu
    Successful 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.
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    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, Necdet
    In 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.
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    Determining the significance weights of ALSFRS-R items using analytic hierarchy process
    (Wolters Kluwer Medknow Publications, 2023) Koc, Gizem; Eranay, Fatih; Kokangul, Ali; Koc, Filiz
    Objective: The objective of the study was to determine the significance weights of the Revised Amyotrophic Lateral Sclerosis Functional Rating Scale (ALSFRS-R) item scores for better evaluation and classification of amyotrophic lateral sclerosis (ALS) status. Methods: We used an analytical hierarchy process (AHP) to determine the weights of the ALSFRS-R item scores based on the opinions of two neurologists. We analyzed data of 51 patients with ALS to group them into four ALS severity classes based on their (i) total ALSFRS-R score and (ii) total weighted ALSFRS-R scores using the proposed weight values. We analyzed the performance differences between the two classification approaches based on the outcomes of these 51 patients. We also used twenty additional patients' data to analyze the accuracies of the total and weighted ALSFRS-R score approaches compared with physicians' actual assessments. Results: The AHP analysis assigned the highest weights to the ALSFRS-R items for respiratory insufficiency, orthopnea, and bed rotation/covering. ALS status classification based on the total and weighted ALSFRS-R scores differed for about 27.5% (confidence interval [CI]: 15.2%-39.8%) of the 51 patients. The classification based on the total weighted ALSFRS-R complied with the actual assessments in 85% (CI: 69.4%-100%) of the patients in the comparison sample; the compliance rate was 60% (CI: 38.5%-81.5%) for the total ALSFRS-R-based classification. Conclusions: Assigning weights to the 12 ALSFRS-R criteria/questions may improve ALSFRS-R's ability to represent ALS severity. This finding requires further investigation. © 2023 AVES. All rights reserved.
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    Integrated process capability and multi-criteria decision-making approach
    (Springer, 2021) Dagsuyu, Cansu; Polat, Ulviye; Kokangul, Ali
    The 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.
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    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 Sertac
    Due 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.