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Öğe A new approach for environmental risk assessment(Taylor & Francis Inc, 2018) Kokangül, 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 Review of Applications of Linear Programming and Mixed Integer Linear Programming in Energy Management: From Policy Makers/Producers to Consumers(Namık Kemal Üniversitesi, 2018) Polat, Ulviye; Gürtuna, FilizOptimization methods in the field of energy efficiency and energy management is a popular research area. Applications of linear programming, mixed integer linear programming are important since they provide an efficiently-solvable model for these complex problems. This study focuses on those applications from the perspectives of policy makers/producers and consumers. Some of those applications are related to smart power distribution, renewables, energy efficient buildings, energy planning etc. As the demand for energy, new alternative energy sources and new technological developments will keep growing, use of optimization methods in general and linear programming in particular will find many different application areas.Öğe Classifying environmental significance levels of production-oriented operational activities with F-ARAS and F-MOORA methods(Wiley, 2022) Polat, UlviyeIn most decision analysis approaches, application results are obtained in the form of a ranking or selection set. However, classification is needed for analysis of results. In this study, environmental significance levels and range values were created for the ranking results obtained using fuzzy Multi Criteria Decision Making approaches. Environmental significance levels have been established for 26 operational activities for which environmental impacts have been determined. Operational activities were analyzed using the Fuzzy-Additive Ratio Assessment (F-ARAS), Fuzzy-Multi Objective Optimization by Ratio Analysis (F-MOORA) Ratio, and F-MOORA Reference Point methods with six evaluation criteria, including the total impact score criteria. The results obtained were analyzed with environmental significance levels and range values, which can also be named as environmental risk classes created for the first time in this study depending on the changes in standard deviation. According to the comparison results, when F-ARAS and F-MOORA Ratio methods were evaluated together, 19 activities were in the same class (73%). Integr Environ Assess Manag 2022;00:1-12. (c) 2022 SETACÖğe Comparison of ANN and RSM modeling approaches for WEDM process optimization(Walter De Gruyter Gmbh, 2021) Sağbaş, Aysun; Gürtuna, Filiz; Polat, UlviyeIn this paper, an effective process optimization approach based on artificial neural networks with a back propagation algorithm and response surface methodology including central composite design is presented for the modeling and prediction of surface roughness in the wire electrical discharge machining process. In the development of predictive models, cutting parameters of pulse duration, open circuit voltage, wire speed and dielectric flushing are considered as model variables. After experiments are carried out, the analysis of variance is implemented to identify the contribution of uncontrollable process parameters effecting surface roughness. Then, a comparative analysis of the proposed approaches is carried out to determine the most efficient one. The performance of the developed artificial neural networks and response surface methodology predictive models is tested for prediction accuracy in terms of the coefficient of determination and root mean square error metrics. The results indicate that an artificial neural networks model provides more accurate prediction than the response surface methodology model.Öğe Integrated process capability and multi-criteria decision-making approach(Springer, 2021) Dagsuyu, Cansu; Polat, Ulviye; Kokangül, 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 Prioritizing a New Set of Environmental Management System Activities with Fuzzy Topsis Method(2020) Polat, Ulviye; Gürtuna, FilizEnvironmental Management System (EMS) studies conducted today are activities whereenterprises plan, implement, control and monitor measures related to their activities that can impact theenvironment, and systematically and sustainably carry out activities aimed at preserving the environment.Given the limited resources of enterprises such as workforce, money, time, machinery and equipment, it isimportant for enterprises to prioritize their activities so that EMS’s work effectively. In this study, a list ofenvironmental activities was primarily established with the aim of determining the EMS activities to beundertaken by enterprises or evaluating existing environmental activities. An approach for determiningprioritized activities was developed from the created activity list according to the evaluation criteriaappropriate to the operating conditions of enterprises.Öğe SÜRDÜRÜLEBİLİR ULAŞIM PLANLAMASI İÇİN ŞEHİR İÇİ OTOBÜS HATLARINDA SEFER ÇİZELGELEME OPTİMİZASYONU(2022) Polat, Ulviye; Sağbaş, Aysun; Dermenci, Melike SelenÜlkemizde ve dünyada nüfusun sürekli artması ile birlikte, toplu taşıma ve ulaşım sistemlerinin planlanması ve bu süreçte yaşanan sorunların çözümü; çevresel duyarlılık, ekonomik ve toplumsal fayda açısından çok büyük önem arz etmektedir. Şehir içi toplu taşıma sistemlerinde sefer sıklıklarının ve sayılarının optimum seviyesinin belirlenmesi; maliyet, çevresel etki ve toplumsal refah ekseninde toplu taşımanın en önemli sorunlarından olup, şehirde yaşayan tüm bireyler için kritik bir konudur. Bu çalışmada; şehir içi toplu taşıma (otobüs) sistemlerinin verimli ve sürdürülebilir olarak planlanması amacıyla; Tekirdağ/Çorlu Belediyesi toplu taşıma ulaşım sistemlerinin günlük sefer sayılarının, sefer sıklıklarının ve yolcu taşıma kapasitelerinin mevcut durumu incelenerek sefer sayısı optimizasyonu yapılmıştır. Bu amaçla ulaşım yönetim sistemi verileri kullanılmış ve günlük sefer sayısı optimizasyonu için doğrusal hedef programlama modeli geliştirilmiştir. Model, LINGO paket programı yardımıyla çözülerek, gün bazında optimum sefer sayısı belirlenmiştir. Çalışmada seçilen pilot otobüs hattı için detaylı analizler gerçekleştirilmiştir. Mevcut durum sistem tasarımı ve optimum sistem tasarımı sonuçları karşılaştırmalı olarak değerlendirilmiş olup fayda maliyet analizi yapılmıştır.Öğe Urban Public Transportation Systems Modeling With Linear Goal Programming Approach(Tekirdağ Namık Kemal Üniversitesi, 2022) Sağbaş, Aysun; Polat, UlviyeWith the rapid population growth in recent years, due to the increase in the number of city buses used in public transportation; environmental pollution, noise, passenger dissatisfaction, cost, etc. such problems are also increasing. In this context; it is of great importance to plan factors such as the route of the buses, the number and frequency of bus trips, passenger carrying capacity, and waiting times. Efficient and rational planning and sustainability of public transport and transportation systems, optimum use of the existing capacity are critical issues for decision makers, due to the high economic costs of investments in public transport and transportation systems. Therefore, in terms of environmental, economic and social welfare aspects, it is seen as an absolute necessity for urban public transportation systems to be optimally planned, efficient and sustainable. In this study; by applying a linear goal programming approach, a new system design based on meeting passenger demands was developed and city bus schedule optimization was performed. For the bus transportation system; number of voyages, voyage frequency, passenger capacity, etc. The current situation has been analyzed in terms of such parameters, and an optimization model has been created to meet the daily passenger demand. After all; the optimum number of voyages and voyage frequency model results were evaluated and the size of the financial gains obtained was examined.Öğe Yenilenebilir Enerji Alternatiflerinin Değerlendirilmesinde Copras ve Interval Type-2 Fuzzy Topsis ile Hibrit Yaklaşıma Dayalı Bir Karar Destek Sistemi(Tekirdağ Namık Kemal Üniversitesi, 2023) Sağbaş, Aysun; Deveci, Muhammet; Polat, UlviyeYenilenebilir enerji (YE), toplumun ve ekonominin sürdürülebilir gelişimi için hayati bir kaynaktır. Hem gelişmiş hem de gelişmekte olan ülkelerin enerji ihtiyacının karşılanmasında önemli rol oynamaktadır. Ayrıca yenilenebilir enerji, çevrenin iyileştirilmesi, yakıt çeşitliliğinin artması, enerji fiyatlarının düşmesi, ekonomilerde değişiklik etkisi, ulusal ekonomik güvenlik ve ekonomik verimliliğin artması gibi birçok fayda yaratmaktadır. Herhangi bir ülke için en uygun yenilenebilir enerji alternatiflerinin seçimi, bölgesel, ulusal ve küresel enerji sistemleri planlamacılarına yol gösterici olabilir. Yenilenebilir enerji kaynaklarının sıralanması konusu, birbiriyle çelişen birçok kriteri içermekte olup; teknik, ekonomik, maliyet, sosyo-politik ve çevresel kriterlerin eş zamanlı olarak bir araya getirilmesi bakımından karmaşık bir sorundur. Bu çalışmada, ulusal yenilenebilir enerji yatırımlarının doğrudan planlanmasında YE alternatiflerini önceliklendirmek amacıyla Aralıklı Tip-2 Bulanık TOPSIS Tekniği ve COPRAS yönteminden oluşan entegre çok kriterli karar verme (MCDM) yaklaşımı kullanılmıştır. Önerilen metodolojinin uygulanabilirliğini göstermek amacıyla uzman değerlendirmeleri yoluyla Türkiye için gerçek bir vaka uygulaması sunulmuştur.
