Sürdürülebilir Kalkınma Amaçları
Yayınlar
- MakaleYalnız künye2022Kişi Başı Enerji Tüketimi ve Ekonomik Büyüme Arasındaki İlişkinin İncelenmesi: ANN Yöntemiyle Gelecek Perspektifi
Okur, Fatih; Yılmaz, Hamid
Bu çalışmada Türkiye için 2000-2019 dönemi için ekonomik büyüme, kişi başına enerji tüketimi, kişi başına doğrudan yabancı yatırım ve kişi başına ticaret hacmi arasındaki ilişki Granger nedensellik yöntemi kullanılarak incelenmiştir. Birinci dönem (2000-2019) nedensellik bulgularına göre, ekonomik büyümeden kişi başına doğrudan yabancı yatırıma ve kişi başına doğrudan yabancı yatırımdan kişi başına enerji tüketimine doğru tek yönlü bir nedensellik vardır. İkinci dönemin (2000-2025) nedensellik sonuçları, ekonomik büyümeden kişi başına doğrudan yabancı yatırımlara, kişi başına doğrudan yabancı yatırımlardan kişi başına enerji tüketimine doğru tek yönlü bir ilişki ortaya koymaktadır. Aynı zamanda hem ekonomik büyüme hem de kişi başına düşen enerji tüketiminden kişi başına ticaret hacmine doğru tek yönlü bir ilişki bulunmuştur.
AtıfTR Dizin1
İncele - MakaleAçık Erişim2022Assembly Line Worker Assignment and Balancing Problem by Considering Labor Cost
Yılmaz, Hamid
Assignment of worker appears as a new problem in the literature for assembly lines (AL) where the workforce is heterogeneously located. The difference of this line balancing from the traditional line is that the assembly task times of the workers to be assigned to the stations differ from each other. Especially assembly lines issues are generally a labor-intensive type of production. Therefore, for assembly line problems, balancing activity should be done considering the labor costs. Thus, the proposed solutions will be able to produce more realistic results for real life. For this purpose, in this study, a mixed-integer mathematical formulation is presented for assembly line worker assignment and balancing problems by considering the objective function of minimizing labor costs and cycle time. The efficiency of the proposed model and the improvements have been demonstrated by solving test instances in the literature.
AtıfTR Dizin1İncele - MakaleAçık Erişim2020Scopus SJRQ2A visual application for teaching pipe flow optimization in engineering curricula
Türkkan, Yusuf Alptekin; Eryılmaz Türkkan, Gökçen; Yılmaz, Hamid
The main purpose of this study is to investigate the importance of programming in the learning and understanding of water distribution networks. This paper presents the implementation of a programming language C# for applications for teaching water distribution networks calculations at both undergraduate and graduate levels. A user's guide is also prepared for the software which includes the theory of hydraulic and optimization calculations. There are many ways to design water distribution networks. Hardy Cross method is very often used for optimization of networks. Thus, Hardy Cross optimization method was preferred in this study. It is a perfect study to implement as an educational tool at undergraduate and graduate levels of education.
AtıfScopus12WoS10OpenAlex12
İncele - MakaleAçık Erişim2019A New Mathematical Model for Assembly Line Worker Assignment and Balancing
Yılmaz, Hamid; Demir, Yunus
Aim of assembly line balancing is to assign the product parts to the workstations that constitute the assembly line. Worker assignment problem is a new problem variety in assembly lines that typically is met in different situations in which the workforce is not homogeneous. This problem is different from the well-known simple assembly line balancing problem from the view point of task execution times of nonhomogeneous workers. In this paper, we introduce a new mathematical formulation with objective function to minimize the cycle time for the assembly line worker assignment and balancing problem (ALWABP). GUROBI solver is used for the problem solution. The mathematical model is examined by using a standard test problem set. As a result of the experiments, it is observed that the proposed mathematical model is more effective in terms of solution quality and CPU time than the current mathematical method.
AtıfOpenAlex5TR Dizin3İncele - MakaleAçık Erişim2019A Problem-Solving Environment to Teach Students Assembly Line Balancing Techniques
Yılmaz, Hamid; Demir, Yunus
Assembly line balancing is a production planning strategy that has been widely used in industrial applications.Most line balancing problems are known as nondeterministic polynomial time (NP-hard) problem, and theyhave different structures and solution methodology approaches. In this study, newly developed productionplanning software which is called Visual Assembly Line Balancing Software (VALBS) is introduced foreducational purposes. The aim of the software is to support teaching activity for assembly line balancingtechniques; facilitate understanding characteristics of different assembly lines and solution approaches, andenable to compare the results of them. The proposed VALBS is easy to use in various manufacturingenvironments, and suitable to support teaching line balancing procedures in undergraduate students. Thesoftware was used in classes of industrial and mechanical engineering students and feedbacks of studentsmeasured by Likert Scale survey. The results show that proposed visual software is an effective method to teachline balancing procedures.
- MakaleAçık Erişim2017Scopus SJRQ2Chinese postman problem approach for a large-scale conventional rail network in Turkey; [Primjena pristupa "problem kineskog poštara" na široku mrežu Turske željeznice]
Yılmaz, Mustafa; Çodur, Merve Kayacı; Yılmaz, Hamid
Every year, railways are inspected periodically to examine the status of rail tracks and ensure the safety of train operations of the railroad networks in Turkey. These inspection projects must be performed by several specialized machines with large and expensive equipment. Finding the optimum route of inspection machines that control through travelling all lines is critically important in terms of cost and distance. In current practice, determining the route of these machines is largerly manual and primarily relies on the knowledge and judgment of experts. This paper proposes Chinese Postman Problem (CPP) to solve the inspection machine routing problem. The objective is to minimize the total travel distance on the railroads by finding the shortest route. The proposed model is applied to a large-scale real world problem. Compared to the current practice the proposed approach significantly outperforms the reduced objective value by 20, 76%.
AtıfScopus6WoS5OpenAlex10İncele