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Öğe A Hybrid Model to Optimize the Maintenance Policies in the Hydroelectric Power Plants(Gazi Univ, 2021) Ozcan, Evrencan; Gur, Seyda; Eren, TamerThe main goal of power plants is to generate the electricity in sustainability perspective consisting of the principles of environmental awareness, reliability, efficiency, economy and uninterruptedness. Complying with the operational directives and maintenance are twin pillars for achieving this comprehensive goal. Within this scope, this study handles the maintenance strategy selection problem which is the first step of the effective maintenance management for one of the most important equipment groups among thousands of equipment in one of the large-scale hydroelectric power plants which have great importance for Turkey energy mix with approximately a fifth share in the total generation. So as to determine the most critical equipment group AHP-TOPSIS combination is used. For the selected equipment group, the most appropriate of all applicable 4 maintenance strategies are determined via PROMETHEE, which has been limited used for the maintenance strategy selection problem in the literature despite its advantages. As a result of this study which is the first in the literature with its method configuration and its application in hydroelectric power plants, a 1-year observation is conducted to confirm the proposed approach, and a 100% improvement is achieved in the unit shutdowns resulting from the selected equipment.Öğe An Evaluation of the Market Strategies and Decisions of the Contracted Broiler Enterprises in Bolu, Sakarya and Ankara via Analytical Hierarchy Process(Gorgan Univ Agricultural Sciences & Natural Resources, 2021) Tuncel, Seyfettin; Eren, Tamer; Gur, Seyda; Sen, Gokhan; Sipahi, CevatThis study was performed to evaluate the decisions of the contracted broiler enterprises for the integrated company selection in terms of 5 criteria (C1: Stability, C2: Crisis management, C3: Profitability C4: Flexibility, C5: Supply). In this study, 68 enterprises were selected with stratified random sampling among the broiler enterprises, operating in Sakarya (12.0%), Bolu (11.0%) and Ankara (3.2%) those constitute 24.2% of contracted broiler enterprises in Turkey in 2017. The research was conducted with two large scales (A and B) and two small scales (C and D) integrated companies in the broiler sector, where broiler enterprises produce under a contract. According to these 5 criteria, the optimum selection of integrated companies of broiler enterprises among A, B, C, and D was analyzed using Analytical Hierarchy Process (AHP). As a result of the analysis, the importance level of C1, C2, C3, C4, and C5 criteria among 5 criteria was found strategically significant at 46.0%, 20.0%, 18.0%, 10.0% and 6.0%, respectively. Thus, Cl criterion was determined as the most dominant criterion. The selection weights of integrated companies A, B, C, and D were 34.5%, 36.7%, 12.6% and 17.1%, respectively. This result shows that working with large-scale A and B integrated companies is strategically advantageous for broiler enterprises.Öğe Analysis of criteria acting on coronavirus(Yildiz Technical Univ, 2023) Sonel, Edanur; Gur, Seyda; Eren, TamerViruses are obligate intracellular parasites that can infect animals, plants, bacteria and many more microorganisms. Viruses are spread by aphids and insects in plants, and by bloodsuck-ing insects in animals. In humans, they can cause flu by spreading through respiratory, hu-man-to-human contact, water and food. Some viruses, however rare, infect humans from an-imals. Coronavirus is one of the viruses transmitted from animals to humans. The new type of coronavirus (Covid-19), which is on the world agenda, is similar to seasonal flu, previously unidentified and contagious virus in humans. In this study, new types of coronavirus and its effects were investigated and studies related to coronavirus conducted worldwide were ana-lyzed. As the treatment process in the world continues, every country has started to take its measures. The measures taken by countries, especially Turkey, have been identified. It is aimed to calculate the importance and priority values of the measures with the Analytic Network Process and Fuzzy Analytic Hierarchy Process methods, which is one of the multi-criteria decision-making methods. As a result of the values obtained, it is planned to prioritize the measures taken while struggling coronavirus and contribute to the struggle against coronavi-rus by giving emphasis to the priority measures.Öğe Analysis of factors affecting industrial symbiosis collaboration(Springer Heidelberg, 2022) Sonel, Edanur; Gur, Seyda; Eren, TamerThe rapidly increasing population causes an increase in consumption amounts day by day. This leads to negative effects such as the reduction of limited resources. In order to eliminate or reduce such negative effects, sustainable approaches are adopted for the future. Industrial symbiosis is one of these sustainable approaches. Industrial symbiosis is when two or more economic enterprises operating independently of each other form beneficial partnerships. In this study, the factors affecting industrial symbiosis collaboration were determined by literature review and by analyzing these factors; it is aimed to eliminate inefficiencies and to ensure the sustainability of established relations. The criteria determined are weighted with the Analytical Network Process method, which is one of the multi-criteria decision-making methods, and it is aimed to calculate the degree of importance and priority.Öğe Analysis of the Difficulties of SMEs in Industry 4.0 Applications by Analytical Hierarchy Process and Analytical Network Process(Mdpi, 2018) Sevinc, Ali; Gur, Seyda; Eren, TamerThe concept of Industry 4.0 is seen as a recent paradigm in the manufacturing sector. The use of new production and management technologies required by the concept of Industry 4.0 is very important for small enterprises in order to keep up with the competition. However, most enterprises look at these requirements in a negative way. This study analyzes the propulsion forces of Industry 4.0 adopted in small and medium enterprises. By analyzing the difficulties in the transition process of small and medium-sized enterprises (SMEs) to Industry 4.0, the company contributes to the determination of strategic steps taking these results into consideration. This will facilitate the transition of enterprises to Industry 4.0 and progress can be made towards efficient use of resources. A hierarchical structure was established under the four main criteria of innovation, organization, environmental, and financial aspects, and the relative weight of these criteria and sub-criteria were calculated. The surveys conducted on business managers were evaluated using multi-criteria decision-making methods by the analytic hierarchy process method and the analytic network process. At the same time, the interaction between these criteria was taken into consideration and the criteria were re-evaluated by the analytical network process method. The results of the two methods seem to support each other.Öğe Application of Operational Research Techniques in Operating Room Scheduling Problems: Literature Overview(Hindawi Ltd, 2018) Gur, Seyda; Eren, TamerIncreased healthcare costs are pushing hospitals to reduce costs and increase the quality of care. Operating rooms are the most important source of income and expense for hospitals. Therefore, the hospital management focuses on the effectiveness of schedules and plans. This study includes analyses of recent research on operating room scheduling and planning. Most studies in the literature, from 2000 to the present day, were evaluated according to patient characteristics, performance measures, solution techniques used in the research, the uncertainty of the problem, applicability of the research, and the planning strategy to be dealt within the solution. One hundred seventy studies were examined in detail, after scanning the Emerald, Science Direct, JSTOR, Springer, Taylor and Francis, and Google Scholar databases. To facilitate the identification of these studies, they are grouped according to the different criteria of concern and then, a detailed overview is presented.Öğe Determination of Effective Criteria for Mobile Application Selection and Sample Application(Istanbul Univ, 2020) Uslu, Buse; Gur, Seyda; Eren, Tamer; Ozcan, EvrencanToday everyone has specially coded and designed software for mobile phones or tablets. The 2017 data from Turkish Statistical Institute (TURKSTAT) show that there are about 78 million mobile phone users and of these the number of internet subscribers selection according to the literature review and expert opinions are language, price, performance, memory usage, user interpretation and speed. The criteria were evaluated by five officials and compared with AHP (Analytical Hierarchy Process) method to determine the significance of the criteria. Thereafter, five mobile application projects were determined and the alternatives were made by applying AHP, TOPSIS and PROMETHEE methods.Öğe Evaluation of the Difficulties in the Internet of Things (IoT) with Multi-Criteria Decision-Making(Mdpi, 2019) Uslu, Buse; Eren, Tamer; Gur, Seyda; Ozcan, EvrencanThe rapid development of technology has increased the desire of all to be on the Internet. The discovery that objects born of the Internet communicate with each other without external factors revealed, with the fourth industrial revolution, the concept of the Internet of Things (IoT). The communication of objects with each other means minimum labor and minimum cost for enterprises. Enterprises that want to transition to the Internet of Things face many difficulties. Identifying and correcting these difficulties can lead to both lost time and high cost. In this study, we investigated the difficulties encountered in the Internet of Things. As a result of the study, the degree of importance of the factors causing these difficulties was determined by multi-criteria decision-making methods and was presented to the enterprises. The main criteria, and the sub-criteria related to these main criteria, were determined. The main purpose of the enterprises transitioning to Industry 4.0 is the communication of things with each other. In this study, we aimed to determine which criteria caused difficulties in the transition to Industry 4.0. Then, the degree of importance of the criteria was determined using the analytic hierarchy process (AHP) and analytic network process (ANP) methods, in the multi-criteria decision-making. Through the study, we determined which criteria should be taken into consideration by the enterprises that want to transition to the Internet of Things. In this way, enterprises will be able to accelerate that transition by minimizing time and monetary loss.Öğe Goal Programming Approach For The Radiology Technician Scheduling Problem(Yildiz Technical Univ, 2019) Ozcan, Evrencan; Danisan, Tugba; Yumusak, Rabia; Gur, Seyda; Eren, TamerPopulation growth is led to an increase in demand in the health sector. Health services need to be met at the maximum level in the face of increasing demand. The number of patients per each health personnel in Turkey is too much. Considering this situation, it is seen that ensuring patient satisfaction is directly proportional to the satisfaction of the personnel. For this reason, some studies such as the positioning of polyclinics and hospitals encountered in health services, capacity planning and demand estimations, as well as the studies about the creation of study schedules of health personnel are also gained importance. In this study, it is aimed to provide the personnel satisfaction as much as possible. The Law No. 3153 on Radiology, Radionomy and Electrical Therapy and Other Physiotherapy Institutions published by the Ministry of Health of the Republic of Turkey, dated 19/4/1937, as well as the requirements of the Annex-1 of 21/1/2010, is considered. The scheduling problem for eight radiology technicians working in a private hospital in Ankara is discussed. A mathematical model is proposed using the goal programming method in order to assign the technicians to the four shifts as equally as possible. According to the researches, this is the first study which has the feature of radiology technicians and by considering government and hospital conditions as well as with staff requests, by application area.Öğe Operating room scheduling with surgical team: a new approach with constraint programming and goal programming(Springer, 2023) Gur, Seyda; Pinarbasi, Mehmet; Alakas, Haci Mehmet; Eren, TamerIn recent years, there has been a significant increase in health expenditures due to population growth. In this context, hospital administrators have started to look for ways to use existing resources effectively. Operating rooms are one of the most important units of a hospital. The efficient use of these units is seen as a decrease in cost items and an increase in revenues. At this point, it is aimed to use the operating rooms effectively in this study. The fact that it contains many uncertainties and many stakeholders in its structure complicates the solution process of the operating room scheduling problem. In this study, planning was made that considered the uncertainty in the operation times and the surgeons, nurses, and anesthesiologists in the surgical team. To solve the problem, the logical modeling power of the constraint programming method and the power of the goal programming method to stretch rigid constraints were utilized. In the first stage, the balanced assignment of the surgical team (surgeon-nurse-anesthesiologist) was carried out, while in the second stage, operations were assigned to the operating rooms. The proposed model was evaluated according to the operating rooms' utilization rates and the solution's effectiveness. The results showed that the proposed model successfully created an effective and efficient schedule.Öğe Ranking Of Sustainability Criteria For Industrial Symbiosis Applications Based On Anp(VILNIUS GEDIMINAS TECH UNIV, 2020) Alakas, Haci Mehmet; Gur, Seyda; Ozcan, Evrencan; Eren, TamerEnterprises have started to establish partnerships both to use their internal resources efficiently and to increase their environmental performance. Partnerships and interoperability of enterprises with different processes enable them to benefit more from their benefits. Moving towards the local and regional economy, these partnerships that increase environmental and own resources have created industrial symbiosis practices. Industrial ecology fields are established in these applications. Both environmental and economic gains can be achieved through the efficient use of resources by enterprises and the minimization of wastes. For the sustainability of these partnerships to be established by enterprises, they need to analyze the measures they take internally. In this study, the concept of industrial symbiosis and the criteria that are effective for the sustainability of these industrial symbiosis are evaluated. Analytical network process method is used. Thus, the industrial symbiosis infrastructures to be established by enterprises have been enabled to move strategically.Öğe Scheduling and Planning in Service Systems with Goal Programming: Literature Review(Mdpi, 2018) Gur, Seyda; Eren, TamerBackground: People want to be able to evaluate different kinds of information in a good way. There are various methods that they develop in such situations. Among the optimization methods, the goal programming method is often used when there are multiple objectives that decision makers want to accomplish. Because scheduling and planning problems have multiple objectives that are desired to be achieved, the goal programming method helps the researcher in contradictory situations between these goals. Methods: This study includes, examines, and analyzes recent research on service scheduling and planning. In the literature, service scheduling and planning studies have been examined using goal programming method from past to today. Results: The studies are detailed according to the type of goal programming, according to scheduling types, the purpose used in the studies, and the methods integrated with the goal programming. There are 142 studies in Emerald, Science Direct, Jstor, Springer, Taylor and Francis, Google Scholar, etc. databases that are examined in detail. For readers, diversification has been made to facilitate the identification of these studies and a detailed overview has been presented. Conclusion: As a result of the study, studies with the goal programming in the literature have been seen. The readers' perspectives for planning and scheduling are discussed.Öğe Selecting of Monorail projects with analytic hierarchy process and 0-1 goal programming methods in Ankara(Pamukkale Univ, 2017) Gur, Seyda; Hamurcu, Mustafa; Eren, TamerUncontrolled increasing population, unplanned urbanization and enhancement in private vehicles number have revealed the of congestion traffic problem in urban area. These conditions have led to increase the need to remodeling the transportation plans. For this reason, a huge number of intensive studies were carried out in order to insure more efficiency to the public transport system by their different modes. One of these studies concerns the monorail service in Ankara, one of the most safe, fast and comfortable transport modes. Indeed, we made selection from several transport projects in Ankara Metropolitan Municipality using Analytic Hierarchy Process (AHP) and 0-1 Goal Programming methods.Öğe Surgical Operation Scheduling with Goal Programming and Constraint Programming: A Case Study(Mdpi, 2019) Gur, Seyda; Eren, Tamer; Alakas, Haci MehmetThe achievement of health organizations' goals is critically important for profitability. For this purpose, their resources, materials, and equipment should be efficiently used in the services they provide. A hospital has sensitive and expensive equipment, and the use of its equipment and resources needs to be balanced. The utilization of these resources should be considered in its operating rooms, as it shares both expense expenditure and revenue generation. This study's primary aim is the effective and balanced use of equipment and resources in hospital operating rooms. In this context, datasets from a state hospital were used via the goal programming and constraint programming methods. According to the wishes of hospital managers, three scenarios were separately modeled in both methods. According to the obtained results, schedules were compared and analyzed according to the current situation. The hospital-planning approach was positively affected, and goals such as minimization cost, staff and patient satisfaction, prevention over time, and less use were achieved.
