Yazar "Dengiz, Berna" seçeneğine göre listele

Listeleniyor 1 - 6 / 6
  • [ X ]
    Öğe
    A Genetic Algorithm for the Redundancy Allocation Problem with Repairable Components
    (Springer Nature Switzerland Ag, 2022) Sahin, Merve Uzuner; Dengiz, Orhan; Dengiz, Berna
    The complexity of the structures of modern engineering systems in the communication and electronic fields, the demand for high reliable system evaluation methods has increased. While improving the system's reliability, the cost is also on the upswing. Redundancy allocation is important approach for designing telecommunication systems. The reliability is increased by increasing number of redundant components in a system. The Redundancy Allocation Problem (RAP) is the design of new systems with higher reliability using redundant components in parallel arrangement. This paper presents a genetic algorithm (GA) with discrete event simulation (DES) to solve RAP with repairable components. The promising proposed approach is illustrated and investigated by some RAP benchmark/test problems involving repairable systems.
  • [ X ]
    Öğe
    Charging Station Network: A Case Study in Bakırköy, Istanbul
    (Springer Science and Business Media Deutschland GmbH, 2024) Uzuner, Meltem; Dengiz, Orhan; Dengiz, Berna
    In recent years, particularly within the past five years, the sales of electric vehicles (EVs) in Turkey have shown a remarkable upswing, mirroring the global trend. This surge in EV adoption has spurred significant interest among researchers in the development of a charging infrastructure capable of accommodating this escalating demand. Against this backdrop, our study focuses on the creation of an Electric Vehicle Charging Station (EVCS) network for the Bakırköy district in the Istanbul province—a locale of paramount importance, serving as a cultural crossroads. To address this challenge, we have developed and successfully solved a multi-objective mixed-integer linear programming (MO-MILP) model. The outcomes derived from solving this problem are presented here for the consideration and utilization of the relevant municipal authorities. © The Author(s), under exclusive license to Springer Nature Switzerland AG 2024.
  • [ X ]
    Öğe
    Evaluation of the Analysis of Daylight Performance for Public Buildings Facade Design Improvement
    (COMPUTATIONAL RESEARCH PROGRESS IN APPLIED SCIENCE & ENGINEERING (CRPASE), 2023) Kiraz, Fatih; Şahin, Merve Uzuner; Dengiz, Berna
    Global climate change threatens the ecosystem and has long-term consequences for societies. Human activities, particularly the use of fossil fuels, contribute to global warming due to greenhouse gas emissions. According to reports from the Intergovernmental Panel on Climate Change in 2001, 2007, and 2013, human activities have been identified as the primary cause of global warming observed since the mid-20th century. Factors contributing to global warming and climate change include energy consumption for electricity and heating, the use of fossil fuels, and the emission of greenhouse gases. Daylighting is important in ensuring the space's energy efficiency, sustainability, and comfort conditions. By incorporating sustainable building envelope designs, achieving the recommended daylighting levels is possible. This article examines the role of facade design in providing sustainable Energy for lighting and its impact on carbon footprint. The case study of the Kayseri Metropolitan Municipality building and the analysis of daylight levels in its spaces serve as a guiding example for the renovation of public buildings. Thus, new methods can be determined to reduce daylight-related electricity consumption with appropriate and straightforward decisions in designing the facades of the working areas of public buildings in Turkey.
  • [ X ]
    Öğe
    Güvenilirlik ve Kullanılabilirliğe Dayalı Sürdürülebilir Sistem Tasarımı: Yeni Bir Yaklaşım
    (2021) Uzuner Şahin, Merve; Dengiz, Orhan; Dengiz, Berna
    Günümüz rekabet koşullarında üretim sistemlerinde sürdürülebilirliğin sağlanması amacıyla sistem güvenilirliğinin ve kullanılabilirliğinin arttırılması için farklı yöntem arayışları araştırmacıların üzerinde çalıştığı önemli bir konudur. Sistem performansının analizi ve iyileştirilmesinde kullanılan en önemli kriterlerden birinin sistem güvenilirliği olduğu bilinmektedir. Güvenilirlik değeri yüksek olması istenen bir kriter olup sistemde üretilen ürün miktarını doğrudan etkiler. Sistem güvenilirliğinin hesaplanması amacıyla literatürde yaygın olarak kullanılan yapı fonksiyonuna dayalı güvenilirlik hesabı problemin karmaşıklığını artırmaktadır. Bu nedenle, sistem güvenilirlik hesabının daha kolay ve daha kısa sürede yapılabilmesini sağlamak amacıyla alternatif yöntemlerin geliştirilmesi ihtiyacı doğmuştur. Bu amaçla literatürde önerilen yeni bir yöntem ‘yaşam imzası’ yöntemidir. Bir sistemin güvenilirliğinin arttırılması için sistem güvenilirliği üzerinde en yüksek etkiye sahip olan bileşenin belirlenmesi, güvenilirlik artışını sağlayan tasarımın elde edilmesinde önemli bilgi sağlamaktadır. ‘Göreli bileşen önem indeksi’ bu amaçla kullanılan bir belirleyicidir. Bu çalışmada, her iki yöntem birlikte kullanılarak sistem güvenilirliği ve dolayısıyla kullanılabilirliği arttırılmıştır. Böylece, önceden belirlenen dönemler için sistemin üretim miktarı istenilen düzeyde tutabilmektedir. Önerilen bu yaklaşım bir akü üretim hattında uygulanarak sonuçları değerlendirilmiştir.
  • [ X ]
    Öğe
    Optimization of the redundancy allocation problem: Genetic algorithm and Monte Carlo simulation with discrete events
    (Gazi Univ, Fac Engineering Architecture, 2024) Sahin, Merve Uzuner; Dengiz, Orhan; Dengiz, Berna
    The reliability optimization of a system with various problem-specific constraints is an important problem. The Redundancy Allocation Problem (RAP) is the design of new systems with higher reliability using redundant components in parallel arrangement. While improving the system's reliability, the cost is also on the upswing. It has been ensured that system designs with higher reliability at lower costs, where failure and repair are considered, can be obtained (Table A). The reliability of the system with nonrepairable components is lower than the reliability of the system with repairable components. Furthermore, the cost of the system with nonrepairable components is higher than the cost of the system with repairable components.Purpose:The aims of this study are modeling the dynamic behavior of a system considering increasing failure and repair rates, and finding the optimal repairable system design.Theory and Methods:This paper presents a Discrete Event Simulation (DES) model to estimate the system reliability considering increasing failure and repair rates, and a Genetic Algorithm (GA) to find the optimal repairable system design.Results:According to the results, system designs with higher reliability at lower costs, where failure and repair are considered, can be obtained. It has been found that systems with repairable components are more reliable and cheaper than systems with nonrepairable components. Conclusion:It is obtained that the optimal repairable system design with higher reliability at lower cost than the nonrepairable system design.
  • [ X ]
    Öğe
    WEEE estimation and determination of collection points: A case for the Municipality of Cankaya
    (Pamukkale Univ, 2018) Kececi, Baris; Dengiz, Orhan; Dengiz, Berna; Sumer, Emre; Kilic, Aybuke; Ceki, Ece; Inan, Bedia
    Electrical-electronic waste (WEEE) is generated from electric and electronic devices at the end of their lifecycles. When WEEEs are disposed, burned or disassembled for recycling, they are transformed into products containing hazardous substances and harm the environment and human health. Therefore WEEEs should be collected, transported and processed properly during their recycling operations by municipality authority in order to minimize their damage and maximize their economic benefit. In this paper, a study is carried out for the WEEE management of Cankaya Municipality by the cooperation of Environmental Conservation and Control Department of Cankaya. For this purpose first WEEE with a focus on television, refrigerator, washing machine, oven and vacuum cleaner are estimated based on the electronic device usage behavior of residents in Cankaya. Secondly, the WEEE collection points' location problem is solved considering set covering problem.