Bozkurt Meslek Yüksekokulu Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/11499/46012
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Article Citation - WoS: 1Citation - Scopus: 1Developing a Capacity Model for Roundabouts Using Sidra Calibrated Via Simulation-Based Optimization(MDPI, 2025-11-17) Erol, Duygu; Baskan, OzgurVarious intersection structures are utilized in city-wide traffic network infrastructure by local transportation authorities to handle the exponentially increasing traffic loads in developing countries. In this regard, numerous studies have considered the notable positive contribution of the modern roundabouts in intersection performance as a prominent method utilized widely in our contemporary world. Properly designed roundabouts are vital components of sustainable transportation planning, as they significantly influence traffic efficiency, safety, and environmental performance. Accurate estimation of roundabout capacity is essential to ensure that they can accommodate anticipated traffic volumes without causing congestion, thereby contributing to energy efficiency and reducing emissions. Moreover, sustainable roundabout design supports the development of safer and more inclusive transportation networks by improving accessibility for all road users, thus strengthening the overall sustainability of urban mobility. The SIDRA (version 8.0), a traffic simulation software, is frequently employed in performance analysis and determining the effects of possible outcomes of different scenarios of roundabouts in today's world. On the other hand, driver behaviors are found to play a significant role in software performance during the analysis process of roundabout capacity and performance. Therefore, in order to optimize the environmental factor (EF) representing driver behaviors in the SIDRA software, a Differential Evolution Algorithm-Based Bi-Level Calibration Model (DEBCAM) was introduced. Observation data collected from eight different modern-structured roundabouts through drones were run into the SIDRA simulation software; the average delays obtained were employed to estimate optimum EF values through DEBCAM. Observed average delay values were taken into consideration with respect to the delay values obtained as a result of the SIDRA calibration by using the GEH statistics. GEH values indicate the consistency of vehicle delay data obtained via the DEBCAM with observed data. Acquired results clearly suggest that the SIDRA software needs to be calibrated so that it can represent drivers' behaviors. After determination of the optimum values of the EF parameter for calibration of the SIDRA software, the regression analysis was conducted through the Partial Least Squares (PLS) method. As a result of the analysis, a capacity estimation model was developed, which displayed a significant conformity with the SIDRA capacity estimation results. Our findings suggested that the parameter requirement for the roundabout capacity estimation can be decreased by employing the appropriate EF value for the roundabout that needs to be analyzed.Article Citation - WoS: 4Citation - Scopus: 4Cost optimization of tall buildings having tube composite columns using social spider algorithm(Wiley, 2024-05-07) Paksoy, Ahmed; Aydogdu, Ibrahim; Akin, AlperThis study aims to develop an algorithmic approach to obtain optimum designs for tall buildings having composite columns and investigate the material cost advantages of these buildings over steel structures. The social spider optimization (SSO) algorithm, a new meta-heuristic optimization method that has shown promising results in optimizing frame structures, was used to obtain the optimum designs. Concrete-filled steel tube sections were chosen for composite columns. To define the optimization problem, we considered the material cost of the structure as the objective function, the size of columns (strength, deflection, drift, and geometric limitations) as the constraint functions, and ready steel sections as the design variables. We tested eight different frame structures of varying heights and irregularities to analyze how cost varied according to these parameters. Our results demonstrate that composite columns are a more cost-effective option than steel structures, even for buildings that are not considered high rises. We found that the difference in cost between the two types of structures increases with building height and irregularity. Additionally, our optimization algorithm was unable to find feasible designs for steel structures taller than 180 m using ready steel profiles.Article Psiko-sosyal ve örgütsel-yönetsel motivasyon faktörlerinin iş tatminine etkisi: havayolu sektöründe bir araştırma(2020) Altıntaş, MustafaBu çalışmanın amacı, psiko-sosyal ve örgütsel-yönetsel motivasyon faktörlerinin, havayollarında çalışan kabin memurlarının iş tatminlerine etkisinin araştırılmasıdır. Araştırmada kullanılan anket formu 3 kısımdan meydana gelmektedir. Ankette yer alan ilk kısımda çalışanların demografik özelliklerini belirlemek amacıyla 6 soru yer almıştır. İkinci bölümde 13 ifadeli psiko-sosyal motivasyon faktörleri ölçeği ile 8 ifadeli örgütselyönetsel motivasyon faktörleri ölçeği ve son bölümde iş tatminine etkisini ölçmesi için 20 ifadeli Minnesota iş tatmini ölçeği kullanılmıştır. İlk aşamada elde edilen verilerin frekans dağılımları, normal dağılımdan gelip gelmediği, geçerlilik güvenirlik ve faktör analizleri yapılmıştır. İkinci aşamada ise ilişki ve etkinin belirlenmesi amacıyla bağımsız örneklemler t testi, anova testi ile korelasyon ve regresyon testleri yapılmıştır. Analizler sonucunda sosyal ve örgütsel-yönetsel motivasyon faktörlerinin iş tatminini pozitif yönlü fakat düşük kuvvette etkilediği tespit edilmiştir. Bu sonuç daha önceki çalışmaları doğrular nitelikte olup, en güçlü motivasyon faktörlerinin aslında ekonomik araçlar olduğunu, psiko-sosyal ve örgütsel-yönetsel motivasyon araçların ise daha az etkili olduğunu göstermiştir.