Person: ARSLAN, TURAN
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ARSLAN
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TURAN
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Publication Estimation of delay and vehicle stops at signalized intersections using artificial neural network(Univ Rijeka, Fac Engineering, 2016-01-01) Doğan, Erdem; Akgüngör, Ali Payidar; Arslan, Turan; ARSLAN, TURAN; Mühendislik Fakültesi; İnşaat Mühendisliği Bölümü; AAL-9217-2020Delay and number of vehicle stops are important indicators that define the level of service of a signalized intersection. Therefore, they are usually considered for optimizing the traffic signal timing. In this study, ANNs are employed to model delay and the number of stops estimation at signalized intersections. Intersection approach volumes, cycle length and left turn lane existence were utilized as input variables since they could easily be obtained from field surveys. On the other hand, the average delay and the number of stops per vehicle were used as the output variables for the ANNs models. Four-leg intersections were examined in this study. Approach volumes including turning volumes are randomly generated for each lane of these intersections, then the traffic simulation program was run 196 times with each generated data. Finally, average delay and the number of stops per vehicle were obtained from the simulations as outputs. In this study, various network architectures were analyzed to get the best architecture that provides the best performance. The results show that the ANNs model has potential to estimate delays and number of vehicle stops.Publication Traffic safety at median ditches: Steel vs. concrete barrier performance comparison using computer simulation(MDPI, 2018-12-01) Yücel, Ayhan Öner; Atahan, Ali Osman; Arslan, Turan; Sevim, Umur Korkut; ARSLAN, TURAN; İnşaat Mühendisliği Bölümü; 0000-0003-1313-3091; AAL-9217-2020In Turkey, concrete V-shaped ditches are formed at the median section of divided highways to provide drainage. Recent accidents show that these ditches actually present safety risks to vehicles entering the medians. Vehicles either cross over the ditch, roll over, or become trapped in the ditch, depending upon the mass, size, speed, and angle of the entering vehicle. To overcome this safety risk and reduce the severity of these accidents, longitudinal barriers are installed along these ditches. Currently, in Turkey, steel barriers are extensively used to improve traffic safety at median ditches. In this paper, the crash performances of steel and concrete barriers used at medians with ditches are compared. A model of a standard steel EDSP-1.33 barrier and a model of a newly developed concrete C470 barrier were constructed, and impact simulations were performed for when they are installed at a ditch slope break point. A nonlinear finite element program, LS-DYNA, was used for the analysis. A 13,000 kg bus model was used to impact both barriers in accordance with European standard requirements for crash tests. Simulation results show that when the steel EDSP-1.33 barrier is used, the bus has the potential for excessive penetration of the ditch, with significant barrier deformation. Moreover, the barrier damage is extensive, resulting in increased maintenance costs. On the other hand, the concrete C470 barrier successfully contains and redirects the 13,000 kg bus impact, with minimal barrier deformation and safety risk. Even though the concrete barrier slides toward the inside of the ditch, the bus does not enter the ditch area and exits the barrier in a stable manner. Therefore, to increase traffic safety at ditches located at the median section of divided highways in Turkey, utilization of the newly developed concrete barrier C470 is recommended.Publication Geri yayılımlı birlikte evrim ile iyileştirilmiş derin sinir ağları kullanılarak yol çatlak tespiti(Bursa Uludağ Üniversitesi, 2024-08-02) Anık, Emirhan Mustafa; Arslan, Turan; Anık, Emirhan Mustafa; ARSLAN, TURANKarayolu esnek üstyapılarındaki çatlaklar genellikle trafik yükleri ve hava koşullarından kaynaklanır. Bu çatlakların genişlemeden tespit edilip gerekli bakımlarının yapılması, yol konforunun sürekliliğini sağlamanın yanı sıra bakım maliyetlerini de azaltacaktır. Bu çalışma, yoldaki çatlakları gerçek zamanlı ve yüksek doğrulukla tespit etmeyi amaçlamaktadır. Bu bağlamda, Geri Yayımlı Birlikte Evrim yaklaşımıyla İyileştirilmiş Derin Sinir Ağları ve görüntü işleme yöntemleri birlikte kullanılmıştır. Ayrıca, çeşitli sayı ve çözünürlüklerde çatlaklı görsel veriler içeren EdmCrack600, AsphaltCrack, CFD ve CrackSegmentation veri setleri kullanılarak yeni bir veri seti oluşturulmuş ve bu veri seti üzerinde Derin Sinir Ağları tabanlı öğrenme gerçekleştirilmiştir. Modelin doğruluğu, CFD veri seti kullanılarak Kesinlik, Duyarlılık ve F1-Skoru ile değerlendirilmiştir. Değerlendirme sonucunda, önerilen yöntemin saniyede 48 görsel üzerinde çatlak tespit edebildiği ve %92,74 Kesinlik, %88,92 Duyarlılık ve %89,61 F1 Skoru başarı oranlarına ulaştığı gözlemlenmiştir.Publication Development of a precast slim temporary concrete safety barrier STCSB 50 for work zone applications(Taylor & Francis, 2019-01-01) Atahan, Ali Osman; Arslan, Turan; Ganster, Wolfgang; Edl, Thomas; ARSLAN, TURAN; Mühendislik Fakültesi; İnşaat Mühendisliği Bölümü; 0000-0003-1313-3091; AAL-9217-2020Selecting proper restraint systems for road-work zone areas is essential in ensuring the safety of motorists and construction workers as well as preventing occurrence of severe accidents. Regulations surrounding these choices vary greatly with some countries leaving the discretion to the managers whereas others mandate the use of barriers meeting specific requirements based on how they will be used. However, some nations have very detailed specifications including requirements for barriers to meet specified performances with respect to their application areas. Identifying performance criteria and making the right choices will determine how well authorities and traffic managers are able to provide safer environments for their workers. This article summarizes performance requirements and development details of a precast slim temporary concrete safety barrier, slim temporary concrete safety barrier (STCSB 50), mainly utilized to guide the traffic flow and safely divide lanes on motorways. Having 50 cm in height with a width of only 24 cm at the base and 12 cm throughout its height makes STCSB 50 a very narrow and low-profile work zone barrier. The design was crash tested according to EN1317 requirements, and its performance clearly demonstrated its robustness as a state of the art safety barrier for work zone applications. Its implementation is therefore recommended to protect road users and construction site workers at work zone areas.