WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7150
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Article Dam Body Sediment Movement on Rough Bed Downstream Due to Earthfill Dam Break(Taylor & Francis Ltd, 2025) Aksoy, Aysegul Ozgenc; Dogan, Mustafa; Tayfur, GokmenThis study investigated movement of flow and sediment due to earthfill dam failure induced by piping and overtopping, using 12.8 m laboratory flume. Dam (60 cm high, 202 cm base width) was built in three zones with two sediment sizes, and downstream channel included a rough bed of cubic blocks. Water levels were monitored with sensors, and final sediment profiles were mapped via laser scanning. Results showed that dam body eventually collapses (in 265 s after the piping, and in 100 s after the overtopping start) while flood flow carries a great portion of its sediment away. Sediment spreading occurred all over downstream area with significant variation in non-uniform thickness (15 cm to 1 cm). In the residential area, the sediment depth variation ranged from 12 cm to 6 cm. The blocks were submerged under muddy flow in both modes of failures. Higher flow levels (22 cm) were observed over smooth bed than rough bed (15 cm), in overtopping break. This was almost the opposite in the piping failure mode (13 cm in smooth, and 15 cm in rough bed case). These findings highlights the dominant role of failure mechanism and bed roughness in sediment transport and flood dynamics.Article Residues of the British Informal Empire: the Smyrna-Aydın Railway's Punta Square as the Future Centre of "Colonial" Smyrna(Routledge, 2025) Sheridan Gun, I.T.; Erten, E.Railways played a pivotal role in the Industrial Revolution, inspired by the expansion of colonial ambitions. They were often accompanied by infrastructural landmarks as postal offices, churches, and hospitals, representing imperial authority and connectivity. While the presence of these enclaves within colonies has been extensively studied, their significance in non-colonised regions, particularly within the Ottoman Empire, has received insufficient attention. The transformation of Smyrna (modern-day Izmir, Turkey) in the late nineteenth century reflects a reorganisation that aligned with Britain’s gentlemanly capitalism and imperialism. This paper aims to shed light on this subject through a detailed analysis of the Punta Railway Station and its surrounding area. Often relegated to a footnote in historical narratives as a “Little British Town,” the study area warrants re-evaluation in the context of informal imperialism. It illustrates how British colonial influence shaped Punta’s spatial and functional dynamics, embodying the concept of colonised spaces without formal colonisation. © 2025 Elsevier B.V., All rights reserved.Article Frontiers as a Rural Landscape: Conserving the Remains of the Roman Empire in Anatolia(Routledge Journals, Taylor & Francis Ltd, 2025) Tokoz, Ozge Deniz; Akis, TongucRoman frontiers, a part of which passes through Anatolia, are significant heritage remnants of the Roman Empire. Although essential steps have been taken to protect these frontiers and increase their visibility, efforts to protect the Roman frontier in Anatolia are insufficient. The construction of dams and the failure to consider archaeological sites and rural landscapes together create barriers to protection. This study investigates the conservation problems, implementations, and status of the Roman frontier in Anatolia. Common problems, exemplary legal regulations, and conservation practices are discussed by comparing the Anatolian and European frontier sections. Based on this discussion, we advocate for new legal regulations for rural-archaeological sites, increased research on the Roman frontier in Anatolia, greater awareness to strengthen its relationship with the public, and holistic conservation policies that prioritise the relationship of archaeological heritage with the landscape.Conference Object User Selection for Secure Massive Mimo Based Mobile Edge Computing With Delay-Sensitive Applications(IEEE, 2025) Yilmaz, Saadet Simay; Ozbek, BernaMobile edge computing (MEC) has been a promising technology that leverages cloud computing capabilities at the network edge to address compute-intensive and delay-sensitive applications of mobile users with limited resources. Employing massive multiple-input multiple-output (mMIMO) and nonorthogonal multiple access (NOMA) in the MEC system facilitates simultaneous task offloading for multiple users, resulting in increased spectral efficiency and decreased offloading delay. Despite the great potential of the mMIMO-NOMA-based MEC system, offloading computation tasks to MEC servers can introduce inherent security concerns and vulnerabilities. We address a notable gap in the existing literature by investigating the effect of user selection to minimize the delay in MEC while enhancing the security of this framework. Specifically, this paper presents a user selection strategy for an uplink mMIMO-NOMA-based secure MEC system in the presence of a malicious eavesdropper (Eve) to minimize offloading and computing delays, subject to the transmit power, computing resource, and secrecy rate constraints with remote computing. We propose a two-step secure user selection algorithm and solve the optimization problem with the active-set algorithm. The simulation results demonstrate the effectiveness of the proposed user selection strategy on secure MEC with a malicious Eve by minimizing the task execution delay compared to the benchmark schemes.Article Citation - WoS: 1Citation - Scopus: 1Green Border: Cinematic Storytelling as History of the Present(University Library System, University of Pittsburgh, 2024) Yakalı, D.; Erdoğan, Z.This article analyzes Agnieszka Holland’s film Green Border, which addresses the migrant crisis at the Belarus-Poland border, exploring how Foucault’s concept of “history of the present” applies to migration cinema. We argue that Green Border functions as a cinematic intervention that challenges audience perceptions of power structures and their resistance. The study also establishes criteria for analyzing films as “history of the present,” focusing on characteristics such as the immediate relevance of depicted events, the documentation of social issues, the film’s influence on public perception, and a multifaceted narrative construction. Ultimately, the framework shows how cinema reflects and shapes social, political, and cultural realities in real time. © 2024, University Library System, University of Pittsburgh. All rights reserved.Article Citation - WoS: 4Citation - Scopus: 4A Polymeric Copper Complex Based on a Pyrazole Derivative: Synthesis, Spectroscopic, X-Ray, and Biological Activity Studies(John Wiley and Sons Inc., 2024) Amin,M.A.; Diker,H.; Şahin,O.; Varlıklı, Canan; Soliman,A.A.A novel 1D coordination polymeric copper complex based on 4-(4′-nitrophenylhydrazono)-5-trifluoromethyl-2,4-dihydropyrazol-3-one was prepared and characterized spectroscopically and thermally and via X-ray crystallographic investigation. The prepared copper-based structure was proved to have a 1D coordination polymer. X-ray studies showed that the polymeric copper complex was of octahedral geometry, the ligand acted as a bidentate ligand, and the nitro group attached to the ligand acted as a bridging group. The cytotoxic activities of the copper polymer were evaluated including against MCF-7 cells (breast cancer cell line), HepG-2 cells (hepatocellular carcinoma), and HCT-116 cells (colon cancer cell line). The morphological alterations of the complex treated cells were investigated using an inverted microscope. The cell cycle and apoptosis were evaluated and reported. The copper polymer exhibited the best antitumor activity against HepG-2 cells (35.22 ± 4.80 μM) while also causing a decline in the G2/M phase and a remarkable enhancement in the early apoptosis. © 2024 John Wiley & Sons, Ltd.Article Citation - WoS: 1Citation - Scopus: 1Laser Surface Treatment Optimization of 1.2379 (Aisi D2) Tool Steel(Springernature, 2025) Ozbey, Sayit; Artem, Hatice SecilIndustrial applications require materials with specific surface quality and hardness properties. Laser surface treatment stands out as a cost-effective and effective method that improves surface performance by changing the structural and physical properties of the material. 1.2379 cold work tool steel is a commonly used material in die and mold industries for injection mold inserts; therefore, the surface properties of the material play a significant role. In this study, it is aimed to optimize laser parameters; the laser power, pulse duration, repetition rate and line spacing for the responses such as hardness and surface roughness. For this purpose, 1.2379 cold work tool surfaces were treated using a commercially available industrial ytterbium low-power pulsed fiber laser experimentally. Experiments were conducted based on 34 full factorials. Vickers hardness and micro-roughness measurements were performed on the laser-treated surfaces. Regression models were developed using experimental data and the appropriate models were selected for each response. The response variables were then optimized based on stochastic optimization methods: Nelder-Mead, Differential Evolution, Random Search and Simulated Annealing. The results indicate that a maximum hardness of 495 HV0.5 and a minimum surface roughness of 0.277 mu m were achieved, corresponding to a 61% increase and a 43% decrease, respectively, compared to the base metal.Conference Object Citation - WoS: 7On dual baer modules(American Mathematical Society, 2014) Tütüncü, Derya Keskin; Smith, Patrick F.; Toksoy, Sultan EylemIn this note we prove that any ring R is right cosemihereditary if and only if every finitely cogenerated injective right R-module is d-Rickart. Let M be a module. We prove that if M is a dual Baer module with the (D-2) condition, then S = End(R)(M) is a right self-injective ring. We also prove that if M = M-1 circle plus M-2 with M-2 semisimple, then M is dual Baer if and only if M-1 is dual Baer and every simple non-direct summand of M-1 does not embed in M-2.Article Citation - WoS: 4Citation - Scopus: 5Query optimization: Mobile agents versus accuracy of the cost estimation(CRL Publishing, 2005) Özakar, Belgin; Morvan, F.; Hameurlaint, A.Since an increasing number of diverse sources of data and information become available through World Wide Web, the field of distributed heterogeneous query processing attracts attention of the researchers. One of the main concerns is to reduce the amount of communication and the volume of data transferred in terms of query optimization where it is a real challenge to have the statistics of the resources predictable and up-to-date. Autonomy, proactivity and mobility features of mobile agents seem promising under some conditions. In this paper we are interested in the study of the efficiency of the mobile agents in relation with the approach of the cost model used during the optimization process. We present an execution model based on mobile agents. Performance evaluation shows the efficiency intervals of the execution model according to the estimation errors and the current state of the system. The major contribution of this paper is to point out the effective use of an execution model based on mobile agents in relation with the approach of the cost model and with the query type. © 2005 CRL Publishing Ltd.Book Part Citation - WoS: 59Citation - Scopus: 68Stem Cell Therapy for Multiple Sclerosis(Springer, 2019) Genç, Bilgesu; Bozan, Hemdem Rodi; Genç, Şermin; Genç, KürşadMultiple sclerosis (MS) is a chronic inflammatory, autoimmune, and neurodegenerative disease of the central nervous system (CNS). It is characterized by demyelination and neuronal loss that is induced by attack of autoreactive T cells to the myelin sheath and endogenous remyelination failure, eventually leading to functional neurological disability. Although recent evidence suggests that MS relapses are induced by environmental and exogenous triggers such as viral infections in a genetic background, its very complex pathogenesis is not completely understood. Therefore, the efficiency of current immunosuppression-based therapies of MS is too low, and emerging disease-modifying immunomodulatory agents such as fingolimod and dimethyl fumarate cannot stop progressive neurodegenerative process. Thus, the cell replacement therapy approach that aims to overcome neuronal cell loss and remyelination failure and to increase endogenous myelin repair capacity is considered as an alternative treatment option. A wide variety of preclinical studies, using experimental autoimmune encephalomyelitis model of MS, have recently shown that grafted cells with different origins including mesenchymal stem cells (MSCs), neural precursor and stem cells, and induced-pluripotent stem cells have the ability to repair CNS lesions and to recover functional neurological deficits. The results of ongoing autologous hematopoietic stem cell therapy studies, with the advantage of peripheral administration to the patients, have suggested that cell replacement therapy is also a feasible option for immunomodulatory treatment of MS. In this chapter, we overview cell sources and applications of the stem cell therapy for treatment of MS. We also discuss challenges including those associated with administration route, immune responses to grafted cells, integration of these cells to existing neural circuits, and risk of tumor growth. Finally, future prospects of stem cell therapy for MS are addressed.