2045 research outputs found
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Base Station-Assisted Cooperative Network Coding for Cellular Systems with Link Constraints
No full textWe consider a novel distributed data storage/caching scenario in a cellular network, where multiple nodes may fail/depart simultaneously To meet reliability, we allow cooperative regeneration of lost nodes with the help of base stations allocated in a set of hierarchical layers1. Due to this layered structure, a symbol download from each base station has a different cost, while the link capacities between the nodes of the cellular system and the base stations are also constrained. Under such a setting, we formulate the fundamental trade-off with closed form expressions between repair bandwidth cost and the storage space per node. Particularly, the minimum storage as well as bandwidth cost points are formulated. Finally, we provide an explicit optimal code construction for the minimum storage regeneration point for a special set of system parameters.2-s2.0-85136290014Hazira
Propulsive performance of plunging airfoils in biplane configuration
No full textBiplane configuration of pure plunging airfoils is investigated in terms of vortex dynamics both experimentally and numerically by utilizing particle image velocimetry and unstructured finite volume solver of incompressible unsteady Navier-Stokes equations. Experiments are carried out to disclose the vortex shedding and interaction mechanisms for various values of frequency and amplitude of the plunging motion. For the non-dimensional plunge amplitude with respect to the chord of airfoil h = 0.2, the effect of the reduced circular frequency based on chord length and the free stream velocity k = 1 and 10 are considered, whereas for h = 0.3, k = 2, 4, 8, and 10 cases are examined. Influence of the plunge amplitude is studied for h = 0.25 at k = 2.5 and for h = 0.0875, 0.15, and 0.3 at k = 4. Numerical simulations are performed to investigate the effect of phase difference on vortex structures and propulsive characteristics, such as thrust and Froude efficiency. Two cases having the highest thrust and efficiency values k = 2.5, h = 0.25, and k = 4, h = 0.15 value couples are selected for the phase angle of φ = 0 °, φ = 90 °, φ = 180 °, and φ = 270 °. Opposed plunge, φ = 180 °, was found as the most efficient amongst all phase angles that were investigated, where φ = 90 ° is beneficial in lift production. Additionally, three-dimensional simulations indicate no significant three dimensionalities for the parameters used herein.WOS:0007790597000042-s2.0-85126844181Science Citation Index ExpandedArticleUluslararası işbirliği ile yapılmayan - HAYIRNisanMar
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No full textKH00031MEF Kütüphane bilişim ve iletişim teknolojileri birim sorumlusu Ramazan Çelik, 02/12/2021 tarihinde, İstanbul Medeniyet Üniversitesi Bilgi ve Belge Yönetimi bölümü öğrencilerine yönelik "Kurumsal Akademik Arşiv Sistemi'nin Açık Erişimdeki Rolü MEF Üniversitesi Kütüphanesi "DSpace” Uygulama Örneği" adlı çevrimiçi eğitim gerçekleştirmiştir.Nisa
Missing the good old days: Investigating outgroup attitudes through collective nostalgia and global identification
No full textCollective nostalgia is a group-based emotion that refers to the longing for the “good old days” of one's ingroup. Research shows that collective nostalgia usually benefits relationships with other in-group members, while hampering intergroup relations. However, this depends on the past remembered. Moreover, global identification predicts positive intergroup relations, yet this depends on whether the target group is perceived to be aligned with a global culture. Accordingly, we tested how collective nostalgia and global identification can then be linked to inclusionary vs. exclusionary outgroup attitudes in Turkey in relation to Kurds, Armenians, LGBTQ+ individuals and Syrian refugees. The results showed (N = 1090) that collective nostalgia was related to positive attitudes towards Kurds, Armenians and gay men, whereas it was negatively related to attitudes towards Syrian refugees. Moreover, contrary to expectations, we found that global identification predicted positive attitudes towards all outgroups. These findings are not surprising given the changing political climate and increasing intergroup conflict in Turkey. We speculate that the meaning attributed to the “good old days” of Turkey predicted these positive attitudes except for Syrian refugees who are perceived to be today's problem. Overall, the relationship between nostalgia and outgroup attitudes are more complex than research has so far shown, and the content of the past remembered might be important to understand this relationship.2-s2.0-85138517165Eylü
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No full textKH00070MEF Kütüphane bilişim ve iletişim teknolojileri birim sorumlusu Ramazan Çelik, 13/05/2020 tarihinde MEF Üniversitesi ve MEF Okulları işbirliği ile düzenlenen DP öğretmen ve öğrencilerine Turnitin eğitimini gerçekleştirdi.Mayı
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No full textKH00044MEF Kütüphane teknik hizmetler birim sorumlusu Bahar Biçen Aras, 14/04/2021 tarihinde, Bartın Üniversitesi Bilgi ve Belge Yönetimi bölümü öğrencilerine Bilgi Merkezleri dersi kapsamında, "Yarının Kütüphanelerine Hazır mıyız?: “ Y ve Z kuşağı için kütüphane ve hizmetlerini tasarlamak: #MEFteKütüphane" başlıklı eğitimi gerçekleştirdi.Nisa
Social media marketing of brands in the COVID-19 pandemic: Exploring the crisis-related content
No full textThis chapter explores the social media marketing communication of brands in the first days of the novel coronavirus (COVID-19) outbreak within the theoretical framework provided by signaling theory. The social media content of six Turkish brands was examined by content analysis. The findings have shown that brands shared posts in four themes: brand promotion, brand's COVID-19 messages, product promotion, and special day posts. Brands integrated the COVID-19 agenda in their social media communication in two ways. First, they designed and shared posts that focused solely on the pandemic. These COVID-19-related posts constituted a separate category that did not include any direct relevance to the brands' promotion activities. Second, they added COVID-19-related points in their social media posts. This study provides valuable findings for marketing practitioners and academicians regarding social media communication in a global health crisis
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No full textKH00095MEF Üniversitesi Kütüphane Direktörü Ertuğrul Çimen, V. Ulusal Kaynak Paylaşım Çalıştayı’nda “Yerelden Küresele ILL Kütüphaneciliği: Fırsatlar ve Kariyer Hedefleri” başlıklı sunumuyla konuşmacı olarak yer aldı.Mayı
Efficient Strategy for Multi-UAV Path Planning in Target Coverage Problems
No full textIn recent years, multi unmanned aerial vehicles (UAVs) are used in the same system to accomplish more complex missions. In many multi-UAV system applications, the main objective is to visit some predetermined checkpoints in operational area. If the number of check points and constraints increases, finding a feasible solution takes up too much time. In this paper, a checkpoint based multi-UAV path planning problem is solved by using improved genetic algorithm. The main contributions of this paper are: (1) the introducing revisit time interval concept, (2) the investigating of the effect of objective function description, and (3) looking into an outcome of using multiple runways on optimal multi-UAV path planning. The proposed strategy-based optimization methodology is performed for checkpoint based multi-UAV path planning problems in two-dimensional (2D) environment. Performance results show that the proposed strategy provides effective and feasible paths for each UAV.IEEE,IEEE Algeria Sect,Istanbul Gedik Univ,AJRESD Journal,Lab Dev Durable InformatiqueWOS:0009328425000192-s2.0-85147092679Conference Proceedings Citation Index – ScienceProceedings PaperUluslararası işbirliği ile yapılmayan - HAYIRMartYÖK - 2022-2
