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    Implications of node selection in decentralized federated learning
    (IEEE, 2023) Department of Computer Engineering; Lodhi, Ahnaf Hannan; Akgün, Barış; Özkasap, Öznur; Department of Computer Engineering; Graduate School of Sciences and Engineering; College of Engineering
    Decentralized Federated Learning (DFL) offers a fully distributed alternative to Federated Learning (FL). However, the lack of global information in a highly heterogeneous environment negatively impacts its performance. Node selection in FL has been suggested to improve both communication efficiency and convergence rate. In order to assess its impact on DFL performance, this work evaluates node selection using performance metrics. It also proposes and evaluates a time-varying parameterized node selection method for DFL employing validation accuracy and its per-round change. The mentioned criteria are evaluated using both hard and stochastic/soft selection on sparse networks. The results indicate that the bias associated with node selection adversely impacts performance as training progresses. Furthermore, under extreme conditions, soft selection is observed to result in higher diversity for better generalization, while a completely random selection is shown to be preferable with very limited participation.
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    Rethinking news trust in post-truth Turkey: immediacy as the imagined affordance of television and search engines
    (SAGE PUBLICATIONS INC, 2024) Department of Media and Visual Arts; Çamurdan, Suncem Koçer; Ünal, Nazlı Özkan; Department of Media and Visual Arts; College of Social Sciences and Humanities
    In today's post-truth world, news users grapple with the tension between growing distrust in news institutions and the need for "true" information. Based on a mixed-methods study conducted in Turkey, this paper examines strategies developed by news users to establish trust in media tools in the context of the COVID-19 pandemic and populist polarization. We first collected data with a nationally representative survey (N = 1089). Then, 30 media users filled out media diaries for 1 week. We interviewed diary participants at the end of the week. We also conducted a four-week-long participant observation in three locations. Based on this data, we argue that users build trust in news stories by attributing a sense of immediacy to specific media, namely television and search engines. This immediacy arises from people's desire to scrutinize the accuracy of news stories in Turkey's highly polarized media environment. We term this ascribed meaning of transparency the imagined affordance of immediacy, asserting that immediacy is crucial for forming trust in the post-truth era. Contrary to suggestions that news trust is diminishing in the post-truth era, our paper highlights citizens' creative strategies to reestablish trust in contemporary news media.