Scopus İndeksli Yayınlar Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12573/395

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Has files: YesPublisher: search.filters.publisher.De Gruyter Open Ltd

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  • Article
    Citation - Scopus: 23
    A Survey of Dynamic Bandwidth Assignment Schemes for TDM-Based Passive Optical Network
    (De Gruyter Open Ltd, 2020-04-28) Butt, Rizwan Aslam; Ashraf, Muhammad Waqar; Faheem, Muhammed Yasir; Idrus, S. M.; Waqar Ashraf, M.
    In time division, multiple access (TDMA)-based passive optical network (PONs), a dynamic bandwidth assignment (DBA) is necessary for efficient utilization of the available bandwidth of the upstream link. An efficient DBA scheme can improve the upstream performance of a traffic class of an ONU in two ways. First, it can increase the bandwidth assignment to it by efficiently utilizing the available bandwidth. Secondly, it can reduce the channel and frame idle time by increasing the polling frequency and by assigning extra surplus bandwidth not used by the other ONUs. Many DBA schemes have been reported for both ITU PONs (GPON and XGPON) and IEEE PONs (EPON and 10G EPON). In this study, we explain the impact of DBA scheme on the upstream performance of PON and then do a thorough survey of both PON standards, categorize the DBA schemes and review them critically. Based on the literature review we also give our opinion on the most suitable DBA scheme for both type PONs on the basis of upstream delays, frame loss and bandwidth utilization efficiency. © 2020 Elsevier B.V., All rights reserved.
  • Article
    Citation - Scopus: 3
    "Literally I Grew Up" Secondary-Tertiary Transition in Mathematics for Engineering Students Beyond the Purely Cognitive Aspects
    (De Gruyter Open Ltd, 2023) Vinerean, Mirela C.; Liljekvist, Yvonne Elisabeth; Bengu, Elif
    High dropout rates in the first year of undergraduate studies are an expression of the secondary-tertiary transition problem and they seem to be particularly high in those degree programs where specialized mathematics courses are taught in the first year of study. Research shows that students' difficulties during the transition period cannot be reduced to purely cognitive factors. In this article, we address the secondary-tertiary transition problem in mathematics for engineering students. Based on a questionnaire with focus beyond the purely cognitive aspects, a comparison of the transition problem at three European mid-sized universities is carried out, to identify common challenges and difficulties, as well as differences. The questionnaire concentrates on the four dimensions (personal, organizational, content related, and social) and corresponding critical requirements for a successful transition described in Trautwein, C., & Bosse, E. (2017). The first year in higher education - critical requirements from the student perspective. Higher Education, 73, 371-387. A group of 308 first-year engineering students partook in the study. In the presentation, we highlight students' perceptions regarding the transition, changes, and challenges they experienced under the above-mentioned four dimensions and discuss similarities and differences between countries. © 2023 Elsevier B.V., All rights reserved.