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  1. 1141

    The Long-Term Effects of Reforming Social Security to Relieve Low-Income Households by Tom Krebs, Martin Scheffel, Manuela Barišić, Valentina Sara Consiglio

    Published 2021-10-01
    “…Abstract In this paper, we use a macroeconomic model to evaluate two reform proposals that, first, abolish the exemption from social security contributions for marginal employment (“mini jobs”) and, second, reduce social security contributions for low-income earners. …”
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    Secure opportunistic access control in D2D-enabled cellular network by Yajun CHEN, Xinsheng JI, Kaizhi HUANG, Jing YANG, Ming YI

    Published 2018-01-01
    “…The mutual interference between cellular links and D2D links can bring the secrecy gain to cellular users in D2D-enable cellular networks.To make full use of them,a cooperative secrecy transmission scheme was proposed based on wireless channels.The channel direction information and gains depict the interference from D2D links to cellular links and other D2D links in the proposed scheme.Firstly,only the D2D users which meet the limited interference conditions were accessed to cellular networks to ensure their reliable communications.It was assumed that legitimate users and eavesdroppers were independent two-dimensional homogeneous Poisson point processes (PPP) distribution.Then the security outage probability (SOP) was derived for cellular users and the connection outage probability (COP) for D2D users,and the impacts of interference thresholds were discussed on their performances.Next,an optimization model was given to minimize D2D users’ COP while ensuring the secrecy performance requirements of cellular users,thus achieving the optimal performance.Finally,simulation results verify the validity of the proposed scheme.…”
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  6. 1146

    Editorial: Multilevel medical security systems and big data in healthcare: trends and developments by Fei Fan, Siqin Wang

    Published 2025-01-01
    Subjects: “…multilevel medical security systems…”
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