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- 저자 : Khadr, Monette (검색결과 2 건)
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Jamming Resilient Multi-Channel Transmission for Cognitive Radio IoT-based Medical Networks
Khadr, Monette,Salameh, Haythem Bany,Ayyash, Moussa S.,Elgala, Hany,Almajali, Sufyan 한국통신학회 2022 Journal of communications and networks Vol.24 No.6
The era of the Internet-of-things (IoT) comes withtremendous burdens on pre-existing network infrastructures andprotocols due to spectrum scarcity and reliability concerns. Cognitive radio (CR) technology is proposed for IoT applica-tions to alleviate the spectrum scarcity paradigm. In CR-IoT-based networks, the IoT devices/nodes share the spectrum withprimary users (PUs). However, in order not to interfere with PUscommunications and to conform with the elevating throughputrequirements, efficient multi-radio/multi-channel assignment al-gorithms are required. Additionally, in order to ensure reliabletransmission, algorithms need to be resilient to jamming attacks,which have detrimental impacts on network performance. In thispaper, parallel-channel security-aware medium access control(PCS-MAC) is proposed as a probabilistic-based jamming re-silient multi-channel assignment algorithm proposed for medicalnetworks. PCS-MAC considers primary user activity, channelconditions, jamming attack levels, and data-rate requirementsto provide spectrally efficient data transmission between CR-IoT nodes subject to delay constraints under jamming attacks toassure the delivery of time-critical patient data. The performanceof PCS-MAC is practically validated using the open large-scalefuture Internet-of-things (FIT) IoT-LAB testbed. Practical resultsshow that our proposed algorithm significantly enhances networkperformance, yielding throughput rates that supersedes the state-of-the-art algorithms presented in literature.
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NEW SUBCLASS OF MEROMORPHIC MULTIVALENT FUNCTIONS ASSOCIATED WITH HYPERGEOMETRIC FUNCTION
Mohamed A. Khadr,Ahmed M. Ali,F. GHANIM 경남대학교 수학교육과 2021 Nonlinear Functional Analysis and Applications Vol.26 No.3
As hypergeometric meromorphic multivalent functions of the form\begin{equation*}L^{t,\rho }_{\varpi,\sigma }f(\zeta )=\frac{{ 1}}{{\zeta }^{\rho }}+\sum^{\infty }_{\kappa =0}{\frac{(\varpi)_{\kappa +{ 2}}}{(\sigma )_{\kappa +{ 2}}}\ \ .\ \ \frac{(\rho -(\kappa +{ 2}\rho )t)\ }{\rho }a_{\kappa +\rho }{\zeta }^{\kappa +\rho }}\end{equation*}contains a new subclass in the punctured unit disk ${\Sigma}^{S,D}_{\varpi,\sigma}\left(t,\kappa ,\rho \right)$ for $-1\le D <S\le 1$, this paper aims to determine sufficient conditions, distortion properties and radii of starlikeness and convexity for functions in the subclass $L^{t,\rho }_{\varpi,\sigma }f(\zeta )$.
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