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Mohamed Salim

Publications and source records attributed to Mohamed Salim.

4 recordsLinked to original sources

Restricted summability of the multi-dimensional Cesàro means of Walsh-Kaczmarz-Fourier series

The properties of the maximal operator of the $(C,α)$-means ($α=(α_1,\ldots,α_d)$) of the multi-dimensional Walsh-Kaczmarz-Fourier series are discussed, where the set of indices is inside a cone-like set. We prove that the maximal operator is bounded from $H_p^γ$ to $L_p$ for $p_0< p $ ($p_0=\max{1/(1+α_k): k=1,\ldots, d}$) and is of weak type $(1,1)$. As a corollary we get the theorem of Simon \cite{S1} on the a.e. convergence of cone-restricted two-dimensional Fejér means of integrable functions. At the endpoint case $p=p_0$, we show that the maximal operator $σ^{κ,α,*}_L$ is not bounded from the Hardy space $H_{p_0}^γ$ to the space $L_{p_0}$.

math.CA

Data Dissemination And Collection Algorithms For Collaborative Sensor Networks Using Dynamic Cluster Heads

We develop novel data dissemination and collection algorithms for Wireless Sensor Networks (WSNs) in which we consider $n$ sensor nodes distributed randomly in a certain field to measure a physical phenomena. Such sensors have limited energy, shortage coverage range, bandwidth and memory constraints. We desire to disseminate nodes' data throughout the network such that a base station will be able to collect the sensed data by querying a small number of nodes. We propose two data dissemination and collection algorithms (DCA's) to solve this problem. Data dissemination is achieved through dynamical selection of some nodes. The selected nodes will be changed after a time slot $t$ and may be repeated after a period $T$.

cs.NI