Abstract An optimal power allocation (OPA) policy for orthogonal frequency division multiplexing (OFDM)-based cognitive radio networks (CRNs) using underlay spectrum access model is presented under multiple secondary users (SUs) with energy harvesting (EH).The proposed algorithm can allocate transmission power to each SU on each subcarrier with the
In wireless sensor networks (WSNs), power consumption is an important aspect when designing routing protocols.When compared to other components of a sensor node, the power required by radio transmitters is responsible for most of the consumption.One way to optimize energy consumption is by using energy-aware protocols.Such protocols take into consi
Abstract Background The use of repellent materials from plants against nuisance insects is common with great potential to compliment existing malaria control programmes and this requires evaluation in the field.Ocimum plant species, Ocimum suave (Willd) Gift Card and O.kilimandscharicum (Guerke) materials and their essential oils extracted by steam
In South-East Asia, the maternal and child mortality rate has declined over the past decades; however, it varies among and within the countries in the region, including Cambodia.The continuum of care is an integrated series of care that women and children are required to avail continuously from pregnancy to the child/motherhood period.This study ai
Introduction: Meningiomas are slow growing primary central nervous system (CNS) tumours attached to the duramater, which arise from the meningothelial cells of the arachnoid.Grading of meningioma based on histological findings assisted with supplementary immunohistochemical studies, predicts the prognosis of meningioma with good precision.Aim: To e