Hasan Dumanli

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We assessed ten prenatal magnetic resonance imaging(MRI) scans for fetal brain anomalies, and identified eight that were suitable for post-processing. Anatomical abnormalities were assessed on three-dimensional (3D) models and compared with two-dimensional (2D) imaging. We calculated the volumes of the intracranial ventricles and of a periventricular(More)
Wireless access is known to be power-hungry for mobile devices. A key reason is that devices radiate power in all directions and much of this power will not reach the destination. To address this waste, we present <i>BeamSwitch</i>, a multi-antenna system designed to realize directional communication efficiently. Unlike power-hungry and expensive(More)
Directional communication has the potential to improve the energy efficiency of wireless communication without sacrificing its quality. We present a system solution, BeamSwitch, for directional communication on mobile devices. BeamSwitch employs a special multi-antenna system that consists of multiple identical directional antennas 1 , or beams, a single(More)
The RF chain power consumption can be broken into that by the PA, , and that by the rest of the RF chain,. Since only is dependent on the transmission signal power, P tx , and can be considered as constant during the transmission, the total RF chain power can be calculated as Assuming that the PA efficiency, α, is independent from transmitting power, ,, we(More)
Directional communication has the potential to improve both the energy efficiency of wireless communication without sacrificing its quality. We present a system solution, BeamSwitch, for directional communication on mobile devices. BeamSwitch employs a special multi-antenna system that consists of multiple identical directional antenna or beams, a single(More)
The radio front-end (RF) is a major power consumer on mobile systems. In particular, the power amplifier (PA) is the most power-hungry component for wireless transmission. We aim at significantly reducing the energy consumption by the PA in 802.11 interfaces by using directional antennas, or directional transmission, without changing the network(More)
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