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The global signal is widely used as a regressor or normalization factor for removing the effects of global variations in the analysis of functional magnetic resonance imaging (fMRI) studies. However, there is considerable controversy over its use because of the potential bias that can be introduced when it is applied to the analysis of both task-related and resting-state fMRI studies. In this paper...
Subtle changes in either breathing pattern or cardiac pulse rate alter blood oxygen level dependent functional magnetic resonance imaging signal (BOLD fMRI). This is problematic because such fluctuations could possibly not be related to underlying neuronal activations of interest but instead the source of physiological noise. Several methods have been proposed to eliminate physiological noise in BOLD...
Optical wireless networks often require more than one transmitter to maintain consistent connection with a single receiver. Accordingly, an efficient control mechanism is required to address challenges associated with multiple access to the receiver. This paper proposes a receiver access control (RAC) mechanism for optical wireless mesh networks that focuses on the optimization of classical RTS/CTS...
The performance of Free Space Optical (FSO) links is severely influenced by misalignment of optical nodes. Pointing errors and misalignment can be caused as a result of unintentional optical heads sway induced by external sources. Misalignment can be also considered intentionally under some cases, e.g. mobile FSO, to establish optical connections while maintaining node mobility. In this paper, the...
Due to inconsistent atmospheric conditions, scattering and scintillation of free space optical (FSO) signal can occur, thus negatively influencing the received signal intensity. The channel is usually modeled as a normalized fading coefficient with additive Gaussian noise. Optimal detection of the received signal is designed based on a decision rule, e.g., Maximum Likelihood (ML), assuming the receiver...
Even if a line-of-sight condition of Free Space Optics (FSO) is satisfied, atmospheric-induced fading, scattering, and attenuation may severely deteriorate the availability of the communication link. This argument is true except in reconfigurable FSO ad hoc networks, a path reconfiguration scheme replaces a severed FSO link with an operational one. Reconfigurability, as a property of our hybrid FSO/RF...
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