1,126 research outputs found
TAS-Based Incremental Hybrid Decode–Amplify–Forward Relaying for Physical Layer Security Enhancement
In this paper, a transmit antenna selection (TAS)-
based incremental hybrid decode-amplify-forward (IHDAF)
scheme is proposed to enhance physical layer security in cooperative
relay networks. Specifically, TAS is adopted at the
source in order to reduce the feedback overhead. In the proposed
TAS-based IHDAF scheme, the network transmits signals to the
destination adaptive select direction transmission mode, AF mode
or DF mode depending on the capacity of the source-relay link
and source-relay link. In order to fully examine the benefits
of the proposed TAS-based IHDAF scheme, we first derive its
secrecy outage probability (SOP) in a closed-form expression. We
then conduct asymptotic analysis on the SOP, which reveals the
secrecy performance floor of the proposed TAS-based IHDAF
scheme when no channel state information is available at the
source. Theoretical analysis and simulation results demonstrate
that the proposed TAS-based IHDAF scheme outperforms the
selective decode-and-forward (SDF), the incremental decodeand-forward
(IDF), and the noncooperative direction transmission
(DT) schemes in terms of the SOP and effective secrecy
throughout, especially when the relay is close to the destination.
Furthermore, the proposed TAS-based IHDAF scheme offer a
good trade-off between complexity and performance compare
with using all antennas at the source.ARC Discovery Projects Grant DP150103905
Lactulose enhances neuroplasticity to improve cognitive function in early hepatic encephalopathy
Lactulose is known to improve cognitive function in patients with early hepatic encephalopathy; however, the underlying mechanism remains poorly understood. In the present study, we investigated the behavioral and neurochemical effects of lactulose in a rat model of early hepatic encephalopathy induced by carbon tetrachloride. Immunohistochemistry showed that lactulose treatment promoted neurogenesis and increased the number of neurons and astrocytes in the hippocampus. Moreover, lactulose-treated rats showed shorter escape latencies than model rats in the Morris water maze, indicating that lactulose improved the cognitive impairments caused by hepatic encephalopathy. The present findings suggest that lactulose effectively improves cognitive function by enhancing neuroplasticity in a rat model of early hepatic encephalopathy
Simulation of the global contrail radiative forcing: A sensitivity analysis
Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/96352/1/grl29839.pd
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