Scheduling real-time traffic in underwater acoustic wireless sensor networks

Underwater sensor networks are an important field of research. Several applications require the use of this kind of networks like tsunami or oil spill alerts. The underwater medium is very harsh and only acoustic signals can be used for the transmission of information. The use of this kind of networks is still in a developing state far from reaching standard consensus on basic aspects like carrier frequency or modulation techniques. The use of these networks for real-time applications has not been analyzed previously. In this paper we present two solutions for the scheduling of real-time messages and we provide a time constraint analysis of the performance of the network.Peer ReviewedPostprint (published version

Tp–e interval and Tp–e/QT ratio in patients with Human Immunodeficiency Virus

Human Immunodeficiency Virus (HIV) infection and AIDS are known to cause cardiovascular diseases such as premature coronary artery disease, cardiomyopathy, and arrhythmias. Recently, Tp–e interval and Tp–e/QT ratio has been shown as a novel marker of ventricular repolarization. We aimed to evaluate the ventricular repolarization using Tp–e interval and Tp–e/QT ratio in patients with Human Immunodeficiency Virus (HIV) infection. Totally 48 patients with HIV and 60 control subjects were enrolled to the study. Tp–e interval, Tp–e/QT and Tp–e/QTc ratio were measured from the 12-lead electrocardiogram. Tp–e interval, Tp–e/QT ratio and Tp–e/QTc ratio were significantly higher in patients with HIV than control subjects (all p < 0.01). In correlation analysis, there were positive correlation between Tp–e interval and disease duration (r = 0.298, p = 0.048). and inverse correlation between Tp–e interval and CD4 count(r = −0.303, p = 0.036). Our study showed that Tp–e interval, Tp–e/QT and Tp–e/QTc ratios were increased in patients with HIV than control subjects. Keywords: Human Immunodeficiency Virus, Tp–e interval, Tp–e/QT rati