Crossover clinical trials can provide substantial benefits by eliminating inter-patient variation from treatment comparisons and by allowing multiple observations of each patient. They are particularly useful when sample sizes are necessarily small. These advantages proved particularly valuable in an assessment of clot prevention in children undergoing haemodialysis. Only small numbers of child...

Atmospheric effects on radio frequency transmissions have been studied extensively since the advent of radio usage in military applications, yet the effects on shorter range transmissions have been less well covered. This study attempts to find correlations between atmospheric conditions and the transmission efficiency of IEEE 802.11g, using HTTP as the high level transport mechanism. This stud...

Coding/decoding techniques represent important error correction methods in multiple access transmissions which ensure reliable communications. This paper aims to evaluate the results obtained by combining of two relevant techniques (convolutional and LDPC), analyzing their joint effects based on the BER performances. Multiple access transmission is achieved with different types of signature seq...

We develop an approach to studying public opinion that accounts for how people process competing messages received over the course of a political campaign or policy debate. Instead of focusing on the fixed impact of a message, we emphasize that a message can have variable effects depending on when it is received within a competitive context and how it is evaluated. We test hypotheses about the ...