RQ (AUTOMATIC-REPEAT-REQUEST) techniques, A including stop-and-wait, go-back-N, and selective repeat, are widely used for error control in data communication systems. Particularly, the go-back-N ARQ scheme is very popular because it provides higher throughput compared to stop-and-wait ARQ, and its implementation is simpler than selective repeat ARQ since it does not require buffering and resequ...

introduction: the old age is one of the vulnerable classes of people in every society. the most important issue concerning the improvement of health and quality of life of the old age deals with preservation of a high degree of their independence in physical activities and continuation of an active life. the present research aimed at comparing the effect of two types of physical activity in wat...

How would a human hundreds or thousands times more intelligent than the brightest human ever born till now be like? We must admit we can hardly guess. A human being of such intelligence will be so radically different from us that it can hardly, if at all, be recognized as human. If we had to go back along the evolutionary tree to identify a creature 1000 times less intelligent than the average ...

Just when you thought it was safe to go back into the water, I’m going to complicate things even further. The Nielsen-Wakely-Hey [5, 3, 4] approach is very flexible and very powerful, but even it doesn’t cover all possible scenarios. It allows for non-equilibrium scenarios in which the populations from which we sampled diverged from one another at different times, but suppose that we think our ...