Crowdsourcing mechanisms such as Amazon Mechanical Turk (AMT) or the ESP game are now routinely being used for labelling data for machine learning and other computational intelligence applications. I will discuss three important aspects of crowdsourcing which can help us tap into this powerful new resource in a more efficient way. When obtaining training data from a crowdsourcing system for the...

We analyze the “field-field” cross correlation associated with scattered coda waves, observed at a pair of distinct receivers, to obtain an estimate of the Green’s function between the receivers with an emphasis on high-frequency body waves. The scattered waves are generated in a slab with random medium fluctuations by an incident wave packet. Following the dyadic parabolic scaling of wave pack...

We consider here a ow control mechanism in which the rate at which data is sent increases linearly in time until a loss occurs. At that point the transmission rate decreases by a multiplicative factor. This mechanism is a good approximation to TCP/IP, the congestion control in the Internet. Losses are generated by some exogenous random process, which is assumed to be stationary ergodic; no Mark...