The impossible comunication

Comunication-Efficient Algorithms for Statistical Optimization

We analyze two communication-efficient algorithms for distributed optimization in statistical settings involving large-scale data sets. The first algorithm is a standard averaging method that distributes the N data samples evenly to m machines, performs separate minimization on each subset, and then averages the estimates. We provide a sharp analysis of this average mixture algorithm, showing t...

The Possible ‘Impossible’ Turn

Turning back after engine failure during the take off phase of flight in a single engine aircraft is examined using a simplified analytical model. The important parameters are identified. The analysis shows that the optimum flight path is teardrop shaped with a 45◦ bank angle at stall velocity during the turn. The effects of engine failure altitude, wind direction and velocity, and bank angle o...

Audio Quality Measurements in Comunication Systems

ITU gives P-class recommendations for the measurement of audio quality in communication systems. The recommendations are based on system transfer function estimation, nonlinear distortion measurement and perceptual evaluation of audio signal degradation. This work shows and discusses implementation of these methods in real-time "point-to-point" testing of communication systems. A refinement of ...

The Impossible Thing

W hat is it?,” Sierra Rodriguez asked her older brother. “You’ll have to guess,” Billy answered. Sierra looked up at the object that was hanging —almost as if levitating —from two crisscrossed cables in the barn. “Does it y?” she asked. “Nope. It lights up.” “So you mean it’s just a light,” she said, glaring at her brother. “What’s so special about—” “It’s not just a light.” Billy began moving ...

Imagining the Impossible