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ICC
1997
IEEE
113views Communications» more  ICC 1997»
15 years 5 months ago
Improved Performance QPSK Demodulator for Digital Satellite Radio
: Practical realizations of the optimum closed loop structure for coherent demodulation of QPSK signals demands the approximation of the hyperbolic tangent nonlinearity (Tanh) with...
Alexandre G. Melo, Henrique J. A. da Silva
BMCBI
2005
114views more  BMCBI 2005»
15 years 1 months ago
A new decoding algorithm for hidden Markov models improves the prediction of the topology of all-beta membrane proteins
Background: Structure prediction of membrane proteins is still a challenging computational problem. Hidden Markov models (HMM) have been successfully applied to the problem of pre...
Piero Fariselli, Pier Luigi Martelli, Rita Casadio
ICDE
2009
IEEE
182views Database» more  ICDE 2009»
16 years 3 months ago
Adaptive Parallelization of Queries over Dependent Web Service Calls
We have developed a system to process database queries over composed data providing web services. The queries are transformed into execution plans containing an operator that invok...
Manivasakan Sabesan, Tore Risch
GECCO
2011
Springer
276views Optimization» more  GECCO 2011»
14 years 4 months ago
Evolution of reward functions for reinforcement learning
The reward functions that drive reinforcement learning systems are generally derived directly from the descriptions of the problems that the systems are being used to solve. In so...
Scott Niekum, Lee Spector, Andrew G. Barto
SIGIR
2012
ACM
13 years 3 months ago
To index or not to index: time-space trade-offs in search engines with positional ranking functions
Positional ranking functions, widely used in web search engines, improve result quality by exploiting the positions of the query terms within documents. However, it is well known ...
Diego Arroyuelo, Senén González, Mau...