In this paper, a novel approach for the estimation of global solar irradiance is proposed based on a combination of empirical correlation and ant colony optimization. Empirical correlation has been used to estimate monthly average of daily global solar irradiance on a horizontal surface. The Ant Colony Optimization (ACO) algorithm has been applied as a swarm-intelligence technique to tune the c...

Our group at the National Institute of Standards and Technology (NIST) is in the initial phase of developing a prototype laser-cooled atomic frequency standard (AFS) for potential use in a future global positioning system (GPS) system. The expected fractional frequency stability or Allan deviation, σy(τ), will be 2 × 10 -13 at one second, improving as the square-root of the averaging time to 7 ...

Brain tumors can cause serious health complications and lead to death if not detected accurately. Therefore, early-stage detection of brain accurate classification types play a major role in diagnosis. Recently, deep convolutional neural network (DCNN) based approaches using magnetic resonance imaging (MRI) images have shown excellent performance tasks. However, the accuracy DCNN architectures ...