Optimizing Back-Propagation Gradient for Classification by an Artificial Neural Network
Said El Yamani,
Samir Zeriouh,
Mustapha Boutahri,
Ahmed Roukhe
Issue:
Volume 2, Issue 4, July 2014
Pages:
88-94
Received:
13 July 2014
Accepted:
28 July 2014
Published:
10 August 2014
Abstract: In a complex and changing a remote sensing system, which requires taking quick and informed decisions environment, connectionist methods have shown their great contribution in particular the reduction and classification of spectral data. In this context, this paper proposes to study the parameters that optimize the results of an artificial neural network ANN multilayer perceptron based, for classification of chemical agents on multi-spectral images. The mean squared error cost function remains one of the major parameters of the network convergence at its learning phase and a challenge that will face our approach to improve the gradient descent by the conjugate gradient method that seems fast and efficient.
Abstract: In a complex and changing a remote sensing system, which requires taking quick and informed decisions environment, connectionist methods have shown their great contribution in particular the reduction and classification of spectral data. In this context, this paper proposes to study the parameters that optimize the results of an artificial neural n...
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54 Xe and 36Kr Gas Filled Proportional Counters and Characteristic X-Rays Detection
Hemn,
Muhammad Salh,
Ari,
Maghdid Hamad
Issue:
Volume 2, Issue 4, July 2014
Pages:
95-103
Received:
26 July 2014
Accepted:
18 August 2014
Published:
30 August 2014
Abstract: This study examines several important features of characteristic X-rays, including their production, spectroscopy and interactions with materials. Characteristic X-rays for different elements (29Cu, 42Mo, 47Ag, 56Ba and 65Tb) were obtained from a variable energy X-ray source by using gamma rays around 60 keV from 241Am. It was found that the energy and intensity of generated characteristic X-ray photons are proportional to the atomic number of the targets within the variable energy X-ray source. In addition, X-ray spectroscopy for such targets was investigated by using two gas- filled (54 Xe and 36Kr) proportional counters. Furthermore, it was discovered that the probability of photoelectric absorption of (54 Xe) gas-filled proportional counter is almost 1.5 times higher than the probability of photoelectric absorption of (36 Kr) gas-filled proportional counter.
Abstract: This study examines several important features of characteristic X-rays, including their production, spectroscopy and interactions with materials. Characteristic X-rays for different elements (29Cu, 42Mo, 47Ag, 56Ba and 65Tb) were obtained from a variable energy X-ray source by using gamma rays around 60 keV from 241Am. It was found that the energy...
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