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Minimal perceptrons for memorizing complex patterns
Pastor, M.,Song, J.,Hoang, D.T.,Jo, J. North-Holland Pub. Co 2016 PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIO Vol.462 No.-
Feedforward neural networks have been investigated to understand learning and memory, as well as applied to numerous practical problems in pattern classification. It is a rule of thumb that more complex tasks require larger networks. However, the design of optimal network architectures for specific tasks is still an unsolved fundamental problem. In this study, we consider three-layered neural networks for memorizing binary patterns. We developed a new complexity measure of binary patterns, and estimated the minimal network size for memorizing them as a function of their complexity. We formulated the minimal network size for regular, random, and complex patterns. In particular, the minimal size for complex patterns, which are neither ordered nor disordered, was predicted by measuring their Hamming distances from known ordered patterns. Our predictions agree with simulations based on the back-propagation algorithm.
Study of Chloride Corrosion Organic Inhibitors in Alkaline Pore Solution
( M. Cabrini ),( S. Lorenzi ),( T. Pastore ),( S. Pellegrini ) 한국부식방식학회(구 한국부식학회) 2018 Corrosion Science and Technology Vol.17 No.5
This paper compares the inhibition properties of aspartic and lactic acid salts with nitrite ions and their effect on critical chloride concentration. The tests were carried employing carbon steel specimens in saturated lime solution with varying pH in the range between13 to 13.6. The critical chloride concentration was estimated through multiple specimen potentiostatic tests at potentials in the usual range for passive rebar in the alkaline concrete of atmospheric structures. During tests, chloride salt was added every 48 h until all the specimens showed localized attacks. The cumulative distribution curves, i.e. the number of corroded specimens as a function of the chlorides concentration was obtained. Furthermore, IR spectra were recorded for the evaluation of the presence of the organic inhibitors on the passivity film. The results confirmed the inhibitory effect of 0.1M aspartate comparable with nitrite ions, at a similar concentration. Addition of calcium lactate did not result in an increase in the critical chloride concentration. However, the formation of a massive scale containing the substance that could reduce the corrosion propagation was observed.
Inference of magnetic fields in the very quiet Sun
Martí,nez Gonzá,lez, M. J.,Pastor Yabar, A.,Lagg, A.,Asensio Ramos, A.,Collados, M.,Solanki, S. K.,Balthasar, H.,Berkefeld, T.,Denker, C.,Doerr, H. P.,Feller, A.,Franz, M.,Gonzá,lez EDP Sciences 2016 Astronomy and astrophysics Vol.596 No.-
Deep probing of the photospheric sunspot penumbra: no evidence of field-free gaps
Borrero, J. M.,Asensio Ramos, A.,Collados, M.,Schlichenmaier, R.,Balthasar, H.,Franz, M.,Rezaei, R.,Kiess, C.,Orozco Suá,rez, D.,Pastor, A.,Berkefeld, T.,von der Lü,he, O.,Schmidt, D.,Schmid Springer-Verlag 2016 Astronomy and astrophysics Vol.596 No.-
Upper chromospheric magnetic field of a sunspot penumbra: observations of fine structure
Joshi, J.,Lagg, A.,Solanki, S. K.,Feller, A.,Collados, M.,Orozco Suá,rez, D.,Schlichenmaier, R.,Franz, M.,Balthasar, H.,Denker, C.,Berkefeld, T.,Hofmann, A.,Kiess, C.,Nicklas, H.,Pastor Yabar, A Springer-Verlag 2016 Astronomy and astrophysics Vol.596 No.-