3,582 research outputs found
A Software Package for Neural Network Applications Development
Original Backprop (Version 1.2) is an MS-DOS package of four stand-alone C-language programs that enable users to develop neural network solutions to a variety of practical problems. Original Backprop generates three-layer, feed-forward (series-coupled) networks which map fixed-length input vectors into fixed length output vectors through an intermediate (hidden) layer of binary threshold units. Version 1.2 can handle up to 200 input vectors at a time, each having up to 128 real-valued components. The first subprogram, TSET, appends a number (up to 16) of classification bits to each input, thus creating a training set of input output pairs. The second subprogram, BACKPROP, creates a trilayer network to do the prescribed mapping and modifies the weights of its connections incrementally until the training set is leaned. The learning algorithm is the 'back-propagating error correction procedures first described by F. Rosenblatt in 1961. The third subprogram, VIEWNET, lets the trained network be examined, tested, and 'pruned' (by the deletion of unnecessary hidden units). The fourth subprogram, DONET, makes a TSR routine by which the finished product of the neural net design-and-training exercise can be consulted under other MS-DOS applications
Dowling-Degos Disease: Case Report and Review of the Literature
Dowling-Degos disease (DDD) is an unusual pigmentary disorder usually caused by mutations in keratin 5. A 44-year-old woman in good general health presented due to the recent appearance of numerous pigmented macules on her axillary and anogenital skin. A biopsy showed lacy, finger-like epidermal extensions into the dermis which were heavily pigmented and associated with tiny cysts or dilated follicles. We view DDD as part of a spectrum of disorders which are morphologically related but vary in location and time of expression. In addition, both the clinical and histological differential diagnostic considerations are extensive. Copyright (C) 2010 S. Karger AG, Base
J08069+1527: A newly discovered high amplitude, hybrid subdwarf B pulsator
We present our discovery of a new hybrid pulsating subdwarf B star,
J08069+1527. The effective temperature and surface gravity of 28,500400\,K
and 5.370.04\,dex, respectively, place this object inside the instability
strip and also among other pulsating hot subdwarfs of a hybrid nature, right
next to another fascinating star: Balloon\,090100001. From this proximity, we
anticipated this star could pulsate in both high and low frequency modes.
Indeed, our analysis of photometric data confirmed our prediction. We detected
two peaks in the high frequency region and two other peaks at low frequencies.
In addition, the amplitude of the dominant mode is very high and comparable to
the dominant peaks in other hybrid subdwarf B stars. Since this star is bright,
we performed time-series low resolution spectroscopy. Despite a low
signal-to-noise (S/N) ratio, we were able to detect the main peak from these
data. All our results strongly indicate that J08069+1527 is a high amplitude
pulsating hot subdwarf B star of hybrid nature. By analogy to the other
pulsating sdB star, we judge that the dominant mode we detected here has radial
nature. Future stellar modeling should provide us with quite good constrains as
p- and g-modes presented in this star are driven in different parts of its
interior.Comment: 7 pages, 10 figures, accepted for publication in MNRA
Isospin Distillation with Radial Flow: a Test of the Nuclear Symmetry Energy
We discuss mechanisms related to isospin transport in central collisions
between neutron-rich systems at Fermi energies. A fully consistent study of the
isospin distillation and expansion dynamics in two-component systems is
presented in the framework of a stochastic transport theory. We analyze
correlations between fragment observables, focusing on the study of the average
N/Z of fragments, as a function of their kinetic energy. We identify an
EOS-dependent relation between these observables, allowing to better
characterize the fragmentation path and to access new information on the low
density behavior of the symmetry energy.Comment: 4 pages, 4 figures (revtex4
How Effectively Are We Managing Innovation?
The writer\u27s observe that top management\u27s stated commitment to innovation has yet to be successfully infused into many organizations
On symmetries of the Gibbons-Tsarev equation
We study the Gibbons-Tsarev equation and, using the known Lax pair, we construct infinite series of conservation
laws and the algebra of nonlocal symmetries in the covering associated with
these conservation laws. We prove that the algebra is isomorphic to the Witt
algebra. Finally, we show that the constructed symmetries are unique in the
class of polynomial ones.Comment: 36 pages; minor corrections and improvement
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