@Article{DíscolaJúniorCecaFernRibe:2018:FlSeMi,
author = "D{\'{\i}}scola J{\'u}nior, S{\'e}rgio Luisir and Cecatto,
Jos{\'e} Roberto and Fernandes, M{\'a}rcio Merino and Ribeiro,
Marcela Xavier",
affiliation = "{Universidade Federal de S{\~a}o Carlos (UFCar)} and {Instituto
Nacional de Pesquisas Espaciais (INPE)} and {Universidade Federal
de S{\~a}o Carlos (UFCar)} and {Universidade Federal de S{\~a}o
Carlos (UFCar)}",
title = "SeMiner: a flexible sequence miner method to forecast solar time
series",
journal = "Information (Switzerland)",
year = "2018",
volume = "9",
number = "1",
pages = "e8",
month = "jan.",
keywords = "solar flare, X-rays, k-nearest neighbour classifier, sliding
window, forecasting, time series, data mining, feature selection,
graphical processing unit (GPU), CUDA.",
abstract = "X-rays emitted by the Sun can damage electronic devices of
spaceships, satellites, positioning systems and electricity
distribution grids. Thus, the forecasting of solar X-rays is
needed to warn organizations and mitigate undesirable effects.
Traditional mining classification methods categorize observations
into labels, and we aim to extend this approach to predict future
X-ray levels. Therefore, we developed the SeMiner method, which
allows the prediction of future events. SeMiner processes X-rays
into sequences employing a new algorithm called Series-to-Sequence
(SS). It employs a sliding window approach configured by a
specialist. Then, the sequences are submitted to a classifier to
generate a model that predicts X-ray levels. An optimized version
of SS was also developed using parallelization techniques and
Graphical Processing Units, in order to speed up the entire
forecasting process. The obtained results indicate that SeMiner is
well-suited to predict solar X-rays and solar flares within the
defined time range. It reached more than 90% of accuracy for a
2-day forecast, and more than 80% of True Positive (TPR) and True
Negative (TNR) rates predicting X-ray levels. It also reached an
accuracy of 72.7%, with a TPR of 70.9% and TNR of 79.7% when
predicting solar flares. Moreover, the optimized version of SS
proved to be 4.36 faster than its initial version.",
doi = "10.3390/info9010008",
url = "http://dx.doi.org/10.3390/info9010008",
issn = "2078-2489",
language = "en",
targetfile = "discola_seminer.pdf",
urlaccessdate = "27 abr. 2024"
}