359 research outputs found
A model structure on GCat
We define a model structure on the category GCat of small categories with an
action by a finite group G by lifting the Thomason model structure on Cat. We
show there is a Quillen equivalence between GCat with this model structure and
GTop with the standard model structure.Comment: 12 pages. Final version. Will appear in Proceedings for WIT (Women in
Topology Workshop
Rigidity in Equivariant Stable Homotopy Theory
For any finite group G, we show that the 2-local G-equivariant stable
homotopy category, indexed on a complete G-universe, has a unique equivariant
model in the sense of Quillen model categories. This means that the suspension
functor, homotopy cofiber sequences and the stable Burnside category determine
all "higher order structure" of the 2-local G-equivariant stable homotopy
category, such as the equivariant homotopy types of function G-spaces. The
theorem can be seen as an equivariant version of Schwede's rigidity theorem at
the prime 2
A Tight Upper Bound on the Number of Candidate Patterns
In the context of mining for frequent patterns using the standard levelwise
algorithm, the following question arises: given the current level and the
current set of frequent patterns, what is the maximal number of candidate
patterns that can be generated on the next level? We answer this question by
providing a tight upper bound, derived from a combinatorial result from the
sixties by Kruskal and Katona. Our result is useful to reduce the number of
database scans
Discovering correlated parameters in Semiconductor Manufacturing processes: a Data Mining approach
International audienceData mining tools are nowadays becoming more and more popular in the semiconductor manufacturing industry, and especially in yield-oriented enhancement techniques. This is because conventional approaches fail to extract hidden relationships between numerous complex process control parameters. In order to highlight correlations between such parameters, we propose in this paper a complete knowledge discovery in databases (KDD) model. The mining heart of the model uses a new method derived from association rules programming, and is based on two concepts: decision correlation rules and contingency vectors. The first concept results from a cross fertilization between correlation and decision rules. It enables relevant links to be highlighted between sets of values of a relation and the values of sets of targets belonging to the same relation. Decision correlation rules are built on the twofold basis of the chi-squared measure and of the support of the extracted values. Due to the very nature of the problem, levelwise algorithms only allow extraction of results with long execution times and huge memory occupation. To offset these two problems, we propose an algorithm based both on the lectic order and contingency vectors, an alternate representation of contingency tables. This algorithm is the basis of our KDD model software, called MineCor. An overall presentation of its other functions, of some significant experimental results, and of associated performances are provided and discussed
A LightGBM-Based EEG Analysis Method for Driver Mental States Classification
Fatigue driving can easily lead to road traffic accidents and bring great harm to individuals and families. Recently, electroencephalography-
(EEG-) based physiological and brain activities for fatigue detection have been increasingly investigated.
However, how to find an effective method or model to timely and efficiently detect the mental states of drivers still remains a
challenge. In this paper, we combine common spatial pattern (CSP) and propose a light-weighted classifier, LightFD, which is
based on gradient boosting framework for EEG mental states identification. ,e comparable results with traditional classifiers,
such as support vector machine (SVM), convolutional neural network (CNN), gated recurrent unit (GRU), and large margin
nearest neighbor (LMNN), show that the proposed model could achieve better classification performance, as well as the decision
efficiency. Furthermore, we also test and validate that LightFD has better transfer learning performance in EEG classification of
driver mental states. In summary, our proposed LightFD classifier has better performance in real-time EEG mental state
prediction, and it is expected to have broad application prospects in practical brain-computer interaction (BCI)
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