112,253 research outputs found
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)
Parametric study for influence of input parameters for analysis of fibre reinforced concrete slab-soil interaction
For geotechnical engineering and design of
foundation elements of structures is important to properly
determine the stress-deformation state of the subsoil. The
calculation is most often done using the finite element
method and the computational models. This article
includes the parametric study for the selected type of
concrete foundation structures. The article focuses
attention to the calculation of the deformation of the slab
with respect to the influences of individual input
parameters (e.g. stiffness of concrete and subsoil,
boundary condition, size of elements). Calculations are
performed for two concrete types and three soil variants
Examining the results of the experimental solution with a focus to elastic effect area
Problematic of soil - structure - interaction
is subject of research for many years, however satisfactory
accuracy of numerical models has not been
achieved yet. Therefore, it is necessary to examine this
phenomenon. For this purpose, special testing equipment
was built at Faculty of Civil Engineering in Ostrava
and series of experimental tests were performed.
One of the tested slabs was chosen and its numerical
model was created in computational program Ansys
18.0. Numerical model consists of two parts - slab and
soil, connected with a contact element. From the test
and the model data, maximal deformations and deformations
trough the cross section of the slab were compared.
This paper examines whether the Hooke’s law
is valid and can be used to express the test behavior
and locate elastic effect area allowing linear modelling
which can be useful for lowering computational time
Benchmark Analysis of Representative Deep Neural Network Architectures
This work presents an in-depth analysis of the majority of the deep neural
networks (DNNs) proposed in the state of the art for image recognition. For
each DNN multiple performance indices are observed, such as recognition
accuracy, model complexity, computational complexity, memory usage, and
inference time. The behavior of such performance indices and some combinations
of them are analyzed and discussed. To measure the indices we experiment the
use of DNNs on two different computer architectures, a workstation equipped
with a NVIDIA Titan X Pascal and an embedded system based on a NVIDIA Jetson
TX1 board. This experimentation allows a direct comparison between DNNs running
on machines with very different computational capacity. This study is useful
for researchers to have a complete view of what solutions have been explored so
far and in which research directions are worth exploring in the future; and for
practitioners to select the DNN architecture(s) that better fit the resource
constraints of practical deployments and applications. To complete this work,
all the DNNs, as well as the software used for the analysis, are available
online.Comment: Will appear in IEEE Acces
Embedding approach to modeling electromagnetic fields in a complex two-dimensional environment
An approach is presented to combine the response of a two-dimensionally inhomogeneous dielectric object in a homogeneous environment with that of an empty inhomogeneous environment. This allows an efficient computation of the scattering behavior of the dielectric cylinder with the aid of the CGFFT method and a dedicated extrapolation procedure. Since a circular observation contour is adopted, an angular spectral representation can be employed for the embedding. Implementation details are discussed for the case of a closed 434 MHz microwave scanner, and the accuracy and efficiency of all steps in the numerical procedure are investigated. Guidelines are proposed for choosing computational parameters such as truncation limits and tolerances. We show that the embedding approach does not increase the CPU time with respect to the forward problem solution in a homogeneous environment, if only the fields on the observation contour are computed, and that it leads to a relatively small increase when the fields on the mesh are computed as well
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