231 research outputs found
The inverse problem within free Electrodynamics and the coisotropic embedding theorem
We present the coisotropic embedding theorem as a tool to provide a solution
for the inverse problem of the calculus of variations for a particular class of
implicit differential equations, namely the equations of motion of free
Electrodynamics
From Point Particles to Gauge Field Theories: a Differential- Geometrical approach to the Structures of the Space of Solutions
Mención Internacional en el tÃtulo de doctorPrograma de Doctorado en IngenierÃa Matemática por la Universidad Carlos III de MadridPresidenta: Eva Miranda.- Secretaria: MarÃa Carmela Lombardo.- Vocales: Alberto Calabri.- Marco Castrillón López.- Fernando Falceto Blecua.- Katarzyna Grabowska.- MarÃa Edith Padrón Fernández.- Narciso Román Ro
XNOR Neural Engine: a Hardware Accelerator IP for 21.6 fJ/op Binary Neural Network Inference
Binary Neural Networks (BNNs) are promising to deliver accuracy comparable to
conventional deep neural networks at a fraction of the cost in terms of memory
and energy. In this paper, we introduce the XNOR Neural Engine (XNE), a fully
digital configurable hardware accelerator IP for BNNs, integrated within a
microcontroller unit (MCU) equipped with an autonomous I/O subsystem and hybrid
SRAM / standard cell memory. The XNE is able to fully compute convolutional and
dense layers in autonomy or in cooperation with the core in the MCU to realize
more complex behaviors. We show post-synthesis results in 65nm and 22nm
technology for the XNE IP and post-layout results in 22nm for the full MCU
indicating that this system can drop the energy cost per binary operation to
21.6fJ per operation at 0.4V, and at the same time is flexible and performant
enough to execute state-of-the-art BNN topologies such as ResNet-34 in less
than 2.2mJ per frame at 8.9 fps.Comment: 11 pages, 8 figures, 2 tables, 3 listings. Accepted for presentation
at CODES'18 and for publication in IEEE Transactions on Computer-Aided Design
of Circuits and Systems (TCAD) as part of the ESWEEK-TCAD special issu
STRATEGIC AND VIRTUAL NETWORKS – A POSSIBLE INTEGRATION
One of the best known features of the Italian entrepreneurial system is undoubtedly the industrial district, a network of small and medium size enterprises; the object of this survey is to study the integration between the strategic network, identified by the relationship between the companies in a district, and the virtual Internet network.Industrial Districts; Net Economy; Shoes Maker Industry
Geometry from divergence functions and complex structures
Motivated by the geometrical structures of quantum mechanics, we introduce an
almost-complex structure on the product of any parallelizable
statistical manifold . Then, we use to extract a pre-symplectic form and
a metric-like tensor on from a divergence function. These tensors
may be pulled back to , and we compute them in the case of an N-dimensional
symplex with respect to the Kullback-Leibler relative entropy, and in the case
of (a suitable unfolding space of) the manifold of faithful density operators
with respect to the von Neumann-Umegaki relative entropy.Comment: 19 pages, comments are welcome
Covariant Variational Evolution and Jacobi Brackets: Fields
The analysis of the covariant brackets on the space of functions on the
solutions to a variational problem in the framework of contact geometry
initiated in the companion letter Ref.19 is extended to the case of the
multisymplectic formulation of the free Klein-Gordon theory and of the free
Schr\"{o}dinger equation.Comment: 16 page
Fast and Accurate Multiclass Inference for MI-BCIs Using Large Multiscale Temporal and Spectral Features
Accurate, fast, and reliable multiclass classification of
electroencephalography (EEG) signals is a challenging task towards the
development of motor imagery brain-computer interface (MI-BCI) systems. We
propose enhancements to different feature extractors, along with a support
vector machine (SVM) classifier, to simultaneously improve classification
accuracy and execution time during training and testing. We focus on the
well-known common spatial pattern (CSP) and Riemannian covariance methods, and
significantly extend these two feature extractors to multiscale temporal and
spectral cases. The multiscale CSP features achieve 73.7015.90% (mean
standard deviation across 9 subjects) classification accuracy that surpasses
the state-of-the-art method [1], 70.614.70%, on the 4-class BCI
competition IV-2a dataset. The Riemannian covariance features outperform the
CSP by achieving 74.2715.5% accuracy and executing 9x faster in training
and 4x faster in testing. Using more temporal windows for Riemannian features
results in 75.4712.8% accuracy with 1.6x faster testing than CSP.Comment: Published as a conference paper at the IEEE European Signal
Processing Conference (EUSIPCO), 201
Lagrangian description of Heisenberg and Landau-von Neumann equations of motion
An explicit Lagrangian description is given for the Heisenberg equation on
the algebra of operators of a quantum system, and for the Landau-von Neumann
equation on the manifold of quantum states which are isospectral with respect
to a fixed reference quantum state.Comment: 13 page
Recent developments in the spectral theory for non self-adjoint Hamiltonians
The objective of this survey is to collect and elaborate on different tools, both well-established and more recent ones, which have been developed in the last decades to investigate spectral properties of non-self-adjoint operators of the form . More specifically, we will show how Hardy-type and Sobolev inequalities, together with Virial theorems and Birman-Schwinger principles enter into play in the analysis of the spectrum of these Hamiltonians
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