3,478 research outputs found
Semi-Supervised Deep Learning for Fully Convolutional Networks
Deep learning usually requires large amounts of labeled training data, but
annotating data is costly and tedious. The framework of semi-supervised
learning provides the means to use both labeled data and arbitrary amounts of
unlabeled data for training. Recently, semi-supervised deep learning has been
intensively studied for standard CNN architectures. However, Fully
Convolutional Networks (FCNs) set the state-of-the-art for many image
segmentation tasks. To the best of our knowledge, there is no existing
semi-supervised learning method for such FCNs yet. We lift the concept of
auxiliary manifold embedding for semi-supervised learning to FCNs with the help
of Random Feature Embedding. In our experiments on the challenging task of MS
Lesion Segmentation, we leverage the proposed framework for the purpose of
domain adaptation and report substantial improvements over the baseline model.Comment: 9 pages, 6 figure
The Schwinger action principle for classical systems
We use the Schwinger action principle to obtain the correct equations of
motion in the Koopman-von Neumann operational version of classical mechanics.
We restrict our analysis to non-dissipative systems and velocity-independent
forces. We show that the Schwinger action principle can be interpreted as a
variational principle in these special cases
Projective representation of the Galilei group for classical and quantum-classical systems
A physically relevant unitary irreducible non-projective representation of
the Galilei group is possible in the Koopman-von Neumann formulation of
classical mechanics. This classical representation is characterized by the
vanishing of the central charge of the Galilei algebra. This is in contrast to
the quantum case where the mass plays the role of the central charge. Here we
show, by direct construction, that classical mechanics also allows for a
projective representation of the Galilei group where the mass is the central
charge of the algebra. We extend the result to certain kind of
quantum-classical hybrid systems
Recommended from our members
Puerto Rican families with children with special needs in Puerto Rico : parental views about life, family support and services.
The geometric tensor for classical states
We use the Liouville eigenfunctions to define a classical version of the
geometric tensor and study its relationship with the classical adiabatic gauge
potential (AGP). We focus on integrable systems and show that the imaginary
part of the geometric tensor is related to the Hannay curvature. The
singularities of the geometric tensor and the AGP allows us to link the
transition from Arnold-Liouville integrability to chaos with some of the
mathematical formalism of quantum phase transitions
Mesoscopic mean-field theory for spin-boson chains in quantum optical systems
We present a theoretical description of a system of many spins strongly coupled to a bosonic chain. We rely on the use of a spin-wave theory describing the Gaussian fluctuations around the mean-field solution, and focus on spin-boson chains arising as a generalization of the Dicke Hamiltonian. Our model is motivated by experimental setups such as trapped ions, or atoms/qubits coupled to cavity arrays. This situation corresponds to the cooperative (E⊗β) Jahn-Teller distortion studied in solid-state physics. However, the ability to tune the parameters of the model in quantum optical setups opens up a variety of novel intriguing situations. The main focus of this paper is to review the spin-wave theoretical description of this problem as well as to test the validity of mean-field theory. Our main result is that deviations from mean-field effects are determined by the interplay between magnetic order and mesoscopic cooperativity effects, being the latter strongly size-dependent
Numerical simulation of resistance furnaces by using distributed and lumped models
This work proposes a methodology combining distributed and lumped models to
simulate the current distribution in an indirect heat resistance furnace and,
in particular, to compute the current to be supplied in order to obtain a
desired power. The distributed model is a time-harmonic eddy current problem
which has been numerically solved by using a finite element method. The lumped
model is based on the computation of a reduced impedance associated to an
equivalent circuit model. The effectiveness of the method has been assessed by
numerical simulations and plant measurements. The good correlation between the
results reveals this approximation is well-suited in order to aid the design
and improve the efficiency of the furnace in a short-time
Comparación de curvas de supervivencia gamma estocásticamente ordenadas
En este trabajo se propone un análisis de supervivencia basado en un modelo Gamma. Se obtienen las condiciones teóricas bajo las cuales dos funciones de supervivencia Gamma están estocásticamente ordenadas. Estos resultados se utilizan para proponer un método sencillo que permite comparar dos poblaciones cuando, a priori, se conoce que sus curvas de supervivencia están estocásticamente ordenadas. Los resultados se ejemplifican con el análisis de un banco de datos reales sobre tiempos de desempleo
- …