123 research outputs found
Geometric Quantization on a Coset Space G/H
Geometric quantization on a coset space is considered, intending to
recover Mackey's inequivalent quantizations. It is found that the inequivalent
quantizations can be obtained by adopting the symplectic 2-form which leads to
Wong's equation. The irreducible representations of which label the
inequivalent quantizations arise from Weil's theorem, which ensures a Hermitian
bundle over to exist.Comment: 12 pages, LateX2
Application of Data Mining Techniques to the Data Analyses to Ensure Safety of Medicine Usage
Single-epoch supernova classification with deep convolutional neural networks
Supernovae Type-Ia (SNeIa) play a significant role in exploring the history
of the expansion of the Universe, since they are the best-known standard
candles with which we can accurately measure the distance to the objects.
Finding large samples of SNeIa and investigating their detailed characteristics
have become an important issue in cosmology and astronomy. Existing methods
relied on a photometric approach that first measures the luminance of supernova
candidates precisely and then fits the results to a parametric function of
temporal changes in luminance. However, it inevitably requires multi-epoch
observations and complex luminance measurements. In this work, we present a
novel method for classifying SNeIa simply from single-epoch observation images
without any complex measurements, by effectively integrating the
state-of-the-art computer vision methodology into the standard photometric
approach. Our method first builds a convolutional neural network for estimating
the luminance of supernovae from telescope images, and then constructs another
neural network for the classification, where the estimated luminance and
observation dates are used as features for classification. Both of the neural
networks are integrated into a single deep neural network to classify SNeIa
directly from observation images. Experimental results show the effectiveness
of the proposed method and reveal classification performance comparable to
existing photometric methods with multi-epoch observations.Comment: 7 pages, published as a workshop paper in ICDCS2017, in June 201
A New Insight into Electron Acceleration Properties from Theoretical Modeling of Double-Peaked Radio Light Curves in Core-Collapse Supernovae
It is recognized that some core-collapse supernovae (SNe) show a
double-peaked radio light curve within a few years since the explosion. A shell
of circumstellar medium (CSM) detached from the SN progenitor has been
considered to play a viable role in characterizing such a re-brightening of
radio emission. Here, we propose another mechanism that can give rise to the
double-peaked radio light curve in core-collapse SNe. The key ingredient in the
present work is to expand the model for the evolution of the synchrotron
spectral energy distribution (SED) to a generic form, including fast and slow
cooling regimes, as guided by the widely-accepted modeling scheme of gamma-ray
burst afterglows. We show that even without introducing an additional CSM
shell, the radio light curve would show a double-peaked morphology when the
system becomes optically thin to synchrotron self-absorption at the
observational frequency during the fast cooling regime. We can observe this
double-peaked feature if the transition from fast cooling to slow cooling
regime occurs during the typical observational timescale of SNe. This situation
is realized when the minimum Lorentz factor of injected electrons is initially
large enough for the non-thermal electrons' SED to be discrete from the thermal
distribution. We propose SN 2007bg as a special case of double-peaked radio SNe
that can be explained by the presented scenario. Our model can serve as a
potential diagnostic for electron acceleration properties in SNe.Comment: 16 pages, 8 figures, submitted to Ap
Nonlocally-correlated disorder and delocalization in one dimension II: Localization length
In the previous paper (cond-mat/9809323), we calculated the density of staes
in the random-mass Dirac fermion system. In this paper, we obtain the mean
localization length of the single-fermion Greem's function by using the
supersymmetric methods. It is shown that the localization length is a
increasing function of the correation length of the disorders. This result is
in agreement with the density of states and the numerical studies
(cond-mat/9903389).Comment: Latex, 25 page
A pilot trial of an online guided self-help cognitive behavioral therapy program for bulimia nervosa and binge eating disorder in Japanese patients
BackgroundThe purpose of this study was to develop an internet-based Guided Self-Help CBT (iGSH-CBT) for Bulimia Nervosa (BN) / Binge Eating Disorder (BED) for Japanese patients and to test its feasibility.MethodsA single-arm feasibility study. After baseline assessment, patients underwent a 16-week iGSH-CBT program, our Japanese adaption of the European-based Salut BN program. During the treatment period, weekly email support from trained counselors was provided. Evaluations were performed at baseline, after 8 weeks, at the end of the 16-week intervention, and at 2 months after treatment had ended. The primary outcome measure was the change in the weekly frequency of objective binging. Secondary outcomes were the change in the weekly frequency of objective purge episodes, responses on self-report questionnaires of the frequencies of binging and purging, psychopathological characteristics of eating disorders found on BITE, EDE-Q, EDI-2, HADS and EQ-5D, measurements of motivation, and completion of intervention (vs. dropout).ResultsParticipants were 9 female outpatients with BN (n = 5) or BED (n = 4), of whom 8 (88.9%) attended the assessment at the end of the 16-week intervention. Mean age was 28 years (SD = 7.9). Percent change of the weekly frequency of objective binging was -4.40%, and at the end of the 16-week intervention 25% of the participants had achieved symptom abstinence.ConclusionsNo adverse events were observed during the treatment period and follow-up, and the implementation and operation of the program could be performed without any major problems, confirming the feasibility of iGSH-CBT for BN and BED for Japanese patients. Although no significant change was observed in the weekly frequency of objective binging, the abstinence rate from bulimic behaviors of those who completed the assessments was 25.0% at the end of treatment, and the drop-out rate was 11.1%. iGSH-CBT may be an acceptable and possibly even a preferred method of CBT delivery for Japanese patients with BN or BED, and our Japanese adaptation of Salut BN seems feasible.Trial registrationUMIN, UMIN000031962. Registered 1 April 2018 - Retrospectively registered, https://center6.umin.ac.jp/cgi-open-bin/ctr/ctr_view.cgi?recptno=R00003633
Localized and Extended States in One-Dimensional Disordered System: Random-Mass Dirac Fermions
System of Dirac fermions with random-varying mass is studied in detail. We
reformulate the system by transfer-matrix formalism.
Eigenvalues and wave functions are obtained numerically for various
configurations of random telegraphic mass m(x).
Localized and extended states are identified. For quasi-periodic m(x),
low-energy wave functions are also quasi-periodic and extended, though we are
not imposing the periodic boundary condition on wave function. On increasing
the randomness of the varying mass, states lose periodicity and most of them
tend to localize. At the band center or the low-energy limit, there exist
extended states which have more than one peak spatially separate with each
other comparatively large distance.
Numerical calculations of the density of states and ensemble averaged Green's
functions are explicitly given. They are in good agreement with analytical
calculations by using the supersymmetric methods and exact form of the
zero-energy wave functions.Comment: 27 pages, including 8 EPS figure
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