3,785 research outputs found
Generalized Shannon-Khinchin Axioms and Uniqueness Theorem for Pseudo-additive Entropies
We consider the Shannon-Khinchin axiomatic systems for the characterization
of generalized entropies such as Sharma-Mital and Frank-Daffertshofer entropy.
We provide the generalization of Shannon-Khinchin axioms and give the
corresponding uniqueness theorem. The previous attempts at such axiomatizations
are also discussed
A unified characterization of generalized information and certainty measures
In this paper we consider the axiomatic characterization of information and
certainty measures in a unified way. We present the general axiomatic system
which captures the common properties of a large number of the measures
previously considered by numerous authors. We provide the corresponding
characterization theorems and define a new generalized measure called the
Inforcer, which is the quasi-linear mean of the function associated to the
event probability following the general composition law. In particular, we pay
attention to the polynomial composition and the corresponding polynomially
composable Inforcer measure. The most common measures appearing in literature
can be obtained by specific choice of parameters appearing in our generic
measures and they are listed in tables
An axiomatic characterization of generalized entropies under analyticity condition
We present the characterization of the Nath, R\'enyi and
Havrda-Charv\'at-Tsallis entropies under the assumption that they are analytic
function with respect to the distribution dimension, unlike the the previous
characterizations, which supposes that they are expandable maximized for
uniform distribution
On the weighted reverse order laws for the Moore-Penrose inverse and K-inverses
The main objective of this article is to study several generalizations of the
reverse order law for the Moore-Penrose inverse in ring with involution.Comment: 13 pages, original research articl
Comments on "A two-parameter generalization of Shannon-Khinchin Axioms and the uniqueness theorem"
Wada and Suyari proposed a two-parameter generalization of Shannon-Khinchin
axioms (TGSK axioms) [T. Wada and H. Suyari, Physics Letters A, 368(3)]. We
derive a new class of entropies which differs from Wada-Suyari's class by
fixing the incorrectness which occurs in the mentioned paper. Also, we consider
a two-parameter class of entropies derived from the maxent principle proposed
in [Kaniadakis, G. and Lissia, M. and Scarfone, AM, Physica A: Statistical
Mechanics and its Applications, 340(1)]. We rederived this class by changing
initial condition, obtaining the same class as our class derived from TGSK
axioms.Comment: 4 page
Entropy Message Passing
The paper proposes a new message passing algorithm for cycle-free factor
graphs. The proposed "entropy message passing" (EMP) algorithm may be viewed as
sum-product message passing over the entropy semiring, which has previously
appeared in automata theory. The primary use of EMP is to compute the entropy
of a model. However, EMP can also be used to compute expressions that appear in
expectation maximization and in gradient descent algorithms.Comment: 5 pages, 1 figure, to appear in IEEE Transactions on Information
Theor
Cross-correlation between the cosmic microwave and infrared backgrounds for integrated Sachs-Wolfe detection
We investigate the cross-correlation between the cosmic infrared background
(CIB) and cosmic microwave background (CMB) anisotropies due to the integrated
Sachs-Wolfe (ISW) effect. We first describe the CIB anisotropies using a
linearly biased power spectrum, valid on the angular scales of interest. From
this, we derive the theoretical angular power spectrum of the CMB-CIB
cross-correlation for different instruments and frequencies. Our cross-spectra
show similarities in shape with usual CMB/galaxies cross-correlations. We
discuss the detectability of the ISW signal by performing a signal-to-noise
(SNR) analysis with our predicted spectra. Our results show that : (i) in the
ideal case of noiseless, full-sky maps, the significances obtained range from 6
to 7 sigmas depending on the frequency, with a maximum at 353 GHz (ii) in
realistic cases which account for the presence of noise including astrophysical
contaminents, the results depend strongly on the major contribution to the
noise term. They span from 2 to 5 sigmas, the most favorable frequency for
detection being 545 GHz. We also find that the joint use of all available
frequencies in the cross-correlation does not improve significantly the total
SNR, due to the high level of correlation of the CIB maps at different
frequencies.Comment: 10 pages, 6 figures, 1 table ; small changes to match the version
published in MNRA
Gradient Computation In Linear-Chain Conditional Random Fields Using The Entropy Message Passing Algorithm
The paper proposes a numerically stable recursive algorithm for the exact
computation of the linear-chain conditional random field gradient. It operates
as a forward algorithm over the log-domain expectation semiring and has the
purpose of enhancing memory efficiency when applied to long observation
sequences. Unlike the traditional algorithm based on the forward-backward
recursions, the memory complexity of our algorithm does not depend on the
sequence length. The experiments on real data show that it can be useful for
the problems which deal with long sequences.Comment: 11 pages, 2 tables, 3 figures, 2 algorithm
Vortex configurations, matching, and domain structure in large arrays of artificial pinning centers
High-resolution scanning Hall probe microscopy has been used to image vortex
configurations in very large periodic arrays of artificial pinning sites.
Strong matching effects are seen at fields where either one or two vortices can
sit at a site; with three vortices per site, however, no clear matching is
observed. Matching effects have been also been observed at several fractional
multiples of the matching field, including 1/5, 1/4, 1/3, 1/2, and 3/4. These
fractional values are characterized by striking domain structure and grain
boundaries.Comment: 4 pages, 5 figure
On kurtosis and extreme waves in crossing directional seas:A laboratory experiment
We examine the statistical properties of extreme and rogue wave activity in crossing directional seas, to constrain the probabilistic distributions of wave heights and wave crests in complex sea states; such crossing seas alter the statistical structure of surface waves and are known to have been involved in several marine accidents. Further, we examine the relationship between the kurtosis as an indicator of nonlinearity in the spectrum and the directionality and crossing angles of the sea-state components. Experimental tests of two-component directionally spread irregular waves with varying frequency, directional spreading and component crossing angles were carried out at the Ocean Basin Laboratory in Trondheim, Norway. The results from the experiments show that wave heights are well described by a first-order (linear) statistical distribution, while for the wave crest heights several cases exceed a second-order distribution. The number of rogue waves is relatively low overall, which agrees with previous findings in directionally spread seas. The kurtosis and wave and crest height exceedance probabilities were more affected by varying the directional spreading of the components than by varying the crossing angles between components; reducing the component directional spreading increases the kurtosis and increases the exceedance probabilities. The kurtosis can be estimated quite well for two-component seas from the directional spreading using an empirical relationship based on the two-dimensional Benjamin–Feir index when the effects of bound modes are included. This result may allow forecasting of the probability of extreme waves from the directional spreading in complex sea states
- …