نتایج جستجو برای: characteristic function moments

تعداد نتایج: 1390191  

2008
Sheng Tang Jintao Li Ming Li Cheng Xie Yizhi Liu Kun Tao Shao-Xi Xu

For TRECVID 2008 concept detection task, we principally focus on: (1) Early fusion of texture, edge and color features TECM, abbreviation of the combined TF*IDF weights based on SIFT features, Edge Histogram, and Color Moments. (2) To improve the training efficiency and explore the knowledge between concepts or hidden sub-domains more easily and efficiently, we propose a novel method based on L...

Journal: :Siam Journal on Applied Mathematics 2022

A tractable solution is proposed to a classical problem in kinetic theory, namely, given any set of realizable velocity moments up order $2n$, closure for the moment $2n+1$ constructed which system found from free-transport term one-dimensional (1-D) equation globally hyperbolic and conservative form. In prior work, quadrature method (HyQMOM) was introduced close this fourth ($n \le 2$). Here, ...

2012
G. Larry Bretthorst

The problem of density estimation occurs in many disciplines. For example, in MRI it is often necessary to classify the types of tissues in an image. To perform this classification one must first identify the characteristics of the tissues to be classified. These characteristics might be the intensity of a T1 weighted image and in MRI many other types of characteristic weightings (classifiers) ...

Journal: :Physical review 2023

We study electron correlations and their impact on magnetic properties of bcc vanadium by a combination density functional dynamical mean-field theory. The calculated uniform susceptibility in structure is Pauli type at low temperatures, while it obeys the Curie-Weiss law higher temperatures. Thus, we qualitatively reproduce experimental temperature dependence without introducing martensitic ph...

Journal: :Physical review 2021

We consider a particle transport process in one-dimensional system with thin membrane, described by normal diffusion equation. two boundary conditions at the membrane that are linear combinations of integral operators, time dependent kernels, which act on functions and their spatial derivatives define both surfaces. show how change temporal evolution first second moments position distribution (...

2001
George J. Jiang John L. Knight

In this paper we consider the estimation of Markov models where the transition density is unknown. The approach we propose is the empirical characteristic function (ECF) estimation procedure with an approximate optimal weight function. The approximate optimal weight function is obtained through an Edgeworth/Gram-Charlier expansion of the logarithmic transition density of the Markov process. Bas...

2009
Charles R. Keeton

Mass clumps in gravitational lens galaxies can perturb lensed images in characteristic ways. Strong lens flux ratios have been used to constrain the amount of dark matter substructure in lens galaxies, and various other observables have been considered as additional probes of substructure. We study the general theory of lensing with stochastic substructure in order to understand how lensing obs...

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