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Extremes of multidimensional Gaussian processes  [PDF]
Krzysztof D?bicki,Kamil Marcin Kosiński,Michel Mandjes,Tomasz Rolski
Mathematics , 2010, DOI: 10.1016/j.spa.2010.08.010
Abstract: This paper considers extreme values attained by a centered, multidimensional Gaussian process $X(t)= (X_1(t),\ldots,X_n(t))$ minus drift $d(t)=(d_1(t),\ldots,d_n(t))$, on an arbitrary set $T$. Under mild regularity conditions, we establish the asymptotics of \[\log\mathbb P\left(\exists{t\in T}:\bigcap_{i=1}^n\left\{X_i(t)-d_i(t)>q_iu\right\}\right),\] for positive thresholds $q_i>0$, $i=1,\ldots,n$, and $u\to\infty$. Our findings generalize and extend previously known results for the single-dimensional and two-dimensional cases. A number of examples illustrate the theory.
Integral equivalence of multidimensional differential systems  [PDF]
V. N. Gorbuzov
Mathematics , 2009,
Abstract: The bases of the theory of integrals for multidimensional differential systems are stated. The integral equivalence of total differential systems, linear homogeneous systems of partial differential equations, and Pfaff systems of equations is established.
On two new multidimensional integral inequalities of the Hilbert type  [cached]
B. G. Pachpatte
Tamkang Journal of Mathematics , 2000, DOI: 10.5556/j.tkjm.31.2000.123-130
Abstract: The main aim of this paper is to establish two new multidimensional integral inequalities similar to the integral analogue of the well known Hilbert's inequality by using elementary analysis.
A simplified multidimensional integral  [PDF]
ágnes M. Backhausz,Vilmos Komornik,Tivadar Szilágyi
Mathematics , 2007,
Abstract: We present a simplified integral of functions of several variables. Although less general than the Riemann integral, most functions of practical interest are still integrable. On the other hand, the basic integral theorems can be obtained more quickly. We also give a characterization of the integrable functions and their primitives.
On the numerical solution of the multidimensional singular integrals and integral equations, used in the theory of linear viscoelasticity  [cached]
E. G. Ladopoulos
International Journal of Mathematics and Mathematical Sciences , 1988, DOI: 10.1155/s0161171288000675
Abstract: In the present report, we investigate the formulation, for the numerical evaluation of the multidimensional singular integrals and integral equations, used in the theory of linear viscoelasticity. Some simple formulas are given for the numerical solution of the general case of the multidimensional singular integrals. Moreover a numerical technique is also established for the numerical solution of some special cases of the multidimensional singular integrals like the two - and three - dimensional singular integrals. An application is given to the determination of the fracture behaviour of a thick, hollow circular cylinder of viscoelastic material restrained by an enclosing thin elastic ring and subjected to a uniform pressure.
Pathwise stochastic integrals and It? formula for multidimensional Gaussian processes  [PDF]
Zhe Chen,Lauri Viitasaari
Mathematics , 2014,
Abstract: In this article we study existence of pathwise stochastic integrals with respect to a general class of $n$-dimensional Gaussian processes and a wide class of adapted integrands. More precisely, we study integrands which are functions that are of locally bounded variation with respect to all variables. Moreover, multidimensional It\^o formula is derived.
A Multidimensional Analogue of the Simpson's Formula of Integral  [PDF]
Kazuyuki Fujii
Physics , 2009, DOI: 10.1142/S0219887810004294
Abstract: The Simpson's formula is obtained by approximating the integral of a function on some interval by the integral of the quadratic polynomial determined by the function. However, a multidimensional analogue of the formula has not been given as far as we know. In this paper such a formula is given. Our formula is simple and beautiful, so it may be convenient in Mathematics or Mathematical Physics.
GPatt: Fast Multidimensional Pattern Extrapolation with Gaussian Processes  [PDF]
Andrew Gordon Wilson,Elad Gilboa,Arye Nehorai,John P. Cunningham
Computer Science , 2013,
Abstract: Gaussian processes are typically used for smoothing and interpolation on small datasets. We introduce a new Bayesian nonparametric framework -- GPatt -- enabling automatic pattern extrapolation with Gaussian processes on large multidimensional datasets. GPatt unifies and extends highly expressive kernels and fast exact inference techniques. Without human intervention -- no hand crafting of kernel features, and no sophisticated initialisation procedures -- we show that GPatt can solve large scale pattern extrapolation, inpainting, and kernel discovery problems, including a problem with 383400 training points. We find that GPatt significantly outperforms popular alternative scalable Gaussian process methods in speed and accuracy. Moreover, we discover profound differences between each of these methods, suggesting expressive kernels, nonparametric representations, and exact inference are useful for modelling large scale multidimensional patterns.
An effective method to estimate multidimensional Gaussian states  [PDF]
J. Rehacek,S. Olivares,D. Mogilevtsev,Z. Hradil,M. G. A. Paris,S. Fornaro,V. D'Auria,A. Porzio,S. Solimeno
Physics , 2009, DOI: 10.1103/PhysRevA.79.032111
Abstract: A simple and efficient method for characterization of multidimensional Gaussian states is suggested and experimentally demonstrated. Our scheme shows analogies with tomography of finite dimensional quantum states, with the covariance matrix playing the role of the density matrix and homodyne detection providing Stern-Gerlach-like projections. The major difference stems from a different character of relevant noises: while the statistics of Stern-Gerlach-like measurements is governed by binomial statistics, the detection of quadrature variances correspond to chi-square statistics. For Gaussian and near Gaussian states the suggested method provides, compared to standard tomography techniques, more stable and reliable reconstructions. In addition, by putting together reconstruction methods for Gaussian and arbitrary states, we obtain a tool to detect the non-Gaussian character of optical signals.
Multidimensional pain evaluation scale
Sousa, Fátima Aparecida Emm Faleiros;Pereira, Lilian Varanda;Cardoso, Roberta;Hortense, Priscilla;
Revista Latino-Americana de Enfermagem , 2010, DOI: 10.1590/S0104-11692010000100002
Abstract: this study developed a pain evaluation scale and validated it for the portuguese language. development of the inventory - 308 readily available pain descriptors - were searched in international literature and validated by six judges. one hundred descriptors of acute pain and 100 descriptors of chronic pain were found, which were used in the next stage. statistical validation - 493 health professionals and 146 patients experiencing acute and chronic pain participated in the study. instructions, pain descriptors and respective definitions, pen and measuring tape were provided to participants. psychophysical methods were used to establish categories, magnitude and cross-modality matching using line-length. results revealed the ranking of the most frequently used descriptors of acute and chronic pain, with power equal to 0.99, close to the predicted (one), using line-length estimations. the multidimensional pain evaluation scale is thus validated for the portuguese language.
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