A novel, transfer-function solution of the Kalman-Bucy time-invariant filtering problem is presented. It is assumed that both message model and noise intensities are time invariant and that the mixture of message and noise has been observed over an infinite interval. This transfer-function approach is based on matrix fractions and spectral factorization of polynomial matrices. It offers an inte...

In this paper we propose a very efficient (string) OT 1 n scheme for any n ≥ 2. We build our OT 1 n scheme from fundamental cryptographic techniques directly. It achieves optimal efficiency in the number of rounds and the total number of exchanged messages for the case that the receiver’s choice is unconditionally secure. The computation time of our

Granger causality (GC) is one of the most popular measures to reveal causality influence of time series based on the estimated linear regression model and has been widely applied in economics and neuroscience due to its simplicity, understandability and easy implementation. Especially, its counterpart in frequency domain, spectral GC, has recently received growing attention to study causal inte...

In this paper we introduce the notion of a discrete-time negative imaginary system and we investigate its relations with discrete-time positive real system theory. In the framework presented here, discrete-time negative imaginary systems are defined in terms of a sign condition that must be satisfied in a domain of analyticity of the transfer function, in analogy with the case of discrete-time ...

In the first twenty years of its existence, the Internet was mainly used for email and file transfer, mostly by researchers and technical staff in American universities, government and some industrial research labs. In the last five years, this has changed dramatically, with exponential growth, new services and a transition to a commercial network. This paper describes some of the technical fou...

An intrinsic definition of the index for implicit linear time-varying differential systems is proposed. This definition relies on linear algebraic techniques over the noncommutative principal ideal ring of non-constant linear differential operators (noncommutative transfer function or state-variable representation). Accordance with the existing definition for constant coefficient linear systems...

An empirical method of non-destructive testing of a material was developed using pulse transmission by acoustic emission transducers to determine plastic deformation of 304 stainless steel specimens. This was done by means of comparison of pulse signals detected in an undeformed section with the pulse signals detected after passing through the deformation zone in the specimens. The pulse signal...

The proper usage and creation of transfer functions for time-varying data sets is an often ignored problem in volume visualization. Although methods and guidelines exist for time-invariant data, little formal study for the timevarying case has been performed. This paper examines this problem, and reports the study that we have conducted to determine how the dynamic behavior of time-varying data...

We derive some statistical properties for equilibrium states of partially hyperbolic horseshoes. We define a projection map associated to the horseshoe and prove a spectral gap for its transfer operator acting on the space of Hölder continuous observables. From this we deduce an exponential decay of correlations and a central limit theorem. We finally extend these results to the horseshoe.

The literature analysis of propagation models has investigated different statistical prediction methods to identify appropriate techniques for this purpose. This article presents the results of propagation channel modeling, based on multivariate time series models using data collected in measurement campaigns and the main characteristics of urbanization in the city of Belém-PA. Transfer functio...