Results 151 to 160 of about 56,906 (164)
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Non-stationarity and non-Gaussianity in Vibration Fatigue
2019In vibration fatigue the frequency contents of dynamic loading and structure’s dynamic response overlap, resulting in amplified stress loads of the structure. Time domain fatigue approach does not give a good insight into the underlying mechanics of failure and therefore recently vibration fatigue in frequency domain is getting a lot of scientific ...
Slavič, Janko +5 more
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Multivariate design in the presence of non-stationarity
Journal of Hydrology, 2014Summary Over the last decade the number of applications of copula functions for multidimensional modeling of hydrological parameters has significantly increased. However, most of the studies assume stationarity in the marginal distribution parameters as well as in the dependence structure of the variables.
Thomas Wahl +3 more
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(Non)stationarity of temporal dynamics in fMRI
Proceedings of the First Joint BMES/EMBS Conference. 1999 IEEE Engineering in Medicine and Biology 21st Annual Conference and the 1999 Annual Fall Meeting of the Biomedical Engineering Society (Cat. No.99CH37015), 2003Estimation of the temporal information encoded in the observed hemodynamic response in functional MRI (fMRI) is of great interest. One assumption that most of the current studies make is that the mean waveform observed is consistently locked with the stimulus and variably distributed about its mean.
Godfrey D. Pearlson +2 more
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Non-stationarity Tests in Macroeconomic Time Series
2005This paper presents a selective survey of the literature on non-stationarity tests, namely standard and efficient unit root tests and stationarity tests, with or without structural changes. We also present the direct relation between non-stationarity tests and four economic theories, such as business cycles, hysteresis, purchasing power parity and ...
Darné, Olivier, Diebolt, Claude
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Financial Risk Forecasting with Non-Stationarity
2011One important feature in all financial markets is that they are nonlinear dynamical systems (Brock 1986; Scheinkman and LeBaron 1989; Hsieh 1989; Brock et al. 1996). Under this framework, it is assumed that asset price changes may not be solely due to new information, as simply described by the random walk model, but are also governed by some ...
Michael C. S. Wong, Humphrey K. K. Tung
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A Test for Non-Stationarity of Synchrophasor Measurements
2018 IEEE International Conference on Probabilistic Methods Applied to Power Systems (PMAPS), 2018Synchrophasor measurements are becoming more widely used in control centers. These measurements under ambient power system conditions are frequently modeled as stochastic processes. Statistical stationarity, an assumption made for mathematical expediency of signal processing tools, is almost never completely satisfied in practice.
John W. Pierret, Md. Arif Khan
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Non-Stationarity and Local Spatial Analysis
2020Most standard spatial analyses assume stationarity, i.e. that the generative process producing the observed pattern is spatially homogenous, and hence its features are independent of absolute spatial locations. Under this assumption, if we wish to describe the distribution of a settlement pattern as a point process, we consider the degree of clustering
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Multimodal imaging, non-stationarity and BCI
2014 International Winter Workshop on Brain-Computer Interface (BCI), 2014Learning to build universal decoders for BCI is a great challenge (see [9], [2], [8] for recent reviews on Machine Learning for BCI). Usually in multimodal imaging we consider the modes to be different types of imaging devices such as EEG, NIRS or fMRI (see e.g. [1], [7], [3], [4]).
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Quasi-perpendicular shocks non stationarity and micro-turbulence
2011 XXXth URSI General Assembly and Scientific Symposium, 2011A very important issue of a high Mach number quasi-perpendicular shock is its nonstationary character and several mechanisms issued from simulation and theoretical studies have been proposed to account for it. For instance, one process — the so-called self-reformation — driven by the accumulation of reflected ions at a foot distance from the ramp has ...
Mazelle, C. +2 more
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Accounting for Non-stationarity in Demand Systems
1992In the mid-1960s Barten (1964) and Theil (1965) developed the first widely-recognized demand system, the so-called Rotterdam model, that was sufficiently general to permit the testing of homogeneity and symmetry. Later that decade, Theil (1969) introduced ‘The Multinomial Extension of the Linear Logit Model’ and manipulated it to show its connection ...
Graham Elliott, Ronald Bewley
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