scholarly journals Fast, high-order, high-frequency "accurate fourier methods" for scattering problems

2005 ◽  
Author(s):  
O.P. Bruno
Keyword(s):  
High Frequency ◽  
High Order ◽  
Scattering Problems ◽  
Fourier Methods

scholarly journals High-order high-frequency solutions of rough surface scattering problems

Radio Science ◽  
2002 ◽  
Vol 37 (4) ◽  
pp. 2-1-2-13 ◽  
Author(s):  
Oscar P. Bruno ◽  
Alain Sei ◽  
Maria Caponi
Keyword(s):  
Rough Surface ◽  
High Frequency ◽  
High Order ◽  
Surface Scattering ◽  
Rough Surface Scattering ◽  
Scattering Problems

Dynamic financial economic fluctuation model based on non-normal distribution

2020 ◽  
pp. 1-10
Author(s):  
Li Wang
Keyword(s):  
Normal Distribution ◽  
High Frequency ◽  
Extreme Value ◽  
High Order ◽  
High Frequency Data ◽  
Order Moment ◽  
Frequency Data ◽  
High Order Moment ◽  
Model Based ◽  
Skewness And Kurtosis

This paper discusses the modeling of financial volatility under the condition of non-normal distribution. In order to solve the problem that the traditional central moment cannot estimate the thick-tailed distribution, the L-moment which is widely used in the hydrological field is introduced, and the autoregressive conditional moment model is used for static and dynamic fitting based on the generalized Pareto distribution. In order to solve the dimension disaster of multidimensional conditional skewness and kurtosis modeling, the multidimensional skewness and kurtosis model based on distribution is established, and the high-order moment model is deduced. Finally, the problems existing in the traditional investment portfolio are discussed, and on this basis, the high-order moment portfolio is further studied. The results show that the key lies in the selection of the model and the assumption of asset probability distribution. Financial risk analysis can be effective only with a large sample. High-frequency data contain more information and can provide rich data resources. The conditional generalized extreme value distribution can well describe the time-varying characteristics of scale parameters and shape parameters and capture the conditional heteroscedasticity in the high-frequency extreme value time series. Better describe the persistence and aggregation of the extreme value of high frequency data as well as the peak and thick tail characteristics of its distribution.

scholarly journals Local solutions to high-frequency 2D scattering problems

2010 ◽  
Vol 229 (14) ◽  
pp. 5357-5372 ◽  
Author(s):  
Andreas Asheim ◽  
Daan Huybrechs
Keyword(s):  
High Frequency ◽  
Scattering Problems ◽  
Local Solutions
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