The Hurst phenomenon and fractional Gaussian noise made easy

The Hurst phenomenon and fractional Gaussian noise made easy

The Hurst phenomenon, which characterizes hydrological and other geophysical time series, is formulated and studied in an easy manner in terms of the variance and autocorrelation of a stochastic process on multiple temporal scales. In addition, a simple explanation of the Hurst phenomenon based on the fluctuation of a hydrological process upon different temporal scales is presented. The stochas...

Modified periodogram method for estimating the Hurst exponent of fractional Gaussian noise.

Fractional Gaussian noise (fGn) is an important and widely used self-similar process, which is mainly parametrized by its Hurst exponent (H) . Many researchers have proposed methods for estimating the Hurst exponent of fGn. In this paper we put forward a modified periodogram method for estimating the Hurst exponent based on a refined approximation of the spectral density function. Generalizing ...

“The A-Word” Made Easy

In 1988, before assessment became the “A-word,” Cross and Angelo produced a short volume containing 30 simple classroom assessment techniques. These were arranged in a practical how-to format that made it easy for college faculty with no background or training in science education to apply assessment in the classroom. It was my introduction to using Minute Papers and Concept Maps to understand ...

Atom Bomb Made Easy

Concurrent Programming Made Easy

The task of programming concurrent systems is substantially more difficult than the task of programming sequential systems with respect to both correctness and efficiency. In this paper we describe a constraint-based methodology for writing concurrent applications. A system is modeled as: (a) a set of processes containing a sequence of “markers” denoting the processes points of interest; and (b...