This paper is a pioneering attempt to utilize a Brownian motion (BM) process with drift to model the mobile radio channel under non-stationary conditions. It is assumed that the mobile station (MS) starts moving in a semi-random way, but subject to follow a given direction. This moving scenario is modelled by a BM process with drift (BMD). The starting point of the movement is a fixed point in ...

We prove that the drift θ(d, β) for excited random walk in dimension d is monotone in the excitement parameter β ∈ [0, 1], when d ≥ 9.

Online classification learners operating under concept drift can be subject to latency in examples arriving at the training base. A discussion of latency and the related notion of example filtering leads to the development of an example life cycle for online learning (OLLC). Latency in a data stream is modelled in a new Example Life-cycle Integrated Simulation Environment (ELISE). In a series o...

Phasons are special hydrodynamic modes that occur in quasicrystals. The trajectories of particles due to a phasonic drift were recently studied by Kromer et al. (Phys. Rev. Lett. 108, 218301 (2012)) for the case where the particles stay in the minima of a quasicrystalline potential. Here, we study the mean motion of colloidal particles in quasicrystalline laser fields when a phasonic drift or d...

introduction: wind erosion is one of the most important factors in desert environments. prevailing winds can shift sand dunes and affect their accumulation and morphology. also, wind regime determines the direction of sand dune mobility in different ways. therefore, the wind regime, frequency, direction and velocity are supposed to be the most important factors to form the morphology of sand du...

Finite population size results in random changes in allele frequencies. Lecture 3 briefly introduced genetic drift on a single locus. Here we greatly expand upon these results, building up a neutral theory for both single loci and also for neutral drift in phenotypes. These will serve as null models for tests of selection. Lecture 8 considers using molecular data to look for signatures of selec...

Finite population size results in random changes in allele frequencies. Lecture 3 briefly introduced genetic drift on a single locus. Here we greatly expand upon these results, building up a neutral theory for both single loci and also for neutral drift in phenotypes. These will serve as null models for tests of selection. Lecture 8 considers using molecular data to look for signatures of selec...