Optic Flow (OF) plays an important role in human locomotion and manipulation of OF characteristics can cause changes in locomotion patterns. The purpose of the study was to investigate the effect of the velocity of optic flow on the amount and structure of gait variability. Each subject underwent four conditions of treadmill walking at their self-selected pace. In three conditions the subjects ...

A formal, representation-independent form of a memetic algorithm— a genetic algorithm incorporating local search—is introduced. A generalised form ofN -point crossover is defined together with representation-independent patching and hill-climbing operators. The resulting formal algorithm is then constructed and tested empirically on the travelling sales-rep problem. Whereas the genetic algorith...

Two complementary approaches ofN = 2 fractional supersymmetric quantum mechanics of order k are studied in this article. The first one, based on a generalized Weyl-Heisenberg algebra Wk (that comprizes the affine quantum algebra Uq(sl2) with q k = 1 as a special case), apparently contains solely one bosonic degree of freedom. The second one uses generalized bosonic and kfermionic degrees of fre...

Anumerical semigroup is a subset ofN containing 0, closed under addition and with finite complement in N. An important example of numerical semigroup is given by the Weierstrass semigroup at one point of a curve. In the theory of algebraic geometry codes, Weierstrass semigroups are crucial for defining bounds on the minimum distance as well as for defining improvements on the dimension of codes...

Z. Bern, J. J.M. Carrasco, L. J. Dixon, H. Johansson, and R. Roiban Department of Physics and Astronomy, UCLA, Los Angeles, California 90095-1547, USA SLAC National Accelerator Laboratory, Stanford University, Stanford, California 94309, USA Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA (Received 25 May 2009; published 17 August 2009) We describe...

Expansions of n -butane from small nozzles were observed to generate large clusters, provided that enough helium or neon carrier gas accompanied the butane to remove the heat of condensation rapidly and to produce low temperatures. Although expansions of neat n -butane led to substantial conformational cooling under some circumstances, clusters were never seen without carrier gas. Both thin-pla...

This paper presents a novel procedure for the blind identification of a linear mixture of n sources with 2 sensors. It is shown that the second characteristic function obeys a partial differential equation (PDE) whose coefficients are directly related to the mixture coefficients. A uniqueness result allows the design of an estimation procedure based on this PDE. An algorithm is therefore propos...

This system arises from a model of the nonlinear thermoelastic coupled vibration structure with the clamped ends for simultaneously considering the medium damping, the viscous effect and the nonlinear constitutive relation and thermoelasticity based on a theory of non-Fourier heat flux laws. By considering the case where the internal (structural) damping is present, for 0≤ ι < 1, we show that t...