These devices allow the performing of movements that cannot be carried out by persons with amputated limbs. The state of the art in the development of MCSs is based on the use of individual principal component analysis (iPCA) as a stage of pre-processing of the classifiers. The iPCA pre-processing implies an optimization stage which has not yet been deeply explored.\n\nMethods: The present study considers two factors in the iPCA stage: namely A (the fitness function), and B (the search algorithm). The A factor comprises two levels, namely A(1) (the classification error) and A(2) (the correlation factor). Otherwise, the B factor has four levels, specifically
B-1 (the Sequential Forward Selection, SFS), B-2 (the Sequential Floating Forward Selection, SFFS), B-3 (Artificial see more Bee Colony, ABC), and B-4 (Particle Swarm Optimization, PSO). This work evaluates the incidence of each one of the eight possible combinations between A and B factors over the classification error of the MCS.\n\nResults: A two factor ANOVA was performed on the computed classification errors and determined that: (1) the interactive effects over the classification error are not significative (F-0.01,F-3,F-72 = 4.0659 > f(AB) = 0.09), (2) the levels of factor A have
significative effects on the classification error (F-0.02,F-1,F-72 GSK1120212 order = 5.0162 < f(A) = 6.56), and (3) the levels of factor B over the classification error are not significative (F-0.01,F-3,F-72 learn more = 4.0659 > f(B) = 0.08).\n\nConclusions: Considering the classification performance we found a superiority of using the factor A(2) in combination with any of the levels of factor B. With respect to the time performance the analysis suggests that the PSO algorithm is at least 14 percent better than its best competitor. The latter behavior has been observed for a particular configuration
set of parameters in the search algorithms. Future works will investigate the effect of these parameters in the classification performance, such as length of the reduced size vector, number of particles and bees used during optimal search, the cognitive parameters in the PSO algorithm as well as the limit of cycles to improve a solution in the ABC algorithm.”
“This paper presents a child swing 4 motion modelled as the variable length of pendulum without damping effect. We have discussed the mathematical model of child swing motion and numerical simulation by using multiple scales method. It is shown that the physical behavior of child swing motion has resemblance with the physical nature of harmonic motion of simple pendulum, for the value of angular frequency less than and equal to two of child swing motion. MATLAB 7.0 is used for phase plane analysis in justification of theoretical results.”
“Purpose: The process of breast cancer follow-up has psychosocial benefits for patients, notably reassurance, although attending hospital appointments can increase anxiety.