This paper presents a multi-objective Particle Swarm Optimization (PSO) algorithm for worker assignment and mixed-model assembly line balancing problem when task times depend on the worker’s skill level. The objectives of this model are minimization of the number of stations (equivalent to the maximization of the weighted line efficiency), minimization of the weighted smoothness index and minim...

Consolidation of motor skills after training can occur in a time- or sleep-dependent fashion. Recent studies revealed time-dependent consolidation as a common feature of visuomotor tasks. We have previously shown that anodal transcranial direct current stimulation (tDCS) in combination with repeated motor training benefits consolidation by the induction of offline skill gains in a complex visuo...

We explore the problem of assigning heterogeneous tasks to workers with different, unknown skill sets in crowdsourcing markets such as Amazon Mechanical Turk. We first formalize the online task assignment problem, in which a requester has a fixed set of tasks and a budget that specifies how many times he would like each task completed. Workers arrive one at a time (with the same worker potentia...

The main purpose of the present quasi-experimental study was twofold; its first purpose was to investigate the effects of using of two approaches namely; genre and process on EFL learners’ accuracy, fluency, and complexity in written task production. Secondly, it attempted to investigate the effects of mentioned approaches on EFL learners’ attitude toward writing skill. to this end, 60 learners...

A central organizing framework of the voluminous recent literature studying changes in the returns to skills and the evolution of earnings inequality iswhatwe refer to as the canonicalmodel, which elegantly and powerfully operationalizes the supply and demand for skills by assuming two distinct skill groups that perform twodifferent and imperfectly substitutable tasks or produce two imperfectly...