Manufacturing systems are often characterized by a stochastic and uncertain behavior in which frequent changes and unpredictable events may occur over time. In order to cope with such changes in the manufacturing system state, and to optimize given performance criteria, the assignment of workers to machines can be decided online, in a dynamic manner, whenever workers become available. Several studies, in the ergonomics literature, have outlined that the operators' performances often decline because of their fatigue in work.

Iron-Nickel nanoparticles (Fe-Ni NPs) were successfully synthesized in various stoichiometry from the inverse micelle method followed by combustion at 500oC for 12 h in H2. Ni-rich Fe-Ni NPs crystallize in face centered cubic (fcc) structure while Fe-rich Fe-Ni NPs stabilize in body centered cubic (bcc) structure.