In this research, we address the application of uncertaintyprogramming to design a multi-site, multi-product, multi-period,closed-loop supply chain (CLSC) network. In order to make theresults of this article more realistic, a CLSC for a case study inthe iron and steel industry has been explored. The presentedsupply chain covers three objective functions: maximization ofprofit, minimization of n...

This paper aims to study Vygotsky’s (1987) sociocultural theory of learning with respect to how it relates to technology-based second language learning and teaching. The researchers selected their participants from advanced students from Payame Noor University. We divided the participants into two groups- an experimental group and a control group. After teaching the course an experimental group...