increasing global notices in environmental protection, green supply chain management (gscm) has received much attention by researchers and managers more than the past. commonly, firms have considered cost criteria to select their suppliers. despite the fact that there are various papers considering the formal criteria in supplier selection, there is a few limited numbers considering the environ...

This paper studies T -preorders by using their Representation Theorem that states that every T -preorder on a set X can be generated in a natural way by a family of fuzzy subsets of X . Especial emphasis is made on the study of onedimensional T -preorders (i.e.: T -preorders that can be generated by only one fuzzy subset). Strong complete T -preorders are characterized.

The present paper aims at studying factors affecting knowledge workers’ productivity in national Iranian Oil Company, using descriptive survey method. 90 experts working at staff divisions were sampled, using census method and responded to a reliably confirmed questionnaire. One sample t test revealed at α= 0.05 that individual level factors, such as competence, job satisfaction, proficiency ha...

When sample sizes are small, it becomes challenging for an asymptotic test requiring diverging to maintain accurate Type I error rate. In this paper, we consider one-sample, two-sample and ANOVA tests mean vectors when data high-dimensional but very small. We establish t-distributions of the proposed U-statistics, which only require dimensionality diverge be fixed no less than 3. The rates a wi...