We consider the problem of allocating multiple heterogeneous resources geographically and over time to meet demands that require some subset available resource types simultaneously at a specified time, location, duration. The objective is maximize total reward accrued from meeting (a of) demands. model this as an integer program, show it NP-hard, analyze complexity various special cases. introd...

This study aims to examine how Iranian EFL learners perceive and apply mitigation devices in request speech act in 4 asymmetrical situations. Role-play interactions and questionnaires were used to elicit the required data from Iranian informants (male vs. female). The results obtained from the analysis of data revealed that in identical situations, male requestors were comparably more certain t...