to doing this research daily interpolated temperature data from asfezari data base have been used. in order to recognition extreme cold days, the normalized temperature deviation index (ntdi) applied. then the index sorted according to extensive and severity and first 500 days selected for analysis. the geopotential height data extracted from www.esrl.noaa.gov data base. the thickness anomaly c...

For the problem of selecting p items with uncertain (interval) objective function coefficients so as to maximize total profit (maximization over uniform matroid) we introduce the r-restricted robust deviation criterion or the r-robust solution for short. We seek solutions that minimize the r-restricted robust deviation. This new criterion increases the modeling power of the robust deviation (mi...