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Based on satellite derived NO2 column data from OMI, we analysed the characteristics of spatio-temporal distribution of tropospheric NO2 column density and its impact factors over Beijing-Tianjin-Hebei Region for 2005–2014.
In RFID systems, tag anti-collision algorithm is significantly important for fast tag identification, especial in mobile scenarios. In this paper, we propose group strategy for remaining tags algorithm (GSRA for short). The theoretic analysis shows that the system efficiency only concerns rate of migration and static system efficiency, and is not related with the number of tags. The simulation result...
Differential evolution algorithm is a strong effective method for optimization problems. Parameter setting is one crucial point to improve the DE's performance. Hence, a DE based on self-adaptive adjustment mechanism (SAMDE) is proposed to tune the size of offspring population NP besides mutation scale factor F and crossover constant Cr automatically. Moreover, the proposed algorithm applies a DE...
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