Two types of rod antennas of mobile phones are optimized so that the radiated energy absorbed by the head or body of the user is reduced and the radiation intensity to other areas especially to the receiver is increased. The mathematical modelling of this problem leads to an infinite dimensional...

This paper introduces a new class of non-convex vector functions strictly larger than that of P-quasiconvexity, with P⊆ [InlineMediaObject not available: see fulltext.]<Superscript> m </Superscript> being the underlying ordering cone, called semistrictly ( [InlineMediaObject not available: see fulltext.]<Superscript> m </Superscript>\ −int...</superscript></superscript>

We give a generic regularity condition under which each weakly efficient decision making unit in the CCR model of data envelopment analysis is also CCR-efficient. Then we interpret the problem of finding maximal parameters which preserve efficiency of CCR-efficient DMUs under directional...