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In this paper, we define the notions of ultra and involution ideals in $BCK$-algebras. Then we get the relation among them and other ideals as (positive) implicative, associative, commutative and prime ideals. Specially, we show that in a bounded implicative $BCK$-algebra, any involution ideal is a positive implicative ideal and in a bounded positive implicative lower $BCK$-semilattice, the not...

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There exist a lot of methods for vision through an opaque medium. At present UWB (Ultra-Wideband) technology is used more and more because it is suitable for localization and detection of a human body behind a wall. First of all this paper describes known methods for vision through walls, which can be divided into two general groups imaging and non-imaging systems. Secondly it describes the sta...

The effects of different UWB antennas on body area propagation channel is analyzed. Different orientations of directional antennas and different spacings 13 between planar antennas and the body are investigated in an on-body scenario. Time domain channel parameters, e.g. mean delay and delay spread, are 15 extracted from measurement data. The distribution of the channel parameters allows classi...

This paper investigates a certain class of threedimensional (3-D) (volume) sources to the scalar wave equation that are capable of radiating high-amplitude short-duration pulses in a selected (main) direction and low-amplitude longduration pulses in other directions. Parameterization and characterization of such sources and the fields that they radiate is carried out in both the frequency and t...

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