Window effect on wall penetration loss in mobile communications
In mobile communication scenarios, a window opening on a wall enhances the field strength inside the room, as compared to a whole wall. Scarce models in the literature address this topic, or objectively quantify this effect relating it to window dimensions - this is the objective of the present paper. Wall and window are treated as an antenna aperture with the appropriate field distribution, which re-radiates its near field into the room. Measurements on a scaled model of a wall with different window sizes show good agreement with simulations. Based on simulation results, a statistical model is constructed to enable fast quantification of the window effect through a "window gain" parameter.
The wireless friendly building
This paper concerns the wireless friendly building — an approach to building design where wireless system performance is considered as part of the design process. This is particularly important where multiple users of many different systems are likely to be in close proximity as in an office or similar environment. Such a building design can also include introducing measures such as frequency sensitive walls to improve performance. While a true wireless friendly building is still in embryonic stages, there have been recent advances in performance simulation which are reported together with potential further research directions.
On the ontology of particle mass and energy in special relativity
Einstein claimed that the fundamental dynamical insight of special relativity was the equivalence of mass and energy. I disagree. Not only are mass and energy not equivalent (whatever exactly that means) but talk of such equivalence obscures the real dynamical insight of special relativity, which concerns the nature of 4-forces and interactions more generally. In this paper I present and defend a new ontology of special relativistic particle dynamics that makes this insight perspicuous and I explain how alleged cases of mass–energy conversion can be accommodated within that ontology.