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Stored energy and Q-factors are used to quantify the performance of small antennas. Accurate and efficient evaluation of the stored energy is also essential for current optimization and the associated physical bounds. Here, it is shown that the frequency derivative of the input impedance and the stored energy can be determined from the frequency derivative of the electric field integral equation.
In this paper I will discuss interactivity and spatiality, including the relationships between virtual places and work places. The paper reports some initial experiences of using a virtual reality (VR) tool for collaborative modelling. The aim was to investigate how well this technology could support participatory design of work environments. In a pilot study a group of researchers carried out an
In application specific implementation of digital signal processing algorithms optimization is important for a low power solution, not only on block level but also between blocks. This paper presents a co-optimization of a fast Fourier transform and a finite impulse response filter in a silicon implementation of an acoustic echo. The optimization gain can be measured in the number of operations an
