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Interactivity and Spatiality - Experiences of Modelling Real Work Places as Virtual Places in a VR Collabortive Environment

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

Co-optimization of FFT and FIR in a delayless acoustic echo canceller implementation

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

Establishing Cause-Effect Relationships in Activated Sludge Plants - what Can Be Controlled

Plant wide control problems in the activated sludge process have been revisited. The ultimate criteria for controlling a complete plant have been systematically addressed only infrequently. In principle, the effluent has to meet the standard at a minimal cost. Basically, the process is at the time driven by disturbances, mostly via the influent flow, but sometimes created within the plant. An esse