As part of an ongoing project to unify the treatment of symmetric lenses (of various kinds) as equivalence classes of spans of asymmetric lenses (of corresponding kinds) we relate the symmetric delta lenses of Diskin et al, with spans of asymmetric delta lenses. Because delta lenses are based on state spaces which are categories rather than sets there is further structure that needs to be accou...

The article describes semi-symbolic methods for the analysis of control and signal processing systems, including static and dynamic uncertainties. This above mentioned semi-symbolic description of uncertainties is based upon affine arithmetic. A short introduction to affine arithmetic is given. As affine arithmetic is only able to describe static uncertainties, an extension for effects of dynam...

A qualitative modelling approach is used into the description of lime-mash flow processes of an industrial lime transport machine in order to monitor and analyze its performance prior to its application. Realistic and reliable qualitative models of the lime transport system under investigation were produced offline. The results obtained from running the simulation of these models, in order to a...

Critical thinking skills are seen as one of the most important skills for researchers. Mash-Up Research Environments have the potential to activate these skills. While these environments already have their own value, this work provides a first step in answering the question of whether or not they activate thinking processes, and as a further step, what quality of thinking is activated. Consider...

Abstract: In this paper, a novel spatial domain 2-D sigma-delta modulation using two-layered discrete-time cellular neural networks (DT-CNNs) with multi-stage noise shaping (MASH) property is proposed. Although the sigmadelta modulation is widely used for realizing of analog to digital converter (ADC), sigma-delta concepts are only for 1-D signals. Signal processing in the digital domain is ext...

Sigma factors control global switches of the genetic expression program in bacteria. Different sigma factors compete for binding to a limited pool of RNA polymerase (RNAP) core enzymes, providing a mechanism for cross-talk between genes or gene classes via the sharing of expression machinery. To analyze the contribution of sigma factor competition to global changes in gene expression, we develo...

The central theme of this thesis is one-bit quantization of bandlimited signals via Sigma-Delta modulation. In this commonly used analog-to-digital conversion method, the signal of interest is represented by a ±1-valued sequence that is computed recursively from regular samples of the signal via a difference equation. The key feature of the method is that the low frequency content of the quanti...