The aim of the paper is to propose approach for enhancement of time-frequency representation leading to the background noise suppression. The approach is based on combination of continuous wavelet analysis, timevarying autoregressive process and short time Fourier transform. By such combination we make the identification of important areas in the time-frequency representation easier. The propos...

A continuous evolution of business process parameters, constraints and needs, hardly foreseeable initially, requires from the business process management systems a continuous design and a reliable process model. In this paper, we are interested in developing a reactive design through a process log analysis ensuring process re-engineering and execution reliability. We propose to analyse workflow...

Brokate and Sprekels introduced the notion of hysteresis operators of the Preisach type (HOPTs), that are more general than (and include as a subset) the classical Preisach operator. In this paper, we provide a mathematical framework to the important representation problem for HOPTs by presenting two results on the approximation of the output function on the set of memory curves. One of the res...

This paper extends the traditional representation model for geographic data. The traditional representation model is based on a two-dimensional, static, time-independent world, where only well defined or continuous objects exit. This of course is a very limited representation of the real world. The extended model considers a multi-dimensional, dynamic, time-dependent world where objects can be ...