Brno University of Technology

About: Brno University of Technology is a education organization based out in Brno, Czechia. It is known for research contribution in the topics: Computer science & Fracture mechanics. The organization has 6339 authors who have published 15226 publications receiving 194088 citations. The organization is also known as: Vysoké učení technické v Brně & BUT.

A Comparative Analysis of Methods for Evaluation of ECG Signal Quality after Compression

Abstract: The assessment of ECG signal quality after compression is an essential part of the compression process. Compression facilitates the signal archiving, speeds up signal transmission, and reduces the energy consumption. Conversely, lossy compression distorts the signals. Therefore, it is necessary to express the compression performance through both compression efficiency and signal quality. This paper provides an overview of objective algorithms for the assessment of both ECG signal quality after compression and compression efficiency. In this area, there is a lack of standardization, and there is no extensive review as such. 40 methods were tested in terms of their suitability for quality assessment. For this purpose, the whole CSE database was used. The tested signals were compressed using an algorithm based on SPIHT with varying efficiency. As a reference, compressed signals were manually assessed by two experts and classified into three quality groups. Owing to the experts’ classification, we determined corresponding ranges of selected quality evaluation methods’ values. The suitability of the methods for quality assessment was evaluated based on five criteria. For the assessment of ECG signal quality after compression, we recommend using a combination of these methods: PSim SDNN, QS, SNR1, MSE, PRDN1, MAX, STDERR, and WEDD SWT.

The Balanced Scorecard: Innovative Performance Measurement and Management Control System

Abstract: The paper presents an overview of studies that have described the emergence of innovative performance measurement systems. It is dedicated to the issue of potential implementation of Balanced Scorecard as a strategic management control system in Czech small and medium-sized enterprises. The framework is based on literature review and analysis about traditional management control systems, their pros and cons, and modern methods of performance measurement, such as Balanced Scorecard. Numerous publications discuss its potential advantages and recommend its implementation. On the other hand, there exist huge limitations for small and medium-sized enterprises, such as time, organization and money. Benefits resulting from successful Balanced Scorecard implementation must overweigh the costs of designing, implementing, and using it. Therefore, the paper is supposed to motivate researchers to conduct more large scale studies in the area of innovative performance measurement systems implementation in different business sector and areas.

Computing simulations over tree automata: efficient techniques for reducing tree automata

Abstract: We address the problem of computing simulation relations over tree automata. In particular, we consider downward and upward simulations on tree automata, which are, loosely speaking, analogous to forward and backward relations over word automata. We provide simple and efficient algorithms for computing these relations based on a reduction to the problem of computing simulations on labelled transition systems. Furthermore, we show that downward and upward relations can be combined to get relations compatible with the tree language equivalence, which can subsequently be used for an efficient size reduction of nondeterministic tree automata. This is of a very high interest, for instance, for symbolic verification methods such as regular model checking, which use tree automata to represent infinite sets of reachable configurations. We provide experimental results showing the efficiency of our algorithms on examples of tree automata taken from regular model checking computations.