Wyniki 1-3 spośród 3 dla zapytania: authorDesc:"Jan ZIDEK"

Refining the diagnostic quality of the abdominal fetal electrocardiogram using the techniques of artificial intelligence

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This article deals with utilization of the combination of the fuzzy system and artificial intelligence techniques, called the Adaptive Neuro Fuzzy Inference System ANFIS, with the aim to refine the diagnostic quality of the abdominal fetal electrocardiogram FECG. Within the scope of the experiments carried out and based on the ANFIS structure the authors created a complex system for removing the undesirable mother's MECG degrading the abdominal FECG. Current research shows that the application of the conventional systems for enhancing the diagnostic quality of the abdominal FECG faces a series of problems (e.g. non-linear character of the task to solve, computational complexity of RLS algorithms, etc.). The need for a higher diagnostic quality of the abdominal FECG is reflected in the authors’ intention to utilize the designed system for the latest intrapartum monitoring method, called ST analysis. In terms of this advanced method, the aspect subjected to a diagnostic analysis is the ST segment of the FECG curve. The results indicate that the system utilizing ANFIS shows better experimental results than the conventional systems based on the LMS or RLS adaptive algorithms. The proposed adaptive system aims to clear any doubts in evaluation of the results of ST analysis while using a non-invasive method of external monitoring. Streszczenie. W artykule przedstawiono wykorzystanie fuzji metod: zbiorów rozmytych i sztucznej inteligencji ANFIS do poprawy jakości diagnostyki elektrokardiografii płodu. Głównym problemem jest usunięcie sygnału pochodzącego od matki który znacznie przewyższa sygnał płodu. (Poprawa jakości sygnału elektrokardiogramu płodu przy wykorzystaniu narzędzi sztucznej inteligencji) Keywords: ANFIS, FECG, MECG, ST analysis. Słowa kluczowe: ANFIS, elektrokardiogram Introduction Modern medical diagnostic apparatuses [7], [8], [23], which are used for external (abdominal) monitoring of FECG [1], encounter a number of[...]

The implementation of channel coding into the digital transmission chain consisting of VSG PXI-5670 - VSA PXI-5661

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This article is focused on techniques for error detection and correction, which occur during a transmission in modern digital communication channels. The real implementation of these channel coding techniques into the digital communication system is presented in this article. The system is based on the PXI modular platform consisting of RF VSG PXI-5670 and RF VSA NI PXI-5661. The proposed communication system structure is based on a software-defined radio conception. Author’s goal was to describe and afterwards with real measuring, to revise properties of the measuring system based on this flexible approach. These systems seem to be very useful for testing of new generation transmission systems. Streszczenie. W artykule przedstawiono metody wykrywania i korekcji błędów przy transmisji danych. Zastosowano kodowanie kanałów wykorzystujące systemy RF VSG PXI-5670 i RF VSA NI PXI-5661. (Zastosowanie kodowania kanałów w cyfrowej transmisji bazujące na RF VSG PXI-5670 i RF VSA NI PXI-5661) Keywords: channel coding, error detection and correction, digital M-ary-QAM. Słowa kluczowe: kodowanie kanałów, transmisja danych, wykrywanie błędów Introduction With current communication systems we can see large increase of requirements for maximal allowable bit error rate (BER) [1]. BER value varies in range from 10-2 to 10-12 Concrete value depends on the transmitted signal type (f.e. telephone call signal BER = 10-4, HDTV BER = 10-10 for more details see [10]). However, these requirements cannot be met even with the use of most advanced modulationdemodulation methods [2]. In these cases, a situation can be improved by an appropriate protective signal coding carrying information in a transmitter channel encoder with convenient detection and if it is possible also with an automatic correction of incorrect received data in receiver channel decoder. In many of their publications, the authors of this article are writing about the adaptive equaliz[...]

BER Measurement in Software Defined Radio Systems

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The article describes a flexible concept of measuring system consisting of PXI-5670 RF vector signal generator and PXI 5661 RF vector signal analyzer. The measuring system structure is based on PXI modular system that applies synthetic instrumentation concept - software-based approach to measurement of wireless transmission systems basic parameters. Synthetic instrumentation is the future, particularly in sectors where the demand for fast evolution and increased flexibility of electronics systems has driven the trend for increasing software content of electronics systems. Authors of this article created with LabVIEW 2010 SP1 synthetic measuring instruments for measuring the real bit error rate BER, applicable in the field of advanced wireless transmission systems.[...]

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