Communications - Scientific Letters of the University of Zilina, 2011 (vol. 13), issue 1
Articles
Biomedical Technology - 2011 and Beyond
Vladimir Blazek
Communications - Scientific Letters of the University of Zilina 2011, 13(1):5-12 | DOI: 10.26552/com.C.2011.1.5-12 
Fundamental advances in knowledge and understanding across a range of specialized fields in medicine, biology, engineering and other natural sciences; the discovery of novel sensor concepts for non-invasive function diagnostics of diseases and abnormal developments at early stages; the development of cost-effective, automated measuring procedures that can be miniaturized to the cellular and molecular level; the implementation of new imaging techniques for optimized therapies and therapy-control - these are just some of the reasons for the rapid growth of biomedical technology as an independent field of study and research in the past decades.Furthermore,...
Low Frequency Electromagnetic Fields: Friend or Foe?
Ivo Cap, Jan Barabas
Communications - Scientific Letters of the University of Zilina 2011, 13(1):13-17 | DOI: 10.26552/com.C.2011.1.13-17
The issue of electromagnetic fields and their effects on human health has long been discussed within the scientific community. The lack of undisputable evidence confirming the dangers of these fields leads to great uncertainty and public concerns. On the other hand, positive effects and possible therapeutic use of the mentioned fields has also been explored and currently hints at feasible application thereof in regenerative and therapeutic applications. The following article provides a balanced insight into the issue at hand and provides details of recently proposed mechanisms of actions.
Simulation of Low Frequency Electromagnetic Field Effect on Cell Membrane Channels Model
Roman Radil, Jan Barabas
Communications - Scientific Letters of the University of Zilina 2011, 13(1):18-21 | DOI: 10.26552/com.C.2011.1.18-21
According to many current investigations, which approve the direct impact of potassium or sodium channels to the cell dividing processes, the presented article outlines an attempt to simulate influence of low frequency electromagnetic field to the cell membrane channels. Activation or inhibition of ion channels could be achieved by various mechanisms e.g. most common is chemical way. In contrast with this fact, the article describes simulations of external low frequency electromagnetic field application on the cell model, which should provide results comparable to the conventional methods.
Modelling of Arterial Bifurcation by Means of Electromechanical Model with Distributed Parameters
Barbora Czippelova, Daniela Gombarska
Communications - Scientific Letters of the University of Zilina 2011, 13(1):22-26 | DOI: 10.26552/com.C.2011.1.22-26
The present paper deals with the computer-aided modelling of blood vessels bifurcations using the electro-mechanical analogy with the electric transmission lines. The present model allows assessing the Murray's cubic law and its comparison with the real state of large and small arteries branching in the human body.
Some Methods for Development of Analytical Module in Telemedicine System for a Child Monitoring
Vitaly Levashenko, Sergey I. Karas, Miroslav Rusin, Evgeny E. Sizov
Communications - Scientific Letters of the University of Zilina 2011, 13(1):27-31 | DOI: 10.26552/com.C.2011.1.27-31
Telemedicine system is system that provides distance medical help and wide application of these systems is started. In the paper two telemedicine systems for pediatrics and specifications of their development are considered. This system will be used for decision different aspects in pediatrics, but both of these systems have similar structure and include special analytical module. The analytical module is used for estimation of initial data and forming of preliminary decision about patient state. Two methods for development of the module are proposed. One of them is based on fuzzy decision trees and second is logistic regression for prediction. These...
Biomaterials Inhomogeneities Detection by Electromagnetic Methods
Tatiana Strapacova, Klara Capova, Milan Smetana
Communications - Scientific Letters of the University of Zilina 2011, 13(1):32-36 | DOI: 10.26552/com.C.2011.1.32-36
The paper deals with the biomaterials nondestructive testing using electromagnetic methods. The eddy current testing and electromagnetic - acoustic transducer methods are analyzed and applied for evaluation of conductive prosthetic materials. The defects detection results achieved by simulations and measurements using both methods are compared and discussed.
The Influence of Inhomogeneity Present in Layered Biological Structure on Electromagnetic Field Distribution
Katarina Istenikova
Communications - Scientific Letters of the University of Zilina 2011, 13(1):37-41 | DOI: 10.26552/com.C.2011.1.37-41
The knowledge of electrical properties of biological materials and their interaction with electromagnetic waves is necessary for suitable determining the effect of electromagnetic field on biological systems and, sequentially, prevention of undesirable consequences on human organism. Because of complex heterogeneous structure of human body the electromagnetic field distribution in biological systems is very complicated and depends, among others, on the type of tissue and on the presence of complicated layered structures and interfaces. With the knowledge of these electrical properties the absorption of energy and the field distribution which are the...
Sophisticated Methods for Tissue Perfusion Evaluated
Libor Hargas, Dusan Koniar, Stanislav Stofan, Miroslav Hrianka
Communications - Scientific Letters of the University of Zilina 2011, 13(1):42-46 | DOI: 10.26552/com.C.2011.1.42-46
This paper focuses on image acquisition system designing for biomedical image enhancement. It introduces the possibilities of diagnostics and analysis of tissue via virtual instrumentation. The two dimensional images shot by the camera provide information about the surface properties and degradation of a real skin. The main idea is based on the human skin parameters measured for healthy and ill skin. The aforementioned access provides parameters evaluation by creating a structure model. The anomalies are recognized by this model.
Automatic Creation of Hypnogram
Michal Gala, Branko Babusiak, Vilem Novak
Communications - Scientific Letters of the University of Zilina 2011, 13(1):47-50 | DOI: 10.26552/com.C.2011.1.47-50
Polysomnography is an important diagnostic method used in sleep monitoring of patients with various sleep disorders. The formulation of a precise diagnosis requires correct evaluation and interpretation of polysomnography EEG and this evaluation is provided by a doctor. In order to save time, various automatic evaluations methods have been developed. One of these methods is based on signal division into 30 second long sections which are subsequently analyzed and reduced using adaptive segmentation and parameters are computed from these segments. Cluster analysis is used to divide individual segments and the class with biggest quantity of segments is...
Automatized Multi-Electrode Voltage Map Measurement of Active Points on Skin
Marek Kukucka, Zuzana Krajcuskova
Communications - Scientific Letters of the University of Zilina 2011, 13(1):51-55 | DOI: 10.26552/com.C.2011.1.51-55
Our contribution deals with the human skin voltage chart measurement. We have concentrated our effort on finding and following the measurement of active points on different parts of the skin's surface, to acknowledge their existence and position through a measuring process. The human skin has a certain impedance or resistance - it can be easily described and simulated using a substitute electric circuit. But the skin also contains parts with measurably lower impedance and different electric properties - we can show them clearly by measurement of voltage chart.
Determination of Predictive Factors of Choledocholithiasis in Cases of Acute Biliary Pancreatitis
Marta Horakova, Iveta Vadovicova
Communications - Scientific Letters of the University of Zilina 2011, 13(1):56-59 | DOI: 10.26552/com.C.2011.1.56-59
Choledocholithiasis (bile duct stones) may bring about biliopancreatic obstruction that eventually develops into acute biliary pancreatitis, which could become a serious, life threatening disease. Because stones have the propensity to move spontaneously from the bile duct, it is allimportant to determine as accurately as possible, whether biliopancreatic obstruction is still present or not. The aim is to avoid, wherever possible, any invasive and costly diagnostic and therapeutic procedures while preventing serious risk to the patient. In this paper, by retrospective analysis of patients with acute biliary pancreatitis, we examine laboratory and other...
The Worst Availability as a Parameter for Designing and Reporting on the Network Performances
Ivan Rados, Ladislav Schwartz
Communications - Scientific Letters of the University of Zilina 2011, 13(1):60-66 | DOI: 10.26552/com.C.2011.1.60-66
In the introductory part, the reasons why the availability is important are stated as well as the overview of the papers produced so far dealing with the problem of guaranteed availability. Furthermore, the basic concepts on availability are introduced with the special review of the parallel structure which can actually be applied onto the ring network. The principles of protection of the wavelength channel and optical multiplex section which are used in the ring WDM networks are described. Then the availabilities of different link configurations in relation to its protection are defined: without protection, protection using the same optical cable...
Slovak-English Vocalic Approximation
Zdena Kralova, Julius Zimmermann
Communications - Scientific Letters of the University of Zilina 2011, 13(1):67-71 | DOI: 10.26552/com.C.2011.1.67-71
The article is focused on the quality of English pronunciation of Slovak native speakers reflected in the formant structure of their short English vowels compared to the reference formant values of short English and Slovak vowels. The primary objective is to detect the level of phonic approximation within the system of English short vowels.