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Search Results: 1 - 10 of 1045 matches for " Jozef Hudec "
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Robert Mazur,Jozef Hudec,Kamila Kovalovská
Journal of Microbiology, Biotechnology and Food Sciences , 2012, DOI: 13385178
Abstract: Lactic acid bacteria (LAB) are nice targets in order to study γ-aminobutyric acid (GABA) production that has been reported to be effective in order to reduce blood pressure in experimental animals and human beings. In this study, we aimed to γ-aminobutyric acid (GABA) production in aerobical and anaerobical conditions, using different sources of microorganisms. The highest selectivity of GABA from precursor L-monosodium glutamate (82.22%) has been reported using of microorganisms from banana, and with addition of pyridoxal-5-phosphate (P-5-P). For augmentation of selectivity the application of the further stimulating factors of GABA biosynthesis is needed.
Róbert Mazur,Kamila Kovalovská,Jozef Hudec
Journal of Microbiology, Biotechnology and Food Sciences , 2011, DOI: 13385178
Abstract: In this study we observe the effect of fermentation conditions and resources of microorganisms for production of γ-aminobutyric acid (GABA). The content of produced GABA depends on various conditions such as the amount of precursor, an addition of salt, enzyme and the effect of pH. The highest selectivity of GABA (74.0 %) from the precursor (L-monosodium glutamate) has been determinate in the follow conditions: in the presence of pre-cultured microorganisms from Encián cheese in amount 1.66 % (w/v) the source of microorganisms/volume of the fermentation mixture, after the addition of 0.028 % (w/v) of CaCl2/volume of the fermentation mixture, 100 μM of pyridoxal-5-phosphate (P-5-P) and the GABA precursor concentration in the fermentation mixture 2.6 mg ml-1 in an atmosphere of gas nitrogen. Pure cultures of lactic acid bacteria increased the selectivity of GABA by an average of 20 % compared with bacteria from the path of Encián.
The Role of Ground-Based Robotic Observatories in Satellite Projects
R. Hudec
Advances in Astronomy , 2010, DOI: 10.1155/2010/594854
Abstract: We discuss the role of robotic telescopes in satellite projects, as well as related strategies. Most satellite projects in space astrophysics focus on high-energy astrophysics from X-rays to gamma-rays. A large fraction of objects of high-energy astrophysics emit also optical light, which is, in many cases, variable. The observation of these sources at optical wavelengths can provide valuable inputs for multispectral analysis of various categories of celestial high-energy (HE) sources. As the magnitudes of numerous objects are bright and can be hence accessed by robotic ground-based observatories, these observations can contribute to investigations and analyses of HE sources. We discuss in detail this possible contribution, with emphasis on the ESA INTEGRAL mission. In addition to this, there are also satellite projects outside the high-energy astronomy, in which the robotic telescopes can also play an important role. We will illustrate this on the example of the ESA satellite Gaia. In this project, robotic telescopes are expected not only to verify the triggers detected by satellite (such as transients and flares) but also to provide additional (mostly photometric) data for better scientific cases. 1. Introduction Most satellite projects in space astrophysics focus on high energy astrophysics from X-rays to gamma-rays. A large fraction of objects of high-energy astrophysics emit also optical light, which is, in many cases, variable (Figure 1). The observation of these sources at optical wavelengths can provide valuable inputs for multispectral analysis of various categories of celestial high-energy (HE) sources. As the magnitudes of numerous objects are bright and can be hence accessed by (even small) robotic telescopes, these devices can effectively contribute to investigations and analyses of HE sources. Figure 1: The distribution of optical magnitudes of optically identified INTEGRAL gamma-ray sources. Most are brighter than mag?20, and more than half are brighter than mag?15. Legend dark blue mag?2–6, orange mag?5–10, yellow mag?10–14, green mag?14–18, purple mag?18–22, light blue mag?22–26. The numbers in the plot indicate number of objects with optical magnitude within the indicated range. In addition to this, the robotic telescopes can also play an important role in satellite projects outside high-energy astrophysics. The astrometry mission Gaia of European Space Agency ESA can serve here as an example. As it will be shown later, very common is the situation when we have satellite (e.g., HE) monitoring data covering up to years, but we do not
Mladen Hudec
Rudarsko-Geolo?ko-Naftni Zbornik , 2002,
Abstract: More than 80 kilometers of underground corridors and rooms where are buried the Christians from early centuries of Christianity, represent an unique and authentic document of this time. The origin, the foprms and thechnology are remarkable, but particularly appreciable are the inscriptions, graphics and pictures conserved for centuries.
Convergence Performance of Adaptive Algorithms of L-Filters
Robert Hudec
Advances in Electrical and Electronic Engineering , 2003,
Abstract: This paper deals with convergence parameters determination of adaptive algorithms, which are used in adaptive L-filters design. Firstly the stability of adaptation process, convergence rate or adaptation time, and behaviour of convergence curve belong among basic properties of adaptive algorithms. L-filters with variety of adaptive algorithms were used to their determination. Convergence performances finding of adaptive filters is important mainly for their hardware applications, where filtration in real time or adaptation of coefficient filter with low capacity of input data are required.
TOPNET2. 2- CAD Program for CATV Network Design
P. Hudec
Radioengineering , 1993,
Mixed Noise Suppression in Color Images by Signal-Dependent LMS L-Filters
R. Hudec
Radioengineering , 2003,
Abstract: The paper is devoted to the signal-dependent (SD) design of adaptiveLMS L-filters with marginal data ordering for color images. The samestem of SD processing of noised grayscale images was applied on noisycolor images. Component-wise and multichannel modifications of SD LMSL-filter in R'G'B' (gamma corrected RGB signals) color space weredeveloped. Both modifications for filtering two-dimensional staticcolor images degraded by mixed noise consisting of additive Gaussianwhite noise and impulsive noise were used. Moreover, single-channelspatial impulse detectors as detectors of impulses and details wereused, too. Considering experimental results, SD modifications ofL-filters for noisy color images can be concluded to yield the bestresults.
Fuzzy improvement of the SQL
Hudec Miroslav
Yugoslav Journal of Operations Research , 2011, DOI: 10.2298/yjor1102239h
Abstract: Structured Query Language (SQL) is used to obtain data from relational databases. Fuzzy improvement of SQL queries has advantages in cases when the user cannot unambiguously define selection criteria or when the user wants to examine data that almost meet the given criteria. In this paper we examine a realization of the fuzzy querying concept. For this purposes the fuzzy generalized logical condition for the WHERE part of the SQL is created. It allows users to create queries by linguistic terms. The proposed model is an extension of the SQL so that no modification inside databases has to be undertaken.
Photometry and Low Dispersion Spectroscopy with ESA Gaia
René Hudec,Vojtěch ?imon,Luká? Hudec
Advances in Astronomy , 2010, DOI: 10.1155/2010/781421
Abstract: The ESA satellite to be launched in 2012 will focus on highly precise astrometry of stars and all objects down to limiting magnitude 20. Albeit focusing on astrometry related matters, the satellite will also provide photometric and spectral information and hence important inputs for various branches of astrophysics. Within the Gaia Variability Unit CU7 and related work package Specific Object Studies there are subwork packages accepted for optical counterparts of celestial high-energy sources and cataclysmic variables. Although the sampling of the photometric data will not be optimal for this type of work, the strength of Gaia in such analyses is the fine spectral resolution (spectrophotometry and ultra-low dispersion spectroscopy) which will allow the correct classication of related triggers. We will review the available low dispersion spectral surveys and discuss their use for a simulation and tests of the Gaia algorithms and Gaia data. 1. Introduction For many years, the state of art in celestial cartography has been the Schmidt surveys of Palomar and ESO, and their digitized counterparts. Gaia will provide the detailed 3-d distributions and space motions of all these stars, complete to mag 20. The measurement precision, reaching a few millionths of second of arc, will be unprecedented [1]. This will allow our Galaxy to be mapped, for the ?rst time, in three dimensions. It is obvious that, with the above briefly described performance, Gaia will provide valuable inputs to various research fields of contemporaneous astronomy and astrophysics including the field of high-energy sources. Most of the variable object research will be performed within the Gaia Variability Coordination Unit CU7. To study the optical counterparts of celestial high-energy sources, there will be several advantages provided by Gaia. First, this will be a deep limiting magnitude of 20 [2], much deeper than most of previous studies and global surveys. For example, no detailed statistics of variable stars has been investigated for magnitudes fainter than 18. Secondly, the time period covered by Gaia observations, that is, 5 years, will also allow some studies requiring long-term monitoring, recently provided mostly by astronomical plate archives and small or magnitude-limited sky CCD surveys. But perhaps the most important benefit of Gaia for these studies will surely be the color (spectral) resolution thanks to the low resolution (prism) Gaia spectroscope. This will allow some detailed studies involving analysis of the color and spectral changes not possible before. The details of
Mobille Business, Quo Vadis?
Robert Hudec,Peter Ciganek
Advances in Electrical and Electronic Engineering , 2004,
Abstract: This paper deals with present state of mobile segment of e-commerce and its future trends. In present days, each company, which would like to be successful on the global market, must implement ICT (Information and Communication Technology) to its internal relations, business processes and transactions. The aim of the e-commerce is to forward market development by using ICT, because it radically changes the way of organizations/companies function in all its relations. Mcommerce is a part of e-commerce realized by mobile ICT. Its great advantage is in high penetration of mobile phones and other mobile access devices. Technologies, services and security of actual m-business and expected trends of this segment in near future are analyzed step by step in this paper.
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