Lesya Ukrainka Eastern European National University

Luts'k, Ukraine
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Stepanyuk S.,Lesya Ukrainka Eastern European National University
Perspective Technologies and Methods in MEMS Design, MEMSTECH'2010 - Proceedings of the 6th International Conference | Year: 2010

This paper provides an introduction to the field of artificial neural network by brief reviewing some neural net models that can be used for pattern recognition. There are made a few open problems in this area of research.

Odintsova A.,Ivan Franko National University of Lviv | Fishchuk O.,Lesya Ukrainka Eastern European National University
Acta Agrobotanica | Year: 2017

The general morphology and micromorphology of the flower in Polygonatum multiflorum, Maianthemum bifolium, and Convallaria majalis were studied using light microscopy methods. Among the studied species, P. multiflorum and C. majalis have syntepalous and trimerous flowers, and in M. bifolium flowers are the most reduced: they are dimerous, pentacyclic, and with free tepals. Only in P. multiflorum stamens are considerably adnate to the floral tube. The gynoecium of P. multiflorum consists of synascidiate, hemisymplicate, and asymplicate zones. In the gynoecium of M. bifolium and C. majalis, synascidiate, symplicate, and asymplicate vertical zones were revealed. In P. multiflorum and M. bifolium, the style is composed of postgenitally connated carpels, while in C. majalis the style is formed by congenitally fused carpels (symplicate gynoecium zone). A common pattern of the venation of the floral parts was revealed in all the species. The external flower morphology and the gynoecium inner structure are different in all three species, providing adaptations for the pollination mode. Attractive elements observed in the flower of P. multiflorum are the long septal nectary in the ovary and epidermal trichomes on the inner perigonium surface and on the filaments. In M. bifolium, a rudimentary external septal nectary was observed for the first time. No nectaries or other morphologically distinct secretory structures were found in the C. majalis flower, allowing considering the C. majalis flowers as pollen flowers. © The Author(s) 2017.

Stepanyuk S.,Lesya Ukrainka Eastern European National University
2011 11th International Conference - The Experience of Designing and Application of CAD Systems in Microelectronics, CADSM 2011 | Year: 2011

The goal of this paper is the consideration of the solving of visual attention on the based of winner-take-all neural networks. Selective tuning and Mozer model of visual attention are considered here. Also limitations, advances and open problems are shown. © 2011 Lviv Polytechnic National.

Krymus A.S.,Lesya Ukrainka Eastern European National University | Myronchuk G.L.,Lesya Ukrainka Eastern European National University | Parasyuk O.V.,Lesya Ukrainka Eastern European National University
Ukrainian Journal of Physics | Year: 2016

The optical properties of AgGaGe3Se8 single crystals doped with Cu, In, and Sn atoms have been studied. A physical model is proposed for those compounds, which are wide-gap semiconductors (Eg ≈ 2.09–2.15 eV at T = 300 K) with the p-type conductivity, and whose optical parameters depend on the dopant nature and concentration. On the basis of this model and making allowance for specific features of disordered systems, the obtained experimental results are explained. © A.S. KRYMUS, G.L. MYRONCHUK, O.V. PARASYUK, 2016.

Andrijchuk O.,Lesya Ukrainka Eastern European National University
Journal of Physical Education and Sport | Year: 2016

The article deals with the problems of a healthy, balanced eating habits for students who regularly attend classes of physical education (PE). The general features of the daily diet are analyzed. The experiment involved 1,620 students of Lesya Ukrainka Eastern European National University (age ‒ 17-22 years, gender ‒ 1213 female students (74.9%) and 407 male students (25.1%) who regularly attend PE classes. The survey was conducted using the suggested anonymous questionnaire. The study confirms that students usually eat at home or at their relatives, they do not follow a diet that is very important for people who are engaged in exercise regularly. Respondents have the symptoms of digestion disorders. They try to correct their body weight being on a diet. © JPES.

Yaryhin O.,Lesya Ukrainka Eastern European National University | Werneburg I.,Humboldt University of Berlin
Journal of Experimental Zoology Part B: Molecular and Developmental Evolution | Year: 2017

The neurocranium of vertebrates is mainly derived from early cartilaginous anlagen, the so-called chondrocranium, the base of the future skull. Two initial bar-shaped and paired chondrifications flank the notochord, the rostral trabecles and the caudal parachordals. In most reptiles, there is an additional component, the transverse acrochordal, which is placed between trabecles and parachordals. All these elements compose the base of the future chondrocranium. There are several drastically different hypotheses concerning the development and interrelationship of these elements. We reexamined the basicranial development in four squamates and found that all species show very similar conditions of early chondrocranial development. The anterior part of the notochord is not embedded into the basal plate as it was previously reported. It remains free. The medial edges of the parachordals form the lateral walls of the basicranial fenestra. Only the posterior portions of the parachordals fuse and form the basal plate. The space in-between the parachordals is filled with a thin layer of cells, which never chondrify. The anterior tips of the parachordals later fuse with the posterior edge of the acrochordal, which ultimately delimitates, as crista sellaris, the basicranial fenestra anteriorly. We consider the observed processes a common development at least in lizards and review a variety of methodological approaches and differences in data interpretation as reasons for the anatomical differences reported in the literature. Moreover, based on our data we argue that the acrochordal is of mesodermal origin, which coincides with results of fate map experimental studies. © 2017 Wiley Periodicals, Inc.

Kormosh Z.,Lesya Ukrainka Eastern European National University | Savchuk T.,Lesya Ukrainka Eastern European National University
Materials Science and Engineering C | Year: 2012

The characteristics, performance and application of novel triiodide potentiometric sensor based on ion-pair of Rhodamine B triiodide as a membrane carrier are described. The electrode has a linear dynamic range between 1 × 10 - 6 and 1 × 10 - 1 M, with a Nernstian slope of 68 ± 1 mV pC - 1 and detection limit of 3.9 × 10 - 7 M. Fast and stable response, good reproducibility, long-term stability, very good selectivity over a large number of common organic and inorganic anions, applicability over a pH range of 2-10 are demonstrated. The proposed sensor has been applied for potentiometric determination of some iodine species. © 2012 Elsevier B.V.

Mikhailyuk V.A.,Lesya Ukrainka Eastern European National University
Cybernetics and Systems Analysis | Year: 2016

Using gap-introducing and gap-preserving reductions, it is shown that there is no polynomial-time approximation scheme (PTAS) for the multiple reoptimization of the problem of calculating the chromatic number of a graph with a given exponentially growing set of optimal solutions when inserting an arbitrary vertex with no more than two edges incident to it and also when eliminating an arbitrary vertex together with all the edges incident to it. The same result holds for ordinary reoptimization. © 2016, Springer Science+Business Media New York.

Lishchuk N.V.,Lesya Ukrainka Eastern European National University
Journal of Automation and Information Sciences | Year: 2015

It is shown that for the set covering problems (which differ in one position of the constraint matrix) there are not κ-probabilistic polynomial procedures for the analysis of the stability (Κ ∈ {ZPP, RP}) for Κ ≠ NP.

Daszkiewicz M.,Institute of Low Temperature And Structure Research | Gulay L.D.,Lesya Ukrainka Eastern European National University
Materials Research Bulletin | Year: 2012

The compounds with the general formula Ln 3MTX 7 (space group P6 3) (Ln - rare-earth element, M - monovalent element (Cu, Ag), T - Si, Ge, Sn and X - S, Se) are interesting owing to the possible application in the field of ionic conductivity. In the crystal structure the face-sharing [Ag(S) 6] triangular antiprisms form the channels where the Ag + ion can migrate along the crystallographic c axis. High-pressure X-ray diffraction shows that Ag + ion moves towards the central-point of [Ag(S) 6] when pressure is risen. As a consequence, the coordination number of Ag + changes from CN = 3 to CN = 6 at ∼3 GPa. The La 3Ag 0.82SnS 7 has stiff structure; zero-pressure bulk modulus is B 0 = 61.74 GPa and the pressure derivative is B' 0=4.02. © 2011 Elsevier Ltd. All rights reserved.

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