Veliko Turnovo, Bulgaria
Veliko Turnovo, Bulgaria

The St. Cyril and St. Methodius University of Veliko Tarnovo is a Bulgarian university based in the city of Veliko Tarnovo. It was established on 15 September 1963 as a pedagogical institute. The university is the second largest in Bulgaria after Sofia University. It is named after the creators of the Bulgarian alphabet St. Cyril and St. Methodius. The first four disciplines were Bulgarian Philology, Russian Philology, History, and Arts. Since then, the university has grown to become the largest one outside Sofia, with over 60 different disciplines in 8 faculties being available to students, as well as two colleges in Pleven and Vratsa. Wikipedia.


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Bouyuklieva S.,University of Veliko Tarnovo | Yankov N.,University of Shumen | Kim J.-L.,Sogang University
Finite Fields and their Applications | Year: 2012

The purpose of this paper is to complete the classification of binary self-dual [48,24,10] codes with an automorphism of odd prime order. We prove that if there is a self-dual [48,24,10] code with an automorphism of type p-(c,f) with p being an odd prime, then p=3, c=16, f=0. By considering only an automorphism of type 3-(16,0), we prove that there are exactly 264 inequivalent self-dual [48,24,10] codes with an automorphism of odd prime order, equivalently, there are exactly 264 inequivalent cubic self-dual [48,24,10] codes. © 2012 Elsevier Inc.


Bouyuklieva S.,University of Veliko Tarnovo | Bouyukliev I.,Bulgarian Academy of Science
IEEE Transactions on Information Theory | Year: 2012

An efficient algorithm for classification of binary self-dual codes is presented. As an application, a complete classification of the self-dual codes of length 38 is given. © 1963-2012 IEEE.


Bouyukliev I.,Bulgarian Academy of Science | Georgieva-Trifonova T.,University of Veliko Tarnovo
Electronic Library | Year: 2013

Purpose - The aim of this paper is to propose the bibliographic information system 'Personal eLibrary bgMath'. This is a system for the organisation, storage and usage of digitalised literature. It supports the user in organising his/her publications and his/her library of electronic issues. The system is very convenient, especially for scientific literature. Design/methodology/ approach - The methodology to design a database storing information about publications and other literature is presented. The entity-relationship model of the database is described. The relational tables, obtained after the transformation of the created ER model into a relational model, are given. The paper contains the description of the forms implementing two basic tasks of the presented program, i.e. input and search for publications. The database is implemented by means of the database management system Microsoft Access 2007. Findings - The system Personal eLibrary bgMath allows easy manipulation of materials (papers, dissertations, reports, etc.) and references, which are used frequently and are very often necessary in scientific activity such as research, writing papers and dissertations, preparing reports and web pages or application documentation. The proposed program is free and a user guide is available. Originality/value - This paper proposes a practical method for creating a bibliographic system for scientific literature and explains its basic functional features. © Emerald Group Publishing Limited.


Bouyuklieva S.,University of Veliko Tarnovo | Malevich A.,Otto Von Guericke University of Magdeburg | Willems W.,Otto Von Guericke University of Magdeburg
IEEE Transactions on Information Theory | Year: 2010

Let C be a binary extremal self-dual code of length n ≥ 48. We prove that for each σ ∈ Aut(C) of prime order p ≥ 5 the number of fixed points in the permutation action on the coordinate positions is bounded by the number of p-cycles. It turns out that large primes p, i.e., n-p small, seem to occur in |Aut(C)| very rarely. Examples are the extended quadratic residue codes. We further prove that doubly even extended quadratic residue codes of length n=p+1 are extremal only in the cases n=8, 24, 32, 48, 80, and 104. © 2010 IEEE.


Galabov M.,University of Veliko Tarnovo
Radioengineering | Year: 2014

This article presents a new concept of using the auto-focus function of the monoscopic camera sensor to estimate depth map information, which avoids not only using auxiliary equipment or human interaction, but also the introduced computational complexity of SfM or depth analysis. The system architecture that supports both stereo image and video data capturing, processing and display is discussed. A novel stereo image pair generation algorithm by using Z-buffer-based 3D surface recovery is proposed. Based on the depth map, we are able to calculate the disparity map (the distance in pixels between the image points in both views) for the image. The presented algorithm uses a single image with depth information (e.g. z-buffer) as an input and produces two images for left and right eye.


Bouyuklieva S.,University of Veliko Tarnovo | Varbanov Z.,University of Veliko Tarnovo
Advances in Mathematics of Communications | Year: 2011

Abstract. In the present work we study a class of singly-even self-dual codes with the special property that the minimum weight of their shadow is 1. Some of these codes support 1 and 2-designs. Using them, we describe two types of schemes based on codes, the first is an one-part secret sharing scheme and the second is a two-part sharing scheme. Similar schemes can be constructed from self-dual codes that support 3-designs. © 2011 AIMS-SDU.


Bouzov V.,University of Veliko Tarnovo
Analele Universitatii din Craiova, Seria Filozofie | Year: 2016

Knowledge is one of the most important factors determining the development of global economy and overcoming the present existing inequalities. Humankind needs a fair distribution of the potential of knowledge because its big social problems and difficulties today are due to the existence of deep-going differences in its possession and use. This paper is an attempt to analyze and present certain philosophical arguments and conceptions justifying cooperative decision-making in the searching for fair distribution of the benefits of knowledge in the globalized world. Made individually or collectively, these decisions do not worsen the status of anyone - rather they can lead to the use of benefits of knowledge in the interest of all people. A fair distribution of resources and achievements of a knowledge-based economy is of key importance for the future of humankind. There exist three significant roads to justification of cooperative decisionmaking in a global aspect. The main problem here is that of how to ensure equal access of all members of the global society to benefits of knowledge. In this paper are considered communitarianism, J. Habermas theory of communicative action and public choice theories. The right to participate in activities of the knowledge society and to share in its wealth is related to the use of social and economic benefits. A distributive justice, including such right, could be based on communitarian political and moral values and principles. Any violation of such principles means existence of social injustice, with lasting consequences, including loss of access to natural goods, such as food and water.


Georgieva-Grosse M.N.,Consulting and Researcher in Physics and Computer science | Georgiev G.N.,University of Veliko Tarnovo
Proceedings of the 2013 International Conference on Electromagnetics in Advanced Applications, ICEAA 2013 | Year: 2013

A recapitulation of the up-to-date methods for accurate calculation of the differential phase shift provided by the azimuthally magnetized circular ferrite waveguide, under normal TE0n modes excitation, is presented. The debate is focused on two groups of numerical techniques, each of which incorporates three schemes, connected with definite physical working regimes of the structure. The key point in all of them is the repeated application of an iterative procedure, yielding the positive purely imaginary zeros of the complex Kummer function Φ(a, c; x) of specially selected parameters and variable, accepted as wave function for propagation, for a fluctuating imaginary part of its complex parameter a The first set of routines allows to obtain the phase shifting diagram (the aggregate of the area of phase shifter operation and of the differential phase shift characteristics) of the configuration for the normal TE01 mode in the r0-Δβ-plane, while the second one - the same in the α-Δβ-plane. (r0 and Δβ are the normalized in an appropriate way guide radius and phase shift of the wave and α is the off-diagonal ferrite permeability tensor element.) The main result of the study is that for fixed r0, Δβ is almost proportional to α in the whole area in which it might be afforded. © 2013 IEEE.


Georgiev G.N.,University of Veliko Tarnovo | Georgieva-Grosse M.N.,Consulting in Physics and Computer science
Proceedings - 2011 International Conference on Electromagnetics in Advanced Applications, ICEAA'11 | Year: 2011

The theory of the L numbers - the positive real limits of certain sequences of numbers, constructed through the positive purely imaginary zeros of the complex Kummer or of definite special functions, composed of several complex Kummer and Tricomi confluent hypergeometric and eventually also of some real cylindrical ones of suitably chosen parameters, is formulated. The limits are attained, when the imaginary part of the complex first parameter(s) of the confluent function(s) tends to minus infinity (to minus and plus infinity, if cylindrical functions are involved). The discussion is confined to the subclasses L1 (c,n) and L2 (c,ρ,n) , (c - arbitrary real, n - natural and ρ- positive real number, less than unity) of the general family of L numbers, linked with the zeros of the Kummer function and of a function, formed as a combination of two Kummer and two Tricomi ones, resp. Definitions of the numbers are given, procedures for their computational modeling are devised and some of their properties are found. The cases c - different from and c - equal to a negative integer or zero (when the Kummer function has no sense), are considered. Tables of values of L1 (c,n) and L2 (c,ρ,n) are compiled. Graphs illustrate the numerical results. The application of quantities examined in the analysis of the normal TE0n modes propagation in the azimuthally magnetized circular and coaxial ferrite waveguide, is debated. © 2011 IEEE.


Georgieva-Grosse M.N.,Consulting in Physics and Computer science | Georgiev G.N.,University of Veliko Tarnovo
Proceedings - 2011 International Conference on Electromagnetics in Advanced Applications, ICEAA'11 | Year: 2011

The classes A1, B1, C1 and A2, B2, C2 of positive real numbers are defined by means of the positive purely imaginary zeros of a complex Kummer confluent hypergeometric function and of a complex function, composed of two Kummer and two Tricomi confluent ones, resp. of specially selected parameters. Based on numerical examples, methods for computational modeling of these quantities, are presented. The comparison between them reveals that finding the values of elements of the second group is much more complicated. Their slighter dependence on certain parameters, however, allows to get better results in employing a definite scheme for approximate calculation of the differential phase shift, raised by the coaxial ferrite waveguide with azimuthal magnetization for the normal TE 0n modes than when the same procedure, harnessing the first set of numbers, is applied to a circular configuration, filled in by the medium mentioned. © 2011 IEEE.

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