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35 results on '"Kralev, Velin"'

1. Combining Genetic Algorithm with Local Search Method in Solving Optimization Problems.

Author

Kralev, Velin and Kraleva, Radoslava

Subjects
EVOLUTIONARY algorithms, GRAPH theory, SEARCH algorithms, UNDIRECTED graphs, COMPLETE graphs
Abstract

This research is focused on evolutionary algorithms, with genetic and memetic algorithms discussed in more detail. A graph theory problem related to finding a minimal Hamiltonian cycle in a complete undirected graph (Travelling Salesman Problem—TSP) is considered. The implementations of two approximate algorithms for solving this problem, genetic and memetic, are presented. The main objective of this study is to determine the influence of the local search method versus the influence of the genetic crossover operator on the quality of the solutions generated by the memetic algorithm for the same input data. The results show that when the number of possible Hamiltonian cycles in a graph is increased, the memetic algorithm finds better solutions. The execution time of both algorithms is comparable. Also, the number of solutions that mutated during the execution of the genetic algorithm exceeds 50% of the total number of all solutions generated by the crossover operator. In the memetic algorithm, the number of solutions that mutate does not exceed 10% of the total number of all solutions generated by the crossover operator, summed with those of the local search method. [ABSTRACT FROM AUTHOR]

Published
2024
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2. STDP Plasticity in TRN Within Hierarchical Spike Timing Model of Visual Information Processing

Author

Koprinkova-Hristova, Petia, Bocheva, Nadejda, Nedelcheva, Simona, Stefanova, Miroslava, Genova, Bilyana, Kraleva, Radoslava, Kralev, Velin, Rannenberg, Kai, Editor-in-Chief, Soares Barbosa, Luís, Editorial Board Member, Goedicke, Michael, Editorial Board Member, Tatnall, Arthur, Editorial Board Member, Neuhold, Erich J., Editorial Board Member, Stiller, Burkhard, Editorial Board Member, Tröltzsch, Fredi, Editorial Board Member, Pries-Heje, Jan, Editorial Board Member, Kreps, David, Editorial Board Member, Reis, Ricardo, Editorial Board Member, Furnell, Steven, Editorial Board Member, Mercier-Laurent, Eunika, Editorial Board Member, Winckler, Marco, Editorial Board Member, Malaka, Rainer, Editorial Board Member, Maglogiannis, Ilias, editor, Iliadis, Lazaros, editor, and Pimenidis, Elias, editor

Published
2020
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3. An Event Grouping Based Algorithm for University Course Timetabling Problem

Author

Kralev, Velin, Kraleva, Radoslava, and Yurukov, Borislav

Subjects
Computer Science - Artificial Intelligence, Mathematics - Optimization and Control
Abstract

This paper presents the study of an event grouping based algorithm for a university course timetabling problem. Several publications which discuss the problem and some approaches for its solution are analyzed. The grouping of events in groups with an equal number of events in each group is not applicable to all input data sets. For this reason, a universal approach to all possible groupings of events in commensurate in size groups is proposed here. Also, an implementation of an algorithm based on this approach is presented. The methodology, conditions and the objectives of the experiment are described. The experimental results are analyzed and the ensuing conclusions are stated. The future guidelines for further research are formulated., Comment: 8 pages, 8 figures, 9 tables, International Journal of Computer Science and Information Security (IJCSIS), PaperID 31051699, Vol. 14, No. 06, June 2016

Published
2016

4. A Conceptual Design of Mobile Learning Applications for Preschool Children

Author

Kraleva, Radoslava, Kralev, Velin, and Kostadinova, Dafina

Subjects
Computer Science - Computers and Society, Computer Science - Human-Computer Interaction
Abstract

This article focuses on the possibilities of using mobile learning in the Bulgarian preschool education of young children. The state preschool educational regulations are presented and discussed. The problem concerning the children's safety when using mobile devices in terms of access to information on the Internet is revealed and analyzed. Two conceptual models of applications for mobile learning aimed at preschool children are designed. Their advantages and disadvantages are outlined and discussed. Keywords - mobile applications for children, mobile learning, design of mobile learning component, software engineering, Comment: 6 pages, 2 figures, pp. 259-267, International Journal of Computer Science and Information Security (IJCSIS), Vol. 14 (5), pp. 259-264, 2016

Published
2016

5. Variable Neighborhood Search Based Algorithm for University Course Timetabling Problem

Author

Kralev, Velin and Kraleva, Radoslava

Subjects
Computer Science - Data Structures and Algorithms, Computer Science - Computers and Society
Abstract

In this paper a variable neighborhood search approach as a method for solving combinatoric optimization problems is presented. A variable neighborhood search based algorithm for solving the problem concerning the university course timetable design has been developed. This algorithm is used to solve the real problem regarding the university course timetable design. It is compared with other algorithms that are tested on the same sets of input data. The object and the methodology of study are presented. The main objectives of the experiment are formulated. The conditions for conducting the experiment are specified. The results are analyzed and appropriate conclusions are made. The future trends of work in this field are presented., Comment: 13 pages, 4 figures, 5 tables, in proc. of the Fifth International Scientific Conference 2013 (FMNS2013), pp. 202-214, Bulgaria

Published
2016

6. On model architecture for a children's speech recognition interactive dialog system

Author

Kraleva, Radoslava and Kralev, Velin

Subjects
Computer Science - Human-Computer Interaction, Computer Science - Computation and Language, Computer Science - Sound
Abstract

This report presents a general model of the architecture of information systems for the speech recognition of children. It presents a model of the speech data stream and how it works. The result of these studies and presented veins architectural model shows that research needs to be focused on acoustic-phonetic modeling in order to improve the quality of children's speech recognition and the sustainability of the systems to noise and changes in transmission environment. Another important aspect is the development of more accurate algorithms for modeling of spontaneous child speech., Comment: 6 pages, 2 figures, in proc. of conference FMNS 2009, Blagoevgrad, Bulgaria

Published
2016

7. Analysis of applications suitable for mobile learning of preschool children

Author

Stoimenovski, Aleksandar, Kraleva, Radoslava, and Kralev, Velin

Subjects
Computer Science - Computers and Society
Abstract

This article considers the use of mobile learning in Bulgarian education by young children. The most used mobile operating systems are analyzed. Also some of the most used existing applications suitable for mobile learning of preschool children are presented and classified. Keywords: Mobile applications for preschool children, mobile learning., Comment: 6 pages, in Bulgarian, 3 tables, Conference SDSS-2016, in Bulgarian

Published
2016

8. On model of information system for management of information flows

Author

Kraleva, Radoslva and Kralev, Velin

Subjects
Computer Science - Software Engineering
Abstract

In this article are discussed some problems in developing software related to the management of information flows. We presented the basic stages in their development. We bold a methodology for conceptual modeling and design of information systems of this type. In order to demonstrate the effectiveness of the proposed model is an information system for administrative services of graduate students in the university., Comment: 8 pages, in Bulgarian, 4 figures in II Balkan Scientific Conference The Science, the Education and the Art in 21st Century, Bulgaria, Blagoevgrad, 26-27 September 2009, pp. 203-210

Published
2016

9. Investigating the opportunities of using mobile learning by young children in Bulgaria

Author

Kraleva, Radoslava, Stoimenovski, Aleksandar, Kostadinova, Dafina, and Kralev, Velin

Subjects
Computer Science - Computers and Society
Abstract

This paper provides an analysis of literature related to the use of mobile devices in teaching young children. For this purpose, the most popular mobile operating systems in Bulgaria are considered and the functionality of the existing mobile applications with Bulgarian interface is discussed. The results of a survey of parents' views regarding the mobile devices as a learning tool are presented and the ensuing conclusions are provided., Comment: pp. 51-55, 7 figures, 1 table, International Journal of Computer Science and Information Security (IJCSIS), Vol. 14 No. 4 APRIL 2016

Published
2016

32. СЪЗДАВАНЕ НА ИНТЕРАКТИВНО УЧЕБНО СЪДЪРЖАНИЕ ОРИЕНТИРАНО КЪМ ВИДЕОКЛИПОВЕ

Author

Kralev, Velin, Kraleva, Radoslava, Botseva, Daniela, and Kostadinova, Dafina

Subjects
ИНТЕРАКТИВНО УЧЕБНО СЪДЪРЖАНИЕ, ВИДЕОКЛИПОВЕ
Abstract

Добавянето на интерактивно учебно съдържание под формата на мултимедийни обекти (например, изображения и видео) към определена дисциплина в платформата Blackboard LearnTM не е сложен процес. Самото създаване на това учебно съдържание, обаче, не е предмет (като функционалност) на самата платформа. За тази цел могат да бъдат използвани други приложни програми.

Published
2014

33. On Some Grammatical Aspects of the Speech of Children with Communicative Disorders

Author

Kralev, Velin, Kraleva, Radoslava, Botseva, Daniela, and Kostadinova, Dafina

Subjects
differential diagnostics, logopedics, speech therapy, language competence
Abstract

The article discusses the speech of children with communicative disorders focusing from linguistic point of view on the number of the words they use that belong to the different parts of speech. The data are obtained from a project that aims at the development and approbation of a battery of tests that investigate the speech of children with disorders. As a result from this project, a software prototype that measures the frequency of words in children’s speech has been developed.

Published
2014

35. On model architecture for a children's speech recognition interactive dialog system

Author

Kraleva, Radoslava and Kralev, Velin

Subjects
FOS: Computer and information sciences, Sound (cs.SD), Computer Science - Computation and Language, Speech processing, Computer Science - Human-Computer Interaction, Architecture model of spoken system, Speech recognition, Computation and Language (cs.CL), Computer Science - Sound, Human-Computer Interaction (cs.HC), Children’s speech recognition
Abstract

This report presents a general model of the architecture of information systems for the speech recognition of children. It presents a model of the speech data stream and how it works. The result of these studies and presented veins architectural model shows that research needs to be focused on acoustic-phonetic modeling in order to improve the quality of children's speech recognition and the sustainability of the systems to noise and changes in transmission environment. Another important aspect is the development of more accurate algorithms for modeling of spontaneous child speech., Comment: 6 pages, 2 figures, in proc. of conference FMNS 2009, Blagoevgrad, Bulgaria

Published
2009

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