Georgieva P.V.,Burgas Free University |
Popchev I.P.,Bulgarian Academy of Science |
Stoyanov S.N.,Plovdiv University
Cybernetics and Information Technologies | Year: 2015
Portfolio management is a process involving decision making in dynamic and unpredictable environment. Asset allocation plays a key role in this process, since the optimal use of the capital is a complex and resource-consuming problem. During our research in this field we have detected some problems that lead to biased results and one of them occurs in case of limited financial resources. In this paper a mathematical assessment of the dependence of the capital, used on asset prices is derived, and a multi-step procedure for asset allocation, aiming at optimization of the investor's utility in case of limited resources is described. The procedure is implemented as a module in a decision support system based on fuzzy logic. The paper contains comparison of the obtained test results with results from the classical Markowitz portfolio model. The conducted tests are on real data from the Bulgarian stock exchange.
Orozova D.,Burgas Free University |
Sotirova E.,University Professor Dr. Assen Zlatarov Burgas
2014 18th International Symposium on Electrical Apparatus and Technologies, SIELA 2014 - Proceedings | Year: 2014
A theoretical generalized net model is proposed that describes the organization of e-learning in various subjects. Techniques for selection of an appropriate form of intervention are presented, as well as choice of alternative strategies during the training process. There are introduced criteria for assessment of the effectiveness of the learning management system with respect to the predefined training topics using intuitionistic fuzzy sets. © 2014 IEEE.
Lazarov A.,Burgas Free University |
Kabakchiev H.,Sofia University |
Kostadinov T.,University Professor Dr. Assen Zlatarov Burgas
Proceedings International Radar Symposium | Year: 2014
Bistatic Inverse Forward Scattering Inverse Synthetic Aperture Radar (BFISAR) concept with Digital Video Broadcast-Terrestrial (DVB-T) waveform is discussed. Geometry of BFISAR topology with stationary transmitter, receiver and kinematic of a moving target are described by vector equations. Mathematical model of BFISAR signal based on DVB-T waveform is described. Image reconstruction is applied by Fourier transform for range compression and Fourier transform for azimuth compression. Numerical experiment to verify mathematical models derived is carried out. © 2014 Warsaw University of Technology (WUT).
Georgieva P.,Burgas Free University |
Popchev I.,Bulgarian Academy of Science
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2013
There is a variety of models for portfolio selection. However, in portfolio theory applications little or no attention is paid to the cardinality problem. In this paper, an algorithm for dealing with this problem is presented. The proposed allocation algorithm is implemented in a software system, which is based on the Fuzzy Logic Q-measure Model and manages financial investments in real time. Tests on real data from Bulgarian Stock Exchange are presented as illustration to the solution. © 2013 Springer-Verlag Berlin Heidelberg.
Agency: Cordis | Branch: FP7 | Program: CSA-SA | Phase: FP7-PEOPLE-2011-NIGHT | Award Amount: 115.50K | Year: 2011
The project concept is based on results of previous public opinion surveys, and the wish of people Researchers Night to become a regular event in their city, where they can interact with researchers and entertain. The main goal is to enhance public recognition of researchers and their role in society and economy, to encourage young people in Bulgaria to embark on scientific career. Main objectives: -disclose talents and hidden sides of life and work of researchers, and change existing stereotypes about researchers and their profession -raise awareness on the central role of researchers and their contributions to economy and society -highlight EU emphasis on researchers and opportunities for them in the large European labour market -make science and research career attractive for young people, and especially women The target audience will be, first, young people children, teen-agers, students, and second, their parents and the public at large, including industrial and non-governmental organisations. The activities will take place in largest Bulgarian cities Sofia, Varna, Plovdiv, Rousse, Burgas and Stara Zagora, where researchers will meet people in universities, Cabinets of Curiosity, scientific cafs, Knowledge Transfer Kiosks, Innovation Fair, amuse them with verses, music life performances, experiments. European corner will inform about Marie Curie, Ernest Rutherford, EURAXESS, activities of FP7 People programme, success stories. The Communications strategy will convey two important messages: European Researchers discover the micro world and Research is a passion for a whole life. It will also look for synergy with the International Year of Chemistry, 100 anniversary of Nobel prize of Maria Curie and creation of atom model by Ruddurford, and contributions of women to science. Consortium capacity is shown already at previous Researchers Nights, and within partners collaboration in supporting researchers career, mobility and innovation.