Radiocommunications and Videotechnologies Department

Proceedings of Papers of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST)

2021, 16-18 June, Sozopol, Bulgaria (Hybrid conference)

2021, ISBN online: 978-1-6654-2887-3 / ISBN CD-ROM: 978-1-6654-2886-6 / ISBN print on demand: 978-1-6654-2888-0 / Official web-site

Editors: Assoc. Prof. Dr. Kalin Dimitrov, Prof. Dr. Nebojša Donćov, Prof. Dr. Mitko Kostov

Technical support: Assoc. Prof. Dr. Ivo Draganov

Published by: Institute of Electrical and Electronics Engineers (IEEE)
Faculty of Telecommunications, Technical University of Sofia, Sofia, Bulgaria

CONTENTS

COMPUTER SYSTEMS, INTERNET TECHNOLOGIES, DIGITAL SIGNAL AND IMAGE PROCESSING I

• Janković, Р., I. Mihajlović, A. Amelio, I. R. Draganov, Predicting the Ecological Footprint: A Case Study for Italy, Pakistan and China, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 3-10, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Mitev, Y. R., D. I. Dimitrov, IT Service Management Challenges in Condition of Pandemic and Post-Pandemic Environment, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 11-14, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Georgiev, G. N., O. B. Panagiev, Unsubscribe rate of chatbots users received broadcast messages for France, Germany, Russia and the Global market, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 15-18, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Vladimirov, I., D. Nikolova, Z. Terneva, Overview of Methods for 3D Reconstruction of Human Models with Applications in Fashion E-Commerce, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 19-22, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Nikolova, D., I. Vladimirov, Z. Terneva, Human Action Recognition for Pose-based Attention: Methods on the Framework of Image Processing and Deep Learning, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 23-26, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Christoff, N., Improving a Digital Elevation Model of Mars Based on Principal Curvature Directions, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 27-30, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Mironov, R. P., I. R. Draganov, Local Adaptive LMS Filtration of Multidimensional Images, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 31-34, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.

COMPUTER SYSTEMS, INTERNET TECHNOLOGIES, DIGITAL SIGNAL AND IMAGE PROCESSING II

• Dimitrova, E., D. Dimitrova, V. Dimitrov, V. Trifonov, Contemporary Authentication Access Approach for High Security Information Systems, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 37-40, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Nikolov, N., O. Nakov, D. Gotseva, Operating Systems for IoT Devices, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 41-44, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Nikolov, N., O. Nakov, D. Gotseva, Research of MQTT versus LwM2M IoT communication protocols for IoT, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 45-48, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Yosifova, V. H., D. S. Chikurtev, Communication system for remote control of infrared heating, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 49-52, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Kirilov, N. K., E. K. Kirilova, Classifying Dual-Energy X-ray Absorptiometry Images Using Machine Learning, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 53-54, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Kurochka, K. S., K. A. Panarin, An algorithm of segmentation of a human spine X-ray image with the help of Mask R-CNN neural network for the purpose of vertebrae localization, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 55-58, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Terneva, Z., I. Vladimirov, D. Nikolova, Accessing LinkedIn and Google E-mail Databases Using Kali Linux and TheHarvester, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 59-62, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.

DIGITAL SIGNAL AND IMAGE PROCESSING III

• Stošić, B. P., Improved Classes of CIC Filter Functions: Design and Analysis of the Quantized-Coefficient Errors, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 65-68, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Kostić, I., G. Stančić, S. Cvetković, Sensitivity of notch filters realized by parallel connection of allpass subfilters, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 69-72, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Ivaylov, I., M. Lazarova, A. Manolova, Multimodal Motor Imagery BCI Based on EEG and NIRS, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 73-76, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Ziani, D., S. M. Meriah, F. Derraz, L. Merad, A planar MIMO UWB array design for high-resolution microwave imaging, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 77-80, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Pavlova, M. T., A Comparison of the Accuracies of a Convolution Neural Network Built on Different Types of Convolution Layers, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 81-84, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Georgieva, V. M., P. P. Petrov, D. S. Tsvetkova, L. B. Laskov, MRI/SPECT Image Fusion of Brain Based on Multi-Scale Wavelet Decomposition, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 85-88, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Draganov, I. R., R. P. Mironov, 3D SUSAN Filtering of CT Images With Adaptive Selection of the Brightness Threshold, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 89-92, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.

INFORMATICS, COMPUTER SCIENCE, ELECTRONICS, CONTROL SYSTEMS, DIGITAL SIGNAL AND IMAGE PROCESSING IV

• Iliev, D., N. Madzharov, R. Ilarionov, Methods to Increase Distance in Wireless Power Transfer Systems, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 95-98, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Kireva-Mihova, D. P., K. Mirchev, B. Boyadjiev, Authorization Concept in the 4th Railway Package, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 99-102, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Brusev, T., Buck-Boost DC-DC Converter Designed for PCB Applications, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 103-106, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Rusev, R. P., G. V. Angelov, B. R. Tzaneva, M. P. Aleksandrova, Electrophoretic Deposition of Rochelle Salt on Cu2O Plate, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 107-110, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Kolev, S., Designing a NFC system, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 111-113, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Miletiev, R., E. Iontchev, R. Yordanov, Design of navigation system with multiband GNSS receiver with RTK and DR algorithms, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 115-117, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Genchev, P. G., Analysis of changes in the probability of an incident with information security, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 119-122, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Rogan, I. D., O. R. Pronić-Rančić, Forecasting the volume of postal services using Savitzky-Golay filter modification, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 123-126, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Sheiretsky, K. G., S. Antonov, Criteria for the Existence of a Sustainable Limit Cycle. Application of the Criteria in the First Approximation for the Van der Pol Equation, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 127-129, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Angelevska, B., I. Andreevski, V. Atanasova, Crowd-sourcing: Citizens as scientists for air pollution monitoring, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 131-134, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.

ANTENNAS I AND CONTROL SYSTEMS

• Nachev, I., I. Iliev, Improving an antenna radiation pattern using photonic band gap structure, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 137-140, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Arslan, İ. A., G. Altin, A Novel Deep Neural Network Based Antenna Selection Architecture for Spatial Modulation Systems, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 141-144, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Marinković, Z., G. Gugliandolo, G. Campobello, G. Crupi, N. Donato, Application of Artificial Neural Networks for Modeling of the Frequency-Dependent Performance of Surface Acoustic Wave Resonators, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 145-148, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Petkova, D. B., P. Z. Petkov, Aperture-Coupled Microstrip Patch Antenna Design Using FEM Simulation Technique, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 149-152, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Mladenov, G., I. Damyanov, T. Valkovski, Research and selection of parameters determining the efficiency of the braking system of cars to improve traffic safety and environmental performance, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 153-156, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.

RADIO COMMUNICATIONS, MICROWAVES, ANTENNAS II

• Kumar, V., H. Singh, K. Saxena, B. Bonev, R. Prasad, Approximations for ITV Rain Model Using Machine Learning, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 159-162, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Singh, H., V. Kumar, K. Saxena, B. Bonev, R. Prasad, Prediction of Radio Wave Attenuation due to Cloud Using Machine Learning Techniques, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 163-166, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Stojanović, M., N. Sekulović, A. Panajotović, P. Popović, M. Protić, Wireless channel prediction using ensemble of Extreme Learning Machines, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 167-170, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Lubich, L., I. N. Dochev, L. E. Docheva, S. V. Manev, Development and Study of a Small Radar, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 171-174, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Panagiev, O. B., Investigation of the interference in signal transfer between different cable operators in CATV/HFC interlaced cable distribution networks, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 175-178, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.

ENGINEERING EDUCATION, ENERGY SYSTEMS AND EFFICIENCY I

• Atanasovski, M., M. Kostov, B. Arapinoski, M. Spirovski, Integration of New RES in Power System of North Macedonia, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 181-184, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Anackovski, F., M. Kostov, R. Pasic, I. Kuzmanov, The Impact of Industry 4.0 on Education and Future Jobs, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 185-188, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Popovski, P., G. Veljanovski, B. Arapinovski, M. Atanasovski, Electomagnetic Analysis of Synchronous Generator, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 189-192, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Sterjovski, I., N. Acevski, M. Spirovski, Application of Matlab Tool for Analysis of Complex Grounding Systems of Overhead Power Lines, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 193-196, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Gade, S., R. Agrawal, D. Patil, S. Antonov, Optimal Utilization of UPQC at Different Operating Condition Using TLBO, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 197-200, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Valkovski, T., K. Dimitrov, Reception of audio signals received from different LEDs used in the low cost LI-FI systems, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 201-204, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Terziev, V., T. Valkovski, K. Dimitrov, I. Damyanov, Monitoring of disk brakes vs drum brakes using infrared thermography, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 205-208, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.

ENGINEERING EDUCATION, ENERGY SYSTEMS AND EFFICIENCY II

• Yordanova, M. Y., An Approach to Application of the Event Tree Analysis for Electrical Safety Risk Assessment, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 211-214, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Yordanova, M. Y., Application of the Situational Teaching Method in the Electrical Safety Education, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 215-216, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Sheiretsky, K. G., S. Antonov, Formal Method for Finding Asymptotic Approximations, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 217-219, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Vasileva, M., Using simulation modeling to study overvoltages in the electrical networks, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 221-222, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Laskov, L. B., V. M. Georgieva, Analysis of Amplitude Modulation and Demodulation in MATLAB Simulink Environment, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 223-226, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Mehmed-Hamza, M. E., A. B. Filipov, M. D. Ivanova, Research and Analysis of Faults in Medium Voltage Distribution Grids, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 227-230, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Parushev, P. V., Study of Hydrogen Production by Electrolysis of Spring Waters From Bulgaria, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 231-234, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Kalinkov, K., V. Markova, T. Ganchev, The Effect of Acute Stress on the Performance of Students in Engineering Education, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 235-238, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.
• Trushev, I., S. Schati, D. Patil, On the Minimal Fire Power for Heat Detection, In Proc. of the 2021 56th International Scientific Conference on Information, Communication and Energy Systems and Technologies (ICEST), Sozopol, Bulgaria, IEEE, June 16-18, 2021, pp. 239-242, ISBN online: 978-1-6654-2887-3, ISBN CD-ROM: 978-1-6654-2886-6, ISBN print on demand: 978-1-6654-2888-0.