Preface

Abstract

8th International Scientific Conference “TechSys 2019” – Engineering, Technologies and Systems is organized by Technical University of Sofia, Plovdiv Branch. It was held on 16-18 May 2019 in Plovdiv, Bulgaria. The main goal of TechSys is to bring together researchers from academia and industry, scientists and experts in the field of engineering and technologies for sharing the ideas and innovations. Selected articles that represent the significant results of the conference have been collected to publish in this volume.The conference is organized under the frame of “Science Days of Technical University of Sofia” and supported by the Scientific and Research Sector.We would like to thank all the authors who have trusted the conference. To thank all those researchers who recognized the TechSys as an appropriate forum to share their recent developments and to get the new trends in the field of technical sciences and engineering.We must also thank all the reviewers and topic editors for their quiet but very important work, which ensured high quality of scientific research.Thanks to the plenary speakers Prof. Zezulka and Prof. Bradac for valuable presentation.Last but not least, we sincerely thank the whole team involved in organizing the TechSys 2019 conference.Editors: Prof. Valyo Nikolov and Assoc. Prof. Nikola Shakev